--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vdp.h	Sat Dec 08 02:00:54 2012 -0800
@@ -0,0 +1,80 @@
+#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;
+	uint8_t     slot_counter;
+	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     *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_