-/* $Id: s_texture.c,v 1.73 2002/10/24 23:57:24 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 4.1
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 2011 VMware, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-#include "glheader.h"
-#include "context.h"
-#include "colormac.h"
-#include "macros.h"
-#include "mmath.h"
-#include "imports.h"
-#include "texformat.h"
-#include "teximage.h"
-
-#include "s_context.h"
-#include "s_texture.h"
-
-
-/*
- * These values are used in the fixed-point arithmetic used
- * for linear filtering.
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
*/
-#define WEIGHT_SCALE 65536.0F
-#define WEIGHT_SHIFT 16
-
-/*
- * Used to compute texel locations for linear sampling.
- * Input:
- * wrapMode = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER_ARB
- * S = texcoord in [0,1]
- * SIZE = width (or height or depth) of texture
- * Output:
- * U = texcoord in [0, width]
- * I0, I1 = two nearest texel indexes
- */
-#define COMPUTE_LINEAR_TEXEL_LOCATIONS(wrapMode, S, U, SIZE, I0, I1) \
-{ \
- if (wrapMode == GL_REPEAT) { \
- U = S * SIZE - 0.5F; \
- I0 = IFLOOR(U) & (SIZE - 1); \
- I1 = (I0 + 1) & (SIZE - 1); \
- } \
- else if (wrapMode == GL_CLAMP_TO_EDGE) { \
- if (S <= 0.0F) \
- U = 0.0F; \
- else if (S >= 1.0F) \
- U = (GLfloat) SIZE; \
- else \
- U = S * SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- if (I0 < 0) \
- I0 = 0; \
- if (I1 >= (GLint) SIZE) \
- I1 = SIZE - 1; \
- } \
- else if (wrapMode == GL_CLAMP_TO_BORDER_ARB) { \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- if (S <= min) \
- U = min * SIZE; \
- else if (S >= max) \
- U = max * SIZE; \
- else \
- U = S * SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- } \
- else if (wrapMode == GL_MIRRORED_REPEAT_ARB) { \
- const GLint flr = IFLOOR(S); \
- if (flr & 1) \
- U = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
- else \
- U = S - (GLfloat) flr; /* flr is even */ \
- U = (U * SIZE) - 0.5; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- if (I0 < 0) \
- I0 = 0; \
- if (I1 >= (GLint) SIZE) \
- I1 = SIZE - 1; \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_ATI) { \
- U = fabs(S); \
- if (U >= 1.0F) \
- U = (GLfloat) SIZE; \
- else \
- U *= SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_TO_EDGE_ATI) { \
- U = fabs(S); \
- if (U >= 1.0F) \
- U = (GLfloat) SIZE; \
- else \
- U *= SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- if (I0 < 0) \
- I0 = 0; \
- if (I1 >= (GLint) SIZE) \
- I1 = SIZE - 1; \
- } \
- else { \
- ASSERT(wrapMode == GL_CLAMP); \
- if (S <= 0.0F) \
- U = 0.0F; \
- else if (S >= 1.0F) \
- U = (GLfloat) SIZE; \
- else \
- U = S * SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- } \
-}
-
-
-/*
- * Used to compute texel location for nearest sampling.
+/**
+ * Functions for mapping/unmapping texture images.
*/
-#define COMPUTE_NEAREST_TEXEL_LOCATION(wrapMode, S, SIZE, I) \
-{ \
- if (wrapMode == GL_REPEAT) { \
- /* s limited to [0,1) */ \
- /* i limited to [0,size-1] */ \
- I = IFLOOR(S * SIZE); \
- I &= (SIZE - 1); \
- } \
- else if (wrapMode == GL_CLAMP_TO_EDGE) { \
- /* s limited to [min,max] */ \
- /* i limited to [0, size-1] */ \
- const GLfloat min = 1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- if (S < min) \
- I = 0; \
- else if (S > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(S * SIZE); \
- } \
- else if (wrapMode == GL_CLAMP_TO_BORDER_ARB) { \
- /* s limited to [min,max] */ \
- /* i limited to [-1, size] */ \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- if (S <= min) \
- I = -1; \
- else if (S >= max) \
- I = SIZE; \
- else \
- I = IFLOOR(S * SIZE); \
- } \
- else if (wrapMode == GL_MIRRORED_REPEAT_ARB) { \
- const GLfloat min = 1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- const GLint flr = IFLOOR(S); \
- GLfloat u; \
- if (flr & 1) \
- u = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
- else \
- u = S - (GLfloat) flr; /* flr is even */ \
- if (u < min) \
- I = 0; \
- else if (u > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_ATI) { \
- /* s limited to [0,1] */ \
- /* i limited to [0,size-1] */ \
- const GLfloat u = fabs(S); \
- if (u <= 0.0F) \
- I = 0; \
- else if (u >= 1.0F) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_TO_EDGE_ATI) { \
- /* s limited to [min,max] */ \
- /* i limited to [0, size-1] */ \
- const GLfloat min = 1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- const GLfloat u = fabs(S); \
- if (u < min) \
- I = 0; \
- else if (u > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else { \
- ASSERT(wrapMode == GL_CLAMP); \
- /* s limited to [0,1] */ \
- /* i limited to [0,size-1] */ \
- if (S <= 0.0F) \
- I = 0; \
- else if (S >= 1.0F) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(S * SIZE); \
- } \
-}
-#define COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(S, U, SIZE, I0, I1) \
-{ \
- U = S * SIZE - 0.5F; \
- I0 = IFLOOR(U) & (SIZE - 1); \
- I1 = (I0 + 1) & (SIZE - 1); \
-}
+#include "main/context.h"
+#include "main/fbobject.h"
+#include "main/teximage.h"
+#include "main/texobj.h"
+#include "util/u_memory.h"
+#include "swrast/swrast.h"
+#include "swrast/s_context.h"
-/*
- * Compute linear mipmap levels for given lambda.
+/**
+ * Allocate a new swrast_texture_image (a subclass of gl_texture_image).
+ * Called via ctx->Driver.NewTextureImage().
*/
-#define COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level) \
-{ \
- if (lambda < 0.0F) \
- level = tObj->BaseLevel; \
- else if (lambda > tObj->_MaxLambda) \
- level = (GLint) (tObj->BaseLevel + tObj->_MaxLambda); \
- else \
- level = (GLint) (tObj->BaseLevel + lambda); \
+struct gl_texture_image *
+_swrast_new_texture_image( struct gl_context *ctx )
+{
+ (void) ctx;
+ return (struct gl_texture_image *) CALLOC_STRUCT(swrast_texture_image);
}
-/*
- * Compute nearest mipmap level for given lambda.
+/**
+ * Free a swrast_texture_image (a subclass of gl_texture_image).
+ * Called via ctx->Driver.DeleteTextureImage().
*/
-#define COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level) \
-{ \
- GLfloat l; \
- if (lambda <= 0.5F) \
- l = 0.0F; \
- else if (lambda > tObj->_MaxLambda + 0.4999F) \
- l = tObj->_MaxLambda + 0.4999F; \
- else \
- l = lambda; \
- level = (GLint) (tObj->BaseLevel + l + 0.5F); \
- if (level > tObj->_MaxLevel) \
- level = tObj->_MaxLevel; \
+void
+_swrast_delete_texture_image(struct gl_context *ctx,
+ struct gl_texture_image *texImage)
+{
+ /* Nothing special for the subclass yet */
+ _mesa_delete_texture_image(ctx, texImage);
}
-
-
-/*
- * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
- * see 1-pixel bands of improperly weighted linear-sampled texels. The
- * tests/texwrap.c demo is a good test.
- * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
- * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
- */
-#define FRAC(f) ((f) - IFLOOR(f))
-
-
-
-/*
- * Bitflags for texture border color sampling.
- */
-#define I0BIT 1
-#define I1BIT 2
-#define J0BIT 4
-#define J1BIT 8
-#define K0BIT 16
-#define K1BIT 32
-
-
-
-/*
- * Get texture palette entry.
- */
-static void
-palette_sample(const GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLint index, GLchan rgba[4] )
+static unsigned int
+texture_slices(const struct gl_texture_image *texImage)
{
- const GLchan *palette;
- GLenum format;
-
- if (ctx->Texture.SharedPalette) {
- ASSERT(!ctx->Texture.Palette.FloatTable);
- palette = (const GLchan *) ctx->Texture.Palette.Table;
- format = ctx->Texture.Palette.Format;
- }
- else {
- ASSERT(!tObj->Palette.FloatTable);
- palette = (const GLchan *) tObj->Palette.Table;
- format = tObj->Palette.Format;
- }
-
- switch (format) {
- case GL_ALPHA:
- rgba[ACOMP] = palette[index];
- return;
- case GL_LUMINANCE:
- case GL_INTENSITY:
- rgba[RCOMP] = palette[index];
- return;
- case GL_LUMINANCE_ALPHA:
- rgba[RCOMP] = palette[(index << 1) + 0];
- rgba[ACOMP] = palette[(index << 1) + 1];
- return;
- case GL_RGB:
- rgba[RCOMP] = palette[index * 3 + 0];
- rgba[GCOMP] = palette[index * 3 + 1];
- rgba[BCOMP] = palette[index * 3 + 2];
- return;
- case GL_RGBA:
- rgba[RCOMP] = palette[(index << 2) + 0];
- rgba[GCOMP] = palette[(index << 2) + 1];
- rgba[BCOMP] = palette[(index << 2) + 2];
- rgba[ACOMP] = palette[(index << 2) + 3];
- return;
- default:
- _mesa_problem(ctx, "Bad palette format in palette_sample");
- }
+ if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY)
+ return texImage->Height;
+ else
+ return texImage->Depth;
}
-
-/*
- * The lambda[] array values are always monotonic. Either the whole span
- * will be minified, magnified, or split between the two. This function
- * determines the subranges in [0, n-1] that are to be minified or magnified.
- */
-static INLINE void
-compute_min_mag_ranges( GLfloat minMagThresh, GLuint n, const GLfloat lambda[],
- GLuint *minStart, GLuint *minEnd,
- GLuint *magStart, GLuint *magEnd )
+unsigned int
+_swrast_teximage_slice_height(struct gl_texture_image *texImage)
{
- ASSERT(lambda != NULL);
-#if 0
- /* Verify that lambda[] is monotonous.
- * We can't really use this because the inaccuracy in the LOG2 function
- * causes this test to fail, yet the resulting texturing is correct.
- */
- if (n > 1) {
- GLuint i;
- printf("lambda delta = %g\n", lambda[0] - lambda[n-1]);
- if (lambda[0] >= lambda[n-1]) { /* decreasing */
- for (i = 0; i < n - 1; i++) {
- ASSERT((GLint) (lambda[i] * 10) >= (GLint) (lambda[i+1] * 10));
- }
- }
- else { /* increasing */
- for (i = 0; i < n - 1; i++) {
- ASSERT((GLint) (lambda[i] * 10) <= (GLint) (lambda[i+1] * 10));
- }
- }
- }
-#endif /* DEBUG */
-
- /* since lambda is monotonous-array use this check first */
- if (lambda[0] <= minMagThresh && lambda[n-1] <= minMagThresh) {
- /* magnification for whole span */
- *magStart = 0;
- *magEnd = n;
- *minStart = *minEnd = 0;
- }
- else if (lambda[0] > minMagThresh && lambda[n-1] > minMagThresh) {
- /* minification for whole span */
- *minStart = 0;
- *minEnd = n;
- *magStart = *magEnd = 0;
- }
- else {
- /* a mix of minification and magnification */
- GLuint i;
- if (lambda[0] > minMagThresh) {
- /* start with minification */
- for (i = 1; i < n; i++) {
- if (lambda[i] <= minMagThresh)
- break;
- }
- *minStart = 0;
- *minEnd = i;
- *magStart = i;
- *magEnd = n;
- }
- else {
- /* start with magnification */
- for (i = 1; i < n; i++) {
- if (lambda[i] > minMagThresh)
- break;
- }
- *magStart = 0;
- *magEnd = i;
- *minStart = i;
- *minEnd = n;
- }
- }
-
-#if 0
- /* Verify the min/mag Start/End values
- * We don't use this either (see above)
+ /* For 1D array textures, the slices are all 1 pixel high, and Height is
+ * the number of slices.
*/
- {
- GLint i;
- for (i = 0; i < n; i++) {
- if (lambda[i] > minMagThresh) {
- /* minification */
- ASSERT(i >= *minStart);
- ASSERT(i < *minEnd);
- }
- else {
- /* magnification */
- ASSERT(i >= *magStart);
- ASSERT(i < *magEnd);
- }
- }
- }
-#endif
+ if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY)
+ return 1;
+ else
+ return texImage->Height;
}
-
-/**********************************************************************/
-/* 1-D Texture Sampling Functions */
-/**********************************************************************/
-
-/*
- * Return the texture sample for coordinate (s) using GL_NEAREST filter.
+/**
+ * Called via ctx->Driver.AllocTextureImageBuffer()
*/
-static void
-sample_1d_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4], GLchan rgba[4])
+GLboolean
+_swrast_alloc_texture_image_buffer(struct gl_context *ctx,
+ struct gl_texture_image *texImage)
{
- const GLint width = img->Width2; /* without border, power of two */
- GLint i;
+ struct swrast_texture_image *swImg = swrast_texture_image(texImage);
+ GLuint bytesPerSlice;
+ GLuint slices = texture_slices(texImage);
+ GLuint i;
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
+ if (!_swrast_init_texture_image(texImage))
+ return GL_FALSE;
- /* skip over the border, if any */
- i += img->Border;
+ bytesPerSlice = _mesa_format_image_size(texImage->TexFormat, texImage->Width,
+ _swrast_teximage_slice_height(texImage), 1);
- if (i < 0 || i >= (GLint) img->Width) {
- /* Need this test for GL_CLAMP_TO_BORDER_ARB mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i, 0, 0, (GLvoid *) rgba);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, rgba[0], rgba);
- }
+ assert(!swImg->Buffer);
+ swImg->Buffer = _mesa_align_malloc(bytesPerSlice * slices, 512);
+ if (!swImg->Buffer)
+ return GL_FALSE;
+
+ /* RowStride and ImageSlices[] describe how to address texels in 'Data' */
+ swImg->RowStride = _mesa_format_row_stride(texImage->TexFormat,
+ texImage->Width);
+
+ for (i = 0; i < slices; i++) {
+ swImg->ImageSlices[i] = swImg->Buffer + bytesPerSlice * i;
}
-}
+ return GL_TRUE;
+}
-/*
- * Return the texture sample for coordinate (s) using GL_LINEAR filter.
