/*
**  Renderer multithreading framework
**  Copyright (c) 2016 Magnus Norddahl
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
*/

#include <stdlib.h>
#include "templates.h"
#include "doomdef.h"
#include "m_bbox.h"
#include "i_system.h"
#include "p_lnspec.h"
#include "p_setup.h"
#include "a_sharedglobal.h"
#include "g_level.h"
#include "p_effect.h"
#include "doomstat.h"
#include "r_state.h"
#include "v_palette.h"
#include "r_sky.h"
#include "po_man.h"
#include "r_data/colormaps.h"
#include "r_renderthread.h"
#include "swrenderer/things/r_visiblespritelist.h"
#include "swrenderer/scene/r_portal.h"
#include "swrenderer/scene/r_opaque_pass.h"
#include "swrenderer/scene/r_translucent_pass.h"
#include "swrenderer/scene/r_3dfloors.h"
#include "swrenderer/scene/r_scene.h"
#include "swrenderer/things/r_playersprite.h"
#include "swrenderer/plane/r_visibleplanelist.h"
#include "swrenderer/segments/r_drawsegment.h"
#include "swrenderer/segments/r_clipsegment.h"
#include "swrenderer/drawers/r_thread.h"
#include "swrenderer/drawers/r_draw.h"
#include "swrenderer/drawers/r_draw_rgba.h"
#include "swrenderer/drawers/r_draw_pal.h"
#include "swrenderer/viewport/r_viewport.h"
#include "r_memory.h"

namespace swrenderer
{
	RenderThread::RenderThread(RenderScene *scene, bool mainThread)
	{
		Scene = scene;
		MainThread = mainThread;
		FrameMemory = std::make_unique<RenderMemory>();
		Viewport = std::make_unique<RenderViewport>();
		Light = std::make_unique<LightVisibility>();
		DrawQueue = std::make_shared<DrawerCommandQueue>(FrameMemory.get());
		OpaquePass = std::make_unique<RenderOpaquePass>(this);
		TranslucentPass = std::make_unique<RenderTranslucentPass>(this);
		SpriteList = std::make_unique<VisibleSpriteList>();
		Portal = std::make_unique<RenderPortal>(this);
		Clip3D = std::make_unique<Clip3DFloors>(this);
		PlayerSprites = std::make_unique<RenderPlayerSprites>(this);
		PlaneList = std::make_unique<VisiblePlaneList>(this);
		DrawSegments = std::make_unique<DrawSegmentList>(this);
		ClipSegments = std::make_unique<RenderClipSegment>();
		tc_drawers = std::make_unique<SWTruecolorDrawers>(DrawQueue);
		pal_drawers = std::make_unique<SWPalDrawers>(DrawQueue);
	}

	RenderThread::~RenderThread()
	{
	}
	
	SWPixelFormatDrawers *RenderThread::Drawers(RenderViewport *viewport)
	{
		if (viewport->RenderTarget->IsBgra())
			return tc_drawers.get();
		else
			return pal_drawers.get();
	}

	void RenderThread::PrepareTexture(FTexture *texture)
	{
		if (texture == nullptr)
			return;

		// Textures may not have loaded/refreshed yet. The shared code doing
		// this is not thread safe. By calling GetPixels in a mutex lock we
		// make sure that only one thread is loading a texture at any given
		// time.
		//
		// It is critical that this function is called before any direct
		// calls to GetPixels for this to work.

		static std::mutex loadmutex;
		loadmutex.lock();
		try
		{
			texture->GetPixels();
			const FTexture::Span *spans;
			texture->GetColumn(0, &spans);
			if (Viewport->RenderTarget->IsBgra())
			{
				texture->GetPixelsBgra();
				texture->GetColumnBgra(0, &spans);
			}
			loadmutex.unlock();
		}
		catch (...)
		{
			loadmutex.unlock();
			throw;
		}
	}
}