diff options
Diffstat (limited to 'src/mesa/swrast/s_span.c')
| -rw-r--r-- | src/mesa/swrast/s_span.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index 8a2e5d118ed..4fcd4d22517 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -1402,9 +1402,12 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span) || ctx->ShaderObjects._FragmentShaderPresent || ctx->ATIFragmentShader._Enabled; const GLboolean shaderOrTexture = shader || ctx->Texture._EnabledUnits; - const GLboolean deferredTexture - = shaderOrTexture && !ctx->Color.AlphaEnabled; + GLboolean deferredTexture; + /* + printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, + span->interpMask, span->arrayMask); + */ ASSERT(span->primitive == GL_POINT || span->primitive == GL_LINE || @@ -1414,11 +1417,33 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span) ASSERT((span->interpMask & span->arrayMask) == 0); ASSERT((span->interpMask & SPAN_RGBA) ^ (span->arrayMask & SPAN_RGBA)); - /* - printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, - span->interpMask, span->arrayMask); - */ + /* check for conditions that prevent deferred shading */ + if (ctx->Color.AlphaEnabled) { + /* alpha test depends on post-texture/shader colors */ + deferredTexture = GL_FALSE; + } + else if (shaderOrTexture) { + if (ctx->FragmentProgram._Enabled && + (ctx->FragmentProgram.Current->Base.OutputsWritten + & (1 << FRAG_RESULT_DEPR))) { + /* Z comes from fragment program */ + deferredTexture = GL_FALSE; + } + else if (ctx->ShaderObjects._FragmentShaderPresent) { + /* XXX how do we test if Z is written by shader? */ + deferredTexture = GL_FALSE; /* never defer to be safe */ + } + else { + /* ATI frag shader or conventional texturing */ + deferredTexture = GL_TRUE; + } + } + else { + /* no texturing or shadering */ + deferredTexture = GL_FALSE; + } + /* Fragment write masks */ if (span->arrayMask & SPAN_MASK) { /* mask was initialized by caller, probably glBitmap */ span->writeAll = GL_FALSE; |