NTSC Timing Helper Functions
()
| 384 | // NTSC Timing Helper Functions |
| 385 | |
| 386 | func (ppu *PPU) incrementX() { |
| 387 | // increment hori(v) |
| 388 | // if coarse X == 31 |
| 389 | if ppu.v&0x001F == 31 { |
| 390 | // coarse X = 0 |
| 391 | ppu.v &= 0xFFE0 |
| 392 | // switch horizontal nametable |
| 393 | ppu.v ^= 0x0400 |
| 394 | } else { |
| 395 | // increment coarse X |
| 396 | ppu.v++ |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | func (ppu *PPU) incrementY() { |
| 401 | // increment vert(v) |