Metal: implement support for compressed textures #119835
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Clément Foucault
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Reference: blender/blender#119835
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Delete Branch "aras_p/blender:mtl-compressed-textures"
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Noticed lack of it via #119793. Now DDS images using BC1/BC2/BC3 (aka DXT1/DXT3/DXT5) formats can keep on being GPU compressed on Metal too, just like e.g. on OpenGL.
Repro attached to #119841 can be used for testing.
I will do Vulkan side in a separate PR, since that one does not handle compressed textures properly either, it seems.
@blender-bot build
@ -757,1 +761,4 @@size_t bytes_per_image = bytes_per_row;if (is_compressed) {size_t block_size = to_block_size(format_);size_t blocks_x = (extent[0] + 3) / 4;We have
divide_ceil_u()for this.I believe this makes #119793 obsolete, once this is merged.
gpu::MTLTexture::readseems suspicious, since it asserts for compressed textures. Maybe this is related to why it wasn't implemented. Do you happened to know anything about that?@OmarEmaraDev I don't, but OpenGL implementation has the same assert:
BLI_assert(!(format_flag_ & GPU_FORMAT_COMPRESSED));. So I guess whatever read does (I don't even know), is not supposed to be called on compressed textures. Vulkan texture implementation does not have the assert, but it seems like it does not handle compressed textures either (hmm maybe I should fix that too?)Reading Compressed format is never used. So no need to implement this.