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authorBrian <brian.paul@tungstengraphics.com>2007-05-21 08:57:18 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-05-21 08:57:18 -0600
commita8676c45ccab52117c70f2e90fd820d745261f51 (patch)
treeccb2f3a5f82d1063577de5b0f39602e9299ce95f
parent9e8a961dd7d7b717a9fb4ecdea1c1b60ea355efe (diff)
if light position is local, treat it as a homogeneous coord and divide by W (see bug 11009)
-rw-r--r--src/mesa/main/light.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/mesa/main/light.c b/src/mesa/main/light.c
index 92d8a0ae0d..6e057614ba 100644
--- a/src/mesa/main/light.c
+++ b/src/mesa/main/light.c
@@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
- * Version: 6.5.3
+ * Version: 7.0
*
- * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -1117,6 +1117,13 @@ compute_light_positions( GLcontext *ctx )
}
light->_VP_inf_spot_attenuation = 1.0;
}
+ else {
+ /* positional light w/ homogeneous coordinate, divide by W */
+ GLfloat wInv = 1.0 / light->_Position[3];
+ light->_Position[0] *= wInv;
+ light->_Position[1] *= wInv;
+ light->_Position[2] *= wInv;
+ }
if (light->_Flags & LIGHT_SPOT) {
if (ctx->_NeedEyeCoords) {