Fix FBO_*() usage when framebuffers are unavailable or undesired.

code/rend2/tr_backend.c

@@ -815,6 +815,7 @@ void RB_RenderDrawSurfList( drawSurf_t *drawSurfs, int numDrawSurfs ) {
 	}
 #endif
 
+	if (glRefConfig.framebufferObject)
 		FBO_Bind(fbo);
 
 	// go back to the world modelview matrix
@@ -1193,12 +1194,12 @@ const void	*RB_DrawSurfs( const void *data ) {
 	// clear the z buffer, set the modelview, etc
 	RB_BeginDrawingView ();
 
-	if ((backEnd.viewParms.flags & VPF_DEPTHCLAMP) && glRefConfig.depthClamp)
+	if (glRefConfig.framebufferObject && (backEnd.viewParms.flags & VPF_DEPTHCLAMP) && glRefConfig.depthClamp)
 	{
 		qglEnable(GL_DEPTH_CLAMP);
 	}
 
-	if (!(backEnd.refdef.rdflags & RDF_NOWORLDMODEL) && (r_depthPrepass->integer || (backEnd.viewParms.flags & VPF_DEPTHSHADOW)))
+	if (glRefConfig.framebufferObject && !(backEnd.refdef.rdflags & RDF_NOWORLDMODEL) && (r_depthPrepass->integer || (backEnd.viewParms.flags & VPF_DEPTHSHADOW)))
 	{
 		FBO_t *oldFbo = glState.currentFBO;
 
@@ -1416,7 +1417,7 @@ const void	*RB_DrawSurfs( const void *data ) {
 		SetViewportAndScissor();
 	}
 
-	if ((backEnd.viewParms.flags & VPF_DEPTHCLAMP) && glRefConfig.depthClamp)
+	if (glRefConfig.framebufferObject && (backEnd.viewParms.flags & VPF_DEPTHCLAMP) && glRefConfig.depthClamp)
 	{
 		qglDisable(GL_DEPTH_CLAMP);
 	}
@@ -1435,8 +1436,8 @@ const void	*RB_DrawSurfs( const void *data ) {
 		RB_RenderFlares();
 	}
 
-	if (glRefConfig.framebufferObject)
+	//if (glRefConfig.framebufferObject)
-		FBO_Bind(NULL);
+		//FBO_Bind(NULL);
 
 	return (const void *)(cmd + 1);
 }
@@ -1453,6 +1454,9 @@ const void	*RB_DrawBuffer( const void *data ) {
 
 	cmd = (const drawBufferCommand_t *)data;
 
+	if (glRefConfig.framebufferObject)
+		FBO_Bind(NULL);
+
 	qglDrawBuffer( cmd->buffer );
 
 	// clear screen for debugging
@@ -1564,6 +1568,8 @@ const void *RB_ClearDepth(const void *data)
 	if (r_showImages->integer)
 		RB_ShowImages();
 
+	if (glRefConfig.framebufferObject)
+	{
 		if (backEnd.framePostProcessed && (backEnd.refdef.rdflags & RDF_NOWORLDMODEL))
 		{
 			FBO_Bind(tr.screenScratchFbo);
@@ -1572,6 +1578,8 @@ const void *RB_ClearDepth(const void *data)
 		{
 			FBO_Bind(tr.renderFbo);
 		}
+	}
+
 	qglClear(GL_DEPTH_BUFFER_BIT);
 
 	// if we're doing MSAA, clear the depth texture for the resolve buffer

code/rend2/tr_cmds.c

@@ -499,11 +499,6 @@ void RE_BeginFrame( stereoFrame_t stereoFrame ) {
 				backEnd.colorMask[3] = GL_FALSE;
 				qglClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 								
-				qglDrawBuffer(GL_FRONT);
-				qglClear(GL_COLOR_BUFFER_BIT);
-				qglDrawBuffer(GL_BACK);
-				qglClear(GL_COLOR_BUFFER_BIT);
-				
 				if (glRefConfig.framebufferObject)
 				{
 					// clear all framebuffers
@@ -530,15 +525,17 @@ void RE_BeginFrame( stereoFrame_t stereoFrame ) {
 								break;
 						}
 
-						qglDrawBuffer(GL_FRONT);
-						qglClear(GL_COLOR_BUFFER_BIT);
-						qglDrawBuffer(GL_BACK);
 						qglClear(GL_COLOR_BUFFER_BIT);
 					}
 
 					FBO_Bind(NULL);
 				}
 
+				qglDrawBuffer(GL_FRONT);
+				qglClear(GL_COLOR_BUFFER_BIT);
+				qglDrawBuffer(GL_BACK);
+				qglClear(GL_COLOR_BUFFER_BIT);
+
 				r_anaglyphMode->modified = qfalse;
 			}
 			

code/rend2/tr_fbo.c

@@ -795,7 +795,7 @@ void FBO_FastBlit(FBO_t *src, vec4i_t srcBox, FBO_t *dst, vec4i_t dstBox, int bu
 	}
 
