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eae9fa7030
Hosts without native ETC2 now report ETC2/EAC support. Uploads into emulated images are decoded to RGBA8/R16 staging buffers at submit. MOCKTAIL_DISABLE_ETC2_EMULATION=1 turns it off.
40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
#ifndef MOCKTAIL_GRAPHICS_ETC2_DECODER_H_
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#define MOCKTAIL_GRAPHICS_ETC2_DECODER_H_
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#include <cstddef>
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#include <cstdint>
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namespace mocktail::graphics {
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// ETC2 and EAC block encodings from the OpenGL ES 3.0 / Vulkan core formats.
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// sRGB variants share the unorm encoding; the colour space belongs to the
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// destination format.
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enum class EtcFormat {
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kEtc2Rgb8,
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kEtc2Rgb8A1,
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kEtc2Rgba8,
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kEacR11,
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kEacR11Signed,
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kEacRg11,
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kEacRg11Signed,
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};
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// Compressed bytes per 4x4 block.
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std::size_t EtcBlockBytes(EtcFormat format);
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// Decoded bytes per texel: 4 (RGBA8) for ETC2 formats, 2 per channel
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// (16-bit, little-endian) for EAC formats.
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std::size_t EtcDecodedTexelBytes(EtcFormat format);
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// Decodes a width x height image stored as ceil(width/4) x ceil(height/4)
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// blocks into row-major texels. Returns false, writing nothing, when a buffer
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// is smaller than the image requires.
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bool DecodeEtcImage(EtcFormat format, const std::uint8_t* source,
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std::size_t source_bytes, std::uint32_t width,
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std::uint32_t height, std::uint8_t* destination,
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std::size_t destination_bytes);
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} // namespace mocktail::graphics
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#endif // MOCKTAIL_GRAPHICS_ETC2_DECODER_H_
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