Avoid creating useless liquidMapping FBO

Author: slipher

src/engine/renderer/tr_fbo.cpp

@@ -451,11 +451,11 @@ void R_InitFBOs()
 		R_CheckFBO( tr.lighttileFBO );
 	}
 
+	if ( r_liquidMapping->integer )
 	{
 		width = windowConfig.vidWidth;
 		height = windowConfig.vidHeight;
 
-		// portalRender FBO for portals, mirrors, water, cameras et cetera
 		tr.portalRenderFBO = R_CreateFBO( "_portalRender", width, height );
 		R_BindFBO( tr.portalRenderFBO );
 

src/engine/renderer/tr_image.cpp

@@ -2607,6 +2607,11 @@ static void R_CreateDepthRenderImage()
 
 static void R_CreatePortalRenderImage()
 {
+	if ( !r_liquidMapping->integer )
+	{
+		return;
+	}
+
 	int  width, height;
 
 	width = windowConfig.vidWidth;

src/engine/renderer/tr_local.h

@@ -2469,7 +2469,7 @@ enum
 		FBO_t *depthtile1FBO;
 		FBO_t *depthtile2FBO;
 		FBO_t *lighttileFBO;
-		FBO_t *portalRenderFBO; // holds a copy of the last currentRender that was rendered into a FBO
+		FBO_t *portalRenderFBO; // used with liquidMapping shader
 		FBO_t *contrastRenderFBO;
 		FBO_t *bloomRenderFBO[ 2 ];