/*
* Mesa 3-D graphics library
- * Version: 7.0.3
+ * Version: 7.3
*
- * Copyright (C) 1999-2007 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 "glheader.h"
-#include "context.h"
-#include "colormac.h"
-#include "imports.h"
-#include "texformat.h"
+#include "main/glheader.h"
+#include "main/context.h"
+#include "main/colormac.h"
+#include "main/imports.h"
+#include "main/texformat.h"
#include "s_context.h"
#include "s_texfilter.h"
-/**
- * Constants for integer linear interpolation.
+/*
+ * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
+ * see 1-pixel bands of improperly weighted linear-filtered textures.
+ * 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 ILERP_SCALE 65536.0F
-#define ILERP_SHIFT 16
+#define FRAC(f) ((f) - IFLOOR(f))
+
/**
- * Linear interpolation macros
+ * Linear interpolation macro
*/
#define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
-#define ILERP(IT, A, B) ( (A) + (((IT) * ((B) - (A))) >> ILERP_SHIFT) )
/**
}
-/**
- * Do 2D/biliner interpolation of integer values.
- * \sa lerp_2d
- */
-static INLINE GLint
-ilerp_2d(GLint ia, GLint ib,
- GLint v00, GLint v10, GLint v01, GLint v11)
-{
- /* fixed point interpolants in [0, ILERP_SCALE] */
- const GLint temp0 = ILERP(ia, v00, v10);
- const GLint temp1 = ILERP(ia, v01, v11);
- return ILERP(ib, temp0, temp1);
-}
-
-
/**
* Do 3D/trilinear interpolation of float values.
* \sa lerp_2d
}
-/**
- * Do 3D/trilinear interpolation of integer values.
- * \sa lerp_2d
- */
-static INLINE GLint
-ilerp_3d(GLint ia, GLint ib, GLint ic,
- GLint v000, GLint v100, GLint v010, GLint v110,
- GLint v001, GLint v101, GLint v011, GLint v111)
-{
- /* fixed point interpolants in [0, ILERP_SCALE] */
- const GLint temp00 = ILERP(ia, v000, v100);
- const GLint temp10 = ILERP(ia, v010, v110);
- const GLint temp01 = ILERP(ia, v001, v101);
- const GLint temp11 = ILERP(ia, v011, v111);
- const GLint temp0 = ILERP(ib, temp00, temp10);
- const GLint temp1 = ILERP(ib, temp01, temp11);
- return ILERP(ic, temp0, temp1);
-}
-
-
/**
* Do linear interpolation of colors.
*/
static INLINE void
-lerp_rgba(GLchan result[4], GLfloat t, const GLchan a[4], const GLchan b[4])
+lerp_rgba(GLfloat result[4], GLfloat t, const GLfloat a[4], const GLfloat b[4])
{
-#if CHAN_TYPE == GL_FLOAT
result[0] = LERP(t, a[0], b[0]);
result[1] = LERP(t, a[1], b[1]);
result[2] = LERP(t, a[2], b[2]);
result[3] = LERP(t, a[3], b[3]);
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- result[0] = (GLchan) (LERP(t, a[0], b[0]) + 0.5);
- result[1] = (GLchan) (LERP(t, a[1], b[1]) + 0.5);
- result[2] = (GLchan) (LERP(t, a[2], b[2]) + 0.5);
- result[3] = (GLchan) (LERP(t, a[3], b[3]) + 0.5);
-#else
- /* fixed point interpolants in [0, ILERP_SCALE] */
- const GLint it = IROUND_POS(t * ILERP_SCALE);
- ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
- result[0] = ILERP(it, a[0], b[0]);
- result[1] = ILERP(it, a[1], b[1]);
- result[2] = ILERP(it, a[2], b[2]);
- result[3] = ILERP(it, a[3], b[3]);
-#endif
}
* Do bilinear interpolation of colors.
*/
static INLINE void
-lerp_rgba_2d(GLchan result[4], GLfloat a, GLfloat b,
- const GLchan t00[4], const GLchan t10[4],
- const GLchan t01[4], const GLchan t11[4])
+lerp_rgba_2d(GLfloat result[4], GLfloat a, GLfloat b,
+ const GLfloat t00[4], const GLfloat t10[4],
+ const GLfloat t01[4], const GLfloat t11[4])
{
-#if CHAN_TYPE == GL_FLOAT
result[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
result[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
result[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
result[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- result[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
- result[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
- result[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
- result[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
-#else
- const GLint ia = IROUND_POS(a * ILERP_SCALE);
- const GLint ib = IROUND_POS(b * ILERP_SCALE);
- ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
- result[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
- result[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
- result[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
- result[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
-#endif
}
* Do trilinear interpolation of colors.
*/
static INLINE void
-lerp_rgba_3d(GLchan result[4], GLfloat a, GLfloat b, GLfloat c,
- const GLchan t000[4], const GLchan t100[4],
- const GLchan t010[4], const GLchan t110[4],
- const GLchan t001[4], const GLchan t101[4],
- const GLchan t011[4], const GLchan t111[4])
+lerp_rgba_3d(GLfloat result[4], GLfloat a, GLfloat b, GLfloat c,
+ const GLfloat t000[4], const GLfloat t100[4],
+ const GLfloat t010[4], const GLfloat t110[4],
+ const GLfloat t001[4], const GLfloat t101[4],
+ const GLfloat t011[4], const GLfloat t111[4])
{
GLuint k;
/* compiler should unroll these short loops */
-#if CHAN_TYPE == GL_FLOAT
for (k = 0; k < 4; k++) {
result[k] = lerp_3d(a, b, c, t000[k], t100[k], t010[k], t110[k],
t001[k], t101[k], t011[k], t111[k]);
}
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- for (k = 0; k < 4; k++) {
- result[k] = (GLchan)(lerp_3d(a, b, c,
- t000[k], t100[k], t010[k], t110[k],
- t001[k], t101[k], t011[k], t111[k]) + 0.5F);
- }
-#else
- GLint ia = IROUND_POS(a * ILERP_SCALE);
- GLint ib = IROUND_POS(b * ILERP_SCALE);
- GLint ic = IROUND_POS(c * ILERP_SCALE);
- for (k = 0; k < 4; k++) {
- result[k] = ilerp_3d(ia, ib, ic, t000[k], t100[k], t010[k], t110[k],
- t001[k], t101[k], t011[k], t111[k]);
- }
-#endif
}
* If A is a signed integer, A % B doesn't give the right value for A < 0
* (in terms of texture repeat). Just casting to unsigned fixes that.
*/
-#define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B))
+#define REMAINDER(A, B) (((A) + (B) * 1024) % (B))
/**
* Used to compute texel locations for linear sampling.
