The SRP Context

SRP renders using the concept of delayed execution. You build up a list of commands and then execute them. The object that you use to build up these commands is called the ScriptableRenderContext and is passed as an argument to the Render function.

When you populate the SRP Context with operations, you can then call Submit to submit all the queued up rendering calls, which are generally a combination of CommandBuffer executions as well as SRP specific draw commands.

An example of this is using a CommandBuffer to clear a render target.

public class BasicPipeInstance : RenderPipeline
{
    private Color m_ClearColor = Color.black;

    public BasicPipeInstance(Color clearColor)
    {
        m_ClearColor = clearColor;
    }

    public override void Render(ScriptableRenderContext context, Camera[] cameras)
    {
        // does not so much yet :(
        base.Render(context, cameras);

        // clear buffers to the configured color
        var cmd = new CommandBuffer();
        cmd.ClearRenderTarget(true, true, m_ClearColor);
        context.ExecuteCommandBuffer(cmd);
        cmd.Release();
        context.Submit();
    }
}

For more information about the Scriptable Render Context, see the API documentation.