// Copyright (C) 2009-present, Panagiotis Christopoulos Charitos and contributors.
// All rights reserved.
// Code licensed under the BSD License.
// http://www.anki3d.org/LICENSE

#pragma once

#include <AnKi/Renderer/RendererObject.h>

namespace anki {

/// @addtogroup renderer
/// @{

/// Compute the history length (aka disocclusion length)
class HistoryLength : public RendererObject
{
public:
	HistoryLength()
	{
		registerDebugRenderTarget("HistoryLen");
	}

	Error init();

	void populateRenderGraph(RenderingContext& ctx);

	void getDebugRenderTarget([[maybe_unused]] CString rtName, Array<RenderTargetHandle, U32(DebugRenderTargetRegister::kCount)>& handles,
							  [[maybe_unused]] DebugRenderTargetDrawStyle& drawStyle) const override
	{
		handles[0] = m_runCtx.m_rt;
		drawStyle = DebugRenderTargetDrawStyle::kRedOnly;
	}

	RenderTargetHandle getRt() const
	{
		return m_runCtx.m_rt;
	}

private:
	ShaderProgramResourcePtr m_prog;
	ShaderProgramPtr m_grProg;

	Array<TexturePtr, 2> m_historyLenTextures;
	Bool m_texturesImportedOnce = false;

	class
	{
	public:
		RenderTargetHandle m_rt;
	} m_runCtx;
};
/// @}

} // namespace anki