/*
**	Command & Conquer Renegade(tm)
**	Copyright 2025 Electronic Arts Inc.
**
**	This program is free software: you can redistribute it and/or modify
**	it under the terms of the GNU General Public License as published by
**	the Free Software Foundation, either version 3 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 General Public License for more details.
**
**	You should have received a copy of the GNU General Public License
**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "textureloader.h"
#include "mutex.h"
#include "thread.h"
#include "wwdebug.h"
#include "texture.h"
#include "ffactory.h"
#include "wwstring.h"
#include	"bufffile.h"
#include "ww3d.h"
#include "texfcach.h"
#include "assetmgr.h"
#include "dx8wrapper.h"
#include "dx8caps.h"
#include "missingtexture.h"
#include "targa.h"
#include <D3dx8tex.h>
#include <cstdio>
#include "wwmemlog.h"
#include "texture.h"
#include "formconv.h"
#include "texturethumbnail.h"
#include "ddsfile.h"
#include "bitmaphandler.h"

bool TextureLoader::TextureLoadSuspended;

#define USE_MANAGED_TEXTURES

////////////////////////////////////////////////////////////////////////////////
// 
// TextureLoadTaskListClass implementation
// 
////////////////////////////////////////////////////////////////////////////////

TextureLoadTaskListClass::TextureLoadTaskListClass(void)
: Root()
{
	Root.Next = Root.Prev = &Root;
}

void TextureLoadTaskListClass::Push_Front	(TextureLoadTaskClass *task)
{
	// task should non-null and not on any list
	WWASSERT(task != NULL && task->Next == NULL && task->Prev == NULL);

	// update inserted task to point to list
	task->Next			= Root.Next;
	task->Prev			= &Root;
	task->List			= this;

	// update list to point to inserted task
	Root.Next->Prev	= task;
	Root.Next			= task;
}

void TextureLoadTaskListClass::Push_Back(TextureLoadTaskClass *task)
{
	// task should be non-null and not on any list
	WWASSERT(task != NULL && task->Next == NULL && task->Prev == NULL);

	// update inserted task to point to list
	task->Next			= &Root;
	task->Prev			= Root.Prev;
	task->List			= this;

	// update list to point to inserted task
	Root.Prev->Next	= task;
	Root.Prev			= task;
}

TextureLoadTaskClass *TextureLoadTaskListClass::Pop_Front(void)
{
	// exit early if list is empty
	if (Is_Empty()) {
		return 0;
	}

	// otherwise, grab first task and remove it.
	TextureLoadTaskClass *task = (TextureLoadTaskClass *)Root.Next;
	Remove(task);
	return task;

}

TextureLoadTaskClass *TextureLoadTaskListClass::Pop_Back(void)
{
	// exit early if list is empty
	if (Is_Empty()) { 
		return 0;
	}

	// otherwise, grab last task and remove it.
	TextureLoadTaskClass *task = (TextureLoadTaskClass *)Root.Prev;
	Remove(task);
	return task;
}

void TextureLoadTaskListClass::Remove(TextureLoadTaskClass *task)
{
	// exit early if task is not on this list.
	if (task->List != this) {
		return;
	}

	// update list to skip task
	task->Prev->Next = task->Next;
	task->Next->Prev = task->Prev;

	// update task to no longer point at list
	task->Prev	= 0;
	task->Next	= 0;
	task->List	= 0;
}


////////////////////////////////////////////////////////////////////////////////
// 
// SynchronizedTextureLoadTaskListClass implementation
// 
////////////////////////////////////////////////////////////////////////////////

SynchronizedTextureLoadTaskListClass::SynchronizedTextureLoadTaskListClass(void)
:	TextureLoadTaskListClass(),
	CriticalSection()
{
}

void SynchronizedTextureLoadTaskListClass::Push_Front(TextureLoadTaskClass *task)
{
	FastCriticalSectionClass::LockClass lock(CriticalSection);
	TextureLoadTaskListClass::Push_Front(task);
}

void SynchronizedTextureLoadTaskListClass::Push_Back(TextureLoadTaskClass *task)
{
	FastCriticalSectionClass::LockClass lock(CriticalSection);
	TextureLoadTaskListClass::Push_Back(task);
}

TextureLoadTaskClass *SynchronizedTextureLoadTaskListClass::Pop_Front(void)
{
	// this duplicates code inside base class, but saves us an unnecessary lock.
	if (Is_Empty()) {
		return 0;
	}

	FastCriticalSectionClass::LockClass lock(CriticalSection);
	return TextureLoadTaskListClass::Pop_Front();

}

TextureLoadTaskClass *SynchronizedTextureLoadTaskListClass::Pop_Back(void)
{
	// this duplicates code inside base class, but saves us an unnecessary lock.
	if (Is_Empty()) {
		return 0;
	}

	FastCriticalSectionClass::LockClass lock(CriticalSection);
	return TextureLoadTaskListClass::Pop_Back();
}

void SynchronizedTextureLoadTaskListClass::Remove(TextureLoadTaskClass *task)
{
	FastCriticalSectionClass::LockClass lock(CriticalSection);
	TextureLoadTaskListClass::Remove(task);
}


// Locks

// To prevent deadlock, threads should acquire locks in the order in which
// they are defined below. No ordering is necessary for the task list locks,
// since one thread can never hold two at once.

static FastCriticalSectionClass					_ForegroundCriticalSection;
static FastCriticalSectionClass					_BackgroundCriticalSection;

// Lists

static SynchronizedTextureLoadTaskListClass	_ForegroundQueue;
static SynchronizedTextureLoadTaskListClass	_BackgroundQueue;
static TextureLoadTaskListClass					_FreeList;


// The background texture loading thread.
static class LoaderThreadClass : public ThreadClass
{
public:
#ifdef Exception_Handler
	LoaderThreadClass(const char *thread_name = "Texture loader thread") : ThreadClass(thread_name, &Exception_Handler) {}
#else
	LoaderThreadClass(const char *thread_name = "Texture loader thread") : ThreadClass(thread_name) {}
#endif

	void Thread_Function();
} _TextureLoadThread;


// TODO: Legacy - remove this call!
IDirect3DTexture8* Load_Compressed_Texture(
	const StringClass& filename,
	unsigned reduction_factor,
	TextureClass::MipCountType mip_level_count,
	WW3DFormat dest_format)
{
	// If DDS file isn't available, use TGA file to convert to DDS.

