Merge pull request godotengine#100677 from clayjohn/light2d-cull

Properly transform light rect and occluder rect to perform Light2D culling in canvas space

Author: akien-mga

drivers/gles3/rasterizer_canvas_gles3.cpp

@@ -857,7 +857,7 @@ void RasterizerCanvasGLES3::_record_item_commands(const Item *p_item, RID p_rend
 		Light *light = p_lights;
 
 		while (light) {
-			if (light->render_index_cache >= 0 && p_item->light_mask & light->item_mask && p_item->z_final >= light->z_min && p_item->z_final <= light->z_max && p_item->global_rect_cache.intersects_transformed(light->xform_cache, light->rect_cache)) {
+			if (light->render_index_cache >= 0 && p_item->light_mask & light->item_mask && p_item->z_final >= light->z_min && p_item->z_final <= light->z_max && p_item->global_rect_cache.intersects(light->rect_cache)) {
 				uint32_t light_index = light->render_index_cache;
 				lights[light_count >> 2] |= light_index << ((light_count & 3) * 8);
 

servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp

@@ -1035,14 +1035,14 @@ void RendererCanvasRenderRD::light_update_shadow(RID p_rid, int p_shadow_index,
 	while (instance) {
 		OccluderPolygon *co = occluder_polygon_owner.get_or_null(instance->occluder);
 
+		occluder_count++;
+
 		if (!co || co->index_array.is_null()) {
 			instance = instance->next;
 			continue;
 		}
 
-		occluder_count++;
-
-		if (!(p_light_mask & instance->light_mask) || !p_light_rect.intersects(instance->aabb_cache)) {
+		if (!(p_light_mask & instance->light_mask) || !p_light_rect.intersects_transformed(instance->xform_cache, instance->aabb_cache)) {
 			instance = instance->next;
 			continue;
 		}
@@ -2353,7 +2353,7 @@ void RendererCanvasRenderRD::_record_item_commands(const Item *p_item, RenderTar
 		Light *light = p_lights;
 
 		while (light) {
-			if (light->render_index_cache >= 0 && p_item->light_mask & light->item_mask && p_item->z_final >= light->z_min && p_item->z_final <= light->z_max && p_item->global_rect_cache.intersects_transformed(light->xform_cache, light->rect_cache)) {
+			if (light->render_index_cache >= 0 && p_item->light_mask & light->item_mask && p_item->z_final >= light->z_min && p_item->z_final <= light->z_max && p_item->global_rect_cache.intersects(light->rect_cache)) {
 				uint32_t light_index = light->render_index_cache;
 				lights[light_count >> 2] |= light_index << ((light_count & 3) * 8);
 

servers/rendering/renderer_viewport.cpp

@@ -413,7 +413,9 @@ void RendererViewport::_draw_viewport(Viewport *p_viewport) {
 						cl->xform_cache = xf * cl->xform_cache;
 					}
 
-					if (clip_rect.intersects_transformed(cl->xform_cache, cl->rect_cache)) {
+					Rect2 temp_rect = cl->xform_cache.xform(cl->rect_cache);
+
+					if (clip_rect.intersects(temp_rect)) {
 						cl->filter_next_ptr = lights;
 						lights = cl;
 						Transform2D scale;
@@ -423,12 +425,13 @@ void RendererViewport::_draw_viewport(Viewport *p_viewport) {
 						if (cl->use_shadow) {
 							cl->shadows_next_ptr = lights_with_shadow;
 							if (lights_with_shadow == nullptr) {
-								shadow_rect = cl->xform_cache.xform(cl->rect_cache);
+								shadow_rect = temp_rect;
 							} else {
-								shadow_rect = shadow_rect.merge(cl->xform_cache.xform(cl->rect_cache));
+								shadow_rect = shadow_rect.merge(temp_rect);
 							}
 							lights_with_shadow = cl;
 							cl->radius_cache = cl->rect_cache.size.length();
+							cl->rect_cache = temp_rect;
 						}
 					}
 				}