/*
**  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.reset(new RenderMemory());
		Viewport.reset(new RenderViewport());
		Light.reset(new LightVisibility());
		DrawQueue.reset(new DrawerCommandQueue(FrameMemory.get()));
		OpaquePass.reset(new RenderOpaquePass(this));
		TranslucentPass.reset(new RenderTranslucentPass(this));
		SpriteList.reset(new VisibleSpriteList());
		Portal.reset(new RenderPortal(this));
		Clip3D.reset(new Clip3DFloors(this));
		PlayerSprites.reset(new RenderPlayerSprites(this));
		PlaneList.reset(new VisiblePlaneList(this));
		DrawSegments.reset(new DrawSegmentList(this));
		ClipSegments.reset(new RenderClipSegment());
		tc_drawers.reset(new SWTruecolorDrawers(DrawQueue));
		pal_drawers.reset(new 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, FRenderStyle style)
	{
		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;

		std::unique_lock<std::mutex> lock(loadmutex);

		texture->GetPixels(style);
		const FTexture::Span *spans;
		texture->GetColumn(style, 0, &spans);
		if (Viewport->RenderTarget->IsBgra())
		{
			texture->GetPixelsBgra();
			texture->GetColumnBgra(0, &spans);
		}
	}

	void RenderThread::PreparePolyObject(subsector_t *sub)
	{
		static std::mutex polyobjmutex;

		std::unique_lock<std::mutex> lock(polyobjmutex);

		if (sub->BSP == nullptr || sub->BSP->bDirty)
		{
			sub->BuildPolyBSP();
		}
	}
}