	DDSFileClass dds_file(filename,reduction_factor);
	if (!dds_file.Is_Available()) return NULL;
	if (!dds_file.Load()) return NULL;

	unsigned width=dds_file.Get_Width(0);
	unsigned height=dds_file.Get_Height(0);
	unsigned mips=dds_file.Get_Mip_Level_Count();

	// If format isn't defined get the nearest valid texture format to the compressed file format
	// Note that the nearest valid format could be anything, even uncompressed.
	if (dest_format==WW3D_FORMAT_UNKNOWN) dest_format=Get_Valid_Texture_Format(dds_file.Get_Format(),true);

	IDirect3DTexture8* d3d_texture = DX8Wrapper::_Create_DX8_Texture(
		width,
		height,
		dest_format,
		(TextureClass::MipCountType)mips);

	for (unsigned level=0;level<mips;++level) {
		IDirect3DSurface8* d3d_surface=NULL;
		WWASSERT(d3d_texture);
		DX8_ErrorCode(d3d_texture->GetSurfaceLevel(level/*-reduction_factor*/,&d3d_surface));
		dds_file.Copy_Level_To_Surface(level,d3d_surface);
		d3d_surface->Release();
	}
	return d3d_texture;
}

static bool Is_Format_Compressed(WW3DFormat texture_format,bool allow_compression)
{
	// Verify that the user isn't requesting compressed texture without hardware support

	bool compressed=false;
	if (texture_format!=WW3D_FORMAT_UNKNOWN) {
		if (!DX8Wrapper::Get_Current_Caps()->Support_DXTC() || !allow_compression) {
			WWASSERT(texture_format!=WW3D_FORMAT_DXT1);
			WWASSERT(texture_format!=WW3D_FORMAT_DXT2);
			WWASSERT(texture_format!=WW3D_FORMAT_DXT3);
			WWASSERT(texture_format!=WW3D_FORMAT_DXT4);
			WWASSERT(texture_format!=WW3D_FORMAT_DXT5);
		}
		if (texture_format==WW3D_FORMAT_DXT1 ||
			texture_format==WW3D_FORMAT_DXT2 ||
			texture_format==WW3D_FORMAT_DXT3 ||
			texture_format==WW3D_FORMAT_DXT4 ||
			texture_format==WW3D_FORMAT_DXT5) {
			compressed=true;
		}
	}

	// If hardware supports DXTC compression, load a compressed texture. Proceed only if the texture format hasn't been
	// defined as non-compressed.
	compressed|=(
		texture_format==WW3D_FORMAT_UNKNOWN &&
		DX8Wrapper::Get_Current_Caps()->Support_DXTC() &&
		allow_compression);

	return compressed;
}


////////////////////////////////////////////////////////////////////////////////
// 
// TextureLoader implementation
// 
////////////////////////////////////////////////////////////////////////////////

void TextureLoader::Init()
{
	WWASSERT(!_TextureLoadThread.Is_Running());

	ThumbnailManagerClass::Init();

	_TextureLoadThread.Execute();
	_TextureLoadThread.Set_Priority(-4);
}


void TextureLoader::Deinit()
{
	FastCriticalSectionClass::LockClass lock(_BackgroundCriticalSection);
	_TextureLoadThread.Stop();

	ThumbnailManagerClass::Deinit();
	TextureLoadTaskClass::Delete_Free_Pool();
}


bool TextureLoader::Is_DX8_Thread(void)
{
	return (ThreadClass::_Get_Current_Thread_ID() == DX8Wrapper::_Get_Main_Thread_ID());
}


// ----------------------------------------------------------------------------
//
// Modify given texture size to nearest valid size on current hardware.
//
// ----------------------------------------------------------------------------

void TextureLoader::Validate_Texture_Size(unsigned& width, unsigned& height)
{
	const D3DCAPS8& dx8caps=DX8Wrapper::Get_Current_Caps()->Get_DX8_Caps();

	unsigned poweroftwowidth = 1;
	while (poweroftwowidth < width) {
		poweroftwowidth <<= 1;
	}

	unsigned poweroftwoheight = 1;
	while (poweroftwoheight < height) {
		poweroftwoheight <<= 1;
	}

	if (poweroftwowidth>dx8caps.MaxTextureWidth) {
		poweroftwowidth=dx8caps.MaxTextureWidth;
	}
	if (poweroftwoheight>dx8caps.MaxTextureHeight) {
		poweroftwoheight=dx8caps.MaxTextureHeight;
	}

	if (poweroftwowidth>poweroftwoheight) {
		while (poweroftwowidth/poweroftwoheight>8) {
			poweroftwoheight*=2;
		}
	}
	else {
		while (poweroftwoheight/poweroftwowidth>8) {
			poweroftwowidth*=2;
		}
	}

	width=poweroftwowidth;
	height=poweroftwoheight;
}

IDirect3DTexture8* TextureLoader::Load_Thumbnail(const StringClass& filename)//,WW3DFormat texture_format)
{
	WWASSERT(Is_DX8_Thread());

	ThumbnailClass* thumb=NULL;
	ThumbnailManagerClass* thumb_man=ThumbnailManagerClass::Peek_List().Head();
	while (thumb_man) {
		thumb=thumb_man->Peek_Thumbnail_Instance(filename);
		if (thumb) break;
		thumb_man=thumb_man->Succ();
	}

	// If no thumb is found return a missing texture
	if (!thumb) {
		return MissingTexture::_Get_Missing_Texture();
	}

	WWASSERT(thumb->Get_Format()==WW3D_FORMAT_A4R4G4B4);
	unsigned src_pitch=thumb->Get_Width()*2;	// Thumbs are always 16 bits
	WW3DFormat dest_format;
	WW3DFormat texture_format=WW3D_FORMAT_UNKNOWN;
	if (texture_format==WW3D_FORMAT_UNKNOWN) {
		dest_format=Get_Valid_Texture_Format(WW3D_FORMAT_A4R4G4B4,false); // no compressed formats please
	}
	else {
		dest_format=Get_Valid_Texture_Format(texture_format,false);	// no compressed formats please
		WWASSERT(dest_format==texture_format);
	}

	IDirect3DTexture8* sysmem_texture = DX8Wrapper::_Create_DX8_Texture(
		thumb->Get_Width(),
		thumb->Get_Height(),
		dest_format,
		TextureClass::MIP_LEVELS_ALL,
#ifdef USE_MANAGED_TEXTURES
		D3DPOOL_MANAGED);
#else
		D3DPOOL_SYSTEMMEM);
#endif

	unsigned level=0;
	D3DLOCKED_RECT locked_rects[12];
	WWASSERT(sysmem_texture->GetLevelCount()<=12);

