/* $Id: s_texture.c,v 1.17 2001/03/21 16:04:49 brianp Exp $ */ /* * Mesa 3-D graphics library * Version: 3.5 * * Copyright (C) 1999-2001 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 "mmath.h" #include "mem.h" #include "teximage.h" #include "s_context.h" #include "s_pb.h" #include "s_texture.h" /* * These values are used in the fixed-point arithmetic used * for linear filtering. */ #define WEIGHT_SCALE 65536.0F #define WEIGHT_SHIFT 16 /* * Used to compute texel locations for linear sampling. * Input: * wrapMode = GL_REPEAT, GL_CLAMP or GL_CLAMP_TO_EDGE * S = texcoord in [0,1] * SIZE = width (or height or depth) of texture * Output: * U = texcoord in [0, width] * I0, I1 = two nearest texel indexes */ #define COMPUTE_LINEAR_TEXEL_LOCATIONS(wrapMode, S, U, SIZE, I0, I1) \ { \ if (wrapMode == GL_REPEAT) { \ U = S * SIZE - 0.5F; \ I0 = IFLOOR(U) & (SIZE - 1); \ I1 = (I0 + 1) & (SIZE - 1); \ } \ else { \ if (S <= 0.0F) \ U = 0.0F; \ else if (S >= 1.0F) \ U = SIZE; \ else \ U = S * SIZE; \ U -= 0.5F; \ I0 = IFLOOR(U); \ I1 = I0 + 1; \ if (wrapMode == GL_CLAMP_TO_EDGE) { \ if (I0 < 0) \ I0 = 0; \ if (I1 >= (GLint) SIZE) \ I1 = SIZE - 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,width-1] */ \ I = (GLint) (S * SIZE); \ if (S < 0.0F) \ I -= 1; \ I &= (SIZE - 1); \ } \ else if (wrapMode == GL_CLAMP_TO_EDGE) { \ 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 = (GLint) (S * SIZE); \ } \ else { \ ASSERT(wrapMode == GL_CLAMP); \ /* s limited to [0,1] */ \ /* i limited to [0,width-1] */ \ if (S <= 0.0F) \ I = 0; \ else if (S >= 1.0F) \ I = SIZE - 1; \ else \ I = (GLint) (S * SIZE); \ } \ } /* * Compute linear mipmap levels for given lambda. */ #define COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level) \ { \ if (lambda < 0.0F) \ lambda = 0.0F; \ else if (lambda > tObj->_MaxLambda) \ lambda = tObj->_MaxLambda; \ level = (GLint) (tObj->BaseLevel + lambda); \ } /* * Compute nearest mipmap level for given lambda. */ #define COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level) \ { \ if (lambda <= 0.5F) \ lambda = 0.0F; \ else if (lambda > tObj->_MaxLambda + 0.4999F) \ lambda = tObj->_MaxLambda + 0.4999F; \ level = (GLint) (tObj->BaseLevel + lambda + 0.5F); \ if (level > tObj->_MaxLevel) \ level = tObj->_MaxLevel; \ } /* * Bitflags for texture border color sampling. */ #define I0BIT 1 #define I1BIT 2 #define J0BIT 4 #define J1BIT 8 #define K0BIT 16 #define K1BIT 32 /* * Get texture palette entry. */ static void palette_sample(const GLcontext *ctx, const struct gl_texture_object *tObj, GLint index, GLchan rgba[4] ) { const GLchan *palette; GLenum format; if (ctx->Texture.SharedPalette) { ASSERT(!ctx->Texture.Palette.FloatTable); palette = (const GLchan *) ctx->Texture.Palette.Table; format = ctx->Texture.Palette.Format; } else { ASSERT(!tObj->Palette.FloatTable); palette = (const GLchan *) tObj->Palette.Table; format = tObj->Palette.Format; } switch (format) { case GL_ALPHA: rgba[ACOMP] = palette[index]; return; case GL_LUMINANCE: case GL_INTENSITY: rgba[RCOMP] = palette[index]; return; case GL_LUMINANCE_ALPHA: rgba[RCOMP] = palette[(index << 1) + 0]; rgba[ACOMP] = palette[(index << 1) + 1]; return; case GL_RGB: rgba[RCOMP] = palette[index * 3 + 0]; rgba[GCOMP] = palette[index * 3 + 1]; rgba[BCOMP] = palette[index * 3 + 2]; return; case GL_RGBA: rgba[RCOMP] = palette[(index << 2) + 0]; rgba[GCOMP] = palette[(index << 2) + 1]; rgba[BCOMP] = palette[(index << 2) + 2]; rgba[ACOMP] = palette[(index << 2) + 3]; return; default: _mesa_problem(ctx, "Bad palette format in palette_sample"); } } /**********************************************************************/ /* 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, GLfloat s, GLchan rgba[4]) { const GLint width = img->Width2; /* without border, power of two */ GLint i; COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, s, width, i); /* skip over the border, if any */ i += img->Border; (*img->FetchTexel)(img, i, 0, 0, (GLvoid *) rgba); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, rgba[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, GLfloat s, GLchan rgba[4]) { const GLint width = img->Width2; GLint i0, i1; GLfloat u; GLuint useBorderColor; COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, s, 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); /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ const GLint w0 = IROUND((1.0F-a) * WEIGHT_SCALE); const GLint w1 = IROUND( a * WEIGHT_SCALE); GLchan t0[4], t1[4]; /* texels */ if (useBorderColor & I0BIT) { COPY_CHAN4(t0, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, 0, 0, (GLvoid *) t0); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t0[0], t0); } } if (useBorderColor & I1BIT) { COPY_CHAN4(t1, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, 0, 0, (GLvoid *) t1); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t1[0], t1); } } rgba[0] = (GLchan) ((w0 * t0[0] + w1 * t1[0]) >> WEIGHT_SHIFT); rgba[1] = (GLchan) ((w0 * t0[1] + w1 * t1[1]) >> WEIGHT_SHIFT); rgba[2] = (GLchan) ((w0 * t0[2] + w1 * t1[2]) >> WEIGHT_SHIFT); rgba[3] = (GLchan) ((w0 * t0[3] + w1 * t1[3]) >> WEIGHT_SHIFT); } } static void sample_1d_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); sample_1d_nearest(ctx, tObj, tObj->Image[level], s, rgba); } static void sample_1d_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); sample_1d_linear(ctx, tObj, tObj->Image[level], s, rgba); } static void sample_1d_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); if (level >= tObj->_MaxLevel) { sample_1d_nearest(ctx, tObj, tObj->Image[tObj->_MaxLevel], s, rgba); } else { GLchan t0[4], t1[4]; const GLfloat f = FRAC(lambda); sample_1d_nearest(ctx, tObj, tObj->Image[level ], s, t0); sample_1d_nearest(ctx, tObj, tObj->Image[level+1], s, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]); } } static void sample_1d_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); if (level >= tObj->_MaxLevel) { sample_1d_linear(ctx, tObj, tObj->Image[tObj->_MaxLevel], s, rgba); } else { GLchan t0[4], t1[4]; const GLfloat f = FRAC(lambda); sample_1d_linear(ctx, tObj, tObj->Image[level ], s, t0); sample_1d_linear(ctx, tObj, tObj->Image[level+1], s, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((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 s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4] ) { GLuint i; struct gl_texture_image *image = tObj->Image[tObj->BaseLevel]; (void) t; (void) u; (void) lambda; for (i=0;iImage[tObj->BaseLevel]; (void) t; (void) u; (void) lambda; for (i=0;i_MinMagThresh[texUnit]; GLuint i; (void) t; (void) u; for (i=0;i MinMagThresh) { /* minification */ switch (tObj->MinFilter) { case GL_NEAREST: sample_1d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], rgba[i]); break; case GL_LINEAR: sample_1d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], rgba[i]); break; case GL_NEAREST_MIPMAP_NEAREST: sample_1d_nearest_mipmap_nearest(ctx, tObj, lambda[i], s[i], rgba[i]); break; case GL_LINEAR_MIPMAP_NEAREST: sample_1d_linear_mipmap_nearest(ctx, tObj, s[i], lambda[i], rgba[i]); break; case GL_NEAREST_MIPMAP_LINEAR: sample_1d_nearest_mipmap_linear(ctx, tObj, s[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_LINEAR: sample_1d_linear_mipmap_linear(ctx, tObj, s[i], lambda[i], rgba[i]); break; default: _mesa_problem(NULL, "Bad min filter in sample_1d_texture"); return; } } else { /* magnification */ switch (tObj->MagFilter) { case GL_NEAREST: sample_1d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], rgba[i]); break; case GL_LINEAR: sample_1d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], rgba[i]); break; default: _mesa_problem(NULL, "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 void sample_2d_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, const struct gl_texture_image *img, GLfloat s, GLfloat t, 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; COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, s, width, i); COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, t, height, j); /* skip over the border, if any */ i += img->Border; j += img->Border; (*img->FetchTexel)(img, i, j, 0, (GLvoid *) rgba); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, rgba[0], rgba); } } /* * Return the texture sample for coordinate (s,t) using GL_LINEAR filter. * New sampling code contributed by Lynn Quam . */ static void sample_2d_linear(GLcontext *ctx, const struct gl_texture_object *tObj, const struct gl_texture_image *img, GLfloat s, GLfloat t, GLchan rgba[]) { const GLint width = img->Width2; const GLint height = img->Height2; GLint i0, j0, i1, j1; GLuint useBorderColor; GLfloat u, v; COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, s, u, width, i0, i1); COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, t, 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); /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ const GLint w00 = IROUND((1.0F-a) * (1.0F-b) * WEIGHT_SCALE); const GLint w10 = IROUND( a * (1.0F-b) * WEIGHT_SCALE); const GLint w01 = IROUND((1.0F-a) * b * WEIGHT_SCALE); const GLint w11 = IROUND( a * b * WEIGHT_SCALE); GLchan t00[4]; GLchan t10[4]; GLchan t01[4]; GLchan t11[4]; if (useBorderColor & (I0BIT | J0BIT)) { COPY_CHAN4(t00, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, j0, 0, (GLvoid *) t00); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t00[0], t00); } } if (useBorderColor & (I1BIT | J0BIT)) { COPY_CHAN4(t10, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, j0, 0, (GLvoid *) t10); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t10[0], t10); } } if (useBorderColor & (I0BIT | J1BIT)) { COPY_CHAN4(t01, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, j1, 0, (GLvoid *) t01); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t01[0], t01); } } if (useBorderColor & (I1BIT | J1BIT)) { COPY_CHAN4(t11, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, j1, 0, (GLvoid *) t11); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t11[0], t11); } } rgba[0] = (GLchan) ((w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0]) >> WEIGHT_SHIFT); rgba[1] = (GLchan) ((w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1]) >> WEIGHT_SHIFT); rgba[2] = (GLchan) ((w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2]) >> WEIGHT_SHIFT); rgba[3] = (GLchan) ((w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3]) >> WEIGHT_SHIFT); } } static void sample_2d_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); sample_2d_nearest(ctx, tObj, tObj->Image[level], s, t, rgba); } static void sample_2d_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); sample_2d_linear(ctx, tObj, tObj->Image[level], s, t, rgba); } static void sample_2d_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); if (level >= tObj->_MaxLevel) { sample_2d_nearest(ctx, tObj, tObj->Image[tObj->_MaxLevel], s, t, rgba); } else { GLchan t0[4], t1[4]; /* texels */ const GLfloat f = FRAC(lambda); sample_2d_nearest(ctx, tObj, tObj->Image[level ], s, t, t0); sample_2d_nearest(ctx, tObj, tObj->Image[level+1], s, t, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]); } } static void sample_2d_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); if (level >= tObj->_MaxLevel) { sample_2d_linear(ctx, tObj, tObj->Image[tObj->_MaxLevel], s, t, rgba); } else { GLchan