/*
* Mesa 3-D graphics library
- * Version: 6.5.2
+ * Version: 7.1
*
- * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
#include "context.h"
#include "image.h"
#include "imports.h"
-#include "histogram.h"
#include "macros.h"
#include "pixel.h"
#define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
+/**
+ * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
+ */
+static GLboolean
+_mesa_type_is_packed(GLenum type)
+{
+ switch (type) {
+ case GL_UNSIGNED_BYTE_3_3_2:
+ case GL_UNSIGNED_BYTE_2_3_3_REV:
+ case GL_UNSIGNED_SHORT_5_6_5:
+ case GL_UNSIGNED_SHORT_5_6_5_REV:
+ case GL_UNSIGNED_SHORT_4_4_4_4:
+ case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+ case GL_UNSIGNED_SHORT_5_5_5_1:
+ case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+ case GL_UNSIGNED_INT_8_8_8_8:
+ case GL_UNSIGNED_INT_8_8_8_8_REV:
+ case GL_UNSIGNED_INT_10_10_10_2:
+ case GL_UNSIGNED_INT_2_10_10_10_REV:
+ case GL_UNSIGNED_SHORT_8_8_MESA:
+ case GL_UNSIGNED_SHORT_8_8_REV_MESA:
+ case GL_UNSIGNED_INT_24_8_EXT:
+ return GL_TRUE;
+ }
+
+ return GL_FALSE;
+}
+
/**
* Flip the 8 bits in each byte of the given array.
*
static void
flip_bytes( GLubyte *p, GLuint n )
{
- register GLuint i, a, b;
-
- for (i=0;i<n;i++) {
+ GLuint i, a, b;
+ for (i = 0; i < n; i++) {
b = (GLuint) p[i]; /* words are often faster than bytes */
a = ((b & 0x01) << 7) |
((b & 0x02) << 5) |
void
_mesa_swap2( GLushort *p, GLuint n )
{
- register GLuint i;
-
- for (i=0;i<n;i++) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
}
}
void
_mesa_swap4( GLuint *p, GLuint n )
{
- register GLuint i, a, b;
-
- for (i=0;i<n;i++) {
+ GLuint i, a, b;
+ for (i = 0; i < n; i++) {
b = p[i];
a = (b >> 24)
| ((b >> 8) & 0xff00)
/**
- * Compute the stride between image rows.
+ * Compute the stride (in bytes) between image rows.
*
* \param packing the pixelstore attributes
* \param width image width.
* \param format pixel format.
* \param type pixel data type.
*
- * \return the stride in bytes for the given parameters.
+ * \return the stride in bytes for the given parameters, or -1 if error
*/
GLint
_mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLenum format, GLenum type )
{
+ GLint bytesPerRow, remainder;
+
ASSERT(packing);
+
if (type == GL_BITMAP) {
- /* BITMAP data */
- GLint bytes;
if (packing->RowLength == 0) {
- bytes = (width + 7) / 8;
+ bytesPerRow = (width + 7) / 8;
}
else {
- bytes = (packing->RowLength + 7) / 8;
- }
- if (packing->Invert) {
- /* negate the bytes per row (negative row stride) */
- bytes = -bytes;
+ bytesPerRow = (packing->RowLength + 7) / 8;
}
- return bytes;
}
else {
/* Non-BITMAP data */
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
- GLint bytesPerRow, remainder;
if (bytesPerPixel <= 0)
return -1; /* error */
if (packing->RowLength == 0) {
else {
bytesPerRow = bytesPerPixel * packing->RowLength;
}
- remainder = bytesPerRow % packing->Alignment;
- if (remainder > 0)
- bytesPerRow += (packing->Alignment - remainder);
- if (packing->Invert)
- bytesPerRow = -bytesPerRow;
- return bytesPerRow;
}
+
+ remainder = bytesPerRow % packing->Alignment;
+ if (remainder > 0) {
+ bytesPerRow += (packing->Alignment - remainder);
+ }
+
+ if (packing->Invert) {
+ /* negate the bytes per row (negative row stride) */
+ bytesPerRow = -bytesPerRow;
+ }
+
+ return bytesPerRow;
}
return NULL;
}
- if (packing->SkipPixels == 0) {
+ if ((packing->SkipPixels & 7) == 0) {
_mesa_memcpy( dst, src, width_in_bytes );
if (packing->LsbFirst) {
flip_bytes( dst, width_in_bytes );
if (!dst)
return;
- if (packing->SkipPixels == 0) {
+ if ((packing->SkipPixels & 7) == 0) {
_mesa_memcpy( dst, src, width_in_bytes );
if (packing->LsbFirst) {
flip_bytes( dst, width_in_bytes );
/* handling SkipPixels is a bit tricky (no pun intended!) */
GLint i;
if (packing->LsbFirst) {
- GLubyte srcMask = 1 << (packing->SkipPixels & 0x7);
- GLubyte dstMask = 128;
+ GLubyte srcMask = 128;
+ GLubyte dstMask = 1 << (packing->SkipPixels & 0x7);
const GLubyte *s = src;
GLubyte *d = dst;
*d = 0;
if (*s & srcMask) {
*d |= dstMask;
}
- if (srcMask == 128) {
- srcMask = 1;
+ if (srcMask == 1) {
+ srcMask = 128;
s++;
}
else {
- srcMask = srcMask << 1;
+ srcMask = srcMask >> 1;
}
- if (dstMask == 1) {
- dstMask = 128;
+ if (dstMask == 128) {
+ dstMask = 1;
d++;
*d = 0;
}
else {
- dstMask = dstMask >> 1;
+ dstMask = dstMask << 1;
}
}
}
else {
- GLubyte srcMask = 128 >> (packing->SkipPixels & 0x7);
- GLubyte dstMask = 128;
+ GLubyte srcMask = 128;
+ GLubyte dstMask = 128 >> (packing->SkipPixels & 0x7);
const GLubyte *s = src;
GLubyte *d = dst;
*d = 0;
}
+/**********************************************************************/
+/***** Pixel processing functions ******/
+/**********************************************************************/
+
+/*
+ * Apply scale and bias factors to an array of RGBA pixels.