* Input:
* wrapMode = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER
- * S = texcoord in [0,1]
- * SIZE = width (or height or depth) of texture
+ * 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
+ * i0, i1 = returns two nearest texel indexes
+ * weight = returns blend factor between texels
*/
-#define COMPUTE_LINEAR_TEXEL_LOCATIONS(wrapMode, S, U, SIZE, I0, I1) \
-{ \
- switch (wrapMode) { \
- case GL_REPEAT: \
- U = S * SIZE - 0.5F; \
- if (img->_IsPowerOfTwo) { \
- I0 = IFLOOR(U) & (SIZE - 1); \
- I1 = (I0 + 1) & (SIZE - 1); \
- } \
- else { \
- I0 = REMAINDER(IFLOOR(U), SIZE); \
- I1 = REMAINDER(I0 + 1, SIZE); \
- } \
- break; \
- case 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; \
- break; \
- case GL_CLAMP_TO_BORDER: \
- { \
- 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; \
- } \
- break; \
- case GL_MIRRORED_REPEAT: \
- { \
- 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) - 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- if (I0 < 0) \
- I0 = 0; \
- if (I1 >= (GLint) SIZE) \
- I1 = SIZE - 1; \
- } \
- break; \
- case GL_MIRROR_CLAMP_EXT: \
- U = FABSF(S); \
- if (U >= 1.0F) \
- U = (GLfloat) SIZE; \
- else \
- U *= SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- break; \
- case GL_MIRROR_CLAMP_TO_EDGE_EXT: \
- U = FABSF(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; \
- break; \
- case GL_MIRROR_CLAMP_TO_BORDER_EXT: \
- { \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- U = FABSF(S); \
- if (U <= min) \
- U = min * SIZE; \
- else if (U >= max) \
- U = max * SIZE; \
- else \
- U *= SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- } \
- break; \
- case 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; \
- break; \
- default: \
- _mesa_problem(ctx, "Bad wrap mode"); \
- } \
+static INLINE void
+linear_texel_locations(GLenum wrapMode,
+ const struct gl_texture_image *img,
+ GLint size, GLfloat s,
+ GLint *i0, GLint *i1, GLfloat *weight)
+{
+ GLfloat u;
+ switch (wrapMode) {
+ case GL_REPEAT:
+ u = s * size - 0.5F;
+ if (img->_IsPowerOfTwo) {
+ *i0 = IFLOOR(u) & (size - 1);
+ *i1 = (*i0 + 1) & (size - 1);
+ }
+ else {
+ *i0 = REMAINDER(IFLOOR(u), size);
+ *i1 = REMAINDER(*i0 + 1, size);
+ }
+ break;
+ case 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;
+ break;
+ case GL_CLAMP_TO_BORDER:
+ {
+ 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;
+ }
+ break;
+ case GL_MIRRORED_REPEAT:
+ {
+ const GLint flr = IFLOOR(s);
+ if (flr & 1)
+ u = 1.0F - (s - (GLfloat) flr);
+ else
+ u = s - (GLfloat) flr;
+ u = (u * size) - 0.5F;
+ *i0 = IFLOOR(u);
+ *i1 = *i0 + 1;
+ if (*i0 < 0)
+ *i0 = 0;
+ if (*i1 >= (GLint) size)
+ *i1 = size - 1;
+ }
+ break;
+ case GL_MIRROR_CLAMP_EXT:
+ u = FABSF(s);
+ if (u >= 1.0F)
+ u = (GLfloat) size;
+ else
+ u *= size;
+ u -= 0.5F;
+ *i0 = IFLOOR(u);
+ *i1 = *i0 + 1;
+ break;
+ case GL_MIRROR_CLAMP_TO_EDGE_EXT:
+ u = FABSF(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;
+ break;
+ case GL_MIRROR_CLAMP_TO_BORDER_EXT:
+ {
+ const GLfloat min = -1.0F / (2.0F * size);
+ const GLfloat max = 1.0F - min;
+ u = FABSF(s);
+ if (u <= min)
+ u = min * size;
+ else if (u >= max)
+ u = max * size;
+ else
+ u *= size;
+ u -= 0.5F;
+ *i0 = IFLOOR(u);
+ *i1 = *i0 + 1;
+ }
+ break;
+ case 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;
+ break;
+ default:
+ _mesa_problem(NULL, "Bad wrap mode");
+ u = 0.0F;
+ }
+ *weight = FRAC(u);
}
/**
* Used to compute texel location for nearest sampling.
*/
-#define COMPUTE_NEAREST_TEXEL_LOCATION(wrapMode, S, SIZE, I) \
-{ \
- switch (wrapMode) { \
- case GL_REPEAT: \
- /* s limited to [0,1) */ \
- /* i limited to [0,size-1] */ \
- I = IFLOOR(S * SIZE); \
- if (img->_IsPowerOfTwo) \
- I &= (SIZE - 1); \
- else \
- I = REMAINDER(I, SIZE); \
- break; \
- case 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); \
- } \
- break; \
- case GL_CLAMP_TO_BORDER: \
- { \
- /* 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); \
- } \
- break; \
- case GL_MIRRORED_REPEAT: \
- { \
- 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); \
- } \
- break; \
- case GL_MIRROR_CLAMP_EXT: \
- { \
- /* s limited to [0,1] */ \
- /* i limited to [0,size-1] */ \
- const GLfloat u = FABSF(S); \
- if (u <= 0.0F) \
- I = 0; \
- else if (u >= 1.0F) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- break; \
- case GL_MIRROR_CLAMP_TO_EDGE_EXT: \
- { \
- /* 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 = FABSF(S); \
- if (u < min) \
- I = 0; \
- else if (u > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- break; \
- case GL_MIRROR_CLAMP_TO_BORDER_EXT: \
- { \
- /* 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 = FABSF(S); \
- if (u < min) \
- I = -1; \
- else if (u > max) \
- I = SIZE; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- break; \
- case 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); \
- break; \
- default: \
- _mesa_problem(ctx, "Bad wrap mode"); \
- } \
+static INLINE GLint
+nearest_texel_location(GLenum wrapMode,
+ const struct gl_texture_image *img,
+ GLint size, GLfloat s)
+{
+ GLint i;
+
+ switch (wrapMode) {
+ case GL_REPEAT:
+ /* s limited to [0,1) */
+ /* i limited to [0,size-1] */
+ i = IFLOOR(s * size);
+ if (img->_IsPowerOfTwo)
+ i &= (size - 1);
+ else
+ i = REMAINDER(i, size);
+ return i;
+ case 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);
+ }
+ return i;
+ case GL_CLAMP_TO_BORDER:
+ {
+ /* 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);
+ }
+ return i;
+ case GL_MIRRORED_REPEAT:
+ {
+ 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);
+ else
+ u = s - (GLfloat) flr;
+ if (u < min)
+ i = 0;
+ else if (u > max)
+ i = size - 1;
+ else
+ i = IFLOOR(u * size);
+ }
+ return i;
+ case GL_MIRROR_CLAMP_EXT:
+ {
+ /* s limited to [0,1] */
+ /* i limited to [0,size-1] */
+ const GLfloat u = FABSF(s);
+ if (u <= 0.0F)
+ i = 0;
+ else if (u >= 1.0F)
+ i = size - 1;
+ else
+ i = IFLOOR(u * size);
+ }
+ return i;
+ case GL_MIRROR_CLAMP_TO_EDGE_EXT:
+ {
+ /* 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 = FABSF(s);
+ if (u < min)
+ i = 0;
+ else if (u > max)
+ i = size - 1;
+ else
+ i = IFLOOR(u * size);
+ }
+ return i;
+ case GL_MIRROR_CLAMP_TO_BORDER_EXT:
+ {
+ /* 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 = FABSF(s);
+ if (u < min)
+ i = -1;
+ else if (u > max)
+ i = size;
+ else
+ i = IFLOOR(u * size);
+ }
+ return i;
+ case 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);
+ return i;
+ default:
+ _mesa_problem(NULL, "Bad wrap mode");
+ return 0;
+ }
}
/* Power of two image sizes only */
-#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); \
+static INLINE void
+linear_repeat_texel_location(GLuint size, GLfloat s,
+ GLint *i0, GLint *i1, GLfloat *weight)
+{
+ GLfloat u = s * size - 0.5F;
+ *i0 = IFLOOR(u) & (size - 1);
+ *i1 = (*i0 + 1) & (size - 1);
+ *weight = FRAC(u);
+}
+
+
+/**
+ * Do clamp/wrap for a texture rectangle coord, GL_NEAREST filter mode.
+ */
+static INLINE GLint
+clamp_rect_coord_nearest(GLenum wrapMode, GLfloat coord, GLint max)
+{
+ switch (wrapMode) {
+ case GL_CLAMP:
+ return IFLOOR( CLAMP(coord, 0.0F, max - 1) );
+ case GL_CLAMP_TO_EDGE:
+ return IFLOOR( CLAMP(coord, 0.5F, max - 0.5F) );
+ case GL_CLAMP_TO_BORDER:
+ return IFLOOR( CLAMP(coord, -0.5F, max + 0.5F) );
+ default:
+ _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_nearest");
+ return 0;
+ }
+}
+
+
+/**
+ * As above, but GL_LINEAR filtering.
+ */
+static INLINE void
+clamp_rect_coord_linear(GLenum wrapMode, GLfloat coord, GLint max,
+ GLint *i0out, GLint *i1out, GLfloat *weight)
+{
+ GLfloat fcol;
+ GLint i0, i1;
+ switch (wrapMode) {
+ case GL_CLAMP:
+ /* Not exactly what the spec says, but it matches NVIDIA output */
+ fcol = CLAMP(coord - 0.5F, 0.0, max-1);
+ i0 = IFLOOR(fcol);
+ i1 = i0 + 1;
+ break;
+ case GL_CLAMP_TO_EDGE:
+ fcol = CLAMP(coord, 0.5F, max - 0.5F);
+ fcol -= 0.5F;
+ i0 = IFLOOR(fcol);
+ i1 = i0 + 1;
+ if (i1 > max - 1)
+ i1 = max - 1;
+ break;
+ case GL_CLAMP_TO_BORDER:
+ fcol = CLAMP(coord, -0.5F, max + 0.5F);
+ fcol -= 0.5F;
+ i0 = IFLOOR(fcol);
+ i1 = i0 + 1;
+ break;
+ default:
+ _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_linear");
+ i0 = i1 = 0;
+ fcol = 0.0F;
+ }
+ *i0out = i0;
+ *i1out = i1;
+ *weight = FRAC(fcol);
+}
+
+
+/**
+ * Compute nearest integer texcoords for given texobj and coordinate.
