87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
#include <cmath>
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#include "generators.h"
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#include "wave.h"
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sample_table_t gen_sin()
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{
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// Make the new Wavetable object
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sample_table_t sin_vals = {0};
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// Make a place to store calculated value
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float_t val = 0;
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// Loop through number of samples and set table values
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for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
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// Calculate the value of sin at position
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val = std::sin((2 * M_PI * i) / DEFAULT_N_SAMPLES);
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sin_vals[i] = val;
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}
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// Return the completed Wavetable object
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return sin_vals;
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}
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sample_table_t gen_squ()
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{
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sample_table_t squ_vals = {0};
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// Start high and go low at halfway
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for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
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if (i < (DEFAULT_N_SAMPLES / 2)) {
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squ_vals[i] = 1;
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} else {
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squ_vals[i] = -1;
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}
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}
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return squ_vals;
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}
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sample_table_t gen_saw()
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{
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sample_table_t saw_vals = {0};
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float_t step = 2.0 / DEFAULT_N_SAMPLES; // calculate our incremental step size
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float_t val = -1; // place to store calculate value
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// Start low go high [0, 1]
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for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
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saw_vals[i] = val;
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val += step;
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}
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return saw_vals;
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}
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sample_table_t gen_tri()
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{
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sample_table_t tri_vals = {0};
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uint16_t half_samples = DEFAULT_N_SAMPLES / 2;
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float_t step = 2.0 / half_samples; // calculate our incremental step size
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float_t val = -1; // place to store calculate value
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// Start low go high then low [-1, 1, -1]
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for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
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tri_vals[i] = val;
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if (i < half_samples) {
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val += step;
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} else {
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val -= step;
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}
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}
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return tri_vals;
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}
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sample_table_t gen_isaw()
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{
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sample_table_t isaw_vals = {0};
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float_t step = 2.0 / DEFAULT_N_SAMPLES; // calculate our incremental step size
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float_t val = 1; // place to store calculate value
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// Start high go low [1, 0]
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for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
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isaw_vals[i] = val;
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val -= step;
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}
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return isaw_vals;
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}
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