 	// get to a neutral state first
-	FBO_Bind(NULL);
+	//FBO_Bind(NULL);
 
 	srcFb = src ? src->frameBuffer : 0;
 	dstFb = dst ? dst->frameBuffer : 0;

code/rend2/tr_image.c

@@ -2919,6 +2919,7 @@ void R_CreateBuiltinImages( void ) {
 	R_CreateDlightImage();
 	R_CreateFogImage();
 
+	if (glRefConfig.framebufferObject)
 	{
 		int width, height, hdrFormat;
 
@@ -3001,19 +3002,18 @@ void R_CreateBuiltinImages( void ) {
 			tr.screenSsaoImage = R_CreateImage("*screenSsao", NULL, width / 2, height / 2, IMGTYPE_COLORALPHA, IMGFLAG_NO_COMPRESSION | IMGFLAG_CLAMPTOEDGE, GL_RGBA8);
 			tr.hdrDepthImage = R_CreateImage("*hdrDepth", NULL, width, height, IMGTYPE_COLORALPHA, IMGFLAG_NO_COMPRESSION | IMGFLAG_CLAMPTOEDGE, GL_INTENSITY32F_ARB);
 		}
-	}
 
 		for( x = 0; x < MAX_DRAWN_PSHADOWS; x++)
 		{
 			tr.pshadowMaps[x] = R_CreateImage(va("*shadowmap%i", x), NULL, PSHADOW_MAP_SIZE, PSHADOW_MAP_SIZE, IMGTYPE_COLORALPHA, IMGFLAG_NO_COMPRESSION | IMGFLAG_CLAMPTOEDGE, GL_RGBA8);
 		}
 
-	//tr.sunShadowImage = R_CreateImage("*sunshadowmap", NULL, SUNSHADOW_MAP_SIZE, SUNSHADOW_MAP_SIZE, IMGTYPE_COLORALPHA, IMGFLAG_NO_COMPRESSION | IMGFLAG_CLAMPTOEDGE, GL_RGBA8);
 		for ( x = 0; x < 3; x++)
 		{
 			tr.sunShadowDepthImage[x] = R_CreateImage(va("*sunshadowdepth%i", x), NULL, r_shadowMapSize->integer, r_shadowMapSize->integer, IMGTYPE_COLORALPHA, IMGFLAG_NO_COMPRESSION | IMGFLAG_CLAMPTOEDGE, GL_DEPTH_COMPONENT24_ARB);
 		}
 	}
+}
 
 
 /*

code/rend2/tr_init.c

@@ -1411,6 +1411,7 @@ void R_Init( void ) {
 
 	R_InitImages();
 
+	if (glRefConfig.framebufferObject)
 		FBO_Init();
 
 	GLSL_InitGPUShaders();
@@ -1463,6 +1464,7 @@ void RE_Shutdown( qboolean destroyWindow ) {
 		R_SyncRenderThread();
 		R_ShutdownCommandBuffers();
 		R_ShutDownQueries();
+		if (glRefConfig.framebufferObject)
 			FBO_Shutdown();
 		R_DeleteTextures();
 		R_ShutdownVBOs();

code/rend2/tr_scene.c

@@ -476,13 +476,13 @@ void RE_RenderScene( const refdef_t *fd ) {
 	}
 
 	/* playing with more shadows */
-	if(!( fd->rdflags & RDF_NOWORLDMODEL ) && r_shadows->integer == 4)
+	if(glRefConfig.framebufferObject && !( fd->rdflags & RDF_NOWORLDMODEL ) && r_shadows->integer == 4)
 	{
 		R_RenderPshadowMaps(fd);
 	}
 
 	// playing with even more shadows
-	if(!( fd->rdflags & RDF_NOWORLDMODEL ) && (r_forceSun->integer || tr.sunShadows))
+	if(glRefConfig.framebufferObject && !( fd->rdflags & RDF_NOWORLDMODEL ) && (r_forceSun->integer || tr.sunShadows))
 	{
 		R_RenderSunShadowMaps(fd, 0);
 		R_RenderSunShadowMaps(fd, 1);

code/rend2/tr_shade.c

@@ -1713,7 +1713,7 @@ void RB_StageIteratorGeneric( void )
 	//
 	// pshadows!
 	//
-	if ( tess.pshadowBits && tess.shader->sort <= SS_OPAQUE
+	if (glRefConfig.framebufferObject && tess.pshadowBits && tess.shader->sort <= SS_OPAQUE
 		&& !(tess.shader->surfaceFlags & (SURF_NODLIGHT | SURF_SKY) ) ) {
 		ProjectPshadowVBOGLSL();
 	}