/// <summary> 
/// Proof that 30k lines can be rendered with up to 3000fps in a small window, fast GPU. Even 
/// 1000fps means that 30 million lines are drawn each second. More than 30k lines are possible 
/// with multiple draw calls, but causes multiple CircularBuffer flushes and thus not faster. 
/// </summary>
[Test, Category("Slow")]
public void Draw30000LinesPerFrame()
{
    var manyLines = new DrawingTests.Line(Vector2D.Zero, new Vector2D(1280, 720), Color.Red);
    const int NumberOfRandomLines = 30000;
    var vertices = new VertexPosition2DColor[2 * NumberOfRandomLines];
    var random = Randomizer.Current;
    var viewport = Resolve<Window>().ViewportPixelSize;
    for (int i = 0; i < NumberOfRandomLines; i++)
    {
        var startPoint = new Vector2D(random.Get(0, viewport.Width), random.Get(0, viewport.Height));
        var endPoint = startPoint + new Vector2D(random.Get(-50, 50), random.Get(-50, 50));
        vertices[i * 2 + 0] = new VertexPosition2DColor(startPoint, Color.GetRandomColor());
        vertices[i * 2 + 1] = new VertexPosition2DColor(endPoint, Color.GetRandomColor());
    }
    manyLines.Set(vertices);
}

/// <summary> 
/// Proof that 30k lines can be rendered with up to 3000fps in a small window, fast GPU. Even 
/// 1000fps means that 30 million lines are drawn each second. More than 30k lines are possible 
/// with multiple draw calls, but causes multiple CircularBuffer flushes and thus not faster. 
/// </summary>
[Test, Category("Slow")]
public void Draw30000LinesPerFrame()
{
    var manyLines = new DrawingTests.Line(Vector2D.Zero, new Vector2D(1280, 720), Color.Red);
    const int NumberOfRandomLines = 30000;
    var vertices = new VertexPosition2DColor[2 * NumberOfRandomLines];
    var random = Randomizer.Current;
    var viewport = Resolve<Window>().ViewportPixelSize;
    for (int i = 0; i < NumberOfRandomLines; i++)
    {
        var startPoint = new Vector2D(random.Get(0, viewport.Width), random.Get(0, viewport.Height));
        var endPoint = startPoint + new Vector2D(random.Get(-50, 50), random.Get(-50, 50));
        vertices[i * 2 + 0] = new VertexPosition2DColor(startPoint, Color.GetRandomColor());
        vertices[i * 2 + 1] = new VertexPosition2DColor(endPoint, Color.GetRandomColor());
    }
    manyLines.Set(vertices);
}

/// <summary> 
/// Draws 100*100 small images (=10000 images =20000 polygons) 50 times a frame to reach 1 million 
/// polygons drawn per frame. Can reach 100fps or more, which means 100 million polygons per second. 
/// </summary>
[Test, Category("Slow")]
public void DrawImagesWithOneMillionPolygonsPerFrame()
{
    var verticesAndIndices = CreateVerticesAndIndices();
    verticesAndIndices.OnDraw<RenderOneMillionPolygons>();
}

/// <summary> 
/// Draws 100*100 small images (=10000 images =20000 polygons) 50 times a frame to reach 1 million 
/// polygons drawn per frame. Can reach 100fps or more, which means 100 million polygons per second. 
/// </summary>
[Test, Category("Slow")]
public void DrawImagesWithOneMillionPolygonsPerFrame()
{
    var verticesAndIndices = CreateVerticesAndIndices();
    verticesAndIndices.OnDraw<RenderOneMillionPolygons>();
}

[Test, ApproveFirstFrameScreenshot]
public void DrawRedLine()
{
    new Line(Vector2D.Zero, new Vector2D(1280, 720), Color.Red);
    RunAfterFirstFrame(
        () => Assert.AreEqual(2, Resolve<Drawing>().NumberOfDynamicVerticesDrawnThisFrame));
}

[Test, ApproveFirstFrameScreenshot]
public void DrawRedLine()
{
    new Line(Vector2D.Zero, new Vector2D(1280, 720), Color.Red);
    RunAfterFirstFrame(
        () => Assert.AreEqual(2, Resolve<Drawing>().NumberOfDynamicVerticesDrawnThisFrame));
}