Get Flavio's color bar demo kind of sort of working

1 files changed, 17 insertions, 1 deletions

diff --git a/vdp.h b/vdp.h
index 6c9bbf1..3016561 100644
--- a/vdp.h
+++ b/vdp.h
@@ -26,6 +26,8 @@
 #define FBUF_SRC_S 0x6000
 #define FBUF_SRC_BG 0x8000
 
+#define MCLKS_LINE 3420
+
 enum {
 	REG_MODE_1=0,
 	REG_MODE_2,
@@ -58,6 +60,17 @@ typedef struct {
 } sprite_info;
 
 typedef struct {
+	uint32_t cycle;
+	uint16_t value;
+	uint8_t  partial;
+} fifo_entry;
+
+typedef struct {
+	fifo_entry  *fifo_cur;
+	fifo_entry  *fifo_end;
+	uint16_t    address;
+	uint8_t     cd;
+	uint8_t		flags;
 	//cycle count in MCLKs
 	uint32_t    cycles;
 	uint8_t     *vdpmem;
@@ -80,7 +93,6 @@ typedef struct {
 	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;
@@ -90,5 +102,9 @@ 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);
+void vdp_control_port_write(vdp_context * context, uint16_t value);
+void vdp_data_port_write(vdp_context * context, uint16_t value);
+uint16_t vdp_control_port_read(vdp_context * context);
+uint16_t vdp_data_port_read(vdp_context * context);
 
 #endif //VDP_H_