Merge pull request #1185 from PCSX2/tekken5-fast-depth

gsdx: no depth lookup optimization

plugins/GSdx/GSRendererHW.cpp

@@ -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;