+ */
+static INLINE void
+nearest_texcoord(const struct gl_texture_object *texObj,
+ const GLfloat texcoord[4],
+ GLint *i, GLint *j, GLint *k)
+{
+ const GLint baseLevel = texObj->BaseLevel;
+ const struct gl_texture_image *img = texObj->Image[0][baseLevel];
+ const GLint width = img->Width;
+ const GLint height = img->Height;
+ const GLint depth = img->Depth;
+
+ switch (texObj->Target) {
+ case GL_TEXTURE_RECTANGLE_ARB:
+ *i = clamp_rect_coord_nearest(texObj->WrapS, texcoord[0], width);
+ *j = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height);
+ *k = 0;
+ break;
+ case GL_TEXTURE_1D:
+ *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
+ *j = 0;
+ *k = 0;
+ break;
+ case GL_TEXTURE_2D:
+ *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
+ *j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]);
+ *k = 0;
+ break;
+ case GL_TEXTURE_1D_ARRAY_EXT:
+ *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
+ *j = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height);
+ *k = 0;
+ break;
+ case GL_TEXTURE_2D_ARRAY_EXT:
+ *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
+ *j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]);
+ *k = clamp_rect_coord_nearest(texObj->WrapR, texcoord[2], depth);
+ break;
+ default:
+ *i = *j = *k = 0;
+ }
}
+/**
+ * Compute linear integer texcoords for given texobj and coordinate.
+ */
+static INLINE void
+linear_texcoord(const struct gl_texture_object *texObj,
+ const GLfloat texcoord[4],
+ GLint *i0, GLint *i1, GLint *j0, GLint *j1, GLint *slice,
+ GLfloat *wi, GLfloat *wj)
+{
+ const GLint baseLevel = texObj->BaseLevel;
+ const struct gl_texture_image *img = texObj->Image[0][baseLevel];
+ const GLint width = img->Width;
+ const GLint height = img->Height;
+ const GLint depth = img->Depth;
+
+ switch (texObj->Target) {
+ case GL_TEXTURE_RECTANGLE_ARB:
+ clamp_rect_coord_linear(texObj->WrapS, texcoord[0],
+ width, i0, i1, wi);
+ clamp_rect_coord_linear(texObj->WrapT, texcoord[1],
+ height, j0, j1, wj);
+ *slice = 0;
+ break;
+
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_2D:
+ linear_texel_locations(texObj->WrapS, img, width,
+ texcoord[0], i0, i1, wi);
+ linear_texel_locations(texObj->WrapT, img, height,
+ texcoord[1], j0, j1, wj);
+ *slice = 0;
+ break;
+
+ case GL_TEXTURE_1D_ARRAY_EXT:
+ linear_texel_locations(texObj->WrapS, img, width,
+ texcoord[0], i0, i1, wi);
+ *j0 = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height);
+ *j1 = *j0;
+ *slice = 0;
+ break;
+
+ case GL_TEXTURE_2D_ARRAY_EXT:
+ linear_texel_locations(texObj->WrapS, img, width,
+ texcoord[0], i0, i1, wi);
+ linear_texel_locations(texObj->WrapT, img, height,
+ texcoord[1], j0, j1, wj);
+ *slice = clamp_rect_coord_nearest(texObj->WrapR, texcoord[2], depth);
+ break;
+
+ default:
+ *slice = 0;
+ }
+}
+
+
+
/**
* For linear interpolation between mipmap levels N and N+1, this function
* computes N.
-/*
- * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
- * see 1-pixel bands of improperly weighted linear-filtered textures.
- * 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.
*/
-/*
+/**
* 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.
}
+/**
+ * When we sample the border color, it must be interpreted according to
+ * the base texture format. Ex: if the texture base format it GL_ALPHA,
+ * we return (0,0,0,BorderAlpha).
+ */
+static INLINE void
+get_border_color(const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ GLfloat rgba[4])
+{
+ switch (img->TexFormat->BaseFormat) {
+ case GL_RGB:
+ rgba[0] = tObj->BorderColor[0];
+ rgba[1] = tObj->BorderColor[1];
+ rgba[2] = tObj->BorderColor[2];
+ rgba[3] = 1.0F;
+ break;
+ case GL_ALPHA:
+ rgba[0] = rgba[1] = rgba[2] = 0.0;
+ rgba[3] = tObj->BorderColor[3];
+ break;
+ case GL_LUMINANCE:
+ rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor[0];
+ rgba[3] = 1.0;
+ break;
+ case GL_LUMINANCE_ALPHA:
+ rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor[0];
+ rgba[3] = tObj->BorderColor[3];
+ break;
+ case GL_INTENSITY:
+ rgba[0] = rgba[1] = rgba[2] = rgba[3] = tObj->BorderColor[0];
+ break;
+ default:
+ COPY_4V(rgba, tObj->BorderColor);
+ }
+}
+
+
/**********************************************************************/
/* 1-D Texture Sampling Functions */
/**********************************************************************/
-/*
+/**
* Return the texture sample for coordinate (s) using GL_NEAREST filter.
*/
-static void
+static INLINE 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])
+ const GLfloat texcoord[4], GLfloat rgba[4])
{
const GLint width = img->Width2; /* without border, power of two */
GLint i;
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
+ i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
/* skip over the border, if any */
i += img->Border;
if (i < 0 || i >= (GLint) img->Width) {
/* Need this test for GL_CLAMP_TO_BORDER mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
+ get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelc(img, i, 0, 0, rgba);
+ img->FetchTexelf(img, i, 0, 0, rgba);
}
}
-/*
+/**
* Return the texture sample for coordinate (s) using GL_LINEAR filter.
*/
-static void
+static INLINE 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])
+ const GLfloat texcoord[4], GLfloat rgba[4])
{
const GLint width = img->Width2;
GLint i0, i1;
- GLfloat u;
GLbitfield useBorderColor = 0x0;
GLfloat a;
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
+ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
if (img->Border) {
i0 += img->Border;
/* fetch texel colors */
if (useBorderColor & I0BIT) {
- COPY_CHAN4(t0, tObj->_BorderChan);
+ get_border_color(tObj, img, t0);
}
else {
- img->FetchTexelc(img, i0, 0, 0, t0);
+ img->FetchTexelf(img, i0, 0, 0, t0);
}
if (useBorderColor & I1BIT) {
- COPY_CHAN4(t1, tObj->_BorderChan);
+ get_border_color(tObj, img, t1);
}
else {
- img->FetchTexelc(img, i1, 0, 0, t1);
+ img->FetchTexelf(img, i1, 0, 0, t1);
}
- a = FRAC(u);
lerp_rgba(rgba, a, t0, t1);
}
sample_1d_nearest_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_1d_linear_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_1d_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4];
+ GLfloat t0[4], t1[4];
const GLfloat f = FRAC(lambda[i]);
sample_1d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_1d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
}
-
static void
sample_1d_linear_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4];
+ GLfloat t0[4], t1[4];
const GLfloat f = FRAC(lambda[i]);
sample_1d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_1d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
}
-
+/** Sample 1D texture, nearest filtering for both min/magnification */
static void
sample_nearest_1d( GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4] )
+ GLfloat rgba[][4] )
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_1d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
-
+/** Sample 1D texture, linear filtering for both min/magnification */
static void
sample_linear_1d( GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4] )
+ GLfloat rgba[][4] )
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_1d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
-/*
- * Given an (s) texture coordinate and lambda (level of detail) value,
- * return a texture sample.
- *
- */
+/** Sample 1D texture, using lambda to choose between min/magnification */
static void
sample_lambda_1d( GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+ const GLfloat lambda[], GLfloat rgba[][4] )
{
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
/**********************************************************************/
-/*
+/**
* Return the texture sample for coordinate (s,t) using GL_NEAREST filter.
