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Snes9x - Adjust new math to do 15->16 bit correctly. (#829)

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Commits from Snes9x:
- Change variable names to make sense.
- Adjust new math to do 15->16 bit correctly.
This commit is contained in:
bladeoner 2019-03-28 14:56:56 +01:00 committed by dborth
parent 56fb0046ba
commit ff8f40e53b
1 changed files with 9 additions and 14 deletions
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23
source/snes9x/gfx.h
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@ -154,8 +154,8 @@ inline uint16 COLOR_ADD(uint16 C1, uint16 C2)
rb += C2 & (RED_MASK | BLUE_MASK);
int rbcarry = rb & ((0x20 << RED_SHIFT_BITS) | (0x20 << 0));
int g = (C1 & (GREEN_MASK)) + (C2 & (GREEN_MASK));
int rgbsaturate = (((g & (0x20 << GREEN_SHIFT_BITS)) | rbcarry) >> 5) * 0x1f;
return (uint16)((rb & (RED_MASK | BLUE_MASK)) | (g & GREEN_MASK) | rgbsaturate);
int rgbsaturate = (rbcarry >> 5) * 0x1f + ((g & (0x20 << GREEN_SHIFT_BITS)) >> GREEN_SHIFT_BITS) * MAX_GREEN;
return (rb & (RED_MASK | BLUE_MASK)) | (g & GREEN_MASK) | rgbsaturate;
}
@ -165,18 +165,13 @@ inline uint16 COLOR_ADD(uint16 C1, uint16 C2)
inline uint16 COLOR_SUB (uint16 C1, uint16 C2)
{
int a = (C1 & (THIRD_COLOR_MASK | FIRST_COLOR_MASK)) | ((0x20 << 0) | (0x20 << RED_SHIFT_BITS));
int b = C2 & (THIRD_COLOR_MASK | FIRST_COLOR_MASK);
int c = a - b;
int d = c & ((0x20 << RED_SHIFT_BITS) | (0x20 << 0));
int e = (C1 & (SECOND_COLOR_MASK)) | (0x20 << GREEN_SHIFT_BITS);
int f = C2 & (SECOND_COLOR_MASK);
int g = e - f;
int h = (g & (0x20 << GREEN_SHIFT_BITS)) | d;
int i = h >> 5;
int j = i * 0x1F;
int k = ((c & (THIRD_COLOR_MASK | FIRST_COLOR_MASK)) | (g & SECOND_COLOR_MASK)) & j;
return (uint16)k;
int rb1 = (C1 & (THIRD_COLOR_MASK | FIRST_COLOR_MASK)) | ((0x20 << 0) | (0x20 << RED_SHIFT_BITS));
int rb2 = C2 & (THIRD_COLOR_MASK | FIRST_COLOR_MASK);
int rb = rb1 - rb2;
int rbcarry = rb & ((0x20 << RED_SHIFT_BITS) | (0x20 << 0));
int g = ((C1 & (SECOND_COLOR_MASK)) | (0x20 << GREEN_SHIFT_BITS)) - (C2 & (SECOND_COLOR_MASK));
int rgbsaturate = (rbcarry >> 5) * 0x1f + ((g & (0x20 << GREEN_SHIFT_BITS)) >> GREEN_SHIFT_BITS) * MAX_GREEN;
return ((rb & (THIRD_COLOR_MASK | FIRST_COLOR_MASK)) | (g & SECOND_COLOR_MASK)) & rgbsaturate;
}
void S9xStartScreenRefresh (void);