summaryrefslogtreecommitdiffstats
path: root/src/mesa/swrast/s_fog.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mesa/swrast/s_fog.c')
-rw-r--r--src/mesa/swrast/s_fog.c335
1 files changed, 141 insertions, 194 deletions
diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c
index 433fc4a4d0c..ed47964a66a 100644
--- a/src/mesa/swrast/s_fog.c
+++ b/src/mesa/swrast/s_fog.c
@@ -65,30 +65,92 @@ _swrast_z_to_fogfactor(GLcontext *ctx, GLfloat z)
}
+#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 & 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; \
+ } \
+}
+
+/* As above, but CI mode (XXX try to merge someday) */
+#define FOG_LOOP_CI(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; \
+ FOG_FUNC(f, c); \
+ f = CLAMP(f, 0.0F, 1.0F); \
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex); \
+ } \
+} \
+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; \
+ FOG_FUNC(f, c); \
+ f = CLAMP(f, 0.0F, 1.0F); \
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex); \
+ fogCoord += fogStep; \
+ w += wStep; \
+ } \
+}
@@ -104,12 +166,12 @@ _swrast_fog_rgba_span( const GLcontext *ctx, SWspan *span )
{
const SWcontext *swrast = 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(swrast->_ActiveAttribMask & FRAG_BIT_FOGC);
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;
@@ -126,79 +188,68 @@ _swrast_fog_rgba_span( const GLcontext *ctx, SWspan *span )
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);
+ {
+ 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);
+ }
}
-#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);
+ {
+ 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);
+ }
}
-#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);
+ {
+ 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);
+ }
}
-#undef COMPUTE_F
break;
default:
@@ -206,63 +257,23 @@ _swrast_fog_rgba_span( const GLcontext *ctx, SWspan *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.
+ /* The span's fog start/step/array values are blend factors in [0,1].
* 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);
+ GLubyte (*rgba)[4] = span->array->rgba8;
+ FOG_LOOP(GLubyte, BLEND_FOG);
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = span->array->color.sz2.rgba;
- FOG_LOOP(GLushort, COMPUTE_F);
+ 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, COMPUTE_F);
+ FOG_LOOP(GLfloat, BLEND_FOG);
}
-#undef COMPUTE_F
}
}
@@ -274,13 +285,11 @@ 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) {
@@ -293,60 +302,19 @@ _swrast_fog_ci_span( const GLcontext *ctx, SWspan *span )
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;
- }
+ FOG_LOOP_CI(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;
- }
+ FOG_LOOP_CI(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;
- }
+ FOG_LOOP_CI(EXP2_FOG);
}
break;
default:
@@ -354,31 +322,10 @@ _swrast_fog_ci_span( const GLcontext *ctx, SWspan *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;
- }
+ FOG_LOOP_CI(BLEND_FOG);
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 07:36:32 +0000