/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.

This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").

Doom 3 Source Code 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.

Doom 3 Source Code 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 Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/
#include "sys/platform.h"
#include "idlib/containers/List.h"
#include "framework/EventLoop.h"
#include "framework/Session.h"
#include "framework/DemoFile.h"
#include "renderer/ModelManager.h"
#include "renderer/Material.h"
#include "renderer/GuiModel.h"
#include "renderer/VertexCache.h"
#include "renderer/RenderWorld_local.h"

#include "renderer/tr_local.h"

idRenderSystemLocal	tr;
idRenderSystem	*renderSystem = &tr;


/*
=====================
R_PerformanceCounters

This prints both front and back end counters, so it should
only be called when the back end thread is idle.
=====================
*/
static void R_PerformanceCounters( void ) {
	if ( r_showPrimitives.GetInteger() != 0 ) {

		float megaBytes = globalImages->SumOfUsedImages() / ( 1024*1024.0 );

		if ( r_showPrimitives.GetInteger() > 1 ) {
			common->Printf( "v:%i ds:%i t:%i/%i v:%i/%i st:%i sv:%i image:%5.1f MB\n",
				tr.pc.c_numViews,
				backEnd.pc.c_drawElements + backEnd.pc.c_shadowElements,
				backEnd.pc.c_drawIndexes / 3,
				( backEnd.pc.c_drawIndexes - backEnd.pc.c_drawRefIndexes ) / 3,
				backEnd.pc.c_drawVertexes,
				( backEnd.pc.c_drawVertexes - backEnd.pc.c_drawRefVertexes ),
				backEnd.pc.c_shadowIndexes / 3,
				backEnd.pc.c_shadowVertexes,
				megaBytes
				);
		} else {
			common->Printf( "views:%i draws:%i tris:%i (shdw:%i) (vbo:%i) image:%5.1f MB\n",
				tr.pc.c_numViews,
				backEnd.pc.c_drawElements + backEnd.pc.c_shadowElements,
				( backEnd.pc.c_drawIndexes + backEnd.pc.c_shadowIndexes ) / 3,
				backEnd.pc.c_shadowIndexes / 3,
				backEnd.pc.c_vboIndexes / 3,
				megaBytes
				);
		}
	}

	if ( r_showDynamic.GetBool() ) {
		common->Printf( "callback:%i md5:%i dfrmVerts:%i dfrmTris:%i tangTris:%i guis:%i\n",
			tr.pc.c_entityDefCallbacks,
			tr.pc.c_generateMd5,
			tr.pc.c_deformedVerts,
			tr.pc.c_deformedIndexes/3,
			tr.pc.c_tangentIndexes/3,
			tr.pc.c_guiSurfs
			);
	}

	if ( r_showCull.GetBool() ) {
		common->Printf( "%i sin %i sclip  %i sout %i bin %i bout\n",
			tr.pc.c_sphere_cull_in, tr.pc.c_sphere_cull_clip, tr.pc.c_sphere_cull_out,
			tr.pc.c_box_cull_in, tr.pc.c_box_cull_out );
	}

	if ( r_showAlloc.GetBool() ) {
		common->Printf( "alloc:%i free:%i\n", tr.pc.c_alloc, tr.pc.c_free );
	}

	if ( r_showInteractions.GetBool() ) {
		common->Printf( "createInteractions:%i createLightTris:%i createShadowVolumes:%i\n",
			tr.pc.c_createInteractions, tr.pc.c_createLightTris, tr.pc.c_createShadowVolumes );
	}
	if ( r_showDefs.GetBool() ) {
		common->Printf( "viewEntities:%i  shadowEntities:%i  viewLights:%i\n", tr.pc.c_visibleViewEntities,
			tr.pc.c_shadowViewEntities, tr.pc.c_viewLights );
	}
	if ( r_showUpdates.GetBool() ) {
		common->Printf( "entityUpdates:%i  entityRefs:%i  lightUpdates:%i  lightRefs:%i\n",
			tr.pc.c_entityUpdates, tr.pc.c_entityReferences,
			tr.pc.c_lightUpdates, tr.pc.c_lightReferences );
	}
	if ( r_showMemory.GetBool() ) {
		int	m1 = frameData ? frameData->memoryHighwater : 0;
		common->Printf( "frameData: %i (%i)\n", R_CountFrameData(), m1 );
	}
	if ( r_showLightScale.GetBool() ) {
		common->Printf( "lightScale: %f\n", backEnd.pc.maxLightValue );
	}

	memset( &tr.pc, 0, sizeof( tr.pc ) );
	memset( &backEnd.pc, 0, sizeof( backEnd.pc ) );
}