t0[4], t1[4]; /* texels */ const GLfloat f = FRAC(lambda); sample_2d_linear(ctx, tObj, tObj->Image[level ], s, t, t0); sample_2d_linear(ctx, tObj, tObj->Image[level+1], s, t, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((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 s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4] ) { GLuint i; struct gl_texture_image *image = tObj->Image[tObj->BaseLevel]; (void) u; (void) lambda; for (i=0;iImage[tObj->BaseLevel]; (void) u; (void) lambda; for (i=0;i_MinMagThresh[texUnit]; GLuint i; (void) u; /* since lambda is monotonous-array use this check first */ if (lambda[0] <= minMagThresh && lambda[n-1] <= minMagThresh) { /* magnification for whole span */ switch (tObj->MagFilter) { case GL_NEAREST: sample_nearest_2d(ctx, texUnit, tObj, n, s, t, u, lambda, rgba); break; case GL_LINEAR: sample_linear_2d(ctx, texUnit, tObj, n, s, t, u, lambda, rgba); break; default: _mesa_problem(NULL, "Bad mag filter in sample_lambda_2d"); } } else { for (i = 0; i < n; i++) { if (lambda[i] > minMagThresh) { /* minification */ switch (tObj->MinFilter) { case GL_NEAREST: sample_2d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], rgba[i]); break; case GL_LINEAR: sample_2d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], rgba[i]); break; case GL_NEAREST_MIPMAP_NEAREST: sample_2d_nearest_mipmap_nearest(ctx, tObj, s[i], t[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_NEAREST: sample_2d_linear_mipmap_nearest(ctx,tObj, s[i], t[i], lambda[i], rgba[i]); break; case GL_NEAREST_MIPMAP_LINEAR: sample_2d_nearest_mipmap_linear(ctx,tObj, s[i], t[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_LINEAR: sample_2d_linear_mipmap_linear(ctx,tObj, s[i], t[i], lambda[i], rgba[i] ); break; default: _mesa_problem(NULL, "Bad min filter in sample_2d_texture"); return; } } else { /* magnification */ switch (tObj->MagFilter) { case GL_NEAREST: sample_2d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], rgba[i]); break; case GL_LINEAR: sample_2d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], rgba[i] ); break; default: _mesa_problem(NULL, "Bad mag filter in sample_2d_texture"); } } } } } /* * Optimized 2-D texture sampling: * S and T wrap mode == GL_REPEAT * GL_NEAREST min/mag filter * No border * Format = GL_RGB */ static void opt_sample_rgb_2d( GLcontext *ctx, GLuint texUnit, const struct gl_texture_object *tObj, GLuint n, const GLfloat s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4] ) { const struct gl_texture_image *img = tObj->Image[tObj->BaseLevel]; const GLfloat width = (GLfloat) img->Width; const GLfloat height = (GLfloat) img->Height; const GLint colMask = img->Width - 1; const GLint rowMask = img->Height - 1; const GLint shift = img->WidthLog2; GLuint k; (void) u; (void) lambda; ASSERT(tObj->WrapS==GL_REPEAT); ASSERT(tObj->WrapT==GL_REPEAT); ASSERT(tObj->MinFilter==GL_NEAREST); ASSERT(tObj->MagFilter==GL_NEAREST); ASSERT(img->Border==0); ASSERT(img->Format==GL_RGB); /* NOTE: negative float->int doesn't floor, add 10000 as to work-around */ for (k=0;kData) + pos + pos + pos; /* pos*3 */ 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 * Format = GL_RGBA */ static void opt_sample_rgba_2d( GLcontext *ctx, GLuint texUnit, const struct gl_texture_object *tObj, GLuint n, const GLfloat s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4] ) { const struct gl_texture_image *img = tObj->Image[tObj->BaseLevel]; const GLfloat width = (GLfloat) img->Width; const GLfloat height = (GLfloat) img->Height; const GLint colMask = img->Width - 1; const GLint rowMask = img->Height - 1; const GLint shift = img->WidthLog2; GLuint k; (void) u; (void) lambda; ASSERT(tObj->WrapS==GL_REPEAT); ASSERT(tObj->WrapT==GL_REPEAT); ASSERT(tObj->MinFilter==GL_NEAREST); ASSERT(tObj->MagFilter==GL_NEAREST); ASSERT(img->Border==0); ASSERT(img->Format==GL_RGBA); /* NOTE: negative float->int doesn't floor, add 10000 as to work-around */ for (k=0;kData) + (pos << 2); /* pos*4 */ rgba[k][RCOMP] = texel[0]; rgba[k][GCOMP] = texel[1]; rgba[k][BCOMP] = texel[2]; rgba[k][ACOMP] = texel[3]; } } /**********************************************************************/ /* 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, GLfloat s, GLfloat t, GLfloat r, GLchan rgba[4]) { const GLint width = img->Width2; /* without border, power of two */ const GLint height = img->Height2; /* without border, power of two */ const GLint depth = img->Depth2; /* without border, power of two */ GLint i, j, k; COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, s, width, i); COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, t, height, j); COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapR, r, depth, k); (*img->FetchTexel)(img, i, j, k, (GLvoid *) rgba); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, rgba[0], rgba); } } /* * Return the texture sample for coordinate (s,t,r) using GL_LINEAR filter. */ static void sample_3d_linear(GLcontext *ctx, const struct gl_texture_object *tObj, const struct gl_texture_image *img, GLfloat s, GLfloat t, GLfloat r, GLchan rgba[4]) { const GLint width = img->Width2; const GLint height = img->Height2; const GLint depth = img->Depth2; GLint i0, j0, k0, i1, j1, k1; GLuint useBorderColor; GLfloat u, v, w; COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, s, u, width, i0, i1); COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, t, v, height, j0, j1); COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapR, r, 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); /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ GLint w000 = IROUND((1.0F-a) * (1.0F-b) * (1.0F-c) * WEIGHT_SCALE); GLint