*/
static INLINE void
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[])
+ GLfloat rgba[])
{
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height2; /* without border, power of two */
GLint i, j;
(void) ctx;
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoord[1], height, j);
+ i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
+ j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
/* skip over the border, if any */
i += img->Border;
if (i < 0 || i >= (GLint) img->Width || j < 0 || j >= (GLint) img->Height) {
/* Need this test for GL_CLAMP_TO_BORDER mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
+ get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelc(img, i, j, 0, rgba);
+ img->FetchTexelf(img, i, j, 0, rgba);
}
}
-
/**
* Return the texture sample for coordinate (s,t) using GL_LINEAR filter.
* New sampling code contributed by Lynn Quam <quam@ai.sri.com>.
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[])
+ GLfloat rgba[])
{
const GLint width = img->Width2;
const GLint height = img->Height2;
GLint i0, j0, i1, j1;
GLbitfield useBorderColor = 0x0;
- GLfloat u, v;
GLfloat a, b;
- GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
+ GLfloat t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoord[1], v, height, j0, j1);
+ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
+ linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
if (img->Border) {
i0 += img->Border;
/* fetch four texel colors */
if (useBorderColor & (I0BIT | J0BIT)) {
- COPY_CHAN4(t00, tObj->_BorderChan);
+ get_border_color(tObj, img, t00);
}
else {
- img->FetchTexelc(img, i0, j0, 0, t00);
+ img->FetchTexelf(img, i0, j0, 0, t00);
}
if (useBorderColor & (I1BIT | J0BIT)) {
- COPY_CHAN4(t10, tObj->_BorderChan);
+ get_border_color(tObj, img, t10);
}
else {
- img->FetchTexelc(img, i1, j0, 0, t10);
+ img->FetchTexelf(img, i1, j0, 0, t10);
}
if (useBorderColor & (I0BIT | J1BIT)) {
- COPY_CHAN4(t01, tObj->_BorderChan);
+ get_border_color(tObj, img, t01);
}
else {
- img->FetchTexelc(img, i0, j1, 0, t01);
+ img->FetchTexelf(img, i0, j1, 0, t01);
}
if (useBorderColor & (I1BIT | J1BIT)) {
- COPY_CHAN4(t11, tObj->_BorderChan);
+ get_border_color(tObj, img, t11);
}
else {
- img->FetchTexelc(img, i1, j1, 0, t11);
+ img->FetchTexelf(img, i1, j1, 0, t11);
}
- a = FRAC(u);
- b = FRAC(v);
lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
}
-/*
+/**
* As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT.
* We don't have to worry about the texture border.
*/
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[])
+ GLfloat rgba[])
{
const GLint width = img->Width2;
const GLint height = img->Height2;
GLint i0, j0, i1, j1;
- GLfloat u, v;
- GLfloat a, b;
- GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
+ GLfloat wi, wj;
+ GLfloat t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
(void) ctx;
ASSERT(img->TexFormat->BaseFormat != GL_COLOR_INDEX);
ASSERT(img->_IsPowerOfTwo);
- COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(texcoord[0], u, width, i0, i1);
- COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(texcoord[1], v, height, j0, j1);
+ linear_repeat_texel_location(width, texcoord[0], &i0, &i1, &wi);
+ linear_repeat_texel_location(height, texcoord[1], &j0, &j1, &wj);
- img->FetchTexelc(img, i0, j0, 0, t00);
- img->FetchTexelc(img, i1, j0, 0, t10);
- img->FetchTexelc(img, i0, j1, 0, t01);
- img->FetchTexelc(img, i1, j1, 0, t11);
+ img->FetchTexelf(img, i0, j0, 0, t00);
+ img->FetchTexelf(img, i1, j0, 0, t10);
+ img->FetchTexelf(img, i0, j1, 0, t01);
+ img->FetchTexelf(img, i1, j1, 0, t11);
- a = FRAC(u);
- b = FRAC(v);
- lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
+ lerp_rgba_2d(rgba, wi, wj, t00, t10, t01, t11);
}
-
static void
sample_2d_nearest_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
for (i = 0; i < n; i++) {
}
-
static void
sample_2d_linear_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
}
-
static void
sample_2d_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
sample_2d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_2d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
}
-
-/* Trilinear filtering */
static void
sample_2d_linear_mipmap_linear( GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+ const GLfloat lambda[], GLfloat rgba[][4] )
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
sample_2d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_2d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
static void
-sample_2d_linear_mipmap_linear_repeat( GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+sample_2d_linear_mipmap_linear_repeat(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
- sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
- sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level ],
+ texcoord[i], t0);
+ sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level+1],
+ texcoord[i], t1);
lerp_rgba(rgba[i], f, t0, t1);
}
}
}
+/** Sample 2D texture, nearest filtering for both min/magnification */
static void
-sample_nearest_2d( GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+sample_nearest_2d(GLcontext *ctx,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_2d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
-
+/** Sample 2D texture, linear filtering for both min/magnification */
static void
-sample_linear_2d( GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+sample_linear_2d(GLcontext *ctx,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
tObj->WrapT == GL_REPEAT &&
image->_IsPowerOfTwo &&
image->Border == 0) {
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_2d_linear_repeat(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
else {
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_2d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
}
-/*
+/**
* Optimized 2-D texture sampling:
* S and T wrap mode == GL_REPEAT
* GL_NEAREST min/mag filter
* Format = GL_RGB
*/
static void
-opt_sample_rgb_2d( GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+opt_sample_rgb_2d(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][tObj->BaseLevel];
const GLfloat width = (GLfloat) img->Width;
}
-/*
+/**
* Optimized 2-D texture sampling:
* S and T wrap mode == GL_REPEAT
* GL_NEAREST min/mag filter
* Format = GL_RGBA
*/
static void
-opt_sample_rgba_2d( GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+opt_sample_rgba_2d(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][tObj->BaseLevel];
const GLfloat width = (GLfloat) img->Width;
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);
+ COPY_4V(rgba[i], texel);
}
}
-/*
- * Given an array of texture coordinate and lambda (level of detail)
- * values, return an array of texture sample.
- */
+/** Sample 2D texture, using lambda to choose between min/magnification */
static void
-sample_lambda_2d( GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+sample_lambda_2d(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
const struct gl_texture_image *tImg = tObj->Image[0][tObj->BaseLevel];
GLuint minStart, minEnd; /* texels with minification */
case GL_NEAREST:
if (repeatNoBorderPOT) {
switch (tImg->TexFormat->MesaFormat) {
+#if 0
case MESA_FORMAT_RGB:
opt_sample_rgb_2d(ctx, tObj, m, texcoords + minStart,
NULL, rgba + minStart);
opt_sample_rgba_2d(ctx, tObj, m, texcoords + minStart,
NULL, rgba + minStart);
break;
+#endif
default:
sample_nearest_2d(ctx, tObj, m, texcoords + minStart,
NULL, rgba + minStart );
case GL_NEAREST:
if (repeatNoBorderPOT) {
switch (tImg->TexFormat->MesaFormat) {
+#if 0
case MESA_FORMAT_RGB:
opt_sample_rgb_2d(ctx, tObj, m, texcoords + magStart,
NULL, rgba + magStart);
opt_sample_rgba_2d(ctx, tObj, m, texcoords + magStart,
NULL, rgba + magStart);
break;
+#endif
default:
sample_nearest_2d(ctx, tObj, m, texcoords + magStart,
NULL, rgba + magStart );
/* 3-D Texture Sampling Functions */
/**********************************************************************/
-/*
+/**
* Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
*/
-static void
+static INLINE 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])
+ GLfloat rgba[4])
{
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height2; /* without border, power of two */
GLint i, j, k;
(void) ctx;
