mirror of https://github.com/bsnes-emu/bsnes.git
109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
#ifdef SUPERFX_CPP
|
|
|
|
void SuperFX::stop() {
|
|
cpu.regs.irq = 1;
|
|
}
|
|
|
|
uint8 SuperFX::color(uint8 source) {
|
|
if(regs.por.highnibble) return (regs.colr & 0xf0) | (source >> 4);
|
|
if(regs.por.freezehigh) return (regs.colr & 0xf0) | (source & 0x0f);
|
|
return source;
|
|
}
|
|
|
|
void SuperFX::plot(uint8 x, uint8 y) {
|
|
uint8 color = regs.colr;
|
|
|
|
if(regs.por.dither && regs.scmr.md != 3) {
|
|
if((x ^ y) & 1) color >>= 4;
|
|
color &= 0x0f;
|
|
}
|
|
|
|
if(!regs.por.transparent) {
|
|
if(regs.scmr.md == 3) {
|
|
if(regs.por.freezehigh) {
|
|
if((color & 0x0f) == 0) return;
|
|
} else {
|
|
if(color == 0) return;
|
|
}
|
|
} else {
|
|
if((color & 0x0f) == 0) return;
|
|
}
|
|
}
|
|
|
|
uint16 offset = (y << 5) + (x >> 3);
|
|
if(offset != pixelcache[0].offset) {
|
|
pixelcache_flush(pixelcache[1]);
|
|
pixelcache[1] = pixelcache[0];
|
|
pixelcache[0].bitpend = 0x00;
|
|
pixelcache[0].offset = offset;
|
|
}
|
|
|
|
x = (x & 7) ^ 7;
|
|
pixelcache[0].data[x] = color;
|
|
pixelcache[0].bitpend |= 1 << x;
|
|
if(pixelcache[0].bitpend == 0xff) {
|
|
pixelcache_flush(pixelcache[1]);
|
|
pixelcache[1] = pixelcache[0];
|
|
pixelcache[0].bitpend = 0x00;
|
|
}
|
|
}
|
|
|
|
uint8 SuperFX::rpix(uint8 x, uint8 y) {
|
|
pixelcache_flush(pixelcache[1]);
|
|
pixelcache_flush(pixelcache[0]);
|
|
|
|
unsigned cn; //character number
|
|
switch(regs.por.obj ? 3 : regs.scmr.ht) {
|
|
case 0: cn = ((x & 0xf8) << 1) + ((y & 0xf8) >> 3); break;
|
|
case 1: cn = ((x & 0xf8) << 1) + ((x & 0xf8) >> 1) + ((y & 0xf8) >> 3); break;
|
|
case 2: cn = ((x & 0xf8) << 1) + ((x & 0xf8) << 0) + ((y & 0xf8) >> 3); break;
|
|
case 3: cn = ((y & 0x80) << 2) + ((x & 0x80) << 1) + ((y & 0x78) << 1) + ((x & 0x78) >> 3); break;
|
|
}
|
|
unsigned bpp = 2 << (regs.scmr.md - (regs.scmr.md >> 1)); // = [regs.scmr.md]{ 2, 4, 4, 8 };
|
|
unsigned addr = 0x700000 + (cn * (bpp << 3)) + (regs.scbr << 10) + ((y & 0x07) * 2);
|
|
uint8 data = 0x00;
|
|
x = (x & 7) ^ 7;
|
|
|
|
for(unsigned n = 0; n < bpp; n++) {
|
|
unsigned byte = ((n >> 1) << 4) + (n & 1); // = [n]{ 0, 1, 16, 17, 32, 33, 48, 49 };
|
|
step(memory_access_speed);
|
|
data |= ((bus_read(addr + byte) >> x) & 1) << n;
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
void SuperFX::pixelcache_flush(pixelcache_t& cache) {
|
|
if(cache.bitpend == 0x00) return;
|
|
|
|
uint8 x = cache.offset << 3;
|
|
uint8 y = cache.offset >> 5;
|
|
|
|
unsigned cn; //character number
|
|
switch(regs.por.obj ? 3 : regs.scmr.ht) {
|
|
case 0: cn = ((x & 0xf8) << 1) + ((y & 0xf8) >> 3); break;
|
|
case 1: cn = ((x & 0xf8) << 1) + ((x & 0xf8) >> 1) + ((y & 0xf8) >> 3); break;
|
|
case 2: cn = ((x & 0xf8) << 1) + ((x & 0xf8) << 0) + ((y & 0xf8) >> 3); break;
|
|
case 3: cn = ((y & 0x80) << 2) + ((x & 0x80) << 1) + ((y & 0x78) << 1) + ((x & 0x78) >> 3); break;
|
|
}
|
|
unsigned bpp = 2 << (regs.scmr.md - (regs.scmr.md >> 1)); // = [regs.scmr.md]{ 2, 4, 4, 8 };
|
|
unsigned addr = 0x700000 + (cn * (bpp << 3)) + (regs.scbr << 10) + ((y & 0x07) * 2);
|
|
|
|
for(unsigned n = 0; n < bpp; n++) {
|
|
unsigned byte = ((n >> 1) << 4) + (n & 1); // = [n]{ 0, 1, 16, 17, 32, 33, 48, 49 };
|
|
uint8 data = 0x00;
|
|
for(unsigned x = 0; x < 8; x++) data |= ((cache.data[x] >> n) & 1) << x;
|
|
if(cache.bitpend != 0xff) {
|
|
step(memory_access_speed);
|
|
data &= cache.bitpend;
|
|
data |= bus_read(addr + byte) & ~cache.bitpend;
|
|
}
|
|
step(memory_access_speed);
|
|
bus_write(addr + byte, data);
|
|
}
|
|
|
|
cache.bitpend = 0x00;
|
|
}
|
|
|
|
#endif
|