diff options
| -rw-r--r-- | src/mesa/swrast/s_texfilter.c | 533 |
1 files changed, 271 insertions, 262 deletions
diff --git a/src/mesa/swrast/s_texfilter.c b/src/mesa/swrast/s_texfilter.c index b76de045f82..6e4144823ad 100644 --- a/src/mesa/swrast/s_texfilter.c +++ b/src/mesa/swrast/s_texfilter.c @@ -456,6 +456,168 @@ linear_repeat_texel_location(GLuint size, GLfloat s, /** + * 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; + default: + _mesa_problem(NULL, "bad wrapMode in clamp_rect_coord_linear"); + i0 = i1 = 0; + fcol = 0.0F; + } + *i0out = i0; + *i1out = i1; + *weight = FRAC(fcol); +} + + +/** + * Compute nearest integer texcoords for given texobj and coordinate. + */ +static INLINE void +nearest_texcoord(const struct gl_texture_object *texObj, + const GLfloat texcoord[4], + GLint *i, GLint *j, GLint *k) +{ + const GLint baseLevel = texObj->BaseLevel; + const struct gl_texture_image *img = texObj->Image[0][baseLevel]; + const GLint width = img->Width; + const GLint height = img->Height; + const GLint depth = img->Depth; + + switch (texObj->Target) { + case GL_TEXTURE_RECTANGLE_ARB: + *i = clamp_rect_coord_nearest(texObj->WrapS, texcoord[0], width); + *j = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height); + *k = 0; + break; + case GL_TEXTURE_1D: + *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]); + *j = 0; + *k = 0; + break; + case GL_TEXTURE_2D: + *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]); + *j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]); + *k = 0; + break; + case GL_TEXTURE_1D_ARRAY_EXT: + *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]); + *j = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height); + *k = 0; + break; + case GL_TEXTURE_2D_ARRAY_EXT: + *i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]); + *j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]); + *k = clamp_rect_coord_nearest(texObj->WrapR, texcoord[2], depth); + break; + default: + *i = *j = *k = 0; + } +} + + +/** + * Compute linear integer texcoords for given texobj and coordinate. + */ +static INLINE void +linear_texcoord(const struct gl_texture_object *texObj, + const GLfloat texcoord[4], + GLint *i0, GLint *i1, GLint *j0, GLint *j1, GLint *slice, + GLfloat *wi, GLfloat *wj) +{ + const GLint baseLevel = texObj->BaseLevel; + const struct gl_texture_image *img = texObj->Image[0][baseLevel]; + const GLint width = img->Width; + const GLint height = img->Height; + const GLint depth = img->Depth; + + switch (texObj->Target) { + case GL_TEXTURE_RECTANGLE_ARB: + clamp_rect_coord_linear(texObj->WrapS, texcoord[0], + width, i0, i1, wi); + clamp_rect_coord_linear(texObj->WrapT, texcoord[1], + height, j0, j1, wj); + *slice = 0; + break; + + case GL_TEXTURE_1D: + case GL_TEXTURE_2D: + linear_texel_locations(texObj->WrapS, img, width, + texcoord[0], i0, i1, wi); + linear_texel_locations(texObj->WrapT, img, height, + texcoord[1], j0, j1, wj); + *slice = 0; + break; + + case GL_TEXTURE_1D_ARRAY_EXT: + linear_texel_locations(texObj->WrapS, img, width, + texcoord[0], i0, i1, wi); + *j0 = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height); + *j1 = *j0; + *slice = 0; + break; + + case GL_TEXTURE_2D_ARRAY_EXT: + linear_texel_locations(texObj->WrapS, img, width, + texcoord[0], i0, i1, wi); + linear_texel_locations(texObj->WrapT, img, height, + texcoord[1], j0, j1, wj); + *slice = clamp_rect_coord_nearest(texObj->WrapR, texcoord[2], depth); + break; + + default: + *slice = 0; + } +} + + + +/** * For linear interpolation between mipmap levels N and N+1, this function * computes N. */ @@ -1970,66 +2132,6 @@ sample_lambda_cube(GLcontext *ctx, /**********************************************************************/ -/** - * 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; - 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, @@ -2754,6 +2856,102 @@ sample_lambda_1d_array(GLcontext *ctx, /** + * Compare texcoord against depth sample. Return 1.0 or the ambient value. + */ +static INLINE GLfloat +shadow_compare(GLenum function, GLfloat coord, GLfloat depthSample, + GLfloat ambient) +{ + switch (function) { + case GL_LEQUAL: + return (coord <= depthSample) ? 1.0F : ambient; + case GL_GEQUAL: + return (coord >= depthSample) ? 1.0F : ambient; + case GL_LESS: + return (coord < depthSample) ? 1.0F : ambient; + case GL_GREATER: + return (coord > depthSample) ? 1.0F : ambient; + case GL_EQUAL: + return (coord == depthSample) ? 1.0F : ambient; + case GL_NOTEQUAL: + return (coord != depthSample) ? 