+ */
+void
+_mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4],
+ GLfloat rScale, GLfloat gScale,
+ GLfloat bScale, GLfloat aScale,
+ GLfloat rBias, GLfloat gBias,
+ GLfloat bBias, GLfloat aBias)
+{
+ if (rScale != 1.0 || rBias != 0.0) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
+ }
+ }
+ if (gScale != 1.0 || gBias != 0.0) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
+ }
+ }
+ if (bScale != 1.0 || bBias != 0.0) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
+ }
+ }
+ if (aScale != 1.0 || aBias != 0.0) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
+ }
+ }
+}
+
+
+/*
+ * Apply pixel mapping to an array of floating point RGBA pixels.
+ */
+void
+_mesa_map_rgba( const GLcontext *ctx, GLuint n, GLfloat rgba[][4] )
+{
+ const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1);
+ const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1);
+ const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1);
+ const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1);
+ const GLfloat *rMap = ctx->PixelMaps.RtoR.Map;
+ const GLfloat *gMap = ctx->PixelMaps.GtoG.Map;
+ const GLfloat *bMap = ctx->PixelMaps.BtoB.Map;
+ const GLfloat *aMap = ctx->PixelMaps.AtoA.Map;
+ GLuint i;
+ for (i=0;i<n;i++) {
+ GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
+ GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
+ GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
+ GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
+ rgba[i][RCOMP] = rMap[IROUND(r * rscale)];
+ rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
+ rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
+ rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
+ }
+}
+
+
+/*
+ * Apply the color matrix and post color matrix scaling and biasing.
+ */
+void
+_mesa_transform_rgba(const GLcontext *ctx, GLuint n, GLfloat rgba[][4])
+{
+ const GLfloat rs = ctx->Pixel.PostColorMatrixScale[0];
+ const GLfloat rb = ctx->Pixel.PostColorMatrixBias[0];
+ const GLfloat gs = ctx->Pixel.PostColorMatrixScale[1];
+ const GLfloat gb = ctx->Pixel.PostColorMatrixBias[1];
+ const GLfloat bs = ctx->Pixel.PostColorMatrixScale[2];
+ const GLfloat bb = ctx->Pixel.PostColorMatrixBias[2];
+ const GLfloat as = ctx->Pixel.PostColorMatrixScale[3];
+ const GLfloat ab = ctx->Pixel.PostColorMatrixBias[3];
+ const GLfloat *m = ctx->ColorMatrixStack.Top->m;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ const GLfloat r = rgba[i][RCOMP];
+ const GLfloat g = rgba[i][GCOMP];
+ const GLfloat b = rgba[i][BCOMP];
+ const GLfloat a = rgba[i][ACOMP];
+ rgba[i][RCOMP] = (m[0] * r + m[4] * g + m[ 8] * b + m[12] * a) * rs + rb;
+ rgba[i][GCOMP] = (m[1] * r + m[5] * g + m[ 9] * b + m[13] * a) * gs + gb;
+ rgba[i][BCOMP] = (m[2] * r + m[6] * g + m[10] * b + m[14] * a) * bs + bb;
+ rgba[i][ACOMP] = (m[3] * r + m[7] * g + m[11] * b + m[15] * a) * as + ab;
+ }
+}
+
+
+/**
+ * Apply a color table lookup to an array of floating point RGBA colors.