	// Lock all surfaces
	for (level=0;level<sysmem_texture->GetLevelCount();++level) {
		DX8_ErrorCode(
			sysmem_texture->LockRect(
				level,
				&locked_rects[level],
				NULL,
				0));
	}

	unsigned char* src_surface=thumb->Peek_Bitmap();
	WW3DFormat src_format=thumb->Get_Format();
	unsigned width=thumb->Get_Width();
	unsigned height=thumb->Get_Height();

	for (level=0;level<sysmem_texture->GetLevelCount()-1;++level) {
		BitmapHandlerClass::Copy_Image_Generate_Mipmap(
			width,
			height,
			(unsigned char*)locked_rects[level].pBits,
			locked_rects[level].Pitch,
			dest_format,
			src_surface,
			src_pitch,
			src_format,
			(unsigned char*)locked_rects[level+1].pBits,	// mipmap
			locked_rects[level+1].Pitch);// mipmap

		src_format=dest_format;
		src_surface=(unsigned char*)locked_rects[level].pBits;
		src_pitch=locked_rects[level].Pitch;
		width>>=1;
		height>>=1;
	}

	// Unlock all surfaces
	for (level=0;level<sysmem_texture->GetLevelCount();++level) {
		DX8_ErrorCode(sysmem_texture->UnlockRect(level));
	}
#ifdef USE_MANAGED_TEXTURES
	return sysmem_texture;
#else
	IDirect3DTexture8* d3d_texture = DX8Wrapper::_Create_DX8_Texture(
		thumb->Get_Width(),
		thumb->Get_Height(),
		dest_format,
		TextureClass::MIP_LEVELS_ALL,
		D3DPOOL_DEFAULT);
	DX8CALL(UpdateTexture(sysmem_texture,d3d_texture));
	sysmem_texture->Release();

	WWDEBUG_SAY(("Created non-managed texture (%s)\n",filename));
	return d3d_texture;
#endif
}


// ----------------------------------------------------------------------------
//
// Load image to a surface. The function tries to create texture that matches
// targa format. If suitable format is not available, it selects closest matching
// format and performs color space conversion.
//
// ----------------------------------------------------------------------------
IDirect3DSurface8* TextureLoader::Load_Surface_Immediate(
	const StringClass& filename,
	WW3DFormat texture_format,
	bool allow_compression)
{
	WWASSERT(Is_DX8_Thread());

	bool compressed=Is_Format_Compressed(texture_format,allow_compression);

	if (compressed) {
		IDirect3DTexture8* comp_tex=Load_Compressed_Texture(filename,0,TextureClass::MIP_LEVELS_1,WW3D_FORMAT_UNKNOWN);
		if (comp_tex) {
			IDirect3DSurface8* d3d_surface=NULL;
			DX8_ErrorCode(comp_tex->GetSurfaceLevel(0,&d3d_surface));
			comp_tex->Release();
			return d3d_surface;
		}
	}

	// Make sure the file can be opened. If not, return missing texture.
	Targa targa;
	if (TARGA_ERROR_HANDLER(targa.Open(filename, TGA_READMODE),filename)) return MissingTexture::_Create_Missing_Surface();

	// DX8 uses image upside down compared to TGA
	targa.Header.ImageDescriptor ^= TGAIDF_YORIGIN;

	WW3DFormat src_format,dest_format;
	unsigned src_bpp=0;
	Get_WW3D_Format(dest_format,src_format,src_bpp,targa);

	if (texture_format!=WW3D_FORMAT_UNKNOWN) {
		dest_format=texture_format;
	}

	// Destination size will be the next power of two square from the larger width and height...
	unsigned width, height;
	width=targa.Header.Width;
	height=targa.Header.Height;
	unsigned src_width=targa.Header.Width;
	unsigned src_height=targa.Header.Height;

	// NOTE: We load the palette but we do not yet support paletted textures!
	char palette[256*4];
	targa.SetPalette(palette);
	if (TARGA_ERROR_HANDLER(targa.Load(filename, TGAF_IMAGE, false),filename)) return MissingTexture::_Create_Missing_Surface();

	unsigned char* src_surface=(unsigned char*)targa.GetImage();

	// No paletted destination format allowed
	unsigned char* converted_surface=NULL;
	if (src_format==WW3D_FORMAT_A1R5G5B5 || src_format==WW3D_FORMAT_R5G6B5 || src_format==WW3D_FORMAT_A4R4G4B4 ||
		src_format==WW3D_FORMAT_P8 || src_format==WW3D_FORMAT_L8 || src_width!=width || src_height!=height) {
		converted_surface=new unsigned char[width*height*4];
		dest_format=Get_Valid_Texture_Format(WW3D_FORMAT_A8R8G8B8,false);
		BitmapHandlerClass::Copy_Image(
			converted_surface,
			width,
			height,
			width*4,
			WW3D_FORMAT_A8R8G8B8,//dest_format,
			src_surface,
			src_width,
			src_height,
			src_width*src_bpp,
			src_format,
			(unsigned char*)targa.GetPalette(),
			targa.Header.CMapDepth>>3,
			false);
		src_surface=converted_surface;
		src_format=WW3D_FORMAT_A8R8G8B8;//dest_format;
		src_width=width;
		src_height=height;
		src_bpp=Get_Bytes_Per_Pixel(src_format);
	}

	unsigned src_pitch=src_width*src_bpp;

	IDirect3DSurface8* d3d_surface = DX8Wrapper::_Create_DX8_Surface(width,height,dest_format);
	WWASSERT(d3d_surface);
	D3DLOCKED_RECT locked_rect;
	DX8_ErrorCode(
		d3d_surface->LockRect(
			&locked_rect,
			NULL,
			0));

	BitmapHandlerClass::Copy_Image(
		(unsigned char*)locked_rect.pBits,
		width,
		height,
		locked_rect.Pitch,
		dest_format,
		src_surface,
		src_width,
		src_height,
		src_pitch,
		src_format,
		(unsigned char*)targa.GetPalette(),
		targa.Header.CMapDepth>>3,
		false);	// No mipmap

