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we actually have to saturate when doing premultilied blending with opengl

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This commit is contained in:
Mathias Agopian 2009-08-07 13:01:46 -07:00
parent 6bc6794f97
commit 665a2227e5
1 changed files with 1 additions and 11 deletions
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12
libpixelflinger/codeflinger/blending.cpp
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@ -221,17 +221,7 @@ void GGLAssembler::build_blending(
build_blend_factor(dst_factor, fd,
component, pixel, fragment, fb, scratches);
mul_factor_add(temp, fb, dst_factor, component_t(fragment));
if (fd==GGL_ONE_MINUS_SRC_ALPHA) {
// XXX: in theory this is not correct, we should
// saturate here. However, this mode is often
// used for displaying alpha-premultiplied graphics,
// in which case, saturation is not necessary.
// unfortunatelly, we have no way to know.
// This is a case, where we sacrifice correctness for
// performance. we should probably have some heuristics.
} else {
component_sat(temp);
}
component_sat(temp);
}
} else {
// compute fs