func (n *NES) LoadRom(r rom.ROM) {
mirror := r.Pages() == 1
for i, v := range r.ProgramRom() {
*n.Cartridge[i] = *v
if mirror {
*n.Cartridge[i+0x4000] = *v
}
}
}
func NewPPU(n *nes.NES, sync chan int, rom rom.ROM, renderer Renderer) *PPU {
tm := make([]byte, 0x4000)
m := make([]*byte, 0x4000)
for i := range m {
m[i] = &tm[i]
}
chrRom := rom.CharRom()
for i := range chrRom {
m[i] = chrRom[i]
}
// Mirror some Memory
for i := 0x2000; i < 0x2F00; i++ {
m[i+0x1000] = m[i]
}
for i := 0x3F00; i < 0x3F20; i++ {
m[i+0x0020] = m[i]
}
toam := make([]byte, 0x100)
oam := make([]*byte, 0x100)
for i := range oam {
oam[i] = &toam[i]
}
ppu := &PPU{
nes: n,
sync: sync,
Memory: m,
OAM: oam,
renderer: renderer,
rom: rom,
Registers: &Registers{},
}
n.MemoryMap = nes.MemoryMap{
0x2000: &MappedRegister{func(debug bool) byte { return ppu.PPUCTRL }, func(val byte) { ppu.PPUCTRL = val }},
0x2001: &MappedRegister{func(debug bool) byte { return ppu.PPUMASK }, func(val byte) { ppu.PPUMASK = val }},
0x2002: &MappedRegister{ppu.ReadPPUStatus, func(val byte) { ppu.PPUSTATUS = val }},
0x2003: &MappedRegister{func(debug bool) byte { return ppu.OAMADDR }, func(val byte) { ppu.OAMADDR = val }},
0x2004: &MappedRegister{ppu.ReadOAMDATA, ppu.WriteOAMDATA},
0x2005: &MappedRegister{func(debug bool) byte { return ppu.PPUSCROLL }, ppu.WritePPUSCROLL},
0x2006: &MappedRegister{func(debug bool) byte { return ppu.PPUADDR }, ppu.WritePPUADDR},
0x2007: &MappedRegister{ppu.ReadPPUDATA, ppu.WritePPUDATA},
0x4014: &MappedRegister{func(debug bool) byte { return ppu.OAMDMA }, ppu.WriteOAMDMA},
}
return ppu
}