	DX8_ErrorCode(d3d_surface->UnlockRect());

	if (converted_surface) delete[] converted_surface;

	return d3d_surface;
}


void TextureLoader::Request_Thumbnail(TextureClass *tc)
{
	// Grab the foreground lock. This prevents the foreground thread
	// from retiring any tasks related to this texture. It also
	// serializes calls to Request_Thumbnail from multiple threads.
	FastCriticalSectionClass::LockClass lock(_ForegroundCriticalSection);

	// Has a Direct3D texture already been loaded?
	if (tc->Peek_DX8_Texture()) {
		return;
	}

	TextureLoadTaskClass *task = tc->ThumbnailLoadTask;

	if (Is_DX8_Thread()) {
		// load the thumbnail immediately
		TextureLoader::Load_Thumbnail(tc);

		// clear any pending thumbnail load
		if (task) {
			_ForegroundQueue.Remove(task);
			task->Destroy();
		}

	} else {
		TextureLoadTaskClass *load_task = tc->TextureLoadTask;

		// if texture is not already loading a thumbnail and there is no
		// background load near completion. (a background load waiting
		// to be applied will be ready at the same time as a queued thumbnail.
		// Why do the extra work?)
		if (!task && (!load_task || load_task->Get_State() < TextureLoadTaskClass::STATE_LOAD_MIPMAP)) {

			// create a thumbnail load task and add to foreground queue.
			task = TextureLoadTaskClass::Create(tc, TextureLoadTaskClass::TASK_THUMBNAIL, TextureLoadTaskClass::PRIORITY_LOW);
			_ForegroundQueue.Push_Back(task);
		}
	}
}


void TextureLoader::Request_Background_Loading(TextureClass *tc)
{
	// Grab the foreground lock. This prevents the foreground thread
	// from retiring any tasks related to this texture. It also 
	// serializes calls to Request_Background_Loading from other
	// threads.
	FastCriticalSectionClass::LockClass foreground_lock(_ForegroundCriticalSection);

	// Has the texture already been loaded?
	if (tc->Is_Initialized()) {
		return;
	}

	TextureLoadTaskClass *task = tc->TextureLoadTask;

	// if texture already has a load task, we don't need to create another one.
	if (task) {
		return;
	}

	task = TextureLoadTaskClass::Create(tc, TextureLoadTaskClass::TASK_LOAD, TextureLoadTaskClass::PRIORITY_LOW);

	if (Is_DX8_Thread()) {
		Begin_Load_And_Queue(task);
	} else {
		_ForegroundQueue.Push_Back(task);
	}
}


void TextureLoader::Request_Foreground_Loading(TextureClass *tc)
{
	// Grab the foreground lock. This prevents the foreground thread
	// from retiring the load tasks for this texture. It also 
	// serializes calls to Request_Foreground_Loading from other
	// threads.
	FastCriticalSectionClass::LockClass foreground_lock(_ForegroundCriticalSection);

	// Has the texture already been loaded?
	if (tc->Is_Initialized()) {
		return;
	}

	TextureLoadTaskClass *task			= tc->TextureLoadTask;
	TextureLoadTaskClass *task_thumb = tc->ThumbnailLoadTask;

	if (Is_DX8_Thread()) {

		// since we're in the DX8 thread, we can load the entire
		// texture right now.

		// if we have a thumbnail task waiting, kill it.
		if (task_thumb) {
			_ForegroundQueue.Remove(task_thumb);
			task_thumb->Destroy();
		}

		if (task) {
			// we need to remove the task from any queue, since we're going
			// to finish it up right now.

			// halt background thread. After we're holding this lock,
			// we know the background thread cannot begin loading
			// mipmap levels for this texture.
			FastCriticalSectionClass::LockClass background_lock(_BackgroundCriticalSection);
			_ForegroundQueue.Remove(task);
			_BackgroundQueue.Remove(task);
		} else {
			// Since the task manages all the state associated with loading
			// a texture, we temporarily create one.
			task = TextureLoadTaskClass::Create(tc, TextureLoadTaskClass::TASK_LOAD, TextureLoadTaskClass::PRIORITY_HIGH);
		}

		// finish loading the task and destroy it.
		task->Finish_Load();
		task->Destroy();

	} else {
		// we are not in the DX8 thread. We need to add a high-priority loading
		// task to the foreground queue.

		// Grab the background lock. After we're holding this lock, we
		// know the background thread cannot begin loading mipmap levels 
		// for this texture.
		FastCriticalSectionClass::LockClass background_lock(_BackgroundCriticalSection);

		// if we have a thumbnail task, we should cancel it. Since we are not
		// the foreground thread, we are not allowed to call Destroy(). Instead,
		// leave it queued in the completed state so it will be destroyed by Update().
		if (task_thumb) {
			task_thumb->Set_State(TextureLoadTaskClass::STATE_COMPLETE);
		}

		if (task) {
			// if a load task is waiting on the background queue, we need to 
			// move it to the foreground queue.
			if (task->Get_List() == &_BackgroundQueue) {

				// remove task from list
				_BackgroundQueue.Remove(task);

				// add to foreground queue.
				_ForegroundQueue.Push_Back(task);
			}

			// upgrade the task priority
			task->Set_Priority(TextureLoadTaskClass::PRIORITY_HIGH);

		} else {
			// allocate high priority load task
			task = TextureLoadTaskClass::Create(tc, TextureLoadTaskClass::TASK_LOAD, TextureLoadTaskClass::PRIORITY_HIGH);

			// add to back of foreground queue.
			_ForegroundQueue.Push_Back(task);
		}
	}
}


void TextureLoader::Flush_Pending_Load_Tasks(void)
{
	// This function can only be called from the main thread.
	// (Only the main thread can make the DX8 calls necessary
	// to complete texture loading. If we wanted to flush
	// the pending tasks from another thread, we'd probably
	// want to set a bool that is checked by Update().
	WWASSERT(Is_DX8_Thread());

	for (;;) {
		bool done = false;

		{
			// we have no pending load tasks when both queues are empty
			// and the background thread is not processing a texture.
			
			// Grab the background lock. Once we're holding it, we
			// know that the background thread is not processing any
			// textures.

