diff options
| -rw-r--r-- | src/mesa/swrast/s_span.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index 449ae837dc..a541b66ceb 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -280,6 +280,26 @@ interpolate_specular(GLcontext *ctx, struct sw_span *span) } +/* Fill in the span.array.fog values from the interpolation values */ +static void +interpolate_fog(const GLcontext *ctx, struct sw_span *span) +{ + GLfloat *fog = span->array->fog; + const GLfloat fogStep = span->fogStep; + GLfloat fogCoord = span->fog; + const GLuint haveW = (span->interpMask & SPAN_W); + const GLfloat wStep = haveW ? span->dwdx : 0.0F; + GLfloat w = haveW ? span->w : 1.0F; + GLuint i; + for (i = 0; i < span->end; i++) { + fog[i] = fogCoord / w; + fogCoord += fogStep; + w += wStep; + } + span->arrayMask |= SPAN_FOG; +} + + /* Fill in the span.zArray array from the interpolation values */ void _swrast_span_interpolate_z( const GLcontext *ctx, struct sw_span *span ) @@ -1150,6 +1170,9 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span) if (span->interpMask & SPAN_SPEC) interpolate_specular(ctx, span); + if (span->interpMask & SPAN_FOG) + interpolate_fog(ctx, span); + /* Compute fragment colors with fragment program or texture lookups */ if (ctx->FragmentProgram._Enabled) /* XXX interpolate depth values here??? */ @@ -1226,6 +1249,9 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span) if (span->interpMask & SPAN_SPEC) interpolate_specular(ctx, span); + if (span->interpMask & SPAN_FOG) + interpolate_fog(ctx, span); + if (ctx->FragmentProgram._Enabled) _swrast_exec_fragment_program( ctx, span ); else if (ctx->ATIFragmentShader._Enabled) |