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LibSoftGPU: Return a const&
texel in Image
to prevent copying
On every texel access, some floating point instructions involved in copying 4 floats popped up. Let `Image::texel() const` return a `FloatVector4 const&` to prevent these operations. This results in a ~7% FPS increase in GLQuake on my machine.
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3 changed files with 10 additions and 10 deletions
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@ -129,7 +129,7 @@ void Image::copy_texels(GPU::Image const& source, u32 source_level, Vector3<u32>
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for (u32 z = 0; z < size.z(); ++z) {
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for (u32 y = 0; y < size.y(); ++y) {
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for (u32 x = 0; x < size.x(); ++x) {
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auto color = src_image.texel(source_level, source_offset.x() + x, source_offset.y() + y, source_offset.z() + z);
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auto const& color = src_image.texel(source_level, source_offset.x() + x, source_offset.y() + y, source_offset.z() + z);
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set_texel(destination_level, destination_offset.x() + x, destination_offset.y() + y, destination_offset.z() + z, color);
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}
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}
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