Change destination alpha handling. The blending method introduced in rev 1921 was not the correct way to do it. This way was suggested by hrydgard in October and I should have listened. A simple pixel shader as hrydgard suggested cannot be used because the alpha is not set if the pixel is discarded due to failing depth (after z texture) or alpha (result of tev stages) tests. There is a bit of a performance hit so there should be an option to disable the second render pass which sets the alpha because it is probably not needed most of the time.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2662 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoOGL/Src/PixelShaderCache.h

@@ -58,7 +58,7 @@ public:
 	static void ProgressiveCleanup();
 	static void Shutdown();
 
-	static FRAGMENTSHADER* GetShader();
+	static FRAGMENTSHADER* GetShader(bool dstAlphaEnable);
 	static bool CompilePixelShader(FRAGMENTSHADER& ps, const char* pstrprogram);
 
 	static GLuint GetColorMatrixProgram();