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LibGL+LibSoftGPU: Add support for 8-bit luminance (+ alpha) textures

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Used by Half-Life for single colour textures. The alpha variant is
especially used for UI textures.
This commit is contained in:
Luke Wilde 2022-01-15 10:11:27 +00:00 • committed by Andreas Kling
parent 6e37487477
commit c6a0365c58
3 changed files with 43 additions and 1 deletions
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32
Userland/Libraries/LibSoftGPU/ImageFormat.h
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@ -16,12 +16,17 @@ enum class ImageFormat {
BGR888,
RGBA8888,
BGRA8888,
L8,
L8A8,
};
inline static constexpr size_t element_size(ImageFormat format)
{
switch (format) {
case ImageFormat::L8:
return 1;
case ImageFormat::RGB565:
case ImageFormat::L8A8:
return 2;
case ImageFormat::RGB888:
case ImageFormat::BGR888:
@ -83,6 +88,26 @@ inline static FloatVector4 unpack_color(void const* ptr, ImageFormat format)
1.0f
};
}
case ImageFormat::L8: {
auto luminance = *reinterpret_cast<u8 const*>(ptr);
auto clamped_luminance = luminance * one_over_255;
return {
clamped_luminance,
clamped_luminance,
clamped_luminance,
1.0f,
};
}
case ImageFormat::L8A8: {
auto luminance_and_alpha = reinterpret_cast<u8 const*>(ptr);
auto clamped_luminance = luminance_and_alpha[0] * one_over_255;
return {
clamped_luminance,
clamped_luminance,
clamped_luminance,
luminance_and_alpha[1] * one_over_255,
};
}
default:
VERIFY_NOT_REACHED();
}
@ -115,6 +140,13 @@ inline static void pack_color(FloatVector4 const& color, void* ptr, ImageFormat
case ImageFormat::RGB565:
*reinterpret_cast<u16*>(ptr) = (r & 0x1f) | ((g & 0x3f) << 5) | ((b & 0x1f) << 11);
return;
case ImageFormat::L8:
*reinterpret_cast<u8*>(ptr) = r;
return;
case ImageFormat::L8A8:
reinterpret_cast<u8*>(ptr)[0] = r;
reinterpret_cast<u8*>(ptr)[1] = a;
return;
default:
VERIFY_NOT_REACHED();
}