+/**
+ * Code that overrides ctx->Driver.AllocTextureImageBuffer may use this to
+ * initialize the fields of swrast_texture_image without allocating the image
+ * buffer or initializing RowStride or the contents of ImageSlices.
+ *
+ * Returns GL_TRUE on success, GL_FALSE on memory allocation failure.
*/
-static void
-sample_1d_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4], GLchan rgba[4])
+GLboolean
+_swrast_init_texture_image(struct gl_texture_image *texImage)
{
- const GLint width = img->Width2;
- GLint i0, i1;
- GLfloat u;
- GLuint useBorderColor;
+ struct swrast_texture_image *swImg = swrast_texture_image(texImage);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
+ if ((texImage->Width == 1 || util_is_power_of_two_or_zero(texImage->Width2)) &&
+ (texImage->Height == 1 || util_is_power_of_two_or_zero(texImage->Height2)) &&
+ (texImage->Depth == 1 || util_is_power_of_two_or_zero(texImage->Depth2)))
+ swImg->_IsPowerOfTwo = GL_TRUE;
+ else
+ swImg->_IsPowerOfTwo = GL_FALSE;
- useBorderColor = 0;
- if (img->Border) {
- i0 += img->Border;
- i1 += img->Border;
+ /* Compute Width/Height/DepthScale for mipmap lod computation */
+ if (texImage->TexObject->Target == GL_TEXTURE_RECTANGLE_NV) {
+ /* scale = 1.0 since texture coords directly map to texels */
+ swImg->WidthScale = 1.0;
+ swImg->HeightScale = 1.0;
+ swImg->DepthScale = 1.0;
}
else {
- if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
- if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
- }
-
- {
- const GLfloat a = FRAC(u);
-
-#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT
- const GLfloat w0 = (1.0F-a);
- const GLfloat w1 = a ;
-#else /* CHAN_BITS == 8 */
- /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */
- const GLint w0 = IROUND_POS((1.0F - a) * WEIGHT_SCALE);
- const GLint w1 = IROUND_POS( a * WEIGHT_SCALE);
-#endif
- GLchan t0[4], t1[4]; /* texels */
-
- if (useBorderColor & I0BIT) {
- COPY_CHAN4(t0, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, 0, 0, (GLvoid *) t0);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t0[0], t0);
- }
- }
- if (useBorderColor & I1BIT) {
- COPY_CHAN4(t1, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, 0, 0, (GLvoid *) t1);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t1[0], t1);
- }
- }
-
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = w0 * t0[0] + w1 * t1[0];
- rgba[1] = w0 * t0[1] + w1 * t1[1];
- rgba[2] = w0 * t0[2] + w1 * t1[2];
- rgba[3] = w0 * t0[3] + w1 * t1[3];
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (w0 * t0[0] + w1 * t1[0] + 0.5);
- rgba[1] = (GLchan) (w0 * t0[1] + w1 * t1[1] + 0.5);
- rgba[2] = (GLchan) (w0 * t0[2] + w1 * t1[2] + 0.5);
- rgba[3] = (GLchan) (w0 * t0[3] + w1 * t1[3] + 0.5);
-#else /* CHAN_BITS == 8 */
- rgba[0] = (GLchan) ((w0 * t0[0] + w1 * t1[0]) >> WEIGHT_SHIFT);
- rgba[1] = (GLchan) ((w0 * t0[1] + w1 * t1[1]) >> WEIGHT_SHIFT);
- rgba[2] = (GLchan) ((w0 * t0[2] + w1 * t1[2]) >> WEIGHT_SHIFT);
- rgba[3] = (GLchan) ((w0 * t0[3] + w1 * t1[3]) >> WEIGHT_SHIFT);
-#endif
-
- }
-}
-
-
-static void
-sample_1d_nearest_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- sample_1d_nearest(ctx, tObj, tObj->Image[level], texcoord[i], rgba[i]);
+ swImg->WidthScale = (GLfloat) texImage->Width;
+ swImg->HeightScale = (GLfloat) texImage->Height;
+ swImg->DepthScale = (GLfloat) texImage->Depth;
}
-}
+ assert(!swImg->ImageSlices);
+ swImg->ImageSlices = calloc(texture_slices(texImage), sizeof(void *));
+ if (!swImg->ImageSlices)
+ return GL_FALSE;
-static void
-sample_1d_linear_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- sample_1d_linear(ctx, tObj, tObj->Image[level], texcoord[i], rgba[i]);
- }
+ return GL_TRUE;
}
-
-/*
- * This is really just needed in order to prevent warnings with some compilers.
+/**
+ * Called via ctx->Driver.FreeTextureImageBuffer()
*/
-#if CHAN_TYPE == GL_FLOAT
-#define CHAN_CAST
-#else
-#define CHAN_CAST (GLchan) (GLint)
-#endif
-
-
-static void
-sample_1d_nearest_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+void
+_swrast_free_texture_image_buffer(struct gl_context *ctx,
+ struct gl_texture_image *texImage)
{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_1d_nearest(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4];
- const GLfloat f = FRAC(lambda[i]);
- sample_1d_nearest(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_1d_nearest(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
-
+ struct swrast_texture_image *swImage = swrast_texture_image(texImage);
+ _mesa_align_free(swImage->Buffer);
+ swImage->Buffer = NULL;
-static void
-sample_1d_linear_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_1d_linear(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4];
- const GLfloat f = FRAC(lambda[i]);
- sample_1d_linear(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_1d_linear(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
+ free(swImage->ImageSlices);
+ swImage->ImageSlices = NULL;
}
-
+/**
+ * Error checking for debugging only.
+ */
static void
-sample_nearest_1d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4] )
+check_map_teximage(const struct gl_texture_image *texImage,
+ GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h)
{
- GLuint i;
- struct gl_texture_image *image = tObj->Image[tObj->BaseLevel];
- (void) lambda;
- for (i=0;i<n;i++) {
- sample_1d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
- }
-}
+ if (texImage->TexObject->Target == GL_TEXTURE_1D)
+ assert(y == 0 && h == 1);
-
-static void
-sample_linear_1d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4] )
-{
- GLuint i;
- struct gl_texture_image *image = tObj->Image[tObj->BaseLevel];
- (void) lambda;
- for (i=0;i<n;i++) {
- sample_1d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
- }
+ assert(x < texImage->Width || texImage->Width == 0);
+ assert(y < texImage->Height || texImage->Height == 0);
+ assert(x + w <= texImage->Width);
+ assert(y + h <= texImage->Height);
+ assert(slice < texture_slices(texImage));
}
-
-/*
- * Given an (s) texture coordinate and lambda (level of detail) value,
- * return a texture sample.
+/**
+ * Map a 2D slice of a texture image into user space.
+ * (x,y,w,h) defines a region of interest (ROI). Reading/writing texels
+ * outside of the ROI is undefined.
*
+ * \param texImage the texture image
+ * \param slice the 3D image slice or array texture slice
+ * \param x, y, w, h region of interest
+ * \param mode bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT
+ * \param mapOut returns start of mapping of region of interest
+ * \param rowStrideOut returns row stride (in bytes)
*/
-static void
-sample_lambda_1d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- GLuint minStart, minEnd; /* texels with minification */
- GLuint magStart, magEnd; /* texels with magnification */
- GLuint i;
-
- ASSERT(lambda != NULL);
- compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
- n, lambda, &minStart, &minEnd, &magStart, &magEnd);
-
- if (minStart < minEnd) {
- /* do the minified texels */
- const GLuint m = minEnd - minStart;
- switch (tObj->MinFilter) {
- case GL_NEAREST:
- for (i = minStart; i < minEnd; i++)
- sample_1d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- case GL_LINEAR:
- for (i = minStart; i < minEnd; i++)
- sample_1d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- case GL_NEAREST_MIPMAP_NEAREST:
- sample_1d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_NEAREST:
- sample_1d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_NEAREST_MIPMAP_LINEAR:
- sample_1d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_LINEAR:
- sample_1d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- default:
- _mesa_problem(ctx, "Bad min filter in sample_1d_texture");
- return;
- }
- }
-
- if (magStart < magEnd) {
- /* do the magnified texels */
- switch (tObj->MagFilter) {
- case GL_NEAREST:
- for (i = magStart; i < magEnd; i++)
- sample_1d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- case GL_LINEAR:
- for (i = magStart; i < magEnd; i++)
- sample_1d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- default:
- _mesa_problem(ctx, "Bad mag filter in sample_1d_texture");
- return;
- }
+void
+_swrast_map_teximage(struct gl_context *ctx,
+ struct gl_texture_image *texImage,
+ GLuint slice,
+ GLuint x, GLuint y, GLuint w, GLuint h,
+ GLbitfield mode,
+ GLubyte **mapOut,
+ GLint *rowStrideOut)
+{
+ struct swrast_texture_image *swImage = swrast_texture_image(texImage);
+ GLubyte *map;
+ GLint stride, texelSize;
+ GLuint bw, bh;
+
+ check_map_teximage(texImage, slice, x, y, w, h);
+
+ if (!swImage->Buffer) {
+ /* Either glTexImage was called with a NULL <pixels> argument or
+ * we ran out of memory when allocating texture memory,
+ */
+ *mapOut = NULL;
+ *rowStrideOut = 0;
+ return;
}
-}
-
-/**********************************************************************/
-/* 2-D Texture Sampling Functions */
-/**********************************************************************/
+ texelSize = _mesa_get_format_bytes(texImage->TexFormat);
+ stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
+ _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
+ assert(x % bw == 0);
+ assert(y % bh == 0);
-/*
- * Return the texture sample for coordinate (s,t) using GL_NEAREST filter.
- */
-static INLINE void
-sample_2d_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4],
- GLchan rgba[])
-{
- const GLint width = img->Width2; /* without border, power of two */
- const GLint height = img->Height2; /* without border, power of two */
- GLint i, j;
+ /* This function can only be used with a swrast-allocated buffer, in which
+ * case ImageSlices is populated with pointers into Buffer.
+ */
+ assert(swImage->Buffer);
+ assert(swImage->Buffer == swImage->ImageSlices[0]);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoord[1], height, j);
+ map = swImage->ImageSlices[slice];
- /* skip over the border, if any */
- i += img->Border;
- j += img->Border;
+ /* apply x/y offset to map address */
+ map += stride * (y / bh) + texelSize * (x / bw);
- if (i < 0 || i >= (GLint) img->Width || j < 0 || j >= (GLint) img->Height) {
- /* Need this test for GL_CLAMP_TO_BORDER_ARB mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i, j, 0, (GLvoid *) rgba);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, rgba[0], rgba);
- }
- }
+ *mapOut = map;
+ *rowStrideOut = stride;
}
-
-
-/*
- * Return the texture sample for coordinate (s,t) using GL_LINEAR filter.
- * New sampling code contributed by Lynn Quam <quam@ai.sri.com>.
- */
-static INLINE void
-sample_2d_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4],
- GLchan rgba[])
+void
+_swrast_unmap_teximage(struct gl_context *ctx,
+ struct gl_texture_image *texImage,
+ GLuint slice)
{
- const GLint width = img->Width2;
- const GLint height = img->Height2;
- GLint i0, j0, i1, j1;
- GLuint useBorderColor;
- GLfloat u, v;
-
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoord[1], v, height, j0, j1);
-
- useBorderColor = 0;
- if (img->Border) {
- i0 += img->Border;
- i1 += img->Border;
- j0 += img->Border;
- j1 += img->Border;
- }
- else {
- if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
- if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
- if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
- if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
- }
-
- {
- const GLfloat a = FRAC(u);
- const GLfloat b = FRAC(v);
-
-#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT
- const GLfloat w00 = (1.0F-a) * (1.0F-b);
- const GLfloat w10 = a * (1.0F-b);
- const GLfloat w01 = (1.0F-a) * b ;
- const GLfloat w11 = a * b ;
-#else /* CHAN_BITS == 8 */
- /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */
- const GLint w00 = IROUND_POS((1.0F-a) * (1.0F-b) * WEIGHT_SCALE);
- const GLint w10 = IROUND_POS( a * (1.0F-b) * WEIGHT_SCALE);
- const GLint w01 = IROUND_POS((1.0F-a) * b * WEIGHT_SCALE);
- const GLint w11 = IROUND_POS( a * b * WEIGHT_SCALE);
-#endif
- GLchan t00[4];
- GLchan t10[4];
- GLchan t01[4];
- GLchan t11[4];
-
- if (useBorderColor & (I0BIT | J0BIT)) {
- COPY_CHAN4(t00, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, j0, 0, (GLvoid *) t00);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t00[0], t00);
- }
- }
- if (useBorderColor & (I1BIT | J0BIT)) {
- COPY_CHAN4(t10, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, j0, 0, (GLvoid *) t10);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t10[0], t10);
- }
- }
- if (useBorderColor & (I0BIT | J1BIT)) {
- COPY_CHAN4(t01, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, j1, 0, (GLvoid *) t01);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t01[0], t01);
- }
- }
- if (useBorderColor & (I1BIT | J1BIT)) {
- COPY_CHAN4(t11, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, j1, 0, (GLvoid *) t11);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t11[0], t11);
- }
- }
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0];
- rgba[1] = w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1];
- rgba[2] = w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2];
- rgba[3] = w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3];
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (w00 * t00[0] + w10 * t10[0] +
- w01 * t01[0] + w11 * t11[0] + 0.5);
- rgba[1] = (GLchan) (w00 * t00[1] + w10 * t10[1] +
- w01 * t01[1] + w11 * t11[1] + 0.5);
- rgba[2] = (GLchan) (w00 * t00[2] + w10 * t10[2] +
- w01 * t01[2] + w11 * t11[2] + 0.5);
- rgba[3] = (GLchan) (w00 * t00[3] + w10 * t10[3] +
- w01 * t01[3] + w11 * t11[3] + 0.5);
-#else /* CHAN_BITS == 8 */
- rgba[0] = (GLchan) ((w00 * t00[0] + w10 * t10[0] +
- w01 * t01[0] + w11 * t11[0]) >> WEIGHT_SHIFT);
- rgba[1] = (GLchan) ((w00 * t00[1] + w10 * t10[1] +
- w01 * t01[1] + w11 * t11[1]) >> WEIGHT_SHIFT);
- rgba[2] = (GLchan) ((w00 * t00[2] + w10 * t10[2] +
- w01 * t01[2] + w11 * t11[2]) >> WEIGHT_SHIFT);
- rgba[3] = (GLchan) ((w00 * t00[3] + w10 * t10[3] +
- w01 * t01[3] + w11 * t11[3]) >> WEIGHT_SHIFT);
-#endif
-
- }
-
+ /* nop */
}
-/*
- * As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT
- * and we're not using a paletted texture.