w100 = IROUND( a * (1.0F-b) * (1.0F-c) * WEIGHT_SCALE); GLint w010 = IROUND((1.0F-a) * b * (1.0F-c) * WEIGHT_SCALE); GLint w110 = IROUND( a * b * (1.0F-c) * WEIGHT_SCALE); GLint w001 = IROUND((1.0F-a) * (1.0F-b) * c * WEIGHT_SCALE); GLint w101 = IROUND( a * (1.0F-b) * c * WEIGHT_SCALE); GLint w011 = IROUND((1.0F-a) * b * c * WEIGHT_SCALE); GLint w111 = IROUND( a * b * c * WEIGHT_SCALE); GLchan t000[4], t010[4], t001[4], t011[4]; GLchan t100[4], t110[4], t101[4], t111[4]; if (useBorderColor & (I0BIT | J0BIT | K0BIT)) { COPY_CHAN4(t000, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, j0, k0, (GLvoid *) t000); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t000[0], t000); } } if (useBorderColor & (I1BIT | J0BIT | K0BIT)) { COPY_CHAN4(t100, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, j0, k0, (GLvoid *) t100); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t100[0], t100); } } if (useBorderColor & (I0BIT | J1BIT | K0BIT)) { COPY_CHAN4(t010, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, j1, k0, (GLvoid *) t010); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t010[0], t010); } } if (useBorderColor & (I1BIT | J1BIT | K0BIT)) { COPY_CHAN4(t110, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, j1, k0, (GLvoid *) t110); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t110[0], t110); } } if (useBorderColor & (I0BIT | J0BIT | K1BIT)) { COPY_CHAN4(t001, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, j0, k1, (GLvoid *) t001); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t001[0], t001); } } if (useBorderColor & (I1BIT | J0BIT | K1BIT)) { COPY_CHAN4(t101, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, j0, k1, (GLvoid *) t101); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t101[0], t101); } } if (useBorderColor & (I0BIT | J1BIT | K1BIT)) { COPY_CHAN4(t011, tObj->BorderColor); } else { (*img->FetchTexel)(img, i0, j1, k1, (GLvoid *) t011); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t011[0], t011); } } if (useBorderColor & (I1BIT | J1BIT | K1BIT)) { COPY_CHAN4(t111, tObj->BorderColor); } else { (*img->FetchTexel)(img, i1, j1, k1, (GLvoid *) t111); if (img->Format == GL_COLOR_INDEX) { palette_sample(ctx, tObj, t111[0], t111); } } rgba[0] = (GLchan) ( (w000*t000[0] + w010*t010[0] + w001*t001[0] + w011*t011[0] + w100*t100[0] + w110*t110[0] + w101*t101[0] + w111*t111[0] ) >> WEIGHT_SHIFT); rgba[1] = (GLchan) ( (w000*t000[1] + w010*t010[1] + w001*t001[1] + w011*t011[1] + w100*t100[1] + w110*t110[1] + w101*t101[1] + w111*t111[1] ) >> WEIGHT_SHIFT); rgba[2] = (GLchan) ( (w000*t000[2] + w010*t010[2] + w001*t001[2] + w011*t011[2] + w100*t100[2] + w110*t110[2] + w101*t101[2] + w111*t111[2] ) >> WEIGHT_SHIFT); rgba[3] = (GLchan) ( (w000*t000[3] + w010*t010[3] + w001*t001[3] + w011*t011[3] + w100*t100[3] + w110*t110[3] + w101*t101[3] + w111*t111[3] ) >> WEIGHT_SHIFT); } } static void sample_3d_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat r, GLfloat lambda, GLchan rgba[4] ) { GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); sample_3d_nearest(ctx, tObj, tObj->Image[level], s, t, r, rgba); } static void sample_3d_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat r, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); sample_3d_linear(ctx, tObj, tObj->Image[level], s, t, r, rgba); } static void sample_3d_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat r, GLfloat lambda, GLchan rgba[4]) { GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); if (level >= tObj->_MaxLevel) { sample_3d_nearest(ctx, tObj, tObj->Image[tObj->_MaxLevel], s, t, r, rgba); } else { GLchan t0[4], t1[4]; /* texels */ const GLfloat f = FRAC(lambda); sample_3d_nearest(ctx, tObj, tObj->Image[level ], s, t, r, t0); sample_3d_nearest(ctx, tObj, tObj->Image[level+1], s, t, r, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]); } } static void sample_3d_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat r, GLfloat lambda, GLchan rgba[4] ) { GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); if (level >= tObj->_MaxLevel) { sample_3d_linear(ctx, tObj, tObj->Image[tObj->_MaxLevel], s, t, r, rgba); } else { GLchan t0[4], t1[4]; /* texels */ const GLfloat f = FRAC(lambda); sample_3d_linear(ctx, tObj, tObj->Image[level ], s, t, r, t0); sample_3d_linear(ctx, tObj, tObj->Image[level+1], s, t, r, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((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 s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; struct gl_texture_image *image = tObj->Image[tObj->BaseLevel]; (void) lambda; for (i=0;iImage[tObj->BaseLevel]; (void) lambda; for (i=0;i_MinMagThresh[texUnit]; for (i=0;i MinMagThresh) { /* minification */ switch (tObj->MinFilter) { case GL_NEAREST: sample_3d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], u[i], rgba[i]); break; case GL_LINEAR: sample_3d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], u[i], rgba[i]); break; case GL_NEAREST_MIPMAP_NEAREST: sample_3d_nearest_mipmap_nearest(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_NEAREST: sample_3d_linear_mipmap_nearest(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; case GL_NEAREST_MIPMAP_LINEAR: sample_3d_nearest_mipmap_linear(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_LINEAR: sample_3d_linear_mipmap_linear(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; default: _mesa_problem(NULL, "Bad min filterin sample_3d_texture"); } } else { /* magnification */ switch (tObj->MagFilter) { case GL_NEAREST: sample_3d_nearest(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], u[i], rgba[i]); break; case GL_LINEAR: