renderlights GL_QUADS->GL_TRIANGLE_FAN for #234

Author: no-lex

src/engine/render/renderlights.cpp

@@ -1929,10 +1929,10 @@ VAR(depthfaillights, 0, 1, 1);
 
 static void lightquads(float z, float sx1, float sy1, float sx2, float sy2)
 {
+    gle::attribf(sx1, sy1, z);
     gle::attribf(sx1, sy2, z);
     gle::attribf(sx2, sy2, z);
     gle::attribf(sx2, sy1, z);
-    gle::attribf(sx1, sy1, z);
 }
 
 static void lightquads(float z, float sx1, float sy1, float sx2, float sy2, int tx1, int ty1, int tx2, int ty2)
@@ -1987,7 +1987,7 @@ static void lightquad(float sz1, float bsx1, float bsy1, float bsx2, float bsy2,
     int btx1, bty1, btx2, bty2;
     calctilebounds(bsx1, bsy1, bsx2, bsy2, btx1, bty1, btx2, bty2);
 
-    gle::begin(GL_QUADS);
+    gle::begin(GL_TRIANGLE_FAN);
     lightquads(sz1, bsx1, bsy1, bsx2, bsy2, btx1, bty1, btx2, bty2, tilemask);
     gle::end();
 }