64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
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#include <stdio.h>
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#include <math.h>
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/*
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Copyright (c) 2020 Devine Lu Linvega
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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#define PI 3.14159265358979323846
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#define SAMPLES 256
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#define RATE 1
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typedef unsigned char Uint8;
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int
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clamp(int val, int min, int max)
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{
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return (val >= min) ? (val <= max) ? val : max : min;
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}
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Uint8
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sinw(int i)
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{
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return 0x7f * sin(i * RATE * 2 * PI / SAMPLES);
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}
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Uint8
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triw(int i)
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{
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if(i < 0x40)
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return i * 2;
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if(i >= 0xc0)
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return (i - 0xc0) * 2 - 0x7f;
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return 0x7f - (i - 0x40) * 2;
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}
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Uint8
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sqrw(int i)
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{
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return ((i * RATE) % 0xff) < 0x80 ? 0x7f : 0x80;
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}
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int
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main()
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{
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int i;
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printf("%d:\n\n", SAMPLES);
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for(i = 0; i < SAMPLES; ++i) {
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if(i % 0x10 == 0)
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printf("\n");
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else if(i % 2 == 0)
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printf(" ");
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printf("%02x", (triw(i) + sinw(i)) / 2);
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}
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printf("\n\n");
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return 0;
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}
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