protected override void OnRenderFrame(Rect rect)
{
// clear everything
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT | Gles.GL_STENCIL_BUFFER_BIT);
// create the SkiaSharp context
if (context == null)
{
glInterface = GRGlInterface.CreateNativeAngleInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
}
// manage the drawing surface
if (renderTarget == null || surface == null || renderTarget.Width != (int)rect.Width || renderTarget.Height != (int)rect.Height)
{
// create or update the dimensions
renderTarget?.Dispose();
renderTarget = SKGLDrawable.CreateRenderTarget((int)rect.Width, (int)rect.Height);
// create the surface
surface?.Dispose();
surface = SKSurface.Create(context, renderTarget, GRSurfaceOrigin.BottomLeft, SKColorType.Rgba8888);
}
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget, GRSurfaceOrigin.BottomLeft, SKColorType.Rgba8888));
}
// update the control
surface.Canvas.Flush();
context.Flush();
}
protected override void OnRenderFrame(Rect rect)
{
base.OnRenderFrame(rect);
if (designMode)
{
return;
}
if (!isVisible)
{
return;
}
// create the SkiaSharp context
if (context == null)
{
var glInterface = GRGlInterface.CreateNativeAngleInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
renderTarget = SKGLDrawable.CreateRenderTarget();
}
// set the size
renderTarget.Width = (int)rect.Width;
renderTarget.Height = (int)rect.Height;
// create the surface
using (var surface = SKSurface.Create(context, renderTarget))
{
// draw to the SkiaSharp surface
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget));
// flush the canvas
surface.Canvas.Flush();
}
// flush the SkiaSharp context to the GL context
context.Flush();
}