733 lines
18 KiB
C
733 lines
18 KiB
C
// -----------------------------
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// sfxr - sound effect generator
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// -----------------------------
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// by DrPetter, 2007-12-14
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// developed for LD48#10
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// -----------------------------
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//
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// License:
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// Basically, I don't care what you do with it, anything goes.
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// To please all the troublesome folks who request a formal license,
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// I attach the "MIT license".
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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#include <stdbool.h>
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#define rnd(n) (rand()%(n+1))
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#define PI 3.14159265f
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float frnd(float range)
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{
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return (float)rnd(10000)/10000*range;
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}
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typedef struct Category
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{
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char name[32];
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} Category;
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Category categories[10];
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int wave_type;
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float p_base_freq;
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float p_freq_limit;
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float p_freq_ramp;
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float p_freq_dramp;
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float p_duty;
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float p_duty_ramp;
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float p_vib_strength;
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float p_vib_speed;
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float p_vib_delay;
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float p_env_attack;
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float p_env_sustain;
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float p_env_decay;
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float p_env_punch;
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bool filter_on;
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float p_lpf_resonance;
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float p_lpf_freq;
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float p_lpf_ramp;
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float p_hpf_freq;
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float p_hpf_ramp;
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float p_pha_offset;
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float p_pha_ramp;
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float p_repeat_speed;
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float p_arp_speed;
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float p_arp_mod;
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float master_vol=0.05f;
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float sound_vol=0.5f;
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bool playing_sample=false;
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int phase;
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double fperiod;
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double fmaxperiod;
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double fslide;
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double fdslide;
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int period;
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float square_duty;
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float square_slide;
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int env_stage;
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int env_time;
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int env_length[3];
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float env_vol;
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float fphase;
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float fdphase;
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int iphase;
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float phaser_buffer[1024];
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int ipp;
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float noise_buffer[32];
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float fltp;
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float fltdp;
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float fltw;
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float fltw_d;
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float fltdmp;
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float fltphp;
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float flthp;
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float flthp_d;
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float vib_phase;
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float vib_speed;
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float vib_amp;
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int rep_time;
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int rep_limit;
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int arp_time;
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int arp_limit;
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double arp_mod;
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float* vselected=NULL;
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int vcurbutton=-1;
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int wav_bits=16;