+ */
+void
+_mesa_lookup_rgba_float(const struct gl_color_table *table,
+ GLuint n, GLfloat rgba[][4])
+{
+ const GLint max = table->Size - 1;
+ const GLfloat scale = (GLfloat) max;
+ const GLfloat *lut = table->TableF;
+ GLuint i;
+
+ if (!table->TableF || table->Size == 0)
+ return;
+
+ switch (table->_BaseFormat) {
+ case GL_INTENSITY:
+ /* replace RGBA with I */
+ for (i = 0; i < n; i++) {
+ GLint j = IROUND(rgba[i][RCOMP] * scale);
+ GLfloat c = lut[CLAMP(j, 0, max)];
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] =
+ rgba[i][ACOMP] = c;
+ }
+ break;
+ case GL_LUMINANCE:
+ /* replace RGB with L */
+ for (i = 0; i < n; i++) {
+ GLint j = IROUND(rgba[i][RCOMP] * scale);
+ GLfloat c = lut[CLAMP(j, 0, max)];
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] = c;
+ }
+ break;
+ case GL_ALPHA:
+ /* replace A with A */
+ for (i = 0; i < n; i++) {
+ GLint j = IROUND(rgba[i][ACOMP] * scale);
+ rgba[i][ACOMP] = lut[CLAMP(j, 0, max)];
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ /* replace RGBA with LLLA */
+ for (i = 0; i < n; i++) {
+ GLint jL = IROUND(rgba[i][RCOMP] * scale);
+ GLint jA = IROUND(rgba[i][ACOMP] * scale);
+ GLfloat luminance, alpha;
+ jL = CLAMP(jL, 0, max);
+ jA = CLAMP(jA, 0, max);
+ luminance = lut[jL * 2 + 0];
+ alpha = lut[jA * 2 + 1];
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] = luminance;
+ rgba[i][ACOMP] = alpha;;
+ }
+ break;
+ case GL_RGB:
+ /* replace RGB with RGB */
+ for (i = 0; i < n; i++) {
+ GLint jR = IROUND(rgba[i][RCOMP] * scale);
+ GLint jG = IROUND(rgba[i][GCOMP] * scale);
+ GLint jB = IROUND(rgba[i][BCOMP] * scale);
+ jR = CLAMP(jR, 0, max);
+ jG = CLAMP(jG, 0, max);
+ jB = CLAMP(jB, 0, max);
+ rgba[i][RCOMP] = lut[jR * 3 + 0];
+ rgba[i][GCOMP] = lut[jG * 3 + 1];
+ rgba[i][BCOMP] = lut[jB * 3 + 2];
+ }
+ break;
+ case GL_RGBA:
+ /* replace RGBA with RGBA */
+ for (i = 0; i < n; i++) {
+ GLint jR = IROUND(rgba[i][RCOMP] * scale);
+ GLint jG = IROUND(rgba[i][GCOMP] * scale);
+ GLint jB = IROUND(rgba[i][BCOMP] * scale);
+ GLint jA = IROUND(rgba[i][ACOMP] * scale);
+ jR = CLAMP(jR, 0, max);
+ jG = CLAMP(jG, 0, max);
+ jB = CLAMP(jB, 0, max);
+ jA = CLAMP(jA, 0, max);
+ rgba[i][RCOMP] = lut[jR * 4 + 0];
+ rgba[i][GCOMP] = lut[jG * 4 + 1];
+ rgba[i][BCOMP] = lut[jB * 4 + 2];
+ rgba[i][ACOMP] = lut[jA * 4 + 3];
+ }
+ break;
+ default:
+ _mesa_problem(NULL, "Bad format in _mesa_lookup_rgba_float");
+ return;
+ }
+}
+
+
+
+/**
+ * Apply a color table lookup to an array of ubyte/RGBA colors.
+ */
+void
+_mesa_lookup_rgba_ubyte(const struct gl_color_table *table,
+ GLuint n, GLubyte rgba[][4])
+{
+ const GLubyte *lut = table->TableUB;
+ const GLfloat scale = (GLfloat) (table->Size - 1) / (GLfloat)255.0;
+ GLuint i;
+
+ if (!table->TableUB || table->Size == 0)
+ return;
+
+ switch (table->_BaseFormat) {
+ case GL_INTENSITY:
+ /* replace RGBA with I */
+ if (table->Size == 256) {
+ for (i = 0; i < n; i++) {
+ const GLubyte c = lut[rgba[i][RCOMP]];
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] =
+ rgba[i][ACOMP] = c;
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ GLint j = IROUND((GLfloat) rgba[i][RCOMP] * scale);
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] =
+ rgba[i][ACOMP] = lut[j];
+ }
+ }
+ break;
+ case GL_LUMINANCE:
+ /* replace RGB with L */
+ if (table->Size == 256) {
+ for (i = 0; i < n; i++) {
+ const GLubyte c = lut[rgba[i][RCOMP]];
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] = c;
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ GLint j = IROUND((GLfloat) rgba[i][RCOMP] * scale);
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] = lut[j];
+ }
+ }
+ break;
+ case GL_ALPHA:
+ /* replace A with A */
+ if (table->Size == 256) {
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = lut[rgba[i][ACOMP]];
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ GLint j = IROUND((GLfloat) rgba[i][ACOMP] * scale);
+ rgba[i][ACOMP] = lut[j];
+ }
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ /* replace RGBA with LLLA */
+ if (table->Size == 256) {
+ for (i = 0; i < n; i++) {
+ GLubyte l = lut[rgba[i][RCOMP] * 2 + 0];
+ GLubyte a = lut[rgba[i][ACOMP] * 2 + 1];;
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] = l;
+ rgba[i][ACOMP] = a;
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ GLint jL = IROUND((GLfloat) rgba[i][RCOMP] * scale);
+ GLint jA = IROUND((GLfloat) rgba[i][ACOMP] * scale);
+ GLubyte luminance = lut[jL * 2 + 0];
+ GLubyte alpha = lut[jA * 2 + 1];
+ rgba[i][RCOMP] =
+ rgba[i][GCOMP] =
+ rgba[i][BCOMP] = luminance;
+ rgba[i][ACOMP] = alpha;
+ }
+ }
+ break;
+ case GL_RGB:
+ if (table->Size == 256) {
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = lut[rgba[i][RCOMP] * 3 + 0];
+ rgba[i][GCOMP] = lut[rgba[i][GCOMP] * 3 + 1];
+ rgba[i][BCOMP] = lut[rgba[i][BCOMP] * 3 + 2];
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ GLint jR = IROUND((GLfloat) rgba[i][RCOMP] * scale);
+ GLint jG = IROUND((GLfloat) rgba[i][GCOMP] * scale);
+ GLint jB = IROUND((GLfloat) rgba[i][BCOMP] * scale);
+ rgba[i][RCOMP] = lut[jR * 3 + 0];
+ rgba[i][GCOMP] = lut[jG * 3 + 1];
+ rgba[i][BCOMP] = lut[jB * 3 + 2];
+ }
+ }
+ break;
+ case GL_RGBA:
+ if (table->Size == 256) {
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = lut[rgba[i][RCOMP] * 4 + 0];
+ rgba[i][GCOMP] = lut[rgba[i][GCOMP] * 4 + 1];
+ rgba[i][BCOMP] = lut[rgba[i][BCOMP] * 4 + 2];
+ rgba[i][ACOMP] = lut[rgba[i][ACOMP] * 4 + 3];
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ GLint jR = IROUND((GLfloat) rgba[i][RCOMP] * scale);
+ GLint jG = IROUND((GLfloat) rgba[i][GCOMP] * scale);
+ GLint jB = IROUND((GLfloat) rgba[i][BCOMP] * scale);
+ GLint jA = IROUND((GLfloat) rgba[i][ACOMP] * scale);
+ CLAMPED_FLOAT_TO_CHAN(rgba[i][RCOMP], lut[jR * 4 + 0]);
+ CLAMPED_FLOAT_TO_CHAN(rgba[i][GCOMP], lut[jG * 4 + 1]);
+ CLAMPED_FLOAT_TO_CHAN(rgba[i][BCOMP], lut[jB * 4 + 2]);
+ CLAMPED_FLOAT_TO_CHAN(rgba[i][ACOMP], lut[jA * 4 + 3]);
+ }
+ }
+ break;
+ default:
+ _mesa_problem(NULL, "Bad format in _mesa_lookup_rgba_chan");
+ return;
+ }
+}
+
+
+
+/*
+ * Map color indexes to float rgba values.
