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Significantly optimize 16-bit color mixing

This commit is contained in:
Jeffrey Pfau 2013-11-14 00:19:18 -08:00
parent 620adbd577
commit a2a306bb03
1 changed files with 24 additions and 28 deletions
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52
src/gba/renderers/video-software.c
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@ -1535,40 +1535,36 @@ static unsigned _mix(int weightA, unsigned colorA, int weightB, unsigned colorB)
unsigned c = 0;
unsigned a, b;
#ifdef COLOR_16_BIT
a = colorA & 0x1F;
b = colorB & 0x1F;
c |= ((a * weightA + b * weightB) / 16) & 0x3F;
if (c & 0x0020) {
c = 0x001F;
}
#ifdef COLOR_5_6_5
a = colorA & 0x7C0;
b = colorB & 0x7C0;
c |= ((a * weightA + b * weightB) / 16) & 0xFC0;
if (c & 0x0800) {
c = (c & 0x001F) | 0x07C0;
a = colorA & ~0x7C0;
b = colorB & ~0x7C0;
a |= (colorA & 0x7C0) << 16;
b |= (colorB & 0x7C0) << 16;
c |= ((a * weightA + b * weightB) / 16);
if (c & 0x0020) {
c = (c & ~0x0020) | 0x001F;
}
a = colorA & 0xF800;
b = colorB & 0xF800;
c |= ((a * weightA + b * weightB) / 16) & 0x1F800;
if (c & 0x10000) {
c = (c &0x07FF) | 0xF800;
c = (c & ~0x10000) | 0xF800;
}
if (c & 0x08000000) {
c = (c & 0x08000000) | 0x07C00000;
}
c = (c & 0xFFFF) | (c >> 16);
#else
a = colorA & 0x3E0;
b = colorB & 0x3E0;
c |= ((a * weightA + b * weightB) / 16) & 0x7E0;
if (c & 0x0400) {
c = (c & 0x001F) | 0x03E0;
a = colorA & ~0x3E0;
b = colorB & ~0x3E0;
a |= (colorA & 0x3E0) << 16;
b |= (colorB & 0x3E0) << 16;
c |= ((a * weightA + b * weightB) / 16);
if (c & 0x0020) {
c = (c & ~0x0020) | 0x001F;
}
a = colorA & 0x7C00;
b = colorB & 0x7C00;
c |= ((a * weightA + b * weightB) / 16) & 0xFC00;
if (c & 0x8000) {
c = (c &0x03FF) | 0x7C00;
if (c & 0x10000) {
c = (c & ~0x10000) | 0xF800;
}
if (c & 0x04000000) {
c = (c & 0x04000000) | 0x03E00000;
}
#endif
#else