computeLight_fp: fix compilation when r_highPrecisionRendering is disabled

Author: illwieckz

src/engine/renderer/glsl_source/computeLight_fp.glsl

@@ -177,20 +177,20 @@ int nextIdx( inout idxs_t idxs ) {
   idxs = idxs >> 2;
   return int( tmp.x + tmp.y + tmp.z + tmp.w );
 }
-#else // !HAVE_EXT_texture_integer
+#else // !HAVE_EXT_texture_integer || !r_highPrecisionRendering
 const int lightsPerLayer = 4;
-uniform sampler3D u_LightTiles;
+uniform usampler3D u_LightTilesInt;
 #define idxs_t vec4
-idxs_t fetchIdxs( in vec3 coords ) {
-  return texture3D( u_LightTiles, coords ) * 255.0;
+idxs_t fetchIdxs( in vec3 coords, in usampler3D u_LightTilesInt ) {
+  return texture3D( u_LightTilesInt, coords ) * 255.0;
 }
 int nextIdx( inout idxs_t idxs ) {
   vec4 tmp = idxs;
   idxs = floor(idxs * 0.25);
   tmp -= 4.0 * idxs;
   return int( dot( tmp, vec4( 64.0, 16.0, 4.0, 1.0 ) ) );
 }
-#endif // HAVE_EXT_texture_integer
+#endif // !HAVE_EXT_texture_integer || !r_highPrecisionRendering
 
 const int numLayers = MAX_REF_LIGHTS / 256;