/*
====================
R_IssueRenderCommands

Called by R_EndFrame each frame
====================
*/
static void R_IssueRenderCommands( void ) {
	if ( frameData->cmdHead->commandId == RC_NOP
		&& !frameData->cmdHead->next ) {
		// nothing to issue
		return;
	}

	// r_skipBackEnd allows the entire time of the back end
	// to be removed from performance measurements, although
	// nothing will be drawn to the screen.  If the prints
	// are going to a file, or r_skipBackEnd is later disabled,
	// usefull data can be received.

	// r_skipRender is usually more usefull, because it will still
	// draw 2D graphics
	if ( !r_skipBackEnd.GetBool() ) {
		RB_ExecuteBackEndCommands( frameData->cmdHead );
	}

	R_ClearCommandChain();
}

/*
============
R_GetCommandBuffer

Returns memory for a command buffer (stretchPicCommand_t,
drawSurfsCommand_t, etc) and links it to the end of the
current command chain.
============
*/
void *R_GetCommandBuffer( int bytes ) {
	emptyCommand_t	*cmd;

	cmd = (emptyCommand_t *)R_FrameAlloc( bytes );
	cmd->next = NULL;
	frameData->cmdTail->next = &cmd->commandId;
	frameData->cmdTail = cmd;

	return (void *)cmd;
}


/*
====================
R_ClearCommandChain

Called after every buffer submission
and by R_ToggleSmpFrame
====================
*/
void R_ClearCommandChain( void ) {
	// clear the command chain
	frameData->cmdHead = frameData->cmdTail = (emptyCommand_t *)R_FrameAlloc( sizeof( *frameData->cmdHead ) );
	frameData->cmdHead->commandId = RC_NOP;
	frameData->cmdHead->next = NULL;
}

/*
=================
R_ViewStatistics
=================
*/
static void R_ViewStatistics( viewDef_t *parms ) {
	// report statistics about this view
	if ( !r_showSurfaces.GetBool() ) {
		return;
	}
	common->Printf( "view:%p surfs:%i\n", parms, parms->numDrawSurfs );
}

/*
=============
R_AddDrawViewCmd

This is the main 3D rendering command.  A single scene may
have multiple views if a mirror, portal, or dynamic texture is present.
=============
*/
void	R_AddDrawViewCmd( viewDef_t *parms ) {
	drawSurfsCommand_t	*cmd;

	cmd = (drawSurfsCommand_t *)R_GetCommandBuffer( sizeof( *cmd ) );
	cmd->commandId = RC_DRAW_VIEW;

	cmd->viewDef = parms;

	tr.pc.c_numViews++;

	R_ViewStatistics( parms );
}


//=================================================================================


/*
=============
R_CheckCvars

See if some cvars that we watch have changed
=============
*/
static void R_CheckCvars( void ) {
	globalImages->CheckCvars();

	// gamma stuff
	if ( r_gamma.IsModified() || r_brightness.IsModified() ) {
		r_gamma.ClearModified();
		r_brightness.ClearModified();
		R_SetColorMappings();
	}

	if ( r_gammaInShader.IsModified() ) {
		r_gammaInShader.ClearModified();
		// reload shaders so they either add or remove the code for setting gamma/brightness in shader
		R_ReloadARBPrograms_f( idCmdArgs() );

		if ( r_gammaInShader.GetBool() ) {
			common->Printf( "Will apply r_gamma and r_brightness in shaders\n" );
			GLimp_ResetGamma(); // reset hardware gamma
		} else {
			common->Printf( "Will apply r_gamma and r_brightness in hardware (possibly on all screens)\n" );
			R_SetColorMappings();
		}
	}

	if ( r_swapInterval.IsModified() ) {
		GLimp_SetSwapInterval( r_swapInterval.GetInteger() );
		r_swapInterval.ClearModified();
	}

	if ( r_windowResizable.IsModified() ) {
		GLimp_SetWindowResizable( r_windowResizable.GetBool() );
		r_windowResizable.ClearModified();
	}
}

