Specgloss shaders improvements + experimental SSAO (debug only)

shaders/envmapping.glsl

@@ -13,3 +13,16 @@ vec3 envmap_color( vec3 normal )
 #endif
 	return envcolor;
 }
+
+// Roughness-aware env map lookup — uses mip levels for blurry reflections.
+// lod 0.0 = mirror sharp, lod ~8.0 = fully diffuse blur.
+vec3 envmap_color_lod(vec3 fragnormal, float lod)
+{
+#if ENVMAP_ENABLED
+    vec3 refvec = reflect(f_pos.xyz, fragnormal); // view space — matches envmap_color exactly
+    refvec = vec3(inv_view * vec4(refvec, 0.0));  // world space — was missing
+    return textureLod(envmap, refvec, lod).rgb;
+#else
+    return vec3(0.5); // was vec3(0.0), match the non-LOD fallback
+#endif
+}