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[Fix] (MG_Util/Converters): resolve the GL_COMPRESSED_* internal formats to the uncompressed storage that backs them instead of rejecting them as unknown - GL prescribes this base-format fallback for the six generic formats, and RGTC stores uncompressed because ES exposes no compressor

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swung0x48
2026-07-20 21:05:57 -04:00
parent e724e88eec
commit e526f8e8ac
2 changed files with 72 additions and 0 deletions
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MobileGL/MG_Util/Converters/GLToMG/TextureEnumConverter.cpp
+31
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@@ -255,6 +255,37 @@ namespace MobileGL {
return TextureInternalFormat::DepthComponent;
case GL_DEPTH_STENCIL:
return TextureInternalFormat::DepthStencil;
// Compressed internal formats resolve to the uncompressed storage that backs them.
//
// For the six generic formats this is exactly what GL prescribes: the implementation
// picks a specific compressed format, and when none is available it falls back to the
// corresponding base format. Nothing downstream ever sees a compressed enum, so the
// metrics, pixel-store and backend tables keep their "one format, N bytes per texel"
// invariant instead of each needing a compressed-aware arm.
//
// The four RGTC formats are a deliberate deviation: they are specific formats that GL
// 3.3 requires, but ES exposes no RGTC compressor to hand the data to. Storing the
// texels uncompressed keeps them renderable at the cost of the memory saving, which is
// strictly better than the INVALID_ENUM the application used to get. Note the signed
// variants must land on SNORM storage - CTS uploads them as GL_BYTE.
case GL_COMPRESSED_RED:
case GL_COMPRESSED_RED_RGTC1:
return TextureInternalFormat::R8;
case GL_COMPRESSED_SIGNED_RED_RGTC1:
return TextureInternalFormat::R8Snorm;
case GL_COMPRESSED_RG:
case GL_COMPRESSED_RG_RGTC2:
return TextureInternalFormat::RG8;
case GL_COMPRESSED_SIGNED_RG_RGTC2:
return TextureInternalFormat::RG8Snorm;
case GL_COMPRESSED_RGB:
return TextureInternalFormat::RGB8;
case GL_COMPRESSED_RGBA:
return TextureInternalFormat::RGBA8;
case GL_COMPRESSED_SRGB:
return TextureInternalFormat::SRGB8;
case GL_COMPRESSED_SRGB_ALPHA:
return TextureInternalFormat::SRGB8Alpha8;
case GL_ALPHA:
case GL_RED:
return TextureInternalFormat::Red;