			// NOTE: It's important that we do only hold on to the background
			// lock while we check for completion. Otherwise, we will either
			// violate the lock order when we call Update() (which grabs
			// the foreground lock) or never give the background thread
			// a chance to empty its queue.
			FastCriticalSectionClass::LockClass background_lock(_BackgroundCriticalSection);
			done = _BackgroundQueue.Is_Empty() && _ForegroundQueue.Is_Empty();
		}

		// exit loop if no entries in list
		if (done) {
			break;
		}

		Update();
		ThreadClass::Switch_Thread();
	}
}


// Nework update macro for texture loader.
#pragma warning(disable:4201) // warning C4201: nonstandard extension used : nameless struct/union
#include <mmsystem.h>
#define UPDATE_NETWORK 											\
	if (network_callback) {                            \
		unsigned long time2 = timeGetTime();            \
		if (time2 - time > 20) {                        \
			network_callback();                          \
			time = time2;                                \
		}                                               \
	}                                                  \


void TextureLoader::Update(void (*network_callback)(void))
{
	WWASSERT_PRINT(Is_DX8_Thread(), "TextureLoader::Update must be called from the main thread!");

	if (TextureLoadSuspended) {
		return;
	}

	// grab foreground lock to prevent any other thread from
	// modifying texture tasks.
	FastCriticalSectionClass::LockClass lock(_ForegroundCriticalSection);

	unsigned long time = timeGetTime();

	// while we have tasks on the foreground queue
	while (TextureLoadTaskClass *task = _ForegroundQueue.Pop_Front()) {
		UPDATE_NETWORK;
		// dispatch to proper task handler
		switch (task->Get_Type()) {
			case TextureLoadTaskClass::TASK_THUMBNAIL:
				Process_Foreground_Thumbnail(task);
				break;

			case TextureLoadTaskClass::TASK_LOAD:
				Process_Foreground_Load(task);
				break;
		}
	}

	TextureClass::Invalidate_Old_Unused_Textures(0);
}

void TextureLoader::Suspend_Texture_Load()
{
	WWASSERT_PRINT(Is_DX8_Thread(),"TextureLoader::Suspend_Texture_Load must be called from the main thread!");
	TextureLoadSuspended=true;
}

void TextureLoader::Continue_Texture_Load()
{
	WWASSERT_PRINT(Is_DX8_Thread(),"TextureLoader::Continue_Texture_Load must be called from the main thread!");
	TextureLoadSuspended=false;
}

void TextureLoader::Process_Foreground_Thumbnail(TextureLoadTaskClass *task)
{
	switch (task->Get_State()) {
		case TextureLoadTaskClass::STATE_NONE:
			Load_Thumbnail(task->Peek_Texture());
			// NOTE: fall-through is intentional

		case TextureLoadTaskClass::STATE_COMPLETE:
			task->Destroy();
			break;
	}
}


void TextureLoader::Process_Foreground_Load(TextureLoadTaskClass *task)
{
	// Is high-priority task?
	if (task->Get_Priority() == TextureLoadTaskClass::PRIORITY_HIGH) {
		task->Finish_Load();
		task->Destroy();
		return;
	}

	// otherwise, must be a low-priority task.

	switch (task->Get_State()) {
		case TextureLoadTaskClass::STATE_NONE:
			Begin_Load_And_Queue(task);
			break;

		case TextureLoadTaskClass::STATE_LOAD_MIPMAP:
			task->End_Load();
			task->Destroy();
			break;
	}
}


void TextureLoader::Begin_Load_And_Queue(TextureLoadTaskClass *task)
{
	// should only be called from the DX8 thread.
	WWASSERT(Is_DX8_Thread());

	if (task->Begin_Load()) {
		// add to front of background queue. This means the
		// background load thread will service tasks in LIFO
		// (last in, first out) order.

		// NOTE: this was how the old code did it, with a 
		// comment that mentioned good reasons for doing so,
		// without actually listing the reasons. I suspect 
		// it has something to do with visually important textures,
		// like those in the foreground, starting their load last.
		_BackgroundQueue.Push_Front(task);
	} else {
		// unable to load.
		task->Apply_Missing_Texture();
		task->Destroy();
	}
}


void TextureLoader::Load_Thumbnail(TextureClass *tc)
{
	// All D3D operations must run from main thread
	WWASSERT(Is_DX8_Thread());

	// load thumbnail texture
	IDirect3DTexture8 *d3d_texture = Load_Thumbnail(tc->Get_Full_Path());

	// apply thumbnail to texture
	tc->Apply_New_Surface(d3d_texture, false);

	// release our reference to thumbnail texture
	d3d_texture->Release();
	d3d_texture = 0;
}


void LoaderThreadClass::Thread_Function(void)
{
	while (running) {
		// if there are no tasks on the background queue, no need to grab background lock.
		if (!_BackgroundQueue.Is_Empty()) {
			// Grab background load so other threads know we could be 
			// loading a texture.
			FastCriticalSectionClass::LockClass lock(_BackgroundCriticalSection);

			// try to remove a task from the background queue. This could fail
			// if another thread modified the queue between our test above and
			// grabbing the lock.
			TextureLoadTaskClass* task = _BackgroundQueue.Pop_Front();
			if (task) {
				// verify task is in proper state for background processing.
				WWASSERT(task->Get_Type() == TextureLoadTaskClass::TASK_LOAD);
				WWASSERT(task->Get_State() == TextureLoadTaskClass::STATE_LOAD_BEGUN);

				// load mip map levels and return to foreground queue for final step.
				task->Load();
				_ForegroundQueue.Push_Back(task);
			}
		}

		Switch_Thread();
	}
}


////////////////////////////////////////////////////////////////////////////////
// 
// TextureLoaderTaskClass implementation
// 
////////////////////////////////////////////////////////////////////////////////

TextureLoadTaskClass::TextureLoadTaskClass()
:	Texture			(0),
	D3DTexture		(0),
	Format			(WW3D_FORMAT_UNKNOWN),
	Width				(0),
	Height			(0),
	MipLevelCount	(0),
	Reduction		(0),
	Type				(TASK_NONE),
	Priority			(PRIORITY_LOW),
	State				(STATE_NONE)
{
	// because texture load tasks are pooled, the constructor and destructor
	// don't need to do much. The work of attaching a task to a texture is
	// is done by Init() and Deinit().

	for (int i = 0; i < TextureClass::MIP_LEVELS_MAX; ++i) {
		LockedSurfacePtr[i]		= NULL;
		LockedSurfacePitch[i]	= 0;
	}
}


TextureLoadTaskClass::~TextureLoadTaskClass(void)
{
	Deinit();
}


TextureLoadTaskClass *TextureLoadTaskClass::Create(TextureClass *tc, TaskType type, PriorityType priority)
{
	// recycle or create a new texture load task with the given type 
	// and priority, then associate the texture with the task.

