Merge pull request godotengine#95659 from clayjohn/RD-sky-affect

Ensure `fog_sky_affect` is used even when using a background color

Author: akien-mga

servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.cpp

@@ -1827,7 +1827,7 @@ void RenderForwardClustered::_render_scene(RenderDataRD *p_render_data, const Co
 				clear_color.r *= bg_energy_multiplier;
 				clear_color.g *= bg_energy_multiplier;
 				clear_color.b *= bg_energy_multiplier;
-				if (!p_render_data->transparent_bg && rb->has_custom_data(RB_SCOPE_FOG) && environment_get_fog_enabled(p_render_data->environment)) {
+				if (!p_render_data->transparent_bg && (rb->has_custom_data(RB_SCOPE_FOG) || environment_get_fog_enabled(p_render_data->environment))) {
 					draw_sky_fog_only = true;
 					RendererRD::MaterialStorage::get_singleton()->material_set_param(sky.sky_scene_state.fog_material, "clear_color", Variant(clear_color.srgb_to_linear()));
 				}
@@ -1837,7 +1837,7 @@ void RenderForwardClustered::_render_scene(RenderDataRD *p_render_data, const Co
 				clear_color.r *= bg_energy_multiplier;
 				clear_color.g *= bg_energy_multiplier;
 				clear_color.b *= bg_energy_multiplier;
-				if (!p_render_data->transparent_bg && rb->has_custom_data(RB_SCOPE_FOG) && environment_get_fog_enabled(p_render_data->environment)) {
+				if (!p_render_data->transparent_bg && (rb->has_custom_data(RB_SCOPE_FOG) || environment_get_fog_enabled(p_render_data->environment))) {
 					draw_sky_fog_only = true;
 					RendererRD::MaterialStorage::get_singleton()->material_set_param(sky.sky_scene_state.fog_material, "clear_color", Variant(clear_color.srgb_to_linear()));
 				}