- */
-static INLINE void
-sample_2d_linear_repeat(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4],
- GLchan rgba[])
+void
+_swrast_map_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
{
- const GLint width = img->Width2;
- const GLint height = img->Height2;
- GLint i0, j0, i1, j1;
- GLfloat u, v;
-
- ASSERT(tObj->WrapS == GL_REPEAT);
- ASSERT(tObj->WrapT == GL_REPEAT);
- ASSERT(img->Border == 0);
- ASSERT(img->Format != GL_COLOR_INDEX);
-
- COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(texcoord[0], u, width, i0, i1);
- COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(texcoord[1], v, height, j0, j1);
-
- {
- const GLfloat a = FRAC(u);
- const GLfloat b = FRAC(v);
-
-#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT
- const GLfloat w00 = (1.0F-a) * (1.0F-b);
- const GLfloat w10 = a * (1.0F-b);
- const GLfloat w01 = (1.0F-a) * b ;
- const GLfloat w11 = a * b ;
-#else /* CHAN_BITS == 8 */
- /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */
- const GLint w00 = IROUND_POS((1.0F-a) * (1.0F-b) * WEIGHT_SCALE);
- const GLint w10 = IROUND_POS( a * (1.0F-b) * WEIGHT_SCALE);
- const GLint w01 = IROUND_POS((1.0F-a) * b * WEIGHT_SCALE);
- const GLint w11 = IROUND_POS( a * b * WEIGHT_SCALE);
-#endif
- GLchan t00[4];
- GLchan t10[4];
- GLchan t01[4];
- GLchan t11[4];
-
- (*img->FetchTexel)(img, i0, j0, 0, (GLvoid *) t00);
- (*img->FetchTexel)(img, i1, j0, 0, (GLvoid *) t10);
- (*img->FetchTexel)(img, i0, j1, 0, (GLvoid *) t01);
- (*img->FetchTexel)(img, i1, j1, 0, (GLvoid *) t11);
-
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0];
- rgba[1] = w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1];
- rgba[2] = w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2];
- rgba[3] = w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3];
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (w00 * t00[0] + w10 * t10[0] +
- w01 * t01[0] + w11 * t11[0] + 0.5);
- rgba[1] = (GLchan) (w00 * t00[1] + w10 * t10[1] +
- w01 * t01[1] + w11 * t11[1] + 0.5);
- rgba[2] = (GLchan) (w00 * t00[2] + w10 * t10[2] +
- w01 * t01[2] + w11 * t11[2] + 0.5);
- rgba[3] = (GLchan) (w00 * t00[3] + w10 * t10[3] +
- w01 * t01[3] + w11 * t11[3] + 0.5);
-#else /* CHAN_BITS == 8 */
- rgba[0] = (GLchan) ((w00 * t00[0] + w10 * t10[0] +
- w01 * t01[0] + w11 * t11[0]) >> WEIGHT_SHIFT);
- rgba[1] = (GLchan) ((w00 * t00[1] + w10 * t10[1] +
- w01 * t01[1] + w11 * t11[1]) >> WEIGHT_SHIFT);
- rgba[2] = (GLchan) ((w00 * t00[2] + w10 * t10[2] +
- w01 * t01[2] + w11 * t11[2]) >> WEIGHT_SHIFT);
- rgba[3] = (GLchan) ((w00 * t00[3] + w10 * t10[3] +
- w01 * t01[3] + w11 * t11[3]) >> WEIGHT_SHIFT);
-#endif
-
- }
-
-}
+ const GLuint faces = _mesa_num_tex_faces(texObj->Target);
+ GLuint face, level;
+ for (face = 0; face < faces; face++) {
+ for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
+ struct gl_texture_image *texImage = texObj->Image[face][level];
+ struct swrast_texture_image *swImage = swrast_texture_image(texImage);
+ unsigned int i, slices;
+ if (!texImage)
+ continue;
-static void
-sample_2d_nearest_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- sample_2d_nearest(ctx, tObj, tObj->Image[level], texcoord[i], rgba[i]);
- }
-}
+ /* In the case of a swrast-allocated texture buffer, the ImageSlices
+ * and RowStride are always available.
+ */
+ if (swImage->Buffer) {
+ assert(swImage->ImageSlices[0] == swImage->Buffer);
+ continue;
+ }
+ if (!swImage->ImageSlices) {
+ swImage->ImageSlices =
+ calloc(texture_slices(texImage), sizeof(void *));
+ if (!swImage->ImageSlices)
+ continue;
+ }
+ slices = texture_slices(texImage);
-static void
-sample_2d_linear_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- sample_2d_linear(ctx, tObj, tObj->Image[level], texcoord[i], rgba[i]);
- }
-}
+ for (i = 0; i < slices; i++) {
+ GLubyte *map;
+ GLint rowStride;
+ if (swImage->ImageSlices[i])
+ continue;
+ ctx->Driver.MapTextureImage(ctx, texImage, i,
+ 0, 0,
+ texImage->Width, texImage->Height,
+ GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
+ &map, &rowStride);
-static void
-sample_2d_nearest_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_2d_nearest(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4]; /* texels */
- const GLfloat f = FRAC(lambda[i]);
- sample_2d_nearest(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_2d_nearest(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ swImage->ImageSlices[i] = map;
+ /* A swrast-using driver has to return the same rowstride for
+ * every slice of the same texture, since we don't track them
+ * separately.
+ */
+ if (i == 0)
+ swImage->RowStride = rowStride;
+ else
+ assert(swImage->RowStride == rowStride);
+ }
}
}
}
-
-/* Trilinear filtering */
-static void
-sample_2d_linear_mipmap_linear( GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+void
+_swrast_unmap_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_2d_linear(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4]; /* texels */
- const GLfloat f = FRAC(lambda[i]);
- sample_2d_linear(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_2d_linear(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
-
+ const GLuint faces = _mesa_num_tex_faces(texObj->Target);
+ GLuint face, level;
-static void
-sample_2d_linear_mipmap_linear_repeat( GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- GLuint i;
- ASSERT(lambda != NULL);
- ASSERT(tObj->WrapS == GL_REPEAT);
- ASSERT(tObj->WrapT == GL_REPEAT);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_2d_linear_repeat(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4]; /* texels */
- const GLfloat f = FRAC(lambda[i]);
- sample_2d_linear_repeat(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_2d_linear_repeat(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
+ for (face = 0; face < faces; face++) {
+ for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
+ struct gl_texture_image *texImage = texObj->Image[face][level];
+ struct swrast_texture_image *swImage = swrast_texture_image(texImage);
+ unsigned int i, slices;
+ if (!texImage)
+ continue;
-static void
-sample_nearest_2d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- GLuint i;
- struct gl_texture_image *image = tObj->Image[tObj->BaseLevel];
- (void) lambda;
- for (i=0;i<n;i++) {
- sample_2d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
- }
-}
+ if (swImage->Buffer)
+ return;
+ if (!swImage->ImageSlices)
+ continue;
+ slices = texture_slices(texImage);
-static void
-sample_linear_2d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- GLuint i;
- struct gl_texture_image *image = tObj->Image[tObj->BaseLevel];
- (void) lambda;
- for (i=0;i<n;i++) {
- sample_2d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
+ for (i = 0; i < slices; i++) {
+ if (swImage->ImageSlices[i]) {
+ ctx->Driver.UnmapTextureImage(ctx, texImage, i);
+ swImage->ImageSlices[i] = NULL;
+ }
+ }
+ }
}
}
-/*
- * Optimized 2-D texture sampling:
- * S and T wrap mode == GL_REPEAT
- * GL_NEAREST min/mag filter
- * No border,
- * RowStride == Width,
- * Format = GL_RGB
+/**
+ * Map all textures for reading prior to software rendering.
*/
-static void
-opt_sample_rgb_2d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+void
+_swrast_map_textures(struct gl_context *ctx)
{
- const struct gl_texture_image *img = tObj->Image[tObj->BaseLevel];
- const GLfloat width = (GLfloat) img->Width;
- const GLfloat height = (GLfloat) img->Height;
- const GLint colMask = img->Width - 1;
- const GLint rowMask = img->Height - 1;
- const GLint shift = img->WidthLog2;
- GLuint k;
- (void) lambda;
- ASSERT(tObj->WrapS==GL_REPEAT);
- ASSERT(tObj->WrapT==GL_REPEAT);
- ASSERT(img->Border==0);
- ASSERT(img->Format==GL_RGB);
-
- for (k=0; k<n; k++) {
- GLint i = IFLOOR(texcoords[k][0] * width) & colMask;
- GLint j = IFLOOR(texcoords[k][1] * height) & rowMask;
- GLint pos = (j << shift) | i;
- GLchan *texel = ((GLchan *) img->Data) + 3*pos;
- rgba[k][RCOMP] = texel[0];
- rgba[k][GCOMP] = texel[1];
- rgba[k][BCOMP] = texel[2];
- }
-}
+ int unit;
+ for (unit = 0; unit <= ctx->Texture._MaxEnabledTexImageUnit; unit++) {
+ struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
-/*
- * Optimized 2-D texture sampling:
- * S and T wrap mode == GL_REPEAT
- * GL_NEAREST min/mag filter
- * No border
- * RowStride == Width,
- * Format = GL_RGBA
- */
-static void
-opt_sample_rgba_2d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- const struct gl_texture_image *img = tObj->Image[tObj->BaseLevel];
- const GLfloat width = (GLfloat) img->Width;
- const GLfloat height = (GLfloat) img->Height;
- const GLint colMask = img->Width - 1;
- const GLint rowMask = img->Height - 1;
- const GLint shift = img->WidthLog2;
- GLuint i;
- (void) lambda;
- ASSERT(tObj->WrapS==GL_REPEAT);
- ASSERT(tObj->WrapT==GL_REPEAT);
- ASSERT(img->Border==0);
- ASSERT(img->Format==GL_RGBA);
-
- for (i = 0; i < n; i++) {
- const GLint col = IFLOOR(texcoords[i][0] * width) & colMask;
- const GLint row = IFLOOR(texcoords[i][1] * height) & rowMask;
- const GLint pos = (row << shift) | col;
- const GLchan *texel = ((GLchan *) img->Data) + (pos << 2); /* pos*4 */
- COPY_CHAN4(rgba[i], texel);
+ if (texObj)
+ _swrast_map_texture(ctx, texObj);
}
}
-/*
- * Given an array of texture coordinate and lambda (level of detail)
- * values, return an array of texture sample.
+/**
+ * Unmap all textures for reading prior to software rendering.
