AttachAudioMixedProcessor Utils for easy callback

[nickyMcDonald]

Utilizing delegates. Attaching a callback to the audio is made much more simple.

using Raylib_cs;
using System;
using System.Numerics;

static class Synthesizer
{
    const int width = 1280;
    const int height = 960;

    static int shape = 0;       // The shape of the wave
    static float position = 0f; // The sin wave position
    static float volume = .5f;  // The sin wave amplitude
    static float pitch = .5f;   // The sin wave frequency

    static void Synth(Span<float> buffer)
    {
        for (int i = 0; i < buffer.Length; i += 2)
        {
            position += pitch / 10f;                   // Move the wave position
            position = Raymath.Wrap(position, 0f, 2f); // Wrap around
            float wave = float.SinPi(position);        // The sin wave
            if (shape == 1)
            {
                wave = float.AsinPi(wave) * 2f;        // Triangle wave
            }
            else if (shape == 2)
            {
                wave = float.Sign(wave);               // Square wave
            }
            buffer[i + 0] = wave * volume;             // Left ear
            buffer[i + 1] = wave * volume;             // Right ear
        }
    }

    static void Main()
    {
        Raylib.InitWindow(width, height, $"Raylib-cs Synthesizer");
        Raylib.SetTargetFPS(60);
        Raylib.InitAudioDevice();

        Raylib.AttachAudioMixedProcessor(Synth); // Attach the synth

        while (!Raylib.WindowShouldClose())
        {
            float frameTime = Raylib.GetFrameTime();

            if (Raylib.IsKeyDown(KeyboardKey.KEY_UP))       // Volume up
            {
                volume = Raymath.Lerp(volume, 1f, frameTime);
            }
            if (Raylib.IsKeyDown(KeyboardKey.KEY_DOWN))     // Volume down
            {
                volume = Raymath.Lerp(volume, 0f, frameTime);
            }
            if (Raylib.IsKeyDown(KeyboardKey.KEY_RIGHT))    // Higher tone
            {
                pitch = Raymath.Lerp(pitch, 1f, frameTime);
            }
            if (Raylib.IsKeyDown(KeyboardKey.KEY_LEFT))     // Lower tone
            {
                pitch = Raymath.Lerp(pitch, 0f, frameTime);
            }
            if (Raylib.IsKeyPressed(KeyboardKey.KEY_SPACE)) // Toggle shape
            {
                shape = (int)Raymath.Wrap(shape + 1, 0, 3);
            }

            Raylib.BeginDrawing();
            Raylib.ClearBackground(Color.BLACK);
            Vector2 start = new(0f, height / 2);

            for (int x = 1; x < width; x++)
            {
                float wave = float.SinPi(x * pitch / 10f);
                if (shape == 1)
                {
                    wave = float.AsinPi(wave) * 2f;
                }
                else if (shape == 2)
                {
                    wave = float.Sign(wave);
                }
                Vector2 end = new(x, (wave * volume + 1) * height / 2);
                Raylib.DrawLineEx(start, end, 4f, Color.VIOLET);
                start = end;
            }
            Raylib.EndDrawing();
        }

        Raylib.DetachAudioMixedProcessor(Synth); // Detach the synth

        Raylib.CloseAudioDevice();
        Raylib.CloseWindow();
    }
}

247164f2-50f6-4be6-b22e-5d085724efbf.mp4

[MrScautHD]

looks very well!

[chrisdill]

Thanks, merged!