aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c
diff options
context:
space:
mode:
authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
commitf4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch)
tree2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
downloadnx-libs-f4092abdf94af6a99aff944d6264bc1284e8bdd4.tar.gz
nx-libs-f4092abdf94af6a99aff944d6264bc1284e8bdd4.tar.bz2
nx-libs-f4092abdf94af6a99aff944d6264bc1284e8bdd4.zip
Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1
Summary: Imported nx-X11-3.1.0-1.tar.gz Keywords: Imported nx-X11-3.1.0-1.tar.gz into Git repository
Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c')
-rw-r--r--nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c3963
1 files changed, 3963 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c
new file mode 100644
index 000000000..c75d826d2
--- /dev/null
+++ b/nx-X11/extras/Mesa/src/mesa/swrast/s_texture.c
@@ -0,0 +1,3963 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.4
+ *
+ * Copyright (C) 1999-2005 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "glheader.h"
+#include "context.h"
+#include "colormac.h"
+#include "macros.h"
+#include "imports.h"
+#include "pixel.h"
+#include "texformat.h"
+#include "teximage.h"
+
+#include "s_context.h"
+#include "s_texture.h"
+
+
+/**
+ * Constants for integer linear interpolation.
+ */
+#define ILERP_SCALE 65536.0F
+#define ILERP_SHIFT 16
+
+
+/**
+ * Linear interpolation macros
+ */
+#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 float values.
+ * v00, v10, v01 and v11 are typically four texture samples in a square/box.
+ * a and b are the horizontal and vertical interpolants.
+ * It's important that this function is inlined when compiled with
+ * optimization! If we find that's not true on some systems, convert
+ * to a macro.
+ */
+static INLINE GLfloat
+lerp_2d(GLfloat a, GLfloat b,
+ GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11)
+{
+ const GLfloat temp0 = LERP(a, v00, v10);
+ const GLfloat temp1 = LERP(a, v01, v11);
+ return LERP(b, temp0, temp1);
+}
+
+
+/**
+ * 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
+ */
+static INLINE GLfloat
+lerp_3d(GLfloat a, GLfloat b, GLfloat c,
+ GLfloat v000, GLfloat v100, GLfloat v010, GLfloat v110,
+ GLfloat v001, GLfloat v101, GLfloat v011, GLfloat v111)
+{
+ const GLfloat temp00 = LERP(a, v000, v100);
+ const GLfloat temp10 = LERP(a, v010, v110);
+ const GLfloat temp01 = LERP(a, v001, v101);
+ const GLfloat temp11 = LERP(a, v011, v111);
+ const GLfloat temp0 = LERP(b, temp00, temp10);
+ const GLfloat temp1 = LERP(b, temp01, temp11);
+ return LERP(c, temp0, temp1);
+}
+
+
+/**
+ * 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);
+}
+
+
+
+/**
+ * Compute the remainder of a divided by b, but be careful with
+ * negative values so that GL_REPEAT mode works right.
+ */
+static INLINE GLint
+repeat_remainder(GLint a, GLint b)
+{
+ if (a >= 0)
+ return a % b;
+ else
+ return (a + 1) % b + b - 1;
+}
+
+
+/**
+ * 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
+ * Output:
+ * U = texcoord in [0, width]
+ * I0, I1 = two nearest texel indexes
+ */
+#define COMPUTE_LINEAR_TEXEL_LOCATIONS(wrapMode, S, U, SIZE, I0, I1) \
+{ \
+ if (wrapMode == GL_REPEAT) { \
+ U = S * SIZE - 0.5F; \
+ if (tObj->_IsPowerOfTwo) { \
+ I0 = IFLOOR(U) & (SIZE - 1); \
+ I1 = (I0 + 1) & (SIZE - 1); \
+ } \
+ else { \
+ I0 = repeat_remainder(IFLOOR(U), SIZE); \
+ I1 = repeat_remainder(I0 + 1, SIZE); \
+ } \
+ } \
+ else if (wrapMode == GL_CLAMP_TO_EDGE) { \
+ if (S <= 0.0F) \
+ U = 0.0F; \
+ else if (S >= 1.0F) \
+ U = (GLfloat) SIZE; \
+ else \
+ U = S * SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ if (I0 < 0) \
+ I0 = 0; \
+ if (I1 >= (GLint) SIZE) \
+ I1 = SIZE - 1; \
+ } \
+ else if (wrapMode == GL_CLAMP_TO_BORDER) { \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ if (S <= min) \
+ U = min * SIZE; \
+ else if (S >= max) \
+ U = max * SIZE; \
+ else \
+ U = S * SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ } \
+ else if (wrapMode == GL_MIRRORED_REPEAT) { \
+ 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; \
+ } \
+ else if (wrapMode == GL_MIRROR_CLAMP_EXT) { \
+ U = (GLfloat) fabs(S); \
+ if (U >= 1.0F) \
+ U = (GLfloat) SIZE; \
+ else \
+ U *= SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ } \
+ else if (wrapMode == GL_MIRROR_CLAMP_TO_EDGE_EXT) { \
+ U = (GLfloat) fabs(S); \
+ if (U >= 1.0F) \
+ U = (GLfloat) SIZE; \
+ else \
+ U *= SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ if (I0 < 0) \
+ I0 = 0; \
+ if (I1 >= (GLint) SIZE) \
+ I1 = SIZE - 1; \
+ } \
+ else if (wrapMode == GL_MIRROR_CLAMP_TO_BORDER_EXT) { \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ U = (GLfloat) fabs(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; \
+ } \
+ else { \
+ ASSERT(wrapMode == GL_CLAMP); \
+ if (S <= 0.0F) \
+ U = 0.0F; \
+ else if (S >= 1.0F) \
+ U = (GLfloat) SIZE; \
+ else \
+ U = S * SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ } \
+}
+
+
+/**
+ * Used to compute texel location for nearest sampling.
+ */
+#define COMPUTE_NEAREST_TEXEL_LOCATION(wrapMode, S, SIZE, I) \
+{ \
+ if (wrapMode == GL_REPEAT) { \
+ /* s limited to [0,1) */ \
+ /* i limited to [0,size-1] */ \
+ I = IFLOOR(S * SIZE); \
+ if (tObj->_IsPowerOfTwo) \
+ I &= (SIZE - 1); \
+ else \
+ I = repeat_remainder(I, SIZE); \
+ } \
+ else if (wrapMode == GL_CLAMP_TO_EDGE) { \
+ /* s limited to [min,max] */ \
+ /* i limited to [0, size-1] */ \
+ const GLfloat min = 1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ if (S < min) \
+ I = 0; \
+ else if (S > max) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(S * SIZE); \
+ } \
+ else if (wrapMode == GL_CLAMP_TO_BORDER) { \
+ /* s limited to [min,max] */ \
+ /* i limited to [-1, size] */ \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ if (S <= min) \
+ I = -1; \
+ else if (S >= max) \
+ I = SIZE; \
+ else \
+ I = IFLOOR(S * SIZE); \
+ } \
+ else if (wrapMode == GL_MIRRORED_REPEAT) { \
+ const GLfloat min = 1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ const GLint flr = IFLOOR(S); \
+ GLfloat u; \
+ if (flr & 1) \
+ u = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
+ else \
+ u = S - (GLfloat) flr; /* flr is even */ \
+ if (u < min) \
+ I = 0; \
+ else if (u > max) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ else if (wrapMode == GL_MIRROR_CLAMP_EXT) { \
+ /* s limited to [0,1] */ \
+ /* i limited to [0,size-1] */ \
+ const GLfloat u = (GLfloat) fabs(S); \
+ if (u <= 0.0F) \
+ I = 0; \
+ else if (u >= 1.0F) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ else if (wrapMode == GL_MIRROR_CLAMP_TO_EDGE_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 = (GLfloat) fabs(S); \
+ if (u < min) \
+ I = 0; \
+ else if (u > max) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ else if (wrapMode == 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 = (GLfloat) fabs(S); \
+ if (u < min) \
+ I = -1; \
+ else if (u > max) \
+ I = SIZE; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ else { \
+ ASSERT(wrapMode == GL_CLAMP); \
+ /* s limited to [0,1] */ \
+ /* i limited to [0,size-1] */ \
+ if (S <= 0.0F) \
+ I = 0; \
+ else if (S >= 1.0F) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(S * SIZE); \
+ } \
+}
+
+
+/* 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); \
+}
+
+
+/*
+ * Compute linear mipmap levels for given lambda.
+ */
+#define COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level) \
+{ \
+ if (lambda < 0.0F) \
+ level = tObj->BaseLevel; \
+ else if (lambda > tObj->_MaxLambda) \
+ level = (GLint) (tObj->BaseLevel + tObj->_MaxLambda); \
+ else \
+ level = (GLint) (tObj->BaseLevel + lambda); \
+}
+
+
+/*
+ * Compute nearest mipmap level for given lambda.
+ */
+#define COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level) \
+{ \
+ GLfloat l; \
+ if (lambda <= 0.5F) \
+ l = 0.0F; \
+ else if (lambda > tObj->_MaxLambda + 0.4999F) \
+ l = tObj->_MaxLambda + 0.4999F; \
+ else \
+ l = lambda; \
+ level = (GLint) (tObj->BaseLevel + l + 0.5F); \
+ if (level > tObj->_MaxLevel) \
+ level = tObj->_MaxLevel; \
+}
+
+
+
+/*
+ * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
+ * see 1-pixel bands of improperly weighted linear-sampled texels. The
+ * tests/texwrap.c demo is a good test.
+ * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
+ * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
+ */
+#define FRAC(f) ((f) - IFLOOR(f))
+
+
+
+/*
+ * Bitflags for texture border color sampling.
+ */
+#define I0BIT 1
+#define I1BIT 2
+#define J0BIT 4
+#define J1BIT 8
+#define K0BIT 16
+#define K1BIT 32
+
+
+
+/*
+ * The lambda[] array values are always monotonic. Either the whole span
+ * will be minified, magnified, or split between the two. This function
+ * determines the subranges in [0, n-1] that are to be minified or magnified.
+ */
+static INLINE void
+compute_min_mag_ranges( GLfloat minMagThresh, GLuint n, const GLfloat lambda[],
+ GLuint *minStart, GLuint *minEnd,
+ GLuint *magStart, GLuint *magEnd )
+{
+ ASSERT(lambda != NULL);
+#if 0
+ /* Verify that lambda[] is monotonous.
+ * We can't really use this because the inaccuracy in the LOG2 function
+ * causes this test to fail, yet the resulting texturing is correct.
+ */
+ if (n > 1) {
+ GLuint i;
+ printf("lambda delta = %g\n", lambda[0] - lambda[n-1]);
+ if (lambda[0] >= lambda[n-1]) { /* decreasing */
+ for (i = 0; i < n - 1; i++) {
+ ASSERT((GLint) (lambda[i] * 10) >= (GLint) (lambda[i+1] * 10));
+ }
+ }
+ else { /* increasing */
+ for (i = 0; i < n - 1; i++) {
+ ASSERT((GLint) (lambda[i] * 10) <= (GLint) (lambda[i+1] * 10));
+ }
+ }
+ }
+#endif /* DEBUG */
+
+ /* since lambda is monotonous-array use this check first */
+ if (lambda[0] <= minMagThresh && lambda[n-1] <= minMagThresh) {
+ /* magnification for whole span */
+ *magStart = 0;
+ *magEnd = n;
+ *minStart = *minEnd = 0;
+ }
+ else if (lambda[0] > minMagThresh && lambda[n-1] > minMagThresh) {
+ /* minification for whole span */
+ *minStart = 0;
+ *minEnd = n;
+ *magStart = *magEnd = 0;
+ }
+ else {
+ /* a mix of minification and magnification */
+ GLuint i;
+ if (lambda[0] > minMagThresh) {
+ /* start with minification */
+ for (i = 1; i < n; i++) {
+ if (lambda[i] <= minMagThresh)
+ break;
+ }
+ *minStart = 0;
+ *minEnd = i;
+ *magStart = i;
+ *magEnd = n;
+ }
+ else {
+ /* start with magnification */
+ for (i = 1; i < n; i++) {
+ if (lambda[i] > minMagThresh)
+ break;
+ }
+ *magStart = 0;
+ *magEnd = i;
+ *minStart = i;
+ *minEnd = n;
+ }
+ }
+
+#if 0
+ /* Verify the min/mag Start/End values
+ * We don't use this either (see above)
+ */
+ {
+ GLint i;
+ for (i = 0; i < n; i++) {
+ if (lambda[i] > minMagThresh) {
+ /* minification */
+ ASSERT(i >= *minStart);
+ ASSERT(i < *minEnd);
+ }
+ else {
+ /* magnification */
+ ASSERT(i >= *magStart);
+ ASSERT(i < *magEnd);
+ }
+ }
+ }
+#endif
+}
+
+
+/**********************************************************************/
+/* 1-D Texture Sampling Functions */
+/**********************************************************************/
+
+/*
+ * Return the texture sample for coordinate (s) using GL_NEAREST filter.
