diff options
Diffstat (limited to 'ppu.h')
| -rw-r--r-- | ppu.h | 15 |
1 files changed, 12 insertions, 3 deletions
@@ -7,12 +7,23 @@ #include "rom.h" struct ppu { - uint8_t oam[64*4]; uint8_t vram[2048]; + uint8_t oam[64*4]; + uint8_t oam_addr; /* $2003 */ uint8_t palette[16*2]; uint16_t cycles, scanlines; struct rom *rom; + uint8_t last_read; + + struct ppu_regs { + uint16_t v : 15; /* current vram address */ + uint16_t t : 15; /* temporary vram address */ + uint8_t x : 3; /* fine x scroll */ + uint8_t w : 1; /* first/second write toggle */ + uint8_t padding : 6; + } regs; + struct ppu_ctrl { /* $2000 */ uint8_t nmi_enable : 1; uint8_t master_slave : 1; @@ -36,8 +47,6 @@ struct ppu { uint8_t sprite_overflow : 1; uint8_t pad : 5; } status; - uint8_t oam_addr; /* $2003 */ - uint8_t oam_data; /* $2004 */ }; extern struct ppu ppu; |