Function main

examples/core/core_window_letterbox.cpp:26–110

------------------------------------------------------------------------------------ Program main entry point ------------------------------------------------------------------------------------

// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
    const int windowWidth = 800;
    const int windowHeight = 450;

    // Enable config flags for resizable window and vertical synchro
    raylib::Window window(windowWidth, windowHeight,
        "raylib [core] example - window scale letterbox",
        FLAG_WINDOW_RESIZABLE | FLAG_VSYNC_HINT);
    window.SetMinSize(320, 240);

    int gameScreenWidth = 640;
    int gameScreenHeight = 480;

    // Render texture initialization, used to hold the rendering result so we can easily resize it
    raylib::RenderTexture2D target(gameScreenWidth, gameScreenHeight);
    target.GetTexture().SetFilter(TEXTURE_FILTER_BILINEAR); // Texture scale filter to use

    raylib::Color colors[10];
    for (int i = 0; i < 10; i++) {
        colors[i] = raylib::Color((unsigned char)GetRandomValue(100, 250), (unsigned char)GetRandomValue(50, 150), (unsigned char)GetRandomValue(10, 100), 255);
    }

    window.SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!window.ShouldClose())        // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        // Compute required framebuffer scaling
        float scale = MIN((float)GetScreenWidth()/gameScreenWidth, (float)GetScreenHeight()/gameScreenHeight);

        if (IsKeyPressed(KEY_SPACE))
        {
            // Recalculate random colors for the bars
            for (int i = 0; i < 10; i++) {
                colors[i] = raylib::Color((unsigned char)GetRandomValue(100, 250), (unsigned char)GetRandomValue(50, 150), (unsigned char)GetRandomValue(10, 100), 255);
            }
        }

        // Update virtual mouse (clamped mouse value behind game screen)
        raylib::Vector2 mouse = raylib::Mouse::GetPosition();
        raylib::Vector2 virtualMouse(
            (mouse.x - (GetScreenWidth() - (gameScreenWidth*scale))*0.5f)/scale,
            (mouse.y - (GetScreenHeight() - (gameScreenHeight*scale))*0.5f)/scale
        );
        virtualMouse = virtualMouse.Clamp(raylib::Vector2::Zero(), raylib::Vector2(gameScreenWidth, gameScreenHeight));

        // Apply the same transformation as the virtual mouse to the real mouse (i.e. to work with raygui)
        //SetMouseOffset(-(GetScreenWidth() - (gameScreenWidth*scale))*0.5f, -(GetScreenHeight() - (gameScreenHeight*scale))*0.5f);
        //SetMouseScale(1/scale, 1/scale);
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        // Draw everything in the render texture, note this will not be rendered on screen, yet