/* * Mesa 3-D graphics library * Version: 7.3 * * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * 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 "main/glheader.h" #include "main/context.h" #include "main/colormac.h" #include "main/imports.h" #include "main/texformat.h" #include "s_context.h" #include "s_texfilter.h" /* * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes * see 1-pixel bands of improperly weighted linear-filtered textures. * The tests/texwrap.c demo is a good test. * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0. * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x). */ #define FRAC(f) ((f) - IFLOOR(f)) /** * 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); } /** * Do linear interpolation of colors. */ static INLINE void lerp_rgba(GLchan result[4], GLfloat t, const GLchan a[4], const GLchan b[4]) { #if CHAN_TYPE == GL_FLOAT result[0] = LERP(t, a[0], b[0]); result[1] = LERP(t, a[1], b[1]); result[2] = LERP(t, a[2], b[2]); result[3] = LERP(t, a[3], b[3]); #elif CHAN_TYPE == GL_UNSIGNED_SHORT result[0] = (GLchan) (LERP(t, a[0], b[0]) + 0.5); result[1] = (GLchan) (LERP(t, a[1], b[1]) + 0.5); result[2] = (GLchan) (LERP(t, a[2], b[2]) + 0.5); result[3] = (GLchan) (LERP(t, a[3], b[3]) + 0.5); #else /* fixed point interpolants in [0, ILERP_SCALE] */ const GLint it = IROUND_POS(t * ILERP_SCALE); ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); result[0] = ILERP(it, a[0], b[0]); result[1] = ILERP(it, a[1], b[1]); result[2] = ILERP(it, a[2], b[2]); result[3] = ILERP(it, a[3], b[3]); #endif } /** * Do bilinear interpolation of colors. */ static INLINE void lerp_rgba_2d(GLchan result[4], GLfloat a, GLfloat b, const GLchan t00[4], const GLchan t10[4], const GLchan t01[4], const GLchan t11[4]) { #if CHAN_TYPE == GL_FLOAT result[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]); result[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]); result[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]); result[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]); #elif CHAN_TYPE == GL_UNSIGNED_SHORT result[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5); result[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5); result[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5); result[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5); #else const GLint ia = IROUND_POS(a * ILERP_SCALE); const GLint ib = IROUND_POS(b * ILERP_SCALE); ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); result[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]); result[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]); result[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]); result[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]); #endif } /** * Do trilinear interpolation of colors. */ static INLINE void lerp_rgba_3d(GLchan result[4], GLfloat a, GLfloat b, GLfloat c, const GLchan t000[4], const GLchan t100[4], const GLchan t010[4], const GLchan t110[4], const GLchan t001[4], const GLchan t101[4], const GLchan t011[4], const GLchan t111[4]) { GLuint k; /* compiler should unroll these short loops */ #if CHAN_TYPE == GL_FLOAT for (k = 0; k < 4; k++) { result[k] = lerp_3d(a, b, c, t000[k], t100[k], t010[k], t110[k], t001[k], t101[k], t011[k], t111[k]); } #elif CHAN_TYPE == GL_UNSIGNED_SHORT for (k = 0; k < 4; k++) { result[k] = (GLchan)(lerp_3d(a, b, c, t000[k], t100[k], t010[k], t110[k], t001[k], t101[k], t011[k], t111[k]) + 0.5F); } #else GLint ia = IROUND_POS(a * ILERP_SCALE); GLint ib = IROUND_POS(b * ILERP_SCALE); GLint ic = IROUND_POS(c * ILERP_SCALE); for (k = 0; k < 4; k++) { result[k] = ilerp_3d(ia, ib, ic, t000[k], t100[k], t010[k], t110[k], t001[k], t101[k], t011[k], t111[k]); } #endif } /** * If A is a signed integer, A % B doesn't give the right value for A < 0 * (in terms of texture repeat). Just casting to unsigned fixes that. */ #define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B)) /** * 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: * i0, i1 = returns two nearest texel indexes * weight = returns blend factor between texels */ static INLINE void linear_texel_locations(GLenum wrapMode, const struct gl_texture_image *img, GLint size, GLfloat s, GLint *i0, GLint *i1, GLfloat *weight) { GLfloat u; switch (wrapMode) { case GL_REPEAT: u = s * size - 0.5F; if (img->_IsPowerOfTwo) { *i0 = IFLOOR(u) & (size - 1); *i1 = (*i0 + 1) & (size - 1); } else { *i0 = REMAINDER(IFLOOR(u), size); *i1 = REMAINDER(*i0 + 1, size); } break; case GL_CLAMP_TO_EDGE: if (s <= 0.0F) u = 0.0F; else if (s >= 1.0F) u = (GLfloat) size; else u = s * size; u -= 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; if (*i0 < 0) *i0 = 0; if (*i1 >= (GLint) size) *i1 = size - 1; break; case GL_CLAMP_TO_BORDER: { const GLfloat min = -1.0F / (2.0F * size); const GLfloat max = 1.0F - min; if (s <= min) u = min * size; else if (s >= max) u = max * size; else u = s * size; u -= 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; } break; case GL_MIRRORED_REPEAT: { const GLint flr = IFLOOR(s); if (flr & 1) u = 1.0F - (s - (GLfloat) flr); else u = s - (GLfloat) flr; u = (u * size) - 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; if (*i0 < 0) *i0 = 0; if (*i1 >= (GLint) size) *i1 = size - 1; } break; case GL_MIRROR_CLAMP_EXT: u = FABSF(s); if (u >= 1.0F) u = (GLfloat) size; else u *= size; u -= 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; break; case GL_MIRROR_CLAMP_TO_EDGE_EXT: u = FABSF(s); if (u >= 1.0F) u = (GLfloat) size; else u *= size; u -= 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; if (*i0 < 0) *i0 = 0; if (*i1 >= (GLint) size) *i1 = size - 1; break; case GL_MIRROR_CLAMP_TO_BORDER_EXT: { const GLfloat min = -1.0F / (2.0F * size); const GLfloat max = 1.0F - min; u = FABSF(s); if (u <= min) u = min * size; else if (u >= max) u = max * size; else u *= size; u -= 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; } break; case GL_CLAMP: if (s <= 0.0F) u = 0.0F; else if (s >= 1.0F) u = (GLfloat) size; else u = s * size; u -= 0.5F; *i0 = IFLOOR(u); *i1 = *i0 + 1; break; default: _mesa_problem(NULL, "Bad wrap mode"); u = 0.0F; } *weight = FRAC(u); } /** * Used to compute texel location for nearest sampling. */ static INLINE GLint nearest_texel_location(GLenum wrapMode, const struct gl_texture_image *img, GLint size, GLfloat s) { GLint i; switch (wrapMode) { case GL_REPEAT: /* s limited to [0,1) */ /* i limited to [0,size-1] */ i = IFLOOR(s * size); if (img->_IsPowerOfTwo) i &= (size - 1); else i = REMAINDER(i, size); return i; case GL_CLAMP_TO_EDGE: { /* s limited to [min,max] */ /* i limited to [0, size-1] */ const GLfloat min = 1.0F / (2.0F * size); const GLfloat max = 1.0F - min; if (s < min) i = 0; else if (s > max) i = size - 1; else i = IFLOOR(s * size); } return i; case GL_CLAMP_TO_BORDER: { /* s limited to [min,max] */ /* i limited to [-1, size] */ const GLfloat min = -1.0F / (2.0F * size); const GLfloat max = 1.0F - min; if (s <= min) i = -1; else if (s >= max) i = size; else i = IFLOOR(s * size); } return i; case GL_MIRRORED_REPEAT: { const GLfloat min = 1.0F / (2.0F * size); const GLfloat max = 1.0F - min; const GLint flr = IFLOOR(s); GLfloat u; if (flr & 1) u = 1.0F - (s - (GLfloat) flr); else u = s - (GLfloat) flr; if (u < min) i = 0; else if (u > max) i = size - 1; else i = IFLOOR(u * size); } return i; case GL_MIRROR_CLAMP_EXT: { /* s limited to [0,1] */ /* i limited to [0,size-1] */ const GLfloat u = FABSF(s); if (u <= 0.0F) i = 0; else if (u >= 1.0F) i = size - 1; else i = IFLOOR(u * size); } return i; case GL_MIRROR_CLAMP_TO_EDGE_EXT: { /* s limited to [min,max] */ /* i limited to [0, size-1] */ const GLfloat min = 1.0F / (2.0F * size); const GLfloat max = 1.0F - min; const GLfloat u = FABSF(s); if (u < min) i = 0; else if (u > max) i = size - 1; else i = IFLOOR(u * size); } return i; case GL_MIRROR_CLAMP_TO_BORDER_EXT: { /* s limited to [min,max] */ /* i limited to [0, size-1] */ const GLfloat min = -1.0F / (2.0F * size); const GLfloat max = 1.0F - min; const GLfloat u = FABSF(s); if (u < min) i = -1; else if (u > max) i = size; else i = IFLOOR(u * size); } return i; case GL_CLAMP: /* s limited to [0,1] */ /* i limited to [0,size-1] */ if (s <= 0.0F) i = 0; else if (s >= 1.0F) i = size - 1; else i = IFLOOR(s * size); return i; default: _mesa_problem(NULL, "Bad wrap mode"); return 0; } } /* Power of two image sizes only */ static INLINE void linear_repeat_texel_location(GLuint size, GLfloat s, GLint *i0, GLint *i1, GLfloat *weight) { GLfloat u = s * size - 0.5F; *i0 = IFLOOR(u) & (size - 1); *i1 = (*i0 + 1) & (size - 1); *weight = FRAC(u); } /** * For linear interpolation between mipmap levels N and N+1, this function * computes N. */ static INLINE GLint linear_mipmap_level(const struct gl_texture_object *tObj, GLfloat lambda) { if (lambda < 0.0F) return tObj->BaseLevel; else if (lambda > tObj->_MaxLambda) return (GLint) (tObj->BaseLevel + tObj->_MaxLambda); else return (GLint) (tObj->BaseLevel + lambda); } /** * Compute the nearest mipmap level to take texels from. */ static INLINE GLint nearest_mipmap_level(const struct gl_texture_object *tObj, GLfloat lambda) { GLfloat l; GLint level; 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; return level; } /* * 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(const struct gl_texture_object *tObj, GLuint n, const GLfloat lambda[], GLuint *minStart, GLuint *minEnd, GLuint *magStart, GLuint *magEnd) { GLfloat minMagThresh; /* we shouldn't be here if minfilter == magfilter */ ASSERT(tObj->MinFilter != tObj->MagFilter); /* This bit comes from the OpenGL spec: */ if (tObj->MagFilter == GL_LINEAR && (tObj->MinFilter == GL_NEAREST_MIPMAP_NEAREST || tObj->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) { minMagThresh = 0.5F; } else { minMagThresh = 0.0F; } #if 0 /* DEBUG CODE: Verify that lambda[] is monotonic. * 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 */ if (lambda[0] <= minMagThresh && (n <= 1 || lambda[n-1] <= minMagThresh)) { /* magnification for whole span */ *magStart = 0; *magEnd = n; *minStart = *minEnd = 0; } else if (lambda[0] > minMagThresh && (n <=1 || 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 INLINE void sample_1d_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, const struct gl_texture_image *img, const GLfloat texcoord[4], GLchan rgba[4]) { const GLint width = img->Width2; /* without border, power of two */ GLint i; i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]); /* skip over the border, if any */ i += img->Border; if (i < 0 || i >= (GLint) img->Width) { /* Need this test for GL_CLAMP_TO_BORDER mode */ COPY_CHAN4(rgba, tObj->_BorderChan); } else { img->FetchTexelc(img, i, 0, 0, rgba); } } /** * Return the texture sample for coordinate (s) using GL_LINEAR filter. */ static INLINE void sample_1d_linear(GLcontext *ctx, const struct gl_texture_object *tObj, const struct gl_texture_image *img, const GLfloat texcoord[4], GLchan rgba[4]) { const GLint width = img->Width2; GLint i0, i1; GLbitfield useBorderColor = 0x0; GLfloat a; GLchan t0[4], t1[4]; /* texels */ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a); if (img->Border) { i0 += img->Border; i1 += img->Border; } else { if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT; if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT; } /* 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); } lerp_rgba(rgba, a, t0, t1); } 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 = nearest_mipmap_level(tObj, lambda[i]); 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 = nearest_mipmap_level(tObj, lambda[i]); sample_1d_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]); } } 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 = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } static void sample_1d_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } /** Sample 1D texture, nearest filtering for both min/magnification */ static void sample_nearest_1d( GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4] ) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_1d_nearest(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 1D texture, linear filtering for both min/magnification */ static void