- 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);
+ i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
+ j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
+ k = nearest_texel_location(tObj->WrapR, img, depth, texcoord[2]);
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 mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
+ get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelc(img, i, j, k, rgba);
+ img->FetchTexelf(img, i, j, k, rgba);
}
}
-
-/*
+/**
* Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
*/
static void
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[4])
+ GLfloat rgba[4])
{
const GLint width = img->Width2;
const GLint height = img->Height2;
const GLint depth = img->Depth2;
GLint i0, j0, k0, i1, j1, k1;
GLbitfield useBorderColor = 0x0;
- GLfloat u, v, w;
GLfloat a, b, c;
- GLchan t000[4], t010[4], t001[4], t011[4];
- GLchan t100[4], t110[4], t101[4], t111[4];
+ GLfloat t000[4], t010[4], t001[4], t011[4];
+ GLfloat t100[4], t110[4], t101[4], t111[4];
- 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);
+ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
+ linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
+ linear_texel_locations(tObj->WrapR, img, depth, texcoord[2], &k0, &k1, &c);
if (img->Border) {
i0 += img->Border;
/* Fetch texels */
if (useBorderColor & (I0BIT | J0BIT | K0BIT)) {
- COPY_CHAN4(t000, tObj->_BorderChan);
+ get_border_color(tObj, img, t000);
}
else {
- img->FetchTexelc(img, i0, j0, k0, t000);
+ img->FetchTexelf(img, i0, j0, k0, t000);
}
if (useBorderColor & (I1BIT | J0BIT | K0BIT)) {
- COPY_CHAN4(t100, tObj->_BorderChan);
+ get_border_color(tObj, img, t100);
}
else {
- img->FetchTexelc(img, i1, j0, k0, t100);
+ img->FetchTexelf(img, i1, j0, k0, t100);
}
if (useBorderColor & (I0BIT | J1BIT | K0BIT)) {
- COPY_CHAN4(t010, tObj->_BorderChan);
+ get_border_color(tObj, img, t010);
}
else {
- img->FetchTexelc(img, i0, j1, k0, t010);
+ img->FetchTexelf(img, i0, j1, k0, t010);
}
if (useBorderColor & (I1BIT | J1BIT | K0BIT)) {
- COPY_CHAN4(t110, tObj->_BorderChan);
+ get_border_color(tObj, img, t110);
}
else {
- img->FetchTexelc(img, i1, j1, k0, t110);
+ img->FetchTexelf(img, i1, j1, k0, t110);
}
if (useBorderColor & (I0BIT | J0BIT | K1BIT)) {
- COPY_CHAN4(t001, tObj->_BorderChan);
+ get_border_color(tObj, img, t001);
}
else {
- img->FetchTexelc(img, i0, j0, k1, t001);
+ img->FetchTexelf(img, i0, j0, k1, t001);
}
if (useBorderColor & (I1BIT | J0BIT | K1BIT)) {
- COPY_CHAN4(t101, tObj->_BorderChan);
+ get_border_color(tObj, img, t101);
}
else {
- img->FetchTexelc(img, i1, j0, k1, t101);
+ img->FetchTexelf(img, i1, j0, k1, t101);
}
if (useBorderColor & (I0BIT | J1BIT | K1BIT)) {
- COPY_CHAN4(t011, tObj->_BorderChan);
+ get_border_color(tObj, img, t011);
}
else {
- img->FetchTexelc(img, i0, j1, k1, t011);
+ img->FetchTexelf(img, i0, j1, k1, t011);
}
if (useBorderColor & (I1BIT | J1BIT | K1BIT)) {
- COPY_CHAN4(t111, tObj->_BorderChan);
+ get_border_color(tObj, img, t111);
}
else {
- img->FetchTexelc(img, i1, j1, k1, t111);
+ img->FetchTexelf(img, i1, j1, k1, t111);
}
/* trilinear interpolation of samples */
- a = FRAC(u);
- b = FRAC(v);
- c = FRAC(w);
lerp_rgba_3d(rgba, a, b, c, t000, t100, t010, t110, t001, t101, t011, t111);
}
-
static void
sample_3d_nearest_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+ const GLfloat lambda[], GLfloat rgba[][4] )
{
GLuint i;
for (i = 0; i < n; i++) {
sample_3d_linear_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_3d_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
sample_3d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_3d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
sample_3d_linear_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
sample_3d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_3d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
}
+/** Sample 3D texture, nearest filtering for both min/magnification */
static void
sample_nearest_3d(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_3d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
-
+/** Sample 3D texture, linear filtering for both min/magnification */
static void
-sample_linear_3d( GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+sample_linear_3d(GLcontext *ctx,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ 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.
- */
+/** Sample 3D texture, using lambda to choose between min/magnification */
static void
-sample_lambda_3d( GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4] )
+sample_lambda_3d(GLcontext *ctx,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLfloat rgba[][4])
{
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
sample_nearest_cube(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ GLfloat rgba[][4])
{
GLuint i;
(void) lambda;
sample_linear_cube(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
(void) lambda;
sample_cube_nearest_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_cube_linear_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_cube_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
newCoord, rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat 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);
sample_cube_linear_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
newCoord, rgba[i]);
}
else {
- GLchan t0[4], t1[4];
+ GLfloat 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);
}
+/** Sample cube texture, using lambda to choose between min/magnification */
static void
-sample_lambda_cube( GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+sample_lambda_cube(GLcontext *ctx,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLfloat rgba[][4])
{
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
/**********************************************************************/
-/**
- * Do clamp/wrap for a texture rectangle coord, GL_NEAREST filter mode.
- */
-static INLINE GLint
-clamp_rect_coord_nearest(GLenum wrapMode, GLfloat coord, GLint max)
-{
- if (wrapMode == GL_CLAMP) {
- return IFLOOR( CLAMP(coord, 0.0F, max - 1) );
- }
- else if (wrapMode == GL_CLAMP_TO_EDGE) {
- return IFLOOR( CLAMP(coord, 0.5F, max - 0.5F) );
- }
- else {
- return IFLOOR( CLAMP(coord, -0.5F, max + 0.5F) );
- }
-}
-
-
-/*
- * As above, but GL_LINEAR filtering.
- */
-static INLINE void
-clamp_rect_coord_linear(GLenum wrapMode, GLfloat coord, GLint max,
- GLint *i0out, GLint *i1out)
-{
- GLfloat fcol;
- GLint i0, i1;
- if (wrapMode == GL_CLAMP) {
- /* Not exactly what the spec says, but it matches NVIDIA output */
- fcol = CLAMP(coord - 0.5F, 0.0, max-1);
- i0 = IFLOOR(fcol);
- i1 = i0 + 1;
- }
- else if (wrapMode == GL_CLAMP_TO_EDGE) {
- fcol = CLAMP(coord, 0.5F, max - 0.5F);
- fcol -= 0.5F;
- i0 = IFLOOR(fcol);
- i1 = i0 + 1;
- if (i1 > max - 1)
- i1 = max - 1;
- }
- else {
- ASSERT(wrapMode == GL_CLAMP_TO_BORDER);
- fcol = CLAMP(coord, -0.5F, max + 0.5F);
- fcol -= 0.5F;
- i0 = IFLOOR(fcol);
- i1 = i0 + 1;
- }
- *i0out = i0;
- *i1out = i1;
-}
-
-
static void
sample_nearest_rect(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ GLfloat rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][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;
+ const GLint width = img->Width;
+ const GLint height = img->Height;
GLuint i;
(void) ctx;
GLint row, col;
col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width);
row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
- if (col < 0 || col > width_minus_1 || row < 0 || row > height_minus_1)
- COPY_CHAN4(rgba[i], tObj->_BorderChan);
+ if (col < 0 || col >= width || row < 0 || row >= height)
+ get_border_color(tObj, img, rgba[i]);
else
- img->FetchTexelc(img, col, row, 0, rgba[i]);
+ img->FetchTexelf(img, col, row, 0, rgba[i]);
}
}
sample_linear_rect(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][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;
+ const GLint width = img->Width;
+ const GLint height = img->Height;
GLuint i;
(void) ctx;
tObj->WrapT == GL_CLAMP_TO_BORDER);
ASSERT(img->TexFormat->BaseFormat != GL_COLOR_INDEX);
- /* XXX lots of opportunity for optimization in this loop */
for (i = 0; i < n; i++) {
- GLfloat frow, fcol;
GLint i0, j0, i1, j1;
- GLchan t00[4], t01[4], t10[4], t11[4];
