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gsdx-ogl: small optimization for the GPU 

Gain: 1% at 4x on SotC (it partially compensates recent additions)

When the color is constant and equal to 128, the MODULATE mode is
equivalent to the DECAL mode. It saves 5 instructions on the FS.
This commit is contained in:
Gregory Hainaut 2015-07-20 19:35:30 +02:00
parent 7ca463bf75
commit cb4af8fe83
1 changed files with 9 additions and 1 deletions
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10
plugins/GSdx/GSRendererOGL.cpp
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@ -669,8 +669,16 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
ps_sel.fmt = cpsm.fmt;
}
ps_sel.aem = env.TEXA.AEM;
ps_sel.tfx = context->TEX0.TFX;
if (context->TEX0.TFX == TFX_MODULATE && m_vt.m_eq.rgba == 0xFFFF && m_vt.m_min.c.eq(GSVector4i(128))) {
// Micro optimization that reduces GPU load (removes 5 instructions on the FS program)
ps_sel.tfx = TFX_DECAL;
} else {
ps_sel.tfx = context->TEX0.TFX;
}
ps_sel.tcc = context->TEX0.TCC;
ps_sel.ltf = bilinear && !simple_sample;
spritehack = tex->m_spritehack_t;
// FIXME the ati is currently disabled on the shader. I need to find a .gs to test that we got same