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LibGL+LibGPU+LibSoftGPU: Implement texture pixel format support

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In OpenGL this is called the (base) internal format which is an
expectation expressed by the client for the minimum supported texel
storage format in the GPU for textures.

Since we store everything as RGBA in a `FloatVector4`, the only thing
we do in this patch is remember the expected internal format, and when
we write new texels we fixate the value for the alpha channel to 1 for
two formats that require it.

`PixelConverter` has learned how to transform pixels during transfer to
support this.
This commit is contained in:
Jelle Raaijmakers 2022-08-26 15:59:51 +02:00 • committed by Andreas Kling
parent 6c80d12111
commit 84c4b66721
13 changed files with 141 additions and 32 deletions
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67
Userland/Libraries/LibGL/Image.cpp
View file

@ -220,4 +220,71 @@ GPU::PixelType get_format_specification(GLenum format, GLenum type)
VERIFY_NOT_REACHED();
}
GPU::PixelFormat pixel_format_for_internal_format(GLenum internal_format)
{
// FIXME: add support for all the SRGB formats
// Numbers 1-4 are supported deprecated values
switch (internal_format) {
case 1:
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
case GL_COMPRESSED_ALPHA:
return GPU::PixelFormat::Alpha;
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32:
return GPU::PixelFormat::DepthComponent;
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
case GL_COMPRESSED_INTENSITY:
return GPU::PixelFormat::Intensity;
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
case GL_COMPRESSED_LUMINANCE:
return GPU::PixelFormat::Luminance;
case 2:
case GL_LUMINANCE_ALPHA:
case GL_LUMINANCE4_ALPHA4:
case GL_LUMINANCE6_ALPHA2:
case GL_LUMINANCE8_ALPHA8:
case GL_LUMINANCE12_ALPHA4:
case GL_LUMINANCE12_ALPHA12:
case GL_LUMINANCE16_ALPHA16:
return GPU::PixelFormat::LuminanceAlpha;
case 3:
case GL_RGB:
case GL_R3_G3_B2:
case GL_RGB4:
case GL_RGB5:
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
case GL_COMPRESSED_RGB:
return GPU::PixelFormat::RGB;
case 4:
case GL_RGBA:
case GL_RGBA2:
case GL_RGBA4:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16:
case GL_COMPRESSED_RGBA:
return GPU::PixelFormat::RGBA;
}
VERIFY_NOT_REACHED();
}
}