/*
=============
idRenderSystemLocal::idRenderSystemLocal
=============
*/
idRenderSystemLocal::idRenderSystemLocal( void ) {
	Clear();
}

/*
=============
idRenderSystemLocal::~idRenderSystemLocal
=============
*/
idRenderSystemLocal::~idRenderSystemLocal( void ) {
}

/*
=============
SetColor

This can be used to pass general information to the current material, not
just colors
=============
*/
void idRenderSystemLocal::SetColor( const idVec4 &rgba ) {
	guiModel->SetColor( rgba[0], rgba[1], rgba[2], rgba[3] );
}


/*
=============
SetColor4
=============
*/
void idRenderSystemLocal::SetColor4( float r, float g, float b, float a ) {
	guiModel->SetColor( r, g, b, a );
}

/*
=============
DrawStretchPic
=============
*/
void idRenderSystemLocal::DrawStretchPic( const idDrawVert *verts, const glIndex_t *indexes, int vertCount, int indexCount, const idMaterial *material,
									   bool clip, float min_x, float min_y, float max_x, float max_y ) {
	guiModel->DrawStretchPic( verts, indexes, vertCount, indexCount, material,
		clip, min_x, min_y, max_x, max_y );
}

/*
=============
DrawStretchPic

x/y/w/h are in the 0,0 to 640,480 range
=============
*/
void idRenderSystemLocal::DrawStretchPic( float x, float y, float w, float h, float s1, float t1, float s2, float t2, const idMaterial *material ) {
	guiModel->DrawStretchPic( x, y, w, h, s1, t1, s2, t2, material );
}

/*
=============
DrawStretchTri

x/y/w/h are in the 0,0 to 640,480 range
=============
*/
void idRenderSystemLocal::DrawStretchTri( idVec2 p1, idVec2 p2, idVec2 p3, idVec2 t1, idVec2 t2, idVec2 t3, const idMaterial *material ) {
	tr.guiModel->DrawStretchTri( p1, p2, p3, t1, t2, t3, material );
}

/*
=============
GlobalToNormalizedDeviceCoordinates
=============
*/
void idRenderSystemLocal::GlobalToNormalizedDeviceCoordinates( const idVec3 &global, idVec3 &ndc ) {
	R_GlobalToNormalizedDeviceCoordinates( global, ndc );
}

/*
=============
GlobalToNormalizedDeviceCoordinates
=============
*/
void idRenderSystemLocal::GetGLSettings( int& width, int& height ) {
	width = glConfig.vidWidth;
	height = glConfig.vidHeight;
}

/*
=====================
idRenderSystemLocal::DrawSmallChar

small chars are drawn at native screen resolution
=====================
*/
void idRenderSystemLocal::DrawSmallChar( int x, int y, int ch, const idMaterial *material ) {
	int row, col;
	float frow, fcol;
	float size;

	ch &= 255;

	if ( ch == ' ' ) {
		return;
	}

	if ( y < -SMALLCHAR_HEIGHT ) {
		return;
	}

	row = ch >> 4;
	col = ch & 15;

	frow = row * 0.0625f;
	fcol = col * 0.0625f;
	size = 0.0625f;

	DrawStretchPic( x, y, SMALLCHAR_WIDTH, SMALLCHAR_HEIGHT,
					   fcol, frow,
					   fcol + size, frow + size,
					   material );
}

/*
==================
idRenderSystemLocal::DrawSmallString[Color]

Draws a multi-colored string with a drop shadow, optionally forcing
to a fixed color.

Coordinates are at 640 by 480 virtual resolution
==================
*/
void idRenderSystemLocal::DrawSmallStringExt( int x, int y, const char *string, const idVec4 &setColor, bool forceColor, const idMaterial *material ) {
	idVec4		color;
	const unsigned char	*s;
	int			xx;

	// draw the colored text
	s = (const unsigned char*)string;
	xx = x;
	SetColor( setColor );
	while ( *s ) {
		if ( idStr::IsColor( (const char*)s ) ) {
			if ( !forceColor ) {
				if ( *(s+1) == C_COLOR_DEFAULT ) {
					SetColor( setColor );
				} else {
					color = idStr::ColorForIndex( *(s+1) );
					color[3] = setColor[3];
					SetColor( color );
				}
			}
			s += 2;
			continue;
		}
		DrawSmallChar( xx, y, *s, material );
		xx += SMALLCHAR_WIDTH;
		s++;
	}
	SetColor( colorWhite );
}

