1f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/* 2f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Mesa 3-D graphics library 3f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Version: 6.5.2 4f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 5f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. 6f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 7f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Permission is hereby granted, free of charge, to any person obtaining a 8f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * copy of this software and associated documentation files (the "Software"), 9f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * to deal in the Software without restriction, including without limitation 10f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * and/or sell copies of the Software, and to permit persons to whom the 12f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software is furnished to do so, subject to the following conditions: 13f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 14f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * The above copyright notice and this permission notice shall be included 15f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * in all copies or substantial portions of the Software. 16f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 17f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 18f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 21f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 22f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 24f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 25f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 26f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "main/glheader.h" 27f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "main/colormac.h" 28f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "main/macros.h" 29f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 30f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "s_context.h" 31f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "s_fog.h" 32f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 33f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 34f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/** 35f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Used to convert current raster distance to a fog factor in [0,1]. 36f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 37f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgGLfloat 38f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org_swrast_z_to_fogfactor(struct gl_context *ctx, GLfloat z) 39f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 40f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat d, f; 41f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 42f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org switch (ctx->Fog.Mode) { 43f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GL_LINEAR: 44f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (ctx->Fog.Start == ctx->Fog.End) 45f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org d = 1.0F; 46f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else 47f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org d = 1.0F / (ctx->Fog.End - ctx->Fog.Start); 48f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = (ctx->Fog.End - z) * d; 49f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return CLAMP(f, 0.0F, 1.0F); 50f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GL_EXP: 51f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org d = ctx->Fog.Density; 52f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = EXPF(-d * z); 53f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = CLAMP(f, 0.0F, 1.0F); 54f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return f; 55f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GL_EXP2: 56f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org d = ctx->Fog.Density; 57f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = EXPF(-(d * d * z * z)); 58f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = CLAMP(f, 0.0F, 1.0F); 59f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return f; 60f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org default: 61f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org _mesa_problem(ctx, "Bad fog mode in _swrast_z_to_fogfactor"); 62f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return 0.0; 63f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 64f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 65f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 66f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 67f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define LINEAR_FOG(f, coord) f = (fogEnd - coord) * fogScale 68f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 69f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define EXP_FOG(f, coord) f = EXPF(density * coord) 70f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 71f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define EXP2_FOG(f, coord) \ 72f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgdo { \ 73f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat tmp = negDensitySquared * coord * coord; \ 74f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (tmp < FLT_MIN_10_EXP) \ 75f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org tmp = FLT_MIN_10_EXP; \ 76f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = EXPF(tmp); \ 77f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } while(0) 78f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 79f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 80f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define BLEND_FOG(f, coord) f = coord 81f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 82f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 83f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 84f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/** 85f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Template code for computing fog blend factor and applying it to colors. 86f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * \param TYPE either GLubyte, GLushort or GLfloat. 87f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * \param COMPUTE_F code to compute the fog blend factor, f. 88f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 89f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define FOG_LOOP(TYPE, FOG_FUNC) \ 90f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgif (span->arrayAttribs & FRAG_BIT_FOGC) { \ 91f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLuint i; \ 92f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (i = 0; i < span->end; i++) { \ 93f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat fogCoord = span->array->attribs[FRAG_ATTRIB_FOGC][i][0]; \ 94f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat c = FABSF(fogCoord); \ 95f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat f, oneMinusF; \ 96f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_FUNC(f, c); \ 97f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = CLAMP(f, 0.0F, 1.0F); \ 98f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org oneMinusF = 1.0F - f; \ 99f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rgba[i][RCOMP] = (TYPE) (f * rgba[i][RCOMP] + oneMinusF * rFog); \ 100f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rgba[i][GCOMP] = (TYPE) (f * rgba[i][GCOMP] + oneMinusF * gFog); \ 101f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rgba[i][BCOMP] = (TYPE) (f * rgba[i][BCOMP] + oneMinusF * bFog); \ 102f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } \ 103f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} \ 104f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgelse { \ 105f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0]; \ 106f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0]; \ 107f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat wStep = span->attrStepX[FRAG_ATTRIB_WPOS][3]; \ 108f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3]; \ 109f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLuint i; \ 110f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (i = 0; i < span->end; i++) { \ 111f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat c = FABSF(fogCoord) / w; \ 112f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat f, oneMinusF; \ 113f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_FUNC(f, c); \ 114f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org f = CLAMP(f, 0.0F, 1.0F); \ 115f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org oneMinusF = 1.0F - f; \ 116f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rgba[i][RCOMP] = (TYPE) (f * rgba[i][RCOMP] + oneMinusF * rFog); \ 117f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rgba[i][GCOMP] = (TYPE) (f * rgba[i][GCOMP] + oneMinusF * gFog); \ 118f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rgba[i][BCOMP] = (TYPE) (f * rgba[i][BCOMP] + oneMinusF * bFog); \ 119f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org fogCoord += fogStep; \ 120f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org w += wStep; \ 121f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } \ 122f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 123f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 124f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/** 125f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Apply fog to a span of RGBA pixels. 