Finish ppu, and mbc1 mapping

include/ppu.h

@@ -7,23 +7,73 @@ static const int TICKS_PER_LINE = 456;
 static const int YRES = 144;
 static const int XRES = 160;
 
+u32 target_frame_time;
+
+typedef enum {
+    FS_TILE,
+    FS_DATA0,
+    FS_DATA1,
+    FS_IDLE,
+    FS_PUSH
+} fetch_state;
+
+typedef struct _fifo_entry {
+    struct _fifo_entry *next;
+    u32 value;
+} fifo_entry;
+
+typedef struct {
+    fifo_entry *head;
+    fifo_entry *tail;
+    u32 size;  //32 bit color
+} fifo;
+
+typedef struct {
+    fetch_state cur_fetch_state;
+    fifo pixel_fifo;
+    u8 line_x;
+    u8 pushed_x;
+    u8 fetch_x;
+    u8 bgw_fetch_data[3];
+    u8 fetch_entry_data[6]; //oam data
+    u8 map_y;
+    u8 map_x;
+    u8 tile_y;
+    u8 fifo_x;
+} pixel_fifo_context;
+
 typedef struct {
     u8 y;
     u8 x;
     u8 tile;
 
-    unsigned f_cgb_pn : 3;
-    unsigned f_cgb_vram_bank : 1;
-    unsigned f_pn : 1;
-    unsigned f_x_flip : 1;
-    unsigned f_y_flip : 1;
-    unsigned f_bgp : 1;
+    u8 f_cgb_pn : 3;
+    u8 f_cgb_vram_bank : 1;
+    u8 f_pn : 1;
+    u8 f_x_flip : 1;
+    u8 f_y_flip : 1;
+    u8 f_bgp : 1;
 } oam_entry;
 
+typedef struct _oam_line_entry {
+    oam_entry entry;
+    struct _oam_line_entry *next;
+} oam_line_entry;
+
 typedef struct {
     oam_entry oam_ram[40];
     u8 vram[0x2000];
 
+    u8 line_sprite_count; // 0 to 10 sprites
+    oam_line_entry *line_sprites; //linked list of sprites
+    oam_line_entry line_entry_array[10]; //memory to use for list
+    
+    u8 fetched_entry_count;
+    oam_entry fetched_entries[3]; //entries fetched during pipeline
+    u8 window_line;
+
+    pixel_fifo_context pfc;
+
     u32 current_frame;
     u32 line_ticks;
     u32 *video_buffer;