/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2017 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once
#include "core.h"
#include "pipeline.h"

/**
 * Implements a pipeline step that renders the 3D scene
 */
class Draw3D : public RenderStep
{
public:
	virtual void setRenderSource(RenderSource *) override {}
	virtual void setRenderTarget(RenderTarget *target) override { m_target = target; }

	virtual void reset(PipelineContext &context) override {}
	virtual void run(PipelineContext &context) override;

private:
	RenderTarget *m_target {nullptr};
};

/**
 * Implements a pipeline step that renders the game HUD
 */
class DrawHUD : public RenderStep
{
public:
	virtual void setRenderSource(RenderSource *) override {}
	virtual void setRenderTarget(RenderTarget *) override {}

	virtual void reset(PipelineContext &context) override {}
	virtual void run(PipelineContext &context) override;
};

class MapPostFxStep : public TrivialRenderStep
{
public:
	virtual void setRenderTarget(RenderTarget *) override;
	virtual void run(PipelineContext &context) override;
private:
	RenderTarget *target;
};

class RenderShadowMapStep : public TrivialRenderStep
{
public:
	virtual void run(PipelineContext &context) override;
};

/**
 * UpscaleStep step performs rescaling of the image 
 * in the source texture 0 to the size of the target.
 */
class UpscaleStep : public RenderStep
{
public:

    virtual void setRenderSource(RenderSource *source) override { m_source = source; }
    virtual void setRenderTarget(RenderTarget *target) override { m_target = target; }
    virtual void reset(PipelineContext &context) override {};
    virtual void run(PipelineContext &context) override;
private:
	RenderSource *m_source;
	RenderTarget *m_target;
};

std::unique_ptr<RenderStep> create3DStage(Client *client, v2f scale);
RenderStep* addUpscaling(RenderPipeline *pipeline, RenderStep *previousStep, v2f downscale_factor);

void populatePlainPipeline(RenderPipeline *pipeline, Client *client);