+ GLfloat t00[4], t01[4], t10[4], t11[4];
GLfloat a, b;
GLbitfield useBorderColor = 0x0;
- /* NOTE: we DO NOT use [0, 1] texture coordinates! */
- if (tObj->WrapS == GL_CLAMP) {
- /* Not exactly what the spec says, but it matches NVIDIA output */
- fcol = CLAMP(texcoords[i][0] - 0.5F, 0.0, width_minus_1);
- i0 = IFLOOR(fcol);
- i1 = i0 + 1;
- }
- else if (tObj->WrapS == GL_CLAMP_TO_EDGE) {
- fcol = CLAMP(texcoords[i][0], 0.5F, width - 0.5F);
- fcol -= 0.5F;
- i0 = IFLOOR(fcol);
- i1 = i0 + 1;
- if (i1 > width_minus_1)
- i1 = width_minus_1;
- }
- else {
- ASSERT(tObj->WrapS == GL_CLAMP_TO_BORDER);
- fcol = CLAMP(texcoords[i][0], -0.5F, width + 0.5F);
- fcol -= 0.5F;
- i0 = IFLOOR(fcol);
- i1 = i0 + 1;
- }
-
- if (tObj->WrapT == GL_CLAMP) {
- /* Not exactly what the spec says, but it matches NVIDIA output */
- frow = CLAMP(texcoords[i][1] - 0.5F, 0.0, width_minus_1);
- j0 = IFLOOR(frow);
- j1 = j0 + 1;
- }
- else if (tObj->WrapT == GL_CLAMP_TO_EDGE) {
- frow = CLAMP(texcoords[i][1], 0.5F, height - 0.5F);
- frow -= 0.5F;
- j0 = IFLOOR(frow);
- j1 = j0 + 1;
- if (j1 > height_minus_1)
- j1 = height_minus_1;
- }
- else {
- ASSERT(tObj->WrapT == GL_CLAMP_TO_BORDER);
- frow = CLAMP(texcoords[i][1], -0.5F, height + 0.5F);
- frow -= 0.5F;
- j0 = IFLOOR(frow);
- j1 = j0 + 1;
- }
+ clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0], width,
+ &i0, &i1, &a);
+ clamp_rect_coord_linear(tObj->WrapT, texcoords[i][1], height,
+ &j0, &j1, &b);
/* compute integer rows/columns */
- if (i0 < 0 || i0 > width_minus_1) useBorderColor |= I0BIT;
- if (i1 < 0 || i1 > width_minus_1) useBorderColor |= I1BIT;
- if (j0 < 0 || j0 > height_minus_1) useBorderColor |= J0BIT;
- if (j1 < 0 || j1 > height_minus_1) useBorderColor |= J1BIT;
+ 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;
/* get four texel samples */
if (useBorderColor & (I0BIT | J0BIT))
- COPY_CHAN4(t00, tObj->_BorderChan);
+ get_border_color(tObj, img, t00);
else
- img->FetchTexelc(img, i0, j0, 0, t00);
+ img->FetchTexelf(img, i0, j0, 0, t00);
if (useBorderColor & (I1BIT | J0BIT))
- COPY_CHAN4(t10, tObj->_BorderChan);
+ get_border_color(tObj, img, t10);
else
- img->FetchTexelc(img, i1, j0, 0, t10);
+ img->FetchTexelf(img, i1, j0, 0, t10);
if (useBorderColor & (I0BIT | J1BIT))
- COPY_CHAN4(t01, tObj->_BorderChan);
+ get_border_color(tObj, img, t01);
else
- img->FetchTexelc(img, i0, j1, 0, t01);
+ img->FetchTexelf(img, i0, j1, 0, t01);
if (useBorderColor & (I1BIT | J1BIT))
- COPY_CHAN4(t11, tObj->_BorderChan);
+ get_border_color(tObj, img, t11);
else
- img->FetchTexelc(img, i1, j1, 0, t11);
-
- /* compute interpolants */
- a = FRAC(fcol);
- b = FRAC(frow);
+ img->FetchTexelf(img, i1, j1, 0, t11);
lerp_rgba_2d(rgba[i], a, b, t00, t10, t01, t11);
}
}
+/** Sample Rect texture, using lambda to choose between min/magnification */
static void
-sample_lambda_rect( GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+sample_lambda_rect(GLcontext *ctx,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLfloat rgba[][4])
{
GLuint minStart, minEnd, magStart, magEnd;
if (minStart < minEnd) {
if (tObj->MinFilter == GL_NEAREST) {
- sample_nearest_rect( ctx, tObj, minEnd - minStart,
- texcoords + minStart, NULL, rgba + minStart);
+ sample_nearest_rect(ctx, tObj, minEnd - minStart,
+ texcoords + minStart, NULL, rgba + minStart);
}
else {
- sample_linear_rect( ctx, tObj, minEnd - minStart,
- texcoords + minStart, NULL, rgba + minStart);
+ sample_linear_rect(ctx, tObj, minEnd - minStart,
+ texcoords + minStart, NULL, rgba + minStart);
}
}
if (magStart < magEnd) {
if (tObj->MagFilter == GL_NEAREST) {
- sample_nearest_rect( ctx, tObj, magEnd - magStart,
- texcoords + magStart, NULL, rgba + magStart);
+ sample_nearest_rect(ctx, tObj, magEnd - magStart,
+ texcoords + magStart, NULL, rgba + magStart);
}
else {
- sample_linear_rect( ctx, tObj, magEnd - magStart,
- texcoords + magStart, NULL, rgba + magStart);
+ sample_linear_rect(ctx, tObj, magEnd - magStart,
+ texcoords + magStart, NULL, rgba + magStart);
}
}
}
/* 2D Texture Array Sampling Functions */
/**********************************************************************/
-/*
+/**
* Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
*/
static void
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[4])
+ GLfloat rgba[4])
{
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height2; /* without border, power of two */
GLint array;
(void) ctx;
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoord[1], height, j);
+ i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
+ j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
array = clamp_rect_coord_nearest(tObj->WrapR, texcoord[2], depth);
if (i < 0 || i >= (GLint) img->Width ||
j < 0 || j >= (GLint) img->Height ||
array < 0 || array >= (GLint) img->Depth) {
/* Need this test for GL_CLAMP_TO_BORDER mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
+ get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelc(img, i, j, array, rgba);
+ img->FetchTexelf(img, i, j, array, rgba);
}
}
-
-/*
+/**
* Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
*/
static void
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[4])
+ GLfloat rgba[4])
{
const GLint width = img->Width2;
const GLint height = img->Height2;
GLint i0, j0, i1, j1;
GLint array;
GLbitfield useBorderColor = 0x0;
- GLfloat u, v;
GLfloat a, b;
- GLchan t00[4], t01[4], t10[4], t11[4];
+ GLfloat t00[4], t01[4], t10[4], t11[4];
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoord[1], v, height, j0, j1);
+ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
+ linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
array = clamp_rect_coord_nearest(tObj->WrapR, texcoord[2], depth);
if (array < 0 || array >= depth) {
- COPY_CHAN4(rgba, tObj->_BorderChan);
+ COPY_4V(rgba, tObj->BorderColor);
}
else {
if (img->Border) {
/* Fetch texels */
if (useBorderColor & (I0BIT | J0BIT)) {
- COPY_CHAN4(t00, tObj->_BorderChan);
+ get_border_color(tObj, img, t00);
}
else {
- img->FetchTexelc(img, i0, j0, array, t00);
+ img->FetchTexelf(img, i0, j0, array, t00);
}
if (useBorderColor & (I1BIT | J0BIT)) {
- COPY_CHAN4(t10, tObj->_BorderChan);
+ get_border_color(tObj, img, t10);
}
else {
- img->FetchTexelc(img, i1, j0, array, t10);
+ img->FetchTexelf(img, i1, j0, array, t10);
}
if (useBorderColor & (I0BIT | J1BIT)) {
- COPY_CHAN4(t01, tObj->_BorderChan);
+ get_border_color(tObj, img, t01);
}
else {
- img->FetchTexelc(img, i0, j1, array, t01);
+ img->FetchTexelf(img, i0, j1, array, t01);
}
if (useBorderColor & (I1BIT | J1BIT)) {
- COPY_CHAN4(t11, tObj->_BorderChan);
+ get_border_color(tObj, img, t11);
}
else {
- img->FetchTexelc(img, i1, j1, array, t11);
+ img->FetchTexelf(img, i1, j1, array, t11);
}
/* trilinear interpolation of samples */
- a = FRAC(u);
- b = FRAC(v);
lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
}
}
-
static void
sample_2d_array_nearest_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
for (i = 0; i < n; i++) {
sample_2d_array_linear_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_2d_array_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
- sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
- sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level ],
+ texcoord[i], t0);
+ sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level+1],
+ texcoord[i], t1);
lerp_rgba(rgba[i], f, t0, t1);
}
}
static void
sample_2d_array_linear_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
- sample_2d_array_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
- sample_2d_array_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ sample_2d_array_linear(ctx, tObj, tObj->Image[0][level ],
+ texcoord[i], t0);
+ sample_2d_array_linear(ctx, tObj, tObj->Image[0][level+1],
+ texcoord[i], t1);
lerp_rgba(rgba[i], f, t0, t1);
}
}
}
+/** Sample 2D Array texture, nearest filtering for both min/magnification */
static void
sample_nearest_2d_array(GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_2d_array_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
+/** Sample 2D Array texture, linear filtering for both min/magnification */
static void
sample_linear_2d_array(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_2d_array_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.
