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Recorrect green bit math.

This commit is contained in:
Brandon Wright 2019-04-01 11:43:56 -05:00
parent ff964ded04
commit e87b742787
1 changed files with 13 additions and 5 deletions
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18
gfx.h
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@ -135,7 +135,7 @@ extern struct SGFX GFX;
inline uint16 COLOR_ADD_BRIGHTNESS(uint16 C1, uint16 C2)
{
return ((brightness_cap[ (C1 >> RED_SHIFT_BITS) + (C2 >> RED_SHIFT_BITS) ] << RED_SHIFT_BITS) |
return ((brightness_cap[ (C1 >> RED_SHIFT_BITS) + (C2 >> RED_SHIFT_BITS) ] << RED_SHIFT_BITS) |
(brightness_cap[((C1 >> GREEN_SHIFT_BITS) & 0x1f) + ((C2 >> GREEN_SHIFT_BITS) & 0x1f)] << GREEN_SHIFT_BITS) |
// Proper 15->16bit color conversion moves the high bit of green into the low bit.
#if GREEN_SHIFT_BITS == 6
@ -154,8 +154,12 @@ 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 = (rbcarry >> 5) * 0x1f + ((g & (0x20 << GREEN_SHIFT_BITS)) >> GREEN_SHIFT_BITS) * MAX_GREEN;
return (rb & (RED_MASK | BLUE_MASK)) | (g & GREEN_MASK) | rgbsaturate;
int rgbsaturate = (((g & (0x20 << GREEN_SHIFT_BITS)) | rbcarry) >> 5) * 0x1f;
uint16 retval = (rb & (RED_MASK | BLUE_MASK)) | (g & GREEN_MASK) | rgbsaturate;
#if GREEN_SHIFT_BITS == 6
retval |= (retval & 0x0400) >> 5;
#endif
return retval;
}
@ -170,8 +174,12 @@ inline uint16 COLOR_SUB (uint16 C1, uint16 C2)
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;
int rgbsaturate = (((g & (0x20 << GREEN_SHIFT_BITS)) | rbcarry) >> 5) * 0x1f;
uint16 retval = ((rb & (THIRD_COLOR_MASK | FIRST_COLOR_MASK)) | (g & SECOND_COLOR_MASK)) & rgbsaturate;
#if GREEN_SHIFT_BITS == 6
retval |= (retval & 0x0400) >> 5;
#endif
return retval;
}
void S9xStartScreenRefresh (void);