*/
-static void
-sample_lambda_2d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+void
+_swrast_unmap_textures(struct gl_context *ctx)
{
- const struct gl_texture_image *tImg = tObj->Image[tObj->BaseLevel];
- GLuint minStart, minEnd; /* texels with minification */
- GLuint magStart, magEnd; /* texels with magnification */
-
- const GLboolean repeatNoBorder = (tObj->WrapS == GL_REPEAT)
- && (tObj->WrapT == GL_REPEAT)
- && (tImg->Border == 0 && (tImg->Width == tImg->RowStride))
- && (tImg->Format != GL_COLOR_INDEX);
-
- ASSERT(lambda != NULL);
- compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
- n, lambda, &minStart, &minEnd, &magStart, &magEnd);
-
- if (minStart < minEnd) {
- /* do the minified texels */
- const GLuint m = minEnd - minStart;
- switch (tObj->MinFilter) {
- case GL_NEAREST:
- if (repeatNoBorder) {
- switch (tImg->Format) {
- case GL_RGB:
- opt_sample_rgb_2d(ctx, texUnit, tObj, m, texcoords + minStart,
- NULL, rgba + minStart);
- break;
- case GL_RGBA:
- opt_sample_rgba_2d(ctx, texUnit, tObj, m, texcoords + minStart,
- NULL, rgba + minStart);
- break;
- default:
- sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + minStart,
- NULL, rgba + minStart );
- }
- }
- else {
- sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + minStart,
- NULL, rgba + minStart);
- }
- break;
- case GL_LINEAR:
- sample_linear_2d(ctx, texUnit, tObj, m, texcoords + minStart,
- NULL, rgba + minStart);
- break;
- case GL_NEAREST_MIPMAP_NEAREST:
- sample_2d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_NEAREST:
- sample_2d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_NEAREST_MIPMAP_LINEAR:
- sample_2d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_LINEAR:
- if (repeatNoBorder)
- sample_2d_linear_mipmap_linear_repeat(ctx, tObj, m,
- texcoords + minStart, lambda + minStart, rgba + minStart);
- else
- sample_2d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- default:
- _mesa_problem(ctx, "Bad min filter in sample_2d_texture");
- return;
- }
- }
-
- if (magStart < magEnd) {
- /* do the magnified texels */
- const GLuint m = magEnd - magStart;
-
- switch (tObj->MagFilter) {
- case GL_NEAREST:
- if (repeatNoBorder) {
- switch (tImg->Format) {
- case GL_RGB:
- opt_sample_rgb_2d(ctx, texUnit, tObj, m, texcoords + magStart,
- NULL, rgba + magStart);
- break;
- case GL_RGBA:
- opt_sample_rgba_2d(ctx, texUnit, tObj, m, texcoords + magStart,
- NULL, rgba + magStart);
- break;
- default:
- sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + magStart,
- NULL, rgba + magStart );
- }
- }
- else {
- sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + magStart,
- NULL, rgba + magStart);
- }
- break;
- case GL_LINEAR:
- sample_linear_2d(ctx, texUnit, tObj, m, texcoords + magStart,
- NULL, rgba + magStart);
- break;
- default:
- _mesa_problem(ctx, "Bad mag filter in sample_lambda_2d");
- }
- }
-}
-
-
-
-/**********************************************************************/
-/* 3-D Texture Sampling Functions */
-/**********************************************************************/
-
-/*
- * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
- */
-static void
-sample_3d_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4],
- GLchan rgba[4])
-{
- const GLint width = img->Width2; /* without border, power of two */
- const GLint height = img->Height2; /* without border, power of two */
- const GLint depth = img->Depth2; /* without border, power of two */
- GLint i, j, k;
-
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoord[1], height, j);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapR, texcoord[2], depth, k);
-
- if (i < 0 || i >= (GLint) img->Width ||
- j < 0 || j >= (GLint) img->Height ||
- k < 0 || k >= (GLint) img->Depth) {
- /* Need this test for GL_CLAMP_TO_BORDER_ARB mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i, j, k, (GLvoid *) rgba);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, rgba[0], rgba);
- }
- }
-}
-
-
-
-/*
- * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
- */
-static void
-sample_3d_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- const struct gl_texture_image *img,
- const GLfloat texcoord[4],
- GLchan rgba[4])
-{
- const GLint width = img->Width2;
- const GLint height = img->Height2;
- const GLint depth = img->Depth2;
- GLint i0, j0, k0, i1, j1, k1;
- GLuint useBorderColor;
- GLfloat u, v, w;
-
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoord[1], v, height, j0, j1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapR, texcoord[2], w, depth, k0, k1);
-
- useBorderColor = 0;
- if (img->Border) {
- i0 += img->Border;
- i1 += img->Border;
- j0 += img->Border;
- j1 += img->Border;
- k0 += img->Border;
- k1 += img->Border;
- }
- else {
- /* check if sampling texture border color */
- if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
- if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
- if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
- if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
- if (k0 < 0 || k0 >= depth) useBorderColor |= K0BIT;
- if (k1 < 0 || k1 >= depth) useBorderColor |= K1BIT;
- }
-
- {
- const GLfloat a = FRAC(u);
- const GLfloat b = FRAC(v);
- const GLfloat c = FRAC(w);
-
-#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT
- /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */
- GLfloat w000 = (1.0F-a) * (1.0F-b) * (1.0F-c);
- GLfloat w100 = a * (1.0F-b) * (1.0F-c);
- GLfloat w010 = (1.0F-a) * b * (1.0F-c);
- GLfloat w110 = a * b * (1.0F-c);
- GLfloat w001 = (1.0F-a) * (1.0F-b) * c ;
- GLfloat w101 = a * (1.0F-b) * c ;
- GLfloat w011 = (1.0F-a) * b * c ;
- GLfloat w111 = a * b * c ;
-#else /* CHAN_BITS == 8 */
- /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */
- GLint w000 = IROUND_POS((1.0F-a) * (1.0F-b) * (1.0F-c) * WEIGHT_SCALE);
- GLint w100 = IROUND_POS( a * (1.0F-b) * (1.0F-c) * WEIGHT_SCALE);
- GLint w010 = IROUND_POS((1.0F-a) * b * (1.0F-c) * WEIGHT_SCALE);
- GLint w110 = IROUND_POS( a * b * (1.0F-c) * WEIGHT_SCALE);
- GLint w001 = IROUND_POS((1.0F-a) * (1.0F-b) * c * WEIGHT_SCALE);
- GLint w101 = IROUND_POS( a * (1.0F-b) * c * WEIGHT_SCALE);
- GLint w011 = IROUND_POS((1.0F-a) * b * c * WEIGHT_SCALE);
- GLint w111 = IROUND_POS( a * b * c * WEIGHT_SCALE);
-#endif
-
- GLchan t000[4], t010[4], t001[4], t011[4];
- GLchan t100[4], t110[4], t101[4], t111[4];
-
- if (useBorderColor & (I0BIT | J0BIT | K0BIT)) {
- COPY_CHAN4(t000, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, j0, k0, (GLvoid *) t000);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t000[0], t000);
- }
- }
- if (useBorderColor & (I1BIT | J0BIT | K0BIT)) {
- COPY_CHAN4(t100, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, j0, k0, (GLvoid *) t100);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t100[0], t100);
- }
- }
- if (useBorderColor & (I0BIT | J1BIT | K0BIT)) {
- COPY_CHAN4(t010, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, j1, k0, (GLvoid *) t010);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t010[0], t010);
- }
- }
- if (useBorderColor & (I1BIT | J1BIT | K0BIT)) {
- COPY_CHAN4(t110, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, j1, k0, (GLvoid *) t110);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t110[0], t110);
- }
- }
-
- if (useBorderColor & (I0BIT | J0BIT | K1BIT)) {
- COPY_CHAN4(t001, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, j0, k1, (GLvoid *) t001);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t001[0], t001);
- }
- }
- if (useBorderColor & (I1BIT | J0BIT | K1BIT)) {
- COPY_CHAN4(t101, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, j0, k1, (GLvoid *) t101);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t101[0], t101);
- }
- }
- if (useBorderColor & (I0BIT | J1BIT | K1BIT)) {
- COPY_CHAN4(t011, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i0, j1, k1, (GLvoid *) t011);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t011[0], t011);
- }
- }
- if (useBorderColor & (I1BIT | J1BIT | K1BIT)) {
- COPY_CHAN4(t111, tObj->_BorderChan);
- }
- else {
- (*img->FetchTexel)(img, i1, j1, k1, (GLvoid *) t111);
- if (img->Format == GL_COLOR_INDEX) {
- palette_sample(ctx, tObj, t111[0], t111);
- }
- }
-
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = w000*t000[0] + w010*t010[0] + w001*t001[0] + w011*t011[0] +
- w100*t100[0] + w110*t110[0] + w101*t101[0] + w111*t111[0];
- rgba[1] = w000*t000[1] + w010*t010[1] + w001*t001[1] + w011*t011[1] +
- w100*t100[1] + w110*t110[1] + w101*t101[1] + w111*t111[1];
- rgba[2] = w000*t000[2] + w010*t010[2] + w001*t001[2] + w011*t011[2] +
- w100*t100[2] + w110*t110[2] + w101*t101[2] + w111*t111[2];
- rgba[3] = w000*t000[3] + w010*t010[3] + w001*t001[3] + w011*t011[3] +
- w100*t100[3] + w110*t110[3] + w101*t101[3] + w111*t111[3];
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (w000*t000[0] + w010*t010[0] +
- w001*t001[0] + w011*t011[0] +
- w100*t100[0] + w110*t110[0] +
- w101*t101[0] + w111*t111[0] + 0.5);
- rgba[1] = (GLchan) (w000*t000[1] + w010*t010[1] +
- w001*t001[1] + w011*t011[1] +
- w100*t100[1] + w110*t110[1] +
- w101*t101[1] + w111*t111[1] + 0.5);
- rgba[2] = (GLchan) (w000*t000[2] + w010*t010[2] +
- w001*t001[2] + w011*t011[2] +
- w100*t100[2] + w110*t110[2] +
- w101*t101[2] + w111*t111[2] + 0.5);
- rgba[3] = (GLchan) (w000*t000[3] + w010*t010[3] +
- w001*t001[3] + w011*t011[3] +
- w100*t100[3] + w110*t110[3] +
- w101*t101[3] + w111*t111[3] + 0.5);
-#else /* CHAN_BITS == 8 */
- rgba[0] = (GLchan) (
- (w000*t000[0] + w010*t010[0] + w001*t001[0] + w011*t011[0] +
- w100*t100[0] + w110*t110[0] + w101*t101[0] + w111*t111[0] )
- >> WEIGHT_SHIFT);
- rgba[1] = (GLchan) (
- (w000*t000[1] + w010*t010[1] + w001*t001[1] + w011*t011[1] +
- w100*t100[1] + w110*t110[1] + w101*t101[1] + w111*t111[1] )
- >> WEIGHT_SHIFT);
- rgba[2] = (GLchan) (
- (w000*t000[2] + w010*t010[2] + w001*t001[2] + w011*t011[2] +
- w100*t100[2] + w110*t110[2] + w101*t101[2] + w111*t111[2] )
- >> WEIGHT_SHIFT);
- rgba[3] = (GLchan) (
- (w000*t000[3] + w010*t010[3] + w001*t001[3] + w011*t011[3] +
- w100*t100[3] + w110*t110[3] + w101*t101[3] + w111*t111[3] )
- >> WEIGHT_SHIFT);
-#endif
-
- }
-}
-
-
-
-static void
-sample_3d_nearest_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- GLuint i;
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- sample_3d_nearest(ctx, tObj, tObj->Image[level], texcoord[i], rgba[i]);
- }
-}
-
-
-static void
-sample_3d_linear_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- sample_3d_linear(ctx, tObj, tObj->Image[level], texcoord[i], rgba[i]);
- }
-}
-
-
-static void
-sample_3d_nearest_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_3d_nearest(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4]; /* texels */
- const GLfloat f = FRAC(lambda[i]);
- sample_3d_nearest(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_3d_nearest(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
-
-
-static void
-sample_3d_linear_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- if (level >= tObj->_MaxLevel) {
- sample_3d_linear(ctx, tObj, tObj->Image[tObj->_MaxLevel],
- texcoord[i], rgba[i]);
- }
- else {
- GLchan t0[4], t1[4]; /* texels */
- const GLfloat f = FRAC(lambda[i]);
- sample_3d_linear(ctx, tObj, tObj->Image[level ], texcoord[i], t0);
- sample_3d_linear(ctx, tObj, tObj->Image[level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
-
-
-static void
-sample_nearest_3d(GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
-{
- GLuint i;
- struct gl_texture_image *image = tObj->Image[tObj->BaseLevel];
- (void) lambda;
- for (i=0;i<n;i++) {
- sample_3d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
- }
-}
-
-
-
-static void
-sample_linear_3d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
-{
- GLuint i;
- struct gl_texture_image *image = tObj->Image[tObj->BaseLevel];
- (void) lambda;
- for (i=0;i<n;i++) {
- sample_3d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
- }
-}
-
-
-/*
- * Given an (s,t,r) texture coordinate and lambda (level of detail) value,
- * return a texture sample.
- */
-static void
-sample_lambda_3d( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4] )
-{
- GLuint minStart, minEnd; /* texels with minification */
- GLuint magStart, magEnd; /* texels with magnification */
- GLuint i;
-
- ASSERT(lambda != NULL);
- compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
- n, lambda, &minStart, &minEnd, &magStart, &magEnd);
-
- if (minStart < minEnd) {
- /* do the minified texels */
- GLuint m = minEnd - minStart;
- switch (tObj->MinFilter) {
- case GL_NEAREST:
- for (i = minStart; i < minEnd; i++)
- sample_3d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- case GL_LINEAR:
- for (i = minStart; i < minEnd; i++)
- sample_3d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- case GL_NEAREST_MIPMAP_NEAREST:
- sample_3d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_NEAREST:
- sample_3d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_NEAREST_MIPMAP_LINEAR:
- sample_3d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_LINEAR:
- sample_3d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- default:
- _mesa_problem(ctx, "Bad min filter in sample_3d_texture");
- return;
- }
- }
+ int unit;
+ for (unit = 0; unit <= ctx->Texture._MaxEnabledTexImageUnit; unit++) {
+ struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
- if (magStart < magEnd) {
- /* do the magnified texels */
- switch (tObj->MagFilter) {
- case GL_NEAREST:
- for (i = magStart; i < magEnd; i++)
- sample_3d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- case GL_LINEAR:
- for (i = magStart; i < magEnd; i++)
- sample_3d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel],
- texcoords[i], rgba[i]);
- break;
- default:
- _mesa_problem(ctx, "Bad mag filter in sample_3d_texture");
- return;
- }
- }
-}
-
-
-/**********************************************************************/
-/* Texture Cube Map Sampling Functions */
-/**********************************************************************/
-
-/*
- * Choose one of six sides of a texture cube map given the texture
- * coord (rx,ry,rz). Return pointer to corresponding array of texture
- * images.
