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https://github.com/RGBCube/serenity
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eec9666735
This frees up the main thread to draw the GUI. The secondary thread uses a pipe to trick the main thread's event loop to break out of select() and update() the PianoWidget. :^)
52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
#include "Music.h"
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#include "PianoWidget.h"
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#include <LibCore/CFile.h>
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#include <LibCore/CNotifier.h>
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#include <LibGUI/GApplication.h>
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#include <LibGUI/GEventLoop.h>
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#include <LibGUI/GWindow.h>
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static int s_pipefds[2];
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int main(int argc, char** argv)
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{
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GApplication app(argc, argv);
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pipe(s_pipefds);
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auto* window = new GWindow;
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window->set_title("Piano");
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window->set_rect(100, 100, 512, 512);
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auto* piano_widget = new PianoWidget;
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window->set_main_widget(piano_widget);
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window->show();
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CNotifier notifier(s_pipefds[0], CNotifier::Read);
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notifier.on_ready_to_read = [&] {
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char buffer[32];
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read(s_pipefds[1], buffer, sizeof(buffer));
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piano_widget->update();
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};
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create_thread([](void* context) -> int {
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auto* piano_widget = (PianoWidget*)context;
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CFile audio("/dev/audio");
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if (!audio.open(CIODevice::WriteOnly)) {
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dbgprintf("Can't open audio device: %s", audio.error_string());
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return 1;
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}
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for (;;) {
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u8 buffer[4096];
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piano_widget->fill_audio_buffer(buffer, sizeof(buffer));
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audio.write(buffer, sizeof(buffer));
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char ch = '!';
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write(s_pipefds[0], &ch, 1);
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}
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}, piano_widget);
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return app.exec();
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}
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