using XCEngine;
using XCEngine.Rendering;

namespace XCEngine.Rendering.Renderer
{
    public abstract class RendererBackedRenderPipeline
        : ScriptableRenderPipeline
    {
        private ScriptableRenderer m_renderer;

        protected RendererBackedRenderPipeline()
        {
        }

        protected internal virtual ScriptableRenderer CreateRenderer()
        {
            return null;
        }

        protected override bool SupportsStageRenderGraph(
            CameraFrameStage stage)
        {
            ScriptableRenderer renderer = GetOrCreateRenderer();
            return renderer != null &&
                   renderer.SupportsStageRenderGraph(stage);
        }

        protected override bool RecordStageRenderGraph(
            ScriptableRenderContext context)
        {
            ScriptableRenderer renderer = GetOrCreateRenderer();
            return renderer != null &&
                   renderer.RecordStageRenderGraph(context);
        }

        protected ScriptableRenderer renderer =>
            GetOrCreateRenderer();

        private ScriptableRenderer GetOrCreateRenderer()
        {
            if (m_renderer == null)
            {
                m_renderer = CreateRenderer();
            }

            return m_renderer;
        }
    }
}