From e7c735418fad0df613f79507a2f0a87381a72e87 Mon Sep 17 00:00:00 2001
From: plagman <plagman@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Sun, 2 Oct 2011 03:09:20 +0000
Subject: [PATCH] Polymer: Fix upside-down projective textures

We need to Y-invert the projection texcoords when sampling
from the lightmap.

git-svn-id: https://svn.eduke32.com/eduke32@2055 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/eduke32/build/src/polymer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/polymer/eduke32/build/src/polymer.c b/polymer/eduke32/build/src/polymer.c
index b5283f77b..bd5625900 100644
--- a/polymer/eduke32/build/src/polymer.c
+++ b/polymer/eduke32/build/src/polymer.c
@@ -456,7 +456,7 @@ _prprogrambit   prprogrambits[PR_BIT_COUNT] = {
         "uniform sampler2D lightMap;\n"
         "\n",
         // frag_prog
-        "  lightTexel = texture2D(lightMap, gl_TexCoord[2].st / gl_TexCoord[2].q).rgb;\n"
+        "  lightTexel = texture2D(lightMap, vec2(gl_TexCoord[2].s, -gl_TexCoord[2].t) / gl_TexCoord[2].q).rgb;\n"
         "\n",
     },
     {