private void Draw()
{
// begin the offscreen render pass
var offscreenPassAction = PassAction.Clear(Rgba32F.Black);
_offscreenRenderPass.Begin(ref offscreenPassAction);
// describe the bindings for rendering a non-textured cube into the render target
var offscreenResourceBindings = default(ResourceBindings);
offscreenResourceBindings.VertexBuffer() = _vertexBuffer;
offscreenResourceBindings.IndexBuffer = _indexBuffer;
// apply the render pipeline and bindings for the offscreen render pass
_offscreenRenderPass.ApplyPipeline(_offscreenPipeline);
_offscreenRenderPass.ApplyBindings(ref offscreenResourceBindings);
// apply the mvp matrix to the offscreen vertex shader
_offscreenRenderPass.ApplyShaderUniforms(ShaderStageType.VertexStage, ref _modelViewProjectionMatrix);
// draw the non-textured cube into the target of the offscreen render pass
_offscreenRenderPass.DrawElements(36);
// end the offscreen render pass
_offscreenRenderPass.End();
// begin a frame buffer render pass
Rgba32F clearColor = 0x0040FFFF;
var frameBufferPass = BeginDefaultPass(clearColor);
// describe the bindings for using the offscreen render target as the sampled texture
var frameBufferResourceBindings = default(ResourceBindings);
frameBufferResourceBindings.VertexBuffer() = _vertexBuffer;
frameBufferResourceBindings.IndexBuffer = _indexBuffer;
frameBufferResourceBindings.FragmentStageImage() = _renderTarget;
// apply the render pipeline and bindings for the frame buffer render pass
frameBufferPass.ApplyPipeline(_frameBufferPipeline);
frameBufferPass.ApplyBindings(ref frameBufferResourceBindings);
// apply the mvp matrix to the frame buffer vertex shader
frameBufferPass.ApplyShaderUniforms(ShaderStageType.VertexStage, ref _modelViewProjectionMatrix);
// draw the textured cube into the target of the frame buffer render pass
frameBufferPass.DrawElements(36);
// end the frame buffer render pass
frameBufferPass.End();
}
/// <summary>
/// Begins and returns the frame buffer <see cref="Pass" /> with the specified width, height, and
/// <see cref="PassAction.Clear" /> as the action.
/// </summary>
/// <param name="clearColor">The color to clear the color attachments.</param>
/// <returns>The frame buffer <see cref="Pass" />.</returns>
public static Pass BeginDefaultPass(Rgba32F clearColor)
{
var passAction = PassAction.Clear(clearColor);
return(BeginDefaultPass(ref passAction));
}