- */
+/** Sample 2D Array texture, using lambda to choose between min/magnification */
static void
sample_lambda_2d_array(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ GLfloat rgba[][4])
{
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
texcoords[i], rgba[i]);
break;
case GL_NEAREST_MIPMAP_NEAREST:
- sample_2d_array_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
+ sample_2d_array_nearest_mipmap_nearest(ctx, tObj, m,
+ texcoords + minStart,
+ lambda + minStart,
+ rgba + minStart);
break;
case GL_LINEAR_MIPMAP_NEAREST:
sample_2d_array_linear_mipmap_nearest(ctx, tObj, m,
rgba + minStart);
break;
case GL_NEAREST_MIPMAP_LINEAR:
- sample_2d_array_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
- lambda + minStart, rgba + minStart);
+ sample_2d_array_nearest_mipmap_linear(ctx, tObj, m,
+ texcoords + minStart,
+ lambda + minStart,
+ rgba + minStart);
break;
case GL_LINEAR_MIPMAP_LINEAR:
sample_2d_array_linear_mipmap_linear(ctx, tObj, m,
/* 1D Texture Array Sampling Functions */
/**********************************************************************/
-/*
+/**
* Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
*/
static void
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[4])
+ GLfloat rgba[4])
{
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height;
GLint array;
(void) ctx;
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
+ i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
array = clamp_rect_coord_nearest(tObj->WrapT, texcoord[1], height);
if (i < 0 || i >= (GLint) img->Width ||
array < 0 || array >= (GLint) img->Height) {
/* Need this test for GL_CLAMP_TO_BORDER mode */
- COPY_CHAN4(rgba, tObj->_BorderChan);
+ get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelc(img, i, array, 0, rgba);
+ img->FetchTexelf(img, i, array, 0, rgba);
}
}
-
-/*
+/**
* Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
*/
static void
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
- GLchan rgba[4])
+ GLfloat rgba[4])
{
const GLint width = img->Width2;
const GLint height = img->Height;
GLint i0, i1;
GLint array;
GLbitfield useBorderColor = 0x0;
- GLfloat u;
GLfloat a;
- GLchan t0[4], t1[4];
+ GLfloat t0[4], t1[4];
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
+ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
array = clamp_rect_coord_nearest(tObj->WrapT, texcoord[1], height);
if (img->Border) {
/* Fetch texels */
if (useBorderColor & (I0BIT | K0BIT)) {
- COPY_CHAN4(t0, tObj->_BorderChan);
+ get_border_color(tObj, img, t0);
}
else {
- img->FetchTexelc(img, i0, array, 0, t0);
+ img->FetchTexelf(img, i0, array, 0, t0);
}
if (useBorderColor & (I1BIT | K0BIT)) {
- COPY_CHAN4(t1, tObj->_BorderChan);
+ get_border_color(tObj, img, t1);
}
else {
- img->FetchTexelc(img, i1, array, 0, t1);
+ img->FetchTexelf(img, i1, array, 0, t1);
}
/* bilinear interpolation of samples */
- a = FRAC(u);
lerp_rgba(rgba, a, t0, t1);
}
-
static void
sample_1d_array_nearest_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4] )
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
for (i = 0; i < n; i++) {
sample_1d_array_linear_mipmap_nearest(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
sample_1d_array_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
static void
sample_1d_array_linear_mipmap_linear(GLcontext *ctx,
- const struct gl_texture_object *tObj,
- GLuint n, const GLfloat texcoord[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
ASSERT(lambda != NULL);
texcoord[i], rgba[i]);
}
else {
- GLchan t0[4], t1[4]; /* texels */
+ GLfloat t0[4], t1[4]; /* texels */
const GLfloat f = FRAC(lambda[i]);
sample_1d_array_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_1d_array_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
}
+/** Sample 1D Array texture, nearest filtering for both min/magnification */
static void
sample_nearest_1d_array(GLcontext *ctx,
- const struct gl_texture_object *tObj, GLuint n,
- const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_1d_array_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
}
}
-
+/** Sample 1D Array texture, linear filtering for both min/magnification */
static void
sample_linear_1d_array(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4],
- const GLfloat lambda[], GLchan rgba[][4])
+ const GLfloat lambda[], GLfloat rgba[][4])
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) lambda;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sample_1d_array_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.
- */
+/** Sample 1D Array texture, using lambda to choose between min/magnification */
static void
sample_lambda_1d_array(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ GLfloat rgba[][4])
{
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
}
+/**
+ * Compare texcoord against depth sample. Return 1.0 or the ambient value.
+ */
+static INLINE GLfloat
+shadow_compare(GLenum function, GLfloat coord, GLfloat depthSample,
+ GLfloat ambient)
+{
+ switch (function) {
+ case GL_LEQUAL:
+ return (coord <= depthSample) ? 1.0F : ambient;
+ case GL_GEQUAL:
+ return (coord >= depthSample) ? 1.0F : ambient;
+ case GL_LESS:
+ return (coord < depthSample) ? 1.0F : ambient;
+ case GL_GREATER:
+ return (coord > depthSample) ? 1.0F : ambient;
+ case GL_EQUAL:
+ return (coord == depthSample) ? 1.0F : ambient;
+ case GL_NOTEQUAL:
+ return (coord != depthSample) ? 1.0F : ambient;
+ case GL_ALWAYS:
+ return 1.0F;
+ case GL_NEVER:
+ return ambient;
+ case GL_NONE:
+ return depthSample;
+ default:
+ _mesa_problem(NULL, "Bad compare func in shadow_compare");
+ return ambient;
+ }
+}
+
+/**
+ * Compare texcoord against four depth samples.
+ */
+static INLINE GLfloat
+shadow_compare4(GLenum function, GLfloat coord,
+ GLfloat depth00, GLfloat depth01,
+ GLfloat depth10, GLfloat depth11,
+ GLfloat ambient, GLfloat wi, GLfloat wj)
+{
+ const GLfloat d = (1.0F - (GLfloat) ambient) * 0.25F;
+ GLfloat luminance = 1.0F;
+
+ switch (function) {
+ case GL_LEQUAL:
+ if (depth00 <= coord) luminance -= d;
+ if (depth01 <= coord) luminance -= d;
+ if (depth10 <= coord) luminance -= d;
+ if (depth11 <= coord) luminance -= d;
+ return luminance;
+ case GL_GEQUAL:
+ if (depth00 >= coord) luminance -= d;
+ if (depth01 >= coord) luminance -= d;
+ if (depth10 >= coord) luminance -= d;
+ if (depth11 >= coord) luminance -= d;
+ return luminance;
+ case GL_LESS:
+ if (depth00 < coord) luminance -= d;
+ if (depth01 < coord) luminance -= d;
+ if (depth10 < coord) luminance -= d;
+ if (depth11 < coord) luminance -= d;
+ return luminance;
+ case GL_GREATER:
+ if (depth00 > coord) luminance -= d;
+ if (depth01 > coord) luminance -= d;
+ if (depth10 > coord) luminance -= d;
+ if (depth11 > coord) luminance -= d;
+ return luminance;
+ case GL_EQUAL:
+ if (depth00 == coord) luminance -= d;
+ if (depth01 == coord) luminance -= d;
+ if (depth10 == coord) luminance -= d;
+ if (depth11 == coord) luminance -= d;
+ return luminance;
+ case GL_NOTEQUAL:
+ if (depth00 != coord) luminance -= d;
+ if (depth01 != coord) luminance -= d;
+ if (depth10 != coord) luminance -= d;
+ if (depth11 != coord) luminance -= d;
+ return luminance;
+ case GL_ALWAYS:
+ return 0.0;
+ case GL_NEVER:
+ return ambient;
+ case GL_NONE:
+ /* ordinary bilinear filtering */
+ return lerp_2d(wi, wj, depth00, depth10, depth01, depth11);
+ default:
+ _mesa_problem(NULL, "Bad compare func in sample_depth_texture");
+ return 0.0F;
+ }
+}
-/*
+
+/**
* Sample a shadow/depth texture.