sample_3d_linear(ctx, tObj, tObj->Image[tObj->BaseLevel], s[i], t[i], u[i], rgba[i]); break; default: _mesa_problem(NULL, "Bad mag filter in sample_3d_texture"); } } } } /**********************************************************************/ /* 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, GLfloat rx, GLfloat ry, GLfloat rz, GLfloat *newS, GLfloat *newT) { /* 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 struct gl_texture_image **imgArray; const GLfloat arx = ABSF(rx), ary = ABSF(ry), arz = ABSF(rz); GLfloat sc, tc, ma; if (arx > ary && arx > arz) { if (rx >= 0.0F) { imgArray = (const struct gl_texture_image **) texObj->Image; sc = -rz; tc = -ry; ma = arx; } else { imgArray = (const struct gl_texture_image **) texObj->NegX; sc = rz; tc = -ry; ma = arx; } } else if (ary > arx && ary > arz) { if (ry >= 0.0F) { imgArray = (const struct gl_texture_image **) texObj->PosY; sc = rx; tc = rz; ma = ary; } else { imgArray = (const struct gl_texture_image **) texObj->NegY; sc = rx; tc = -rz; ma = ary; } } else { if (rz > 0.0F) { imgArray = (const struct gl_texture_image **) texObj->PosZ; sc = rx; tc = -ry; ma = arz; } else { imgArray = (const struct gl_texture_image **) texObj->NegZ; sc = -rx; tc = -ry; ma = arz; } } *newS = ( sc / ma + 1.0F ) * 0.5F; *newT = ( 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 s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; (void) lambda; for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newS, newT; images = choose_cube_face(tObj, s[i], t[i], u[i], &newS, &newT); sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel], newS, newT, rgba[i]); } } static void sample_linear_cube(GLcontext *ctx, GLuint texUnit, const struct gl_texture_object *tObj, GLuint n, const GLfloat s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4]) { GLuint i; (void) lambda; for (i = 0; i < n; i++) { const struct gl_texture_image **images; GLfloat newS, newT; images = choose_cube_face(tObj, s[i], t[i], u[i], &newS, &newT); sample_2d_linear(ctx, tObj, images[tObj->BaseLevel], newS, newT, rgba[i]); } } static void sample_cube_nearest_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat u, GLfloat lambda, GLchan rgba[4]) { const struct gl_texture_image **images; GLfloat newS, newT; GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); images = choose_cube_face(tObj, s, t, u, &newS, &newT); sample_2d_nearest(ctx, tObj, images[level], newS, newT, rgba); } static void sample_cube_linear_mipmap_nearest(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat u, GLfloat lambda, GLchan rgba[4]) { const struct gl_texture_image **images; GLfloat newS, newT; GLint level; COMPUTE_NEAREST_MIPMAP_LEVEL(tObj, lambda, level); images = choose_cube_face(tObj, s, t, u, &newS, &newT); sample_2d_linear(ctx, tObj, images[level], newS, newT, rgba); } static void sample_cube_nearest_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat u, GLfloat lambda, GLchan rgba[4]) { const struct gl_texture_image **images; GLfloat newS, newT; GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); images = choose_cube_face(tObj, s, t, u, &newS, &newT); if (level >= tObj->_MaxLevel) { sample_2d_nearest(ctx, tObj, images[tObj->_MaxLevel], newS, newT, rgba); } else { GLchan t0[4], t1[4]; /* texels */ const GLfloat f = FRAC(lambda); sample_2d_nearest(ctx, tObj, images[level ], newS, newT, t0); sample_2d_nearest(ctx, tObj, images[level+1], newS, newT, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]); } } static void sample_cube_linear_mipmap_linear(GLcontext *ctx, const struct gl_texture_object *tObj, GLfloat s, GLfloat t, GLfloat u, GLfloat lambda, GLchan rgba[4]) { const struct gl_texture_image **images; GLfloat newS, newT; GLint level; COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda, level); images = choose_cube_face(tObj, s, t, u, &newS, &newT); if (level >= tObj->_MaxLevel) { sample_2d_linear(ctx, tObj, images[tObj->_MaxLevel], newS, newT, rgba); } else { GLchan t0[4], t1[4]; const GLfloat f = FRAC(lambda); sample_2d_linear(ctx, tObj, images[level ], newS, newT, t0); sample_2d_linear(ctx, tObj, images[level+1], newS, newT, t1); rgba[RCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]); rgba[GCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]); rgba[BCOMP] = (GLchan) (GLint) ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]); rgba[ACOMP] = (GLchan) (GLint) ((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 s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4]) { GLfloat MinMagThresh = SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit]; GLuint i; for (i = 0; i < n; i++) { if (lambda[i] > MinMagThresh) { /* minification */ switch (tObj->MinFilter) { case GL_NEAREST: { const struct gl_texture_image **images; GLfloat newS, newT; images = choose_cube_face(tObj, s[i], t[i], u[i], &newS, &newT); sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel], newS, newT, rgba[i]); } break; case GL_LINEAR: { const struct gl_texture_image **images; GLfloat newS, newT; images = choose_cube_face(tObj, s[i], t[i], u[i], &newS, &newT); sample_2d_linear(ctx, tObj, images[tObj->BaseLevel], newS, newT, rgba[i]); } break; case GL_NEAREST_MIPMAP_NEAREST: sample_cube_nearest_mipmap_nearest(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_NEAREST: sample_cube_linear_mipmap_nearest(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; case GL_NEAREST_MIPMAP_LINEAR: sample_cube_nearest_mipmap_linear(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; case GL_LINEAR_MIPMAP_LINEAR: sample_cube_linear_mipmap_linear(ctx, tObj, s[i], t[i], u[i], lambda[i], rgba[i]); break; default: _mesa_problem(NULL, "Bad min filter in