#5979: Cubemap support for opengl2.

code/renderergl2/tr_light.c

@@ -449,3 +449,32 @@ int R_LightDirForPoint( vec3_t point, vec3_t lightDir, vec3_t normal, world_t *w
 
 	return qtrue;
 }
+
+
+int R_CubemapForPoint( vec3_t point )
+{
+	int cubemapIndex = -1;
+
+	if (r_cubeMapping->integer && tr.numCubemaps)
+	{
+		int i;
+		vec_t shortest = (float)WORLD_SIZE * (float)WORLD_SIZE;
+
+		for (i = 0; i < tr.numCubemaps; i++)
+		{
+			vec3_t diff;
+			vec_t length;
+
+			VectorSubtract(point, tr.cubemapOrigins[i], diff);
+			length = DotProduct(diff, diff);
+
+			if (shortest > length)
+			{
+				shortest = length;
+				cubemapIndex = i;
+			}
+		}
+	}
+
+	return cubemapIndex + 1;
+}