/*
=====================
idRenderSystemLocal::DrawBigChar
=====================
*/
void idRenderSystemLocal::DrawBigChar( int x, int y, int ch, const idMaterial *material ) {
	int row, col;
	float frow, fcol;
	float size;

	ch &= 255;

	if ( ch == ' ' ) {
		return;
	}

	if ( y < -BIGCHAR_HEIGHT ) {
		return;
	}

	row = ch >> 4;
	col = ch & 15;

	frow = row * 0.0625f;
	fcol = col * 0.0625f;
	size = 0.0625f;

	DrawStretchPic( x, y, BIGCHAR_WIDTH, BIGCHAR_HEIGHT,
					   fcol, frow,
					   fcol + size, frow + size,
					   material );
}

/*
==================
idRenderSystemLocal::DrawBigString[Color]

Draws a multi-colored string with a drop shadow, optionally forcing
to a fixed color.

Coordinates are at 640 by 480 virtual resolution
==================
*/
void idRenderSystemLocal::DrawBigStringExt( int x, int y, const char *string, const idVec4 &setColor, bool forceColor, const idMaterial *material ) {
	idVec4		color;
	const char	*s;
	int			xx;

	// draw the colored text
	s = string;
	xx = x;
	SetColor( setColor );
	while ( *s ) {
		if ( idStr::IsColor( s ) ) {
			if ( !forceColor ) {
				if ( *(s+1) == C_COLOR_DEFAULT ) {
					SetColor( setColor );
				} else {
					color = idStr::ColorForIndex( *(s+1) );
					color[3] = setColor[3];
					SetColor( color );
				}
			}
			s += 2;
			continue;
		}
		DrawBigChar( xx, y, *s, material );
		xx += BIGCHAR_WIDTH;
		s++;
	}
	SetColor( colorWhite );
}

//======================================================================================

/*
==================
SetBackEndRenderer

Check for changes in the back end renderSystem, possibly invalidating cached data
==================
*/
void idRenderSystemLocal::SetBackEndRenderer() {
	if ( !r_renderer.IsModified() ) {
		return;
	}

	bool oldVPstate = backEndRendererHasVertexPrograms;

	backEndRenderer = BE_BAD;

	if ( idStr::Icmp( r_renderer.GetString(), "arb2" ) == 0 ) {
		if ( glConfig.allowARB2Path ) {
			backEndRenderer = BE_ARB2;
		}
	}

	// fallback
	if ( backEndRenderer == BE_BAD ) {
		// choose the best
		if ( glConfig.allowARB2Path ) {
			backEndRenderer = BE_ARB2;
		}
	}

	backEndRendererHasVertexPrograms = false;
	backEndRendererMaxLight = 1.0;

	switch( backEndRenderer ) {
	case BE_ARB2:
		common->Printf( "using ARB2 renderSystem\n" );
		backEndRendererHasVertexPrograms = true;
		backEndRendererMaxLight = 999;
		break;
	default:
		common->FatalError( "SetbackEndRenderer: bad back end" );
	}

	// clear the vertex cache if we are changing between
	// using vertex programs and not, because specular and
	// shadows will be different data
	if ( oldVPstate != backEndRendererHasVertexPrograms ) {
		vertexCache.PurgeAll();
		if ( primaryWorld ) {
			primaryWorld->FreeInteractions();
		}
	}

	r_renderer.ClearModified();
}

/*
====================
BeginFrame
====================
*/
void idRenderSystemLocal::BeginFrame( int windowWidth, int windowHeight ) {
	setBufferCommand_t	*cmd;

	if ( !glConfig.isInitialized ) {
		return;
	}

	// DG: r_lockSurfaces only works properly if r_useScissor is disabled
	if ( r_lockSurfaces.IsModified() ) {
		static bool origUseScissor = true;
		r_lockSurfaces.ClearModified();
		if ( r_lockSurfaces.GetBool() ) {
			origUseScissor = r_useScissor.GetBool();
			r_useScissor.SetBool( false );
		} else {
			r_useScissor.SetBool( origUseScissor );
		}
	} // DG end

