116 lines
2.4 KiB
C++
116 lines
2.4 KiB
C++
#include <psemek/audio/engine.hpp>
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#include <psemek/audio/wave/silence.hpp>
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#include <psemek/audio/wave/sine.hpp>
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#include <psemek/audio/wave/sawtooth.hpp>
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#include <psemek/audio/wave/square.hpp>
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#include <psemek/audio/wave/triangle.hpp>
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#include <psemek/audio/effect/volume.hpp>
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#include <psemek/audio/effect/fade_in.hpp>
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#include <psemek/audio/effect/fade_out.hpp>
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#include <psemek/audio/duplicate.hpp>
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#include <psemek/audio/stereo.hpp>
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#include <psemek/audio/mixer.hpp>
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#include <psemek/app/app.hpp>
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#include <psemek/app/main.hpp>
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#include <psemek/util/clock.hpp>
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#include <psemek/geom/constants.hpp>
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#include <map>
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using namespace psemek;
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static std::map<SDL_Keycode, int> const key_to_midi
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{
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{SDLK_z, 59},
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{SDLK_x, 60},
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{SDLK_c, 61},
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{SDLK_v, 62},
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{SDLK_b, 63},
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{SDLK_n, 64},
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{SDLK_m, 65},
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{SDLK_COMMA, 66},
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{SDLK_PERIOD, 67},
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{SDLK_SLASH, 68},
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{SDLK_a, 69},
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{SDLK_s, 70},
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{SDLK_d, 71},
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{SDLK_f, 72},
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{SDLK_g, 73},
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{SDLK_h, 74},
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{SDLK_j, 75},
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{SDLK_k, 76},
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{SDLK_l, 77},
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{SDLK_SEMICOLON, 78},
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{SDLK_QUOTE, 79},
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{SDLK_q, 80},
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{SDLK_w, 81},
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{SDLK_e, 82},
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{SDLK_r, 83},
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{SDLK_t, 84},
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{SDLK_y, 85},
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{SDLK_u, 86},
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{SDLK_i, 87},
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{SDLK_o, 88},
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{SDLK_p, 89},
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{SDLK_LEFTBRACKET, 90},
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{SDLK_RIGHTBRACKET, 91},
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};
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struct audio_app
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: app::app
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{
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audio_app()
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: app::app("Audio example")
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{
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mixer_ = audio::make_mixer();
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volume_control_ = audio::volume_stereo(mixer_, 0.5f, 0.5f, 0.1f);
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engine_.output()->stream(volume_control_);
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}
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void on_key_down(SDL_Keycode key) override
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{
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app::app::on_key_down(key);
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if (key_to_midi.contains(key) && !channels_.contains(key))
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{
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int midi = key_to_midi.at(key);
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auto tone = audio::sine_wave(440.f * std::pow(2.f, (midi - 69) / 12.f));
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channels_[key] = mixer_->add(audio::fade_in(tone, 0.01f));
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}
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}
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void on_key_up(SDL_Keycode key) override
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{
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app::app::on_key_up(key);
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if (channels_.contains(key))
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{
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auto & ch = channels_[key];
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if (auto s = ch->stream())
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ch->stream(audio::fade_out(s, 0.01f));
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channels_.erase(key);
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}
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}
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void update() override
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{
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float const time = clock_.count();
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float volume = std::sin(time);
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volume_control_->gain_left(0.5f + 0.5f * volume);
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volume_control_->gain_right(0.5f - 0.5f * volume);
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}
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private:
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audio::engine engine_;
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audio::mixer_ptr mixer_;
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std::shared_ptr<audio::volume_control_stereo> volume_control_;
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std::map<SDL_Keycode, audio::channel_ptr> channels_;
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util::clock<> clock_;
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};
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int main()
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{
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return app::main<audio_app>();
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}
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