sample_lambda_cube"); } } else { /* magnification */ const struct gl_texture_image **images; GLfloat newS, newT; images = choose_cube_face(tObj, s[i], t[i], u[i], &newS, &newT); switch (tObj->MagFilter) { case GL_NEAREST: sample_2d_nearest(ctx, tObj, images[tObj->BaseLevel], newS, newT, rgba[i]); break; case GL_LINEAR: sample_2d_linear(ctx, tObj, images[tObj->BaseLevel], newS, newT, rgba[i]); break; default: _mesa_problem(NULL, "Bad mag filter in sample_lambda_cube"); } } } } static void null_sample_func( GLcontext *ctx, GLuint texUnit, const struct gl_texture_object *tObj, GLuint n, const GLfloat s[], const GLfloat t[], const GLfloat u[], const GLfloat lambda[], GLchan rgba[][4]) { } /**********************************************************************/ /* Texture Sampling Setup */ /**********************************************************************/ /* * Setup the texture sampling function for this texture object. */ void _swrast_choose_texture_sample_func( GLcontext *ctx, GLuint texUnit, const struct gl_texture_object *t ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (!t->Complete) { swrast->TextureSample[texUnit] = null_sample_func; } else { GLboolean needLambda = (GLboolean) (t->MinFilter != t->MagFilter); if (needLambda) { /* Compute min/mag filter threshold */ if (t->MagFilter == GL_LINEAR && (t->MinFilter == GL_NEAREST_MIPMAP_NEAREST || t->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) { swrast->_MinMagThresh[texUnit] = 0.5F; } else { swrast->_MinMagThresh[texUnit] = 0.0F; } } switch (t->Dimensions) { case 1: if (needLambda) { swrast->TextureSample[texUnit] = sample_lambda_1d; } else if (t->MinFilter==GL_LINEAR) { swrast->TextureSample[texUnit] = sample_linear_1d; } else { ASSERT(t->MinFilter==GL_NEAREST); swrast->TextureSample[texUnit] = sample_nearest_1d; } break; case 2: if (needLambda) { swrast->TextureSample[texUnit] = sample_lambda_2d; } else if (t->MinFilter==GL_LINEAR) { swrast->TextureSample[texUnit] = sample_linear_2d; } else { GLint baseLevel = t->BaseLevel; ASSERT(t->MinFilter==GL_NEAREST); if (t->WrapS == GL_REPEAT && t->WrapT == GL_REPEAT && t->Image[baseLevel]->Border == 0 && t->Image[baseLevel]->Format == GL_RGB && t->Image[baseLevel]->Type == CHAN_TYPE) { swrast->TextureSample[texUnit] = opt_sample_rgb_2d; } else if (t->WrapS == GL_REPEAT && t->WrapT == GL_REPEAT && t->Image[baseLevel]->Border == 0 && t->Image[baseLevel]->Format==GL_RGBA && t->Image[baseLevel]->Type == CHAN_TYPE) { swrast->TextureSample[texUnit] = opt_sample_rgba_2d; } else swrast->TextureSample[texUnit] = sample_nearest_2d; } break; case 3: if (needLambda) { swrast->TextureSample[texUnit] = sample_lambda_3d; } else if (t->MinFilter==GL_LINEAR) { swrast->TextureSample[texUnit] = sample_linear_3d; } else { ASSERT(t->MinFilter==GL_NEAREST); swrast->TextureSample[texUnit] = sample_nearest_3d; } break; case 6: /* cube map */ if (needLambda) { swrast->TextureSample[texUnit] = sample_lambda_cube; } else if (t->MinFilter==GL_LINEAR) { swrast->TextureSample[texUnit] = sample_linear_cube; } else { ASSERT(t->MinFilter==GL_NEAREST); swrast->TextureSample[texUnit] = sample_nearest_cube; } break; default: _mesa_problem(NULL, "invalid dimensions in _mesa_set_texture_sampler"); } } } #define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) ) #define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) ) static INLINE void texture_combine(const GLcontext *ctx, const struct gl_texture_unit *textureUnit, GLuint n, CONST GLchan (*primary_rgba)[4], CONST GLchan (*texel)[4], GLchan (*rgba)[4]) { GLchan ccolor [3][3*MAX_WIDTH][4]; const GLchan (*argRGB [3])[4]; const GLchan (*argA [3])[4]; GLuint i, j; const GLuint RGBshift = textureUnit->CombineScaleShiftRGB; const GLuint Ashift = textureUnit->CombineScaleShiftA; ASSERT(ctx->Extensions.EXT_texture_env_combine); for (j = 0; j < 3; j++) { switch (textureUnit->CombineSourceA[j]) { case GL_TEXTURE: argA[j] = texel; break; case GL_PRIMARY_COLOR_EXT: argA[j] = primary_rgba; break; case GL_PREVIOUS_EXT: argA[j] = (const GLchan (*)[4]) rgba; break; case GL_CONSTANT_EXT: { GLchan alpha, (*c)[4] = ccolor[j]; UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]); for (i = 0; i < n; i++) c[i][ACOMP] = alpha; argA[j] = (const GLchan (*)[4]) ccolor[j]; } break; default: _mesa_problem(NULL, "invalid combine source"); } switch (textureUnit->CombineSourceRGB[j]) { case GL_TEXTURE: argRGB[j] = texel; break; case GL_PRIMARY_COLOR_EXT: argRGB[j] = primary_rgba; break; case GL_PREVIOUS_EXT: argRGB[j] = (const GLchan (*)[4]) rgba; break; case GL_CONSTANT_EXT: { GLchan (*c)[4] = ccolor[j]; GLchan red, green, blue; UNCLAMPED_FLOAT_TO_CHAN(red, textureUnit->EnvColor[0]); UNCLAMPED_FLOAT_TO_CHAN(green, textureUnit->EnvColor[1]); UNCLAMPED_FLOAT_TO_CHAN(blue, textureUnit->EnvColor[2]); for (i = 0; i < n; i++) { c[i][RCOMP] = red; c[i][GCOMP] = green; c[i][BCOMP] = blue; } argRGB[j] = (const GLchan (*)[4]) ccolor[j]; } break; default: _mesa_problem(NULL, "invalid combine source"); } if (textureUnit->CombineOperandRGB[j] != GL_SRC_COLOR) { const GLchan (*src)[4] = argRGB[j]; GLchan (*dst)[4] = ccolor[j]; argRGB[j] = (const GLchan (*)[4]) ccolor[j]; if (textureUnit->CombineOperandRGB[j] == GL_ONE_MINUS_SRC_COLOR) { for (i = 0; i < n; i++) { dst[i][RCOMP] = CHAN_MAX - src[i][RCOMP]; dst[i][GCOMP] = CHAN_MAX - src[i][GCOMP]; dst[i][BCOMP] = CHAN_MAX - src[i][BCOMP]; } } else if (textureUnit->CombineOperandRGB[j] == GL_SRC_ALPHA) { src = (const GLchan (*)[4]) argA[j]; 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 { /* GL_ONE_MINUS_SRC_ALPHA */ src = (const GLchan (*)[4]) argA[j]; for (i = 0; i < n; i++) { dst[i][RCOMP] = CHAN_MAX - src[i][ACOMP]; dst[i][GCOMP] = CHAN_MAX - src[i][ACOMP]; dst[i][BCOMP] = CHAN_MAX - src[i][ACOMP]; } } } if (textureUnit->CombineOperandA[j] == GL_ONE_MINUS_SRC_ALPHA) { const GLchan (*src)[4] = argA[j]; GLchan (*dst)[4] = ccolor[j]; argA[j] = (const GLchan (*)[4]) ccolor[j]; for (i = 0; i < n; i++) { dst[i][ACOMP] = CHAN_MAX - src[i][ACOMP]; } } if (textureUnit->CombineModeRGB == GL_REPLACE && textureUnit->CombineModeA == GL_REPLACE) { break; /* done, we need only arg0 */ } if (j == 1 && textureUnit->CombineModeRGB != GL_INTERPOLATE_EXT && textureUnit->CombineModeA != GL_INTERPOLATE_EXT) { break; /* arg0 and arg1 are done. we don't need arg2. */ } } switch (textureUnit->CombineModeRGB) { case GL_REPLACE: { const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; if (RGBshift) { for (i = 0; i < n; i++) { 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); } } 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]; const GLint shift = 8 - RGBshift; for (i = 0; i < n; i++) { GLuint r = PROD(arg0[i][0], arg1[i][RCOMP]) >> shift; GLuint g = PROD(arg0[i][1], arg1[i][GCOMP]) >> shift; GLuint b = PROD(arg0[i][2], 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); } } 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++) { 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); } } break; case GL_ADD_SIGNED_EXT: { const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; for (i = 0; i < n; i++) { GLint r = (GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP] - 128; GLint g = (GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP] - 128; GLint b = (GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP] - 128; 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); } } break; case GL_INTERPOLATE_EXT: { const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2]; const GLint shift = 8 - RGBshift; for (i = 0; i < n; i++) { 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); } } break; case GL_DOT3_RGB_EXT: case GL_DOT3_RGBA_EXT: { const GLubyte (*arg0)[4] = (const GLubyte (*)[4]) argRGB[0]; const GLubyte (*arg1)[4] = (const GLubyte (*)[4]) argRGB[1]; /* ATI's EXT extension has a constant scale by 4. The ARB * one will likely remove this restriction, and we should * drop the EXT extension in favour of the ARB one. */ for (i = 0; i < n; i++) { GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - 128, (GLint)arg1[i][RCOMP] - 128) + S_PROD((GLint)arg0[i][GCOMP] - 128, (GLint)arg1[i][GCOMP] - 128) + S_PROD((GLint)arg0[i][BCOMP] - 128, (GLint)arg1[i][BCOMP] - 128)) >> 6; rgba[i][RCOMP] = (GLubyte) CLAMP(dot, 0, 255); rgba[i][GCOMP] = (GLubyte) CLAMP(dot, 0, 255); rgba[i][BCOMP] = (GLubyte) CLAMP(dot, 0, 255); } } break; default: _mesa_problem(NULL, "invalid combine mode"); } switch (textureUnit->CombineModeA) { case GL_REPLACE: { const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; if (Ashift) { for (i = 0; i < n; i++) { GLuint a = (GLuint) arg0[i][ACOMP] << Ashift; 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]; const GLint shift = 8 - Ashift; for (i = 0; i < n; i++) { GLuint a = (PROD(arg0[i][ACOMP], arg1[i][ACOMP]) >> shift); rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); } } 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++) { GLint a = ((GLint) arg0[i][ACOMP] + arg1[i][ACOMP]) << Ashift; rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); } } break; case GL_ADD_SIGNED_EXT: { const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; for (i = 0; i < n; i++) { GLint a = (GLint) arg0[i][ACOMP] + (GLint) arg1[i][ACOMP] - 128; a = (a < 0) ? 0 : a << Ashift; rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); } } break; case GL_INTERPOLATE_EXT: { const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2]; const GLint shift = 8 - Ashift; for (i=0; i> shift; rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); } } break; default: _mesa_problem(NULL, "invalid combine mode"); } /* Fix the alpha component for GL_DOT3_RGBA_EXT combining. */ if (textureUnit->CombineModeRGB == GL_DOT3_RGBA_EXT) { for (i = 0; i < n; i++) { rgba[i][ACOMP] = rgba[i][RCOMP]; } } } #undef PROD /**********************************************************************/ /* Texture Application */ /**********************************************************************/ /* * Combine incoming fragment color with texel color to produce output color. * 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 apply_texture( const GLcontext *ctx, const struct gl_texture_unit *texUnit, GLuint n, CONST GLchan primary_rgba[][4], CONST GLchan texel[][4], GLchan rgba[][4] ) { GLint baseLevel; GLuint i; GLint Rc, Gc, Bc, Ac; GLenum format; ASSERT(texUnit); ASSERT(texUnit->_Current); baseLevel = texUnit->_Current->BaseLevel; ASSERT(texUnit->_Current->Image[baseLevel]); format = texUnit->_Current->Image[baseLevel]->Format; if (format==GL_COLOR_INDEX || format==GL_DEPTH_COMPONENT) { format = GL_RGBA; /* XXXX a hack! */ } switch (texUnit->EnvMode) { case GL_REPLACE: switch (format) { case GL_ALPHA: for (i=0;iEnvColor[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_Current; const GLint baseLevel = texObj->BaseLevel; const struct gl_texture_image *texImage = texObj->Image[baseLevel]; const GLuint width = texImage->Width; const GLuint height = texImage->Height; const GLchan ambient = texObj->ShadowAmbient; GLboolean lequal, gequal; if (texObj->Dimensions != 2) { _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; } if (texObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) { lequal = GL_TRUE; gequal = GL_FALSE; } else { lequal = GL_FALSE; gequal = GL_TRUE; } if (texObj->MagFilter == GL_NEAREST) { GLuint i; for (i = 0; i < n; i++) { GLfloat depthSample; GLint col, row; COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapS, s[i], width, col); COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapT, t[i], height, row); depthSample = *((const GLfloat *) texImage->Data + row * width + col); if ((r[i] <= depthSample && lequal) || (r[i] >= depthSample && gequal)) { texel[i][RCOMP] = CHAN_MAX; texel[i][GCOMP] = CHAN_MAX; texel[i][BCOMP] = CHAN_MAX; texel[i][ACOMP] = CHAN_MAX; } else { texel[i][RCOMP] = ambient; texel[i][GCOMP] = ambient; texel[i][BCOMP] = ambient; texel[i][ACOMP] = CHAN_MAX; } } } else { GLuint i; ASSERT(texObj->MagFilter == GL_LINEAR); for (i = 0; i < n; i++) { GLfloat depth00, depth01, depth10, depth11; GLint i0, i1, j0, j1; GLfloat u, v; GLuint useBorderTexel; COMPUTE_LINEAR_TEXEL_LOCATIONS(texObj->WrapS, s[i], u, width, i0, i1); COMPUTE_LINEAR_TEXEL_LOCATIONS(texObj->WrapT, t[i], v, height,j0, j1); useBorderTexel = 0; if (texImage->Border) { i0 += texImage->Border; i1 += texImage->Border; j0 += texImage->Border; j1 += texImage->Border; } else { if (i0 < 0 || i0 >= (GLint) width) useBorderTexel |= I0BIT; if (i1 < 0 || i1 >= (GLint) width) useBorderTexel |= I1BIT; if (j0 < 0 || j0 >= (GLint) height) useBorderTexel |= J0BIT; if (j1 < 0 || j1 >= (GLint) height) useBorderTexel |= J1BIT; } /* get four depth samples from the texture */ if (useBorderTexel & (I0BIT | J0BIT)) { depth00 = 1.0; } else { depth00 = *((const GLfloat *) texImage->Data + j0 * width + i0); } if (useBorderTexel & (I1BIT | J0BIT)) { depth10 = 1.0; } else { depth10 = *((const GLfloat *) texImage->Data + j0 * width + i1); } if (useBorderTexel & (I0BIT | J1BIT)) { depth01 = 1.0; } else { depth01 = *((const GLfloat *) texImage->Data + j1 * width + i0); } if (useBorderTexel & (I1BIT | J1BIT)) { depth11 = 1.0; } else { depth11 = *((const GLfloat *) texImage->Data + j1 * width + i1); } if (0) { /* compute a single weighted depth sample and do one comparison */ const GLfloat a = FRAC(u); const GLfloat b = FRAC(v); const GLfloat w00 = (1.0F - a) * (1.0F - b); const GLfloat w10 = ( a) * (1.0F - b); const GLfloat w01 = (1.0F - a) * ( b); const GLfloat w11 = ( a) * ( b); const GLfloat depthSample = w00 * depth00 + w10 * depth10 + w01 * depth01 + w11 * depth11; if ((depthSample <= r[i] && lequal) || (depthSample >= r[i] && gequal)) { texel[i][RCOMP] = ambient; texel[i][GCOMP] = ambient; texel[i][BCOMP] = ambient; texel[i][ACOMP] = CHAN_MAX; } else { texel[i][RCOMP] = CHAN_MAX; texel[i][GCOMP] = CHAN_MAX; texel[i][BCOMP] = CHAN_MAX; texel[i][ACOMP] = 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; GLchan lum; if (lequal) { if (depth00 <= r[i]) luminance -= d; if (depth01 <= r[i]) luminance -= d; if (depth10 <= r[i]) luminance -= d; if (depth11 <= r[i]) luminance -= d; } else { if (depth00 >= r[i]) luminance -= d; if (depth01 >= r[i]) luminance -= d; if (depth10 >= r[i]) luminance -= d; if (depth11 >= r[i]) luminance -= d; } lum = (GLchan) luminance; texel[i][RCOMP] = lum; texel[i][GCOMP] = lum; texel[i][BCOMP] = lum; texel[i][ACOMP] = CHAN_MAX; } } } } #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 s[], const GLfloat t[], const GLfloat r[], GLchan texel[][4]) { const struct gl_texture_object *texObj = texUnit->_Current; const GLint baseLevel = texObj->BaseLevel; const struct gl_texture_image *texImage = texObj->Image[baseLevel]; const GLuint width = texImage->Width; const GLuint height = texImage->Height; const GLchan ambient = texObj->ShadowAmbient; GLboolean lequal, gequal; if (texObj->Dimensions != 2) { _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; } 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, s[i], width, col); COMPUTE_NEAREST_TEXEL_LOCATION(texObj->WrapT, t[i], height, row); imin = col - K; imax = col + K; jmin = row - K; jmax = row + K; if (imin < 0) imin = 0; if (imax >= width) imax = width - 1; if (jmin < 0) jmin = 0; if (jmax >= height) jmax = height - 1; samples = (imax - imin + 1) * (jmax - jmin + 1); count = 0; for (jj = jmin; jj <= jmax; jj++) { for (ii = imin; ii <= imax; ii++) { GLfloat depthSample = *((const GLfloat *) texImage->Data + jj * width + ii); if ((depthSample <= r[i] && lequal) || (depthSample >= r[i] && gequal)) { count++; } } } w = (GLfloat) count / (GLfloat) samples; w = CHAN_MAXF - w * (CHAN_MAXF - (GLfloat) ambient); lum = (GLint) w; texel[i][RCOMP] = lum; texel[i][GCOMP] = lum; texel[i][BCOMP] = lum; texel[i][ACOMP] = CHAN_MAX; } } } #endif /* * Apply a unit of texture mapping to the incoming fragments. */ void _swrast_texture_fragments( GLcontext *ctx, GLuint texUnit, GLuint n, const GLfloat s[], const GLfloat t[], const GLfloat r[], GLfloat lambda[], CONST GLchan primary_rgba[][4], GLchan rgba[][4] ) { const GLuint mask = TEXTURE0_ANY << (texUnit * 4); if (ctx->Texture._ReallyEnabled & mask) { const struct gl_texture_unit *textureUnit = &ctx->Texture.Unit[texUnit]; if (textureUnit->_Current) { /* XXX need this? */ GLchan texel[PB_SIZE][4]; if (textureUnit->LodBias != 0.0F) { /* apply LOD bias, but don't clamp yet */ GLuint i; for (i=0;iLodBias; } } if (textureUnit->_Current->MinLod != -1000.0 || textureUnit->_Current->MaxLod != 1000.0) { /* apply LOD clamping to lambda */ const GLfloat min = textureUnit->_Current->MinLod; const GLfloat max = textureUnit->_Current->MaxLod; GLuint i; for (i=0;i_Current->CompareFlag) { /* depth texture */ sample_depth_texture(ctx, textureUnit, n, s, t, r, texel); } else { /* color texture */ SWRAST_CONTEXT(ctx)->TextureSample[texUnit]( ctx, texUnit, textureUnit->_Current, n, s, t, r, lambda, texel ); } apply_texture( ctx, textureUnit, n, primary_rgba, (const GLchan (*)[4]) texel, rgba ); } } }