21 lines
484 B
C++
21 lines
484 B
C++
#include <psemek/audio/wave/triangle.hpp>
|
|
#include <psemek/audio/wave/generator.hpp>
|
|
#include <psemek/audio/detail/oscillator.hpp>
|
|
|
|
#include <cmath>
|
|
|
|
namespace psemek::audio
|
|
{
|
|
|
|
stream_ptr triangle_wave(float frequency)
|
|
{
|
|
auto func = [o = oscillator{frequency}]() mutable {
|
|
auto const z = o.next();
|
|
float const t = 0.5f * std::atan2(z.imag(), z.real()) / (geom::pi) + 0.5f;
|
|
return 4.f * std::abs(t - std::floor(t + 0.5f)) - 1.f;
|
|
};
|
|
|
|
return make_generator(func);
|
|
}
|
|
|
|
}
|