	// determine which back end we will use
	SetBackEndRenderer();

	guiModel->Clear();

	// for the larger-than-window tiled rendering screenshots
	if ( tiledViewport[0] ) {
		windowWidth = tiledViewport[0];
		windowHeight = tiledViewport[1];
	}

	// DG: save the original size, so editors don't mess up the game viewport
	//     with their tiny (texture-preview etc) viewports.
	origWidth = glConfig.vidWidth;
	origHeight = glConfig.vidHeight;

	glConfig.vidWidth = windowWidth;
	glConfig.vidHeight = windowHeight;

	renderCrops[0].x = 0;
	renderCrops[0].y = 0;
	renderCrops[0].width = windowWidth;
	renderCrops[0].height = windowHeight;
	currentRenderCrop = 0;

	// screenFraction is just for quickly testing fill rate limitations
	if ( r_screenFraction.GetInteger() != 100 ) {
		int	w = SCREEN_WIDTH * r_screenFraction.GetInteger() / 100.0f;
		int h = SCREEN_HEIGHT * r_screenFraction.GetInteger() / 100.0f;
		CropRenderSize( w, h );
	}


	// this is the ONLY place this is modified
	frameCount++;

	// just in case we did a common->Error while this
	// was set
	guiRecursionLevel = 0;

	// the first rendering will be used for commands like
	// screenshot, rather than a possible subsequent remote
	// or mirror render
//	primaryWorld = NULL;

	// set the time for shader effects in 2D rendering
	frameShaderTime = eventLoop->Milliseconds() * 0.001;

	//
	// draw buffer stuff
	//
	cmd = (setBufferCommand_t *)R_GetCommandBuffer( sizeof( *cmd ) );
	cmd->commandId = RC_SET_BUFFER;
	cmd->frameCount = frameCount;

	if ( r_frontBuffer.GetBool() ) {
		cmd->buffer = (int)GL_FRONT;
	} else {
		cmd->buffer = (int)GL_BACK;
	}
}

void idRenderSystemLocal::WriteDemoPics() {
	session->writeDemo->WriteInt( DS_RENDER );
	session->writeDemo->WriteInt( DC_GUI_MODEL );
	guiModel->WriteToDemo( session->writeDemo );
}

void idRenderSystemLocal::DrawDemoPics() {
	demoGuiModel->EmitFullScreen();
}

/*
=============
EndFrame

Returns the number of msec spent in the back end
=============
*/
void idRenderSystemLocal::EndFrame( int *frontEndMsec, int *backEndMsec ) {
	emptyCommand_t *cmd;

	if ( !glConfig.isInitialized ) {
		return;
	}

	// close any gui drawing
	guiModel->EmitFullScreen();
	guiModel->Clear();

	// save out timing information
	if ( frontEndMsec ) {
		*frontEndMsec = pc.frontEndMsec;
	}
	if ( backEndMsec ) {
		*backEndMsec = backEnd.pc.msec;
	}

	// print any other statistics and clear all of them
	R_PerformanceCounters();

	// check for dynamic changes that require some initialization
	R_CheckCvars();

	// check for errors
	GL_CheckErrors();

	// add the swapbuffers command
	cmd = (emptyCommand_t *)R_GetCommandBuffer( sizeof( *cmd ) );
	cmd->commandId = RC_SWAP_BUFFERS;

	// start the back end up again with the new command list
	R_IssueRenderCommands();

	// use the other buffers next frame, because another CPU
	// may still be rendering into the current buffers

	R_ToggleSmpFrame();

	// we can now release the vertexes used this frame
	vertexCache.EndFrame();

	if ( session->writeDemo ) {
		session->writeDemo->WriteInt( DS_RENDER );
		session->writeDemo->WriteInt( DC_END_FRAME );
		if ( r_showDemo.GetBool() ) {
			common->Printf( "write DC_END_FRAME\n" );
		}
	}

	// DG: restore the original size that was set before BeginFrame() overwrote it
	//     with its function-arguments, so editors don't mess up our viewport.
	//     (unsure why/how this at least *kinda* worked in original Doom3,
	//      maybe glConfig.vidWidth/Height was reset if the window gained focus or sth)
	glConfig.vidWidth = origWidth;
	glConfig.vidHeight = origHeight;
}