- */
-static const struct gl_texture_image **
-choose_cube_face(const struct gl_texture_object *texObj,
- const GLfloat texcoord[4], GLfloat newCoord[4])
-{
-/*
- major axis
- direction target sc tc ma
- ---------- ------------------------------- --- --- ---
- +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
- -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
- +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
- -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
- +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
- -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
-*/
- const GLfloat rx = texcoord[0];
- const GLfloat ry = texcoord[1];
- const GLfloat rz = texcoord[2];
- const struct gl_texture_image **imgArray;
- const GLfloat arx = ABSF(rx), ary = ABSF(ry), arz = ABSF(rz);
- GLfloat sc, tc, ma;
-
- if (arx > ary && arx > arz) {
- if (rx >= 0.0F) {
- imgArray = (const struct gl_texture_image **) texObj->Image;
- sc = -rz;
- tc = -ry;
- ma = arx;
- }
- else {
- imgArray = (const struct gl_texture_image **) texObj->NegX;
- sc = rz;
- tc = -ry;
- ma = arx;
- }
- }
- else if (ary > arx && ary > arz) {
- if (ry >= 0.0F) {
- imgArray = (const struct gl_texture_image **) texObj->PosY;
- sc = rx;
- tc = rz;
- ma = ary;
- }
- else {
- imgArray = (const struct gl_texture_image **) texObj->NegY;
- sc = rx;
- tc = -rz;
- ma = ary;
- }
- }
- else {
- if (rz > 0.0F) {
- imgArray = (const struct gl_texture_image **) texObj->PosZ;
- sc = rx;
- tc = -ry;
- ma = arz;
- }
- else {
- imgArray = (const struct gl_texture_image **) texObj->NegZ;
- sc = -rx;
- tc = -ry;
- ma = arz;
- }
- }
-
- newCoord[0] = ( sc / ma + 1.0F ) * 0.5F;
- newCoord[1] = ( tc / ma + 1.0F ) * 0.5F;
- return imgArray;
-}
-
-
-static void
-sample_nearest_cube(GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
-{
- GLuint i;
- (void) lambda;
- for (i = 0; i < n; i++) {
- const struct gl_texture_image **images;
- GLfloat newCoord[4];
- images = choose_cube_face(tObj, texcoords[i], newCoord);
- sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel],
- newCoord, rgba[i]);
- }
-}
-
-
-static void
-sample_linear_cube(GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- (void) lambda;
- for (i = 0; i < n; i++) {
- const struct gl_texture_image **images;
- GLfloat newCoord[4];
- images = choose_cube_face(tObj, texcoords[i], newCoord);
- sample_2d_linear(ctx, tObj, images[tObj->BaseLevel],
- newCoord, rgba[i]);
- }
-}
-
-
-static void
-sample_cube_nearest_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- const struct gl_texture_image **images;
- GLfloat newCoord[4];
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- images = choose_cube_face(tObj, texcoord[i], newCoord);
- sample_2d_nearest(ctx, tObj, images[level], newCoord, rgba[i]);
- }
-}
-
-
-static void
-sample_cube_linear_mipmap_nearest(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- const struct gl_texture_image **images;
- GLfloat newCoord[4];
- GLint level;
- COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
- images = choose_cube_face(tObj, texcoord[i], newCoord);
- sample_2d_linear(ctx, tObj, images[level], newCoord, rgba[i]);
- }
-}
-
-
-static void
-sample_cube_nearest_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- const struct gl_texture_image **images;
- GLfloat newCoord[4];
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- images = choose_cube_face(tObj, texcoord[i], newCoord);
- if (level >= tObj->_MaxLevel) {
- sample_2d_nearest(ctx, tObj, images[tObj->_MaxLevel],
- newCoord, rgba[i]);
- }
- else {
- GLchan t0[4], t1[4]; /* texels */
- const GLfloat f = FRAC(lambda[i]);
- sample_2d_nearest(ctx, tObj, images[level ], newCoord, t0);
- sample_2d_nearest(ctx, tObj, images[level+1], newCoord, t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
-
-
-static void
-sample_cube_linear_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- GLuint i;
- ASSERT(lambda != NULL);
- for (i = 0; i < n; i++) {
- const struct gl_texture_image **images;
- GLfloat newCoord[4];
- GLint level;
- COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
- images = choose_cube_face(tObj, texcoord[i], newCoord);
- if (level >= tObj->_MaxLevel) {
- sample_2d_linear(ctx, tObj, images[tObj->_MaxLevel],
- newCoord, rgba[i]);
- }
- else {
- GLchan t0[4], t1[4];
- const GLfloat f = FRAC(lambda[i]);
- sample_2d_linear(ctx, tObj, images[level ], newCoord, t0);
- sample_2d_linear(ctx, tObj, images[level+1], newCoord, t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
- }
- }
-}
-
-
-static void
-sample_lambda_cube( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
-{
- GLuint minStart, minEnd; /* texels with minification */
- GLuint magStart, magEnd; /* texels with magnification */
-
- ASSERT(lambda != NULL);
- compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
- n, lambda, &minStart, &minEnd, &magStart, &magEnd);
-
- if (minStart < minEnd) {
- /* do the minified texels */
- const GLuint m = minEnd - minStart;
- switch (tObj->MinFilter) {
- case GL_NEAREST:
- sample_nearest_cube(ctx, texUnit, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR:
- sample_linear_cube(ctx, texUnit, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_NEAREST_MIPMAP_NEAREST:
- sample_cube_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_NEAREST:
- sample_cube_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_NEAREST_MIPMAP_LINEAR:
- sample_cube_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- case GL_LINEAR_MIPMAP_LINEAR:
- sample_cube_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
- break;
- default:
- _mesa_problem(ctx, "Bad min filter in sample_lambda_cube");
- }
- }
-
- if (magStart < magEnd) {
- /* do the magnified texels */
- const GLuint m = magEnd - magStart;
- switch (tObj->MagFilter) {
- case GL_NEAREST:
- sample_nearest_cube(ctx, texUnit, tObj, m, texcoords + magStart,
- lambda + magStart, rgba + magStart);
- break;
- case GL_LINEAR:
- sample_linear_cube(ctx, texUnit, tObj, m, texcoords + magStart,
- lambda + magStart, rgba + magStart);
- break;
- default:
- _mesa_problem(ctx, "Bad mag filter in sample_lambda_cube");
- }
- }
-}
-
-
-/**********************************************************************/
-/* Texture Rectangle Sampling Functions */
-/**********************************************************************/
-
-static void
-sample_nearest_rect(GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
-{
- const struct gl_texture_image *img = tObj->Image[0];
- const GLfloat width = (GLfloat) img->Width;
- const GLfloat height = (GLfloat) img->Height;
- const GLint width_minus_1 = img->Width - 1;
- const GLint height_minus_1 = img->Height - 1;
- GLuint i;
-
- (void) texUnit;
- (void) lambda;
-
- ASSERT(tObj->WrapS == GL_CLAMP ||
- tObj->WrapS == GL_CLAMP_TO_EDGE ||
- tObj->WrapS == GL_CLAMP_TO_BORDER_ARB);
- ASSERT(tObj->WrapT == GL_CLAMP ||
- tObj->WrapT == GL_CLAMP_TO_EDGE ||
- tObj->WrapT == GL_CLAMP_TO_BORDER_ARB);
- ASSERT(img->Format != GL_COLOR_INDEX);
-
- /* XXX move Wrap mode tests outside of loops for common cases */
- for (i = 0; i < n; i++) {
- GLint row, col;
- /* NOTE: we DO NOT use [0, 1] texture coordinates! */
- if (tObj->WrapS == GL_CLAMP) {
- col = IFLOOR( CLAMP(texcoords[i][0], 0.0F, width) );
- }
- else if (tObj->WrapS == GL_CLAMP_TO_EDGE) {
- col = IFLOOR( CLAMP(texcoords[i][0], 0.5F, width - 0.5F) );
- }
- else {
- col = IFLOOR( CLAMP(texcoords[i][0], -0.5F, width + 0.5F) );
- }
- if (tObj->WrapT == GL_CLAMP) {
- row = IFLOOR( CLAMP(texcoords[i][1], 0.0F, height) );
- }
- else if (tObj->WrapT == GL_CLAMP_TO_EDGE) {
- row = IFLOOR( CLAMP(texcoords[i][1], 0.5F, height - 0.5F) );
- }
- else {
- row = IFLOOR( CLAMP(texcoords[i][1], -0.5F, height + 0.5F) );
- }
-
- col = CLAMP(col, 0, width_minus_1);
- row = CLAMP(row, 0, height_minus_1);
-
- (*img->FetchTexel)(img, col, row, 0, (GLvoid *) rgba[i]);
- }
-}
-
-
-static void
-sample_linear_rect(GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4])
-{
- const struct gl_texture_image *img = tObj->Image[0];
- const GLfloat width = (GLfloat) img->Width;
- const GLfloat height = (GLfloat) img->Height;
- const GLint width_minus_1 = img->Width - 1;
- const GLint height_minus_1 = img->Height - 1;
- GLuint i;
-
- (void) texUnit;
- (void) lambda;
-
- ASSERT(tObj->WrapS == GL_CLAMP ||
- tObj->WrapS == GL_CLAMP_TO_EDGE ||
- tObj->WrapS == GL_CLAMP_TO_BORDER_ARB);
- ASSERT(tObj->WrapT == GL_CLAMP ||
- tObj->WrapT == GL_CLAMP_TO_EDGE ||
- tObj->WrapT == GL_CLAMP_TO_BORDER_ARB);
- ASSERT(img->Format != GL_COLOR_INDEX);
-
- /* XXX lots of opportunity for optimization in this loop */
- for (i = 0; i < n; i++) {
- GLfloat frow, fcol;
- GLint row0, col0, row1, col1;
- GLchan t00[4], t01[4], t10[4], t11[4];
- GLfloat a, b, w00, w01, w10, w11;
-
- /* NOTE: we DO NOT use [0, 1] texture coordinates! */
- if (tObj->WrapS == GL_CLAMP) {
- fcol = CLAMP(texcoords[i][0], 0.0F, width);
- }
- else if (tObj->WrapS == GL_CLAMP_TO_EDGE) {
- fcol = CLAMP(texcoords[i][0], 0.5F, width - 0.5F);
- }
- else {
- fcol = CLAMP(texcoords[i][0], -0.5F, width + 0.5F);
- }
- if (tObj->WrapT == GL_CLAMP) {
- frow = CLAMP(texcoords[i][1], 0.0F, height);
- }
- else if (tObj->WrapT == GL_CLAMP_TO_EDGE) {
- frow = CLAMP(texcoords[i][1], 0.5F, height - 0.5F);
- }
- else {
- frow = CLAMP(texcoords[i][1], -0.5F, height + 0.5F);
- }
-
- /* compute integer rows/columns */
- col0 = IFLOOR(fcol);
- col1 = col0 + 1;
- col0 = CLAMP(col0, 0, width_minus_1);
- col1 = CLAMP(col1, 0, width_minus_1);
- row0 = IFLOOR(frow);
- row1 = row0 + 1;
- row0 = CLAMP(row0, 0, height_minus_1);
- row1 = CLAMP(row1, 0, height_minus_1);
-
- /* get four texel samples */
- (*img->FetchTexel)(img, col0, row0, 0, (GLvoid *) t00);
- (*img->FetchTexel)(img, col1, row0, 0, (GLvoid *) t10);
- (*img->FetchTexel)(img, col0, row1, 0, (GLvoid *) t01);
- (*img->FetchTexel)(img, col1, row1, 0, (GLvoid *) t11);
-
- /* compute sample weights */
- a = FRAC(fcol);
- b = FRAC(frow);
- w00 = (1.0F-a) * (1.0F-b);
- w10 = a * (1.0F-b);
- w01 = (1.0F-a) * b ;
- w11 = a * b ;
-
- /* compute weighted average of samples */
- rgba[i][0] =
- (GLchan) (w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0]);
- rgba[i][1] =
- (GLchan) (w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1]);
- rgba[i][2] =
- (GLchan) (w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2]);
- rgba[i][3] =
- (GLchan) (w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3]);
- }
-}
-
-
-static void
-sample_lambda_rect( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
-{
- GLuint minStart, minEnd, magStart, magEnd;
-
- /* We only need lambda to decide between minification and magnification.
- * There is no mipmapping with rectangular textures.
- */
- compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
- n, lambda, &minStart, &minEnd, &magStart, &magEnd);
-
- if (minStart < minEnd) {
- if (tObj->MinFilter == GL_NEAREST) {
- sample_nearest_rect( ctx, texUnit, tObj, minEnd - minStart,
- texcoords + minStart, NULL, rgba + minStart);
- }
- else {
- sample_linear_rect( ctx, texUnit, tObj, minEnd - minStart,
- texcoords + minStart, NULL, rgba + minStart);
- }
- }
- if (magStart < magEnd) {
- if (tObj->MagFilter == GL_NEAREST) {
- sample_nearest_rect( ctx, texUnit, tObj, magEnd - magStart,
- texcoords + magStart, NULL, rgba + magStart);
- }
- else {
- sample_linear_rect( ctx, texUnit, tObj, magEnd - magStart,
- texcoords + magStart, NULL, rgba + magStart);
- }
- }
-}
-
-
-
-/*
- * Sample a shadow/depth texture.
