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snes9x
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Use a lookup table. A little faster.

This commit is contained in:
Brandon Wright 2019-03-06 20:17:07 -06:00
parent db8227fa42
commit 02aa2d0c6a
3 changed files with 17 additions and 16 deletions
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17
gfx.h
View File

@ -125,6 +125,7 @@ struct SLineMatrixData
extern uint16 BlackColourMap[256];
extern uint16 DirectColourMaps[8][256];
extern uint8 mul_brightness[16][32];
extern uint8 brightness_cap[64];
extern struct SBG BG;
extern struct SGFX GFX;
@ -132,8 +133,6 @@ extern struct SGFX GFX;
#define V_FLIP 0x8000
#define BLANK_TILE 2
#include "ppu.h"
#define COLOR_ADD1_2(C1, C2) \
((((((C1) & RGB_REMOVE_LOW_BITS_MASK) + \
((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1) + \
@ -148,19 +147,11 @@ extern struct SGFX GFX;
inline uint16 COLOR_ADD(uint16 C1, uint16 C2)
{
int r1, g1, b1, r2, g2, b2;
int cap = mul_brightness[PPU.Brightness][31];
DECOMPOSE_PIXEL(C1, r1, g1, b1);
DECOMPOSE_PIXEL(C2, r2, g2, b2);
r1 += r2;
if (r1 > cap)
r1 = cap;
g1 += g2;
if (g1 > cap)
g1 = cap;
b1 += b2;
if (b1 > cap)
b1 = cap;
return BUILD_PIXEL(r1, g1, b1);
return BUILD_PIXEL(brightness_cap[r1 + r2],
brightness_cap[g1 + g2],
brightness_cap[b1 + b2]);
}
#define COLOR_SUB1_2(C1, C2) \

2
globals.cpp
View File

@ -144,6 +144,8 @@ uint8 mul_brightness[16][32] =
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f }
};
uint8 brightness_cap[64];
uint8 S9xOpLengthsM0X0[256] =
{
// 0 1 2 3 4 5 6 7 8 9 A B C D E F

8
ppu.cpp
View File

@ -189,6 +189,14 @@ void S9xFixColourBrightness (void)
{
IPPU.XB = mul_brightness[PPU.Brightness];
for (int i = 0; i < 64; i++)
{
if (i > IPPU.XB[0x1f])
brightness_cap[i] = IPPU.XB[0x1f];
else
brightness_cap[i] = i;
}
for (int i = 0; i < 256; i++)
{
IPPU.Red[i] = IPPU.XB[(PPU.CGDATA[i]) & 0x1f];