/*
* Mesa 3-D graphics library
- * Version: 6.5.2
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* 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.
+ * 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 "glheader.h"
-#include "colormac.h"
-#include "context.h"
-#include "macros.h"
+#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(GLcontext *ctx, GLfloat z)
+_swrast_z_to_fogfactor(struct gl_context *ctx, GLfloat z)
{
GLfloat d, f;
return CLAMP(f, 0.0F, 1.0F);
case GL_EXP:
d = ctx->Fog.Density;
- f = EXPF(-d * z);
+ 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 = expf(-(d * d * z * z));
f = CLAMP(f, 0.0F, 1.0F);
return f;
default:
}
+#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, COMPUTE_F) \
-do { \
- const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0]; \
- GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0]; \
- const GLfloat wStep = haveW ? span->attrStepX[FRAG_ATTRIB_WPOS][3] : 0.0F;\
- GLfloat w = haveW ? span->attrStart[FRAG_ATTRIB_WPOS][3] : 1.0F; \
- GLuint i; \
- for (i = 0; i < span->end; i++) { \
- GLfloat f, oneMinusF; \
- COMPUTE_F; \
- 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; \
- } \
-} while (0)
-
-
+#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.
* _PreferPixelFog should be in sync with that state!
*/
void
-_swrast_fog_rgba_span( const GLcontext *ctx, SWspan *span )
+_swrast_fog_rgba_span( const struct gl_context *ctx, SWspan *span )
{
- const SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const SWcontext *swrast = CONST_SWRAST_CONTEXT(ctx);
GLfloat rFog, gFog, bFog;
- const GLuint haveW = (span->interpMask & SPAN_W);
- ASSERT(swrast->_FogEnabled);
- ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
- ASSERT(span->arrayMask & SPAN_RGBA);
+ assert(swrast->_FogEnabled);
+ assert(span->arrayMask & SPAN_RGBA);
+ /* compute (scaled) fog color */
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- rFog = ctx->Fog.Color[RCOMP] * 255.0;
- gFog = ctx->Fog.Color[GCOMP] * 255.0;
- bFog = ctx->Fog.Color[BCOMP] * 255.0;
+ 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] * 65535.0;
- gFog = ctx->Fog.Color[GCOMP] * 65535.0;
- bFog = ctx->Fog.Color[BCOMP] * 65535.0;
+ 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];
bFog = ctx->Fog.Color[BCOMP];
}
-
- /* NOTE: if haveW is true, that means the fog start/step values are
- * perspective-corrected and we have to divide each fog coord by W.
- */
-
- /* we need to compute fog blend factors */
- if (swrast->_PreferPixelFog) {
- /* The span's fog values are fog coordinates, now compute blend factors
- * and blend the fragment colors with the fog color.
- */
- 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);
- const GLfloat density = -ctx->Fog.Density;
- const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
-
- switch (swrast->_FogMode) {
- case GL_LINEAR:
-#define COMPUTE_F f = (fogEnd - FABSF(fogCoord) / w) * fogScale;
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
- FOG_LOOP(GLubyte, COMPUTE_F);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->color.sz2.rgba;
- FOG_LOOP(GLushort, COMPUTE_F);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, COMPUTE_F);
- }
-#undef COMPUTE_F
- break;
-
- case GL_EXP:
-#define COMPUTE_F f = EXPF(density * FABSF(fogCoord) / w);
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
- FOG_LOOP(GLubyte, COMPUTE_F);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->color.sz2.rgba;
- FOG_LOOP(GLushort, COMPUTE_F);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, COMPUTE_F);
- }
-#undef COMPUTE_F
- break;
-
- case GL_EXP2:
-#define COMPUTE_F const GLfloat coord = fogCoord / w; \
- GLfloat tmp = negDensitySquared * coord * coord; \
- if (tmp < FLT_MIN_10_EXP) \
- tmp = FLT_MIN_10_EXP; \
- f = EXPF(tmp);
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
- FOG_LOOP(GLubyte, COMPUTE_F);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->color.sz2.rgba;
- FOG_LOOP(GLushort, COMPUTE_F);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, COMPUTE_F);
- }
-#undef COMPUTE_F
- break;
-
- default:
- _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span");
- return;
- }
- }
- else if (span->arrayMask & SPAN_FOG) {
- /* The span's fog array values are blend factors.
- * They were previously computed per-vertex.
- */
- GLuint i;
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
- for (i = 0; i < span->end; i++) {
- const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
- const GLfloat oneMinusF = 1.0F - f;
- rgba[i][RCOMP] = (GLubyte) (f * rgba[i][RCOMP] + oneMinusF * rFog);
- rgba[i][GCOMP] = (GLubyte) (f * rgba[i][GCOMP] + oneMinusF * gFog);
- rgba[i][BCOMP] = (GLubyte) (f * rgba[i][BCOMP] + oneMinusF * bFog);
- }
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->color.sz2.rgba;
- for (i = 0; i < span->end; i++) {
- const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
- const GLfloat oneMinusF = 1.0F - f;
- rgba[i][RCOMP] = (GLushort) (f * rgba[i][RCOMP] + oneMinusF * rFog);
- rgba[i][GCOMP] = (GLushort) (f * rgba[i][GCOMP] + oneMinusF * gFog);
- rgba[i][BCOMP] = (GLushort) (f * rgba[i][BCOMP] + oneMinusF * bFog);
- }
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- for (i = 0; i < span->end; i++) {
- const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
- const GLfloat oneMinusF = 1.0F - f;
- rgba[i][RCOMP] = f * rgba[i][RCOMP] + oneMinusF * rFog;
- rgba[i][GCOMP] = f * rgba[i][GCOMP] + oneMinusF * gFog;
- rgba[i][BCOMP] = f * rgba[i][BCOMP] + oneMinusF * bFog;
- }
- }
-
- }
- else {
- /* The span's fog start/step values are blend factors.
