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gsdx ogl: new optimization to bypass the alpha test 

In FB_ONLY mode the alpha test impacts (discard) only the depth value.
If there is no depth buffer, we don't care about depth write. So alpha
test is useless and we can do the draw with a single draw call and no program
switch
This commit is contained in:
Gregory Hainaut 2016-08-15 11:35:24 +02:00
parent b62859ffa2
commit 5fbf702500
1 changed files with 6 additions and 1 deletions
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7
plugins/GSdx/GSRendererOGL.cpp
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@ -1295,8 +1295,13 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
// pass to handle the depth based on the alpha test.
bool complex_ate = ate_first_pass & ate_second_pass;
bool ate_all_color_then_depth = complex_ate & (m_context->TEST.AFAIL == AFAIL_FB_ONLY) & (m_om_dssel.ztst == ZTST_ALWAYS);
// In FB_ONLY mode, only the z buffer is impacted by the alpha test. No depth => useless alpha test
bool ate_skip = complex_ate & (m_context->TEST.AFAIL == AFAIL_FB_ONLY) & (ds == nullptr);
if (ate_all_color_then_depth) {
if (ate_skip) {
GL_INS("Alternate ATE handling: ate_skip");
ate_second_pass = false;
} else if (ate_all_color_then_depth) {
GL_INS("Alternate ATE handling: ate_all_color_then_depth");
// Render all color but don't update depth
// ATE is disabled here