131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
//
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// Created by selim on 8/22/23.
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//
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#ifndef NES_PPU_H
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#define NES_PPU_H
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#include "Cartridge.h"
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#include <cstdint>
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#include <memory>
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#include <functional>
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namespace nes {
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struct Pixel {
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uint8_t R = 0;
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uint8_t G = 0;
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uint8_t B = 0;
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uint8_t A = 0xFF;
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};
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class Ppu {
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public:
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static constexpr uint16_t SCREEN_WIDTH = 256;
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static constexpr uint16_t SCREEN_HEIGHT = 240;
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enum ControlAddress: uint16_t {
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Control = 0x0000,
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Mask = 0x0001,
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Status = 0x0002,
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OamAddress = 0x0003,
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OamData = 0x0004,
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Scroll = 0x0005,
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PpuAddress = 0x0006,
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PpuData = 0x0007
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};
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union StatusRegister {
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struct {
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uint8_t unused: 5;
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uint8_t spriteOverflow: 1;
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uint8_t spriteZeroHit: 1;
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uint8_t verticalBlank: 1;
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};
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uint8_t value;
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};
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union ControlRegister {
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struct {
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uint8_t nameTableX: 1;
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uint8_t nameTableY: 1;
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uint8_t incrementMode: 1;
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uint8_t patternSprite: 1;
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uint8_t patternBackground: 1;
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uint8_t spriteSize: 1;
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uint8_t slaveMode: 1;
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uint8_t enableNmi: 1;
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};
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uint8_t value;
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};
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union MaskRegister {
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struct {
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uint8_t grayscale: 1;
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uint8_t renderBackgroundLeft: 1;
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uint8_t renderSpritesLeft: 1;
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uint8_t renderBackground: 1;
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uint8_t renderSprites: 1;
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uint8_t enhanceRed: 1;
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uint8_t enhanceGreen: 1;
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uint8_t enhanceBlue: 1;
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};
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uint8_t value;
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};
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union LoopyRegister {
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struct {
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uint8_t coarseX : 5;
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uint8_t coarseY : 5;
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uint8_t nameTableX : 1;
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uint8_t nameTableY : 1;
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uint8_t fineY : 3;
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uint8_t unused : 1;
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};
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uint16_t value;
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};
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public:
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Ppu();
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bool tick();
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void write(uint16_t address, uint8_t value);
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uint8_t read(uint16_t address);
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void setPixel(uint16_t row, uint16_t column, Pixel pixel);
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void connect(std::shared_ptr<Cartridge> cartridge);
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public:
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std::function<void(const Pixel*)> onNewFrame;
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private:
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uint8_t internalRead(uint16_t address);
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void internalWrite(uint16_t address, uint8_t value);
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Pixel getColor(uint8_t palette, uint8_t pixel);
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private:
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int16_t _column;
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int16_t _scanline;
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StatusRegister _status;
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ControlRegister _control;
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MaskRegister _mask;
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LoopyRegister _vRamAddress;
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LoopyRegister _tRamAddress;
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bool _addressWriteInProgress;
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uint8_t _dataTemp;
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uint8_t _fineX;
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private:
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std::unique_ptr<uint8_t[]> _nameTable;
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std::unique_ptr<Pixel[]> _palette;
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std::unique_ptr<uint8_t[]> _paletteTable;
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private:
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std::unique_ptr<Pixel[]> _frameBuffer;
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std::shared_ptr<Cartridge> _cartridge;
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};
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}
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#endif //NES_PPU_H
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