static void Main(string[] args)
{
// Create the window and the graphics device
VeldridInit(out var window, out var graphicsDevice);
// Create a texture storage that manages textures.
// Textures in OpenWheels are represented with integer values.
// A platform-specific ITextureStorageImplementation handles texture creation,
// destruction and modification.
var texStorage = new VeldridTextureStorage(graphicsDevice);
// Create a renderer that implements the OpenWheels.Rendering.IRenderer interface
// this guy actually draws everything to the backbuffer
var renderer = new VeldridRenderer(graphicsDevice, texStorage);
// OpenWheels always requires a texture to render, so renderer implementations only need a single shader
// Even for untextured primitives we need to have a texture set. So we create a white 1x1 texture for those.
ReadOnlySpan <Color> blankSpan = stackalloc Color[] { Color.White };
var blank = texStorage.CreateTexture(1, 1, TextureFormat.Rgba32);
texStorage.SetData(blank, blankSpan);
// Our batcher lets use make calls to render lots of different primitive shapes and text.
// When we're done the batcher can export draw calls so the renderer can use them do the drawing.
// We won't use text rendering in this sample so we use the dummy text renderer.
var batcher = new Batcher(NullBitmapFontRenderer.Instance);
var first = true;
// We run the game loop here and do our drawing inside of it.
VeldridRunLoop(window, graphicsDevice, () =>
{
renderer.Clear(Color.CornflowerBlue);
// Start a new batch
batcher.Start();
// set the texture to the blank one we registered
batcher.SetTexture(blank);
// Let's draw some primitives. The API is very obvious, you can use IntelliSense to find supported shapes.
batcher.FillRect(new RectangleF(10, 10, 100, 100), Color.LimeGreen);
// Note that subsequent line segments are connected at their corners
Span <Vector2> points = stackalloc Vector2[] { new Vector2(140, 20), new Vector2(320, 20), new Vector2(320, 120), new Vector2(420, 120) };
batcher.DrawLineStrip(points, Color.Red, 20);
batcher.FillTriangle(new Vector2(500, 20), new Vector2(600, 70), new Vector2(500, 120), Color.White);
// The tessellation of the circle and corners for the rounded rectangle can be adjusted with the maxError parameter
batcher.DrawCircle(new Vector2(700, 70), 50, Color.BlueViolet, 2);
batcher.FillRoundedRect(new RectangleF(790, 10, 100, 100), 10, Color.SandyBrown);
var pa = new Vector2(50, 220);
var pb = new Vector2(150, 120);
var pc = new Vector2(250, 220);
var curve = new QuadraticBezier(pa, pb, pc);
// The segmentation for curves can be adjusted with the segmentsPerLength parameter
// Using that parameter and an (over)estimate of the length of the curve the number of segments
// is computed
batcher.DrawCurve(curve, Color.DarkGoldenrod, 2);
var o = new Vector2(0, 100);
var pd = new Vector2(200, 420);
var curve2 = new CubicBezier(pa + o, pb + o, pd, pc + o);
batcher.DrawCurve(curve2, Color.DarkOrchid, 2);
// Finish the batch and let the renderer draw everything to the back buffer.
batcher.Render(renderer);
if (first)
{
Console.WriteLine("Vertices: " + batcher.VerticesSubmitted);
Console.WriteLine("Indices: " + batcher.IndicesSubmitted);
Console.WriteLine("Batches: " + batcher.BatchCount);
first = false;
}
});
