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91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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#ifndef _APU_H
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#define _APU_H
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#include <nes.h>
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// Functions/macros for direct control
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// of APU sound generation
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// enable
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#define ENABLE_PULSE0 0x1
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#define ENABLE_PULSE1 0x2
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#define ENABLE_TRIANGLE 0x4
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#define ENABLE_NOISE 0x8
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#define ENABLE_DMC 0x10
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#define APU_ENABLE(enable)\
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APU.status = (enable);
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// pulse channels
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#define DUTY_75 0xc0
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#define DUTY_50 0x80
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#define DUTY_25 0x40
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#define DUTY_12 0x00
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#define PULSE_ENVLOOP 0x20
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#define PULSE_CONSTVOL 0x10
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#define PULSE_VOLENVMASK 0xf
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#define PULSE_CH0 0
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#define PULSE_CH1 1
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#define APU_PULSE_DECAY(channel,period,duty,decay,len)\
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APU.pulse[channel].period_low = (period)&0xff;\
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APU.pulse[channel].len_period_high = (((period)>>8)&7) | ((len)<<3);\
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APU.pulse[channel].control = (duty) | (decay);
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#define APU_PULSE_SUSTAIN(channel,period,duty,vol)\
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APU.pulse[channel].period_low = (period)&0xff;\
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APU.pulse[channel].len_period_high = (((period)>>8)&7);\
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APU.pulse[channel].control = (duty) | (vol) | (PULSE_CONSTVOL|PULSE_ENVLOOP);
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#define APU_PULSE_SET_DECAY(channel,duty,decay)\
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APU.pulse[channel].control = (duty) | (decay);
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#define APU_PULSE_SET_VOLUME(channel,duty,vol)\
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APU.pulse[channel].control = (duty) | (vol) | (PULSE_CONSTVOL|PULSE_ENVLOOP);
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#define APU_PULSE_SWEEP(channel,period,shift,up)\
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APU.pulse[channel].ramp = 0x80 | (period<<4) | (up?8:0) | shift;
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#define APU_PULSE_SWEEP_DISABLE(channel)\
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APU.pulse[channel].ramp = 0;
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// triangle channel
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#define TRIANGLE_LC_HALT 0x80
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#define TRIANGLE_LC_MASK 0x7f
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#define APU_TRIANGLE_LENGTH(period,len)\
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APU.triangle.counter = 0x7f;\
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APU.triangle.period_low = (period)&0xff;\
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APU.triangle.len_period_high = (((period)>>8)&7) | ((len)<<3);
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#define APU_TRIANGLE_SUSTAIN(period)\
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APU.triangle.counter = 0xff;\
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APU.triangle.period_low = (period)&0xff;\
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APU.triangle.len_period_high = (((period)>>8)&7);
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// noise channel
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#define NOISE_ENVLOOP 0x20
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#define NOISE_CONSTVOL 0x10
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#define NOISE_VOLENVMASK 0xf
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#define NOISE_PERIOD_BUZZ 0x80
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#define APU_NOISE_SUSTAIN(_period,vol)\
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APU.noise.control = (vol) | (NOISE_ENVLOOP|NOISE_CONSTVOL);\
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APU.noise.period = (_period);
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#define APU_NOISE_DECAY(_period,_decay,_len)\
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APU.noise.control = (_decay);\
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APU.noise.period = (_period);\
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APU.noise.len = (_len);
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// initialize APU with default state
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void apu_init(void);
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#endif
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