Cleanup and render-to-texture tweaks.

Added two new debug render modes
Fixed bizarre issue with line-widths being sporadically inconsistent in ui. (needs glFlush for some reason)

indra/newview/llviewerdisplay.cpp

@@ -119,7 +119,6 @@ void render_hud_attachments();
 void render_ui_3d();
 void render_ui_2d();
 void render_disconnected_background();
-void render_hud_elements();
 
 void display_startup()
 {
@@ -681,9 +680,7 @@ void display(BOOL rebuild, F32 zoom_factor, int subfield, BOOL for_snapshot)
 		LLGLState::checkTextureChannels();
 		LLGLState::checkClientArrays();
 
-		BOOL to_texture = !for_snapshot &&
-						gPipeline.canUseVertexShaders() &&
-						LLPipeline::sRenderGlow;
+		BOOL to_texture = gPipeline.canUseVertexShaders() && (LLPipeline::sRenderDeferred ||	LLPipeline::sRenderGlow);
 
 		LLAppViewer::instance()->pingMainloopTimeout("Display:Swap");