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gsdx: no depth lookup optimization 

Don't lookup a depth buffer if depth test is always pass without write

Boost performance on Tekken5 when depth emulation is enabled in openGL
(Tekken5 sets same address for both the RT and the depth but depth is disabled)

v2:
Keep ds if DATE is enabled (some implementation uses a stencil buffer)
Be more aggressive to avoid an useless depth lookup
This commit is contained in:
Gregory Hainaut 2016-02-17 19:58:27 +01:00
parent 44e6445180
commit 1853d0d16d
1 changed files with 6 additions and 1 deletions
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7
plugins/GSdx/GSRendererHW.cpp
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@ -342,7 +342,12 @@ void GSRendererHW::Draw()
// 3/ 50cents really draws (0,0,0,128) color and a (0) 24 bits depth
// Note: FF DoC has both buffer at same location but disable the depth test (write?) with ZTE = 0
const bool no_rt = (context->ALPHA.IsCd() && PRIM->ABE && (context->FRAME.PSM == 1));
const bool no_ds = !no_rt && (context->FRAME.FBP == context->ZBUF.ZBP && !PRIM->TME && !context->ZBUF.ZMSK && !context->FRAME.FBMSK && context->TEST.ZTE);
const bool no_ds = !no_rt && (
// Depth is always pass (no read) and write are discarded (tekken 5). (Note: DATE is currently implemented with a stencil buffer)
(context->ZBUF.ZMSK && m_context->TEST.ZTST == ZTST_ALWAYS && !m_context->TEST.DATE) ||
// Depth will be written through the RT
(context->FRAME.FBP == context->ZBUF.ZBP && !PRIM->TME && !context->ZBUF.ZMSK && !context->FRAME.FBMSK && context->TEST.ZTE)
);
GIFRegTEX0 TEX0;