+ */
+static void
+sample_1d_nearest(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4], GLchan rgba[4])
+{
+ const GLint width = img->Width2; /* without border, power of two */
+ GLint i;
+ (void) ctx;
+
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
+
+ /* 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);
+ }
+ else {
+ img->FetchTexelc(img, i, 0, 0, rgba);
+ }
+}
+
+
+
+/*
+ * Return the texture sample for coordinate (s) using GL_LINEAR filter.
+ */
+static void
+sample_1d_linear(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4], GLchan rgba[4])
+{
+ const GLint width = img->Width2;
+ GLint i0, i1;
+ GLfloat u;
+ GLuint useBorderColor;
+ (void) ctx;
+
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
+
+ useBorderColor = 0;
+ if (img->Border) {
+ i0 += img->Border;
+ i1 += img->Border;
+ }
+ else {
+ if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
+ if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
+ }
+
+ {
+ const GLfloat a = FRAC(u);
+ GLchan t0[4], t1[4]; /* texels */
+
+ /* fetch texel colors */
+ if (useBorderColor & I0BIT) {
+ COPY_CHAN4(t0, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, 0, 0, t0);
+ }
+ if (useBorderColor & I1BIT) {
+ COPY_CHAN4(t1, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, 0, 0, t1);
+ }
+
+ /* do linear interpolation of texel colors */
+#if CHAN_TYPE == GL_FLOAT
+ rgba[0] = LERP(a, t0[0], t1[0]);
+ rgba[1] = LERP(a, t0[1], t1[1]);
+ rgba[2] = LERP(a, t0[2], t1[2]);
+ rgba[3] = LERP(a, t0[3], t1[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ rgba[0] = (GLchan) (LERP(a, t0[0], t1[0]) + 0.5);
+ rgba[1] = (GLchan) (LERP(a, t0[1], t1[1]) + 0.5);
+ rgba[2] = (GLchan) (LERP(a, t0[2], t1[2]) + 0.5);
+ rgba[3] = (GLchan) (LERP(a, t0[3], t1[3]) + 0.5);
+#else
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ {
+ /* fixed point interpolants in [0, ILERP_SCALE] */
+ const GLint ia = IROUND_POS(a * ILERP_SCALE);
+ rgba[0] = ILERP(ia, t0[0], t1[0]);
+ rgba[1] = ILERP(ia, t0[1], t1[1]);
+ rgba[2] = ILERP(ia, t0[2], t1[2]);
+ rgba[3] = ILERP(ia, t0[3], t1[3]);
+ }
+#endif
+ }
+}
+
+
+static void
+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])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ sample_1d_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
+ }
+}
+
+
+static void
+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])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ sample_1d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
+ }
+}
+
+
+
+/*
+ * This is really just needed in order to prevent warnings with some compilers.
+ */
+#if CHAN_TYPE == GL_FLOAT
+#define CHAN_CAST
+#else
+#define CHAN_CAST (GLchan) (GLint)
+#endif
+
+
+static void
+sample_1d_nearest_mipmap_linear(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_1d_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4];
+ const GLfloat f = FRAC(lambda[i]);
+ sample_1d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_1d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+
+static void
+sample_1d_linear_mipmap_linear(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_1d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4];
+ const GLfloat f = FRAC(lambda[i]);
+ sample_1d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_1d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+
+static void
+sample_nearest_1d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4] )
+{
+ GLuint i;
+ struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ (void) texUnit;
+ (void) lambda;
+ for (i=0;i<n;i++) {
+ sample_1d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
+ }
+}
+
+
+
+static void
+sample_linear_1d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4] )
+{
+ GLuint i;
+ struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ (void) texUnit;
+ (void) lambda;
+ 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.
+ *
+ */
+static void
+sample_lambda_1d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4] )
+{
+ GLuint minStart, minEnd; /* texels with minification */
+ GLuint magStart, magEnd; /* texels with magnification */
+ GLuint i;
+
+ ASSERT(lambda != NULL);
+ compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
+ n, lambda, &minStart, &minEnd, &magStart, &magEnd);
+
+ if (minStart < minEnd) {
+ /* do the minified texels */
+ const GLuint m = minEnd - minStart;
+ switch (tObj->MinFilter) {
+ case GL_NEAREST:
+ for (i = minStart; i < minEnd; i++)
+ sample_1d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ case GL_LINEAR:
+ for (i = minStart; i < minEnd; i++)
+ sample_1d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ case GL_NEAREST_MIPMAP_NEAREST:
+ sample_1d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_NEAREST:
+ sample_1d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_NEAREST_MIPMAP_LINEAR:
+ sample_1d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_LINEAR:
+ sample_1d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad min filter in sample_1d_texture");
+ return;
+ }
+ }
+
+ if (magStart < magEnd) {
+ /* do the magnified texels */
+ switch (tObj->MagFilter) {
+ case GL_NEAREST:
+ for (i = magStart; i < magEnd; i++)
+ sample_1d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ case GL_LINEAR:
+ for (i = magStart; i < magEnd; i++)
+ sample_1d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad mag filter in sample_1d_texture");
+ return;
+ }
+ }
+}
+
+
+/**********************************************************************/
+/* 2-D Texture Sampling Functions */
+/**********************************************************************/
+
+
+/*
+ * Return the texture sample for coordinate (s,t) using GL_NEAREST filter.
+ */
+static INLINE void
+sample_2d_nearest(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4],
+ GLchan rgba[])
+{
+ const GLint width = img->Width2; /* without border, power of two */
+ const GLint height = img->Height2; /* without border, power of two */
+ GLint i, j;
+ (void) ctx;
+
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoord[0], width, i);
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoord[1], height, j);
+
+ /* skip over the border, if any */
+ i += img->Border;
+ j += 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);
+ }
+ else {
+ img->FetchTexelc(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>.
+ */
+static INLINE void
+sample_2d_linear(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4],
+ GLchan rgba[])
+{
+ const GLint width = img->Width2;
+ const GLint height = img->Height2;
+ GLint i0, j0, i1, j1;
+ GLuint useBorderColor;
+ GLfloat u, v;
+ (void) ctx;
+
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoord[1], v, height, j0, j1);
+
+ useBorderColor = 0;
+ if (img->Border) {
+ i0 += img->Border;
+ i1 += img->Border;
+ j0 += img->Border;
+ j1 += img->Border;
+ }
+ else {
+ if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
+ if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
+ if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
+ if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
+ }
+
+ {
+ const GLfloat a = FRAC(u);
+ const GLfloat b = FRAC(v);
+#if CHAN_TYPE == GL_UNSIGNED_BYTE
+ const GLint ia = IROUND_POS(a * ILERP_SCALE);
+ const GLint ib = IROUND_POS(b * ILERP_SCALE);
+#endif
+ GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
+
+ /* fetch four texel colors */
+ if (useBorderColor & (I0BIT | J0BIT)) {
+ COPY_CHAN4(t00, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, j0, 0, t00);
+ }
+ if (useBorderColor & (I1BIT | J0BIT)) {
+ COPY_CHAN4(t10, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, j0, 0, t10);
+ }
+ if (useBorderColor & (I0BIT | J1BIT)) {
+ COPY_CHAN4(t01, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, j1, 0, t01);
+ }
+ if (useBorderColor & (I1BIT | J1BIT)) {
+ COPY_CHAN4(t11, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, j1, 0, t11);
+ }
+
+ /* do bilinear interpolation of texel colors */
+#if CHAN_TYPE == GL_FLOAT
+ rgba[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
+ rgba[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
+ rgba[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
+ rgba[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ rgba[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
+ rgba[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
+ rgba[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
+ rgba[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
+#else
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ rgba[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
+ rgba[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
+ rgba[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
+ rgba[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
+#endif
+ }
+}
+
+
+/*
+ * As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT.
+ */
+static INLINE void
+sample_2d_linear_repeat(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4],
+ GLchan rgba[])
+{
+ const GLint width = img->Width2;
+ const GLint height = img->Height2;
+ GLint i0, j0, i1, j1;
+ GLfloat u, v;
+ (void) ctx;
+ (void) tObj;
+
+ ASSERT(tObj->WrapS == GL_REPEAT);
+ ASSERT(tObj->WrapT == GL_REPEAT);
+ ASSERT(img->Border == 0);
+ ASSERT(img->Format != 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);
+
+ {
+ const GLfloat a = FRAC(u);
+ const GLfloat b = FRAC(v);
+#if CHAN_TYPE == GL_UNSIGNED_BYTE
+ const GLint ia = IROUND_POS(a * ILERP_SCALE);
+ const GLint ib = IROUND_POS(b * ILERP_SCALE);
+#endif
+ GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
+
+ 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);
+
+ /* do bilinear interpolation of texel colors */
+#if CHAN_TYPE == GL_FLOAT
+ rgba[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
+ rgba[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
+ rgba[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
+ rgba[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ rgba[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
+ rgba[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
+ rgba[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
+ rgba[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
+#else
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ rgba[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
+ rgba[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
+ rgba[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
+ rgba[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
+#endif
+ }
+}
+
+
+
+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])
+{
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ sample_2d_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[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])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ sample_2d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
+ }
+}
+
+
+
+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])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_2d_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4]; /* texels */
+ const GLfloat f = FRAC(lambda[i]);
+ sample_2d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_2d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+
+/* 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] )
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_2d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4]; /* texels */
+ const GLfloat f = FRAC(lambda[i]);
+ sample_2d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_2d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+static void
+sample_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] )
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ ASSERT(tObj->WrapS == GL_REPEAT);
+ ASSERT(tObj->WrapT == GL_REPEAT);
+ ASSERT(tObj->_IsPowerOfTwo);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4]; /* texels */
+ const GLfloat f = FRAC(lambda[i]);
+ sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+static void
+sample_nearest_2d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4] )
+{
+ GLuint i;
+ struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ (void) texUnit;
+ (void) lambda;
+ for (i=0;i<n;i++) {
+ sample_2d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
+ }
+}
+
+
+
+static void
+sample_linear_2d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4] )
+{
+ GLuint i;
+ struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ (void) texUnit;
+ (void) lambda;
+ if (tObj->WrapS == GL_REPEAT && tObj->WrapT == GL_REPEAT
+ && image->Border == 0) {
+ for (i=0;i<n;i++) {
+ sample_2d_linear_repeat(ctx, tObj, image, texcoords[i], rgba[i]);
+ }
+ }
+ else {
+ 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
+ * No border,
+ * RowStride == Width,
+ * Format = GL_RGB
+ */
+static void
+opt_sample_rgb_2d( GLcontext *ctx, GLuint texUnit,
+ 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 GLfloat height = (GLfloat) img->Height;
+ const GLint colMask = img->Width - 1;
+ const GLint rowMask = img->Height - 1;
+ const GLint shift = img->WidthLog2;
+ GLuint k;
+ (void) ctx;
+ (void) texUnit;
+ (void) lambda;
+ ASSERT(tObj->WrapS==GL_REPEAT);
+ ASSERT(tObj->WrapT==GL_REPEAT);
+ ASSERT(img->Border==0);
+ ASSERT(img->Format==GL_RGB);
+ ASSERT(img->_IsPowerOfTwo);
+
+ for (k=0; k<n; k++) {
+ GLint i = IFLOOR(texcoords[k][0] * width) & colMask;
+ GLint j = IFLOOR(texcoords[k][1] * height) & rowMask;
+ GLint pos = (j << shift) | i;
+ GLchan *texel = ((GLchan *) img->Data) + 3*pos;
+ rgba[k][RCOMP] = texel[0];
+ rgba[k][GCOMP] = texel[1];
+ rgba[k][BCOMP] = texel[2];
+ }
+}
+
+
+/*
+ * Optimized 2-D texture sampling:
+ * S and T wrap mode == GL_REPEAT
+ * GL_NEAREST min/mag filter
+ * No border
+ * RowStride == Width,
+ * Format = GL_RGBA
+ */
+static void
+opt_sample_rgba_2d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj,
+ GLuint n, 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 GLfloat height = (GLfloat) img->Height;
+ const GLint colMask = img->Width - 1;
+ const GLint rowMask = img->Height - 1;
+ const GLint shift = img->WidthLog2;
+ GLuint i;
+ (void) ctx;
+ (void) texUnit;
+ (void) lambda;
+ ASSERT(tObj->WrapS==GL_REPEAT);
+ ASSERT(tObj->WrapT==GL_REPEAT);
+ ASSERT(img->Border==0);
+ ASSERT(img->Format==GL_RGBA);
+ ASSERT(img->_IsPowerOfTwo);
+
+ for (i = 0; i < n; i++) {
+ const GLint col = IFLOOR(texcoords[i][0] * width) & colMask;
+ const GLint row = IFLOOR(texcoords[i][1] * height) & rowMask;
+ const GLint pos = (row << shift) | col;
+ const GLchan *texel = ((GLchan *) img->Data) + (pos << 2); /* pos*4 */
+ COPY_CHAN4(rgba[i], texel);
+ }
+}
+
+
+/*
+ * Given an array of texture coordinate and lambda (level of detail)
+ * values, return an array of texture sample.