1.0F : ambient; + case GL_ALWAYS: + return 1.0F; + case GL_NEVER: + return ambient; + case GL_NONE: + return depthSample; + default: + _mesa_problem(NULL, "Bad compare func in shadow_compare"); + return ambient; + } +} + + +/** + * Compare texcoord against four depth samples. + */ +static INLINE GLfloat +shadow_compare4(GLenum function, GLfloat coord, + GLfloat depth00, GLfloat depth01, + GLfloat depth10, GLfloat depth11, + GLfloat ambient, GLfloat wi, GLfloat wj) +{ + const GLfloat d = (1.0F - (GLfloat) ambient) * 0.25F; + GLfloat luminance = 1.0F; + + switch (function) { + case GL_LEQUAL: + if (depth00 <= coord) luminance -= d; + if (depth01 <= coord) luminance -= d; + if (depth10 <= coord) luminance -= d; + if (depth11 <= coord) luminance -= d; + return luminance; + case GL_GEQUAL: + if (depth00 >= coord) luminance -= d; + if (depth01 >= coord) luminance -= d; + if (depth10 >= coord) luminance -= d; + if (depth11 >= coord) luminance -= d; + return luminance; + case GL_LESS: + if (depth00 < coord) luminance -= d; + if (depth01 < coord) luminance -= d; + if (depth10 < coord) luminance -= d; + if (depth11 < coord) luminance -= d; + return luminance; + case GL_GREATER: + if (depth00 > coord) luminance -= d; + if (depth01 > coord) luminance -= d; + if (depth10 > coord) luminance -= d; + if (depth11 > coord) luminance -= d; + return luminance; + case GL_EQUAL: + if (depth00 == coord) luminance -= d; + if (depth01 == coord) luminance -= d; + if (depth10 == coord) luminance -= d; + if (depth11 == coord) luminance -= d; + return luminance; + case GL_NOTEQUAL: + if (depth00 != coord) luminance -= d; + if (depth01 != coord) luminance -= d; + if (depth10 != coord) luminance -= d; + if (depth11 != coord) luminance -= d; + return luminance; + case GL_ALWAYS: + return 0.0; + case GL_NEVER: + return ambient; + case GL_NONE: + /* ordinary bilinear filtering */ + return lerp_2d(wi, wj, depth00, depth10, depth01, depth11); + default: + _mesa_problem(NULL, "Bad compare func in sample_depth_texture"); + return 0.0F; + } +} + + +/** * Sample a shadow/depth texture. */ static void @@ -2797,45 +2995,7 @@ sample_depth_texture( GLcontext *ctx, 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; - } + nearest_texcoord(tObj, texcoords[i], &col, &row, &slice); if (col >= 0 && row >= 0 && col < width && row < height && slice >= 0 && slice < depth) { @@ -2845,38 +3005,8 @@ sample_depth_texture( GLcontext *ctx, depthSample = tObj->BorderColor[0]; } - switch (function) { - case GL_LEQUAL: - result = (texcoords[i][compare_coord] <= depthSample) ? 1.0F : ambient; - break; - case GL_GEQUAL: - result = (texcoords[i][compare_coord] >= depthSample) ? 1.0F : ambient; - break; - case GL_LESS: - result = (texcoords[i][compare_coord] < depthSample) ? 1.0F : ambient; - break; - case GL_GREATER: - result = (texcoords[i][compare_coord] > depthSample) ? 1.0F : ambient; - break; - case GL_EQUAL: - result = (texcoords[i][compare_coord] == depthSample) ? 1.0F : ambient; - break; - case GL_NOTEQUAL: - result = (texcoords[i][compare_coord] != depthSample) ? 1.0F : ambient; - break; - case GL_ALWAYS: - result = 1.0F; - break; - case GL_NEVER: - result = ambient; - break; - case GL_NONE: - result = depthSample; - break; - default: - _mesa_problem(ctx, "Bad compare func in sample_depth_texture"); - return; - } + result = shadow_compare(function, texcoords[i][compare_coord], + depthSample, ambient); switch (tObj->DepthMode) { case GL_LUMINANCE: @@ -2900,45 +3030,11 @@ sample_depth_texture( GLcontext *ctx, GLfloat depth00, depth01, depth10, depth11; GLint i0, i1, j0, j1; GLint slice; - GLfloat a, b; + GLfloat wi, wj; GLuint useBorderTexel; - switch (tObj->Target) { - case GL_TEXTURE_RECTANGLE_ARB: - clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0], - width, &i0, &i1, &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; - } + linear_texcoord(tObj, texcoords[i], &i0, &i1, &j0, &j1, &slice, + &wi, &wj); useBorderTexel = 0; if (img->Border) { @@ -2997,111 +3093,24 @@ sample_depth_texture( GLcontext *ctx, } } - 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 = (GLfloat) 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 = (GLfloat) 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 = (GLfloat) 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 = (GLfloat) 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 = (GLfloat) 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 = (GLfloat) 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; - } - } + result = shadow_compare4(function, texcoords[i][compare_coord], + depth00, depth01, depth10, depth11, + ambient, wi, wj); switch (tObj->DepthMode) { case GL_LUMINANCE: - texel[i][RCOMP] = result; - texel[i][GCOMP] = result; - texel[i][BCOMP] = result; - texel[i][ACOMP] = CHAN_MAX; + ASSIGN_4V(texel[i], result, result, result, 1.0F); break; case GL_INTENSITY: - texel[i][RCOMP] = result; - texel[i][GCOMP] = result; - texel[i][BCOMP] = result; - texel[i][ACOMP] = result; + ASSIGN_4V(texel[i], result, result, result, result); break; case GL_ALPHA: - texel[i][RCOMP] = 0; - texel[i][GCOMP] = 0; - texel[i][BCOMP] = 0; - texel[i][ACOMP] = result; + ASSIGN_4V(texel[i], 0.0F, 0.0F, 0.0F, result); break; default: _mesa_problem(ctx, "Bad depth texture mode"); } + } /* for */ } /* if filter */ } |