protected override void OnRenderFrame()
{
var rect = Allocation;
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
if (glInterface == null)
{
throw new InvalidOperationException("Error creating OpenGL ES interface. Check if you have OpenGL ES correctly installed and configured or change the PFD Renderer to 'Software (CPU)' on the Global Settings panel.");
}
else
{
grContext = GRContext.Create(GRBackend.OpenGL, glInterface);
}
try
{
renderTarget = CreateRenderTarget();
}
catch (Exception ex)
{
throw new InvalidOperationException("Error creating OpenGL ES render target. Check if you have OpenGL ES correctly installed and configured or change the PFD Renderer to 'Software (CPU)' on the Global Settings panel.", ex);
}
}
if (grContext != null)
{
// update to the latest dimensions
renderTarget = new GRBackendRenderTarget(rect.Width, rect.Height, renderTarget.SampleCount, renderTarget.StencilBits, renderTarget.GetGlFramebufferInfo());
// create the surface
using (var surface = SKSurface.Create(grContext, renderTarget, SKColorType.Rgba8888))
{
if (PaintSurface != null)
{
PaintSurface.Invoke(surface);
}
surface.Canvas.Flush();
}
}
}
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
grContext = GRContext.Create(GRBackend.OpenGL, glInterface);
// get initial details
renderTarget = CreateRenderTarget();
}
// update to the latest dimensions
renderTarget = new GRBackendRenderTarget(Width, Height, renderTarget.SampleCount, renderTarget.StencilBits, renderTarget.GetGlFramebufferInfo());
// create the surface
using (var surface = SKSurface.Create(grContext, renderTarget, SKColorType.Rgba8888))
{
if (PaintSurface != null)
{
PaintSurface.Invoke(surface);
}
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget));
surface.Canvas.Flush();
}
// update the control
SwapBuffers();
}