/*
=====================
RenderViewToViewport

Converts from SCREEN_WIDTH / SCREEN_HEIGHT coordinates to current cropped pixel coordinates
=====================
*/
void idRenderSystemLocal::RenderViewToViewport( const renderView_t *renderView, idScreenRect *viewport ) {
	renderCrop_t	*rc = &renderCrops[currentRenderCrop];

	float wRatio = (float)rc->width / SCREEN_WIDTH;
	float hRatio = (float)rc->height / SCREEN_HEIGHT;

	viewport->x1 = idMath::Ftoi( rc->x + renderView->x * wRatio );
	viewport->x2 = idMath::Ftoi( rc->x + floor( ( renderView->x + renderView->width ) * wRatio + 0.5f ) - 1 );
	viewport->y1 = idMath::Ftoi( ( rc->y + rc->height ) - floor( ( renderView->y + renderView->height ) * hRatio + 0.5f ) );
	viewport->y2 = idMath::Ftoi( ( rc->y + rc->height ) - floor( renderView->y * hRatio + 0.5f ) - 1 );
}

static int RoundDownToPowerOfTwo( int v ) {
	int	i;

	for ( i = 0 ; i < 20 ; i++ ) {
		if ( ( 1 << i ) == v ) {
			return v;
		}
		if ( ( 1 << i ) > v ) {
			return 1 << ( i-1 );
		}
	}
	return 1<<i;
}

/*
================
CropRenderSize

This automatically halves sizes until it fits in the current window size,
so if you specify a power of two size for a texture copy, it may be shrunk
down, but still valid.
================
*/
void	idRenderSystemLocal::CropRenderSize( int width, int height, bool makePowerOfTwo, bool forceDimensions ) {
	if ( !glConfig.isInitialized ) {
		return;
	}

	// close any gui drawing before changing the size
	guiModel->EmitFullScreen();
	guiModel->Clear();

	if ( width < 1 || height < 1 ) {
		common->Error( "CropRenderSize: bad sizes" );
	}

	if ( session->writeDemo ) {
		session->writeDemo->WriteInt( DS_RENDER );
		session->writeDemo->WriteInt( DC_CROP_RENDER );
		session->writeDemo->WriteInt( width );
		session->writeDemo->WriteInt( height );
		session->writeDemo->WriteInt( makePowerOfTwo );

		if ( r_showDemo.GetBool() ) {
			common->Printf( "write DC_CROP_RENDER\n" );
		}
	}

	// convert from virtual SCREEN_WIDTH/SCREEN_HEIGHT coordinates to physical OpenGL pixels
	renderView_t renderView;
	renderView.x = 0;
	renderView.y = 0;
	renderView.width = width;
	renderView.height = height;

	idScreenRect	r;
	RenderViewToViewport( &renderView, &r );

	width = r.x2 - r.x1 + 1;
	height = r.y2 - r.y1 + 1;

	if ( forceDimensions ) {
		// just give exactly what we ask for
		width = renderView.width;
		height = renderView.height;
	}

	// if makePowerOfTwo, drop to next lower power of two after scaling to physical pixels
	if ( makePowerOfTwo ) {
		width = RoundDownToPowerOfTwo( width );
		height = RoundDownToPowerOfTwo( height );
		// FIXME: megascreenshots with offset viewports don't work right with this yet
	}

	renderCrop_t	*rc = &renderCrops[currentRenderCrop];

	// we might want to clip these to the crop window instead
	while ( width > glConfig.vidWidth ) {
		width >>= 1;
	}
	while ( height > glConfig.vidHeight ) {
		height >>= 1;
	}

	if ( currentRenderCrop == MAX_RENDER_CROPS ) {
		common->Error( "idRenderSystemLocal::CropRenderSize: currentRenderCrop == MAX_RENDER_CROPS" );
	}

	currentRenderCrop++;

	rc = &renderCrops[currentRenderCrop];

	rc->x = 0;
	rc->y = 0;
	rc->width = width;
	rc->height = height;
}

/*
================
UnCrop
================
*/
void idRenderSystemLocal::UnCrop() {
	if ( !glConfig.isInitialized ) {
		return;
	}

	if ( currentRenderCrop < 1 ) {
		common->Error( "idRenderSystemLocal::UnCrop: currentRenderCrop < 1" );
	}

