From 9e8a961dd7d7b717a9fb4ecdea1c1b60ea355efe Mon Sep 17 00:00:00 2001 From: Brian Date: Sun, 20 May 2007 12:27:39 -0600 Subject: Overhaul/simplify SWvertex and SWspan attribute handling. Instead of separate fog/specular/texcoord/varying code, just treat all of them as generic attributes. Simplifies the point/line/triangle functions. --- src/mesa/swrast/s_fog.c | 335 ++++++++++++++++++++---------------------------- 1 file changed, 141 insertions(+), 194 deletions(-) (limited to 'src/mesa/swrast/s_fog.c') diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c index 433fc4a4d0..ed47964a66 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); } } -- cgit v1.2.3