+ */
+static void
+sample_lambda_2d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4] )
+{
+ const struct gl_texture_image *tImg = tObj->Image[0][tObj->BaseLevel];
+ GLuint minStart, minEnd; /* texels with minification */
+ GLuint magStart, magEnd; /* texels with magnification */
+
+ const GLboolean repeatNoBorderPOT = (tObj->WrapS == GL_REPEAT)
+ && (tObj->WrapT == GL_REPEAT)
+ && (tImg->Border == 0 && (tImg->Width == tImg->RowStride))
+ && (tImg->Format != GL_COLOR_INDEX)
+ && tImg->_IsPowerOfTwo;
+
+ ASSERT(lambda != NULL);
+ compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
+ n, lambda, &minStart, &minEnd, &magStart, &magEnd);
+
+ if (minStart < minEnd) {
+ /* do the minified texels */
+ const GLuint m = minEnd - minStart;
+ switch (tObj->MinFilter) {
+ case GL_NEAREST:
+ if (repeatNoBorderPOT) {
+ switch (tImg->TexFormat->MesaFormat) {
+ case MESA_FORMAT_RGB:
+ case MESA_FORMAT_RGB888:
+ /*case MESA_FORMAT_BGR888:*/
+ opt_sample_rgb_2d(ctx, texUnit, tObj, m, texcoords + minStart,
+ NULL, rgba + minStart);
+ break;
+ case MESA_FORMAT_RGBA:
+ case MESA_FORMAT_RGBA8888:
+ case MESA_FORMAT_ARGB8888:
+ /*case MESA_FORMAT_ABGR8888:*/
+ /*case MESA_FORMAT_BGRA8888:*/
+ opt_sample_rgba_2d(ctx, texUnit, tObj, m, texcoords + minStart,
+ NULL, rgba + minStart);
+ break;
+ default:
+ sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + minStart,
+ NULL, rgba + minStart );
+ }
+ }
+ else {
+ sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + minStart,
+ NULL, rgba + minStart);
+ }
+ break;
+ case GL_LINEAR:
+ sample_linear_2d(ctx, texUnit, tObj, m, texcoords + minStart,
+ NULL, rgba + minStart);
+ break;
+ case GL_NEAREST_MIPMAP_NEAREST:
+ sample_2d_nearest_mipmap_nearest(ctx, tObj, m,
+ texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_NEAREST:
+ sample_2d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_NEAREST_MIPMAP_LINEAR:
+ sample_2d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_LINEAR:
+ if (repeatNoBorderPOT)
+ sample_2d_linear_mipmap_linear_repeat(ctx, tObj, m,
+ texcoords + minStart, lambda + minStart, rgba + minStart);
+ else
+ sample_2d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad min filter in sample_2d_texture");
+ return;
+ }
+ }
+
+ if (magStart < magEnd) {
+ /* do the magnified texels */
+ const GLuint m = magEnd - magStart;
+
+ switch (tObj->MagFilter) {
+ case GL_NEAREST:
+ if (repeatNoBorderPOT) {
+ switch (tImg->TexFormat->MesaFormat) {
+ case MESA_FORMAT_RGB:
+ case MESA_FORMAT_RGB888:
+ /*case MESA_FORMAT_BGR888:*/
+ opt_sample_rgb_2d(ctx, texUnit, tObj, m, texcoords + magStart,
+ NULL, rgba + magStart);
+ break;
+ case MESA_FORMAT_RGBA:
+ case MESA_FORMAT_RGBA8888:
+ case MESA_FORMAT_ARGB8888:
+ /*case MESA_FORMAT_ABGR8888:*/
+ /*case MESA_FORMAT_BGRA8888:*/
+ opt_sample_rgba_2d(ctx, texUnit, tObj, m, texcoords + magStart,
+ NULL, rgba + magStart);
+ break;
+ default:
+ sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + magStart,
+ NULL, rgba + magStart );
+ }
+ }
+ else {
+ sample_nearest_2d(ctx, texUnit, tObj, m, texcoords + magStart,
+ NULL, rgba + magStart);
+ }
+ break;
+ case GL_LINEAR:
+ sample_linear_2d(ctx, texUnit, tObj, m, texcoords + magStart,
+ NULL, rgba + magStart);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad mag filter in sample_lambda_2d");
+ }
+ }
+}
+
+
+
+/**********************************************************************/
+/* 3-D Texture Sampling Functions */
+/**********************************************************************/
+
+/*
+ * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
+ */
+static void
+sample_3d_nearest(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4],
+ GLchan rgba[4])
+{
+ const GLint width = img->Width2; /* without border, power of two */
+ const GLint height = img->Height2; /* without border, power of two */
+ const GLint depth = img->Depth2; /* without border, power of two */
+ GLint i, j, k;
+ (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);
+
+ 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);
+ }
+ else {
+ img->FetchTexelc(img, i, j, k, rgba);
+ }
+}
+
+
+
+/*
+ * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter.
+ */
+static void
+sample_3d_linear(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ const struct gl_texture_image *img,
+ const GLfloat texcoord[4],
+ GLchan rgba[4])
+{
+ const GLint width = img->Width2;
+ const GLint height = img->Height2;
+ const GLint depth = img->Depth2;
+ GLint i0, j0, k0, i1, j1, k1;
+ GLuint useBorderColor;
+ GLfloat u, v, w;
+ (void) ctx;
+
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoord[0], u, width, i0, i1);
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoord[1], v, height, j0, j1);
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapR, texcoord[2], w, depth, k0, k1);
+
+ useBorderColor = 0;
+ if (img->Border) {
+ i0 += img->Border;
+ i1 += img->Border;
+ j0 += img->Border;
+ j1 += img->Border;
+ k0 += img->Border;
+ k1 += img->Border;
+ }
+ else {
+ /* check if sampling texture border color */
+ if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT;
+ if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT;
+ if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT;
+ if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT;
+ if (k0 < 0 || k0 >= depth) useBorderColor |= K0BIT;
+ if (k1 < 0 || k1 >= depth) useBorderColor |= K1BIT;
+ }
+
+ {
+ const GLfloat a = FRAC(u);
+ const GLfloat b = FRAC(v);
+ const GLfloat c = FRAC(w);
+#if CHAN_TYPE == GL_UNSIGNED_BYTE
+ const GLint ia = IROUND_POS(a * ILERP_SCALE);
+ const GLint ib = IROUND_POS(b * ILERP_SCALE);
+ const GLint ic = IROUND_POS(c * ILERP_SCALE);
+#endif
+ GLchan t000[4], t010[4], t001[4], t011[4];
+ GLchan t100[4], t110[4], t101[4], t111[4];
+
+ /* Fetch texels */
+ if (useBorderColor & (I0BIT | J0BIT | K0BIT)) {
+ COPY_CHAN4(t000, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, j0, k0, t000);
+ }
+ if (useBorderColor & (I1BIT | J0BIT | K0BIT)) {
+ COPY_CHAN4(t100, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, j0, k0, t100);
+ }
+ if (useBorderColor & (I0BIT | J1BIT | K0BIT)) {
+ COPY_CHAN4(t010, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, j1, k0, t010);
+ }
+ if (useBorderColor & (I1BIT | J1BIT | K0BIT)) {
+ COPY_CHAN4(t110, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, j1, k0, t110);
+ }
+
+ if (useBorderColor & (I0BIT | J0BIT | K1BIT)) {
+ COPY_CHAN4(t001, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, j0, k1, t001);
+ }
+ if (useBorderColor & (I1BIT | J0BIT | K1BIT)) {
+ COPY_CHAN4(t101, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, j0, k1, t101);
+ }
+ if (useBorderColor & (I0BIT | J1BIT | K1BIT)) {
+ COPY_CHAN4(t011, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i0, j1, k1, t011);
+ }
+ if (useBorderColor & (I1BIT | J1BIT | K1BIT)) {
+ COPY_CHAN4(t111, tObj->_BorderChan);
+ }
+ else {
+ img->FetchTexelc(img, i1, j1, k1, t111);
+ }
+
+ /* trilinear interpolation of samples */
+#if CHAN_TYPE == GL_FLOAT
+ rgba[0] = lerp_3d(a, b, c,
+ t000[0], t100[0], t010[0], t110[0],
+ t001[0], t101[0], t011[0], t111[0]);
+ rgba[1] = lerp_3d(a, b, c,
+ t000[1], t100[1], t010[1], t110[1],
+ t001[1], t101[1], t011[1], t111[1]);
+ rgba[2] = lerp_3d(a, b, c,
+ t000[2], t100[2], t010[2], t110[2],
+ t001[2], t101[2], t011[2], t111[2]);
+ rgba[3] = lerp_3d(a, b, c,
+ t000[3], t100[3], t010[3], t110[3],
+ t001[3], t101[3], t011[3], t111[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ rgba[0] = (GLchan) (lerp_3d(a, b, c,
+ t000[0], t100[0], t010[0], t110[0],
+ t001[0], t101[0], t011[0], t111[0]) + 0.5F);
+ rgba[1] = (GLchan) (lerp_3d(a, b, c,
+ t000[1], t100[1], t010[1], t110[1],
+ t001[1], t101[1], t011[1], t111[1]) + 0.5F);
+ rgba[2] = (GLchan) (lerp_3d(a, b, c,
+ t000[2], t100[2], t010[2], t110[2],
+ t001[2], t101[2], t011[2], t111[2]) + 0.5F);
+ rgba[3] = (GLchan) (lerp_3d(a, b, c,
+ t000[3], t100[3], t010[3], t110[3],
+ t001[3], t101[3], t011[3], t111[3]) + 0.5F);
+#else
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ rgba[0] = ilerp_3d(ia, ib, ic,
+ t000[0], t100[0], t010[0], t110[0],
+ t001[0], t101[0], t011[0], t111[0]);
+ rgba[1] = ilerp_3d(ia, ib, ic,
+ t000[1], t100[1], t010[1], t110[1],
+ t001[1], t101[1], t011[1], t111[1]);
+ rgba[2] = ilerp_3d(ia, ib, ic,
+ t000[2], t100[2], t010[2], t110[2],
+ t001[2], t101[2], t011[2], t111[2]);
+ rgba[3] = ilerp_3d(ia, ib, ic,
+ t000[3], t100[3], t010[3], t110[3],
+ t001[3], t101[3], t011[3], t111[3]);
+#endif
+ }
+}
+
+
+
+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] )
+{
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ sample_3d_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
+ }
+}
+
+
+static void
+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])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ sample_3d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]);
+ }
+}
+
+
+static void
+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])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_3d_nearest(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4]; /* texels */
+ const GLfloat f = FRAC(lambda[i]);
+ sample_3d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_3d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+static void
+sample_3d_linear_mipmap_linear(GLcontext *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ if (level >= tObj->_MaxLevel) {
+ sample_3d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoord[i], rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4]; /* texels */
+ const GLfloat f = FRAC(lambda[i]);
+ sample_3d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
+ sample_3d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+static void
+sample_nearest_3d(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4])
+{
+ GLuint i;
+ struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ (void) texUnit;
+ (void) lambda;
+ for (i=0;i<n;i++) {
+ sample_3d_nearest(ctx, tObj, image, texcoords[i], rgba[i]);
+ }
+}
+
+
+
+static void
+sample_linear_3d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4] )
+{
+ GLuint i;
+ struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ (void) texUnit;
+ (void) lambda;
+ for (i=0;i<n;i++) {
+ sample_3d_linear(ctx, tObj, image, texcoords[i], rgba[i]);
+ }
+}
+
+
+/*
+ * Given an (s,t,r) texture coordinate and lambda (level of detail) value,
+ * return a texture sample.
