Grok EFB pixel format to determine whether render target has alpha, thus fixing the "Stage Clear" screen in SSBM.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3588 8ced0084-cf51-0410-be5f-012b33b47a6e

1 files changed, 11 insertions, 0 deletions

diff --git a/Source/Plugins/Plugin_VideoOGL/Src/FramebufferManager.cpp b/Source/Plugins/Plugin_VideoOGL/Src/FramebufferManager.cpp
index 49f804b91a..1c531db68d 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/FramebufferManager.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/FramebufferManager.cpp
@@ -25,6 +25,17 @@ void FramebufferManager::Init(int targetWidth, int targetHeight, int msaaSamples
 	m_msaaSamples = msaaSamples;

 	m_msaaCoverageSamples = msaaCoverageSamples;

 

+	// The EFB can be set to different pixel formats by the game through the

+	// BPMEM_ZCOMPARE register (which should probably have a different name).

+	// They are:

+	// - 24-bit RGB (8-bit components) with 24-bit Z

+	// - 24-bit RGBA (6-bit components) with 24-bit Z

+	// - Multisampled 16-bit RGB (5-6-5 format) with 16-bit Z

+	// We only use one EFB format here: 32-bit ARGB with 24-bit Z.

+	// Multisampling depends on user settings.

+	// The distinction becomes important for certain operations, i.e. the

+	// alpha channel should be ignored if the EFB does not have one.

+

 	// Create EFB target.

 

 	glGenFramebuffersEXT(1, &m_efbFramebuffer);