Assorted fixes to UV unwrapping and GPU lightmapper

Various fixes to UV2 unwrapping and the GPU lightmapper. Listed here for
context in case of git blame/bisect:

* Fix UV2 unwrapping on import, also cleaned up the unwrap cache code.
* Fix saving of RGBA images in EXR format.
* Fixes to the GPU lightmapper:
	- Added padding between atlas elements, avoids bleeding.
	- Remove old SDF generation code.
	- Fix baked attenuation for Omni/Spot lights.
	- Fix baking of material properties onto UV2 (wireframe was
	  wrongly used before).
	- Disable statically baked lights for objects that have a
	  lightmap texture to avoid applying the same light twice.
	- Fix lightmap pairing in RendererSceneCull.
	- Fix UV2 array generated from `RenderingServer::mesh_surface_get_arrays()`.
	- Port autoexposure fix for OIDN from 3.x.
	- Save debug textures as EXR when using floating point format.

1 files changed, 3 insertions, 2 deletions

diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.h b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
index b289eda58f..7600d6823e 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.h
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
@@ -497,7 +497,7 @@ private:
 			float soft_shadow_scale;
 			uint32_t mask;
 			float shadow_volumetric_fog_fade;
-			uint32_t pad;
+			uint32_t bake_mode;
 			float projector_rect[4];
 		};
 
@@ -514,7 +514,8 @@ private:
 			uint32_t shadow_enabled;
 			float fade_from;
 			float fade_to;
-			uint32_t pad[3];
+			uint32_t pad[2];
+			uint32_t bake_mode;
 			float shadow_volumetric_fog_fade;
 			float shadow_bias[4];
 			float shadow_normal_bias[4];