mirror of
https://github.com/mauiaaron/apple2.git
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a9307aa827
- Audio backend now specifies the sample rate and min/ideal buffer size for mono and stereo audio
- Increase maximum speaker amplitude
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* Apple // emulator for *nix
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*
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* This software package is subject to the GNU General Public License
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* version 2 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* THERE ARE NO WARRANTIES WHATSOEVER.
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*
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*/
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/*
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* 65c02 CPU Timing Support.
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*
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* Copyleft 2013 Aaron Culliney
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*
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*/
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#ifndef _TIMING_H_
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#define _TIMING_H_
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#include "common.h"
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#if !defined(NANOSECONDS_PER_SECOND)
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#define NANOSECONDS_PER_SECOND 1000000000UL
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#endif
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// timing values cribbed from AppleWin ... reference: Sather's _Understanding the Apple IIe_
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// TODO: revisit this if/when attempting to actually sync up VBL/VSYNC to actual device vsync
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// 14318181.81...
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#define _M14 (157500000.0 / 11.0)
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#define _M14_INT (157500000 / 11)
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// 65 cycles per 912 14M clocks = 1020484.45...
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#define CLK_6502 ((_M14 * 65.0) / 912.0)
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#define CLK_6502_INT ((_M14_INT * 65) / 912)
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#define CPU_SCALE_SLOWEST 0.25
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#define CPU_SCALE_FASTEST0 4.0
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#define CPU_SCALE_FASTEST 4.05
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#ifdef INTERFACE_CLASSIC
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# define CPU_SCALE_STEP_DIV 0.01
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# define CPU_SCALE_STEP 0.05
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#endif
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extern unsigned long long cycles_count_total;// cumulative cycles count from machine reset
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extern double cycles_persec_target; // CLK_6502 * current CPU scale
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extern int cycles_speaker_feedback; // current -/+ speaker requested feedback
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extern double cpu_scale_factor; // scale factor #1
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extern double cpu_altscale_factor; // scale factor #2
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extern bool is_fullspeed; // emulation in full native speed?
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extern bool alt_speed_enabled;
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extern pthread_t cpu_thread_id;
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extern pthread_mutex_t interface_mutex;
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extern pthread_cond_t cpu_thread_cond;
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extern pthread_cond_t dbg_thread_cond;
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/*
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* calculate the difference between two timespec structures
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*/
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struct timespec timespec_diff(struct timespec start, struct timespec end, bool *negative);
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/*
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* toggles CPU speed between configured values
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*/
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void timing_toggle_cpu_speed(void);
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/*
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* (dis)allow automatic adjusting of CPU speed between presently configured and max (when loading disk images).
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*/
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void timing_set_auto_adjust_speed(bool auto_adjust);
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/*
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* check whether automatic adjusting of CPU speed is configured.
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*/
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bool timing_should_auto_adjust_speed(void);
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/*
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* initialize timing
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*/
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void timing_initialize(void);
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/*
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* timing/CPU thread entry point
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*/
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void *cpu_thread(void *ignored);
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/*
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* checkpoints current cycle count and updates total (for timing-dependent I/O)
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*/
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void timing_checkpoint_cycles(void);
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#endif // whole file
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