- * They were previously computed per-vertex.
- */
-#define COMPUTE_F f = fogCoord / w;
- if (span->array->ChanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
- FOG_LOOP(GLubyte, COMPUTE_F);
- }
- else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->color.sz2.rgba;
- FOG_LOOP(GLushort, COMPUTE_F);
- }
- else {
- GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
- ASSERT(span->array->ChanType == GL_FLOAT);
- FOG_LOOP(GLfloat, COMPUTE_F);
- }
-#undef COMPUTE_F
- }
-}
-
-
-/**
- * As above, but color index mode.
- */
-void
-_swrast_fog_ci_span( const GLcontext *ctx, SWspan *span )
-{
- const SWcontext *swrast = SWRAST_CONTEXT(ctx);
- const GLuint haveW = (span->interpMask & SPAN_W);
- const GLuint fogIndex = (GLuint) ctx->Fog.Index;
- GLuint *index = span->array->index;
-
- ASSERT(swrast->_FogEnabled);
- ASSERT(span->arrayMask & SPAN_INDEX);
- ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
-
- /* we need to compute fog blend factors */
if (swrast->_PreferPixelFog) {
/* The span's fog values are fog coordinates, now compute blend factors
* and blend the fragment colors with the fog color.
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);
- const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0];
- GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0];
- const GLfloat wStep = haveW ? span->attrStepX[FRAG_ATTRIB_WPOS][3] : 0.0F;
- GLfloat w = haveW ? span->attrStart[FRAG_ATTRIB_WPOS][3] : 1.0F;
- GLuint i;
- for (i = 0; i < span->end; i++) {
- GLfloat f = (fogEnd - fogCoord / w) * fogScale;
- f = CLAMP(f, 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
- fogCoord += fogStep;
- w += wStep;
+ 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;
- const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0];
- GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0];
- const GLfloat wStep = haveW ? span->attrStepX[FRAG_ATTRIB_WPOS][3] : 0.0F;
- GLfloat w = haveW ? span->attrStart[FRAG_ATTRIB_WPOS][3] : 1.0F;
- GLuint i;
- for (i = 0; i < span->end; i++) {
- GLfloat f = EXPF(density * fogCoord / w);
- f = CLAMP(f, 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
- fogCoord += fogStep;
- w += wStep;
+ 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;
- const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0];
- GLfloat fogCoord = span->attrStart[FRAG_ATTRIB_FOGC][0];
- const GLfloat wStep = haveW ? span->attrStepX[FRAG_ATTRIB_WPOS][3] : 0.0F;
- GLfloat w = haveW ? span->attrStart[FRAG_ATTRIB_WPOS][3] : 1.0F;
- GLuint i;
- for (i = 0; i < span->end; i++) {
- const GLfloat coord = fogCoord / w;
- GLfloat tmp = negDensitySquared * coord * coord;
- GLfloat f;
-#if defined(__alpha__) || defined(__alpha)
- /* XXX this underflow check may be needed for other systems*/
- if (tmp < FLT_MIN_10_EXP)
- tmp = FLT_MIN_10_EXP;
-#endif
- f = EXPF(tmp);
- f = CLAMP(f, 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
- fogCoord += fogStep;
- w += wStep;
+ 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_ci_span");
+ _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span");
return;
}
}
- else if (span->arrayMask & SPAN_FOG) {
- /* The span's fog array values are blend factors.
- * They were previously computed per-vertex.
- */
- GLuint i;
- for (i = 0; i < span->end; i++) {
- const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
- }
- }
else {
- /* The span's fog start/step values are blend factors.
+ /* The span's fog start/step/array values are blend factors in [0,1].
* They were previously computed per-vertex.
*/
- const GLfloat fogStep = span->attrStepX[FRAG_ATTRIB_FOGC][0];
- GLfloat fog = span->attrStart[FRAG_ATTRIB_FOGC][0];
- const GLfloat wStep = haveW ? span->attrStepX[FRAG_ATTRIB_WPOS][3] : 0.0F;
- GLfloat w = haveW ? span->attrStart[FRAG_ATTRIB_WPOS][3] : 1.0F;
- GLuint i;
- ASSERT(span->interpMask & SPAN_FOG);
- for (i = 0; i < span->end; i++) {
- const GLfloat f = fog / w;
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
- fog += fogStep;
- w += wStep;
+ 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);
}
}
}
projects / mesa.git / blobdiff