*/
static void
sample_depth_texture( GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan texel[][4] )
+ GLfloat texel[][4] )
{
const GLint baseLevel = tObj->BaseLevel;
const struct gl_texture_image *img = tObj->Image[0][baseLevel];
const GLint depth = img->Depth;
const GLuint compare_coord = (tObj->Target == GL_TEXTURE_2D_ARRAY_EXT)
? 3 : 2;
- GLchan ambient;
+ GLfloat ambient;
GLenum function;
- GLchan result;
+ GLfloat result;
(void) lambda;
tObj->Target == GL_TEXTURE_1D_ARRAY_EXT ||
tObj->Target == GL_TEXTURE_2D_ARRAY_EXT);
- UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
+ ambient = tObj->CompareFailValue;
/* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */
- function = tObj->_Function;
+ function = (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) ?
+ tObj->CompareFunc : GL_NONE;
+
if (tObj->MagFilter == GL_NEAREST) {
GLuint i;
for (i = 0; i < n; i++) {
GLfloat depthSample;
GLint col, row, slice;
- switch (tObj->Target) {
- case GL_TEXTURE_RECTANGLE_ARB:
- col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width);
- row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
- slice = 0;
- break;
-
- case GL_TEXTURE_1D:
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0],
- width, col);
- row = 0;
- slice = 0;
- break;
-
- case GL_TEXTURE_2D:
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0],
- width, col);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1],
- height, row);
- slice = 0;
- break;
-
- case GL_TEXTURE_1D_ARRAY_EXT:
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0],
- width, col);
- row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
- slice = 0;
-
- case GL_TEXTURE_2D_ARRAY_EXT:
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0],
- width, col);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1],
- height, row);
- slice = clamp_rect_coord_nearest(tObj->WrapR, texcoords[i][2], depth);
- break;
- }
+ nearest_texcoord(tObj, texcoords[i], &col, &row, &slice);
if (col >= 0 && row >= 0 && col < width && row < height &&
slice >= 0 && slice < depth) {
depthSample = tObj->BorderColor[0];
}
- switch (function) {
- case GL_LEQUAL:
- result = (texcoords[i][compare_coord] <= depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_GEQUAL:
- result = (texcoords[i][compare_coord] >= depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_LESS:
- result = (texcoords[i][compare_coord] < depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_GREATER:
- result = (texcoords[i][compare_coord] > depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_EQUAL:
- result = (texcoords[i][compare_coord] == depthSample) ? CHAN_MAX : ambient;
- break;
- case GL_NOTEQUAL:
- result = (texcoords[i][compare_coord] != 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;
- }
+ result = shadow_compare(function, texcoords[i][compare_coord],
+ depthSample, ambient);
switch (tObj->DepthMode) {
case GL_LUMINANCE:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = CHAN_MAX;
+ ASSIGN_4V(texel[i], result, result, result, 1.0F);
break;
case GL_INTENSITY:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = result;
+ ASSIGN_4V(texel[i], result, result, result, result);
break;
case GL_ALPHA:
- texel[i][RCOMP] = 0;
- texel[i][GCOMP] = 0;
- texel[i][BCOMP] = 0;
- texel[i][ACOMP] = result;
+ ASSIGN_4V(texel[i], 0.0F, 0.0F, 0.0F, result);
break;
default:
_mesa_problem(ctx, "Bad depth texture mode");
GLfloat depth00, depth01, depth10, depth11;
GLint i0, i1, j0, j1;
GLint slice;
- GLfloat u, v;
+ GLfloat wi, wj;
GLuint useBorderTexel;
- switch (tObj->Target) {
- case GL_TEXTURE_RECTANGLE_ARB:
- clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0],
- width, &i0, &i1);
- clamp_rect_coord_linear(tObj->WrapT, texcoords[i][1],
- height, &j0, &j1);
- slice = 0;
- break;
-
- case GL_TEXTURE_1D:
- case GL_TEXTURE_2D:
- 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);
- slice = 0;
- break;
-
- case GL_TEXTURE_1D_ARRAY_EXT:
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoords[i][0],
- u, width, i0, i1);
- j0 = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
- j1 = j0;
- slice = 0;
-
- case GL_TEXTURE_2D_ARRAY_EXT:
- 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);
- slice = clamp_rect_coord_nearest(tObj->WrapR, texcoords[i][2], depth);
- break;
- }
+ linear_texcoord(tObj, texcoords[i], &i0, &i1, &j0, &j1, &slice,
+ &wi, &wj);
useBorderTexel = 0;
if (img->Border) {
}
}
- 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 depthSample
- = lerp_2d(a, b, depth00, depth10, depth01, depth11);
- if ((depthSample <= texcoords[i][compare_coord] && function == GL_LEQUAL) ||
- (depthSample >= texcoords[i][compare_coord] && 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][compare_coord]) luminance -= d;
- if (depth01 <= texcoords[i][compare_coord]) luminance -= d;
- if (depth10 <= texcoords[i][compare_coord]) luminance -= d;
- if (depth11 <= texcoords[i][compare_coord]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_GEQUAL:
- if (depth00 >= texcoords[i][compare_coord]) luminance -= d;
- if (depth01 >= texcoords[i][compare_coord]) luminance -= d;
- if (depth10 >= texcoords[i][compare_coord]) luminance -= d;
- if (depth11 >= texcoords[i][compare_coord]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_LESS:
- if (depth00 < texcoords[i][compare_coord]) luminance -= d;
- if (depth01 < texcoords[i][compare_coord]) luminance -= d;
- if (depth10 < texcoords[i][compare_coord]) luminance -= d;
- if (depth11 < texcoords[i][compare_coord]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_GREATER:
- if (depth00 > texcoords[i][compare_coord]) luminance -= d;
- if (depth01 > texcoords[i][compare_coord]) luminance -= d;
- if (depth10 > texcoords[i][compare_coord]) luminance -= d;
- if (depth11 > texcoords[i][compare_coord]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_EQUAL:
- if (depth00 == texcoords[i][compare_coord]) luminance -= d;
- if (depth01 == texcoords[i][compare_coord]) luminance -= d;
- if (depth10 == texcoords[i][compare_coord]) luminance -= d;
- if (depth11 == texcoords[i][compare_coord]) luminance -= d;
- result = (GLchan) luminance;
- break;
- case GL_NOTEQUAL:
- if (depth00 != texcoords[i][compare_coord]) luminance -= d;
- if (depth01 != texcoords[i][compare_coord]) luminance -= d;
- if (depth10 != texcoords[i][compare_coord]) luminance -= d;
- if (depth11 != texcoords[i][compare_coord]) 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 depthSample
- = lerp_2d(a, b, depth00, depth10, depth01, depth11);
- CLAMPED_FLOAT_TO_CHAN(result, depthSample);
- }
- break;
- default:
- _mesa_problem(ctx, "Bad compare func in sample_depth_texture");
- return;
- }
- }
+ result = shadow_compare4(function, texcoords[i][compare_coord],
+ depth00, depth01, depth10, depth11,
+ ambient, wi, wj);
switch (tObj->DepthMode) {
case GL_LUMINANCE:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = CHAN_MAX;
+ ASSIGN_4V(texel[i], result, result, result, 1.0F);
break;
case GL_INTENSITY:
- texel[i][RCOMP] = result;
- texel[i][GCOMP] = result;
- texel[i][BCOMP] = result;
- texel[i][ACOMP] = result;
+ ASSIGN_4V(texel[i], result, result, result, result);
break;
case GL_ALPHA:
- texel[i][RCOMP] = 0;
- texel[i][GCOMP] = 0;
- texel[i][BCOMP] = 0;
- texel[i][ACOMP] = result;
+ ASSIGN_4V(texel[i], 0.0F, 0.0F, 0.0F, 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, const 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[0][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->TexFormat->BaseFormat != 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;
- texImage->FetchTexelf(texImage, ii, jj, 0, &depthSample);
- 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.
* When a fragment program attempts to sample an incomplete texture we
null_sample_func( GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
const GLfloat texcoords[][4], const GLfloat lambda[],
- GLchan rgba[][4])
+ GLfloat rgba[][4])
{
GLuint i;
(void) ctx;
}
else {
/* check for a few optimized cases */
+#if 0
const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
ASSERT(t->MinFilter == GL_NEAREST);
if (t->WrapS == GL_REPEAT &&
img->TexFormat->MesaFormat == MESA_FORMAT_RGBA) {
return &opt_sample_rgba_2d;
}
+#else
+ if (0)
+ ;
+#endif
else {
return &sample_nearest_2d;
}
projects / mesa.git / blobdiff