	// pull a load task from front of free list
	TextureLoadTaskClass *task = _FreeList.Pop_Front();

	// if no tasks on free list, allocate a new task
	if (!task) {
		task = new TextureLoadTaskClass;
	}

	task->Init(tc, type, priority);
	return task;
}


void TextureLoadTaskClass::Destroy(void)
{
	// detach the task from its texture, and return to free pool.
	Deinit();
	_FreeList.Push_Front(this);
}


void TextureLoadTaskClass::Delete_Free_Pool(void)
{
	// free memory for every task in the free pool.
	while (TextureLoadTaskClass *task = _FreeList.Pop_Front()) {
		delete task;
	}
}


void TextureLoadTaskClass::Init(TextureClass* tc, TaskType type, PriorityType priority)
{
	WWASSERT(tc);

	// NOTE: we must be in the main thread to avoid corrupting the texture's refcount.
	WWASSERT(TextureLoader::Is_DX8_Thread());
	REF_PTR_SET(Texture, tc);

	// Make sure texture has a filename.
	WWASSERT(Texture->Get_Full_Path() != "");

	Type				= type;
	Priority			= priority;
	State				= STATE_NONE;

	D3DTexture		= 0;

	Format			= Texture->Get_Texture_Format();
	Width				= 0;
	Height			= 0;
	MipLevelCount	= Texture->MipLevelCount;
	Reduction		= Texture->Get_Reduction();


	for (int i = 0; i < TextureClass::MIP_LEVELS_MAX; ++i) {
		LockedSurfacePtr[i]		= NULL;
		LockedSurfacePitch[i]	= 0;
	}

	switch (Type) {
		case TASK_THUMBNAIL:
			WWASSERT(Texture->ThumbnailLoadTask == NULL);
			Texture->ThumbnailLoadTask = this;
			break;

		case TASK_LOAD:
			WWASSERT(Texture->TextureLoadTask == NULL);
			Texture->TextureLoadTask = this;
			break;
	}
}


void TextureLoadTaskClass::Deinit()
{
	// task should not be on any list when it is being detached from texture.
	WWASSERT(Next == NULL);
	WWASSERT(Prev == NULL);

	WWASSERT(D3DTexture == NULL);

	for (int i = 0; i < TextureClass::MIP_LEVELS_MAX; ++i) {
		WWASSERT(LockedSurfacePtr[i] == NULL);
	}

	if (Texture) {
		switch (Type) {
			case TASK_THUMBNAIL:
				WWASSERT(Texture->ThumbnailLoadTask == this);
				Texture->ThumbnailLoadTask = NULL;
				break;

			case TASK_LOAD:
				WWASSERT(Texture->TextureLoadTask == this);
				Texture->TextureLoadTask = NULL;
				break;
		}

		// NOTE: we must be in main thread to avoid corrupting Texture's refcount.
		WWASSERT(TextureLoader::Is_DX8_Thread());
		REF_PTR_RELEASE(Texture);
	}
}


bool TextureLoadTaskClass::Begin_Load(void)
{
	WWASSERT(TextureLoader::Is_DX8_Thread());

	bool loaded = false;

	// if allowed, begin a compressed load
	if (Texture->Is_Compression_Allowed()) {
		loaded = Begin_Compressed_Load();
	}

	// otherwise, begin an uncompressed load
	if (!loaded) {
		loaded = Begin_Uncompressed_Load();
	}

	// if not loaded, abort.
	if (!loaded) {
		return false;
	}

	// lock surfaces in preparation for copy
	Lock_Surfaces();

	State = STATE_LOAD_BEGUN;

	return true;
}


// ----------------------------------------------------------------------------
//
// Load mipmap levels to a pre-generated and locked texture object based on
// information in load task object. Try loading from a DDS file first and if
// that fails try a TGA.
//
// ----------------------------------------------------------------------------
bool TextureLoadTaskClass::Load(void)
{
	WWMEMLOG(MEM_TEXTURE);
	WWASSERT(Peek_D3D_Texture());

	bool loaded = false;

	// if allowed, try to load compressed mipmaps
	if (Texture->Is_Compression_Allowed()) {
		loaded = Load_Compressed_Mipmap();
	}

	// otherwise, load uncompressed mipmaps
	if (!loaded) {
		loaded = Load_Uncompressed_Mipmap();
	}

	State = STATE_LOAD_MIPMAP;

	return loaded;
}


void TextureLoadTaskClass::End_Load(void)
{
	WWASSERT(TextureLoader::Is_DX8_Thread());

	Unlock_Surfaces();
	Apply(true);

	State = STATE_LOAD_COMPLETE;
}


void TextureLoadTaskClass::Finish_Load(void)
{
	switch (State) {
		// NOTE: fall-through below is intentional.

		case STATE_NONE:
			if (!Begin_Load()) {
				Apply_Missing_Texture();
				break;
			}

		case STATE_LOAD_BEGUN:
			Load();

		case STATE_LOAD_MIPMAP:
			End_Load();

		default:
			break;
	}
}


void TextureLoadTaskClass::Apply_Missing_Texture(void)
{
	WWASSERT(TextureLoader::Is_DX8_Thread());
	WWASSERT(!D3DTexture);

	D3DTexture = MissingTexture::_Get_Missing_Texture();
	Apply(true);
}


void TextureLoadTaskClass::Apply(bool initialize)
{
	WWASSERT(D3DTexture);

	// Verify that none of the mip levels are locked
	for (unsigned i=0;i<MipLevelCount;++i) {
		WWASSERT(LockedSurfacePtr[i]==NULL);
	}

	Texture->Apply_New_Surface(D3DTexture, initialize);

	D3DTexture->Release();
	D3DTexture = NULL;
}

static bool	Get_Texture_Information(
	const char* filename,
	unsigned reduction,
	unsigned& w,
	unsigned& h,
	WW3DFormat& format,
	unsigned& mip_count,
	bool compressed)
{
	ThumbnailClass* thumb=NULL;
	ThumbnailManagerClass* thumb_man=ThumbnailManagerClass::Peek_List().Head();
	while (thumb_man) {
		thumb=thumb_man->Peek_Thumbnail_Instance(filename);
		if (thumb) break;
		thumb_man=thumb_man->Succ();
	}
	if (!thumb) {
		if (compressed) {
			DDSFileClass dds_file(filename, reduction);
			if (!dds_file.Is_Available()) return false;

