gistfile1.cpp

struct OAMData { int y, x, tile, flags; };
void render_line(int line) {
  int x,c = 0;
  struct OAMData oam_per_line[10];
  unsigned int *screen_buff = sdl_get_framebuffer();
  for(int i = 0; i < 40; i++) { // 40 * 4byte = 160byte (0xfe00 ~ )
    int y = mem_get_raw(0xfe00 + (i * 4)) - 16;
    if(line < y || line >= y + 8 + (sprite_size * 8)) continue;
    oam_per_line[i].y = y;
    oam_per_line[i].x     = mem_get_raw(0xfe00 + (i * 4) + 1) - 8;
    oam_per_line[i].tile  = mem_get_raw(0xfe00 + (i * 4) + 2);
    oam_per_line[i].flags = mem_get_raw(0xfe00 + (i * 4) + 3);
    c++;
    if(c == 10) break;
  }
  if(c) sort_sprites(oam_per_line, c);
  for(int x = 0; x < 160; x++) {
    if(line >= window_y && window_enable && line - window_y < 144) {
      xm = x;
      ym = line - window - y;
      map_select = window_tilemap_select;
    } else {
      xm = (x + scroll_x) % 256;
      ym = (line + scroll_y) % 256;
      map_select = tilemap_select;
    }
  }
}
int lcd_cycle(void) {
  int cycles = cpu_get_cycles();
  int frame, prev_line;
  if(sdl_update()) return 0;
  frame = cycles % (70244 / 4); // HBlank, Reading OAM/VRAM, VBlank period.
  lcd_line = frame / (456 / 4); // HBlank, Reading OAM/VRAM.
  if(lcd_line != prev_line && lcd_line < 144) render_line(lcd_line);
  if(prev_line == 143 && lcd_line == 144) {
    draw_stuff();
    interrupt(INTR_VBLANK);
    sdl_frame();
  }
  prev_line = lcd_line;
  return 1;
}

gistfile2.txt

uint32_t rgb888[64] = {
    0x787878, 0x2000B0, 0x2800B8, 0x6010A0, 0x982078, 0xB01030, 0xA03000, 0x784000,
    0x485800, 0x386800, 0x386C00, 0x306040, 0x305080, 0x000000, 0x000000, 0x000000,
    0xB0B0B0, 0x4060F8, 0x4040FF, 0x9040F0, 0xD840C0, 0xD84060, 0xE05000, 0xC07000,
    0x888800, 0x50A000, 0x48A810, 0x48A068, 0x4090C0, 0x000000, 0x000000, 0x000000,
    0xFFFFFF, 0x60A0FF, 0x5080FF, 0xA070FF, 0xF060FF, 0xFF60B0, 0xFF7830, 0xFFA000,
    0xE8D020, 0x98E800, 0x70F040, 0x70E090, 0x60D0E0, 0x787878, 0x000000, 0x000000,
    0xFFFFFF, 0x90D0FF, 0xA0B8FF, 0xC0B0FF, 0xE0B0FF, 0xFFB8E8, 0xFFC8B8, 0xFFD8A0,
    0xFFF090, 0xC8F080, 0xA0F0A0, 0xA0FFC8, 0xA0FFF0, 0xA0A0A0, 0x000000, 0x000000
  };
  uint32_t col888[4] = { 0xbfd3a0, 0x86986c, 0x4a553b, 0x1f1f1f };
  
  SDL_Window *window;
  SDL_Renderer *renderer;
  SDL_Texture *tex;
  
  SDL_Init(SDL_INIT_EVERYTHING);
  SDL_CreateWindowAndRenderer(GAMEBOY_SCREEN_HEIGHT, GAMEBOY_SCREEN_WIDTH, 0, &window, &renderer);
  SDL_SetWindowTitle(window,"GucchanBoy (gucchan)");
  SDL_RendererInfo info;
  SDL_GetRendererInfo(renderer, &info);
  tex = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB888, SDL_TEXTUREACCESS_STREAMING, GAMEBOY_SCREEN_WIDTH, GAMEBOY_SCREEN_HEIGHT);
  uint32_t* line;
	uint8_t* line8;
	int pitch;
	SDL_LockTexture(tex, NULL, reinterpret_cast<void**>(&line8), &pitch);
	for(int y=0;y<GAMEBOY_SCREEN_HEIGHT;y++){
		line = reinterpret_cast<uint32_t*>(line8);
		for(int x=0;x<GAMEBOY_SCREEN_WIDTH; x++) line[x] = col888[(x >> 4) & 3];
		line8+=pitch;
	}
	SDL_UnlockTexture(tex);
  
	SDL_RenderClear(renderer);
	SDL_Rect rect;
	rect.x = rect.y = 0;
	rect.w = GAMEBOY_SCREEN_WIDTH;
	rect.h = GAMEBOY_SCREEN_HEIGHT;
	SDL_RenderCopy(renderer, tex, &rect, NULL);
	SDL_RenderPresent(renderer);
  SDL_Delay(300000);