+ */
+static void
+sample_lambda_3d( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4] )
+{
+ GLuint minStart, minEnd; /* texels with minification */
+ GLuint magStart, magEnd; /* texels with magnification */
+ GLuint i;
+
+ ASSERT(lambda != NULL);
+ compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
+ n, lambda, &minStart, &minEnd, &magStart, &magEnd);
+
+ if (minStart < minEnd) {
+ /* do the minified texels */
+ GLuint m = minEnd - minStart;
+ switch (tObj->MinFilter) {
+ case GL_NEAREST:
+ for (i = minStart; i < minEnd; i++)
+ sample_3d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ case GL_LINEAR:
+ for (i = minStart; i < minEnd; i++)
+ sample_3d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ case GL_NEAREST_MIPMAP_NEAREST:
+ sample_3d_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_NEAREST:
+ sample_3d_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_NEAREST_MIPMAP_LINEAR:
+ sample_3d_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_LINEAR:
+ sample_3d_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad min filter in sample_3d_texture");
+ return;
+ }
+ }
+
+ if (magStart < magEnd) {
+ /* do the magnified texels */
+ switch (tObj->MagFilter) {
+ case GL_NEAREST:
+ for (i = magStart; i < magEnd; i++)
+ sample_3d_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ case GL_LINEAR:
+ for (i = magStart; i < magEnd; i++)
+ sample_3d_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel],
+ texcoords[i], rgba[i]);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad mag filter in sample_3d_texture");
+ return;
+ }
+ }
+}
+
+
+/**********************************************************************/
+/* Texture Cube Map Sampling Functions */
+/**********************************************************************/
+
+/*
+ * Choose one of six sides of a texture cube map given the texture
+ * coord (rx,ry,rz). Return pointer to corresponding array of texture
+ * images.
+ */
+static const struct gl_texture_image **
+choose_cube_face(const struct gl_texture_object *texObj,
+ const GLfloat texcoord[4], GLfloat newCoord[4])
+{
+/*
+ major axis
+ direction target sc tc ma
+ ---------- ------------------------------- --- --- ---
+ +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
+ -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
+ +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
+ -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
+ +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
+ -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
+*/
+ const GLfloat rx = texcoord[0];
+ const GLfloat ry = texcoord[1];
+ const GLfloat rz = texcoord[2];
+ const struct gl_texture_image **imgArray;
+ const GLfloat arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz);
+ GLfloat sc, tc, ma;
+
+ if (arx > ary && arx > arz) {
+ if (rx >= 0.0F) {
+ imgArray = (const struct gl_texture_image **) texObj->Image[FACE_POS_X];
+ sc = -rz;
+ tc = -ry;
+ ma = arx;
+ }
+ else {
+ imgArray = (const struct gl_texture_image **) texObj->Image[FACE_NEG_X];
+ sc = rz;
+ tc = -ry;
+ ma = arx;
+ }
+ }
+ else if (ary > arx && ary > arz) {
+ if (ry >= 0.0F) {
+ imgArray = (const struct gl_texture_image **) texObj->Image[FACE_POS_Y];
+ sc = rx;
+ tc = rz;
+ ma = ary;
+ }
+ else {
+ imgArray = (const struct gl_texture_image **) texObj->Image[FACE_NEG_Y];
+ sc = rx;
+ tc = -rz;
+ ma = ary;
+ }
+ }
+ else {
+ if (rz > 0.0F) {
+ imgArray = (const struct gl_texture_image **) texObj->Image[FACE_POS_Z];
+ sc = rx;
+ tc = -ry;
+ ma = arz;
+ }
+ else {
+ imgArray = (const struct gl_texture_image **) texObj->Image[FACE_NEG_Z];
+ sc = -rx;
+ tc = -ry;
+ ma = arz;
+ }
+ }
+
+ newCoord[0] = ( sc / ma + 1.0F ) * 0.5F;
+ newCoord[1] = ( tc / ma + 1.0F ) * 0.5F;
+ return imgArray;
+}
+
+
+static void
+sample_nearest_cube(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4])
+{
+ GLuint i;
+ (void) texUnit;
+ (void) lambda;
+ for (i = 0; i < n; i++) {
+ const struct gl_texture_image **images;
+ GLfloat newCoord[4];
+ images = choose_cube_face(tObj, texcoords[i], newCoord);
+ sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel],
+ newCoord, rgba[i]);
+ }
+}
+
+
+static void
+sample_linear_cube(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ (void) texUnit;
+ (void) lambda;
+ for (i = 0; i < n; i++) {
+ const struct gl_texture_image **images;
+ GLfloat newCoord[4];
+ images = choose_cube_face(tObj, texcoords[i], newCoord);
+ sample_2d_linear(ctx, tObj, images[tObj->BaseLevel],
+ newCoord, rgba[i]);
+ }
+}
+
+
+static void
+sample_cube_nearest_mipmap_nearest(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ (void) texUnit;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ const struct gl_texture_image **images;
+ GLfloat newCoord[4];
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ images = choose_cube_face(tObj, texcoord[i], newCoord);
+ sample_2d_nearest(ctx, tObj, images[level], newCoord, rgba[i]);
+ }
+}
+
+
+static void
+sample_cube_linear_mipmap_nearest(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ (void) texUnit;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ const struct gl_texture_image **images;
+ GLfloat newCoord[4];
+ GLint level;
+ COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda[i], level);
+ images = choose_cube_face(tObj, texcoord[i], newCoord);
+ sample_2d_linear(ctx, tObj, images[level], newCoord, rgba[i]);
+ }
+}
+
+
+static void
+sample_cube_nearest_mipmap_linear(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ (void) texUnit;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ const struct gl_texture_image **images;
+ GLfloat newCoord[4];
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ images = choose_cube_face(tObj, texcoord[i], newCoord);
+ if (level >= tObj->_MaxLevel) {
+ sample_2d_nearest(ctx, tObj, images[tObj->_MaxLevel],
+ newCoord, rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4]; /* texels */
+ const GLfloat f = FRAC(lambda[i]);
+ sample_2d_nearest(ctx, tObj, images[level ], newCoord, t0);
+ sample_2d_nearest(ctx, tObj, images[level+1], newCoord, t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+static void
+sample_cube_linear_mipmap_linear(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoord[][4],
+ const GLfloat lambda[], GLchan rgba[][4])
+{
+ GLuint i;
+ (void) texUnit;
+ ASSERT(lambda != NULL);
+ for (i = 0; i < n; i++) {
+ const struct gl_texture_image **images;
+ GLfloat newCoord[4];
+ GLint level;
+ COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
+ images = choose_cube_face(tObj, texcoord[i], newCoord);
+ if (level >= tObj->_MaxLevel) {
+ sample_2d_linear(ctx, tObj, images[tObj->_MaxLevel],
+ newCoord, rgba[i]);
+ }
+ else {
+ GLchan t0[4], t1[4];
+ const GLfloat f = FRAC(lambda[i]);
+ sample_2d_linear(ctx, tObj, images[level ], newCoord, t0);
+ sample_2d_linear(ctx, tObj, images[level+1], newCoord, t1);
+ rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
+ rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
+ rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
+ rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ }
+ }
+}
+
+
+static void
+sample_lambda_cube( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4])
+{
+ GLuint minStart, minEnd; /* texels with minification */
+ GLuint magStart, magEnd; /* texels with magnification */
+
+ ASSERT(lambda != NULL);
+ compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
+ n, lambda, &minStart, &minEnd, &magStart, &magEnd);
+
+ if (minStart < minEnd) {
+ /* do the minified texels */
+ const GLuint m = minEnd - minStart;
+ switch (tObj->MinFilter) {
+ case GL_NEAREST:
+ sample_nearest_cube(ctx, texUnit, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR:
+ sample_linear_cube(ctx, texUnit, tObj, m, texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_NEAREST_MIPMAP_NEAREST:
+ sample_cube_nearest_mipmap_nearest(ctx, texUnit, tObj, m,
+ texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_NEAREST:
+ sample_cube_linear_mipmap_nearest(ctx, texUnit, tObj, m,
+ texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_NEAREST_MIPMAP_LINEAR:
+ sample_cube_nearest_mipmap_linear(ctx, texUnit, tObj, m,
+ texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ case GL_LINEAR_MIPMAP_LINEAR:
+ sample_cube_linear_mipmap_linear(ctx, texUnit, tObj, m,
+ texcoords + minStart,
+ lambda + minStart, rgba + minStart);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad min filter in sample_lambda_cube");
+ }
+ }
+
+ if (magStart < magEnd) {
+ /* do the magnified texels */
+ const GLuint m = magEnd - magStart;
+ switch (tObj->MagFilter) {
+ case GL_NEAREST:
+ sample_nearest_cube(ctx, texUnit, tObj, m, texcoords + magStart,
+ lambda + magStart, rgba + magStart);
+ break;
+ case GL_LINEAR:
+ sample_linear_cube(ctx, texUnit, tObj, m, texcoords + magStart,
+ lambda + magStart, rgba + magStart);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad mag filter in sample_lambda_cube");
+ }
+ }
+}
+
+
+/**********************************************************************/
+/* Texture Rectangle Sampling Functions */
+/**********************************************************************/
+
+static void
+sample_nearest_rect(GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan 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;
+ GLuint i;
+
+ (void) ctx;
+ (void) texUnit;
+ (void) lambda;
+
+ ASSERT(tObj->WrapS == GL_CLAMP ||
+ tObj->WrapS == GL_CLAMP_TO_EDGE ||
+ tObj->WrapS == GL_CLAMP_TO_BORDER);
