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revised VDP fifo implementation

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This commit is contained in:
kub 2020-02-07 22:10:18 +01:00
parent 0f3703fd98
commit 17bd69adc6
5 changed files with 430 additions and 138 deletions
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12
pico/pico_int.h
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@ -296,6 +296,10 @@ extern SH2 sh2s[2];
// not part of real SR
#define PVS_ACTIVE (1 << 16)
#define PVS_VB2 (1 << 17) // ignores forced blanking
#define PVS_CPUWR (1 << 18) // CPU hold by FIFO full
#define PVS_CPURD (1 << 19) // CPU hold by FIFO full
#define PVS_DMAPEND (1 << 20) // DMA operation waiting for start
#define PVS_DMAFILL (1 << 21) // DMA fill is in progress
struct PicoVideo
{
@ -306,7 +310,7 @@ struct PicoVideo
unsigned short addr; // Read/Write address
unsigned int status; // Status bits (SR) and extra flags
unsigned char pending_ints; // pending interrupts: ??VH????
signed char lwrite_cnt; // VDP write count during active display line
signed char pad1; // was VDP write count
unsigned short v_counter; // V-counter
unsigned short debug; // raw debug register
unsigned char debug_p; // ... parsed: PVD_*
@ -335,7 +339,7 @@ struct PicoMisc
unsigned char eeprom_slave; // EEPROM slave word for X24C02 and better SRAMs
unsigned char eeprom_status;
unsigned char pad1; // was ym2612 status
unsigned short dma_xfers; // 18
unsigned short pad2; // 18 was dma_xfers
unsigned char eeprom_wb[2]; // EEPROM latch/write buffer
unsigned int frame_count; // 1c for movies and idle det
};
@ -419,7 +423,6 @@ struct PicoTiming
unsigned int z80c_aim;
int z80_scanline;
unsigned int dma_end; // end of current DMA op (m68k cycles)
int timer_a_next_oflow, timer_a_step; // in z80 cycles
int timer_b_next_oflow, timer_b_step;
};
@ -850,6 +853,9 @@ unsigned char PicoVideoRead8CtlL(void);
unsigned char PicoVideoRead8HV_H(void);
unsigned char PicoVideoRead8HV_L(void);
extern int (*PicoDmaHook)(unsigned int source, int len, unsigned short **base, unsigned int *mask);
void PicoVideoFIFOSync(int cycles);
int PicoVideoFIFOHint(void);
int PicoVideoFIFOWrite(int count, int byte_p, unsigned sr_mask, unsigned sr_flags);
// misc.c
PICO_INTERNAL_ASM void memcpy16bswap(unsigned short *dest, void *src, int count);