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Optimize frame buffer copy to RDRAM:

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read from pixel buffer one time per pixel.
Old code does 4 reads from the pixel buffer per pixel.

The optimization makes color buffer read circa 4 times faster.

Thanks Lars Bishop for finding the sources of the problem and for suggested solution.
This commit is contained in:
Sergey Lipskiy 2015-06-16 19:43:15 +06:00
parent 7ee974f213
commit 68941f6cbe
1 changed files with 8 additions and 4 deletions
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12
src/FrameBuffer.cpp
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@ -34,8 +34,11 @@ public:
private:
void _copyWhite(FrameBuffer * _pBuffer);
struct RGBA {
u8 r, g, b, a;
union RGBA {
struct {
u8 r, g, b, a;
};
u32 raw;
};
GLuint m_FBO;
@ -983,11 +986,12 @@ void FrameBufferToRDRAM::CopyToRDRAM(u32 _address)
}
} else {
u16 *ptr_dst = (u16*)(RDRAM + _address);
RGBA * ptr_src = (RGBA*)pixelData;
u32 * ptr_src = (u32*)pixelData;
RGBA c;
for (u32 y = 0; y < height; ++y) {
for (u32 x = 0; x < VI.width; ++x) {
const RGBA & c = ptr_src[x + (height - y - 1)*VI.width];
c.raw = ptr_src[x + (height - y - 1)*VI.width];
ptr_dst[(x + y*VI.width)^1] = ((c.r>>3)<<11) | ((c.g>>3)<<6) | ((c.b>>3)<<1) | (c.a == 0 ? 0 : 1);
}
}