- */
-static void
-sample_depth_texture( GLcontext *ctx, GLuint unit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan texel[][4] )
-{
- const GLint baseLevel = tObj->BaseLevel;
- const struct gl_texture_image *texImage = tObj->Image[baseLevel];
- const GLuint width = texImage->Width;
- const GLuint height = texImage->Height;
- GLchan ambient;
- GLenum function;
- GLchan result;
-
- (void) unit;
-
- ASSERT(tObj->Image[tObj->BaseLevel]->Format == GL_DEPTH_COMPONENT);
- ASSERT(tObj->Target == GL_TEXTURE_1D ||
- tObj->Target == GL_TEXTURE_2D ||
- tObj->Target == GL_TEXTURE_RECTANGLE_NV);
-
- UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
-
- /* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */
-
- /* XXX this could be precomputed and saved in the texture object */
- if (tObj->CompareFlag) {
- /* GL_SGIX_shadow */
- if (tObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
- function = GL_LEQUAL;
- }
- else {
- ASSERT(tObj->CompareOperator == GL_TEXTURE_GEQUAL_R_SGIX);
- function = GL_GEQUAL;
- }
- }
- else if (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
- /* GL_ARB_shadow */
- function = tObj->CompareFunc;
- }
- else {
- function = GL_NONE; /* pass depth through as grayscale */
- }
-
- if (tObj->MagFilter == GL_NEAREST) {
- GLuint i;
- for (i = 0; i < n; i++) {
- GLfloat depthSample;
- GLint col, row;
- /* XXX fix for texture rectangle! */
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0], width, col);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1], height, row);
- depthSample = *((const GLfloat *) texImage->Data + row * width + col);
-
- switch (function) {
- case GL_LEQUAL:
- result = (texcoords[i][2] <= depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_GEQUAL:
- result = (texcoords[i][2] >= depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_LESS:
- result = (texcoords[i][2] < depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_GREATER:
- result = (texcoords[i][2] > depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_EQUAL:
- result = (texcoords[i][2] == depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_NOTEQUAL:
- result = (texcoords[i][2] != depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_ALWAYS:
- result = CHAN_MAX;
- break;
- case GL_NEVER:
- result = ambient;
- break;
- case GL_NONE:
- CLAMPED_FLOAT_TO_CHAN(result, depthSample);
- break;
- default:
- _mesa_problem(ctx, "Bad compare func in sample_depth_texture");
- return;
- }
-
- switch (tObj->DepthMode) {
- case GL_LUMINANCE:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = CHAN_MAX;
- break;
- case GL_INTENSITY:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = result;
- break;
- case GL_ALPHA:
- texel[i][RCOMP] = 0;
- texel[i][GCOMP] = 0;
- texel[i][BCOMP] = 0;
- texel[i][ACOMP] = result;
- break;
- default:
- _mesa_problem(ctx, "Bad depth texture mode");
- }
- }
- }
- else {
- GLuint i;
- ASSERT(tObj->MagFilter == GL_LINEAR);
- for (i = 0; i < n; i++) {
- GLfloat depth00, depth01, depth10, depth11;
- GLint i0, i1, j0, j1;
- GLfloat u, v;
- GLuint useBorderTexel;
-
- /* XXX fix for texture rectangle! */
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoords[i][0], u, width, i0, i1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoords[i][1], v, height,j0, j1);
-
- useBorderTexel = 0;
- if (texImage->Border) {
- i0 += texImage->Border;
- i1 += texImage->Border;
- j0 += texImage->Border;
- j1 += texImage->Border;
- }
- else {
- if (i0 < 0 || i0 >= (GLint) width) useBorderTexel |= I0BIT;
- if (i1 < 0 || i1 >= (GLint) width) useBorderTexel |= I1BIT;
- if (j0 < 0 || j0 >= (GLint) height) useBorderTexel |= J0BIT;
- if (j1 < 0 || j1 >= (GLint) height) useBorderTexel |= J1BIT;
- }
-
- /* get four depth samples from the texture */
- if (useBorderTexel & (I0BIT | J0BIT)) {
- depth00 = 1.0;
- }
- else {
- depth00 = *((const GLfloat *) texImage->Data + j0 * width + i0);
- }
- if (useBorderTexel & (I1BIT | J0BIT)) {
- depth10 = 1.0;
- }
- else {
- depth10 = *((const GLfloat *) texImage->Data + j0 * width + i1);
- }
- if (useBorderTexel & (I0BIT | J1BIT)) {
- depth01 = 1.0;
- }
- else {
- depth01 = *((const GLfloat *) texImage->Data + j1 * width + i0);
- }
- if (useBorderTexel & (I1BIT | J1BIT)) {
- depth11 = 1.0;
- }
- else {
- depth11 = *((const GLfloat *) texImage->Data + j1 * width + i1);
- }
-
- if (0) {
- /* compute a single weighted depth sample and do one comparison */
- const GLfloat a = FRAC(u + 1.0F);
- const GLfloat b = FRAC(v + 1.0F);
- const GLfloat w00 = (1.0F - a) * (1.0F - b);
- const GLfloat w10 = ( a) * (1.0F - b);
- const GLfloat w01 = (1.0F - a) * ( b);
- const GLfloat w11 = ( a) * ( b);
- const GLfloat depthSample = w00 * depth00 + w10 * depth10
- + w01 * depth01 + w11 * depth11;
- if ((depthSample <= texcoords[i][2] && function == GL_LEQUAL) ||
- (depthSample >= texcoords[i][2] && function == GL_GEQUAL)) {
- result = ambient;
- }
- else {
- result = CHAN_MAX;
- }
- }
- else {
- /* Do four depth/R comparisons and compute a weighted result.
- * If this touches on somebody's I.P., I'll remove this code
- * upon request.
- */
- const GLfloat d = (CHAN_MAXF - (GLfloat) ambient) * 0.25F;
- GLfloat luminance = CHAN_MAXF;
-
- switch (function) {
- case GL_LEQUAL:
- if (depth00 <= texcoords[i][2]) luminance -= d;
- if (depth01 <= texcoords[i][2]) luminance -= d;
- if (depth10 <= texcoords[i][2]) luminance -= d;
- if (depth11 <= texcoords[i][2]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_GEQUAL:
- if (depth00 >= texcoords[i][2]) luminance -= d;
- if (depth01 >= texcoords[i][2]) luminance -= d;
- if (depth10 >= texcoords[i][2]) luminance -= d;
- if (depth11 >= texcoords[i][2]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_LESS:
- if (depth00 < texcoords[i][2]) luminance -= d;
- if (depth01 < texcoords[i][2]) luminance -= d;
- if (depth10 < texcoords[i][2]) luminance -= d;
- if (depth11 < texcoords[i][2]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_GREATER:
- if (depth00 > texcoords[i][2]) luminance -= d;
- if (depth01 > texcoords[i][2]) luminance -= d;
- if (depth10 > texcoords[i][2]) luminance -= d;
- if (depth11 > texcoords[i][2]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_EQUAL:
- if (depth00 == texcoords[i][2]) luminance -= d;
- if (depth01 == texcoords[i][2]) luminance -= d;
- if (depth10 == texcoords[i][2]) luminance -= d;
- if (depth11 == texcoords[i][2]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_NOTEQUAL:
- if (depth00 != texcoords[i][2]) luminance -= d;
- if (depth01 != texcoords[i][2]) luminance -= d;
- if (depth10 != texcoords[i][2]) luminance -= d;
- if (depth11 != texcoords[i][2]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_ALWAYS:
- result = 0;
- break;
- case GL_NEVER:
- result = CHAN_MAX;
- break;
- case GL_NONE:
- /* ordinary bilinear filtering */
- {
- const GLfloat a = FRAC(u + 1.0F);
- const GLfloat b = FRAC(v + 1.0F);
- const GLfloat w00 = (1.0F - a) * (1.0F - b);
- const GLfloat w10 = ( a) * (1.0F - b);
- const GLfloat w01 = (1.0F - a) * ( b);
- const GLfloat w11 = ( a) * ( b);
- const GLfloat depthSample = w00 * depth00 + w10 * depth10
- + w01 * depth01 + w11 * depth11;
- CLAMPED_FLOAT_TO_CHAN(result, depthSample);
- }
- break;
- default:
- _mesa_problem(ctx, "Bad compare func in sample_depth_texture");
- return;
- }
- }
-
- switch (tObj->DepthMode) {
- case GL_LUMINANCE:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = CHAN_MAX;
- break;
- case GL_INTENSITY:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = result;
- break;
- case GL_ALPHA:
- texel[i][RCOMP] = 0;
- texel[i][GCOMP] = 0;
- texel[i][BCOMP] = 0;
- texel[i][ACOMP] = result;
- break;
- default:
- _mesa_problem(ctx, "Bad depth texture mode");
- }
- } /* for */
- } /* if filter */
-}
-
-
-#if 0
-/*
- * Experimental depth texture sampling function.
- */
-static void
-sample_depth_texture2(const GLcontext *ctx,
- const struct gl_texture_unit *texUnit,
- GLuint n, GLfloat texcoords[][4],
- GLchan texel[][4])
-{
- const struct gl_texture_object *texObj = texUnit->_Current;
- const GLint baseLevel = texObj->BaseLevel;
- const struct gl_texture_image *texImage = texObj->Image[baseLevel];
- const GLuint width = texImage->Width;
- const GLuint height = texImage->Height;
- GLchan ambient;
- GLboolean lequal, gequal;
-
- if (texObj->Target != GL_TEXTURE_2D) {
- _mesa_problem(ctx, "only 2-D depth textures supported at this time");
- return;
- }
-
- if (texObj->MinFilter != texObj->MagFilter) {
- _mesa_problem(ctx, "mipmapped depth textures not supported at this time");
- return;
- }
-
- /* XXX the GL_SGIX_shadow extension spec doesn't say what to do if
- * GL_TEXTURE_COMPARE_SGIX == GL_TRUE but the current texture object
- * isn't a depth texture.
- */
- if (texImage->Format != GL_DEPTH_COMPONENT) {
- _mesa_problem(ctx,"GL_TEXTURE_COMPARE_SGIX enabled with non-depth texture");
- return;
- }
-
- UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
-
- if (texObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
- lequal = GL_TRUE;
- gequal = GL_FALSE;
- }
- else {
- lequal = GL_FALSE;
- gequal = GL_TRUE;
- }
-
- {
- GLuint i;
- for (i = 0; i < n; i++) {
- const GLint K = 3;
- GLint col, row, ii, jj, imin, imax, jmin, jmax, samples, count;
- GLfloat w;
- GLchan lum;
- COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapS, texcoords[i][0],
- width, col);
- COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapT, texcoords[i][1],
- height, row);
-
- imin = col - K;
- imax = col + K;
- jmin = row - K;
- jmax = row + K;
-
- if (imin < 0) imin = 0;
- if (imax >= width) imax = width - 1;
- if (jmin < 0) jmin = 0;
- if (jmax >= height) jmax = height - 1;
-
- samples = (imax - imin + 1) * (jmax - jmin + 1);
- count = 0;
- for (jj = jmin; jj <= jmax; jj++) {
- for (ii = imin; ii <= imax; ii++) {
- GLfloat depthSample = *((const GLfloat *) texImage->Data
- + jj * width + ii);
- if ((depthSample <= r[i] && lequal) ||
- (depthSample >= r[i] && gequal)) {
- count++;
- }
- }
- }
-
- w = (GLfloat) count / (GLfloat) samples;
- w = CHAN_MAXF - w * (CHAN_MAXF - (GLfloat) ambient);
- lum = (GLint) w;
-
- texel[i][RCOMP] = lum;
- texel[i][GCOMP] = lum;
- texel[i][BCOMP] = lum;
- texel[i][ACOMP] = CHAN_MAX;
- }
- }
-}
-#endif
-
-
-/**
- * We use this function when a texture object is in an "incomplete" state.
- */
-static void
-null_sample_func( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *tObj, GLuint n,
- GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
-{
-}
-
-
-
-/**
- * Setup the texture sampling function for this texture object.
- */
-void
-_swrast_choose_texture_sample_func( GLcontext *ctx, GLuint texUnit,
- const struct gl_texture_object *t )
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
- if (!t->Complete) {
- swrast->TextureSample[texUnit] = null_sample_func;
- }
- else {
- const GLboolean needLambda = (GLboolean) (t->MinFilter != t->MagFilter);
- const GLenum format = t->Image[t->BaseLevel]->Format;
-
- if (needLambda) {
- /* Compute min/mag filter threshold */
- if (t->MagFilter == GL_LINEAR
- && (t->MinFilter == GL_NEAREST_MIPMAP_NEAREST ||
- t->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) {
- swrast->_MinMagThresh[texUnit] = 0.5F;
- }
- else {
- swrast->_MinMagThresh[texUnit] = 0.0F;
- }
- }
-
- switch (t->Target) {
- case GL_TEXTURE_1D:
- if (format == GL_DEPTH_COMPONENT) {
- swrast->TextureSample[texUnit] = sample_depth_texture;
- }
- else if (needLambda) {
- swrast->TextureSample[texUnit] = sample_lambda_1d;
- }
- else if (t->MinFilter == GL_LINEAR) {
- swrast->TextureSample[texUnit] = sample_linear_1d;
- }
- else {
- ASSERT(t->MinFilter == GL_NEAREST);
- swrast->TextureSample[texUnit] = sample_nearest_1d;
- }
- break;
- case GL_TEXTURE_2D:
- if (format == GL_DEPTH_COMPONENT) {
- swrast->TextureSample[texUnit] = sample_depth_texture;
- }
- else if (needLambda) {
- swrast->TextureSample[texUnit] = sample_lambda_2d;
- }
- else if (t->MinFilter == GL_LINEAR) {
- swrast->TextureSample[texUnit] = sample_linear_2d;
- }
- else {
- GLint baseLevel = t->BaseLevel;
- ASSERT(t->MinFilter == GL_NEAREST);
- if (t->WrapS == GL_REPEAT &&
- t->WrapT == GL_REPEAT &&
- t->Image[baseLevel]->Border == 0 &&
- t->Image[baseLevel]->TexFormat->MesaFormat == MESA_FORMAT_RGB) {
- swrast->TextureSample[texUnit] = opt_sample_rgb_2d;
- }
- else if (t->WrapS == GL_REPEAT &&
- t->WrapT == GL_REPEAT &&
- t->Image[baseLevel]->Border == 0 &&
- t->Image[baseLevel]->TexFormat->MesaFormat == MESA_FORMAT_RGBA) {
- swrast->TextureSample[texUnit] = opt_sample_rgba_2d;
- }
- else
- swrast->TextureSample[texUnit] = sample_nearest_2d;
- }
- break;
- case GL_TEXTURE_3D:
- if (needLambda) {
- swrast->TextureSample[texUnit] = sample_lambda_3d;
- }
- else if (t->MinFilter == GL_LINEAR) {
- swrast->TextureSample[texUnit] = sample_linear_3d;
- }
- else {
- ASSERT(t->MinFilter == GL_NEAREST);
- swrast->TextureSample[texUnit] = sample_nearest_3d;
- }
- break;
- case GL_TEXTURE_CUBE_MAP_ARB:
- if (needLambda) {
- swrast->TextureSample[texUnit] = sample_lambda_cube;
- }
- else if (t->MinFilter == GL_LINEAR) {
- swrast->TextureSample[texUnit] = sample_linear_cube;
- }
- else {
- ASSERT(t->MinFilter == GL_NEAREST);
- swrast->TextureSample[texUnit] = sample_nearest_cube;
- }
- break;
- case GL_TEXTURE_RECTANGLE_NV:
- if (needLambda) {
- swrast->TextureSample[texUnit] = sample_lambda_rect;
- }
- else if (t->MinFilter == GL_LINEAR) {
- swrast->TextureSample[texUnit] = sample_linear_rect;
- }
- else {
- ASSERT(t->MinFilter == GL_NEAREST);
- swrast->TextureSample[texUnit] = sample_nearest_rect;
- }
- break;
- default:
- _mesa_problem(ctx, "invalid target in _swrast_choose_texture_sample_func");
- }
- }
-}
-
-
-#define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) )
-#define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) )
-
-
-/**
- * Do texture application for GL_ARB/EXT_texture_env_combine.