+ */
+void
+_mesa_map_ci_to_rgba( const GLcontext *ctx, GLuint n,
+ const GLuint index[], GLfloat rgba[][4] )
+{
+ GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
+ GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
+ GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
+ GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
+ const GLfloat *rMap = ctx->PixelMaps.ItoR.Map;
+ const GLfloat *gMap = ctx->PixelMaps.ItoG.Map;
+ const GLfloat *bMap = ctx->PixelMaps.ItoB.Map;
+ const GLfloat *aMap = ctx->PixelMaps.ItoA.Map;
+ GLuint i;
+ for (i=0;i<n;i++) {
+ rgba[i][RCOMP] = rMap[index[i] & rmask];
+ rgba[i][GCOMP] = gMap[index[i] & gmask];
+ rgba[i][BCOMP] = bMap[index[i] & bmask];
+ rgba[i][ACOMP] = aMap[index[i] & amask];
+ }
+}
+
+
+/**
+ * Map ubyte color indexes to ubyte/RGBA values.
+ */
+void
+_mesa_map_ci8_to_rgba8(const GLcontext *ctx, GLuint n, const GLubyte index[],
+ GLubyte rgba[][4])
+{
+ GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
+ GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
+ GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
+ GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
+ const GLubyte *rMap = ctx->PixelMaps.ItoR.Map8;
+ const GLubyte *gMap = ctx->PixelMaps.ItoG.Map8;
+ const GLubyte *bMap = ctx->PixelMaps.ItoB.Map8;
+ const GLubyte *aMap = ctx->PixelMaps.ItoA.Map8;
+ GLuint i;
+ for (i=0;i<n;i++) {
+ rgba[i][RCOMP] = rMap[index[i] & rmask];
+ rgba[i][GCOMP] = gMap[index[i] & gmask];
+ rgba[i][BCOMP] = bMap[index[i] & bmask];
+ rgba[i][ACOMP] = aMap[index[i] & amask];
+ }
+}
+
+
+void
+_mesa_scale_and_bias_depth(const GLcontext *ctx, GLuint n,
+ GLfloat depthValues[])
+{
+ const GLfloat scale = ctx->Pixel.DepthScale;
+ const GLfloat bias = ctx->Pixel.DepthBias;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ GLfloat d = depthValues[i] * scale + bias;
+ depthValues[i] = CLAMP(d, 0.0F, 1.0F);
+ }
+}
+
+
+void
+_mesa_scale_and_bias_depth_uint(const GLcontext *ctx, GLuint n,
+ GLuint depthValues[])
+{
+ const GLdouble max = (double) 0xffffffff;
+ const GLdouble scale = ctx->Pixel.DepthScale;
+ const GLdouble bias = ctx->Pixel.DepthBias * max;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ GLdouble d = (GLdouble) depthValues[i] * scale + bias;
+ d = CLAMP(d, 0.0, max);
+ depthValues[i] = (GLuint) d;
+ }
+}
+
+
+
+/*
+ * Update the min/max values from an array of fragment colors.
+ */
+static void
+update_minmax(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ /* update mins */
+ if (rgba[i][RCOMP] < ctx->MinMax.Min[RCOMP])
+ ctx->MinMax.Min[RCOMP] = rgba[i][RCOMP];
+ if (rgba[i][GCOMP] < ctx->MinMax.Min[GCOMP])
+ ctx->MinMax.Min[GCOMP] = rgba[i][GCOMP];
+ if (rgba[i][BCOMP] < ctx->MinMax.Min[BCOMP])
+ ctx->MinMax.Min[BCOMP] = rgba[i][BCOMP];
+ if (rgba[i][ACOMP] < ctx->MinMax.Min[ACOMP])
+ ctx->MinMax.Min[ACOMP] = rgba[i][ACOMP];
+
+ /* update maxs */
+ if (rgba[i][RCOMP] > ctx->MinMax.Max[RCOMP])
+ ctx->MinMax.Max[RCOMP] = rgba[i][RCOMP];
+ if (rgba[i][GCOMP] > ctx->MinMax.Max[GCOMP])
+ ctx->MinMax.Max[GCOMP] = rgba[i][GCOMP];
+ if (rgba[i][BCOMP] > ctx->MinMax.Max[BCOMP])
+ ctx->MinMax.Max[BCOMP] = rgba[i][BCOMP];
+ if (rgba[i][ACOMP] > ctx->MinMax.Max[ACOMP])
+ ctx->MinMax.Max[ACOMP] = rgba[i][ACOMP];
+ }
+}
+
+
+/*
+ * Update the histogram values from an array of fragment colors.
