//////////////////////////////////////////////////////////////////////////////////
// 本程序移植自网友ye781205的NES模拟器工程
// ALIENTEK STM32F407开发板
// NES APU 驱动代码
// 正点原子@ALIENTEK
// 技术论坛:www.openedv.com
// 创建日期:2014/7/1
// 版本：V1.0
//////////////////////////////////////////////////////////////////////////////////

#ifndef __NES_PPU_H
#define __NES_PPU_H

#include "nes_main.h"

#undef NULL
#define NULL 0

#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif

static const unsigned int NES_Palette[64] = {
    0x73AE, 0x20D1, 0x0015, 0x4013, 0x880E, 0xA802, 0xA000, 0x7840,
    0x4160, 0x0220, 0x0280, 0x01E2, 0x19EB, 0x0000, 0x0000, 0x0000,
    0xBDF7, 0x039D, 0x21DD, 0x801E, 0xB817, 0xE00B, 0xD940, 0xCA61,
    0x8B80, 0x04A0, 0x0540, 0x0487, 0x0411, 0x0000, 0x0000, 0x0000,
    0xF79E, 0x3DFF, 0x5CBF, 0xA45F, 0xF3DF, 0xFBB6, 0xFBAC, 0xFCC7,
    0xF5E7, 0x8682, 0x4EE9, 0x5FD3, 0x075B, 0x0000, 0x0000, 0x0000,
    0xF79E, 0xAF3F, 0xC6BF, 0xD65F, 0xFE3F, 0xFE3B, 0xFDF6, 0xFED5,
    0xFF34, 0xE7F4, 0xAF97, 0xB7F9, 0x9FFE, 0x0000, 0x0000, 0x0000};

/*
static  unsigned int NES_Palette[64]=
{
        0x73AE,0x20D1,0x0015,0x4013,0x880E,0xA802,0xA000,0x7840,
        0x4160,0x0220,0x0280,0x01E2,0x19EB,0x0000,0x0000,0x0000,
        0xBDF7,0x039D,0x21DD,0x801E,0xB817,0xE00B,0xD940,0xCA61,
        0x8B80,0x04A0,0x0540,0x0487,0x0411,0x0000,0x0000,0x0000,
        0xF79E,0x3DFF,0x5CBF,0xA45F,0xF3DF,0xFBB6,0xFBAC,0xFCC7,
        0xF5E7,0x8682,0x4EE9,0x5FD3,0x075B,0x0000,0x0000,0x0000,
        0xF79E,0xAF3F,0xC6BF,0xD65F,0xFE3F,0xFE3B,0xFDF6,0xFED5,
        0xFF34,0xE7F4,0xAF97,0xB7F9,0x9FFE,0x0000,0x0000,0x0000
};
*/

extern uint8_t
    *VROM_banks; // VROM开始地址 图案表*************************************
extern uint8_t *VROM_tiles;
extern uint8_t *PPU_VRAM_banks[12];
extern uint8_t *PPU_tile_banks[8];
extern uint8_t *PPU_patterntables; // 8192//VROM开始地址
                                 // 图案表*************************************
extern uint8_t *spr_ram; // sprite ram

enum {
  NES_SCREEN_WIDTH = 256,
  NES_SCREEN_HEIGHT = 240,
  SIDE_MARGIN = 8,
  NES_SCREEN_WIDTH_VIEWABLE = NES_SCREEN_WIDTH,
  NES_BACKBUF_WIDTH = NES_SCREEN_WIDTH + (2 * SIDE_MARGIN)
};
enum { BG_WRITTEN_FLAG = 0x01, SPR_WRITTEN_FLAG = 0x02 };

typedef struct {
  uint32_t in_vblank;
  uint32_t current_frame_line;
  uint16_t bg_pattern_table_addr;
  uint16_t spr_pattern_table_addr;
  uint16_t ppu_addr_inc;
  uint16_t loopy_v; // vram address -- used for reading/writing through $2007
                  // see loopy-2005.txt
  uint16_t loopy_t; // temp vram address
  uint8_t loopy_x;  // 3-bit subtile x-offset
  uint8_t toggle_2005_2006;
  uint8_t spr_ram_rw_ptr; // sprite ram read/write pointer内存读/写指针
  uint8_t read_2007_buffer;
  uint8_t LowRegs[0x08];
  uint8_t bg_pal[0x10]; // extern BYTE BGPal[0x20];
                      // //背景调色板
  uint8_t spr_pal[0x10]; // extern BYTE SPPal[0x20];
                       // //精灵调色板

  uint8_t PPU_nametables[4 * 0x400]; // 4096  PPU真正的的RAM
  // Rick
  uint8_t *PPU_VRAM_banks[12];
  uint8_t *PPU_tile_banks[8];
  uint8_t *PPU_tile_tables;
  uint8_t solid_buf[NES_BACKBUF_WIDTH];    // 当前像素的位标志线
  uint8_t dummy_buffer[NES_BACKBUF_WIDTH]; // used to do sprite 0 hit detection
                                         // when we aren't supposed to draw

} ppu_data;

extern ppu_data *ppu;
extern uint8_t *spr_ram;

uint32_t spr_enabled(void);
uint32_t bg_enabled(void);
void set_name_table(uint8_t bank, int bank_num);
void set_tile_bank(int i, uint8_t *bank);
void compile(int count, uint8_t *src, uint8_t *dest);
void set_tile_banks(uint8_t *bank0, uint8_t *bank1, uint8_t *bank2, uint8_t *bank3,
                    uint8_t *bank4, uint8_t *bank5, uint8_t *bank6, uint8_t *bank7);
void PPU_reset(void *lcd_addr);
void PPU_start_frame(void);
void set_mirroring(uint32_t nt0, uint32_t nt1, uint32_t nt2,
                   uint32_t nt3); // 设置垂直水平镜像
uint8_t ReadLowRegs(uint32_t addr);
void WriteLowRegs(uint32_t addr, uint8_t data);
void scanline_draw(int LineNo);
void do_scanline_and_draw(uint8_t *buf);

// Rick
void start_frame(uint8_t *buf, int ypitch);
void end_frame(uint8_t *buf);
void do_scanline_and_dont_draw(int LineNo);
uint32_t NMI_enabled(void);
void start_vblank(void);
void end_vblank(void);
void render_bg(uint8_t *buf);
void render_spr(uint8_t *buf);
void update_tile(int byteOffset, uint8_t data);

#endif