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author | marha <marha@users.sourceforge.net> | 2011-09-12 11:27:51 +0200 |
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committer | marha <marha@users.sourceforge.net> | 2011-09-12 11:27:51 +0200 |
commit | dafebc5bb70303f0b5baf0b087cf4d9a64b5c7f0 (patch) | |
tree | bdf833cc6a4fc9035411779e10dd9e8478201885 /mesalib/src/mesa/swrast/s_fog.c | |
parent | 0b40f5f4b54453a77f4b09c431f8efc6875da61f (diff) | |
download | vcxsrv-dafebc5bb70303f0b5baf0b087cf4d9a64b5c7f0.tar.gz vcxsrv-dafebc5bb70303f0b5baf0b087cf4d9a64b5c7f0.tar.bz2 vcxsrv-dafebc5bb70303f0b5baf0b087cf4d9a64b5c7f0.zip |
Synchronised line endinge with release branch
Diffstat (limited to 'mesalib/src/mesa/swrast/s_fog.c')
-rw-r--r-- | mesalib/src/mesa/swrast/s_fog.c | 488 |
1 files changed, 244 insertions, 244 deletions
diff --git a/mesalib/src/mesa/swrast/s_fog.c b/mesalib/src/mesa/swrast/s_fog.c index 5df071481..ea59de160 100644 --- a/mesalib/src/mesa/swrast/s_fog.c +++ b/mesalib/src/mesa/swrast/s_fog.c @@ -1,244 +1,244 @@ -/*
- * Mesa 3-D graphics library
- * Version: 6.5.2
- *
- * Copyright (C) 1999-2006 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/colormac.h"
-#include "main/macros.h"
-
-#include "s_context.h"
-#include "s_fog.h"
-
-
-/**
- * Used to convert current raster distance to a fog factor in [0,1].
- */
-GLfloat
-_swrast_z_to_fogfactor(struct gl_context *ctx, GLfloat z)
-{
- GLfloat d, f;
-
- switch (ctx->Fog.Mode) {
- case GL_LINEAR:
- if (ctx->Fog.Start == ctx->Fog.End)
- d = 1.0F;
- else
- d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
- f = (ctx->Fog.End - z) * d;
- return CLAMP(f, 0.0F, 1.0F);
- case GL_EXP:
- d = ctx->Fog.Density;
- f = EXPF(-d * z);
- f = CLAMP(f, 0.0F, 1.0F);
- return f;
- case GL_EXP2:
- d = ctx->Fog.Density;
- f = EXPF(-(d * d * z * z));
- f = CLAMP(f, 0.0F, 1.0F);
- return f;
- default:
- _mesa_problem(ctx, "Bad fog mode in _swrast_z_to_fogfactor");
- return 0.0;
- }
-}
-
-
-#define LINEAR_FOG(f, coord) f = (fogEnd - coord) * fogScale
-
-#define EXP_FOG(f, coord) f = EXPF(density * coord)
-
-#define EXP2_FOG(f, coord) \
-do { \
- GLfloat tmp = negDensitySquared * coord * coord; \
- if (tmp < FLT_MIN_10_EXP) \
- tmp = FLT_MIN_10_EXP; \
- f = EXPF(tmp); \
- } while(0)
-
-
-#define BLEND_FOG(f, coord) f = coord
-
-
-
-/**
- * Template code for computing fog blend factor and applying it to colors.
- * \param TYPE either GLubyte, GLushort or GLfloat.
- * \param COMPUTE_F code to compute the fog blend factor, f.