			// Destination size will be the next power of two square from the larger width and height...
			w = dds_file.Get_Width(0);
			h = dds_file.Get_Height(0);
			format = dds_file.Get_Format();
			mip_count = dds_file.Get_Mip_Level_Count();
			return true;
		}

		Targa targa;
		if (TARGA_ERROR_HANDLER(targa.Open(filename, TGA_READMODE), filename)) {
			return false;
		}

		unsigned int bpp;
		WW3DFormat dest_format;
		Get_WW3D_Format(dest_format,format,bpp,targa);

		// Destination size will be the next power of two square from the larger width and height...
		w = targa.Header.Width  >> reduction;
		h = targa.Header.Height >> reduction;
		mip_count = 0;
		return true; 
	}

	if (compressed &&
		thumb->Get_Original_Texture_Format()!=WW3D_FORMAT_DXT1 &&
		thumb->Get_Original_Texture_Format()!=WW3D_FORMAT_DXT2 &&
		thumb->Get_Original_Texture_Format()!=WW3D_FORMAT_DXT3 &&
		thumb->Get_Original_Texture_Format()!=WW3D_FORMAT_DXT4 &&
		thumb->Get_Original_Texture_Format()!=WW3D_FORMAT_DXT5) {
		return false;
	}

	w=thumb->Get_Original_Texture_Width() >> reduction;
	h=thumb->Get_Original_Texture_Height() >> reduction;
	mip_count=thumb->Get_Original_Texture_Mip_Level_Count();
	format=thumb->Get_Original_Texture_Format();
	return true;
}

bool TextureLoadTaskClass::Begin_Compressed_Load(void)
{
	unsigned orig_w,orig_h,orig_mip_count;
	WW3DFormat orig_format;
	if (!Get_Texture_Information(Texture->Get_Full_Path(),Get_Reduction(),orig_w,orig_h,orig_format,orig_mip_count,true)) {
		return false;
	}

	// Destination size will be the next power of two square from the larger width and height...
	unsigned int width	= orig_w;
	unsigned int height	= orig_h;
	TextureLoader::Validate_Texture_Size(width, height);

	// If the size doesn't match, try and see if texture reduction would help... (mainly for
	// cases where loaded texture is larger than hardware limit)
	if (width != orig_w || height != orig_h) {
		for (unsigned int i = 1; i < orig_mip_count; ++i) {
			unsigned w=orig_w>>i;
			if (w<4) w=4;
			unsigned h=orig_h>>i;
			if (h<4) h=4;
			unsigned tmp_w=w;
			unsigned tmp_h=h;

			TextureLoader::Validate_Texture_Size(w,h);

			if (w == tmp_w && h == tmp_h) {
				Reduction	+= i;
				width			=	w;
				height		=	h;
				break;
			}
		}
	}

	Width		= width;
	Height	= height;
	Format	= Get_Valid_Texture_Format(orig_format, Texture->Is_Compression_Allowed());

	unsigned int mip_level_count = Get_Mip_Level_Count();

	// If texture wants all mip levels, take as many as the file contains (not necessarily all)
	// Otherwise take as many mip levels as the texture wants, not to exceed the count in file...
	if (!mip_level_count) {
		mip_level_count = orig_mip_count;//dds_file.Get_Mip_Level_Count();
	} else if (mip_level_count > orig_mip_count) {//dds_file.Get_Mip_Level_Count()) {
		mip_level_count = orig_mip_count;//dds_file.Get_Mip_Level_Count();
	}

	// Once more, verify that the mip level count is correct (in case it was changed here it might not
	// match the size...well actually it doesn't have to match but it can't be bigger than the size)
	unsigned int max_mip_level_count = 1;
	unsigned int w = 4;
	unsigned int h = 4;

	while (w < Width && h < Height) {
		w += w;
		h += h;
		max_mip_level_count++;
	}

	if (mip_level_count > max_mip_level_count) {
		mip_level_count = max_mip_level_count;
	}

	D3DTexture	= DX8Wrapper::_Create_DX8_Texture(
		Width, 
		Height, 
		Format, 
		(TextureClass::MipCountType)mip_level_count,
#ifdef USE_MANAGED_TEXTURES
		D3DPOOL_MANAGED);
#else
		D3DPOOL_SYSTEMMEM);
#endif
	MipLevelCount = mip_level_count;
	return true;
}

bool TextureLoadTaskClass::Begin_Uncompressed_Load(void)
{
	unsigned width,height,orig_mip_count;
	WW3DFormat orig_format;
	if (!Get_Texture_Information(Texture->Get_Full_Path(),Get_Reduction(),width,height,orig_format,orig_mip_count,false)) {
		return false;
	}

	WW3DFormat src_format=orig_format;
	WW3DFormat dest_format=src_format;
	dest_format=Get_Valid_Texture_Format(dest_format,false);	// No compressed destination format if reading from targa...

	if (	src_format != WW3D_FORMAT_A8R8G8B8 
		&&	src_format != WW3D_FORMAT_R8G8B8 
		&&	src_format != WW3D_FORMAT_X8R8G8B8) {
		WWDEBUG_SAY(("Invalid TGA format used in %s - only 24 and 32 bit formats should be used!\n", Texture->Get_Full_Path()));
	}

	// Destination size will be the next power of two square from the larger width and height...
	unsigned ow = width;
	unsigned oh = height;
	TextureLoader::Validate_Texture_Size(width, height);
	if (width != ow || height != oh) {
		WWDEBUG_SAY(("Invalid texture size, scaling required. Texture: %s, size: %d x %d -> %d x %d\n", Texture->Get_Full_Path(), ow, oh, width, height));
	}

	Width		= width;
	Height	= height;

	if (Format == WW3D_FORMAT_UNKNOWN) {
		Format = Get_Valid_Texture_Format(dest_format, false);
	} else {
		Format = Get_Valid_Texture_Format(Format, false);
	}

