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pcsx2: Add IPU dithering to RGB32->RGB16 conversion

This commit is contained in:
Jonathan Li 2019-10-07 12:06:30 +01:00
parent 1ac1bc9a95
commit f9b51e2656
1 changed files with 29 additions and 6 deletions
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35
pcsx2/IPU/IPUdither.cpp
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@ -23,12 +23,35 @@
__ri void ipu_dither(const macroblock_rgb32 &rgb32, macroblock_rgb16 &rgb16, int dte) __ri void ipu_dither(const macroblock_rgb32 &rgb32, macroblock_rgb16 &rgb16, int dte)
{ {
for (int i = 0; i < 16; ++i) { if (dte) {
for (int j = 0; j < 16; ++j) { // I'm guessing values are rounded down when clamping.
rgb16.c[i][j].r = rgb32.c[i][j].r >> 3; const int dither_coefficient[4][4] = {
rgb16.c[i][j].g = rgb32.c[i][j].g >> 3; {-4, 0, -3, 1},
rgb16.c[i][j].b = rgb32.c[i][j].b >> 3; {2, -2, 3, -1},
rgb16.c[i][j].a = rgb32.c[i][j].a == 0x40; {-3, 1, -4, 0},
{3, -1, 2, -2},
};
for (int i = 0; i < 16; ++i) {
for (int j = 0; j < 16; ++j) {
const int dither = dither_coefficient[i & 3][j & 3];
const int r = std::max(0, std::min(rgb32.c[i][j].r + dither, 255));
const int g = std::max(0, std::min(rgb32.c[i][j].g + dither, 255));
const int b = std::max(0, std::min(rgb32.c[i][j].b + dither, 255));
rgb16.c[i][j].r = r >> 3;
rgb16.c[i][j].g = g >> 3;
rgb16.c[i][j].b = b >> 3;
rgb16.c[i][j].a = rgb32.c[i][j].a == 0x40;
}
}
} else {
for (int i = 0; i < 16; ++i) {
for (int j = 0; j < 16; ++j) {
rgb16.c[i][j].r = rgb32.c[i][j].r >> 3;
rgb16.c[i][j].g = rgb32.c[i][j].g >> 3;
rgb16.c[i][j].b = rgb32.c[i][j].b >> 3;
rgb16.c[i][j].a = rgb32.c[i][j].a == 0x40;
}
} }
} }
} }