- */
-#define FOG_LOOP(TYPE, FOG_FUNC) \
-if (span->arrayAttribs & FRAG_BIT_FOGC) { \
- GLuint i; \
- for (i = 0; i < span->end; i++) { \
- const GLfloat fogCoord = span->array->attribs[FRAG_ATTRIB_FOGC][i][0]; \
- const GLfloat c = FABSF(fogCoord); \
- GLfloat f, oneMinusF; \
- FOG_FUNC(f, c); \
- f = CLAMP(f, 0.0F, 1.0F); \
- oneMinusF = 1.0F - f; \
- rgba[i][RCOMP] = (TYPE) (f * rgba[i][RCOMP] + oneMinusF * rFog); \
- rgba[i][GCOMP] = (TYPE) (f * rgba[i][GCOMP] + oneMinusF * gFog); \
- rgba[i][BCOMP] = (TYPE) (f * rgba[i][BCOMP] + oneMinusF * bFog); \
- } \
-} \
-else { \
- const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0]; \
- GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0]; \
- const GLfloat wStep = span->attrStepX[FRAG_ATTRIB_WPOS][3]; \
- GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3]; \
- GLuint i; \
- for (i = 0; i < span->end; i++) { \
- const GLfloat c = FABSF(fogCoord) / w; \
- GLfloat f, oneMinusF; \
- FOG_FUNC(f, c); \
- f = CLAMP(f, 0.0F, 1.0F); \
- oneMinusF = 1.0F - f; \
- rgba[i][RCOMP] = (TYPE) (f * rgba[i][RCOMP] + oneMinusF * rFog); \
- rgba[i][GCOMP] = (TYPE) (f * rgba[i][GCOMP] + oneMinusF * gFog); \
- rgba[i][BCOMP] = (TYPE) (f * rgba[i][BCOMP] + oneMinusF * bFog); \
- fogCoord += fogStep; \
- w += wStep; \
- } \
-}
-
-/**
- * Apply fog to a span of RGBA pixels.
- * The fog value are either in the span->array->fog array or interpolated from
- * the fog/fogStep values.
- * They fog values are either fog coordinates (Z) or fog blend factors.
- * _PreferPixelFog should be in sync with that state!
- */
-void
-_swrast_fog_rgba_span( const struct gl_context *ctx, SWspan *span )
-{
- const SWcontext *swrast = CONST_SWRAST_CONTEXT(ctx);
- GLfloat rFog, gFog, bFog;
-
- ASSERT(swrast->_FogEnabled);
- ASSERT(span->arrayMask & SPAN_RGBA);
-
- /* compute (scaled) fog color */
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- rFog = ctx->Fog.Color[RCOMP] * 255.0F;
- gFog = ctx->Fog.Color[GCOMP] * 255.0F;
- bFog = ctx->Fog.Color[BCOMP] * 255.0F;
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- rFog = ctx->Fog.Color[RCOMP] * 65535.0F;
- gFog = ctx->Fog.Color[GCOMP] * 65535.0F;
- bFog = ctx->Fog.Color[BCOMP] * 65535.0F;
- }
- else {
- rFog = ctx->Fog.Color[RCOMP];
- gFog = ctx->Fog.Color[GCOMP];
- bFog = ctx->Fog.Color[BCOMP];
- }
-
- if (swrast->_PreferPixelFog) {
- /* The span's fog values are fog coordinates, now compute blend factors
- * and blend the fragment colors with the fog color.
- */
- switch (ctx->Fog.Mode) {
- case GL_LINEAR:
- {
- const GLfloat fogEnd = ctx->Fog.End;
- const GLfloat fogScale = (ctx->Fog.Start == ctx->Fog.End)
- ? 1.0F : 1.0F / (ctx->Fog.End - ctx->Fog.Start);
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->rgba8;
- FOG_LOOP(GLubyte, LINEAR_FOG);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->rgba16;
- FOG_LOOP(GLushort, LINEAR_FOG);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, LINEAR_FOG);
- }
- }
- break;
-
- case GL_EXP:
- {
- const GLfloat density = -ctx->Fog.Density;
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->rgba8;
- FOG_LOOP(GLubyte, EXP_FOG);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->rgba16;
- FOG_LOOP(GLushort, EXP_FOG);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, EXP_FOG);
- }
- }
- break;
-
- case GL_EXP2:
- {
- const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->rgba8;
- FOG_LOOP(GLubyte, EXP2_FOG);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->rgba16;
- FOG_LOOP(GLushort, EXP2_FOG);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, EXP2_FOG);
- }
- }
- break;
-
- default:
- _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span");
- return;
- }
- }
- else {
- /* The span's fog start/step/array values are blend factors in [0,1].
