66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
#ifndef timing_h
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#define timing_h
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#include "defs.h"
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typedef enum {
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GB_RTC_MODE_SYNC_TO_HOST,
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GB_RTC_MODE_ACCURATE,
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} GB_rtc_mode_t;
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/* RTC emulation mode */
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void GB_set_rtc_mode(GB_gameboy_t *gb, GB_rtc_mode_t mode);
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/* Speed multiplier for the RTC, mostly for TAS syncing */
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void GB_set_rtc_multiplier(GB_gameboy_t *gb, double multiplier);
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#ifdef GB_INTERNAL
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internal void GB_advance_cycles(GB_gameboy_t *gb, uint8_t cycles);
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internal void GB_emulate_timer_glitch(GB_gameboy_t *gb, uint8_t old_tac, uint8_t new_tac);
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internal bool GB_timing_sync_turbo(GB_gameboy_t *gb); /* Returns true if should skip frame */
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internal void GB_timing_sync(GB_gameboy_t *gb);
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internal void GB_set_internal_div_counter(GB_gameboy_t *gb, uint16_t value);
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enum {
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GB_TIMA_RUNNING = 0,
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GB_TIMA_RELOADING = 1,
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GB_TIMA_RELOADED = 2
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};
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#define GB_SLEEP(gb, unit, state, cycles) do {\
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(gb)->unit##_cycles -= (cycles) * __state_machine_divisor; \
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if (unlikely((gb)->unit##_cycles <= 0)) {\
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(gb)->unit##_state = state;\
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return;\
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unit##state:; \
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}\
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} while (0)
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#define GB_BATCHPOINT(gb, unit, state, cycles) do {\
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unit##state:; \
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if (likely(__state_machine_allow_batching && (gb)->unit##_cycles < (cycles * 2))) {\
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(gb)->unit##_state = state;\
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return;\
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}\
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} while (0)
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#define GB_BATCHED_CYCLES(gb, unit) ((gb)->unit##_cycles / __state_machine_divisor)
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#define GB_STATE_MACHINE(gb, unit, cycles, divisor) \
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static const int __state_machine_divisor = divisor;\
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(gb)->unit##_cycles += cycles; \
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if ((gb)->unit##_cycles <= 0) {\
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return;\
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}\
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switch ((gb)->unit##_state)
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#endif
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#define GB_BATCHABLE_STATE_MACHINE(gb, unit, cycles, divisor, allow_batching) \
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const bool __state_machine_allow_batching = (allow_batching); \
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GB_STATE_MACHINE(gb, unit, cycles, divisor)
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#define GB_STATE(gb, unit, state) case state: goto unit##state
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#define GB_UNIT(unit) int32_t unit##_cycles, unit##_state
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#endif /* timing_h */
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