public void Begin(ISpriteShaderProgram shader)
{
if (shader == null)
throw new ArgumentNullException("shader");
if (this.drawInProgress)
throw new InvalidOperationException("Draw already in progress.");
this.shader = shader;
this.graphics.BlendEnabled = true;
this.graphics.SourceBlendFactor = SourceBlendFactor.SourceAlpha;
this.graphics.DestinationBlendFactor = DestinationBlendFactor.OneMinusSourceAlpha;
this.graphics.DepthBufferEnabled = true;
this.graphics.DepthFunction = DepthFunction.LessThanOrEqual;
this.drawInProgress = true;
}
public void End()
{
this.EnsureDrawInProgress();
this.Flush();
this.shader = null;
this.drawInProgress = false;
}
