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Revision: 813
          http://l33t.svn.sourceforge.net/l33t/?rev=813&view=rev
Author:   digiman
Date:     2009-02-07 21:48:37 +0000 (Sat, 07 Feb 2009)

Log Message:
-----------


Added Paths:
-----------
    trunk/qfusion/source/ref_gl/r_framebuffer.c

Added: trunk/qfusion/source/ref_gl/r_framebuffer.c
===================================================================

--- trunk/qfusion/source/ref_gl/r_framebuffer.c	                        (rev 0)
+++ trunk/qfusion/source/ref_gl/r_framebuffer.c	2009-02-07 21:48:37 UTC (rev 813)
@@ -0,0 +1,270 @@
+/*
+Copyright (C) 2008 Victor Luchits
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+// r_framebuffer.c - Framebuffer Objects support
+
+#include "r_local.h"
+
+#define MAX_FRAMEBUFFER_OBJECTS	    1024
+
+typedef struct
+{
+	int objectID;
+	int renderBufferAttachment;
+	image_t *textureAttachment;
+} r_fbo_t;
+
+static qboolean r_frambuffer_objects_initialized;
+static int r_bound_framebuffer_object;
+static int r_num_framebuffer_objects;
+static r_fbo_t r_framebuffer_objects[MAX_FRAMEBUFFER_OBJECTS];
+
+/*
+================
+R_InitFBObjects
+================
+*/
+void R_InitFBObjects( void )
+{
+	if( !glConfig.ext.framebuffer_object )
+		return;
+
+	r_num_framebuffer_objects = 0;
+	memset( r_framebuffer_objects, 0, sizeof( r_framebuffer_objects ) );
+
+	qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
+	r_bound_framebuffer_object = 0;
+
+	r_frambuffer_objects_initialized = qtrue;
+}
+
+/*
+================
+R_DeleteFBObject
+
+Delete framebuffer object along with attached render buffer
+================
+*/
+static void R_DeleteFBObject( r_fbo_t *fbo )
+{
+	GLuint t;
+
+	if( fbo->renderBufferAttachment )
+	{
+		t = fbo->renderBufferAttachment;
+		qglDeleteRenderbuffersEXT( 1, &t );
+		fbo->renderBufferAttachment = 0;
+	}
+
+	if( fbo->objectID )
+	{
+		t = fbo->objectID;
+		qglDeleteFramebuffersEXT( 1, &t );
+		fbo->objectID = 0;
+	}
+}
+
+/*
+================
+R_RegisterFBObject
+================
+*/
+int R_RegisterFBObject( void )
+{
+	int i;
+	GLuint fbID;
+	r_fbo_t *fbo;
+
+	if( !r_frambuffer_objects_initialized )
+		return 0;
+	if( r_num_framebuffer_objects == MAX_FRAMEBUFFER_OBJECTS )
+	{
+		Com_Printf( S_COLOR_YELLOW "R_RegisterFBObject: framebuffer objects limit exceeded\n" );
+		return 0;
+	}
+
+	qglGenFramebuffersEXT( 1, &fbID );
+
+	i = r_num_framebuffer_objects++;
+	fbo = r_framebuffer_objects + i;
+	memset( fbo, 0, sizeof( *fbo ) );
+	fbo->objectID = fbID;
+
+	return i+1;
+}
+
+/*
+================
+R_ActiveFBObject
+================
+*/
+int R_ActiveFBObject( void )
+{
+	return r_bound_framebuffer_object;
+}
+
+/*
+================
+R_UseFBObject
+================
+*/
+qboolean R_UseFBObject( int object )
+{
+	qboolean status;
+
+	if( !object )
+	{
+		if( r_frambuffer_objects_initialized )
+			qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
+		r_bound_framebuffer_object = 0;
+
+		return r_frambuffer_objects_initialized;
+	}
+
+	assert( object > 0 && object <= r_num_framebuffer_objects );
+
+	qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, r_framebuffer_objects[object-1].objectID );
+	r_bound_framebuffer_object = object;
+
+	status = R_CheckFBObjectStatus ();
+
+	return status;
+}
+
+/*
+================
+R_AttachTextureToFBOject
+================
+*/
+qboolean R_AttachTextureToFBOject( int object, image_t *texture, qboolean depthOnly )
+{
+	r_fbo_t *fbo;
+	qboolean status;
+
+	if( !object )
+		return qfalse;
+	if( !r_frambuffer_objects_initialized )
+		return qfalse;
+
+	assert( object > 0 && object <= r_num_framebuffer_objects );
+	assert( texture );
+
+	fbo = r_framebuffer_objects + object - 1;
+
+	qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fbo->objectID );
+
+	if( depthOnly )
+	{
+        // Set up depth_tex for render-to-texture
+		qglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, texture->texnum, 0 );
+
+		// inform the driver we do not wish to render to the color buffer
+		qglDrawBuffer( GL_NONE );
+		qglReadBuffer( GL_NONE );
+	}
+	else
+	{
+		// initialize depth renderbuffer
+		if( !fbo->renderBufferAttachment )
+		{
+			GLuint rbID;
+			qglGenRenderbuffersEXT( 1, &rbID );
+			fbo->renderBufferAttachment = rbID;
+		}
+
+		// setup 24bit depth buffer for render-to-texture
+		qglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, fbo->renderBufferAttachment );
+		qglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24,
+			texture->upload_width, texture->upload_height );
+		qglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0 );
+
+		// attach depth renderbuffer
+		qglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, 
+			GL_RENDERBUFFER_EXT, fbo->renderBufferAttachment );
+
+		// attach texture
+		qglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+			(texture->upload_depth != 1 ? GL_TEXTURE_3D : GL_TEXTURE_2D), texture->texnum, 0 );
+		fbo->textureAttachment = texture;
+	}
+
+	status = R_CheckFBObjectStatus ();
+
+	if( r_bound_framebuffer_object )
+		qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, r_framebuffer_objects[r_bound_framebuffer_object-1].objectID );
+	else
+		qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
+
+	return status;
+}
+
+/*
+================
+R_CheckFBObjectStatus
+
+Boolean, returns qfalse in case of error
+================
+*/
+qboolean R_CheckFBObjectStatus( void )
+{
+	GLenum status;
+
+	if( !r_frambuffer_objects_initialized )
+		return qfalse;
+
+	status = qglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
+	switch( status )
+	{
+		case GL_FRAMEBUFFER_COMPLETE_EXT:
+			return qtrue;
+		case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
+			return qfalse;
+		default:
+			// programming error; will fail on all hardware
+			assert( 0 );
+	}
+	
+	return qfalse;
+}
+
+/*
+================
+R_ShutdownFBObjects
+
+Delete all registered framebuffer and render buffer objects, clear memory
+================
+*/
+void R_ShutdownFBObjects( void )
+{
+	int i;
+
+	if( !r_frambuffer_objects_initialized )
+		return;
+
+	for( i = 0; i < r_num_framebuffer_objects; i++ )
+		R_DeleteFBObject( r_framebuffer_objects + i );
+
+	qglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
+	r_bound_framebuffer_object = 0;
+
+	r_frambuffer_objects_initialized = qfalse;
+	r_num_framebuffer_objects = 0;
+	memset( r_framebuffer_objects, 0, sizeof( r_framebuffer_objects ) );
+}


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