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Diffstat (limited to 'src/mesa/swrast/s_fog.c')
-rw-r--r-- | src/mesa/swrast/s_fog.c | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c deleted file mode 100644 index 33da09b618d..00000000000 --- a/src/mesa/swrast/s_fog.c +++ /dev/null @@ -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); - } - } -} |