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-rw-r--r--src/mesa/swrast/s_fog.c245
1 files changed, 0 insertions, 245 deletions
diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c
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--- a/src/mesa/swrast/s_fog.c
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@@ -1,245 +0,0 @@
-/*
- * Mesa 3-D graphics library
- *
- * 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
- * THE AUTHORS OR COPYRIGHT HOLDERS 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 "c99_math.h"
-#include "main/errors.h"
-#include "main/glheader.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 & VARYING_BIT_FOGC) { \
- GLuint i; \
- for (i = 0; i < span->end; i++) { \
- const GLfloat fogCoord = span->array->attribs[VARYING_SLOT_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[VARYING_SLOT_FOGC][0]; \
- GLfloat fogCoord = span->attrStart[VARYING_SLOT_FOGC][0]; \
- const GLfloat wStep = span->attrStepX[VARYING_SLOT_POS][3]; \
- GLfloat w = span->attrStart[VARYING_SLOT_POS][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[VARYING_SLOT_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[VARYING_SLOT_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[VARYING_SLOT_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[VARYING_SLOT_COL0];
- assert(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, BLEND_FOG);
- }
- }
-}