+ ASSERT(tObj->WrapT == GL_CLAMP ||
+ tObj->WrapT == GL_CLAMP_TO_EDGE ||
+ tObj->WrapT == GL_CLAMP_TO_BORDER);
+ ASSERT(img->Format != GL_COLOR_INDEX);
+
+ /* XXX move Wrap mode tests outside of loops for common cases */
+ for (i = 0; i < n; i++) {
+ GLint row, col;
+ /* NOTE: we DO NOT use [0, 1] texture coordinates! */
+ if (tObj->WrapS == GL_CLAMP) {
+ col = IFLOOR( CLAMP(texcoords[i][0], 0.0F, width - 1) );
+ }
+ else if (tObj->WrapS == GL_CLAMP_TO_EDGE) {
+ col = IFLOOR( CLAMP(texcoords[i][0], 0.5F, width - 0.5F) );
+ }
+ else {
+ col = IFLOOR( CLAMP(texcoords[i][0], -0.5F, width + 0.5F) );
+ }
+ if (tObj->WrapT == GL_CLAMP) {
+ row = IFLOOR( CLAMP(texcoords[i][1], 0.0F, height - 1) );
+ }
+ else if (tObj->WrapT == GL_CLAMP_TO_EDGE) {
+ row = IFLOOR( CLAMP(texcoords[i][1], 0.5F, height - 0.5F) );
+ }
+ else {
+ row = IFLOOR( CLAMP(texcoords[i][1], -0.5F, height + 0.5F) );
+ }
+
+ if (col < 0 || col > width_minus_1 || row < 0 || row > height_minus_1)
+ COPY_CHAN4(rgba[i], tObj->_BorderChan);
+ else
+ img->FetchTexelc(img, col, row, 0, rgba[i]);
+ }
+}
+
+
+static void
+sample_linear_rect(GLcontext *ctx, GLuint texUnit,
+ 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][0];
+ const GLfloat width = (GLfloat) img->Width;
+ const GLfloat height = (GLfloat) img->Height;
+ const GLint width_minus_1 = img->Width - 1;
+ const GLint height_minus_1 = img->Height - 1;
+ GLuint i;
+
+ (void) ctx;
+ (void) texUnit;
+ (void) lambda;
+
+ ASSERT(tObj->WrapS == GL_CLAMP ||
+ tObj->WrapS == GL_CLAMP_TO_EDGE ||
+ tObj->WrapS == GL_CLAMP_TO_BORDER);
+ ASSERT(tObj->WrapT == GL_CLAMP ||
+ tObj->WrapT == GL_CLAMP_TO_EDGE ||
+ tObj->WrapT == GL_CLAMP_TO_BORDER);
+ ASSERT(img->Format != GL_COLOR_INDEX);
+
+ /* XXX lots of opportunity for optimization in this loop */
+ for (i = 0; i < n; i++) {
+ GLfloat frow, fcol;
+ GLint i0, j0, i1, j1;
+ GLchan t00[4], t01[4], t10[4], t11[4];
+ GLfloat a, b;
+ GLuint useBorderColor = 0;
+#if CHAN_TYPE == GL_UNSIGNED_BYTE
+ GLint ia, ib;
+#endif
+
+ /* 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;
+ }
+
+ /* 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;
+
+ /* get four texel samples */
+ if (useBorderColor & (I0BIT | J0BIT))
+ COPY_CHAN4(t00, tObj->_BorderChan);
+ else
+ img->FetchTexelc(img, i0, j0, 0, t00);
+
+ if (useBorderColor & (I1BIT | J0BIT))
+ COPY_CHAN4(t10, tObj->_BorderChan);
+ else
+ img->FetchTexelc(img, i1, j0, 0, t10);
+
+ if (useBorderColor & (I0BIT | J1BIT))
+ COPY_CHAN4(t01, tObj->_BorderChan);
+ else
+ img->FetchTexelc(img, i0, j1, 0, t01);
+
+ if (useBorderColor & (I1BIT | J1BIT))
+ COPY_CHAN4(t11, tObj->_BorderChan);
+ else
+ img->FetchTexelc(img, i1, j1, 0, t11);
+
+ /* compute interpolants */
+ a = FRAC(fcol);
+ b = FRAC(frow);
+#if CHAN_TYPE == GL_UNSIGNED_BYTE
+ ia = IROUND_POS(a * ILERP_SCALE);
+ ib = IROUND_POS(b * ILERP_SCALE);
+#endif
+
+ /* do bilinear interpolation of texel colors */
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
+ rgba[i][1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
+ rgba[i][2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
+ rgba[i][3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ rgba[i][0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
+ rgba[i][1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
+ rgba[i][2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
+ rgba[i][3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
+#else
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ rgba[i][0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
+ rgba[i][1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
+ rgba[i][2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
+ rgba[i][3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
+#endif
+ }
+}
+
+
+static void
+sample_lambda_rect( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4])
+{
+ GLuint minStart, minEnd, magStart, magEnd;
+
+ /* We only need lambda to decide between minification and magnification.
+ * There is no mipmapping with rectangular textures.
+ */
+ compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
+ n, lambda, &minStart, &minEnd, &magStart, &magEnd);
+
+ if (minStart < minEnd) {
+ if (tObj->MinFilter == GL_NEAREST) {
+ sample_nearest_rect( ctx, texUnit, tObj, minEnd - minStart,
+ texcoords + minStart, NULL, rgba + minStart);
+ }
+ else {
+ sample_linear_rect( ctx, texUnit, tObj, minEnd - minStart,
+ texcoords + minStart, NULL, rgba + minStart);
+ }
+ }
+ if (magStart < magEnd) {
+ if (tObj->MagFilter == GL_NEAREST) {
+ sample_nearest_rect( ctx, texUnit, tObj, magEnd - magStart,
+ texcoords + magStart, NULL, rgba + magStart);
+ }
+ else {
+ sample_linear_rect( ctx, texUnit, tObj, magEnd - magStart,
+ texcoords + magStart, NULL, rgba + magStart);
+ }
+ }
+}
+
+
+
+/*
+ * Sample a shadow/depth texture.
+ */
+static void
+sample_depth_texture( GLcontext *ctx, GLuint unit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan texel[][4] )
+{
+ const GLint baseLevel = tObj->BaseLevel;
+ const struct gl_texture_image *texImage = tObj->Image[0][baseLevel];
+ const GLuint width = texImage->Width;
+ const GLuint height = texImage->Height;
+ GLchan ambient;
+ GLenum function;
+ GLchan result;
+
+ (void) lambda;
+ (void) unit;
+
+ ASSERT(tObj->Image[0][tObj->BaseLevel]->Format == GL_DEPTH_COMPONENT);
+ ASSERT(tObj->Target == GL_TEXTURE_1D ||
+ tObj->Target == GL_TEXTURE_2D ||
+ tObj->Target == GL_TEXTURE_RECTANGLE_NV);
+
+ UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
+
+ /* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */
+
+ /* XXX this could be precomputed and saved in the texture object */
+ if (tObj->CompareFlag) {
+ /* GL_SGIX_shadow */
+ if (tObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
+ function = GL_LEQUAL;
+ }
+ else {
+ ASSERT(tObj->CompareOperator == GL_TEXTURE_GEQUAL_R_SGIX);
+ function = GL_GEQUAL;
+ }
+ }
+ else if (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
+ /* GL_ARB_shadow */
+ function = tObj->CompareFunc;
+ }
+ else {
+ function = GL_NONE; /* pass depth through as grayscale */
+ }
+
+ if (tObj->MagFilter == GL_NEAREST) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ GLfloat depthSample;
+ GLint col, row;
+ /* XXX fix for texture rectangle! */
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0], width, col);
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1], height, row);
+ texImage->FetchTexelf(texImage, col, row, 0, &depthSample);
+
+ switch (function) {
+ case GL_LEQUAL:
+ result = (texcoords[i][2] <= depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_GEQUAL:
+ result = (texcoords[i][2] >= depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_LESS:
+ result = (texcoords[i][2] < depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_GREATER:
+ result = (texcoords[i][2] > depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_EQUAL:
+ result = (texcoords[i][2] == depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_NOTEQUAL:
+ result = (texcoords[i][2] != depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_ALWAYS:
+ result = CHAN_MAX;
+ break;
+ case GL_NEVER:
+ result = ambient;
+ break;
+ case GL_NONE:
+ CLAMPED_FLOAT_TO_CHAN(result, depthSample);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad compare func in sample_depth_texture");
+ return;
+ }
+
+ switch (tObj->DepthMode) {
+ case GL_LUMINANCE:
+ texel[i][RCOMP] = result;
+ texel[i][GCOMP] = result;
+ texel[i][BCOMP] = result;
+ texel[i][ACOMP] = CHAN_MAX;
+ break;
+ case GL_INTENSITY:
+ texel[i][RCOMP] = result;
+ texel[i][GCOMP] = result;
+ texel[i][BCOMP] = result;
+ texel[i][ACOMP] = result;
+ break;
+ case GL_ALPHA:
+ texel[i][RCOMP] = 0;
+ texel[i][GCOMP] = 0;
+ texel[i][BCOMP] = 0;
+ texel[i][ACOMP] = result;
+ break;
+ default:
+ _mesa_problem(ctx, "Bad depth texture mode");
+ }
+ }
+ }
+ else {
+ GLuint i;
+ ASSERT(tObj->MagFilter == GL_LINEAR);
+ for (i = 0; i < n; i++) {
+ GLfloat depth00, depth01, depth10, depth11;
+ GLint i0, i1, j0, j1;
+ GLfloat u, v;
+ GLuint useBorderTexel;
+
+ /* XXX fix for texture rectangle! */
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoords[i][0], u, width, i0, i1);
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoords[i][1], v, height,j0, j1);
+
+ useBorderTexel = 0;
+ if (texImage->Border) {
+ i0 += texImage->Border;
+ i1 += texImage->Border;
+ j0 += texImage->Border;
+ j1 += texImage->Border;
+ }
+ else {
+ if (i0 < 0 || i0 >= (GLint) width) useBorderTexel |= I0BIT;
+ if (i1 < 0 || i1 >= (GLint) width) useBorderTexel |= I1BIT;
+ if (j0 < 0 || j0 >= (GLint) height) useBorderTexel |= J0BIT;
+ if (j1 < 0 || j1 >= (GLint) height) useBorderTexel |= J1BIT;
+ }
+
+ /* get four depth samples from the texture */
+ if (useBorderTexel & (I0BIT | J0BIT)) {
+ depth00 = 1.0;
+ }
+ else {
+ texImage->FetchTexelf(texImage, i0, j0, 0, &depth00);
+ }
+ if (useBorderTexel & (I1BIT | J0BIT)) {
+ depth10 = 1.0;
+ }
+ else {
+ texImage->FetchTexelf(texImage, i1, j0, 0, &depth10);
+ }
+ if (useBorderTexel & (I0BIT | J1BIT)) {
+ depth01 = 1.0;
+ }
+ else {
+ texImage->FetchTexelf(texImage, i0, j1, 0, &depth01);
+ }
+ if (useBorderTexel & (I1BIT | J1BIT)) {
+ depth11 = 1.0;
+ }
+ else {
+ texImage->FetchTexelf(texImage, i1, j1, 0, &depth11);
+ }
+
+ 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][2] && function == GL_LEQUAL) ||
+ (depthSample >= texcoords[i][2] && function == GL_GEQUAL)) {
+ result = ambient;
+ }
+ else {
+ result = CHAN_MAX;
+ }
+ }
+ else {
+ /* Do four depth/R comparisons and compute a weighted result.