+ */
+static void
+update_histogram(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+ const GLint max = ctx->Histogram.Width - 1;
+ GLfloat w = (GLfloat) max;
+ GLuint i;
+
+ if (ctx->Histogram.Width == 0)
+ return;
+
+ for (i = 0; i < n; i++) {
+ GLint ri = IROUND(rgba[i][RCOMP] * w);
+ GLint gi = IROUND(rgba[i][GCOMP] * w);
+ GLint bi = IROUND(rgba[i][BCOMP] * w);
+ GLint ai = IROUND(rgba[i][ACOMP] * w);
+ ri = CLAMP(ri, 0, max);
+ gi = CLAMP(gi, 0, max);
+ bi = CLAMP(bi, 0, max);
+ ai = CLAMP(ai, 0, max);
+ ctx->Histogram.Count[ri][RCOMP]++;
+ ctx->Histogram.Count[gi][GCOMP]++;
+ ctx->Histogram.Count[bi][BCOMP]++;
+ ctx->Histogram.Count[ai][ACOMP]++;
+ }
+}
+
+
/**
* Apply various pixel transfer operations to an array of RGBA pixels
* as indicated by the transferOps bitmask
}
/* GL_COLOR_TABLE lookup */
if (transferOps & IMAGE_COLOR_TABLE_BIT) {
- _mesa_lookup_rgba_float(&ctx->ColorTable, n, rgba);
+ _mesa_lookup_rgba_float(&ctx->ColorTable[COLORTABLE_PRECONVOLUTION], n, rgba);
}
/* convolution */
if (transferOps & IMAGE_CONVOLUTION_BIT) {
}
/* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
- _mesa_lookup_rgba_float(&ctx->PostConvolutionColorTable, n, rgba);
+ _mesa_lookup_rgba_float(&ctx->ColorTable[COLORTABLE_POSTCONVOLUTION], n, rgba);
}
/* color matrix transform */
if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
}
/* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
- _mesa_lookup_rgba_float(&ctx->PostColorMatrixColorTable, n, rgba);
+ _mesa_lookup_rgba_float(&ctx->ColorTable[COLORTABLE_POSTCOLORMATRIX], n, rgba);
}
/* update histogram count */
if (transferOps & IMAGE_HISTOGRAM_BIT) {
- _mesa_update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
+ update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
/* update min/max values */
if (transferOps & IMAGE_MIN_MAX_BIT) {
- _mesa_update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
+ update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
/* clamping to [0,1] */
if (transferOps & IMAGE_CLAMP_BIT) {
shift_and_offset_ci(ctx, n, indexes);
}
if (transferOps & IMAGE_MAP_COLOR_BIT) {
- const GLuint mask = ctx->Pixel.MapItoIsize - 1;
+ const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
GLuint i;
for (i = 0; i < n; i++) {
const GLuint j = indexes[i] & mask;
- indexes[i] = IROUND(ctx->Pixel.MapItoI[j]);
+ indexes[i] = IROUND(ctx->PixelMaps.ItoI.Map[j]);
}
}
}
}
}
if (ctx->Pixel.MapStencilFlag) {
- GLuint mask = ctx->Pixel.MapStoSsize - 1;
+ GLuint mask = ctx->PixelMaps.StoS.Size - 1;
GLuint i;
for (i = 0; i < n; i++) {
- stencil[i] = ctx->Pixel.MapStoS[ stencil[i] & mask ];
+ stencil[i] = (GLstencil)ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
}
}
}
if (dstFormat == GL_LUMINANCE || dstFormat == GL_LUMINANCE_ALPHA) {
/* compute luminance values */
- if (transferOps & IMAGE_RED_TO_LUMINANCE) {
- /* Luminance = Red (glGetTexImage) */
+ if (transferOps & IMAGE_CLAMP_BIT) {
for (i = 0; i < n; i++) {
- luminance[i] = rgba[i][RCOMP];
+ GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ luminance[i] = CLAMP(sum, 0.0F, 1.0F);
}
}
else {
- /* Luminance = Red + Green + Blue (glReadPixels) */
- if (dstType != GL_FLOAT || ctx->Color.ClampReadColor == GL_TRUE) {
- for (i = 0; i < n; i++) {
- GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
- luminance[i] = CLAMP(sum, 0.0F, 1.0F);
- }
- }
- else {
- for (i = 0; i < n; i++) {
- luminance[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
- }
+ for (i = 0; i < n; i++) {
+ luminance[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
}
}
}
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
- if (dstPacking->SwapBytes) {
- _mesa_swap2( (GLushort *) dst, n * comps);
- }
}
break;
case GL_SHORT:
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
- if (dstPacking->SwapBytes) {
- _mesa_swap2( (GLushort *) dst, n * comps );
- }
}
break;
case GL_UNSIGNED_INT:
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
- if (dstPacking->SwapBytes) {
- _mesa_swap4( (GLuint *) dst, n * comps );
- }
}
break;
