/// <summary>
/// Renders the post processing stage and all linked stages.
/// </summary>
/// <returns>TargetTexture of the last linked post processing stage.</returns>
public Texture2D Render(Texture2D sourceTexture)
{
OpenGL.ValidateThread();
GL.Disable(EnableCap.Blend);
GL.Disable(EnableCap.DepthTest);
GL.Disable(EnableCap.CullFace);
var stage = this;
stage.SourceTexture = sourceTexture;
FrameBuffer renderTarget = FrameBuffer.Current;
this.tools.Value.vao.Bind();
Viewport.Push();
while (stage != null)
{
if (stage.Effect == null)
{
throw new InvalidOperationException("One or more post processing stages are missing a shader.");
}
if (stage.TargetTexture == null)
{
throw new InvalidOperationException("One or more post processing stages are missing a target texture.");
}
Viewport.Area = new Box2i(0, 0, stage.TargetTexture.Width, stage.TargetTexture.Height);
this.tools.Value.frameBuffer.SetTextures(stage.TargetTexture);
this.tools.Value.frameBuffer.Bind();
stage.Effect.InvertY = true;
var cs = stage.Effect.Select();
cs.Bind();
cs.BindUniform(stage);
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
if (stage.Stage == null)
{
break;
}
else
{
stage.Stage.SourceTexture = stage.TargetTexture;
stage = stage.Stage;
}
}
;
Viewport.Pop();
VertexArray.Unbind();
FrameBuffer.Current = renderTarget;
return(stage.TargetTexture);
}
/// <summary>
/// Pops a viewport from the stack and makes it current.
/// </summary>
public static void Pop()
{
OpenGL.ValidateThread();
if (current.Value.stack.Count > 0)
{
Viewport.Area = current.Value.stack.Pop();
}
else
{
Viewport.Area = GetDefault();
}
}
/// <summary>
/// Pushes the current viewport settings on the stack.
/// </summary>
public static void Push()
{
OpenGL.ValidateThread();
current.Value.stack.Push(current.Value.viewport);
}