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, 4 deletions

diff --git a/modules/lightmapper_rd/lm_common_inc.glsl b/modules/lightmapper_rd/lm_common_inc.glsl
index f8a0cd16de..1581639036 100644
--- a/modules/lightmapper_rd/lm_common_inc.glsl
+++ b/modules/lightmapper_rd/lm_common_inc.glsl
@@ -84,9 +84,8 @@ layout(set = 0, binding = 7, std430) restrict readonly buffer Probes {
 probe_positions;
 
 layout(set = 0, binding = 8) uniform utexture3D grid;
-layout(set = 0, binding = 9) uniform texture3D grid_sdf;
 
-layout(set = 0, binding = 10) uniform texture2DArray albedo_tex;
-layout(set = 0, binding = 11) uniform texture2DArray emission_tex;
+layout(set = 0, binding = 9) uniform texture2DArray albedo_tex;
+layout(set = 0, binding = 10) uniform texture2DArray emission_tex;
 
-layout(set = 0, binding = 12) uniform sampler linear_sampler;
+layout(set = 0, binding = 11) uniform sampler linear_sampler;