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#ifndef VDP_H_
#define VDP_H_
#include <stdint.h>
#include <stdio.h>
#define VDP_REGS 24
#define CRAM_SIZE 64
#define VSRAM_SIZE 40
#define VRAM_SIZE (64*1024)
#define LINEBUF_SIZE 320
#define FRAMEBUF_ENTRIES 320*224
#define FRAMEBUF_SIZE (FRAMEBUF_ENTRIES*sizeof(uint16_t))
#define MAX_DRAWS 40
#define MAX_SPRITES_LINE 20
enum {
REG_MODE_1=0,
REG_MODE_2,
REG_SCROLL_A,
REG_WINDOW,
REG_SCROLL_B,
REG_SAT,
REG_BG_COLOR,
REG_HINT=0xA,
REG_MODE_3,
REG_MODE_4,
REG_HSCROLL,
REG_AUTOINC=0xF,
REG_SCROLL,
REG_WINDOW_H,
REG_WINDOW_V
} vdp_regs;
typedef struct {
uint16_t address;
int16_t x_pos;
uint8_t pal_priority;
uint8_t h_flip;
} sprite_draw;
typedef struct {
uint8_t size;
uint8_t index;
int16_t y;
} sprite_info;
typedef struct {
//cycle count in MCLKs
uint32_t cycles;
uint8_t *vdpmem;
//stores 2-bit palette + 4-bit palette index + priority for current sprite line
uint8_t *linebuf;
//stores 12-bit color + shadow/highlight bits
uint16_t *framebuf;
uint16_t cram[CRAM_SIZE];
uint16_t vsram[VSRAM_SIZE];
uint8_t latched_mode;
uint16_t hscroll_a;
uint16_t hscroll_b;
uint8_t sprite_index;
uint8_t sprite_draws;
int8_t slot_counter;
int8_t cur_slot;
uint8_t regs[VDP_REGS];
sprite_draw sprite_draw_list[MAX_DRAWS];
sprite_info sprite_info_list[MAX_SPRITES_LINE];
uint16_t col_1;
uint16_t col_2;
uint8_t v_offset;
uint8_t flags;
uint8_t *tmp_buf_a;
uint8_t *tmp_buf_b;
} vdp_context;
void init_vdp_context(vdp_context * context);
void vdp_run_context(vdp_context * context, uint32_t target_cycles);
//runs from current cycle count to VBLANK for the current mode, returns ending cycle count
uint32_t vdp_run_to_vblank(vdp_context * context);
void vdp_load_savestate(vdp_context * context, FILE * state_file);
#endif //VDP_H_
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