	D3DTexture = DX8Wrapper::_Create_DX8_Texture(
		Width, 
		Height, 
		Format, 
		Texture->MipLevelCount,
#ifdef USE_MANAGED_TEXTURES
		D3DPOOL_MANAGED);
#else
		D3DPOOL_SYSTEMMEM);
#endif
	return true;
}


void TextureLoadTaskClass::Lock_Surfaces(void)
{
	MipLevelCount = D3DTexture->GetLevelCount();
	for (unsigned int i = 0; i < MipLevelCount; ++i) {
		D3DLOCKED_RECT locked_rect;
		DX8_ErrorCode(
			D3DTexture->LockRect(
				i,
				&locked_rect,
				NULL,
				0));
		LockedSurfacePtr[i]		= (unsigned char *)locked_rect.pBits;
		LockedSurfacePitch[i]	= locked_rect.Pitch;
	}
}


void TextureLoadTaskClass::Unlock_Surfaces(void)
{
	for (unsigned int i = 0; i < MipLevelCount; ++i) {
		if (LockedSurfacePtr[i]) {
			WWASSERT(ThreadClass::_Get_Current_Thread_ID() == DX8Wrapper::_Get_Main_Thread_ID());
			DX8_ErrorCode(D3DTexture->UnlockRect(i));
		}
		LockedSurfacePtr[i] = NULL;
	}

#ifndef USE_MANAGED_TEXTURES
	IDirect3DTexture8* tex = DX8Wrapper::_Create_DX8_Texture(Width, Height, Format, Texture->MipLevelCount,D3DPOOL_DEFAULT);
	DX8CALL(UpdateTexture(D3DTexture,tex));
	D3DTexture->Release();
	D3DTexture=tex;
	WWDEBUG_SAY(("Created non-managed texture (%s)\n",Texture->Get_Full_Path()));
#endif

}


bool TextureLoadTaskClass::Load_Compressed_Mipmap(void)
{
	DDSFileClass dds_file(Texture->Get_Full_Path(), Get_Reduction());

	// if we can't load from file, indicate rror.
	if (!dds_file.Is_Available() || !dds_file.Load()) {
		return false;
	}

	unsigned int width	= Get_Width();
	unsigned int height	= Get_Height();

	for (unsigned int level = 0; level < Get_Mip_Level_Count(); ++level) {
		WWASSERT(width && height);
		dds_file.Copy_Level_To_Surface(
			level,
			Get_Format(),
			width,
			height,
			Get_Locked_Surface_Ptr(level),
			Get_Locked_Surface_Pitch(level));

		width		>>= 1;
		height	>>= 1;
	}

	return true;
}


bool TextureLoadTaskClass::Load_Uncompressed_Mipmap(void)
{
	if (!Get_Mip_Level_Count()) {
		return false;
	}

	Targa targa;
	if (TARGA_ERROR_HANDLER(targa.Open(Texture->Get_Full_Path(), TGA_READMODE), Texture->Get_Full_Path())) {
		return false;
	}

	// DX8 uses image upside down compared to TGA
	targa.Header.ImageDescriptor ^= TGAIDF_YORIGIN;

	WW3DFormat src_format;
	WW3DFormat dest_format;
	unsigned int src_bpp = 0;
	Get_WW3D_Format(dest_format,src_format,src_bpp,targa);
	if (src_format==WW3D_FORMAT_UNKNOWN) return false;

	dest_format = Get_Format();	// Texture can be requested in different format than the most obvious from the TGA

	char palette[256*4];
	targa.SetPalette(palette);

	unsigned int src_width	= targa.Header.Width;
	unsigned int src_height	= targa.Header.Height;
	unsigned int width		= Get_Width();
	unsigned int height		= Get_Height();

	// NOTE: We load the palette but we do not yet support paletted textures!
	if (TARGA_ERROR_HANDLER(targa.Load(Texture->Get_Full_Path(), TGAF_IMAGE, false), Texture->Get_Full_Path())) {
		return false;
	}

	unsigned char * src_surface			= (unsigned char*)targa.GetImage();
	unsigned char * converted_surface	= NULL;

	// No paletted format allowed when generating mipmaps
	if (	src_format	== WW3D_FORMAT_A1R5G5B5 
		|| src_format	== WW3D_FORMAT_R5G6B5 
		|| src_format	== WW3D_FORMAT_A4R4G4B4 
		||	src_format	== WW3D_FORMAT_P8 
		|| src_format	== WW3D_FORMAT_L8 
		|| src_width	!= width 
		|| src_height	!= height) {

		converted_surface = new unsigned char[width*height*4];
		dest_format = Get_Valid_Texture_Format(WW3D_FORMAT_A8R8G8B8, false);

		BitmapHandlerClass::Copy_Image(
			converted_surface,
			width,
			height,
			width*4,
			WW3D_FORMAT_A8R8G8B8,	//dest_format,
			src_surface,
			src_width,
			src_height,
			src_width*src_bpp,
			src_format,
			(unsigned char*)targa.GetPalette(),
			targa.Header.CMapDepth>>3,
			false);

		src_surface	= converted_surface;
		src_format	= WW3D_FORMAT_A8R8G8B8;	//dest_format;
		src_width	= width;
		src_height	= height;
		src_bpp		= Get_Bytes_Per_Pixel(src_format);
	}

	unsigned src_pitch = src_width * src_bpp;

	for (unsigned int level = 0; level < Get_Mip_Level_Count(); ++level) {
		WWASSERT(Get_Locked_Surface_Ptr(level));
		BitmapHandlerClass::Copy_Image(
			Get_Locked_Surface_Ptr(level),
			width,
			height,
			Get_Locked_Surface_Pitch(level),
			Get_Format(),
			src_surface,
			src_width,
			src_height,
			src_pitch,
			src_format,
			NULL,
			0,
			true);

		width			>>= 1;
		height		>>= 1;
		src_width	>>= 1;
		src_height	>>= 1;

		if (!width || !height || !src_width || !src_height) {
			break;
		}
	}

	if (converted_surface) {
		delete[] converted_surface;
	}

	return true;
}


unsigned char * TextureLoadTaskClass::Get_Locked_Surface_Ptr(unsigned int level)
{
	WWASSERT(level<MipLevelCount);
	WWASSERT(LockedSurfacePtr[level]);
	return LockedSurfacePtr[level];
}

// ----------------------------------------------------------------------------
//
// Return locked surface pitch (in bytes) at a specific level. The call will
// assert if level is greater or equal to the number of mip levels or if the
// requested level has not been locked.
//
// ----------------------------------------------------------------------------

unsigned int TextureLoadTaskClass::Get_Locked_Surface_Pitch(unsigned int level) const
{
	WWASSERT(level<MipLevelCount);
	WWASSERT(LockedSurfacePtr[level]);
	return LockedSurfacePitch[level];
}