	// close any gui drawing
	guiModel->EmitFullScreen();
	guiModel->Clear();

	currentRenderCrop--;

	if ( session->writeDemo ) {
		session->writeDemo->WriteInt( DS_RENDER );
		session->writeDemo->WriteInt( DC_UNCROP_RENDER );

		if ( r_showDemo.GetBool() ) {
			common->Printf( "write DC_UNCROP\n" );
		}
	}
}

/*
================
CaptureRenderToImage
================
*/
void idRenderSystemLocal::CaptureRenderToImage( const char *imageName ) {
	if ( !glConfig.isInitialized ) {
		return;
	}
	guiModel->EmitFullScreen();
	guiModel->Clear();

	if ( session->writeDemo ) {
		session->writeDemo->WriteInt( DS_RENDER );
		session->writeDemo->WriteInt( DC_CAPTURE_RENDER );
		session->writeDemo->WriteHashString( imageName );

		if ( r_showDemo.GetBool() ) {
			common->Printf( "write DC_CAPTURE_RENDER: %s\n", imageName );
		}
	}

	// look up the image before we create the render command, because it
	// may need to sync to create the image
	idImage	*image = globalImages->ImageFromFile(imageName, TF_DEFAULT, true, TR_REPEAT, TD_DEFAULT);

	renderCrop_t *rc = &renderCrops[currentRenderCrop];

	copyRenderCommand_t *cmd = (copyRenderCommand_t *)R_GetCommandBuffer( sizeof( *cmd ) );
	cmd->commandId = RC_COPY_RENDER;
	cmd->x = rc->x;
	cmd->y = rc->y;
	cmd->imageWidth = rc->width;
	cmd->imageHeight = rc->height;
	cmd->image = image;

	guiModel->Clear();
}

/*
==============
CaptureRenderToFile

==============
*/
void idRenderSystemLocal::CaptureRenderToFile( const char *fileName, bool fixAlpha ) {
	if ( !glConfig.isInitialized ) {
		return;
	}

	renderCrop_t *rc = &renderCrops[currentRenderCrop];

	guiModel->EmitFullScreen();
	guiModel->Clear();
	R_IssueRenderCommands();

	qglReadBuffer( GL_BACK );

	// include extra space for OpenGL padding to word boundaries
	int	c = ( rc->width + 3 ) * rc->height;
	byte *data = (byte *)R_StaticAlloc( c * 3 );

	qglReadPixels( rc->x, rc->y, rc->width, rc->height, GL_RGB, GL_UNSIGNED_BYTE, data );

	byte *data2 = (byte *)R_StaticAlloc( c * 4 );

	for ( int i = 0 ; i < c ; i++ ) {
		data2[ i * 4 ] = data[ i * 3 ];
		data2[ i * 4 + 1 ] = data[ i * 3 + 1 ];
		data2[ i * 4 + 2 ] = data[ i * 3 + 2 ];
		data2[ i * 4 + 3 ] = 0xff;
	}

	R_WriteTGA( fileName, data2, rc->width, rc->height, true );

	R_StaticFree( data );
	R_StaticFree( data2 );
}


/*
==============
AllocRenderWorld
==============
*/
idRenderWorld *idRenderSystemLocal::AllocRenderWorld() {
	idRenderWorldLocal *rw;
	rw = new idRenderWorldLocal;
	worlds.Append( rw );
	return rw;
}

/*
==============
FreeRenderWorld
==============
*/
void idRenderSystemLocal::FreeRenderWorld( idRenderWorld *rw ) {
	if ( primaryWorld == rw ) {
		primaryWorld = NULL;
	}
	worlds.Remove( static_cast<idRenderWorldLocal *>(rw) );
	delete rw;
}

/*
==============
PrintMemInfo
==============
*/
void idRenderSystemLocal::PrintMemInfo( MemInfo_t *mi ) {
	// sum up image totals
	globalImages->PrintMemInfo( mi );

	// sum up model totals
	renderModelManager->PrintMemInfo( mi );

	// compute render totals

}

/*
===============
idRenderSystemLocal::UploadImage
===============
*/
bool idRenderSystemLocal::UploadImage( const char *imageName, const byte *data, int width, int height  ) {
	idImage *image = globalImages->GetImage( imageName );
	if ( !image ) {
		return false;
	}
	image->UploadScratch( data, width, height );
	image->SetImageFilterAndRepeat();
	return true;
}