case GL_INT:
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
- if (dstPacking->SwapBytes) {
- _mesa_swap4( (GLuint *) dst, n * comps );
- }
}
break;
case GL_FLOAT:
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
- if (dstPacking->SwapBytes) {
- _mesa_swap4( (GLuint *) dst, n * comps );
- }
}
break;
case GL_HALF_FLOAT_ARB:
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
- if (dstPacking->SwapBytes) {
- _mesa_swap2( (GLushort *) dst, n * comps );
- }
}
break;
case GL_UNSIGNED_BYTE_3_3_2:
break;
default:
_mesa_problem(ctx, "bad type in _mesa_pack_rgba_span_float");
+ return;
+ }
+
+ if (dstPacking->SwapBytes) {
+ GLint swapSize = _mesa_sizeof_packed_type(dstType);
+ if (swapSize == 2) {
+ if (dstPacking->SwapBytes) {
+ _mesa_swap2((GLushort *) dstAddr, n * comps);
+ }
+ }
+ else if (swapSize == 4) {
+ if (dstPacking->SwapBytes) {
+ _mesa_swap4((GLuint *) dstAddr, n * comps);
+ }
+ }
}
}
* Try simple cases first
*/
if (transferOps == 0 &&
+ !ctx->Pixel.MapStencilFlag &&
srcType == GL_UNSIGNED_BYTE &&
dstType == GL_UNSIGNED_BYTE) {
_mesa_memcpy(dest, source, n * sizeof(GLubyte));
}
else if (transferOps == 0 &&
+ !ctx->Pixel.MapStencilFlag &&
srcType == GL_UNSIGNED_INT &&
dstType == GL_UNSIGNED_INT &&
!srcPacking->SwapBytes) {
extract_uint_indexes(n, indexes, GL_STENCIL_INDEX, srcType, source,
srcPacking);
- if (transferOps) {
- if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
- /* shift and offset indexes */
- shift_and_offset_ci(ctx, n, indexes);
- }
+ if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
+ /* shift and offset indexes */
+ shift_and_offset_ci(ctx, n, indexes);
+ }
- if (ctx->Pixel.MapStencilFlag) {
- /* Apply stencil lookup table */
- GLuint mask = ctx->Pixel.MapStoSsize - 1;
- GLuint i;
- for (i=0;i<n;i++) {
- indexes[i] = ctx->Pixel.MapStoS[ indexes[i] & mask ];
- }
+ if (ctx->Pixel.MapStencilFlag) {
+ /* Apply stencil lookup table */
+ const GLuint mask = ctx->PixelMaps.StoS.Size - 1;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ indexes[i] = (GLuint)ctx->PixelMaps.StoS.Map[ indexes[i] & mask ];
}
}
switch (dstType) {
case GL_UNSIGNED_BYTE:
- if (sizeof(GLstencil) == 8) {
+ if (sizeof(GLstencil) == 1) {
_mesa_memcpy( dest, source, n );
}
else {
}
break;
case GL_BYTE:
- if (sizeof(GLstencil) == 8) {
- _mesa_memcpy( dest, source, n );
- }
- else {
+ {
GLbyte *dst = (GLbyte *) dest;
GLuint i;
for (i=0;i<n;i++) {
- dst[i] = (GLbyte) source[i];
+ dst[i] = (GLbyte) (source[i] & 0x7f);
}
}
break;
GLint *dst = (GLint *) dest;
GLuint i;
for (i=0;i<n;i++) {
- *dst++ = (GLint) source[i];
+ dst[i] = (GLint) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
+#define DEPTH_VALUES(GLTYPE, GLTYPE2FLOAT) \
+ do { \
+ GLuint i; \
+ const GLTYPE *src = (const GLTYPE *)source; \
+ for (i = 0; i < n; i++) { \
+ GLTYPE value = src[i]; \
+ if (srcPacking->SwapBytes) { \
+ if (sizeof(GLTYPE) == 2) { \
+ SWAP2BYTE(value); \
+ } else if (sizeof(GLTYPE) == 4) { \
+ SWAP4BYTE(value); \
+ } \
+ } \
+ depthValues[i] = GLTYPE2FLOAT(value); \
+ } \
+ } while (0)
+
+/**
+ * Unpack a row of depth/z values from memory, returning GLushort, GLuint
+ * or GLfloat values.
+ * The glPixelTransfer (scale/bias) params will be applied.
+ *
+ * \param dstType one of GL_UNSIGNED_SHORT, GL_UNSIGNED_INT, GL_FLOAT
+ * \param depthMax max value for returned GLushort or GLuint values
+ * (ignored for GLfloat).
+ */
void
_mesa_unpack_depth_span( const GLcontext *ctx, GLuint n,
- GLenum dstType, GLvoid *dest, GLfloat depthScale,
+ GLenum dstType, GLvoid *dest, GLuint depthMax,
GLenum srcType, const GLvoid *source,
const struct gl_pixelstore_attrib *srcPacking )
{
GLfloat depthTemp[MAX_WIDTH], *depthValues;
+ GLboolean needClamp = GL_FALSE;
+
+ /* Look for special cases first.
+ * Not only are these faster, they're less prone to numeric conversion
+ * problems. Otherwise, converting from an int type to a float then
+ * back to an int type can introduce errors that will show up as
+ * artifacts in things like depth peeling which uses glCopyTexImage.
