GBVideo

#ifndef __GBV_H__
#define __GBV_H__

#define GBV_TILE_MEMORY_SIZE   6144
#define GBV_BG_MAP_MEMORY_SIZE 1024
#define GBV_OAM_MEMORY_SIZE    160

typedef char           gbv_s8;
typedef short          gbv_s16;
typedef unsigned char  gbv_u8;
typedef unsigned short gbv_u16;

typedef unsigned char  gbv_io;

typedef enum {
    GBV_RENDER_MODE_GRAYSCALE_8,    // 0-255
    GBV_RENDER_MODE_GRAYSCALE_F32,  // normalized in intervale [0,1)
} gbv_render_mode;

typedef struct {
    gbv_u8 colors[4];
} gbv_palette;

typedef enum {
    GBV_LCDC_BG_ENABLE = 0x01,  /* enable bg display */
    GBV_LCDC_OBJ_ENABLE = 0x02, /* enable obj display */
    GBV_LCDC_OBJ_SIZE_SELECT = 0x04,    /* enable 8x16 obj mode */
    GBV_LCDC_BG_MAP_SELECT = 0x08,  /* bg tile map display select */
    GBV_LCDC_BG_DATA_SELECT = 0x10, /* bg & wnd tile data select */
    GBV_LCDC_WND_ENABLE = 0x20, /* enable wnd display */
    GBV_LCDC_WND_MAP_SELECT = 0x40, /* wnd tile map display select */
    GBV_LCDC_CTRL = 0x80,   /* enable lcd */
} gbv_lcdc_flag;

/*****************************/
/*** I/O control registers ***/
/*****************************/

/* lcd control */
extern gbv_io gbv_io_lcdc;

/*
    palettes:
        - defined as 4 packed colors at 2 bits per color
        - for objects, 00 means transparent
 */
extern gbv_io gbv_io_bgp;
extern gbv_io gbv_io_obp0;
extern gbv_io gbv_io_obp1;

/* bg scroll registers */
extern gbv_io gbv_io_scx;
extern gbv_io gbv_io_scy;

/* wnd position */
extern gbv_io gbv_io_wx;
extern gbv_io gbv_io_wy;

/*****************************/
/************ API ************/
/*****************************/

/* initialize system, provide 64k of memory */
void gbv_init(void * memory);

/* utility function for lcd control */
void gbv_lcdc_set(gbv_lcdc_flag flag);
void gbv_lcdc_reset(gbv_lcdc_flag flag);

/* return raw pointers for data specification */
gbv_u8 * ggbv_get_rom_data();
gbv_u8 * gbv_get_tile_data();
gbv_u8 * gbv_get_bg_map_data1();
gbv_u8 * gbv_get_bg_map_data2();
gbv_u8 * gbv_get_oam_data();

/* render all data to target buffer */
void gbv_render(void * render_buffer, gbv_render_mode mode, gbv_palette * palette);

#endif