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int wav_freq=44100;
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int file_sampleswritten;
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float filesample=0.0f;
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int fileacc=0;
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void ResetParams()
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{
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wave_type=0;
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p_base_freq=0.3f;
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p_freq_limit=0.0f;
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p_freq_ramp=0.0f;
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p_freq_dramp=0.0f;
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p_duty=0.0f;
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p_duty_ramp=0.0f;
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p_vib_strength=0.0f;
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p_vib_speed=0.0f;
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p_vib_delay=0.0f;
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p_env_attack=0.0f;
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p_env_sustain=0.3f;
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p_env_decay=0.4f;
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p_env_punch=0.0f;
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filter_on=false;
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p_lpf_resonance=0.0f;
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p_lpf_freq=1.0f;
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p_lpf_ramp=0.0f;
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p_hpf_freq=0.0f;
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p_hpf_ramp=0.0f;
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p_pha_offset=0.0f;
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p_pha_ramp=0.0f;
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p_repeat_speed=0.0f;
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p_arp_speed=0.0f;
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p_arp_mod=0.0f;
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}
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bool LoadSettings(const char* filename)
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{
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FILE* file=fopen(filename, "rb");
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if(!file)
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return false;
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int version=0;
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fread(&version, 1, sizeof(int), file);
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if(version!=100 && version!=101 && version!=102)
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return false;
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fread(&wave_type, 1, sizeof(int), file);
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sound_vol=0.5f;
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if(version==102)
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fread(&sound_vol, 1, sizeof(float), file);
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fread(&p_base_freq, 1, sizeof(float), file);
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fread(&p_freq_limit, 1, sizeof(float), file);
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fread(&p_freq_ramp, 1, sizeof(float), file);
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if(version>=101)
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fread(&p_freq_dramp, 1, sizeof(float), file);
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fread(&p_duty, 1, sizeof(float), file);
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fread(&p_duty_ramp, 1, sizeof(float), file);
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fread(&p_vib_strength, 1, sizeof(float), file);
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fread(&p_vib_speed, 1, sizeof(float), file);
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fread(&p_vib_delay, 1, sizeof(float), file);
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fread(&p_env_attack, 1, sizeof(float), file);
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fread(&p_env_sustain, 1, sizeof(float), file);
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fread(&p_env_decay, 1, sizeof(float), file);
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fread(&p_env_punch, 1, sizeof(float), file);
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fread(&filter_on, 1, sizeof(bool), file);
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fread(&p_lpf_resonance, 1, sizeof(float), file);
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fread(&p_lpf_freq, 1, sizeof(float), file);
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fread(&p_lpf_ramp, 1, sizeof(float), file);
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fread(&p_hpf_freq, 1, sizeof(float), file);
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fread(&p_hpf_ramp, 1, sizeof(float), file);
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fread(&p_pha_offset, 1, sizeof(float), file);
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fread(&p_pha_ramp, 1, sizeof(float), file);
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fread(&p_repeat_speed, 1, sizeof(float), file);
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if(version>=101)
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{
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fread(&p_arp_speed, 1, sizeof(float), file);
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fread(&p_arp_mod, 1, sizeof(float), file);
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}
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fclose(file);
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return true;
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}
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bool SaveSettings(const char* filename)
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{
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FILE* file=fopen(filename, "wb");
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if(!file)
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return false;
