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Refactor audio stream stuff into sound source class
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| Original file line number | Diff line number | Diff line change |
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@@ -20,6 +20,7 @@ set(SOURCE_FILES | |
| src/screen.cpp | ||
| src/assembly.cpp | ||
| src/keyboard.cpp | ||
| src/sound.cpp | ||
| src/toml_impl.cpp | ||
| ) | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| #include "sound.h" | ||
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| #include <cmath> | ||
| #include <spdlog/spdlog.h> | ||
| #include <raylib.h> | ||
| #include <imgui.h> | ||
| #include <random> | ||
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| void SoundSource::initialize() { | ||
| SetAudioStreamBufferSizeDefault(kMaxSamplesPerUpdate); | ||
| stream = LoadAudioStream(kAudioSampleRate, kAudioSampleSize, kAudioNumChannels); | ||
| PlayAudioStream(stream); | ||
| } | ||
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| void SoundSource::cleanup() { | ||
| StopAudioStream(stream); | ||
| UnloadAudioStream(stream); | ||
| } | ||
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| void SoundSource::update(bool play_sound) { | ||
| if (!IsAudioStreamProcessed(stream)) { | ||
| return; | ||
| } | ||
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| gen_sound_data(play_sound, buffer.data(), buffer.size()); | ||
| UpdateAudioStream(stream, buffer.data(), buffer.size()); | ||
| } | ||
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| void WaveGeneratorSource::render() { | ||
| static const char* const wave_type_names[] = { | ||
| "Sine", | ||
| "Square", | ||
| "Triangle", | ||
| "Sawtooth", | ||
| "Noise", | ||
| }; | ||
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| if (ImGui::BeginCombo("Type", wave_type_names[wave_type])) { | ||
| for (int n = 0; n < IM_ARRAYSIZE(wave_type_names); n += 1) { | ||
| bool is_selected = wave_type == n; | ||
| if (ImGui::Selectable(wave_type_names[n], is_selected)) { | ||
| wave_type = n; | ||
| } | ||
| if (is_selected) { | ||
| ImGui::SetItemDefaultFocus(); | ||
| } | ||
| } | ||
| ImGui::EndCombo(); | ||
| } | ||
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| std::array<float, 100> samples; | ||
| for (int n = 0; n < 100; n += 1) { | ||
| samples[n] = sinf(n * 0.2f + ImGui::GetTime() * 5.f); | ||
| } | ||
| ImGui::PlotLines("Sound", samples.data(), samples.size(), 0, nullptr, -1.5f, 1.5f, ImVec2(0, 80.0f)); | ||
| ImGui::SliderFloat("Volume", &volume, 0.0f, 100.0f); | ||
| ImGui::SliderFloat("Frequency", &frequency, 10.0f, 2048.0f); | ||
| ImGui::Checkbox("Force Play", &force_play); | ||
| } | ||
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| static inline float noise(float idx) { | ||
| static std::random_device rd; | ||
| static std::mt19937 gen(rd()); | ||
| static std::uniform_real_distribution<> dist(-1.0f, 1.0f); | ||
| return dist(gen); | ||
| } | ||
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| static inline float sine_wave(float idx) { | ||
| return std::sin(2 * PI * idx); | ||
| } | ||
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| static inline float square_wave(float idx) { | ||
| float s = sine_wave(idx); | ||
| if (std::abs(s) <= 0.001f) { | ||
| return 0.f; | ||
| } | ||
| return std::abs(s) / s; | ||
| } | ||
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| static inline float triangle_wave(float idx) { | ||
| return std::abs(fmod((idx - 0.25f), 1.0f) - 0.5f) * 4 - 1; | ||
| } | ||
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| static inline float sawtooth_wave(float idx) { | ||
| return 0; | ||
| } | ||
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| void WaveGeneratorSource::gen_sound_data(bool play_sound, short buffer[], size_t buffer_size) { | ||
| if (!play_sound && !force_play) { | ||
| memset(buffer, 0, sizeof(short) * buffer_size); | ||
| return; | ||
| } | ||
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| float incr = frequency / static_cast<float>(kAudioSampleRate); | ||
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| auto wave_func = ([this]() { | ||
| switch (wave_type) { | ||
| case 0: return sine_wave; | ||
| case 1: return square_wave; | ||
| case 2: return triangle_wave; | ||
| case 3: return sawtooth_wave; | ||
| default: return noise; | ||
| } | ||
| })(); | ||
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| for (int i = 0; i < buffer_size; i++) { | ||
| buffer[i] = static_cast<short>(((1 << 15) - 1) * wave_func(wave_idx) * (volume / 100.0f)); | ||
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| wave_idx += incr; | ||
| if (wave_idx > 1.0f) | ||
| wave_idx -= 1.0f; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| #pragma once | ||
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| #include <raylib.h> | ||
| #include <array> | ||
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| constexpr int kMaxSamplesPerUpdate = 4096; | ||
| constexpr int kAudioSampleRate = 44100; | ||
| constexpr int kAudioSampleSize = 16; | ||
| constexpr int kAudioNumChannels = 1; | ||
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| class SoundSource { | ||
| public: | ||
| virtual void render() = 0; | ||
| virtual void gen_sound_data(bool play_sound, short buffer[], size_t buffer_size) = 0; | ||
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| virtual void initialize(); | ||
| void update(bool play_sound); | ||
| virtual void cleanup(); | ||
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| private: | ||
| AudioStream stream; | ||
| std::array<short, kMaxSamplesPerUpdate> buffer; | ||
| }; | ||
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| class WaveGeneratorSource : public SoundSource { | ||
| public: | ||
| virtual void render() override; | ||
| virtual void gen_sound_data(bool play_sound, short buffer[], size_t buffer_size) override; | ||
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| private: | ||
| bool force_play = false; | ||
| float frequency = 440.0f; | ||
| float volume = 100.0f; | ||
| float wave_idx = 0.0f; | ||
| int wave_type = 0; | ||
| }; |