Fix reflection probes not recreating downsampled textures when mode changes.

Author: DarioSamo

servers/rendering/renderer_rd/storage_rd/light_storage.cpp

@@ -1495,12 +1495,15 @@ bool LightStorage::reflection_probe_instance_begin_render(RID p_instance, RID p_
 
 	RD::get_singleton()->draw_command_begin_label("Reflection probe render");
 
-	if (LightStorage::get_singleton()->reflection_probe_get_update_mode(rpi->probe) == RS::REFLECTION_PROBE_UPDATE_ALWAYS && atlas->reflection.is_valid() && atlas->size != 256) {
+	const bool update_always = LightStorage::get_singleton()->reflection_probe_get_update_mode(rpi->probe) == RS::REFLECTION_PROBE_UPDATE_ALWAYS;
+	if (update_always && atlas->reflection.is_valid() && atlas->size != 256) {
 		WARN_PRINT("ReflectionProbes set to UPDATE_ALWAYS must have an atlas size of 256. Please update the atlas size in the ProjectSettings.");
 		reflection_atlas_set_size(p_reflection_atlas, 256, atlas->count);
 	}
 
-	if (LightStorage::get_singleton()->reflection_probe_get_update_mode(rpi->probe) == RS::REFLECTION_PROBE_UPDATE_ALWAYS && atlas->reflection.is_valid() && atlas->reflections[0].data.layers[0].mipmaps.size() != 8) {
+	const bool update_mode_changed = atlas->update_always != update_always && atlas->reflection.is_valid();
+	const bool real_time_mipmaps_different = update_always && atlas->reflection.is_valid() && atlas->reflections[0].data.layers[0].mipmaps.size() != 8;
+	if (update_mode_changed || real_time_mipmaps_different) {
 		// Invalidate reflection atlas, need to regenerate
 		RD::get_singleton()->free(atlas->reflection);
 		atlas->reflection = RID();
@@ -1517,7 +1520,7 @@ bool LightStorage::reflection_probe_instance_begin_render(RID p_instance, RID p_
 
 	if (atlas->reflection.is_null()) {
 		int mipmaps = MIN(RendererSceneRenderRD::get_singleton()->get_sky()->roughness_layers, Image::get_image_required_mipmaps(atlas->size, atlas->size, Image::FORMAT_RGBAH) + 1);
-		mipmaps = LightStorage::get_singleton()->reflection_probe_get_update_mode(rpi->probe) == RS::REFLECTION_PROBE_UPDATE_ALWAYS ? 8 : mipmaps; // always use 8 mipmaps with real time filtering
+		mipmaps = update_always ? 8 : mipmaps; // always use 8 mipmaps with real time filtering
 		{
 			//reflection atlas was unused, create:
 			RD::TextureFormat tf;
@@ -1540,7 +1543,7 @@ bool LightStorage::reflection_probe_instance_begin_render(RID p_instance, RID p_
 		}
 		atlas->reflections.resize(atlas->count);
 		for (int i = 0; i < atlas->count; i++) {
-			atlas->reflections.write[i].data.update_reflection_data(atlas->size, mipmaps, false, atlas->reflection, i * 6, LightStorage::get_singleton()->reflection_probe_get_update_mode(rpi->probe) == RS::REFLECTION_PROBE_UPDATE_ALWAYS, RendererSceneRenderRD::get_singleton()->get_sky()->roughness_layers, RendererSceneRenderRD::get_singleton()->_render_buffers_get_color_format());
+			atlas->reflections.write[i].data.update_reflection_data(atlas->size, mipmaps, false, atlas->reflection, i * 6, update_always, RendererSceneRenderRD::get_singleton()->get_sky()->roughness_layers, RendererSceneRenderRD::get_singleton()->_render_buffers_get_color_format());
 			for (int j = 0; j < 6; j++) {
 				atlas->reflections.write[i].fbs[j] = RendererSceneRenderRD::get_singleton()->reflection_probe_create_framebuffer(atlas->reflections.write[i].data.layers[0].mipmaps[0].views[j], atlas->depth_buffer);
 			}
@@ -1551,6 +1554,7 @@ bool LightStorage::reflection_probe_instance_begin_render(RID p_instance, RID p_
 		atlas->depth_fb = RD::get_singleton()->framebuffer_create(fb);
 
 		atlas->render_buffers->configure_for_reflections(Size2i(atlas->size, atlas->size));
+		atlas->update_always = update_always;
 	}
 
 	if (rpi->atlas_index == -1) {

servers/rendering/renderer_rd/storage_rd/light_storage.h

@@ -246,6 +246,7 @@ class LightStorage : public RendererLightStorage {
 	struct ReflectionAtlas {
 		int count = 0;
 		int size = 0;
+		bool update_always = false;
 
 		RID reflection;
 		RID depth_buffer;