vgbc/lcd/lcd.h

#pragma once

#include <SFML/Graphics.hpp>
#include <memory/device.h>
#include <misc/types.h>
#include <lcd/palette.h>
#include <cpu/cpu.h>

class LCD;

enum LCDMode : u8 {
  ModeHBlank       = 0b000000000,
  ModeVBlank       = 0b000000001,
  ModeOAMSearch    = 0b000000010,
  ModeTransferring = 0b000000011,
};

enum RegStat : u8 {
  LycEqual         = 0b000000100,
  IntSourceHBlank  = 0b000001000,
  IntSourceVBlank  = 0b000010000,
  IntSourceOAM     = 0b000100000,
  IntSourceLYC     = 0b001000000,
};

class LCD : public Mem_device {
private:
  // Graphics
  sf::RenderTexture screenbuffer;
  sf::Image tiles[384];
  unsigned int tilemap[2][32*32];

  // Emulated device
  u8 regLY;
  u8 regLYC;
  bool intHBlank;
  bool intVBlank;
  bool intOAM;
  bool intLYC;
  LCDMode currentMode;
  Palette bgp;
  Palette obp[2];

  u8 vram_raw[0x2000];

  // misc
  Cpu& cpu;
  bool enabled;
  bool vram_dirty;

  void vram_write(u16 addr, u8 data);
  void generate_tile(int idx);
public:
  LCD(Cpu& cpu);

  virtual void write8(u16 addr, u8 data);
  virtual u8 read8(u16 addr);

  void render(sf::RenderTarget& target);
};