ZealOS/src/Home/Tracker/Oscilloscope.ZC

// Globals
U32 *gSharedBuffer;
I64 gSharedBufferPosition = 0;
I64 gSharedBufferSize;

// Initialize shared buffer
U0 InitSharedBuffer(I64 size) {
    gSharedBuffer = MAlloc(size * sizeof(U32));
    gSharedBufferSize = size;
    gSharedBufferPosition = 0;
}

// Update shared buffer in your audio playback function
U0 UpdateSharedBuffer(U32 *buffer, I64 size) {
	I64 i;
    for (i = 0; i < size; i++) {
        gSharedBuffer[gSharedBufferPosition] = buffer[i];
        gSharedBufferPosition = (gSharedBufferPosition + 1) % gSharedBufferSize;
    }
}
U0 OscilloscopeDraw() {
    I64 i, y;
    //GrClear(0); // Clear the screen

    I64 startPosition = gSharedBufferPosition;
    for (i = 0; i < 400; i++) {
        I16 sample_value = (gSharedBuffer[startPosition] & 0xFFFF) - 32768;  // extract left channel and center around 0
        F64 normalized_sample = ToF64(sample_value) / 32768.0;
        y = 300 / 2 - (normalized_sample * 300 / 2);

        GrPlot(i, y, WHITE);  // Using GrPlot instead of DrawPoint
            
        startPosition = (startPosition + 1) % gSharedBufferSize;
    }
}

// Oscilloscope task
U0 OscilloscopeTask() {
    // Fs->draw_it = &OscilloscopeDraw; // Set the draw callback

	while (TRUE)
	{
		Refresh;
	}
    
}

U0 StartOscilloscope() {
    InitSharedBuffer(44100);  // For example, buffer to store 1 second of audio at 44100Hz

    // SettingsPush();  // Push current settings
    // Fs->win_width = 400;  // Width of the oscilloscope window
    // Fs->win_height = 300;  // Height of the oscilloscope window
    WinHorz((TEXT_COLS / 2) - 200,
            (TEXT_COLS / 2) - 200 + (200 - 1),
            Fs);
    WinVert((TEXT_ROWS / 2) - 150,
            (TEXT_ROWS / 2) - 150 + (Fs->win_height - 1),
            Fs);
    // Fs->border_src  = BDS_CONST;
    // Fs->border_attr = LTGREEN << 4 + WHITE;
    // StrCopy(Fs->task_title, "Oscilloscope");
    
    Fs->draw_it = &OscilloscopeDraw; // Set the draw callback

	while (TRUE)
	{
		Refresh;
	}
    // Spawn("Oscilloscope", OscilloscopeTask);  // Start the oscilloscope task
    
    // SettingsPop();  // Pop settings
}