/// <inheritdoc/>
public void SetScissorRectangle(Rectangle? rect)
{
Contract.EnsureNotDisposed(this, Disposed);
if (this.scissorRectangle != rect)
{
if (rect == null)
{
gl.Disable(gl.GL_SCISSOR_TEST);
gl.ThrowIfError();
}
else
{
var rectValue = rect.GetValueOrDefault();
if (rectValue.Width < 0 || rectValue.Height < 0)
throw new ArgumentOutOfRangeException("rect");
var x = rectValue.X;
var y = rectValue.Y;
ConvertScreenRegionUvToGL(ref x, ref y, rectValue.Width, rectValue.Height);
gl.Enable(gl.GL_SCISSOR_TEST);
gl.ThrowIfError();
gl.Scissor(x, y, rectValue.Width, rectValue.Height);
gl.ThrowIfError();
}
this.scissorRectangle = rect;
}
}
