Merge pull request godotengine#94492 from jsjtxietian/fsr-1

Add warning when use FSR1 on renderer other than forward plus

Author: akien-mga

servers/rendering/renderer_viewport.cpp

@@ -899,6 +899,7 @@ void RendererViewport::viewport_set_use_xr(RID p_viewport, bool p_use_xr) {
 void RendererViewport::viewport_set_scaling_3d_mode(RID p_viewport, RS::ViewportScaling3DMode p_mode) {
 	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
 	ERR_FAIL_NULL(viewport);
+	ERR_FAIL_COND_EDMSG(p_mode == RS::VIEWPORT_SCALING_3D_MODE_FSR && OS::get_singleton()->get_current_rendering_method() != "forward_plus", "FSR1 is only available when using the Forward+ renderer.");
 	ERR_FAIL_COND_EDMSG(p_mode == RS::VIEWPORT_SCALING_3D_MODE_FSR2 && OS::get_singleton()->get_current_rendering_method() != "forward_plus", "FSR2 is only available when using the Forward+ renderer.");
 
 	if (viewport->scaling_3d_mode == p_mode) {