From f591b4adf2cfe5d7cde5ecccf95879bfe09cf57a Mon Sep 17 00:00:00 2001 From: vin Date: Sat, 31 Aug 2024 22:25:12 -0400 Subject: start working on ppu --- ppu.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'ppu.h') diff --git a/ppu.h b/ppu.h index 6bc8b5a..ffd66d7 100644 --- a/ppu.h +++ b/ppu.h @@ -12,6 +12,32 @@ struct ppu { uint8_t palette[16*2]; uint16_t cycles, scanlines; struct rom *rom; + + struct ppu_ctrl { /* $2000 */ + uint8_t nmi_enable : 1; + uint8_t master_slave : 1; + uint8_t sprite_height : 1; + uint8_t bg_tile_sel : 1; + uint8_t sprite_tile_sel : 1; + uint8_t inc_mode : 1; + uint8_t nametable_sel : 2; + } ctrl; + struct ppu_mask { /* $2001 */ + uint8_t colour_emphasis : 3; + uint8_t sprite_enable : 1; + uint8_t bg_enable : 1; + uint8_t sprite_left_enable : 1; + uint8_t bg_left_enable : 1; + uint8_t grayscale : 1; + } mask; + struct ppu_status { /* $2002 */ + uint8_t vblank : 1; + uint8_t sprite0_hit : 1; + uint8_t sprite_overflow : 1; + uint8_t pad : 5; + } status; + uint8_t oam_addr; /* $2003 */ + uint8_t oam_data; /* $2004 */ }; extern struct ppu ppu; -- cgit v1.2.3