mirror of https://github.com/bsnes-emu/bsnes.git
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
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auto PPU::getVramAddress() -> uint16 {
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uint16 addr = regs.vram_addr;
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switch(regs.vram_mapping) {
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case 0: break; //direct mapping
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case 1: addr = (addr & 0xff00) | ((addr & 0x001f) << 3) | ((addr >> 5) & 7); break;
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case 2: addr = (addr & 0xfe00) | ((addr & 0x003f) << 3) | ((addr >> 6) & 7); break;
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case 3: addr = (addr & 0xfc00) | ((addr & 0x007f) << 3) | ((addr >> 7) & 7); break;
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}
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return (addr << 1);
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}
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auto PPU::vramRead(uint addr) -> uint8 {
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uint8 data = 0x00;
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if(regs.display_disable || vcounter() >= vdisp()) {
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data = vram[addr];
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debugger.vram_read(addr, data);
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}
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return data;
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}
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auto PPU::vramWrite(uint addr, uint8 data) -> void {
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if(regs.display_disable || vcounter() >= vdisp()) {
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vram[addr] = data;
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debugger.vram_write(addr, data);
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}
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}
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auto PPU::oamRead(uint addr) -> uint8 {
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uint8 data = oam[addr];
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debugger.oam_read(addr, data);
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return data;
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}
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auto PPU::oamWrite(uint addr, uint8 data) -> void {
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oam[addr] = data;
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sprite.update(addr, data);
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debugger.oam_write(addr, data);
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}
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auto PPU::cgramRead(uint addr) -> uint8 {
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uint8 data = cgram[addr];
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debugger.cgram_read(addr, data);
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return data;
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}
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auto PPU::cgramWrite(uint addr, uint8 data) -> void {
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cgram[addr] = data;
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debugger.cgram_write(addr, data);
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}
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