+ * If this touches on somebody's I.P., I'll remove this code
+ * upon request.
+ */
+ const GLfloat d = (CHAN_MAXF - (GLfloat) ambient) * 0.25F;
+ GLfloat luminance = CHAN_MAXF;
+
+ switch (function) {
+ case GL_LEQUAL:
+ if (depth00 <= texcoords[i][2]) luminance -= d;
+ if (depth01 <= texcoords[i][2]) luminance -= d;
+ if (depth10 <= texcoords[i][2]) luminance -= d;
+ if (depth11 <= texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_GEQUAL:
+ if (depth00 >= texcoords[i][2]) luminance -= d;
+ if (depth01 >= texcoords[i][2]) luminance -= d;
+ if (depth10 >= texcoords[i][2]) luminance -= d;
+ if (depth11 >= texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_LESS:
+ if (depth00 < texcoords[i][2]) luminance -= d;
+ if (depth01 < texcoords[i][2]) luminance -= d;
+ if (depth10 < texcoords[i][2]) luminance -= d;
+ if (depth11 < texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_GREATER:
+ if (depth00 > texcoords[i][2]) luminance -= d;
+ if (depth01 > texcoords[i][2]) luminance -= d;
+ if (depth10 > texcoords[i][2]) luminance -= d;
+ if (depth11 > texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_EQUAL:
+ if (depth00 == texcoords[i][2]) luminance -= d;
+ if (depth01 == texcoords[i][2]) luminance -= d;
+ if (depth10 == texcoords[i][2]) luminance -= d;
+ if (depth11 == texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_NOTEQUAL:
+ if (depth00 != texcoords[i][2]) luminance -= d;
+ if (depth01 != texcoords[i][2]) luminance -= d;
+ if (depth10 != texcoords[i][2]) luminance -= d;
+ if (depth11 != texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_ALWAYS:
+ result = 0;
+ break;
+ case GL_NEVER:
+ result = CHAN_MAX;
+ break;
+ case GL_NONE:
+ /* ordinary bilinear filtering */
+ {
+ const GLfloat a = FRAC(u + 1.0F);
+ const GLfloat b = FRAC(v + 1.0F);
+ const GLfloat 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;
+ }
+ }
+
+ switch (tObj->DepthMode) {
+ case GL_LUMINANCE:
+ texel[i][RCOMP] = result;
+ texel[i][GCOMP] = result;
+ texel[i][BCOMP] = result;
+ texel[i][ACOMP] = CHAN_MAX;
+ break;
+ case GL_INTENSITY:
+ texel[i][RCOMP] = result;
+ texel[i][GCOMP] = result;
+ texel[i][BCOMP] = result;
+ texel[i][ACOMP] = result;
+ break;
+ case GL_ALPHA:
+ texel[i][RCOMP] = 0;
+ texel[i][GCOMP] = 0;
+ texel[i][BCOMP] = 0;
+ texel[i][ACOMP] = result;
+ break;
+ default:
+ _mesa_problem(ctx, "Bad depth texture mode");
+ }
+ } /* for */
+ } /* if filter */
+}
+
+
+#if 0
+/*
+ * Experimental depth texture sampling function.
+ */
+static void
+sample_depth_texture2(const GLcontext *ctx,
+ const struct gl_texture_unit *texUnit,
+ GLuint n, 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->Format != GL_DEPTH_COMPONENT) {
+ _mesa_problem(ctx,"GL_TEXTURE_COMPARE_SGIX enabled with non-depth texture");
+ return;
+ }
+
+ UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
+
+ if (texObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
+ lequal = GL_TRUE;
+ gequal = GL_FALSE;
+ }
+ else {
+ lequal = GL_FALSE;
+ gequal = GL_TRUE;
+ }
+
+ {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ const GLint K = 3;
+ GLint col, row, ii, jj, imin, imax, jmin, jmax, samples, count;
+ GLfloat w;
+ GLchan lum;
+ COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapS, texcoords[i][0],
+ width, col);
+ COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapT, texcoords[i][1],
+ height, row);
+
+ imin = col - K;
+ imax = col + K;
+ jmin = row - K;
+ jmax = row + K;
+
+ if (imin < 0) imin = 0;
+ if (imax >= width) imax = width - 1;
+ if (jmin < 0) jmin = 0;
+ if (jmax >= height) jmax = height - 1;
+
+ samples = (imax - imin + 1) * (jmax - jmin + 1);
+ count = 0;
+ for (jj = jmin; jj <= jmax; jj++) {
+ for (ii = imin; ii <= imax; ii++) {
+ GLfloat depthSample;
+ 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
+ * return black (see issue 23 in GL_ARB_fragment_program spec).
+ * Note: fragment programss don't observe the texture enable/disable flags.
+ */
+static void
+null_sample_func( GLcontext *ctx, GLuint texUnit,
+ const struct gl_texture_object *tObj, GLuint n,
+ const GLfloat texcoords[][4], const GLfloat lambda[],
+ GLchan rgba[][4])
+{
+ GLuint i;
+ (void) ctx;
+ (void) texUnit;
+ (void) tObj;
+ (void) texcoords;
+ (void) lambda;
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = 0;
+ rgba[i][GCOMP] = 0;
+ rgba[i][BCOMP] = 0;
+ rgba[i][ACOMP] = CHAN_MAX;
+ }
+}
+
+
+/**
+ * Setup the texture sampling function for this texture object.
+ */
+texture_sample_func
+_swrast_choose_texture_sample_func( GLcontext *ctx,
+ const struct gl_texture_object *t )
+{
+ if (!t || !t->Complete) {
+ return &null_sample_func;
+ }
+ else {
+ const GLboolean needLambda = (GLboolean) (t->MinFilter != t->MagFilter);
+ const GLenum format = t->Image[0][t->BaseLevel]->Format;
+
+ switch (t->Target) {
+ case GL_TEXTURE_1D:
+ if (format == GL_DEPTH_COMPONENT) {
+ return &sample_depth_texture;
+ }
+ else if (needLambda) {
+ return &sample_lambda_1d;
+ }
+ else if (t->MinFilter == GL_LINEAR) {
+ return &sample_linear_1d;
+ }
+ else {
+ ASSERT(t->MinFilter == GL_NEAREST);
+ return &sample_nearest_1d;
+ }
+ case GL_TEXTURE_2D:
+ if (format == GL_DEPTH_COMPONENT) {
+ return &sample_depth_texture;
+ }
+ else if (needLambda) {
+ return &sample_lambda_2d;
+ }
+ else if (t->MinFilter == GL_LINEAR) {
+ return &sample_linear_2d;
+ }
+ else {
+ GLint baseLevel = t->BaseLevel;
+ ASSERT(t->MinFilter == GL_NEAREST);
+ if (t->WrapS == GL_REPEAT &&
+ t->WrapT == GL_REPEAT &&
+ t->_IsPowerOfTwo &&
+ t->Image[0][baseLevel]->Border == 0 &&
+ t->Image[0][baseLevel]->TexFormat->MesaFormat == MESA_FORMAT_RGB) {
+ return &opt_sample_rgb_2d;
+ }
+ else if (t->WrapS == GL_REPEAT &&
+ t->WrapT == GL_REPEAT &&
+ t->_IsPowerOfTwo &&
+ t->Image[0][baseLevel]->Border == 0 &&
+ t->Image[0][baseLevel]->TexFormat->MesaFormat == MESA_FORMAT_RGBA) {
+ return &opt_sample_rgba_2d;
+ }
+ else {
+ return &sample_nearest_2d;
+ }
+ }
+ case GL_TEXTURE_3D:
+ if (needLambda) {
+ return &sample_lambda_3d;
+ }
+ else if (t->MinFilter == GL_LINEAR) {
+ return &sample_linear_3d;
+ }
+ else {
+ ASSERT(t->MinFilter == GL_NEAREST);
+ return &sample_nearest_3d;
+ }
+ case GL_TEXTURE_CUBE_MAP:
+ if (needLambda) {
+ return &sample_lambda_cube;
+ }
+ else if (t->MinFilter == GL_LINEAR) {
+ return &sample_linear_cube;
+ }
+ else {
+ ASSERT(t->MinFilter == GL_NEAREST);
+ return &sample_nearest_cube;
+ }
+ case GL_TEXTURE_RECTANGLE_NV:
+ if (needLambda) {
+ return &sample_lambda_rect;
+ }
+ else if (t->MinFilter == GL_LINEAR) {
+ return &sample_linear_rect;
+ }
+ else {
+ ASSERT(t->MinFilter == GL_NEAREST);
+ return &sample_nearest_rect;
+ }
+ default:
+ _mesa_problem(ctx,
+ "invalid target in _swrast_choose_texture_sample_func");
+ return &null_sample_func;
+ }
+ }
+}
+
+
+#define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) )
+#define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) )
+
+
+/**
+ * Do texture application for GL_ARB/EXT_texture_env_combine.
+ * This function also supports GL_{EXT,ARB}_texture_env_dot3 and
+ * GL_ATI_texture_env_combine3. Since "classic" texture environments are
+ * implemented using GL_ARB_texture_env_combine-like state, this same function
+ * is used for classic texture environment application as well.
+ *
+ * \param ctx rendering context
+ * \param textureUnit the texture unit to apply
+ * \param n number of fragments to process (span width)
+ * \param primary_rgba incoming fragment color array
+ * \param texelBuffer pointer to texel colors for all texture units
+ *
+ * \param rgba incoming colors, which get modified here
+ */
+static INLINE void
+texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
+ CONST GLchan (*primary_rgba)[4],
+ CONST GLchan *texelBuffer,
+ GLchan (*rgba)[4] )
+{
+ const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]);
+ const GLchan (*argRGB [3])[4];
+ const GLchan (*argA [3])[4];
+ const GLuint RGBshift = textureUnit->_CurrentCombine->ScaleShiftRGB;
+ const GLuint Ashift = textureUnit->_CurrentCombine->ScaleShiftA;
+#if CHAN_TYPE == GL_FLOAT
+ const GLchan RGBmult = (GLfloat) (1 << RGBshift);
+ const GLchan Amult = (GLfloat) (1 << Ashift);
+ static const GLchan one[4] = { 1.0, 1.0, 1.0, 1.0 };
+ static const GLchan zero[4] = { 0.0, 0.0, 0.0, 0.0 };
+#else
+ const GLint half = (CHAN_MAX + 1) / 2;
+ static const GLchan one[4] = { CHAN_MAX, CHAN_MAX, CHAN_MAX, CHAN_MAX };
+ static const GLchan zero[4] = { 0, 0, 0, 0 };
+#endif
+ GLuint i, j;
+ GLuint numColorArgs;
+ GLuint numAlphaArgs;
+
+ /* GLchan ccolor[3][4]; */
+ DEFMNARRAY(GLchan, ccolor, 3, 3 * MAX_WIDTH, 4); /* mac 32k limitation */
+ CHECKARRAY(ccolor, return); /* mac 32k limitation */
+
+ ASSERT(ctx->Extensions.EXT_texture_env_combine ||
+ ctx->Extensions.ARB_texture_env_combine);
+ ASSERT(SWRAST_CONTEXT(ctx)->_AnyTextureCombine);
+
+
+ /*
+ printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n",
+ textureUnit->_CurrentCombine->ModeRGB,
+ textureUnit->_CurrentCombine->ModeA,
+ textureUnit->_CurrentCombine->SourceRGB[0],
+ textureUnit->_CurrentCombine->SourceA[0],
+ textureUnit->_CurrentCombine->SourceRGB[1],
+ textureUnit->_CurrentCombine->SourceA[1]);
+ */
+
+ /*
+ * Do operand setup for up to 3 operands. Loop over the terms.
