mirror of
https://github.com/RetroPortingToolKit/psxrecomp
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Codex
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
#ifndef PSXRECOMP_PSX_VBLANK_CLOCK_H
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#define PSXRECOMP_PSX_VBLANK_CLOCK_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Exact rational native-cycle period generator. `fraction` is the remainder
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* after selecting `current_cycles`, which makes the five fields complete
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* deterministic save-state data once the configured ratio is fixed. */
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typedef struct PSXVBlankClock {
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uint32_t period_floor;
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uint32_t period_remainder;
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uint32_t period_denominator;
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uint32_t fraction;
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uint32_t current_cycles;
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} PSXVBlankClock;
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int psx_vblank_clock_configure(PSXVBlankClock *clock,
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uint64_t period_numerator,
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uint32_t period_denominator);
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void psx_vblank_clock_next(PSXVBlankClock *clock);
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int psx_vblank_clock_restore_fraction(PSXVBlankClock *clock,
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uint32_t fraction);
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uint64_t psx_vblank_clock_cycles_for_frames_ceil(
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const PSXVBlankClock *clock, uint32_t frames);
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uint64_t psx_vblank_clock_frames_for_cycles_floor(
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const PSXVBlankClock *clock, uint64_t cycles);
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#ifdef __cplusplus
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}
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#endif
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#endif
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