+ */
+ if (ctx->Pixel.DepthScale == 1.0 && ctx->Pixel.DepthBias == 0.0) {
+ if (srcType == GL_UNSIGNED_INT && dstType == GL_UNSIGNED_SHORT) {
+ const GLuint *src = (const GLuint *) source;
+ GLushort *dst = (GLushort *) dest;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = src[i] >> 16;
+ }
+ return;
+ }
+ if (srcType == GL_UNSIGNED_SHORT
+ && dstType == GL_UNSIGNED_INT
+ && depthMax == 0xffffffff) {
+ const GLushort *src = (const GLushort *) source;
+ GLuint *dst = (GLuint *) dest;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = src[i] | (src[i] << 16);
+ }
+ return;
+ }
+ /* XXX may want to add additional cases here someday */
+ }
+
+ /* general case path follows */
if (dstType == GL_FLOAT) {
depthValues = (GLfloat *) dest;
depthValues = depthTemp;
}
- /* XXX we need to obey srcPacking->SwapBytes here!!! */
- (void) srcPacking;
-
+ /* Convert incoming values to GLfloat. Some conversions will require
+ * clamping, below.
+ */
switch (srcType) {
case GL_BYTE:
- {
- GLuint i;
- const GLubyte *src = (const GLubyte *) source;
- for (i = 0; i < n; i++) {
- depthValues[i] = BYTE_TO_FLOAT(src[i]);
- }
- }
+ DEPTH_VALUES(GLbyte, BYTE_TO_FLOAT);
+ needClamp = GL_TRUE;
break;
case GL_UNSIGNED_BYTE:
- {
- GLuint i;
- const GLubyte *src = (const GLubyte *) source;
- for (i = 0; i < n; i++) {
- depthValues[i] = UBYTE_TO_FLOAT(src[i]);
- }
- }
+ DEPTH_VALUES(GLubyte, UBYTE_TO_FLOAT);
break;
case GL_SHORT:
- {
- GLuint i;
- const GLshort *src = (const GLshort *) source;
- for (i = 0; i < n; i++) {
- depthValues[i] = SHORT_TO_FLOAT(src[i]);
- }
- }
+ DEPTH_VALUES(GLshort, SHORT_TO_FLOAT);
+ needClamp = GL_TRUE;
break;
case GL_UNSIGNED_SHORT:
- {
- GLuint i;
- const GLushort *src = (const GLushort *) source;
- for (i = 0; i < n; i++) {
- depthValues[i] = USHORT_TO_FLOAT(src[i]);
- }
- }
+ DEPTH_VALUES(GLushort, USHORT_TO_FLOAT);
break;
case GL_INT:
- {
- GLuint i;
- const GLint *src = (const GLint *) source;
- for (i = 0; i < n; i++) {
- depthValues[i] = INT_TO_FLOAT(src[i]);
- }
- }
+ DEPTH_VALUES(GLint, INT_TO_FLOAT);
+ needClamp = GL_TRUE;
break;
case GL_UNSIGNED_INT:
- {
- GLuint i;
- const GLuint *src = (const GLuint *) source;
- for (i = 0; i < n; i++) {
- depthValues[i] = UINT_TO_FLOAT(src[i]);
- }
- }
+ DEPTH_VALUES(GLuint, UINT_TO_FLOAT);
break;
case GL_UNSIGNED_INT_24_8_EXT: /* GL_EXT_packed_depth_stencil */
- if (dstType == GL_UNSIGNED_INT &&
- depthScale == (GLfloat) 0xffffff &&
+ if (dstType == GL_UNSIGNED_INT_24_8_EXT &&
+ depthMax == 0xffffff &&
ctx->Pixel.DepthScale == 1.0 &&
ctx->Pixel.DepthBias == 0.0) {
const GLuint *src = (const GLuint *) source;
GLuint *zValues = (GLuint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
- zValues[i] = src[i] & 0xffffff00;
+ GLuint value = src[i];
+ if (srcPacking->SwapBytes) {
+ SWAP4BYTE(value);
+ }
+ zValues[i] = value & 0xffffff00;
}
return;
}
const GLfloat scale = 1.0f / 0xffffff;
GLuint i;
for (i = 0; i < n; i++) {
- depthValues[i] = (src[i] >> 8) * scale;
+ GLuint value = src[i];
+ if (srcPacking->SwapBytes) {
+ SWAP4BYTE(value);
+ }
+ depthValues[i] = (value >> 8) * scale;
}
}
break;
case GL_FLOAT:
- _mesa_memcpy(depthValues, source, n * sizeof(GLfloat));
+ DEPTH_VALUES(GLfloat, 1*);
+ needClamp = GL_TRUE;
break;
case GL_HALF_FLOAT_ARB:
{
GLuint i;
const GLhalfARB *src = (const GLhalfARB *) source;
for (i = 0; i < n; i++) {
- depthValues[i] = _mesa_half_to_float(src[i]);
+ GLhalfARB value = src[i];
+ if (srcPacking->SwapBytes) {
+ SWAP2BYTE(value);
+ }
+ depthValues[i] = _mesa_half_to_float(value);
}
+ needClamp = GL_TRUE;
}
break;
default:
return;
}
+ /* apply depth scale and bias */
+ {
+ const GLfloat scale = ctx->Pixel.DepthScale;
+ const GLfloat bias = ctx->Pixel.DepthBias;
+ if (scale != 1.0 || bias != 0.0) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ depthValues[i] = depthValues[i] * scale + bias;
+ }
+ needClamp = GL_TRUE;
+ }
+ }
- /* apply depth scale and bias and clamp to [0,1] */
- if (ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0) {
