SameBoy | Accurate GB/GBC emulator |
| download: https://git.y1.nz/archives/sameboy.tar.gz | |
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Core/timing.h
1 #pragma once
2
3 #include "defs.h"
4
5 typedef enum {
6 GB_RTC_MODE_SYNC_TO_HOST,
7 GB_RTC_MODE_ACCURATE,
8 } GB_rtc_mode_t;
9
10 /* RTC emulation mode */
11 void GB_set_rtc_mode(GB_gameboy_t *gb, GB_rtc_mode_t mode);
12
13 /* Speed multiplier for the RTC, mostly for TAS syncing */
14 void GB_set_rtc_multiplier(GB_gameboy_t *gb, double multiplier);
15
16 #ifdef GB_INTERNAL
17 internal void GB_advance_cycles(GB_gameboy_t *gb, uint8_t cycles);
18 internal void GB_emulate_timer_glitch(GB_gameboy_t *gb, uint8_t old_tac, uint8_t new_tac);
19 internal bool GB_timing_sync_turbo(GB_gameboy_t *gb); /* Returns true if should skip frame */
20 internal void GB_timing_sync(GB_gameboy_t *gb);
21 internal void GB_set_internal_div_counter(GB_gameboy_t *gb, uint16_t value);
22 internal void GB_serial_master_edge(GB_gameboy_t *gb);
23 internal void GB_rtc_set_time(GB_gameboy_t *gb, uint64_t time);
24
25 #define GB_SLEEP(gb, unit, state, cycles) do {\
26 (gb)->unit##_cycles -= (cycles) * __state_machine_divisor; \
27 if (unlikely((gb)->unit##_cycles <= 0)) {\
28 (gb)->unit##_state = state;\
29 return;\
30 unit##state:; \
31 }\
32 } while (0)
33
34 #define GB_BATCHPOINT(gb, unit, state, cycles) do {\
35 unit##state:; \
36 if (likely(__state_machine_allow_batching && (gb)->unit##_cycles < (cycles * 2))) {\
37 (gb)->unit##_state = state;\
38 return;\
39 }\
40 } while (0)
41
42 #define GB_BATCHED_CYCLES(gb, unit) ((gb)->unit##_cycles / __state_machine_divisor)
43
44 #define GB_STATE_MACHINE(gb, unit, cycles, divisor) \
45 static const int __state_machine_divisor = divisor;\
46 (gb)->unit##_cycles += cycles; \
47 if ((gb)->unit##_cycles <= 0) {\
48 return;\
49 }\
50 switch ((gb)->unit##_state)
51
52 #define GB_BATCHABLE_STATE_MACHINE(gb, unit, cycles, divisor, allow_batching) \
53 const bool __state_machine_allow_batching = (allow_batching); \
54 GB_STATE_MACHINE(gb, unit, cycles, divisor)
55
56 #define GB_STATE(gb, unit, state) case state: goto unit##state
57 #endif
58
59 #define GB_UNIT(unit) int32_t unit##_cycles, unit##_state
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