Merge pull request godotengine#91096 from BastiaanOlij/fix_gles3_shadow_to_opacity

Fix issue in shadow to opacity

Author: akien-mga

drivers/gles3/shaders/scene.glsl

@@ -1859,23 +1859,16 @@ void main() {
 #endif // !MODE_RENDER_DEPTH
 
 #if defined(USE_SHADOW_TO_OPACITY)
+#ifndef MODE_RENDER_DEPTH
 	alpha = min(alpha, clamp(length(ambient_light), 0.0, 1.0));
 
 #if defined(ALPHA_SCISSOR_USED)
 	if (alpha < alpha_scissor) {
 		discard;
 	}
-#else
-#ifdef MODE_RENDER_DEPTH
-#ifdef USE_OPAQUE_PREPASS
-
-	if (alpha < opaque_prepass_threshold) {
-		discard;
-	}
-#endif // USE_OPAQUE_PREPASS
-#endif // MODE_RENDER_DEPTH
 #endif // !ALPHA_SCISSOR_USED
 
+#endif // !MODE_RENDER_DEPTH
 #endif // USE_SHADOW_TO_OPACITY
 
 #ifdef MODE_RENDER_DEPTH

servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl

@@ -2235,24 +2235,16 @@ void fragment_shader(in SceneData scene_data) {
 	}
 
 #ifdef USE_SHADOW_TO_OPACITY
+#ifndef MODE_RENDER_DEPTH
 	alpha = min(alpha, clamp(length(ambient_light), 0.0, 1.0));
 
 #if defined(ALPHA_SCISSOR_USED)
 	if (alpha < alpha_scissor) {
 		discard;
 	}
-#else
-#ifdef MODE_RENDER_DEPTH
-#ifdef USE_OPAQUE_PREPASS
-
-	if (alpha < scene_data.opaque_prepass_threshold) {
-		discard;
-	}
-
-#endif // USE_OPAQUE_PREPASS
-#endif // MODE_RENDER_DEPTH
 #endif // ALPHA_SCISSOR_USED
 
+#endif // !MODE_RENDER_DEPTH
 #endif // USE_SHADOW_TO_OPACITY
 
 #endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

servers/rendering/renderer_rd/shaders/forward_mobile/scene_forward_mobile.glsl

@@ -1756,24 +1756,16 @@ void main() {
 	} //spot lights
 
 #ifdef USE_SHADOW_TO_OPACITY
+#ifndef MODE_RENDER_DEPTH
 	alpha = min(alpha, clamp(length(ambient_light), 0.0, 1.0));
 
 #if defined(ALPHA_SCISSOR_USED)
 	if (alpha < alpha_scissor) {
 		discard;
 	}
-#else
-#ifdef MODE_RENDER_DEPTH
-#ifdef USE_OPAQUE_PREPASS
-
-	if (alpha < scene_data.opaque_prepass_threshold) {
-		discard;
-	}
-
-#endif // USE_OPAQUE_PREPASS
-#endif // MODE_RENDER_DEPTH
 #endif // !ALPHA_SCISSOR_USED
 
+#endif // !MODE_RENDER_DEPTH
 #endif // USE_SHADOW_TO_OPACITY
 
 #endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)