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int version=102;
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fwrite(&version, 1, sizeof(int), file);
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fwrite(&wave_type, 1, sizeof(int), file);
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fwrite(&sound_vol, 1, sizeof(float), file);
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fwrite(&p_base_freq, 1, sizeof(float), file);
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fwrite(&p_freq_limit, 1, sizeof(float), file);
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fwrite(&p_freq_ramp, 1, sizeof(float), file);
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fwrite(&p_freq_dramp, 1, sizeof(float), file);
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fwrite(&p_duty, 1, sizeof(float), file);
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fwrite(&p_duty_ramp, 1, sizeof(float), file);
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fwrite(&p_vib_strength, 1, sizeof(float), file);
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fwrite(&p_vib_speed, 1, sizeof(float), file);
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fwrite(&p_vib_delay, 1, sizeof(float), file);
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fwrite(&p_env_attack, 1, sizeof(float), file);
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fwrite(&p_env_sustain, 1, sizeof(float), file);
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fwrite(&p_env_decay, 1, sizeof(float), file);
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fwrite(&p_env_punch, 1, sizeof(float), file);
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fwrite(&filter_on, 1, sizeof(bool), file);
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fwrite(&p_lpf_resonance, 1, sizeof(float), file);
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fwrite(&p_lpf_freq, 1, sizeof(float), file);
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fwrite(&p_lpf_ramp, 1, sizeof(float), file);
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fwrite(&p_hpf_freq, 1, sizeof(float), file);
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fwrite(&p_hpf_ramp, 1, sizeof(float), file);
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fwrite(&p_pha_offset, 1, sizeof(float), file);
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fwrite(&p_pha_ramp, 1, sizeof(float), file);
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fwrite(&p_repeat_speed, 1, sizeof(float), file);
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fwrite(&p_arp_speed, 1, sizeof(float), file);
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fwrite(&p_arp_mod, 1, sizeof(float), file);
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fclose(file);
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return true;
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}
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void ResetSample(bool restart)
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{
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if(!restart)
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phase=0;
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fperiod=100.0/(p_base_freq*p_base_freq+0.001);
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period=(int)fperiod;
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fmaxperiod=100.0/(p_freq_limit*p_freq_limit+0.001);
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fslide=1.0-pow((double)p_freq_ramp, 3.0)*0.01;
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fdslide=-pow((double)p_freq_dramp, 3.0)*0.000001;
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square_duty=0.5f-p_duty*0.5f;
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square_slide=-p_duty_ramp*0.00005f;
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if(p_arp_mod>=0.0f)
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arp_mod=1.0-pow((double)p_arp_mod, 2.0)*0.9;
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else
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arp_mod=1.0+pow((double)p_arp_mod, 2.0)*10.0;
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arp_time=0;
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arp_limit=(int)(pow(1.0f-p_arp_speed, 2.0f)*20000+32);
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if(p_arp_speed==1.0f)
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arp_limit=0;
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if(!restart)
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{
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// reset filter
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fltp=0.0f;
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fltdp=0.0f;
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fltw=pow(p_lpf_freq, 3.0f)*0.1f;
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fltw_d=1.0f+p_lpf_ramp*0.0001f;
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fltdmp=5.0f/(1.0f+pow(p_lpf_resonance, 2.0f)*20.0f)*(0.01f+fltw);
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if(fltdmp>0.8f) fltdmp=0.8f;
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fltphp=0.0f;
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flthp=pow(p_hpf_freq, 2.0f)*0.1f;
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flthp_d=1.0+p_hpf_ramp*0.0003f;
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// reset vibrato
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vib_phase=0.0f;
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vib_speed=pow(p_vib_speed, 2.0f)*0.01f;
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vib_amp=p_vib_strength*0.5f;
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// reset envelope
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env_vol=0.0f;
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env_stage=0;
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env_time=0;
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env_length[0]=(int)(p_env_attack*p_env_attack*100000.0f);
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env_length[1]=(int)(p_env_sustain*p_env_sustain*100000.0f);
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env_length[2]=(int)(p_env_decay*p_env_decay*100000.0f);
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fphase=pow(p_pha_offset, 2.0f)*1020.0f;