- * Input:
- * ctx - rendering context
- * textureUnit - the texture unit to apply
- * n - number of fragments to process (span width)
- * primary_rgba - incoming fragment color array
- * texelBuffer - pointer to texel colors for all texture units
- * Input/Output:
- * rgba - incoming colors, which get modified here
- */
-static INLINE void
-texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
- CONST GLchan (*primary_rgba)[4],
- CONST GLchan *texelBuffer,
- GLchan (*rgba)[4] )
-{
- const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]);
- const GLchan (*argRGB [3])[4];
- const GLchan (*argA [3])[4];
- const GLuint RGBshift = textureUnit->CombineScaleShiftRGB;
- const GLuint Ashift = textureUnit->CombineScaleShiftA;
-#if CHAN_TYPE == GL_FLOAT
- const GLchan RGBmult = (GLfloat) (1 << RGBshift);
- const GLchan Amult = (GLfloat) (1 << Ashift);
-#else
- const GLint half = (CHAN_MAX + 1) / 2;
-#endif
- GLuint i, j;
-
- /* GLchan ccolor[3][4]; */
- DEFMNARRAY(GLchan, ccolor, 3, 3 * MAX_WIDTH, 4); /* mac 32k limitation */
- CHECKARRAY(ccolor, return); /* mac 32k limitation */
-
- ASSERT(ctx->Extensions.EXT_texture_env_combine ||
- ctx->Extensions.ARB_texture_env_combine);
- ASSERT(SWRAST_CONTEXT(ctx)->_AnyTextureCombine);
-
-
- /*
- printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n",
- textureUnit->CombineModeRGB,
- textureUnit->CombineModeA,
- textureUnit->CombineSourceRGB[0],
- textureUnit->CombineSourceA[0],
- textureUnit->CombineSourceRGB[1],
- textureUnit->CombineSourceA[1]);
- */
-
- /*
- * Do operand setup for up to 3 operands. Loop over the terms.
- */
- for (j = 0; j < 3; j++) {
- const GLenum srcA = textureUnit->CombineSourceA[j];
- const GLenum srcRGB = textureUnit->CombineSourceRGB[j];
-
- switch (srcA) {
- case GL_TEXTURE:
- argA[j] = (const GLchan (*)[4])
- (texelBuffer + unit * (n * 4 * sizeof(GLchan)));
- break;
- case GL_PRIMARY_COLOR_EXT:
- argA[j] = primary_rgba;
- break;
- case GL_PREVIOUS_EXT:
- argA[j] = (const GLchan (*)[4]) rgba;
- break;
- case GL_CONSTANT_EXT:
- {
- GLchan alpha, (*c)[4] = ccolor[j];
- UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]);
- for (i = 0; i < n; i++)
- c[i][ACOMP] = alpha;
- argA[j] = (const GLchan (*)[4]) ccolor[j];
- }
- break;
- default:
- /* ARB_texture_env_crossbar source */
- {
- const GLuint srcUnit = srcA - GL_TEXTURE0_ARB;
- ASSERT(srcUnit < ctx->Const.MaxTextureUnits);
- if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)
- return;
- argA[j] = (const GLchan (*)[4])
- (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan)));
- }
- }
-
- switch (srcRGB) {
- case GL_TEXTURE:
- argRGB[j] = (const GLchan (*)[4])
- (texelBuffer + unit * (n * 4 * sizeof(GLchan)));
- break;
- case GL_PRIMARY_COLOR_EXT:
- argRGB[j] = primary_rgba;
- break;
- case GL_PREVIOUS_EXT:
- argRGB[j] = (const GLchan (*)[4]) rgba;
- break;
- case GL_CONSTANT_EXT:
- {
- GLchan (*c)[4] = ccolor[j];
- GLchan red, green, blue, alpha;
- UNCLAMPED_FLOAT_TO_CHAN(red, textureUnit->EnvColor[0]);
- UNCLAMPED_FLOAT_TO_CHAN(green, textureUnit->EnvColor[1]);
- UNCLAMPED_FLOAT_TO_CHAN(blue, textureUnit->EnvColor[2]);
- UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]);
- for (i = 0; i < n; i++) {
- c[i][RCOMP] = red;
- c[i][GCOMP] = green;
- c[i][BCOMP] = blue;
- c[i][ACOMP] = alpha;
- }
- argRGB[j] = (const GLchan (*)[4]) ccolor[j];
- }
- break;
- default:
- /* ARB_texture_env_crossbar source */
- {
- const GLuint srcUnit = srcRGB - GL_TEXTURE0_ARB;
- ASSERT(srcUnit < ctx->Const.MaxTextureUnits);
- if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)
- return;
- argRGB[j] = (const GLchan (*)[4])
- (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan)));
- }
- }
-
- if (textureUnit->CombineOperandRGB[j] != GL_SRC_COLOR) {
- const GLchan (*src)[4] = argRGB[j];
- GLchan (*dst)[4] = ccolor[j];
-
- /* point to new arg[j] storage */
- argRGB[j] = (const GLchan (*)[4]) ccolor[j];
-
- if (textureUnit->CombineOperandRGB[j] == GL_ONE_MINUS_SRC_COLOR) {
- for (i = 0; i < n; i++) {
- dst[i][RCOMP] = CHAN_MAX - src[i][RCOMP];
- dst[i][GCOMP] = CHAN_MAX - src[i][GCOMP];
- dst[i][BCOMP] = CHAN_MAX - src[i][BCOMP];
- }
- }
- else if (textureUnit->CombineOperandRGB[j] == GL_SRC_ALPHA) {
- for (i = 0; i < n; i++) {
- dst[i][RCOMP] = src[i][ACOMP];
- dst[i][GCOMP] = src[i][ACOMP];
- dst[i][BCOMP] = src[i][ACOMP];
- }
- }
- else {
- ASSERT(textureUnit->CombineOperandRGB[j] ==GL_ONE_MINUS_SRC_ALPHA);
- for (i = 0; i < n; i++) {
- dst[i][RCOMP] = CHAN_MAX - src[i][ACOMP];
- dst[i][GCOMP] = CHAN_MAX - src[i][ACOMP];
- dst[i][BCOMP] = CHAN_MAX - src[i][ACOMP];
- }
- }
- }
-
- if (textureUnit->CombineOperandA[j] == GL_ONE_MINUS_SRC_ALPHA) {
- const GLchan (*src)[4] = argA[j];
- GLchan (*dst)[4] = ccolor[j];
- argA[j] = (const GLchan (*)[4]) ccolor[j];
- for (i = 0; i < n; i++) {
- dst[i][ACOMP] = CHAN_MAX - src[i][ACOMP];
- }
- }
-
- if (textureUnit->CombineModeRGB == GL_REPLACE &&
- textureUnit->CombineModeA == GL_REPLACE) {
- break; /* done, we need only arg0 */
- }
-
- if (j == 1 &&
- textureUnit->CombineModeRGB != GL_INTERPOLATE_EXT &&
- textureUnit->CombineModeA != GL_INTERPOLATE_EXT) {
- break; /* arg0 and arg1 are done. we don't need arg2. */
- }
- }
-
- /*
- * Do the texture combine.
- */
- switch (textureUnit->CombineModeRGB) {
- case GL_REPLACE:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- if (RGBshift) {
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = arg0[i][RCOMP] * RGBmult;
- rgba[i][GCOMP] = arg0[i][GCOMP] * RGBmult;
- rgba[i][BCOMP] = arg0[i][BCOMP] * RGBmult;
-#else
- GLuint r = (GLuint) arg0[i][RCOMP] << RGBshift;
- GLuint g = (GLuint) arg0[i][GCOMP] << RGBshift;
- GLuint b = (GLuint) arg0[i][BCOMP] << RGBshift;
- rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
-#endif
- }
- }
- else {
- for (i = 0; i < n; i++) {
- rgba[i][RCOMP] = arg0[i][RCOMP];
- rgba[i][GCOMP] = arg0[i][GCOMP];
- rgba[i][BCOMP] = arg0[i][BCOMP];
- }
- }
- }
- break;
- case GL_MODULATE:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
-#if CHAN_TYPE != GL_FLOAT
- const GLint shift = CHAN_BITS - RGBshift;
-#endif
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * RGBmult;
- rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * RGBmult;
- rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * RGBmult;
-#else
- GLuint r = PROD(arg0[i][RCOMP], arg1[i][RCOMP]) >> shift;
- GLuint g = PROD(arg0[i][GCOMP], arg1[i][GCOMP]) >> shift;
- GLuint b = PROD(arg0[i][BCOMP], arg1[i][BCOMP]) >> shift;
- rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_ADD:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * RGBmult;
- rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * RGBmult;
- rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * RGBmult;
-#else
- GLint r = ((GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP]) << RGBshift;
- GLint g = ((GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP]) << RGBshift;
- GLint b = ((GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP]) << RGBshift;
- rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_ADD_SIGNED_EXT:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5) * RGBmult;
- rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5) * RGBmult;
- rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5) * RGBmult;
-#else
- GLint r = (GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP] -half;
- GLint g = (GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP] -half;
- GLint b = (GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP] -half;
- r = (r < 0) ? 0 : r << RGBshift;
- g = (g < 0) ? 0 : g << RGBshift;
- b = (b < 0) ? 0 : b << RGBshift;
- rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_INTERPOLATE_EXT:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
- const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
-#if CHAN_TYPE != GL_FLOAT
- const GLint shift = CHAN_BITS - RGBshift;
-#endif
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] +
- arg1[i][RCOMP] * (CHAN_MAXF - arg2[i][RCOMP])) * RGBmult;
- rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] +
- arg1[i][GCOMP] * (CHAN_MAXF - arg2[i][GCOMP])) * RGBmult;
- rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] +
- arg1[i][BCOMP] * (CHAN_MAXF - arg2[i][BCOMP])) * RGBmult;
-#else
- GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP])
- + PROD(arg1[i][RCOMP], CHAN_MAX - arg2[i][RCOMP]))
- >> shift;
- GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP])
- + PROD(arg1[i][GCOMP], CHAN_MAX - arg2[i][GCOMP]))
- >> shift;
- GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP])
- + PROD(arg1[i][BCOMP], CHAN_MAX - arg2[i][BCOMP]))
- >> shift;
- rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_SUBTRACT_ARB:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * RGBmult;
- rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * RGBmult;
- rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * RGBmult;
-#else
- GLint r = ((GLint) arg0[i][RCOMP] - (GLint) arg1[i][RCOMP]) << RGBshift;
- GLint g = ((GLint) arg0[i][GCOMP] - (GLint) arg1[i][GCOMP]) << RGBshift;
- GLint b = ((GLint) arg0[i][BCOMP] - (GLint) arg1[i][BCOMP]) << RGBshift;
- rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
- rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
- rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_DOT3_RGB_EXT:
- case GL_DOT3_RGBA_EXT:
- {
- /* Do not scale the result by 1 2 or 4 */
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) +
- (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) +
- (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F))
- * 4.0F;
- dot = CLAMP(dot, 0.0F, CHAN_MAXF);
-#else
- GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half,
- (GLint)arg1[i][RCOMP] - half) +
- S_PROD((GLint)arg0[i][GCOMP] - half,
- (GLint)arg1[i][GCOMP] - half) +
- S_PROD((GLint)arg0[i][BCOMP] - half,
- (GLint)arg1[i][BCOMP] - half)) >> 6;
- dot = CLAMP(dot, 0, CHAN_MAX);
-#endif
- rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot;
- }
- }
- break;
- case GL_DOT3_RGB_ARB:
- case GL_DOT3_RGBA_ARB:
- {
- /* DO scale the result by 1 2 or 4 */
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) +
- (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) +
- (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F))
- * 4.0F;
- dot = CLAMP(dot, 0.0, CHAN_MAXF) * RGBmult;
-#else
- GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half,
- (GLint)arg1[i][RCOMP] - half) +
- S_PROD((GLint)arg0[i][GCOMP] - half,
- (GLint)arg1[i][GCOMP] - half) +
- S_PROD((GLint)arg0[i][BCOMP] - half,
- (GLint)arg1[i][BCOMP] - half)) >> 6;
- dot = CLAMP(dot, 0, CHAN_MAX) << RGBshift;
-#endif
- rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot;
- }
- }
- break;
- default:
- _mesa_problem(ctx, "invalid combine mode");
- }
-
- switch (textureUnit->CombineModeA) {
- case GL_REPLACE:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
- if (Ashift) {
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- GLchan a = arg0[i][ACOMP] * Amult;
-#else
- GLuint a = (GLuint) arg0[i][ACOMP] << Ashift;
-#endif
- rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
- }
- }
- else {
- for (i = 0; i < n; i++) {
- rgba[i][ACOMP] = arg0[i][ACOMP];
- }
- }
- }
- break;
- case GL_MODULATE:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
-#if CHAN_TYPE != GL_FLOAT
- const GLint shift = CHAN_BITS - Ashift;
-#endif
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * Amult;
-#else
- GLuint a = (PROD(arg0[i][ACOMP], arg1[i][ACOMP]) >> shift);
- rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_ADD:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * Amult;
-#else
- GLint a = ((GLint) arg0[i][ACOMP] + arg1[i][ACOMP]) << Ashift;
- rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_ADD_SIGNED_EXT:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * Amult;
-#else
- GLint a = (GLint) arg0[i][ACOMP] + (GLint) arg1[i][ACOMP] -half;
- a = (a < 0) ? 0 : a << Ashift;
- rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_INTERPOLATE_EXT:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
- const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
-#if CHAN_TYPE != GL_FLOAT
- const GLint shift = CHAN_BITS - Ashift;
-#endif
- for (i=0; i<n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +
- arg1[i][ACOMP] * (CHAN_MAXF - arg2[i][ACOMP]))
- * Amult;
-#else
- GLuint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP])
- + PROD(arg1[i][ACOMP], CHAN_MAX - arg2[i][ACOMP]))
- >> shift;
- rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
-#endif
- }
- }
- break;
- case GL_SUBTRACT_ARB:
- {
- const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
- const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
- for (i = 0; i < n; i++) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * Amult;
-#else
- GLint a = ((GLint) arg0[i][ACOMP] - (GLint) arg1[i][ACOMP]) << Ashift;
- rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
-#endif
- }
- }
- break;
-
- default:
- _mesa_problem(ctx, "invalid combine mode");
- }
-
- /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining.