- _mesa_scale_and_bias_depth(ctx, n, depthValues);
+ /* clamp to [0, 1] */
+ if (needClamp) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ depthValues[i] = (GLfloat)CLAMP(depthValues[i], 0.0, 1.0);
+ }
}
+ /*
+ * Convert values to dstType
+ */
if (dstType == GL_UNSIGNED_INT) {
GLuint *zValues = (GLuint *) dest;
GLuint i;
- if (depthScale <= (GLfloat) 0xffffff) {
+ if (depthMax <= 0xffffff) {
/* no overflow worries */
for (i = 0; i < n; i++) {
- zValues[i] = (GLuint) (depthValues[i] * depthScale);
+ zValues[i] = (GLuint) (depthValues[i] * (GLfloat) depthMax);
}
}
else {
/* need to use double precision to prevent overflow problems */
for (i = 0; i < n; i++) {
- GLdouble z = depthValues[i] * depthScale;
+ GLdouble z = depthValues[i] * (GLfloat) depthMax;
if (z >= (GLdouble) 0xffffffff)
zValues[i] = 0xffffffff;
else
else if (dstType == GL_UNSIGNED_SHORT) {
GLushort *zValues = (GLushort *) dest;
GLuint i;
- ASSERT(depthScale <= 65535.0);
+ ASSERT(depthMax <= 0xffff);
for (i = 0; i < n; i++) {
- zValues[i] = (GLushort) (depthValues[i] * depthScale);
+ zValues[i] = (GLushort) (depthValues[i] * (GLfloat) depthMax);
}
}
else {
ASSERT(dstType == GL_FLOAT);
- ASSERT(depthScale == 1.0F);
+ /*ASSERT(depthMax == 1.0F);*/
}
}
if (type == GL_BITMAP) {
bytesPerRow = (width + 7) >> 3;
- flipBytes = !unpack->LsbFirst;
+ flipBytes = unpack->LsbFirst;
swap2 = swap4 = GL_FALSE;
compsPerRow = 0;
}
else {
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
- const GLint components = _mesa_components_in_format(format);
+ GLint components = _mesa_components_in_format(format);
GLint bytesPerComp;
+
+ if (_mesa_type_is_packed(type))
+ components = 1;
+
if (bytesPerPixel <= 0 || components <= 0)
return NULL; /* bad format or type. generate error later */
bytesPerRow = bytesPerPixel * width;
for (row = 0; row < height; row++) {
const GLvoid *src = _mesa_image_address(dimensions, unpack, pixels,
width, height, format, type, img, row, 0);
- _mesa_memcpy(dst, src, bytesPerRow);
+
+ if ((type == GL_BITMAP) && (unpack->SkipPixels & 0x7)) {
+ GLint i;
+ flipBytes = GL_FALSE;
+ if (unpack->LsbFirst) {
+ GLubyte srcMask = 1 << (unpack->SkipPixels & 0x7);
+ GLubyte dstMask = 128;
+ const GLubyte *s = src;
+ GLubyte *d = dst;
+ *d = 0;
+ for (i = 0; i < width; i++) {
+ if (*s & srcMask) {
+ *d |= dstMask;
+ }
+ if (srcMask == 128) {
+ srcMask = 1;
+ s++;
+ }
+ else {
+ srcMask = srcMask << 1;
+ }
+ if (dstMask == 1) {
+ dstMask = 128;
+ d++;
+ *d = 0;
+ }
+ else {
+ dstMask = dstMask >> 1;
+ }
+ }
+ }
+ else {
+ GLubyte srcMask = 128 >> (unpack->SkipPixels & 0x7);
+ GLubyte dstMask = 128;
+ const GLubyte *s = src;
+ GLubyte *d = dst;
+ *d = 0;
+ for (i = 0; i < width; i++) {
+ if (*s & srcMask) {
+ *d |= dstMask;
+ }
+ if (srcMask == 1) {
+ srcMask = 128;
+ s++;
+ }
+ else {
+ srcMask = srcMask >> 1;
+ }
+ if (dstMask == 1) {
+ dstMask = 128;
+ d++;
+ *d = 0;
+ }
+ else {
+ dstMask = dstMask >> 1;
+ }
+ }
+ }
+ }
+ else {
+ _mesa_memcpy(dst, src, bytesPerRow);
+ }
+
/* byte flipping/swapping */
if (flipBytes) {
flip_bytes((GLubyte *) dst, bytesPerRow);
}
+/**
+ * Do clipping for a glCopyTexSubImage call.
+ * The framebuffer source region might extend outside the framebuffer
+ * bounds. Clip the source region against the framebuffer bounds and
+ * adjust the texture/dest position and size accordingly.
+ *
+ * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
+ */
+GLboolean
+_mesa_clip_copytexsubimage(const GLcontext *ctx,
+ GLint *destX, GLint *destY,
+ GLint *srcX, GLint *srcY,
+ GLsizei *width, GLsizei *height)
+{
+ const struct gl_framebuffer *fb = ctx->ReadBuffer;
+ const GLint srcX0 = *srcX, srcY0 = *srcY;
+
+ if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
+ srcX, srcY, width, height)) {
+ *destX = *destX + *srcX - srcX0;
+ *destY = *destY + *srcY - srcY0;
+
+ return GL_TRUE;
+ }
+ else {
+ return GL_FALSE;
+ }
+}
+
+
+
/**
* Clip the rectangle defined by (x, y, width, height) against the bounds
* specified by [xmin, xmax) and [ymin, ymax).
projects / mesa.git / blobdiff