126f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * The fog value are either in the span->array->fog array or interpolated from 127f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * the fog/fogStep values. 128f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * They fog values are either fog coordinates (Z) or fog blend factors. 129f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * _PreferPixelFog should be in sync with that state! 130f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 131f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgvoid 132f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org_swrast_fog_rgba_span( const struct gl_context *ctx, SWspan *span ) 133f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 134f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const SWcontext *swrast = CONST_SWRAST_CONTEXT(ctx); 135f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat rFog, gFog, bFog; 136f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 137f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ASSERT(swrast->_FogEnabled); 138f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ASSERT(span->arrayMask & SPAN_RGBA); 139f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 140f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* compute (scaled) fog color */ 141f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (span->array->ChanType == GL_UNSIGNED_BYTE) { 142f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rFog = ctx->Fog.Color[RCOMP] * 255.0F; 143f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org gFog = ctx->Fog.Color[GCOMP] * 255.0F; 144f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bFog = ctx->Fog.Color[BCOMP] * 255.0F; 145f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 146f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else if (span->array->ChanType == GL_UNSIGNED_SHORT) { 147f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rFog = ctx->Fog.Color[RCOMP] * 65535.0F; 148f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org gFog = ctx->Fog.Color[GCOMP] * 65535.0F; 149f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bFog = ctx->Fog.Color[BCOMP] * 65535.0F; 150f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 151f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 152f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org rFog = ctx->Fog.Color[RCOMP]; 153f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org gFog = ctx->Fog.Color[GCOMP]; 154f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bFog = ctx->Fog.Color[BCOMP]; 155f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 156f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 157f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (swrast->_PreferPixelFog) { 158f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* The span's fog values are fog coordinates, now compute blend factors 159f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * and blend the fragment colors with the fog color. 160f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 161f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org switch (ctx->Fog.Mode) { 162f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GL_LINEAR: 163f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 164f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat fogEnd = ctx->Fog.End; 165f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat fogScale = (ctx->Fog.Start == ctx->Fog.End) 166f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ? 1.0F : 1.0F / (ctx->Fog.End - ctx->Fog.Start); 167f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (span->array->ChanType == GL_UNSIGNED_BYTE) { 168f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLubyte (*rgba)[4] = span->array->rgba8; 169f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLubyte, LINEAR_FOG); 170f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 171f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else if (span->array->ChanType == GL_UNSIGNED_SHORT) { 172f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLushort (*rgba)[4] = span->array->rgba16; 173f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLushort, LINEAR_FOG); 174f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 175f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 176f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; 177f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ASSERT(span->array->ChanType == GL_FLOAT); 178f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLfloat, LINEAR_FOG); 179f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 180f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 181f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 182f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 183f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GL_EXP: 184f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 185f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat density = -ctx->Fog.Density; 186f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (span->array->ChanType == GL_UNSIGNED_BYTE) { 187f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLubyte (*rgba)[4] = span->array->rgba8; 188f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLubyte, EXP_FOG); 189f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 190f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else if (span->array->ChanType == GL_UNSIGNED_SHORT) { 191f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLushort (*rgba)[4] = span->array->rgba16; 192f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLushort, EXP_FOG); 193f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 194f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 195f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; 196f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ASSERT(span->array->ChanType == GL_FLOAT); 197f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLfloat, EXP_FOG); 198f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 199f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 200f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 201f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 202f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org case GL_EXP2: 203f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 204f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density; 205f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (span->array->ChanType == GL_UNSIGNED_BYTE) { 206f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLubyte (*rgba)[4] = span->array->rgba8; 207f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLubyte, EXP2_FOG); 208f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 209f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else if (span->array->ChanType == GL_UNSIGNED_SHORT) { 210f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLushort (*rgba)[4] = span->array->rgba16; 211f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLushort, EXP2_FOG); 212f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 213f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 214f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; 215f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ASSERT(span->array->ChanType == GL_FLOAT); 216f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLfloat, EXP2_FOG); 217f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 218f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 219f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 220f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 221f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org default: 222f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span"); 223f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return; 224f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 225f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 226f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 227f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* The span's fog start/step/array values are blend factors in [0,1]. 228f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * They were previously computed per-vertex. 229f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 230f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (span->array->ChanType == GL_UNSIGNED_BYTE) { 231f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLubyte (*rgba)[4] = span->array->rgba8; 232f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLubyte, BLEND_FOG); 233f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 234f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else if (span->array->ChanType == GL_UNSIGNED_SHORT) { 235f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLushort (*rgba)[4] = span->array->rgba16; 236f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLushort, BLEND_FOG); 237f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 238f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 239f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; 240f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ASSERT(span->array->ChanType == GL_FLOAT); 241f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org FOG_LOOP(GLfloat, BLEND_FOG); 242f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 243f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 244f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 245