From 32dc31f3daa08eae11ea8541f02864dd0144db81 Mon Sep 17 00:00:00 2001
From: Sonicadvance1 <sonicadvance1@gmail.com>
Date: Fri, 28 Nov 2008 13:23:29 +0000
Subject: [PATCH] Committing my current work on Anti-Aliasing for the GL
 plugin. It works, but it's slow, really slow. I got 1-2FPS in JIT with it
 enabled. Maybe Windows would be faster, I'm not sure. It's highly
 experimental and shouldn't be used yet, since some games don't work with it.
 Like Super Smash Brother's Melee in game.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1320 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Plugins/Plugin_VideoOGL/Src/Render.cpp | 34 ++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp b/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
index b962d6cac0..bc437f227f 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
@@ -51,7 +51,7 @@
 #include "OS/Win32.h"
 #else
 #endif
-
+//#define USE_AA
 struct MESSAGE
 {
     MESSAGE() {}
@@ -71,6 +71,7 @@ static RasterFont* s_pfont = NULL;
 static std::list<MESSAGE> s_listMsgs;
 static bool s_bFullscreen = false;
 static bool s_bOutputCgErrors = true;
+
 static int nZBufferRender = 0; // if > 0, then using zbuffer render
 static u32 s_uFramebuffer = 0;
 static u32 s_RenderTargets[1] = {0}, s_DepthTarget = 0, s_ZBufferTarget = 0;
@@ -185,6 +186,10 @@ bool Renderer::Create2()
         }
         glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
         glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        #ifdef USE_AA
+        glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, s_RenderTargets[i]);
+        glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, 4, GL_RGBA, nBackbufferWidth, nBackbufferHeight);
+        #endif
     }
     s_nCurTarget = 0;
 
@@ -208,12 +213,21 @@ bool Renderer::Create2()
         }
         glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
         glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        #ifdef USE_AA
+        glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, s_ZBufferTarget);
+        glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, 4, GL_RGBA, nBackbufferWidth, nBackbufferHeight);
+        #endif
     }
 
     // create the depth buffer
     glGenRenderbuffersEXT( 1, (GLuint *)&s_DepthTarget);
     glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, s_DepthTarget);
+    #ifdef USE_AA
+    glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, 4, GL_DEPTH24_STENCIL8_EXT, nBackbufferWidth, nBackbufferHeight);
+    #else
     glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, nBackbufferWidth, nBackbufferHeight);
+    #endif
+    
     if (glGetError() != GL_NO_ERROR) {
         glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, nBackbufferWidth, nBackbufferHeight);
         s_bHaveStencilBuffer = false;
@@ -226,6 +240,13 @@ bool Renderer::Create2()
     // set as render targets
     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_ARB, s_RenderTargets[s_nCurTarget], 0 );
     glFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, s_DepthTarget );
+    
+    #ifdef USE_AA
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, s_RenderTargets[s_nCurTarget]);
+    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, s_RenderTargets[s_nCurTarget]);
+    
+    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, s_DepthTarget);
+    #endif
     GL_REPORT_ERROR();
 
     if (s_ZBufferTarget != 0) {
@@ -703,7 +724,11 @@ void Renderer::Swap(const TRectangle& rc)
     Renderer::SetRenderMode(Renderer::RM_Normal);
 
     // render to the real buffer now 
+    #ifdef USE_AA
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, s_RenderTargets[0]);
+    #else
     glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 ); // switch to the backbuffer
+    #endif
     glViewport(nXoff, nYoff, nBackbufferWidth, nBackbufferHeight);
 
     ResetGLState();
@@ -733,6 +758,13 @@ void Renderer::Swap(const TRectangle& rc)
     SwapBuffers();
 
     RestoreGLState();
+    #ifdef USE_AA
+	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, s_RenderTargets[s_nCurTarget]);
+	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
+	glBlitFramebufferEXT(0, 0, nBackbufferWidth, nBackbufferHeight, 0, 0, nBackbufferWidth, nBackbufferHeight, GL_COLOR_BUFFER_BIT, GL_LINEAR);
+	
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+	#endif
     GL_REPORT_ERRORD();
 
     g_Config.iSaveTargetId = 0;