- * This is kind of a kludge. It would have been better if the spec
- * were written such that the GL_COMBINE_ALPHA value could be set to
- * GL_DOT3.
- */
- if (textureUnit->CombineModeRGB == GL_DOT3_RGBA_EXT ||
- textureUnit->CombineModeRGB == GL_DOT3_RGBA_ARB) {
- for (i = 0; i < n; i++) {
- rgba[i][ACOMP] = rgba[i][RCOMP];
- }
- }
- UNDEFARRAY(ccolor); /* mac 32k limitation */
-}
-#undef PROD
-
-
-/**
- * Implement NVIDIA's GL_NV_texture_env_combine4 extension when
- * texUnit->EnvMode == GL_COMBINE4_NV.
- */
-static INLINE void
-texture_combine4( const GLcontext *ctx, GLuint unit, GLuint n,
- CONST GLchan (*primary_rgba)[4],
- CONST GLchan *texelBuffer,
- GLchan (*rgba)[4] )
-{
-}
-
-
-
-/**
- * Apply a conventional OpenGL texture env mode (REPLACE, ADD, BLEND,
- * MODULATE, or DECAL) to an array of fragments.
- * Input: textureUnit - pointer to texture unit to apply
- * format - base internal texture format
- * n - number of fragments
- * primary_rgba - primary colors (may alias rgba for single texture)
- * texels - array of texel colors
- * InOut: rgba - incoming fragment colors modified by texel colors
- * according to the texture environment mode.
- */
-static void
-texture_apply( const GLcontext *ctx,
- const struct gl_texture_unit *texUnit,
- GLuint n,
- CONST GLchan primary_rgba[][4], CONST GLchan texel[][4],
- GLchan rgba[][4] )
-{
- GLint baseLevel;
- GLuint i;
- GLint Rc, Gc, Bc, Ac;
- GLenum format;
-
- ASSERT(texUnit);
- ASSERT(texUnit->_Current);
-
- baseLevel = texUnit->_Current->BaseLevel;
- ASSERT(texUnit->_Current->Image[baseLevel]);
-
- format = texUnit->_Current->Image[baseLevel]->Format;
-
- if (format == GL_COLOR_INDEX || format == GL_DEPTH_COMPONENT
- || format == GL_YCBCR_MESA) {
- format = GL_RGBA; /* a bit of a hack */
- }
-
- switch (texUnit->EnvMode) {
- case GL_REPLACE:
- switch (format) {
- case GL_ALPHA:
- for (i=0;i<n;i++) {
- /* Cv = Cf */
- /* Av = At */
- rgba[i][ACOMP] = texel[i][ACOMP];
- }
- break;
- case GL_LUMINANCE:
- for (i=0;i<n;i++) {
- /* Cv = Lt */
- GLchan Lt = texel[i][RCOMP];
- rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt;
- /* Av = Af */
- }
- break;
- case GL_LUMINANCE_ALPHA:
- for (i=0;i<n;i++) {
- GLchan Lt = texel[i][RCOMP];
- /* Cv = Lt */
- rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt;
- /* Av = At */
- rgba[i][ACOMP] = texel[i][ACOMP];
- }
- break;
- case GL_INTENSITY:
- for (i=0;i<n;i++) {
- /* Cv = It */
- GLchan It = texel[i][RCOMP];
- rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = It;
- /* Av = It */
- rgba[i][ACOMP] = It;
- }
- break;
- case GL_RGB:
- for (i=0;i<n;i++) {
- /* Cv = Ct */
- rgba[i][RCOMP] = texel[i][RCOMP];
- rgba[i][GCOMP] = texel[i][GCOMP];
- rgba[i][BCOMP] = texel[i][BCOMP];
- /* Av = Af */
- }
- break;
- case GL_RGBA:
- for (i=0;i<n;i++) {
- /* Cv = Ct */
- rgba[i][RCOMP] = texel[i][RCOMP];
- rgba[i][GCOMP] = texel[i][GCOMP];
- rgba[i][BCOMP] = texel[i][BCOMP];
- /* Av = At */
- rgba[i][ACOMP] = texel[i][ACOMP];
- }
- break;
- default:
- _mesa_problem(ctx, "Bad format (GL_REPLACE) in texture_apply");
- return;
- }
- break;
-
- case GL_MODULATE:
- switch (format) {
- case GL_ALPHA:
- for (i=0;i<n;i++) {
- /* Cv = Cf */
- /* Av = AfAt */
- rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
- }
- break;
- case GL_LUMINANCE:
- for (i=0;i<n;i++) {
- /* Cv = LtCf */
- GLchan Lt = texel[i][RCOMP];
- rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt );
- rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt );
- rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt );
- /* Av = Af */
- }
- break;
- case GL_LUMINANCE_ALPHA:
- for (i=0;i<n;i++) {
- /* Cv = CfLt */
- GLchan Lt = texel[i][RCOMP];
- rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt );
- rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt );
- rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt );
- /* Av = AfAt */
- rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
- }
- break;
- case GL_INTENSITY:
- for (i=0;i<n;i++) {
- /* Cv = CfIt */
- GLchan It = texel[i][RCOMP];
- rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], It );
- rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], It );
- rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], It );
- /* Av = AfIt */
- rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], It );
- }
- break;
- case GL_RGB:
- for (i=0;i<n;i++) {
- /* Cv = CfCt */
- rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] );
- rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] );
- rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] );
- /* Av = Af */
- }
- break;
- case GL_RGBA:
- for (i=0;i<n;i++) {
- /* Cv = CfCt */
- rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] );
- rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] );
- rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] );
- /* Av = AfAt */
- rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
- }
- break;
- default:
- _mesa_problem(ctx, "Bad format (GL_MODULATE) in texture_apply");
- return;
- }
- break;
-
- case GL_DECAL:
- switch (format) {
- case GL_ALPHA:
- case GL_LUMINANCE:
- case GL_LUMINANCE_ALPHA:
- case GL_INTENSITY:
- /* undefined */
- break;
- case GL_RGB:
- for (i=0;i<n;i++) {
- /* Cv = Ct */
- rgba[i][RCOMP] = texel[i][RCOMP];
- rgba[i][GCOMP] = texel[i][GCOMP];
- rgba[i][BCOMP] = texel[i][BCOMP];
- /* Av = Af */
- }
- break;
- case GL_RGBA:
- for (i=0;i<n;i++) {
- /* Cv = Cf(1-At) + CtAt */
- GLint t = texel[i][ACOMP], s = CHAN_MAX - t;
- rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(texel[i][RCOMP],t);
- rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(texel[i][GCOMP],t);
- rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(texel[i][BCOMP],t);
- /* Av = Af */
- }
- break;
- default:
- _mesa_problem(ctx, "Bad format (GL_DECAL) in texture_apply");
- return;
- }
- break;
-
- case GL_BLEND:
- Rc = (GLint) (texUnit->EnvColor[0] * CHAN_MAXF);
- Gc = (GLint) (texUnit->EnvColor[1] * CHAN_MAXF);
- Bc = (GLint) (texUnit->EnvColor[2] * CHAN_MAXF);
- Ac = (GLint) (texUnit->EnvColor[3] * CHAN_MAXF);
- switch (format) {
- case GL_ALPHA:
- for (i=0;i<n;i++) {
- /* Cv = Cf */
- /* Av = AfAt */
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
- }
- break;
- case GL_LUMINANCE:
- for (i=0;i<n;i++) {
- /* Cv = Cf(1-Lt) + CcLt */
- GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt;
- rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt);
- rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt);
- rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt);
- /* Av = Af */
- }
- break;
- case GL_LUMINANCE_ALPHA:
- for (i=0;i<n;i++) {
- /* Cv = Cf(1-Lt) + CcLt */
- GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt;
- rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt);
- rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt);
- rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt);
- /* Av = AfAt */
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]);
- }
- break;
- case GL_INTENSITY:
- for (i=0;i<n;i++) {
- /* Cv = Cf(1-It) + CcLt */
- GLchan It = texel[i][RCOMP], s = CHAN_MAX - It;
- rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, It);
- rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, It);
- rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, It);
- /* Av = Af(1-It) + Ac*It */
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], s) + CHAN_PRODUCT(Ac, It);
- }
- break;
- case GL_RGB:
- for (i=0;i<n;i++) {
- /* Cv = Cf(1-Ct) + CcCt */
- rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]);
- rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]);
- rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]);
- /* Av = Af */
- }
- break;
- case GL_RGBA:
- for (i=0;i<n;i++) {
- /* Cv = Cf(1-Ct) + CcCt */
- rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]);
- rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]);
- rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]);
- /* Av = AfAt */
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]);
- }
- break;
- default:
- _mesa_problem(ctx, "Bad format (GL_BLEND) in texture_apply");
- return;
- }
- break;
-
- /* XXX don't clamp results if GLchan is float??? */
-
- case GL_ADD: /* GL_EXT_texture_add_env */
- switch (format) {
- case GL_ALPHA:
- for (i=0;i<n;i++) {
- /* Rv = Rf */
- /* Gv = Gf */
- /* Bv = Bf */
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
- }
- break;
- case GL_LUMINANCE:
- for (i=0;i<n;i++) {
- GLuint Lt = texel[i][RCOMP];
- GLuint r = rgba[i][RCOMP] + Lt;
- GLuint g = rgba[i][GCOMP] + Lt;
- GLuint b = rgba[i][BCOMP] + Lt;
- rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
- /* Av = Af */
- }
- break;
- case GL_LUMINANCE_ALPHA:
- for (i=0;i<n;i++) {
- GLuint Lt = texel[i][RCOMP];
- GLuint r = rgba[i][RCOMP] + Lt;
- GLuint g = rgba[i][GCOMP] + Lt;
- GLuint b = rgba[i][BCOMP] + Lt;
- rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
- }
- break;
- case GL_INTENSITY:
- for (i=0;i<n;i++) {
- GLchan It = texel[i][RCOMP];
- GLuint r = rgba[i][RCOMP] + It;
- GLuint g = rgba[i][GCOMP] + It;
- GLuint b = rgba[i][BCOMP] + It;
- GLuint a = rgba[i][ACOMP] + It;
- rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
- rgba[i][ACOMP] = MIN2(a, CHAN_MAX);
- }
- break;
- case GL_RGB:
- for (i=0;i<n;i++) {
- GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
- GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
- GLuint b = rgba[i][BCOMP] + texel[i][BCOMP];
- rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
- /* Av = Af */
- }
- break;
- case GL_RGBA:
- for (i=0;i<n;i++) {
- GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
- GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
- GLuint b = rgba[i][BCOMP] + texel[i][BCOMP];
- rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
- rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
- rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
- rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
- }
- break;
- default:
- _mesa_problem(ctx, "Bad format (GL_ADD) in texture_apply");
- return;
- }
- break;
-
- default:
- _mesa_problem(ctx, "Bad env mode in texture_apply");
- return;
- }
-}
-
-
-
-/**
- * Apply texture mapping to a span of fragments.
- */
-void
-_swrast_texture_span( GLcontext *ctx, struct sw_span *span )
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
- GLchan primary_rgba[MAX_WIDTH][4];
- GLuint unit;
-
- ASSERT(span->end < MAX_WIDTH);
- ASSERT(span->arrayMask & SPAN_TEXTURE);
-
- /*
- * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)
- */
- if (swrast->_AnyTextureCombine)
- MEMCPY(primary_rgba, span->array->rgba, 4 * span->end * sizeof(GLchan));
-
- /*
- * Must do all texture sampling before combining in order to
- * accomodate GL_ARB_texture_env_crossbar.
- */
- for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
- if (ctx->Texture.Unit[unit]._ReallyEnabled) {
- const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
- const struct gl_texture_object *curObj = texUnit->_Current;
- GLfloat *lambda = span->array->lambda[unit];
- GLchan (*texels)[4] = (GLchan (*)[4])
- (swrast->TexelBuffer + unit * (span->end * 4 * sizeof(GLchan)));
-
- /* adjust texture lod (lambda) */
- if (span->arrayMask | SPAN_LAMBDA) {
- if (texUnit->LodBias != 0.0F) {
- /* apply LOD bias, but don't clamp yet */
- GLuint i;
- for (i = 0; i < span->end; i++) {
- lambda[i] += texUnit->LodBias;
- }
- }
-
- if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) {
- /* apply LOD clamping to lambda */
- const GLfloat min = curObj->MinLod;
- const GLfloat max = curObj->MaxLod;
- GLuint i;
- for (i = 0; i < span->end; i++) {
- GLfloat l = lambda[i];
- lambda[i] = CLAMP(l, min, max);
- }
- }
- }
-
- /* Sample the texture (span->end fragments) */
- swrast->TextureSample[unit]( ctx, unit, texUnit->_Current,
- span->end, span->array->texcoords[unit],
- lambda, texels );
- }
- }
-
- /*
- * OK, now apply the texture (aka texture combine/blend).
- * We modify the span->color.rgba values.
- */
- for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
- if (ctx->Texture.Unit[unit]._ReallyEnabled) {
- const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
- if (texUnit->EnvMode == GL_COMBINE_EXT) {
- /* GL_ARB/EXT_texture_env_combine */
- texture_combine( ctx, unit, span->end,
- (CONST GLchan (*)[4]) primary_rgba,
- swrast->TexelBuffer,
- span->array->rgba );
- }
- else if (texUnit->EnvMode == GL_COMBINE4_NV) {
- /* GL_NV_texture_env_combine4 */
- texture_combine4( ctx, unit, span->end,
- (CONST GLchan (*)[4]) primary_rgba,
- swrast->TexelBuffer,
- span->array->rgba );
- }
- else {
- /* conventional texture blend */
- const GLchan (*texels)[4] = (const GLchan (*)[4])
- (swrast->TexelBuffer + unit *
- (span->end * 4 * sizeof(GLchan)));
- texture_apply( ctx, texUnit, span->end,
- (CONST GLchan (*)[4]) primary_rgba, texels,
- span->array->rgba );
- }
- }
+ if (texObj)
+ _swrast_unmap_texture(ctx, texObj);
}
}
projects / mesa.git / blobdiff