From d5e579f78bb8ff968dce364c15398511c37360c8 Mon Sep 17 00:00:00 2001
From: Christophe Geuzaine <cgeuzaine@ulg.ac.be>
Date: Fri, 4 Jun 2004 03:05:59 +0000
Subject: [PATCH] comment to explain the blending modes
---
Graphics/Post.cpp | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/Graphics/Post.cpp b/Graphics/Post.cpp
index b19e6a5140..3f1cee0209 100644
--- a/Graphics/Post.cpp
+++ b/Graphics/Post.cpp
@@ -1,4 +1,4 @@
-// $Id: Post.cpp,v 1.68 2004-06-04 02:07:07 geuzaine Exp $
+// $Id: Post.cpp,v 1.69 2004-06-04 03:05:59 geuzaine Exp $
//
// Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
//
@@ -409,18 +409,19 @@ void Draw_Post(void)
// initialize alpha blending for transparency
if(CTX.alpha && ColorTable_IsAlpha(&v->CT)){
- if(CTX.fake_transparency){ // "a la xpost"
+ if(CTX.fake_transparency){
+ // simple additive blending "a la xpost"
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
}
else{
+ // real translucent blending (requires back-to-front traversal)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
- // if we don't use vertex arrays, do a simple sort of
- // transparent views (hybrid views will be sorted incorrectly;
- // use Plugin(DecomposeInSimplex) and View->Combine to do remedy
- // this limitation)
+ // if we don't use vertex arrays, do the sorting here - it's
+ // incorrect for hybrid views (use Plugin(DecomposeInSimplex)
+ // for that)
if(!CTX.post.vertex_arrays && v->DrawScalars &&
(changedEye() || v->Changed)) {
Msg(DEBUG, "Sorting View[%d] for transparency (NO vertex array)", v->Index);
--
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