sample_linear_1d( GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4] ) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_1d_linear(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 1D texture, using lambda to choose between min/magnification */ static void sample_lambda_1d( GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4] ) { GLuint minStart, minEnd; /* texels with minification */ GLuint magStart, magEnd; /* texels with magnification */ GLuint i; ASSERT(lambda != NULL); compute_min_mag_ranges(tObj, 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; i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]); j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]); /* skip over the border, if any */ i += img->Border; 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 . */ 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; GLbitfield useBorderColor = 0x0; GLfloat a, b; GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */ linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a); linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b); if (img->Border) { i0 += img->Border; 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; } /* 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); } lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11); } /** * As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT. * We don't have to worry about the texture border. */ 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 wi, wj; GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */ (void) ctx; ASSERT(tObj->WrapS == GL_REPEAT); ASSERT(tObj->WrapT == GL_REPEAT); ASSERT(img->Border == 0); ASSERT(img->TexFormat->BaseFormat != GL_COLOR_INDEX); ASSERT(img->_IsPowerOfTwo); linear_repeat_texel_location(width, texcoord[0], &i0, &i1, &wi); linear_repeat_texel_location(height, texcoord[1], &j0, &j1, &wj); img->FetchTexelc(img, i0, j0, 0, t00); img->FetchTexelc(img, i1, j0, 0, t10); img->FetchTexelc(img, i0, j1, 0, t01); img->FetchTexelc(img, i1, j1, 0, t11); lerp_rgba_2d(rgba, wi, wj, t00, t10, t01, t11); } static void sample_2d_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; for (i = 0; i < n; i++) { GLint level = nearest_mipmap_level(tObj, lambda[i]); 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 = nearest_mipmap_level(tObj, lambda[i]); 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 = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } 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 = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } static void sample_2d_linear_mipmap_linear_repeat(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); ASSERT(tObj->WrapS == GL_REPEAT); ASSERT(tObj->WrapT == GL_REPEAT); for (i = 0; i < n; i++) { GLint level = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } /** Sample 2D texture, nearest filtering for both min/magnification */ static void sample_nearest_2d(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_2d_nearest(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 2D texture, linear filtering for both min/magnification */ static void sample_linear_2d(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; if (tObj->WrapS == GL_REPEAT && tObj->WrapT == GL_REPEAT && image->_IsPowerOfTwo && 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, 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) lambda; ASSERT(tObj->WrapS==GL_REPEAT); ASSERT(tObj->WrapT==GL_REPEAT); ASSERT(img->Border==0); ASSERT(img->TexFormat->MesaFormat==MESA_FORMAT_RGB); ASSERT(img->_IsPowerOfTwo); for (k=0; kData) + 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, 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) lambda; ASSERT(tObj->WrapS==GL_REPEAT); ASSERT(tObj->WrapT==GL_REPEAT); ASSERT(img->Border==0); ASSERT(img->TexFormat->MesaFormat==MESA_FORMAT_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); } } /** Sample 2D texture, using lambda to choose between min/magnification */ static void sample_lambda_2d(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { 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->TexFormat->BaseFormat != GL_COLOR_INDEX) && tImg->_IsPowerOfTwo; ASSERT(lambda != NULL); compute_min_mag_ranges(tObj, 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: opt_sample_rgb_2d(ctx, tObj, m, texcoords + minStart, NULL, rgba + minStart); break; case MESA_FORMAT_RGBA: opt_sample_rgba_2d(ctx, tObj, m, texcoords + minStart, NULL, rgba + minStart); break; default: sample_nearest_2d(ctx, tObj, m, texcoords + minStart, NULL, rgba + minStart ); } } else { sample_nearest_2d(ctx, tObj, m, texcoords + minStart, NULL, rgba + minStart); } break; case GL_LINEAR: sample_linear_2d(ctx, 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: opt_sample_rgb_2d(ctx, tObj, m, texcoords + magStart, NULL, rgba + magStart); break; case MESA_FORMAT_RGBA: opt_sample_rgba_2d(ctx, tObj, m, texcoords + magStart, NULL, rgba + magStart); break; default: sample_nearest_2d(ctx, tObj, m, texcoords + magStart, NULL, rgba + magStart ); } } else { sample_nearest_2d(ctx, tObj, m, texcoords + magStart, NULL, rgba + magStart); } break; case GL_LINEAR: sample_linear_2d(ctx, 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 INLINE void sample_3d_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, const struct gl_texture_image *img, const GLfloat texcoord[4], GLchan rgba[4]) { 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; i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]); j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]); k = nearest_texel_location(tObj->WrapR, img, depth, texcoord[2]); if (i < 0 || i >= (GLint) img->Width || j < 0 || j >= (GLint) img->Height || k < 0 || k >= (GLint) img->Depth) { /* Need this test for GL_CLAMP_TO_BORDER mode */ COPY_CHAN4(rgba, tObj->_BorderChan); } 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; GLbitfield useBorderColor = 0x0; GLfloat a, b, c; GLchan t000[4], t010[4], t001[4], t011[4]; GLchan t100[4], t110[4], t101[4], t111[4]; linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a); linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b); linear_texel_locations(tObj->WrapR, img, depth, texcoord[2], &k0, &k1, &c); if (img->Border) { i0 += img->Border; 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; } /* 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 */ lerp_rgba_3d(rgba, a, b, c, t000, t100, t010, t110, t001, t101, t011, t111); } static void sample_3d_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4] ) { GLuint i; for (i = 0; i < n; i++) { GLint level = nearest_mipmap_level(tObj, lambda[i]); 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 = nearest_mipmap_level(tObj, lambda[i]); 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 = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } 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 = linear_mipmap_level(tObj, lambda[i]); 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); lerp_rgba(rgba[i], f, t0, t1); } } } /** Sample 3D texture, nearest filtering for both min/magnification */ static void sample_nearest_3d(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_3d_nearest(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 3D texture, linear filtering for both min/magnification */ static void sample_linear_3d(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_3d_linear(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 3D texture, using lambda to choose between min/magnification */ static void sample_lambda_3d(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint minStart, minEnd; /* texels with minification */ GLuint magStart, magEnd; /* texels with magnification */ GLuint i; ASSERT(lambda != NULL); compute_min_mag_ranges(tObj, 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 GLfloat arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz); GLuint face; GLfloat sc, tc, ma; if (arx > ary && arx > arz) { if (rx >= 0.0F) { face = FACE_POS_X; sc = -rz; tc = -ry; ma = arx; } else { face = FACE_NEG_X; sc = rz; tc = -ry; ma = arx; } } else if (ary > arx && ary > arz) { if (ry >= 0.0F) { face = FACE_POS_Y; sc = rx; tc = rz; ma = ary; } else { face = FACE_NEG_Y; sc = rx; tc = -rz; ma = ary; } } else { if (rz > 0.0F) { face = FACE_POS_Z; sc = rx; tc = -ry; ma = arz; } else { face = 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 (const struct gl_texture_image **) texObj->Image[face]; } static void sample_nearest_cube(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; (void) lambda; for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newCoord[4]; images = choose_cube_face(tObj, texcoords[i], newCoord); sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel], newCoord, rgba[i]); } } static void sample_linear_cube(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; (void) lambda; for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newCoord[4]; images = choose_cube_face(tObj, texcoords[i], newCoord); sample_2d_linear(ctx, tObj, images[tObj->BaseLevel], newCoord, rgba[i]); } } static void sample_cube_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newCoord[4]; GLint level; images = choose_cube_face(tObj, texcoord[i], newCoord); /* XXX we actually need to recompute lambda here based on the newCoords. * But we would need the texcoords of adjacent fragments to compute that * properly, and we don't have those here. * For now, do an approximation: subtracting 1 from the chosen mipmap * level seems to work in some test cases. * The same adjustment is done in the next few functions. */ level = nearest_mipmap_level(tObj, lambda[i]); level = MAX2(level - 1, 0); sample_2d_nearest(ctx, tObj, images[level], newCoord, rgba[i]); } } static void sample_cube_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newCoord[4]; GLint level = nearest_mipmap_level(tObj, lambda[i]); level = MAX2(level - 1, 0); /* see comment above */ images = choose_cube_face(tObj, texcoord[i], newCoord); sample_2d_linear(ctx, tObj, images[level], newCoord, rgba[i]); } } static void sample_cube_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newCoord[4]; GLint level = linear_mipmap_level(tObj, lambda[i]); level = MAX2(level - 1, 0); /* see comment above */ 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); lerp_rgba(rgba[i], f, t0, t1); } } } static void sample_cube_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newCoord[4]; GLint level = linear_mipmap_level(tObj, lambda[i]); level = MAX2(level - 1, 0); /* see comment above */ 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); lerp_rgba(rgba[i], f, t0, t1); } } } /** Sample cube texture, using lambda to choose between min/magnification */ static void sample_lambda_cube(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint minStart, minEnd; /* texels with minification */ GLuint magStart, magEnd; /* texels with magnification */ ASSERT(lambda != NULL); compute_min_mag_ranges(tObj, 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, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR: sample_linear_cube(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_NEAREST_MIPMAP_NEAREST: sample_cube_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR_MIPMAP_NEAREST: sample_cube_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_NEAREST_MIPMAP_LINEAR: sample_cube_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR_MIPMAP_LINEAR: sample_cube_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; default: _mesa_problem(ctx, "Bad min filter in sample_lambda_cube"); } } if (magStart < magEnd) { /* do the magnified texels */ const GLuint m = magEnd - magStart; switch (tObj->MagFilter) { case GL_NEAREST: sample_nearest_cube(ctx, tObj, m, texcoords + magStart, lambda + magStart, rgba + magStart); break; case GL_LINEAR: sample_linear_cube(ctx, tObj, m, texcoords + magStart, lambda + magStart, rgba + magStart); break; default: _mesa_problem(ctx, "Bad mag filter in sample_lambda_cube"); } } } /**********************************************************************/ /* Texture Rectangle Sampling Functions */ /**********************************************************************/ /** * Do clamp/wrap for a texture rectangle coord, GL_NEAREST filter mode. */ static INLINE GLint clamp_rect_coord_nearest(GLenum wrapMode, GLfloat coord, GLint max) { switch (wrapMode) { case GL_CLAMP: return IFLOOR( CLAMP(coord, 0.0F, max - 1) ); case GL_CLAMP_TO_EDGE: return IFLOOR( CLAMP(coord, 0.5F, max - 0.5F) ); case GL_CLAMP_TO_BORDER: return IFLOOR( CLAMP(coord, -0.5F, max + 0.5F) ); default: _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_nearest"); return 0; } } /** * As above, but GL_LINEAR filtering. */ static INLINE void clamp_rect_coord_linear(GLenum wrapMode, GLfloat coord, GLint max, GLint *i0out, GLint *i1out, GLfloat *weight) { GLfloat fcol; GLint i0, i1; switch (wrapMode) { case GL_CLAMP: /* Not exactly what the spec says, but it matches NVIDIA output */ fcol = CLAMP(coord - 0.5F, 0.0, max-1); i0 = IFLOOR(fcol); i1 = i0 + 1; break; case GL_CLAMP_TO_EDGE: fcol = CLAMP(coord, 0.5F, max - 0.5F); fcol -= 0.5F; i0 = IFLOOR(fcol); i1 = i0 + 1; if (i1 > max - 1) i1 = max - 1; break; case GL_CLAMP_TO_BORDER: fcol = CLAMP(coord, -0.5F, max + 0.5F); fcol -= 0.5F; i0 = IFLOOR(fcol); i1 = i0 + 1; break; default: _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_linear"); i0 = i1 = 0; fcol = 0.0F; } *i0out = i0; *i1out = i1; *weight = FRAC(fcol); } static void sample_nearest_rect(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { const struct gl_texture_image *img = tObj->Image[0][0]; const GLint width = img->Width; const GLint height = img->Height; GLuint i; (void) ctx; (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->TexFormat->BaseFormat != GL_COLOR_INDEX); for (i = 0; i < n; i++) { GLint row, col; col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width); row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height); if (col < 0 || col >= width || row < 0 || row >= height) COPY_CHAN4(rgba[i], tObj->_BorderChan); else img->FetchTexelc(img, col, row, 0, rgba[i]); } } static void sample_linear_rect(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { const struct gl_texture_image *img = tObj->Image[0][0]; const GLint width = img->Width; const GLint height = img->Height; GLuint i; (void) ctx; (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->TexFormat->BaseFormat != GL_COLOR_INDEX); for (i = 0; i < n; i++) { GLint i0, j0, i1, j1; GLchan t00[4], t01[4], t10[4], t11[4]; GLfloat a, b; GLbitfield useBorderColor = 0x0; clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0], width, &i0, &i1, &a); clamp_rect_coord_linear(tObj->WrapT, texcoords[i][1], height, &j0, &j1, &b); /* compute integer rows/columns */ if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT; if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT; if (j0 < 0 || j0 >= height) useBorderColor |= J0BIT; if (j1 < 0 || j1 >= height) useBorderColor |= J1BIT; /* get four texel samples */ if (useBorderColor & (I0BIT | J0BIT)) COPY_CHAN4(t00, tObj->_BorderChan); 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); lerp_rgba_2d(rgba[i], a, b, t00, t10, t01, t11); } } /** Sample Rect texture, using lambda to choose between min/magnification */ static void sample_lambda_rect(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { 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(tObj, n, lambda, &minStart, &minEnd, &magStart, &magEnd); if (minStart < minEnd) { if (tObj->MinFilter == GL_NEAREST) { sample_nearest_rect(ctx, tObj, minEnd - minStart, texcoords + minStart, NULL, rgba + minStart); } else { sample_linear_rect(ctx, tObj, minEnd - minStart, texcoords + minStart, NULL, rgba + minStart); } } if (magStart < magEnd) { if (tObj->MagFilter == GL_NEAREST) { sample_nearest_rect(ctx, tObj, magEnd - magStart, texcoords + magStart, NULL, rgba + magStart); } else { sample_linear_rect(ctx, tObj, magEnd - magStart, texcoords + magStart, NULL, rgba + magStart); } } } /**********************************************************************/ /* 2D Texture Array Sampling Functions */ /**********************************************************************/ /** * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter. */ static void sample_2d_array_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->Depth; GLint i, j; GLint array; (void) ctx; i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]); j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]); array = clamp_rect_coord_nearest(tObj->WrapR, texcoord[2], depth); if (i < 0 || i >= (GLint) img->Width || j < 0 || j >= (GLint) img->Height || array < 0 || array >= (GLint) img->Depth) { /* Need this test for GL_CLAMP_TO_BORDER mode */ COPY_CHAN4(rgba, tObj->_BorderChan); } else { img->FetchTexelc(img, i, j, array, rgba); } } /** * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter. */ static void sample_2d_array_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->Depth; GLint i0, j0, i1, j1; GLint array; GLbitfield useBorderColor = 0x0; GLfloat a, b; GLchan t00[4], t01[4], t10[4], t11[4]; linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a); linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b); array = clamp_rect_coord_nearest(tObj->WrapR, texcoord[2], depth); if (array < 0 || array >= depth) { COPY_CHAN4(rgba, tObj->_BorderChan); } else { if (img->Border) { i0 += img->Border; i1 += img->Border; j0 += img->Border; j1 += 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; } /* Fetch texels */ if (useBorderColor & (I0BIT | J0BIT)) { COPY_CHAN4(t00, tObj->_BorderChan); } else { img->FetchTexelc(img, i0, j0, array, t00); } if (useBorderColor & (I1BIT | J0BIT)) { COPY_CHAN4(t10, tObj->_BorderChan); } else { img->FetchTexelc(img, i1, j0, array, t10); } if (useBorderColor & (I0BIT | J1BIT)) { COPY_CHAN4(t01, tObj->_BorderChan); } else { img->FetchTexelc(img, i0, j1, array, t01); } if (useBorderColor & (I1BIT | J1BIT)) { COPY_CHAN4(t11, tObj->_BorderChan); } else { img->FetchTexelc(img, i1, j1, array, t11); } /* trilinear interpolation of samples */ lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11); } } static void sample_2d_array_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; for (i = 0; i < n; i++) { GLint level = nearest_mipmap_level(tObj, lambda[i]); sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]); } } static void