- * They were previously computed per-vertex.
- */
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->rgba8;
- FOG_LOOP(GLubyte, BLEND_FOG);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->rgba16;
- FOG_LOOP(GLushort, BLEND_FOG);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, BLEND_FOG);
- }
- }
-}
+/* + * Mesa 3-D graphics library + * Version: 6.5.2 + * + * Copyright (C) 1999-2006 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/colormac.h" +#include "main/macros.h" + +#include "s_context.h" +#include "s_fog.h" + + +/** + * Used to convert current raster distance to a fog factor in [0,1]. + */ +GLfloat +_swrast_z_to_fogfactor(struct gl_context *ctx, GLfloat z) +{ + GLfloat d, f; + + switch (ctx->Fog.Mode) { + case GL_LINEAR: + if (ctx->Fog.Start == ctx->Fog.End) + d = 1.0F; + else + d = 1.0F / (ctx->Fog.End - ctx->Fog.Start); + f = (ctx->Fog.End - z) * d; + return CLAMP(f, 0.0F, 1.0F); + case GL_EXP: + d = ctx->Fog.Density; + f = EXPF(-d * z); + f = CLAMP(f, 0.0F, 1.0F); + return f; + case GL_EXP2: + d = ctx->Fog.Density; + f = EXPF(-(d * d * z * z)); + f = CLAMP(f, 0.0F, 1.0F); + return f; + default: + _mesa_problem(ctx, "Bad fog mode in _swrast_z_to_fogfactor"); + return 0.0; + } +} + + +#define LINEAR_FOG(f, coord) f = (fogEnd - coord) * fogScale + +#define EXP_FOG(f, coord) f = EXPF(density * coord) + +#define EXP2_FOG(f, coord) \ +do { \ + GLfloat tmp = negDensitySquared * coord * coord; \ + if (tmp < FLT_MIN_10_EXP) \ + tmp = FLT_MIN_10_EXP; \ + f = EXPF(tmp); \ + } while(0) + + +#define BLEND_FOG(f, coord) f = coord + + + +/** + * Template code for computing fog blend factor and applying it to colors. + * \param TYPE either GLubyte, GLushort or GLfloat. + * \param COMPUTE_F code to compute the fog blend factor, f. + */ +#define FOG_LOOP(TYPE, FOG_FUNC) \ +if (span->arrayAttribs & FRAG_BIT_FOGC) { \ + GLuint i; \ + for (i = 0; i < span->end; i++) { \ + const GLfloat fogCoord = span->array->attribs[FRAG_ATTRIB_FOGC][i][0]; \ + const GLfloat c = FABSF(fogCoord); \ + GLfloat f, oneMinusF; \ + FOG_FUNC(f, c); \ + f = CLAMP(f, 0.0F, 1.0F); \ + oneMinusF = 1.0F - f; \ + rgba[i][RCOMP] = (TYPE) (f * rgba[i][RCOMP] + oneMinusF * rFog); \ + rgba[i][GCOMP] = (TYPE) (f * rgba[i][GCOMP] + oneMinusF * gFog); \ + rgba[i][BCOMP] = (TYPE) (f * rgba[i][BCOMP] + oneMinusF * bFog); \ + } \ +} \ +else { \ + const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0]; \ + GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0]; \ + const GLfloat wStep = span->attrStepX[FRAG_ATTRIB_WPOS][3]; \ + GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3]; \ + GLuint i; \ + for (i = 0; i < span->end; i++) { \ + const GLfloat c = FABSF(fogCoord) / w; \ + GLfloat f, oneMinusF; \ + FOG_FUNC(f, c); \ + f = CLAMP(f, 0.0F, 1.0F); \ + oneMinusF = 1.0F - f; \ + rgba[i][RCOMP] = (TYPE) (f * rgba[i][RCOMP] + oneMinusF * rFog); \ + rgba[i][GCOMP] = (TYPE) (f * rgba[i][GCOMP] + oneMinusF * gFog); \ + rgba[i][BCOMP] = (TYPE) (f * rgba[i][BCOMP] + oneMinusF * bFog); \ + fogCoord += fogStep; \ + w += wStep; \ + } \ +} + +/** + * Apply fog to a span of RGBA pixels. + * The fog value are either in the span->array->fog array or interpolated from + * the fog/fogStep values. + * They fog values are either fog coordinates (Z) or fog blend factors. + * _PreferPixelFog should be in sync with that state! + */ +void +_swrast_fog_rgba_span( const struct gl_context *ctx, SWspan *span ) +{ + const SWcontext *swrast = CONST_SWRAST_CONTEXT(ctx); + GLfloat rFog, gFog, bFog; + + ASSERT(swrast->_FogEnabled); + ASSERT(span->arrayMask & SPAN_RGBA); + + /* compute (scaled) fog color */ + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + rFog = ctx->Fog.Color[RCOMP] * 255.0F; + gFog = ctx->Fog.Color[GCOMP] * 255.0F; + bFog = ctx->Fog.Color[BCOMP] * 255.0F; + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + rFog = ctx->Fog.Color[RCOMP] * 65535.0F; + gFog = ctx->Fog.Color[GCOMP] * 65535.0F; + bFog = ctx->Fog.Color[BCOMP] * 65535.0F; + } + else { + rFog = ctx->Fog.Color[RCOMP]; + gFog = ctx->Fog.Color[GCOMP]; + bFog = ctx->Fog.Color[BCOMP]; + } + + if (swrast->_PreferPixelFog) { + /* The span's fog values are fog coordinates, now compute blend factors + * and blend the fragment colors with the fog color. + */ + switch (ctx->Fog.Mode) { + case GL_LINEAR: + { + const GLfloat fogEnd = ctx->Fog.End; + const GLfloat fogScale = (ctx->Fog.Start == ctx->Fog.End) + ? 1.0F : 1.0F / (ctx->Fog.End - ctx->Fog.Start); + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + GLubyte (*rgba)[4] = span->array->rgba8; + FOG_LOOP(GLubyte, LINEAR_FOG); + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + GLushort (*rgba)[4] = span->array->rgba16; + FOG_LOOP(GLushort, LINEAR_FOG); + } + else { + GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; + ASSERT(span->array->ChanType == GL_FLOAT); + FOG_LOOP(GLfloat, LINEAR_FOG); + } + } + break; + + case GL_EXP: + { + const GLfloat density = -ctx->Fog.Density; + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + GLubyte (*rgba)[4] = span->array->rgba8; + FOG_LOOP(GLubyte, EXP_FOG); + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + GLushort (*rgba)[4] = span->array->rgba16; + FOG_LOOP(GLushort, EXP_FOG); + } + else { + GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; + ASSERT(span->array->ChanType == GL_FLOAT); + FOG_LOOP(GLfloat, EXP_FOG); + } + } + break; + + case GL_EXP2: + { + const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density; + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + GLubyte (*rgba)[4] = span->array->rgba8; + FOG_LOOP(GLubyte, EXP2_FOG); + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + GLushort (*rgba)[4] = span->array->rgba16; + FOG_LOOP(GLushort, EXP2_FOG); + } + else { + GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; + ASSERT(span->array->ChanType == GL_FLOAT); + FOG_LOOP(GLfloat, EXP2_FOG); + } + } + break; + + default: + _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span"); + return; + } + } + else { + /* The span's fog start/step/array values are blend factors in [0,1]. + * They were previously computed per-vertex. + */ + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + GLubyte (*rgba)[4] = span->array->rgba8; + FOG_LOOP(GLubyte, BLEND_FOG); + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + GLushort (*rgba)[4] = span->array->rgba16; + FOG_LOOP(GLushort, BLEND_FOG); + } + else { + GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; + ASSERT(span->array->ChanType == GL_FLOAT); + FOG_LOOP(GLfloat, BLEND_FOG); + } + } +} |