mirror of https://github.com/bsnes-emu/bsnes.git
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
auto PPU::OAM::read(uint10 addr) -> uint8 {
|
|
if(!addr.bit(9)) {
|
|
uint n = addr >> 2; //object#
|
|
addr &= 3;
|
|
if(addr == 0) return object[n].x.bits(0,7);
|
|
if(addr == 1) return object[n].y;
|
|
if(addr == 2) return object[n].character;
|
|
return (
|
|
object[n].nameselect << 0
|
|
| object[n].palette << 1
|
|
| object[n].priority << 4
|
|
| object[n].hflip << 6
|
|
| object[n].vflip << 7
|
|
);
|
|
} else {
|
|
uint n = (addr & 0x1f) << 2; //object#
|
|
return (
|
|
object[n + 0].x.bit(8) << 0
|
|
| object[n + 0].size << 1
|
|
| object[n + 1].x.bit(8) << 2
|
|
| object[n + 1].size << 3
|
|
| object[n + 2].x.bit(8) << 4
|
|
| object[n + 2].size << 5
|
|
| object[n + 3].x.bit(8) << 6
|
|
| object[n + 3].size << 7
|
|
);
|
|
}
|
|
}
|
|
|
|
auto PPU::OAM::write(uint10 addr, uint8 data) -> void {
|
|
if(!addr.bit(9)) {
|
|
uint n = addr >> 2; //object#
|
|
addr &= 3;
|
|
if(addr == 0) { object[n].x.bits(0,7) = data; return; }
|
|
if(addr == 1) { object[n].y = data; return; }
|
|
if(addr == 2) { object[n].character = data; return; }
|
|
object[n].nameselect = data.bit (0);
|
|
object[n].palette = data.bits(1,3);
|
|
object[n].priority = data.bits(4,5);
|
|
object[n].hflip = data.bit (6);
|
|
object[n].vflip = data.bit (7);
|
|
} else {
|
|
uint n = (addr & 0x1f) << 2; //object#
|
|
object[n + 0].x.bit(8) = data.bit(0);
|
|
object[n + 0].size = data.bit(1);
|
|
object[n + 1].x.bit(8) = data.bit(2);
|
|
object[n + 1].size = data.bit(3);
|
|
object[n + 2].x.bit(8) = data.bit(4);
|
|
object[n + 2].size = data.bit(5);
|
|
object[n + 3].x.bit(8) = data.bit(6);
|
|
object[n + 3].size = data.bit(7);
|
|
}
|
|
}
|
|
|
|
auto PPU::OAM::Object::width() const -> uint {
|
|
if(size == 0) {
|
|
static const uint width[] = { 8, 8, 8, 16, 16, 32, 16, 16};
|
|
return width[ppu.obj.io.baseSize];
|
|
} else {
|
|
static const uint width[] = {16, 32, 64, 32, 64, 64, 32, 32};
|
|
return width[ppu.obj.io.baseSize];
|
|
}
|
|
}
|
|
|
|
auto PPU::OAM::Object::height() const -> uint {
|
|
if(size == 0) {
|
|
if(ppu.obj.io.interlace && ppu.obj.io.baseSize >= 6) return 16; //hardware quirk
|
|
static const uint height[] = { 8, 8, 8, 16, 16, 32, 32, 32};
|
|
return height[ppu.obj.io.baseSize];
|
|
} else {
|
|
static const uint height[] = {16, 32, 64, 32, 64, 64, 64, 32};
|
|
return height[ppu.obj.io.baseSize];
|
|
}
|
|
}
|