sample_2d_array_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = nearest_mipmap_level(tObj, lambda[i]); sample_2d_array_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]); } } static void sample_2d_array_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = linear_mipmap_level(tObj, lambda[i]); if (level >= tObj->_MaxLevel) { sample_2d_array_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_array_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0); sample_2d_array_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1); lerp_rgba(rgba[i], f, t0, t1); } } } static void sample_2d_array_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = linear_mipmap_level(tObj, lambda[i]); if (level >= tObj->_MaxLevel) { sample_2d_array_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_array_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0); sample_2d_array_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1); lerp_rgba(rgba[i], f, t0, t1); } } } /** Sample 2D Array texture, nearest filtering for both min/magnification */ static void sample_nearest_2d_array(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_2d_array_nearest(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 2D Array texture, linear filtering for both min/magnification */ static void sample_linear_2d_array(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_2d_array_linear(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 2D Array texture, using lambda to choose between min/magnification */ static void sample_lambda_2d_array(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint minStart, minEnd; /* texels with minification */ GLuint magStart, magEnd; /* texels with magnification */ GLuint i; ASSERT(lambda != NULL); compute_min_mag_ranges(tObj, 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_2d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; case GL_LINEAR: for (i = minStart; i < minEnd; i++) sample_2d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; case GL_NEAREST_MIPMAP_NEAREST: sample_2d_array_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR_MIPMAP_NEAREST: sample_2d_array_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_NEAREST_MIPMAP_LINEAR: sample_2d_array_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR_MIPMAP_LINEAR: sample_2d_array_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; default: _mesa_problem(ctx, "Bad min filter in sample_2d_array_texture"); return; } } if (magStart < magEnd) { /* do the magnified texels */ switch (tObj->MagFilter) { case GL_NEAREST: for (i = magStart; i < magEnd; i++) sample_2d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; case GL_LINEAR: for (i = magStart; i < magEnd; i++) sample_2d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; default: _mesa_problem(ctx, "Bad mag filter in sample_2d_array_texture"); return; } } } /**********************************************************************/ /* 1D Texture Array Sampling Functions */ /**********************************************************************/ /** * Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter. */ static void sample_1d_array_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->Height; GLint i; GLint array; (void) ctx; i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]); array = clamp_rect_coord_nearest(tObj->WrapT, texcoord[1], height); if (i < 0 || i >= (GLint) img->Width || array < 0 || array >= (GLint) img->Height) { /* Need this test for GL_CLAMP_TO_BORDER mode */ COPY_CHAN4(rgba, tObj->_BorderChan); } else { img->FetchTexelc(img, i, array, 0, rgba); } } /** * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter. */ static void sample_1d_array_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->Height; GLint i0, i1; GLint array; GLbitfield useBorderColor = 0x0; GLfloat a; GLchan t0[4], t1[4]; linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a); array = clamp_rect_coord_nearest(tObj->WrapT, texcoord[1], height); if (img->Border) { i0 += img->Border; i1 += img->Border; } else { /* check if sampling texture border color */ if (i0 < 0 || i0 >= width) useBorderColor |= I0BIT; if (i1 < 0 || i1 >= width) useBorderColor |= I1BIT; } if (array < 0 || array >= height) useBorderColor |= K0BIT; /* Fetch texels */ if (useBorderColor & (I0BIT | K0BIT)) { COPY_CHAN4(t0, tObj->_BorderChan); } else { img->FetchTexelc(img, i0, array, 0, t0); } if (useBorderColor & (I1BIT | K0BIT)) { COPY_CHAN4(t1, tObj->_BorderChan); } else { img->FetchTexelc(img, i1, array, 0, t1); } /* bilinear interpolation of samples */ lerp_rgba(rgba, a, t0, t1); } static void sample_1d_array_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; for (i = 0; i < n; i++) { GLint level = nearest_mipmap_level(tObj, lambda[i]); sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]); } } static void sample_1d_array_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = nearest_mipmap_level(tObj, lambda[i]); sample_1d_array_linear(ctx, tObj, tObj->Image[0][level], texcoord[i], rgba[i]); } } static void sample_1d_array_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = linear_mipmap_level(tObj, lambda[i]); if (level >= tObj->_MaxLevel) { sample_1d_array_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_1d_array_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0); sample_1d_array_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1); lerp_rgba(rgba[i], f, t0, t1); } } } static void sample_1d_array_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoord[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; ASSERT(lambda != NULL); for (i = 0; i < n; i++) { GLint level = linear_mipmap_level(tObj, lambda[i]); if (level >= tObj->_MaxLevel) { sample_1d_array_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_1d_array_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0); sample_1d_array_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1); lerp_rgba(rgba[i], f, t0, t1); } } } /** Sample 1D Array texture, nearest filtering for both min/magnification */ static void sample_nearest_1d_array(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_1d_array_nearest(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 1D Array texture, linear filtering for