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38 lines
996 B
38 lines
996 B
4 years ago
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#include <math.h>
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#include "crossfade.h"
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#include "../utility/dsp.h"
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#define REALLYSMALLFLOAT 0.000001f
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using namespace daisysp;
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const float kCrossLogMin = logf(REALLYSMALLFLOAT);
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const float kCrossLogMax = logf(1.0f);
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float CrossFade::Process(float &in1, float &in2)
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{
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float scalar_1, scalar_2;
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switch(curve_)
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{
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case CROSSFADE_LIN:
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scalar_1 = pos_;
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return (in1 * (1.0f - scalar_1)) + (in2 * scalar_1);
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case CROSSFADE_CPOW:
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scalar_1 = sinf(pos_ * HALFPI_F);
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scalar_2 = sinf((1.0f - pos_) * HALFPI_F);
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return (in1 * scalar_2) + (in2 * scalar_1);
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case CROSSFADE_LOG:
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scalar_1
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= expf(pos_ * (kCrossLogMax - kCrossLogMin) + kCrossLogMin);
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return (in1 * (1.0f - scalar_1)) + (in2 * scalar_1);
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case CROSSFADE_EXP:
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scalar_1 = pos_ * pos_;
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return (in1 * (1.0f - scalar_1)) + (in2 * scalar_1);
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default: return 0;
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}
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}
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