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if(p_pha_offset<0.0f) fphase=-fphase;
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fdphase=pow(p_pha_ramp, 2.0f)*1.0f;
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if(p_pha_ramp<0.0f) fdphase=-fdphase;
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iphase=abs((int)fphase);
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ipp=0;
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for(int i=0;i<1024;i++)
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phaser_buffer[i]=0.0f;
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for(int i=0;i<32;i++)
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noise_buffer[i]=frnd(2.0f)-1.0f;
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rep_time=0;
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rep_limit=(int)(pow(1.0f-p_repeat_speed, 2.0f)*20000+32);
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if(p_repeat_speed==0.0f)
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rep_limit=0;
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}
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}
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void SynthSample(int length, float* buffer, FILE* file)
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{
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for(int i=0;i<length;i++)
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{
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if(!playing_sample)
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break;
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rep_time++;
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if(rep_limit!=0 && rep_time>=rep_limit)
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{
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rep_time=0;
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ResetSample(true);
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}
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// frequency envelopes/arpeggios
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arp_time++;
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if(arp_limit!=0 && arp_time>=arp_limit)
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{
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arp_limit=0;
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fperiod*=arp_mod;
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}
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fslide+=fdslide;
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fperiod*=fslide;
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if(fperiod>fmaxperiod)
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{
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fperiod=fmaxperiod;
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if(p_freq_limit>0.0f)
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playing_sample=false;
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}
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float rfperiod=fperiod;
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if(vib_amp>0.0f)
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{
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vib_phase+=vib_speed;
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rfperiod=fperiod*(1.0+sin(vib_phase)*vib_amp);
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}
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period=(int)rfperiod;
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if(period<8) period=8;
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square_duty+=square_slide;
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if(square_duty<0.0f) square_duty=0.0f;
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if(square_duty>0.5f) square_duty=0.5f;
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// volume envelope
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env_time++;
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if(env_time>env_length[env_stage])
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{
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env_time=0;
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env_stage++;
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if(env_stage==3)
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playing_sample=false;
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}
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if(env_stage==0)
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env_vol=(float)env_time/env_length[0];
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if(env_stage==1)
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env_vol=1.0f+pow(1.0f-(float)env_time/env_length[1], 1.0f)*2.0f*p_env_punch;
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if(env_stage==2)
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env_vol=1.0f-(float)env_time/env_length[2];
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// phaser step
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fphase+=fdphase;
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iphase=abs((int)fphase);
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if(iphase>1023) iphase=1023;
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if(flthp_d!=0.0f)
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{
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flthp*=flthp_d;
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if(flthp<0.00001f) flthp=0.00001f;
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if(flthp>0.1f) flthp=0.1f;
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}
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float ssample=0.0f;
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for(int si=0;si<8;si++) // 8x supersampling
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{
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float sample=0.0f;
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phase++;
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if(phase>=period)
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{
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// phase=0;
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phase%=period;
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if(wave_type==3)
