169 lines
3.4 KiB
C
169 lines
3.4 KiB
C
#ifndef GB_H
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#define GB_H
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#include <ragb_sdl.h>
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#include <r_io.h>
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#include <r_arch.h>
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#include <r_esil.h>
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enum {
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GB_TIMERS_DIV = 0,
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GB_TIMERS_TIMA,
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GB_TIMERS_TMA,
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GB_TIMERS_TAC,
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GB_TIMERS_N_REGS,
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};
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typedef struct gb_timers_t {
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ut64 seek;
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ut32 fd;
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ut16 odiv;
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ut16 div;
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ut8 buf[4];
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ut8 otma;
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st8 tima_wait;
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bool check_fedge;
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} GBTimers;
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GBTimers *gb_timers_open(RIO *io);
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void gb_timers_update(GBTimers *timers, ut32 cycles);
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void gb_timers_close(GBTimers *timers, RIO *io);
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typedef struct gb_joypad_t {
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ut8 *keys;
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int fd;
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ut16 up;
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ut16 down;
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ut16 left;
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ut16 right;
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ut16 a;
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ut16 b;
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ut16 start;
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ut16 select;
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ut8 data;
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ut8 odata;
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} GBJoypad;
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GBJoypad *gb_joypad_open(RIO *io);
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void gb_joypad_update(GBJoypad *joypad);
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void gb_joypad_close(GBJoypad *joypad, RIO *io);
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typedef struct gb_dma_t {
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ut64 seek; //17 bit seek and some flags
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int dma_fd; //fd representing the dma register
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int dma_bus_fd; //fd representing the memory bus while dma occupies it
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int oam_fd; //fd representing oam
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ut32 dma_bank_id;
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ut32 default_bank_id;
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// ut16 bus_occupancy_size;
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ut8 buf[0xa0];
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ut8 dst; //current dst addr low byte
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// ut8 todo; //cycles todo
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st8 frontrun; //cycles that read/write ops had frontrun the dma copy
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ut8 val;
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} GBDMA;
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#define GB_DMA_LAUNCH 0x20000
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#define GB_DMA_RUNNING 0x40000
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#define GB_DMA_ACTIVE 0x60000
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#define GB_DMA_CGB_MODE 0x80000
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GBDMA *gb_dma_open(RIO *io);
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//void gb_dma_enable_cgb(GBDMA *dma);
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void gb_dma_update(GBDMA *dma, RIO *io, ut32 cycles, bool pre_exec);
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void gb_dma_close(GBDMA *dma, RIO *io);
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enum {
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GB_PPU_LCDC = 0, //0xff40
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GB_PPU_STAT, //0xff41
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GB_PPU_SCY, //0xff42
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GB_PPU_SCX, //0xff43
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GB_PPU_LY, //0xff44
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GB_PPU_LYC, //0xff45
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GB_PPU_BGP, //0xff47
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GB_PPU_OBP0, //0xff48
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GB_PPU_OBP1, //0xff49
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GB_PPU_WY, //0xff4a
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GB_PPU_WX, //0xff4b
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GB_PPU_N_REGS,
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};
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#define GB_PPU_LCDC_BIG_OBJ 0x4
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#define GB_PPU_LCDC_BG_TILE_MAP 0x8
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#define GB_PPU_LCDC_TILE_BASE 0x10
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#define GB_PPU_LCDC_WIN_TILE_MAP 0x40
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enum {
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GB_PPU_STAT_MODE_HBLANK = 0,
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GB_PPU_STAT_MODE_VBLANK,
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GB_PPU_STAT_MODE_OAM_SCAN,
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GB_PPU_STAT_MODE_RENDER,
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};
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#define GB_PPU_STAT_MODE_MASK 0x3
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typedef struct oam_scan_table {
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ut16 data[10]; //low byte is x coordinate of sprite; high byte is addr of entry (0xffe0 + high byte)
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ut8 n_entries; //max 10
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ut8 addr;
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} OAMScanTable;
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typedef struct pixel_fifo_fetch_t {
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ut32 fetched;
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ut16 addr;
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ut8 data[2];
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ut8 state_ctr;
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} PixelFifoFetch;
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#define GB_PIXEL_FIFO_FETCH_SELECT 0x10
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#define GB_PIXEL_FIFO_FETCH_WINDOW 0x20
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typedef struct pixel_fifo_t {
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ut64 data;
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PixelFifoFetch fetch[2];
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ut8 shift_out; //lower nibble is sourch info, pallet, color
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// 0b....spcc
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#if 0
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bg - 00
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win - 01
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obj p0 - 10
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obj p1 - 11
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#endif
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ut8 n_fpixel; //number of pixel that are currently in the fifo
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ut8 x;
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} PixelFifo;
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typedef struct gb_dmg_ppu_t {
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GBPixBuf *pixbuf;
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ut64 seek;
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ut8 buf[GB_PPU_N_REGS];
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OAMScanTable ost;
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PixelFifo fifo;
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int reg_fd;
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int vram_fd;
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ut32 vram_mapid;
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ut32 oam_mapid;
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} GBPPU;
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typedef struct gameboy_t {
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RIO *io;
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RArch *arch;
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GBTimers *timers;
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GBJoypad *joypad;
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GBDMA *dma;
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GBPPU *ppu;
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ut64 addr;
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int cartrigde_fd;
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bool double_speed;
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} GB;
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GBPPU *gb_ppu_open (RIO *io, SDL_Renderer *renderer);
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void gb_ppu_update (GB *gb, ut32 cycles);
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void gb_ppu_close (GBPPU *ppu, RIO *io);
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extern RIOPlugin r_io_plugin_gb_timers;
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extern RIOPlugin r_io_plugin_gb_mbc1;
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extern RIOPlugin r_io_plugin_gb_mbc2;
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extern RIOPlugin r_io_plugin_gb_joypad;
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#endif
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