+ */
+ numColorArgs = textureUnit->_CurrentCombine->_NumArgsRGB;
+ numAlphaArgs = textureUnit->_CurrentCombine->_NumArgsA;
+
+ for (j = 0; j < numColorArgs; j++) {
+ const GLenum srcRGB = textureUnit->_CurrentCombine->SourceRGB[j];
+
+
+ switch (srcRGB) {
+ case GL_TEXTURE:
+ argRGB[j] = (const GLchan (*)[4])
+ (texelBuffer + unit * (n * 4 * sizeof(GLchan)));
+ break;
+ case GL_PRIMARY_COLOR:
+ argRGB[j] = primary_rgba;
+ break;
+ case GL_PREVIOUS:
+ argRGB[j] = (const GLchan (*)[4]) rgba;
+ break;
+ case GL_CONSTANT:
+ {
+ GLchan (*c)[4] = ccolor[j];
+ GLchan red, green, blue, alpha;
+ UNCLAMPED_FLOAT_TO_CHAN(red, textureUnit->EnvColor[0]);
+ UNCLAMPED_FLOAT_TO_CHAN(green, textureUnit->EnvColor[1]);
+ UNCLAMPED_FLOAT_TO_CHAN(blue, textureUnit->EnvColor[2]);
+ UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]);
+ for (i = 0; i < n; i++) {
+ c[i][RCOMP] = red;
+ c[i][GCOMP] = green;
+ c[i][BCOMP] = blue;
+ c[i][ACOMP] = alpha;
+ }
+ argRGB[j] = (const GLchan (*)[4]) ccolor[j];
+ }
+ break;
+ /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
+ */
+ case GL_ZERO:
+ argRGB[j] = & zero;
+ break;
+ case GL_ONE:
+ argRGB[j] = & one;
+ break;
+ default:
+ /* ARB_texture_env_crossbar source */
+ {
+ const GLuint srcUnit = srcRGB - GL_TEXTURE0;
+ ASSERT(srcUnit < ctx->Const.MaxTextureUnits);
+ if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)
+ return;
+ argRGB[j] = (const GLchan (*)[4])
+ (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan)));
+ }
+ }
+
+ if (textureUnit->_CurrentCombine->OperandRGB[j] != GL_SRC_COLOR) {
+ const GLchan (*src)[4] = argRGB[j];
+ GLchan (*dst)[4] = ccolor[j];
+
+ /* point to new arg[j] storage */
+ argRGB[j] = (const GLchan (*)[4]) ccolor[j];
+
+ if (textureUnit->_CurrentCombine->OperandRGB[j] == GL_ONE_MINUS_SRC_COLOR) {
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = CHAN_MAX - src[i][RCOMP];
+ dst[i][GCOMP] = CHAN_MAX - src[i][GCOMP];
+ dst[i][BCOMP] = CHAN_MAX - src[i][BCOMP];
+ }
+ }
+ else if (textureUnit->_CurrentCombine->OperandRGB[j] == GL_SRC_ALPHA) {
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = src[i][ACOMP];
+ dst[i][GCOMP] = src[i][ACOMP];
+ dst[i][BCOMP] = src[i][ACOMP];
+ }
+ }
+ else {
+ ASSERT(textureUnit->_CurrentCombine->OperandRGB[j] ==GL_ONE_MINUS_SRC_ALPHA);
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = CHAN_MAX - src[i][ACOMP];
+ dst[i][GCOMP] = CHAN_MAX - src[i][ACOMP];
+ dst[i][BCOMP] = CHAN_MAX - src[i][ACOMP];
+ }
+ }
+ }
+ }
+
+
+ for (j = 0; j < numAlphaArgs; j++) {
+ const GLenum srcA = textureUnit->_CurrentCombine->SourceA[j];
+
+ switch (srcA) {
+ case GL_TEXTURE:
+ argA[j] = (const GLchan (*)[4])
+ (texelBuffer + unit * (n * 4 * sizeof(GLchan)));
+ break;
+ case GL_PRIMARY_COLOR:
+ argA[j] = primary_rgba;
+ break;
+ case GL_PREVIOUS:
+ argA[j] = (const GLchan (*)[4]) rgba;
+ break;
+ case GL_CONSTANT:
+ {
+ GLchan alpha, (*c)[4] = ccolor[j];
+ UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]);
+ for (i = 0; i < n; i++)
+ c[i][ACOMP] = alpha;
+ argA[j] = (const GLchan (*)[4]) ccolor[j];
+ }
+ break;
+ /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
+ */
+ case GL_ZERO:
+ argA[j] = & zero;
+ break;
+ case GL_ONE:
+ argA[j] = & one;
+ break;
+ default:
+ /* ARB_texture_env_crossbar source */
+ {
+ const GLuint srcUnit = srcA - GL_TEXTURE0;
+ ASSERT(srcUnit < ctx->Const.MaxTextureUnits);
+ if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)
+ return;
+ argA[j] = (const GLchan (*)[4])
+ (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan)));
+ }
+ }
+
+ if (textureUnit->_CurrentCombine->OperandA[j] == GL_ONE_MINUS_SRC_ALPHA) {
+ const GLchan (*src)[4] = argA[j];
+ GLchan (*dst)[4] = ccolor[j];
+ argA[j] = (const GLchan (*)[4]) ccolor[j];
+ for (i = 0; i < n; i++) {
+ dst[i][ACOMP] = CHAN_MAX - src[i][ACOMP];
+ }
+ }
+ }
+
+ /*
+ * Do the texture combine.
+ */
+ switch (textureUnit->_CurrentCombine->ModeRGB) {
+ case GL_REPLACE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ if (RGBshift) {
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = arg0[i][RCOMP] * RGBmult;
+ rgba[i][GCOMP] = arg0[i][GCOMP] * RGBmult;
+ rgba[i][BCOMP] = arg0[i][BCOMP] * RGBmult;
+#else
+ GLuint r = (GLuint) arg0[i][RCOMP] << RGBshift;
+ GLuint g = (GLuint) arg0[i][GCOMP] << RGBshift;
+ GLuint b = (GLuint) arg0[i][BCOMP] << RGBshift;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = arg0[i][RCOMP];
+ rgba[i][GCOMP] = arg0[i][GCOMP];
+ rgba[i][BCOMP] = arg0[i][BCOMP];
+ }
+ }
+ }
+ break;
+ case GL_MODULATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * RGBmult;
+ rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * RGBmult;
+ rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * RGBmult;
+#else
+ GLuint r = PROD(arg0[i][RCOMP], arg1[i][RCOMP]) >> shift;
+ GLuint g = PROD(arg0[i][GCOMP], arg1[i][GCOMP]) >> shift;
+ GLuint b = PROD(arg0[i][BCOMP], arg1[i][BCOMP]) >> shift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * RGBmult;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * RGBmult;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * RGBmult;
+#else
+ GLint r = ((GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP]) << RGBshift;
+ GLint g = ((GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP]) << RGBshift;
+ GLint b = ((GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP]) << RGBshift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD_SIGNED:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5) * RGBmult;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5) * RGBmult;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5) * RGBmult;
+#else
+ GLint r = (GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP] -half;
+ GLint g = (GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP] -half;
+ GLint b = (GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP] -half;
+ r = (r < 0) ? 0 : r << RGBshift;
+ g = (g < 0) ? 0 : g << RGBshift;
+ b = (b < 0) ? 0 : b << RGBshift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_INTERPOLATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] +
+ arg1[i][RCOMP] * (CHAN_MAXF - arg2[i][RCOMP])) * RGBmult;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] +
+ arg1[i][GCOMP] * (CHAN_MAXF - arg2[i][GCOMP])) * RGBmult;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] +
+ arg1[i][BCOMP] * (CHAN_MAXF - arg2[i][BCOMP])) * RGBmult;
+#else
+ GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ + PROD(arg1[i][RCOMP], CHAN_MAX - arg2[i][RCOMP]))
+ >> shift;
+ GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ + PROD(arg1[i][GCOMP], CHAN_MAX - arg2[i][GCOMP]))
+ >> shift;
+ GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ + PROD(arg1[i][BCOMP], CHAN_MAX - arg2[i][BCOMP]))
+ >> shift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_SUBTRACT:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * RGBmult;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * RGBmult;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * RGBmult;
+#else
+ GLint r = ((GLint) arg0[i][RCOMP] - (GLint) arg1[i][RCOMP]) << RGBshift;
+ GLint g = ((GLint) arg0[i][GCOMP] - (GLint) arg1[i][GCOMP]) << RGBshift;
+ GLint b = ((GLint) arg0[i][BCOMP] - (GLint) arg1[i][BCOMP]) << RGBshift;
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_DOT3_RGB_EXT:
+ case GL_DOT3_RGBA_EXT:
+ {
+ /* Do not scale the result by 1 2 or 4 */
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) +
+ (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) +
+ (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F))
+ * 4.0F;
+ dot = CLAMP(dot, 0.0F, CHAN_MAXF);
+#else
+ GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half,
+ (GLint)arg1[i][RCOMP] - half) +
+ S_PROD((GLint)arg0[i][GCOMP] - half,
+ (GLint)arg1[i][GCOMP] - half) +
+ S_PROD((GLint)arg0[i][BCOMP] - half,
+ (GLint)arg1[i][BCOMP] - half)) >> 6;
+ dot = CLAMP(dot, 0, CHAN_MAX);
+#endif
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot;
+ }
+ }
+ break;
+ case GL_DOT3_RGB:
+ case GL_DOT3_RGBA:
+ {
+ /* DO scale the result by 1 2 or 4 */
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) +
+ (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) +
+ (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F))
+ * 4.0F * RGBmult;
+ dot = CLAMP(dot, 0.0, CHAN_MAXF);
+#else
+ GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half,
+ (GLint)arg1[i][RCOMP] - half) +
+ S_PROD((GLint)arg0[i][GCOMP] - half,
+ (GLint)arg1[i][GCOMP] - half) +
+ S_PROD((GLint)arg0[i][BCOMP] - half,
+ (GLint)arg1[i][BCOMP] - half)) >> 6;
+ dot <<= RGBshift;
+ dot = CLAMP(dot, 0, CHAN_MAX);
+#endif
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot;
+ }
+ }
+ break;
+ case GL_MODULATE_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + arg1[i][RCOMP]) * RGBmult;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + arg1[i][GCOMP]) * RGBmult;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + arg1[i][BCOMP]) * RGBmult;
+#else
+ GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ + ((GLuint) arg1[i][RCOMP] << CHAN_BITS)) >> shift;
+ GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ + ((GLuint) arg1[i][GCOMP] << CHAN_BITS)) >> shift;
+ GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ + ((GLuint) arg1[i][BCOMP] << CHAN_BITS)) >> shift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SIGNED_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + arg1[i][RCOMP] - 0.5) * RGBmult;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + arg1[i][GCOMP] - 0.5) * RGBmult;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + arg1[i][BCOMP] - 0.5) * RGBmult;
+#else
+ GLint r = (S_PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ + (((GLint) arg1[i][RCOMP] - half) << CHAN_BITS))
+ >> shift;
+ GLint g = (S_PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ + (((GLint) arg1[i][GCOMP] - half) << CHAN_BITS))
+ >> shift;
+ GLint b = (S_PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ + (((GLint) arg1[i][BCOMP] - half) << CHAN_BITS))
+ >> shift;
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SUBTRACT_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) - arg1[i][RCOMP]) * RGBmult;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) - arg1[i][GCOMP]) * RGBmult;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) - arg1[i][BCOMP]) * RGBmult;
+#else
+ GLint r = (S_PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ - ((GLint) arg1[i][RCOMP] << CHAN_BITS))
+ >> shift;
+ GLint g = (S_PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ - ((GLint) arg1[i][GCOMP] << CHAN_BITS))
+ >> shift;
+ GLint b = (S_PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ - ((GLint) arg1[i][BCOMP] << CHAN_BITS))
+ >> shift;
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "invalid combine mode");
+ }
+
+ switch (textureUnit->_CurrentCombine->ModeA) {
+ case GL_REPLACE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ if (Ashift) {
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ GLchan a = arg0[i][ACOMP] * Amult;
+#else
+ GLuint a = (GLuint) arg0[i][ACOMP] << Ashift;
+#endif
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = arg0[i][ACOMP];
+ }
+ }
+ }
+ break;
+ case GL_MODULATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * Amult;
+#else
+ GLuint a = (PROD(arg0[i][ACOMP], arg1[i][ACOMP]) >> shift);
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = ((GLint) arg0[i][ACOMP] + arg1[i][ACOMP]) << Ashift;
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD_SIGNED:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * Amult;
+#else
+ GLint a = (GLint) arg0[i][ACOMP] + (GLint) arg1[i][ACOMP] -half;
+ a = (a < 0) ? 0 : a << Ashift;
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_INTERPOLATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i=0; i<n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +
+ arg1[i][ACOMP] * (CHAN_MAXF - arg2[i][ACOMP]))
+ * Amult;
+#else
+ GLuint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ + PROD(arg1[i][ACOMP], CHAN_MAX - arg2[i][ACOMP]))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_SUBTRACT:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = ((GLint) arg0[i][ACOMP] - (GLint) arg1[i][ACOMP]) << Ashift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ + ((GLuint) arg1[i][ACOMP] << CHAN_BITS))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SIGNED_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + arg1[i][ACOMP] - 0.5F) * Amult;
+#else
+ GLint a = (S_PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ + (((GLint) arg1[i][ACOMP] - half) << CHAN_BITS))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SUBTRACT_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) - arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = (S_PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ - ((GLint) arg1[i][ACOMP] << CHAN_BITS))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "invalid combine mode");
+ }
+
+ /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining.