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for(int i=0;i<32;i++)
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noise_buffer[i]=frnd(2.0f)-1.0f;
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}
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// base waveform
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float fp=(float)phase/period;
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switch(wave_type)
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{
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case 0: // square
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if(fp<square_duty)
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sample=0.5f;
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else
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sample=-0.5f;
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break;
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case 1: // sawtooth
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sample=1.0f-fp*2;
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break;
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case 2: // sine
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sample=(float)sin(fp*2*PI);
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break;
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case 3: // noise
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sample=noise_buffer[phase*32/period];
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break;
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}
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// lp filter
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float pp=fltp;
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fltw*=fltw_d;
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if(fltw<0.0f) fltw=0.0f;
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if(fltw>0.1f) fltw=0.1f;
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if(p_lpf_freq!=1.0f)
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{
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fltdp+=(sample-fltp)*fltw;
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fltdp-=fltdp*fltdmp;
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}
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else
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{
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fltp=sample;
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fltdp=0.0f;
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}
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fltp+=fltdp;
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// hp filter
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fltphp+=fltp-pp;
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fltphp-=fltphp*flthp;
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sample=fltphp;
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// phaser
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phaser_buffer[ipp&1023]=sample;
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sample+=phaser_buffer[(ipp-iphase+1024)&1023];
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ipp=(ipp+1)&1023;
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// final accumulation and envelope application
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ssample+=sample*env_vol;
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}
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ssample=ssample/8*master_vol;
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ssample*=2.0f*sound_vol;
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if(buffer!=NULL)
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{
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if(ssample>1.0f) ssample=1.0f;
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if(ssample<-1.0f) ssample=-1.0f;
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*buffer++=ssample;
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}
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if(file!=NULL)
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{
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// quantize depending on format
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// accumulate/count to accomodate variable sample rate?
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ssample*=4.0f; // arbitrary gain to get reasonable output volume...
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if(ssample>1.0f) ssample=1.0f;
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if(ssample<-1.0f) ssample=-1.0f;
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filesample+=ssample;
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fileacc++;
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if(wav_freq==44100 || fileacc==2)
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{
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filesample/=fileacc;
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fileacc=0;
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if(wav_bits==16)
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{
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short isample=(short)(filesample*32000);
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fwrite(&isample, 1, 2, file);
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}
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else
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{
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unsigned char isample=(unsigned char)(filesample*127+128);
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fwrite(&isample, 1, 1, file);
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}
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filesample=0.0f;
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}
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file_sampleswritten++;
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}
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}
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}
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void PlaySample()
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{
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ResetSample(false);