both min/magnification */ static void sample_linear_1d_array(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) lambda; for (i = 0; i < n; i++) { sample_1d_array_linear(ctx, tObj, image, texcoords[i], rgba[i]); } } /** Sample 1D Array texture, using lambda to choose between min/magnification */ static void sample_lambda_1d_array(GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint minStart, minEnd; /* texels with minification */ GLuint magStart, magEnd; /* texels with magnification */ GLuint i; ASSERT(lambda != NULL); compute_min_mag_ranges(tObj, 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_1d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; case GL_LINEAR: for (i = minStart; i < minEnd; i++) sample_1d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; case GL_NEAREST_MIPMAP_NEAREST: sample_1d_array_nearest_mipmap_nearest(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR_MIPMAP_NEAREST: sample_1d_array_linear_mipmap_nearest(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_NEAREST_MIPMAP_LINEAR: sample_1d_array_nearest_mipmap_linear(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; case GL_LINEAR_MIPMAP_LINEAR: sample_1d_array_linear_mipmap_linear(ctx, tObj, m, texcoords + minStart, lambda + minStart, rgba + minStart); break; default: _mesa_problem(ctx, "Bad min filter in sample_1d_array_texture"); return; } } if (magStart < magEnd) { /* do the magnified texels */ switch (tObj->MagFilter) { case GL_NEAREST: for (i = magStart; i < magEnd; i++) sample_1d_array_nearest(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; case GL_LINEAR: for (i = magStart; i < magEnd; i++) sample_1d_array_linear(ctx, tObj, tObj->Image[0][tObj->BaseLevel], texcoords[i], rgba[i]); break; default: _mesa_problem(ctx, "Bad mag filter in sample_1d_array_texture"); return; } } } /** * Sample a shadow/depth texture. */ static void sample_depth_texture( GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan texel[][4] ) { const GLint baseLevel = tObj->BaseLevel; const struct gl_texture_image *img = tObj->Image[0][baseLevel]; const GLint width = img->Width; const GLint height = img->Height; const GLint depth = img->Depth; const GLuint compare_coord = (tObj->Target == GL_TEXTURE_2D_ARRAY_EXT) ? 3 : 2; GLchan ambient; GLenum function; GLchan result; (void) lambda; ASSERT(img->TexFormat->BaseFormat == GL_DEPTH_COMPONENT || img->TexFormat->BaseFormat == GL_DEPTH_STENCIL_EXT); ASSERT(tObj->Target == GL_TEXTURE_1D || tObj->Target == GL_TEXTURE_2D || tObj->Target == GL_TEXTURE_RECTANGLE_NV || tObj->Target == GL_TEXTURE_1D_ARRAY_EXT || tObj->Target == GL_TEXTURE_2D_ARRAY_EXT); UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient); /* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */ function = tObj->_Function; if (tObj->MagFilter == GL_NEAREST) { GLuint i; for (i = 0; i < n; i++) { GLfloat depthSample; GLint col, row, slice; switch (tObj->Target) { case GL_TEXTURE_RECTANGLE_ARB: col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width); row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height); slice = 0; break; case GL_TEXTURE_1D: col = nearest_texel_location(tObj->WrapS, img, width, texcoords[i][0]); row = 0; slice = 0; break; case GL_TEXTURE_2D: col = nearest_texel_location(tObj->WrapS, img, width, texcoords[i][0]); row = nearest_texel_location(tObj->WrapT, img, height, texcoords[i][1]); slice = 0; break; case GL_TEXTURE_1D_ARRAY_EXT: col = nearest_texel_location(tObj->WrapS, img, width, texcoords[i][0]); row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height); slice = 0; break; case GL_TEXTURE_2D_ARRAY_EXT: col = nearest_texel_location(tObj->WrapS, img, width, texcoords[i][0]); row = nearest_texel_location(tObj->WrapT, img, height, texcoords[i][1]); slice = clamp_rect_coord_nearest(tObj->WrapR, texcoords[i][2], depth); break; default: col = row = slice = 0; } if (col >= 0 && row >= 0 && col < width && row < height && slice >= 0 && slice < depth) { img->FetchTexelf(img, col, row, slice, &depthSample); } else { depthSample = tObj->BorderColor[0]; } switch (function) { case GL_LEQUAL: result = (texcoords[i][compare_coord] <= depthSample) ? CHAN_MAX : ambient; break; case GL_GEQUAL: result = (texcoords[i][compare_coord] >= depthSample) ? CHAN_MAX : ambient; break; case GL_LESS: result = (texcoords[i][compare_coord] < depthSample) ? CHAN_MAX : ambient; break; case GL_GREATER: result = (texcoords[i][compare_coord] > depthSample) ? CHAN_MAX : ambient; break; case GL_EQUAL: result = (texcoords[i][compare_coord] == depthSample) ? CHAN_MAX : ambient; break; case GL_NOTEQUAL: result = (texcoords[i][compare_coord] != depthSample) ? CHAN_MAX : ambient; break; case GL_ALWAYS: result = CHAN_MAX; break; case GL_NEVER: result = ambient; break; case GL_NONE: CLAMPED_FLOAT_TO_CHAN(result, depthSample); break; default: _mesa_problem(ctx, "Bad compare func in sample_depth_texture"); return; } 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; GLint slice; GLfloat a, b; GLuint useBorderTexel; switch (tObj->Target) { case GL_TEXTURE_RECTANGLE_ARB: clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0], width, &i0, &i1, &a); clamp_rect_coord_linear(tObj->WrapT, texcoords[i][1], height, &j0, &j1, &b); slice = 0; break; case GL_TEXTURE_1D: case GL_TEXTURE_2D: linear_texel_locations(tObj->WrapS, img, width, texcoords[i][0], &i0, &i1, &a); linear_texel_locations(tObj->WrapT, img, height, texcoords[i][1], &j0, &j1, &b); slice = 0; break; case GL_TEXTURE_1D_ARRAY_EXT: linear_texel_locations(tObj->WrapS, img, width, texcoords[i][0], &i0, &i1, &a); j0 = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height); j1 = j0; slice = 0; break; case GL_TEXTURE_2D_ARRAY_EXT: linear_texel_locations(tObj->WrapS, img, width, texcoords[i][0], &i0, &i1, &a); linear_texel_locations(tObj->WrapT, img, height, texcoords[i][1], &j0, &j1, &b); slice = clamp_rect_coord_nearest(tObj->WrapR, texcoords[i][2], depth); break; default: slice = 0; } useBorderTexel = 0; if (img->Border) { i0 += img->Border; i1 += img->Border; if (tObj->Target != GL_TEXTURE_1D_ARRAY_EXT) { j0 += img->Border; j1 += img->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; } if (slice < 0 || slice >= (GLint) depth) { depth00 = tObj->BorderColor[0]; depth01 = tObj->BorderColor[0]; depth10 = tObj->BorderColor[0]; depth11 = tObj->BorderColor[0]; } else { /* get four depth samples from the texture */ if (useBorderTexel & (I0BIT | J0BIT)) { depth00 = tObj->BorderColor[0]; } else { img->FetchTexelf(img, i0, j0, slice, &depth00); } if (useBorderTexel & (I1BIT | J0BIT)) { depth10 = tObj->BorderColor[0]; } else { img->FetchTexelf(img, i1, j0, slice, &depth10); } if (tObj->Target != GL_TEXTURE_1D_ARRAY_EXT) { if (useBorderTexel & (I0BIT | J1BIT)) { depth01 = tObj->BorderColor[0]; } else { img->FetchTexelf(img, i0, j1, slice, &depth01); } if (useBorderTexel & (I1BIT | J1BIT)) { depth11 = tObj->BorderColor[0]; } else { img->FetchTexelf(img, i1, j1, slice, &depth11); } } else { depth01 = depth00; depth11 = depth10; } } if (0) { /* compute a single weighted depth sample and do one comparison */ const GLfloat depthSample = lerp_2d(a, b, depth00, depth10, depth01, depth11); if ((depthSample <= texcoords[i][compare_coord] && function == GL_LEQUAL) || (depthSample >= texcoords[i][compare_coord] && function == GL_GEQUAL)) { result = ambient; } else { result = CHAN_MAX; } } else { /* Do four depth/R comparisons and compute a weighted result. * If this touches on somebody's I.P., I'll remove this code * upon request. */ const GLfloat d = (CHAN_MAXF - (GLfloat) ambient) * 0.25F; GLfloat luminance = CHAN_MAXF; switch (function) { case GL_LEQUAL: if (depth00 <= texcoords[i][compare_coord]) luminance -= d; if (depth01 <= texcoords[i][compare_coord]) luminance -= d; if (depth10 <= texcoords[i][compare_coord]) luminance -= d; if (depth11 <= texcoords[i][compare_coord]) luminance -= d; result = (GLchan) luminance; break; case GL_GEQUAL: if (depth00 >= texcoords[i][compare_coord]) luminance -= d; if (depth01 >= texcoords[i][compare_coord]) luminance -= d; if (depth10 >= texcoords[i][compare_coord]) luminance -= d; if (depth11 >= texcoords[i][compare_coord]) luminance -= d; result = (GLchan) luminance; break; case GL_LESS: if (depth00 < texcoords[i][compare_coord]) luminance -= d; if (depth01 < texcoords[i][compare_coord]) luminance -= d; if (depth10 < texcoords[i][compare_coord]) luminance -= d; if (depth11 < texcoords[i][compare_coord]) luminance -= d; result = (GLchan) luminance; break; case GL_GREATER: if (depth00 > texcoords[i][compare_coord]) luminance -= d; if (depth01 > texcoords[i][compare_coord]) luminance -= d; if (depth10 > texcoords[i][compare_coord]) luminance -= d; if (depth11 > texcoords[i][compare_coord]) luminance -= d; result = (GLchan) luminance; break; case GL_EQUAL: if (depth00 == texcoords[i][compare_coord]) luminance -= d; if (depth01 == texcoords[i][compare_coord]) luminance -= d; if (depth10 == texcoords[i][compare_coord]) luminance -= d; if (depth11 == texcoords[i][compare_coord]) luminance -= d; result = (GLchan) luminance; break; case GL_NOTEQUAL: if (depth00 != texcoords[i][compare_coord]) luminance -= d; if (depth01 != texcoords[i][compare_coord]) luminance -= d; if (depth10 != texcoords[i][compare_coord]) luminance -= d; if (depth11 != texcoords[i][compare_coord]) luminance -= d; result = (GLchan) luminance; break; case GL_ALWAYS: result = 0; break; case GL_NEVER: result = CHAN_MAX; break; case GL_NONE: /* ordinary bilinear filtering */ { const GLfloat 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->TexFormat->BaseFormat != GL_DEPTH_COMPONENT) { _mesa_problem(ctx,"GL_TEXTURE_COMPARE_SGIX enabled with non-depth texture"); return; } UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient); if (texObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) { lequal = GL_TRUE; gequal = GL_FALSE; } else { lequal = GL_FALSE; gequal = GL_TRUE; } { GLuint i; for (i = 0; i < n; i++) { const GLint K = 3; GLint col, row, ii, jj, imin, imax, jmin, jmax, samples, count; GLfloat w; GLchan lum; col = nearest_texel_location(texObj->WrapS, img, width, texcoords[i][0]); row = nearest_texel_location(texObj->WrapT, img, height, texcoords[i][1]); 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 programs don't observe the texture enable/disable flags. */ static void null_sample_func( GLcontext *ctx, const struct gl_texture_object *tObj, GLuint n, const GLfloat texcoords[][4], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; (void) ctx; (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; } } /** * Choose the texture sampling function for the given 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]->TexFormat->BaseFormat; switch (t->Target) { case GL_TEXTURE_1D: if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) { 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 || format == GL_DEPTH_STENCIL_EXT) { return &sample_depth_texture; } else if (needLambda) { return &sample_lambda_2d; } else if (t->MinFilter == GL_LINEAR) { return &sample_linear_2d; } else { /* check for a few optimized cases */ const struct gl_texture_image *img = t->Image[0][t->BaseLevel]; ASSERT(t->MinFilter == GL_NEAREST); if (t->WrapS == GL_REPEAT && t->WrapT == GL_REPEAT && img->_IsPowerOfTwo && img->Border == 0 && img->TexFormat->MesaFormat == MESA_FORMAT_RGB) { return &opt_sample_rgb_2d; } else if (t->WrapS == GL_REPEAT && t->WrapT == GL_REPEAT && img->_IsPowerOfTwo && img->Border == 0 && img->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 (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) { return &sample_depth_texture; } else 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; } case GL_TEXTURE_1D_ARRAY_EXT: if (needLambda) { return &sample_lambda_1d_array; } else if (t->MinFilter == GL_LINEAR) { return &sample_linear_1d_array; } else { ASSERT(t->MinFilter == GL_NEAREST); return &sample_nearest_1d_array; } case GL_TEXTURE_2D_ARRAY_EXT: if (needLambda) { return &sample_lambda_2d_array; } else if (t->MinFilter == GL_LINEAR) { return &sample_linear_2d_array; } else { ASSERT(t->MinFilter == GL_NEAREST); return &sample_nearest_2d_array; } default: _mesa_problem(ctx, "invalid target in _swrast_choose_texture_sample_func"); return &null_sample_func; } } }