+ * This is kind of a kludge. It would have been better if the spec
+ * were written such that the GL_COMBINE_ALPHA value could be set to
+ * GL_DOT3.
+ */
+ if (textureUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA_EXT ||
+ textureUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA) {
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = rgba[i][RCOMP];
+ }
+ }
+ UNDEFARRAY(ccolor); /* mac 32k limitation */
+}
+#undef PROD
+
+
+/**
+ * Apply a conventional OpenGL texture env mode (REPLACE, ADD, BLEND,
+ * MODULATE, or DECAL) to an array of fragments.
+ * Input: textureUnit - pointer to texture unit to apply
+ * format - base internal texture format
+ * n - number of fragments
+ * primary_rgba - primary colors (may alias rgba for single texture)
+ * texels - array of texel colors
+ * InOut: rgba - incoming fragment colors modified by texel colors
+ * according to the texture environment mode.
+ */
+static void
+texture_apply( const GLcontext *ctx,
+ const struct gl_texture_unit *texUnit,
+ GLuint n,
+ CONST GLchan primary_rgba[][4], CONST GLchan texel[][4],
+ GLchan rgba[][4] )
+{
+ GLint baseLevel;
+ GLuint i;
+ GLint Rc, Gc, Bc, Ac;
+ GLenum format;
+ (void) primary_rgba;
+
+ ASSERT(texUnit);
+ ASSERT(texUnit->_Current);
+
+ baseLevel = texUnit->_Current->BaseLevel;
+ ASSERT(texUnit->_Current->Image[0][baseLevel]);
+
+ format = texUnit->_Current->Image[0][baseLevel]->Format;
+
+ if (format == GL_COLOR_INDEX || format == GL_YCBCR_MESA) {
+ format = GL_RGBA; /* a bit of a hack */
+ }
+ else if (format == GL_DEPTH_COMPONENT) {
+ format = texUnit->_Current->DepthMode;
+ }
+
+ switch (texUnit->EnvMode) {
+ case GL_REPLACE:
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf */
+ /* Av = At */
+ rgba[i][ACOMP] = texel[i][ACOMP];
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ /* Cv = Lt */
+ GLchan Lt = texel[i][RCOMP];
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt;
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ GLchan Lt = texel[i][RCOMP];
+ /* Cv = Lt */
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt;
+ /* Av = At */
+ rgba[i][ACOMP] = texel[i][ACOMP];
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ /* Cv = It */
+ GLchan It = texel[i][RCOMP];
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = It;
+ /* Av = It */
+ rgba[i][ACOMP] = It;
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = Ct */
+ rgba[i][RCOMP] = texel[i][RCOMP];
+ rgba[i][GCOMP] = texel[i][GCOMP];
+ rgba[i][BCOMP] = texel[i][BCOMP];
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = Ct */
+ rgba[i][RCOMP] = texel[i][RCOMP];
+ rgba[i][GCOMP] = texel[i][GCOMP];
+ rgba[i][BCOMP] = texel[i][BCOMP];
+ /* Av = At */
+ rgba[i][ACOMP] = texel[i][ACOMP];
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_REPLACE) in texture_apply");
+ return;
+ }
+ break;
+
+ case GL_MODULATE:
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf */
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ /* Cv = LtCf */
+ GLchan Lt = texel[i][RCOMP];
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt );
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = CfLt */
+ GLchan Lt = texel[i][RCOMP];
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt );
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ /* Cv = CfIt */
+ GLchan It = texel[i][RCOMP];
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], It );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], It );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], It );
+ /* Av = AfIt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], It );
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = CfCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] );
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = CfCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] );
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_MODULATE) in texture_apply");
+ return;
+ }
+ break;
+
+ case GL_DECAL:
+ switch (format) {
+ case GL_ALPHA:
+ case GL_LUMINANCE:
+ case GL_LUMINANCE_ALPHA:
+ case GL_INTENSITY:
+ /* undefined */
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = Ct */
+ rgba[i][RCOMP] = texel[i][RCOMP];
+ rgba[i][GCOMP] = texel[i][GCOMP];
+ rgba[i][BCOMP] = texel[i][BCOMP];
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-At) + CtAt */
+ GLint t = texel[i][ACOMP], s = CHAN_MAX - t;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(texel[i][RCOMP],t);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(texel[i][GCOMP],t);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(texel[i][BCOMP],t);
+ /* Av = Af */
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_DECAL) in texture_apply");
+ return;
+ }
+ break;
+
+ case GL_BLEND:
+ Rc = (GLint) (texUnit->EnvColor[0] * CHAN_MAXF);
+ Gc = (GLint) (texUnit->EnvColor[1] * CHAN_MAXF);
+ Bc = (GLint) (texUnit->EnvColor[2] * CHAN_MAXF);
+ Ac = (GLint) (texUnit->EnvColor[3] * CHAN_MAXF);
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf */
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Lt) + CcLt */
+ GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt);
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Lt) + CcLt */
+ GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt);
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]);
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-It) + CcIt */
+ GLchan It = texel[i][RCOMP], s = CHAN_MAX - It;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, It);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, It);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, It);
+ /* Av = Af(1-It) + Ac*It */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], s) + CHAN_PRODUCT(Ac, It);
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Ct) + CcCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]);
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Ct) + CcCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]);
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]);
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_BLEND) in texture_apply");
+ return;
+ }
+ break;
+
+ /* XXX don't clamp results if GLchan is float??? */
+
+ case GL_ADD: /* GL_EXT_texture_add_env */
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Rv = Rf */
+ /* Gv = Gf */
+ /* Bv = Bf */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ GLuint Lt = texel[i][RCOMP];
+ GLuint r = rgba[i][RCOMP] + Lt;
+ GLuint g = rgba[i][GCOMP] + Lt;
+ GLuint b = rgba[i][BCOMP] + Lt;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ GLuint Lt = texel[i][RCOMP];
+ GLuint r = rgba[i][RCOMP] + Lt;
+ GLuint g = rgba[i][GCOMP] + Lt;
+ GLuint b = rgba[i][BCOMP] + Lt;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ GLchan It = texel[i][RCOMP];
+ GLuint r = rgba[i][RCOMP] + It;
+ GLuint g = rgba[i][GCOMP] + It;
+ GLuint b = rgba[i][BCOMP] + It;
+ GLuint a = rgba[i][ACOMP] + It;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ rgba[i][ACOMP] = MIN2(a, CHAN_MAX);
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
+ GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
+ GLuint b = rgba[i][BCOMP] + texel[i][BCOMP];
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
+ GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
+ GLuint b = rgba[i][BCOMP] + texel[i][BCOMP];
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_ADD) in texture_apply");
+ return;
+ }
+ break;
+
+ default:
+ _mesa_problem(ctx, "Bad env mode in texture_apply");
+ return;
+ }
+}
+
+
+
+/**
+ * Apply texture mapping to a span of fragments.
+ */
+void
+_swrast_texture_span( GLcontext *ctx, struct sw_span *span )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ GLchan primary_rgba[MAX_WIDTH][4];
+ GLuint unit;
+
+ ASSERT(span->end < MAX_WIDTH);
+ ASSERT(span->arrayMask & SPAN_TEXTURE);
+
+ /*
+ * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)
+ */
+ if (swrast->_AnyTextureCombine)
+ MEMCPY(primary_rgba, span->array->rgba, 4 * span->end * sizeof(GLchan));
+
+ /*
+ * Must do all texture sampling before combining in order to
+ * accomodate GL_ARB_texture_env_crossbar.
+ */
+ for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
+ if (ctx->Texture.Unit[unit]._ReallyEnabled) {
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+ const struct gl_texture_object *curObj = texUnit->_Current;
+ GLfloat *lambda = span->array->lambda[unit];
+ GLchan (*texels)[4] = (GLchan (*)[4])
+ (swrast->TexelBuffer + unit * (span->end * 4 * sizeof(GLchan)));
+
+ /* adjust texture lod (lambda) */
+ if (span->arrayMask & SPAN_LAMBDA) {
+ if (texUnit->LodBias + curObj->LodBias != 0.0F) {
+ /* apply LOD bias, but don't clamp yet */
+ const GLfloat bias = CLAMP(texUnit->LodBias + curObj->LodBias,
+ -ctx->Const.MaxTextureLodBias,
+ ctx->Const.MaxTextureLodBias);
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ lambda[i] += bias;
+ }
+ }
+
+ if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) {
+ /* apply LOD clamping to lambda */
+ const GLfloat min = curObj->MinLod;
+ const GLfloat max = curObj->MaxLod;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ GLfloat l = lambda[i];
+ lambda[i] = CLAMP(l, min, max);
+ }
+ }
+ }
+
+ /* Sample the texture (span->end fragments) */
+ swrast->TextureSample[unit]( ctx, unit, texUnit->_Current, span->end,
+ (const GLfloat (*)[4]) span->array->texcoords[unit],
+ lambda, texels );
+
+ /* GL_SGI_texture_color_table */
+ if (texUnit->ColorTableEnabled) {
+ _mesa_lookup_rgba_chan(&texUnit->ColorTable, span->end, texels);
+ }
+ }
+ }
+
+ /*
+ * OK, now apply the texture (aka texture combine/blend).
+ * We modify the span->color.rgba values.
+ */
+ for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
+ if (ctx->Texture.Unit[unit]._ReallyEnabled) {
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+ if (texUnit->_CurrentCombine != &texUnit->_EnvMode ) {
+ texture_combine( ctx, unit, span->end,
+ (CONST GLchan (*)[4]) primary_rgba,
+ swrast->TexelBuffer,
+ span->array->rgba );
+ }
+ else {
+ /* conventional texture blend */
+ const GLchan (*texels)[4] = (const GLchan (*)[4])
+ (swrast->TexelBuffer + unit *
+ (span->end * 4 * sizeof(GLchan)));
+ texture_apply( ctx, texUnit, span->end,
+ (CONST GLchan (*)[4]) primary_rgba, texels,
+ span->array->rgba );
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 14:14:23 +0000