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playing_sample=true;
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}
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bool ExportWAV(char* filename)
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{
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FILE* foutput=fopen(filename, "wb");
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if(!foutput)
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return false;
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// write wav header
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char string[32];
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unsigned int dword=0;
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unsigned short word=0;
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fwrite("RIFF", 4, 1, foutput); // "RIFF"
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dword=0;
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fwrite(&dword, 1, 4, foutput); // remaining file size
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fwrite("WAVE", 4, 1, foutput); // "WAVE"
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fwrite("fmt ", 4, 1, foutput); // "fmt "
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dword=16;
|
|
fwrite(&dword, 1, 4, foutput); // chunk size
|
|
word=1;
|
|
fwrite(&word, 1, 2, foutput); // compression code
|
|
word=1;
|
|
fwrite(&word, 1, 2, foutput); // channels
|
|
dword=wav_freq;
|
|
fwrite(&dword, 1, 4, foutput); // sample rate
|
|
dword=wav_freq*wav_bits/8;
|
|
fwrite(&dword, 1, 4, foutput); // bytes/sec
|
|
word=wav_bits/8;
|
|
fwrite(&word, 1, 2, foutput); // block align
|
|
word=wav_bits;
|
|
fwrite(&word, 1, 2, foutput); // bits per sample
|
|
|
|
fwrite("data", 4, 1, foutput); // "data"
|
|
dword=0;
|
|
int foutstream_datasize=ftell(foutput);
|
|
fwrite(&dword, 1, 4, foutput); // chunk size
|
|
|
|
// write sample data
|
|
file_sampleswritten=0;
|
|
filesample=0.0f;
|
|
fileacc=0;
|
|
PlaySample();
|
|
while(playing_sample)
|
|
SynthSample(256, NULL, foutput);
|
|
|
|
// seek back to header and write size info
|
|
fseek(foutput, 4, SEEK_SET);
|
|
dword=0;
|
|
dword=foutstream_datasize-4+file_sampleswritten*wav_bits/8;
|
|
fwrite(&dword, 1, 4, foutput); // remaining file size
|
|
fseek(foutput, foutstream_datasize, SEEK_SET);
|
|
dword=file_sampleswritten*wav_bits/8;
|
|
fwrite(&dword, 1, 4, foutput); // chunk size (data)
|
|
fclose(foutput);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool loadPreset(int aPresetNo, int aRandSeed)
|
|
{
|
|
if (aPresetNo < 0 || aPresetNo > 6)
|
|
return false; //INVALID_PARAMETER;
|
|
|
|
ResetParams();
|
|
srand(aRandSeed);
|
|
switch(aPresetNo)
|
|
{
|
|
case 0: // pickup/coin
|
|
p_base_freq=0.4f+frnd(0.5f);
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=frnd(0.1f);
|
|
p_env_decay=0.1f+frnd(0.4f);
|
|
p_env_punch=0.3f+frnd(0.3f);
|
|
if(rnd(1))
|
|
{
|
|
p_arp_speed=0.5f+frnd(0.2f);
|
|
p_arp_mod=0.2f+frnd(0.4f);
|
|
}
|
|
break;
|
|
case 1: // laser/shoot
|
|
wave_type=rnd(2);
|
|
if(wave_type==2 && rnd(1))
|
|
wave_type=rnd(1);
|
|
p_base_freq=0.5f+frnd(0.5f);
|
|
p_freq_limit=p_base_freq-0.2f-frnd(0.6f);
|
|
if(p_freq_limit<0.2f) p_freq_limit=0.2f;
|
|
p_freq_ramp=-0.15f-frnd(0.2f);
|
|
if(rnd(2)==0)
|
|
{
|
|
p_base_freq=0.3f+frnd(0.6f);
|
|
p_freq_limit=frnd(0.1f);
|
|
p_freq_ramp=-0.35f-frnd(0.3f);
|
|
}
|
|
if(rnd(1))
|
|
{
|
|
p_duty=frnd(0.5f);
|
|
p_duty_ramp=frnd(0.2f);
|
|
}
|
|
else
|
|
{
|
|
p_duty=0.4f+frnd(0.5f);
|
|
p_duty_ramp=-frnd(0.7f);
|
|
}
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=0.1f+frnd(0.2f);
|
|
p_env_decay=frnd(0.4f);
|
|
if(rnd(1))
|
|
p_env_punch=frnd(0.3f);
|
|
if(rnd(2)==0)
|
|
{
|
|
p_pha_offset=frnd(0.2f);
|
|
p_pha_ramp=-frnd(0.2f);
|
|
}
|
|
if(rnd(1))
|
|
p_hpf_freq=frnd(0.3f);
|
|
break;
|
|
case 2: // explosion
|
|
wave_type=3;
|
|
if(rnd(1))
|
|
{
|
|
p_base_freq=0.1f+frnd(0.4f);
|
|
p_freq_ramp=-0.1f+frnd(0.4f);
|
|
}
|
|
else
|
|
{
|
|
p_base_freq=0.2f+frnd(0.7f);
|
|
p_freq_ramp=-0.2f-frnd(0.2f);
|
|
}
|
|
p_base_freq*=p_base_freq;
|
|
if(rnd(4)==0)
|
|
p_freq_ramp=0.0f;
|
|
if(rnd(2)==0)
|
|
p_repeat_speed=0.3f+frnd(0.5f);
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=0.1f+frnd(0.3f);
|
|
p_env_decay=frnd(0.5f);
|
|
if(rnd(1)==0)
|
|
{
|
|
p_pha_offset=-0.3f+frnd(0.9f);
|
|
p_pha_ramp=-frnd(0.3f);
|
|
}
|
|
p_env_punch=0.2f+frnd(0.6f);
|
|
if(rnd(1))
|
|
{
|
|
p_vib_strength=frnd(0.7f);
|
|
p_vib_speed=frnd(0.6f);
|
|
}
|
|
if(rnd(2)==0)
|
|
{
|
|
p_arp_speed=0.6f+frnd(0.3f);
|
|
p_arp_mod=0.8f-frnd(1.6f);
|
|
}
|
|
break;
|
|
case 3: // powerup
|
|
if(rnd(1))
|
|
wave_type=1;
|
|
else
|
|
p_duty=frnd(0.6f);
|
|
if(rnd(1))
|
|
{
|
|
p_base_freq=0.2f+frnd(0.3f);
|
|
p_freq_ramp=0.1f+frnd(0.4f);
|
|
p_repeat_speed=0.4f+frnd(0.4f);
|
|
}
|
|
else
|
|
{
|
|
p_base_freq=0.2f+frnd(0.3f);
|
|
p_freq_ramp=0.05f+frnd(0.2f);
|
|
if(rnd(1))
|
|
{
|
|
p_vib_strength=frnd(0.7f);
|
|
p_vib_speed=frnd(0.6f);
|
|
}
|
|
}
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=frnd(0.4f);
|
|
p_env_decay=0.1f+frnd(0.4f);
|
|
break;
|
|
case 4: // hit/hurt
|
|
wave_type=rnd(2);
|
|
if(wave_type==2)
|
|
wave_type=3;
|
|
if(wave_type==0)
|
|
p_duty=frnd(0.6f);
|
|
p_base_freq=0.2f+frnd(0.6f);
|
|
p_freq_ramp=-0.3f-frnd(0.4f);
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=frnd(0.1f);
|
|
p_env_decay=0.1f+frnd(0.2f);
|
|
if(rnd(1))
|
|
p_hpf_freq=frnd(0.3f);
|
|
break;
|
|
case 5: // jump
|
|
wave_type=0;
|
|
p_duty=frnd(0.6f);
|
|
p_base_freq=0.3f+frnd(0.3f);
|
|
p_freq_ramp=0.1f+frnd(0.2f);
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=0.1f+frnd(0.3f);
|
|
p_env_decay=0.1f+frnd(0.2f);
|
|
if(rnd(1))
|
|
p_hpf_freq=frnd(0.3f);
|
|
if(rnd(1))
|
|
p_lpf_freq=1.0f-frnd(0.6f);
|
|
break;
|
|
case 6: // blip/select
|
|
wave_type=rnd(1);
|
|
if(wave_type==0)
|
|
p_duty=frnd(0.6f);
|
|
p_base_freq=0.2f+frnd(0.4f);
|
|
p_env_attack=0.0f;
|
|
p_env_sustain=0.1f+frnd(0.1f);
|
|
p_env_decay=frnd(0.2f);
|
|
p_hpf_freq=0.1f;
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
if( argc != 3 ) exit( -printf("%s input.sfxr output.wav\n", argv[0]) );
|
|
if( argc > 1 && LoadSettings(argv[1]) ) {
|
|
if( argc > 2 && ExportWAV(argv[2]) ) {
|
|
return 0;
|
|
} else {
|
|
fprintf(stderr, "Cannot open file %s for writing\n", argv[2]);
|
|
}
|
|
} else {
|
|
fprintf(stderr, "Cannot open file %s for reading\n", argv[1]);
|
|
}
|
|
return -1;
|
|
}
|