Changes to GLES2 renderer to not use cube shadows if not available, fixes #25132

drivers/gles2/rasterizer_scene_gles2.cpp

@@ -2877,7 +2877,7 @@ void RasterizerSceneGLES2::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 
 		if (light->type == VS::LIGHT_OMNI) {
 			// cubemap only
-			if (light->omni_shadow_mode == VS::LIGHT_OMNI_SHADOW_CUBE) {
+			if (light->omni_shadow_mode == VS::LIGHT_OMNI_SHADOW_CUBE && storage->config.support_write_depth) {
 				int cubemap_index = shadow_cubemaps.size() - 1;
 
 				// find an appropriate cubemap to render to
@@ -2973,7 +2973,7 @@ void RasterizerSceneGLES2::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 	state.scene_shader.set_conditional(SceneShaderGLES2::RENDER_DEPTH_DUAL_PARABOLOID, false);
 
 	// convert cubemap to dual paraboloid if needed
-	if (light->type == VS::LIGHT_OMNI && light->omni_shadow_mode == VS::LIGHT_OMNI_SHADOW_CUBE && p_pass == 5) {
+	if (light->type == VS::LIGHT_OMNI && (light->omni_shadow_mode == VS::LIGHT_OMNI_SHADOW_CUBE && storage->config.support_write_depth) && p_pass == 5) {
 		ShadowAtlas *shadow_atlas = shadow_atlas_owner.getornull(p_shadow_atlas);
 
 		glBindFramebuffer(GL_FRAMEBUFFER, shadow_atlas->fbo);

drivers/gles2/rasterizer_scene_gles2.h

@@ -473,6 +473,7 @@ public:
 	virtual void light_instance_set_transform(RID p_light_instance, const Transform &p_transform);
 	virtual void light_instance_set_shadow_transform(RID p_light_instance, const CameraMatrix &p_projection, const Transform &p_transform, float p_far, float p_split, int p_pass, float p_bias_scale = 1.0);
 	virtual void light_instance_mark_visible(RID p_light_instance);
+	virtual bool light_instances_can_render_shadow_cube() const { return storage->config.support_write_depth; }
 
 	LightInstance **render_light_instances;
 	int render_directional_lights;

drivers/gles2/rasterizer_storage_gles2.cpp

@@ -4673,6 +4673,13 @@ void RasterizerStorageGLES2::initialize() {
 	config.support_32_bits_indices = config.extensions.has("GL_OES_element_index_uint");
 #endif
 
+#ifdef GLES_OVER_GL
+	config.support_write_depth = true;
+#else
+	config.support_write_depth = config.extensions.has("GL_EXT_frag_depth");
+#endif
+
+
 	frame.count = 0;
 	frame.delta = 0;
 	frame.current_rt = NULL;

drivers/gles2/rasterizer_storage_gles2.h

@@ -80,6 +80,7 @@ public:
 		bool use_rgba_2d_shadows;
 
 		bool support_32_bits_indices;
+		bool support_write_depth;
 	} config;
 
 	struct Resources {

drivers/gles3/rasterizer_scene_gles3.cpp

@@ -1832,6 +1832,7 @@ void RasterizerSceneGLES3::_render_geometry(RenderList::Element *e) {
 					storage->info.render.vertices_count += s->index_array_len * amount;
 				} else
 #endif
+
 						if (s->index_array_len > 0) {
 
 					glDrawElementsInstanced(gl_primitive[s->primitive], s->index_array_len, (s->array_len >= (1 << 16)) ? GL_UNSIGNED_INT : GL_UNSIGNED_SHORT, 0, amount);

servers/visual/rasterizer.h

@@ -141,6 +141,7 @@ public:
 	virtual void light_instance_set_transform(RID p_light_instance, const Transform &p_transform) = 0;
 	virtual void light_instance_set_shadow_transform(RID p_light_instance, const CameraMatrix &p_projection, const Transform &p_transform, float p_far, float p_split, int p_pass, float p_bias_scale = 1.0) = 0;
 	virtual void light_instance_mark_visible(RID p_light_instance) = 0;
+	virtual bool light_instances_can_render_shadow_cube() const { return true; }
 
 	virtual RID reflection_atlas_create() = 0;
 	virtual void reflection_atlas_set_size(RID p_ref_atlas, int p_size) = 0;

servers/visual/visual_server_scene.cpp

@@ -1535,8 +1535,7 @@ bool VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 
 			VS::LightOmniShadowMode shadow_mode = VSG::storage->light_omni_get_shadow_mode(p_instance->base);
 
-			switch (shadow_mode) {
+			if (shadow_mode == VS::LIGHT_OMNI_SHADOW_DUAL_PARABOLOID || !VSG::scene_render->light_instances_can_render_shadow_cube()) {
-				case VS::LIGHT_OMNI_SHADOW_DUAL_PARABOLOID: {
 
 				for (int i = 0; i < 2; i++) {
 
@@ -1576,8 +1575,7 @@ bool VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 					VSG::scene_render->light_instance_set_shadow_transform(light->instance, CameraMatrix(), light_transform, radius, 0, i);
 					VSG::scene_render->render_shadow(light->instance, p_shadow_atlas, i, (RasterizerScene::InstanceBase **)instance_shadow_cull_result, cull_count);
 				}
-				} break;
+			} else { //shadow cube
-				case VS::LIGHT_OMNI_SHADOW_CUBE: {
 
 				float radius = VSG::storage->light_get_param(p_instance->base, VS::LIGHT_PARAM_RANGE);
 				CameraMatrix cm;
@@ -1633,8 +1631,6 @@ bool VisualServerScene::_light_instance_update_shadow(Instance *p_instance, cons
 
 				//restore the regular DP matrix
 				VSG::scene_render->light_instance_set_shadow_transform(light->instance, CameraMatrix(), light_transform, radius, 0, 0);
-
-				} break;
 			}
 
 		} break;