/*
cl_scrn.c - refresh screen
Copyright (C) 2007 Uncle Mike

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.
*/

#include "common.h"
#include "client.h"
#include "gl_local.h"
#include "vgui_draw.h"
#include "qfont.h"

convar_t *scr_centertime;
convar_t *scr_loading;
convar_t *scr_download;
convar_t *scr_width;
convar_t *scr_height;
convar_t *scr_viewsize;
convar_t *cl_testlights;
convar_t *cl_allow_levelshots;
convar_t *cl_levelshot_name;
convar_t *cl_envshot_size;
convar_t *scr_dark;

typedef struct
{
	int	x1, y1, x2, y2;
} dirty_t;

static dirty_t	scr_dirty, scr_old_dirty[2];
static qboolean	scr_init = false;

/*
==============
SCR_DrawFPS
==============
*/
void SCR_DrawFPS( int height )
{
	float		calc;
	rgba_t		color;
	double		newtime;
	static double	nexttime = 0, lasttime = 0;
	static double	framerate = 0;
	static int	framecount = 0;
	static int	minfps = 9999;
	static int	maxfps = 0;
	char		fpsstring[64];
	int		offset;

	if( cls.state != ca_active || !cl_showfps->integer || cl.background )
		return; 

	switch( cls.scrshot_action )
	{
	case scrshot_normal:
	case scrshot_snapshot:
	case scrshot_inactive:
		break;
	default: return;
	}

	newtime = Sys_DoubleTime();
	if( newtime >= nexttime )
	{
		framerate = framecount / (newtime - lasttime);
		lasttime = newtime;
		nexttime = Q_max( nexttime + 1.0, lasttime - 1.0 );
		framecount = 0;
	}

	calc = framerate;
	framecount++;

	if( calc < 1.0f )
	{
		Q_snprintf( fpsstring, sizeof( fpsstring ), "%4i spf", (int)(1.0f / calc + 0.5f));
		MakeRGBA( color, 255, 0, 0, 255 );
	}
	else
	{
		int	curfps = (int)(calc + 0.5f);

		if( curfps < minfps ) minfps = curfps;
		if( curfps > maxfps ) maxfps = curfps;

		if( cl_showfps->integer == 2 )
			Q_snprintf( fpsstring, sizeof( fpsstring ), "fps: ^1%4i min, ^3%4i cur, ^2%4i max", minfps, curfps, maxfps );
		else Q_snprintf( fpsstring, sizeof( fpsstring ), "%4i fps", curfps );
		MakeRGBA( color, 255, 255, 255, 255 );
          }

	Con_DrawStringLen( fpsstring, &offset, NULL );
	Con_DrawString( scr_width->integer - offset - 4, height, fpsstring, color );
}

/*
==============
SCR_NetSpeeds

same as r_speeds but for network channel
==============
*/
void SCR_NetSpeeds( void )
{
	static char	msg[MAX_SYSPATH];
	int		x, y, height;
	char		*p, *start, *end;
	float		time = cl.mtime[0];
	static int	min_svfps = 100;
	static int	max_svfps = 0;
	int		cur_svfps = 0;
	static int	min_clfps = 100;
	static int	max_clfps = 0;
	int		cur_clfps = 0;
	rgba_t		color;

	if( !net_speeds->integer || cls.demoplayback || cls.state != ca_active )
		return;

	if( cl_serverframetime() != 0 )
	{
		cur_svfps = Q_rint( 1.0f / cl_serverframetime( ));
		if( cur_svfps < min_svfps ) min_svfps = cur_svfps;
		if( cur_svfps > max_svfps ) max_svfps = cur_svfps;
	}

	if( cl_clientframetime() != 0 )
	{
		cur_clfps = Q_rint( 1.0f / cl_clientframetime( ));
		if( cur_clfps < min_clfps ) min_clfps = cur_clfps;
		if( cur_clfps > max_clfps ) max_clfps = cur_clfps;
	}

	Q_snprintf( msg, sizeof( msg ), "sv fps: ^1%4i min, ^3%4i cur, ^2%4i max\ncl fps: ^1%4i min, ^3%4i cur, ^2%4i max\nGame Time: %02d:%02d\nTotal sended to server: %s\nTotal received from server: %s\n",
	min_svfps, cur_svfps, max_svfps, min_clfps, cur_clfps, max_clfps, (int)(time / 60.0f ), (int)fmod( time, 60.0f ), Q_memprint( cls.netchan.total_sended ), Q_memprint( cls.netchan.total_received ));

	x = scr_width->integer - 320;
	y = 384;

	Con_DrawStringLen( NULL, NULL, &height );
	MakeRGBA( color, 255, 255, 255, 255 );

	p = start = msg;

	do
	{
		end = Q_strchr( p, '\n' );
		if( end ) msg[end-start] = '\0';

		Con_DrawString( x, y, p, color );
		y += height;

		if( end ) p = end + 1;
		else break;
	} while( 1 );
}

/*
================
SCR_RSpeeds
================
*/
void SCR_RSpeeds( void )
{
	char	msg[MAX_SYSPATH];

	if( R_SpeedsMessage( msg, sizeof( msg )))
	{
		int	x, y, height;
		char	*p, *start, *end;
		rgba_t	color;

		x = scr_width->integer - 340;
		y = 64;

		Con_DrawStringLen( NULL, NULL, &height );
		MakeRGBA( color, 255, 255, 255, 255 );

		p = start = msg;
		do
		{
			end = Q_strchr( p, '\n' );
			if( end ) msg[end-start] = '\0';

			Con_DrawString( x, y, p, color );
			y += height;

			if( end ) p = end + 1;
			else break;
		} while( 1 );
	}
}

void SCR_MakeLevelShot( void )
{
	if( cls.scrshot_request != scrshot_plaque )
		return;

	// make levelshot at nextframe()
	Cbuf_AddText( "levelshot\n" );
}

void SCR_MakeScreenShot( void )
{
	qboolean	iRet = false;
	int	viewsize;

	if( cls.envshot_viewsize > 0 )
		viewsize = cls.envshot_viewsize;
	else viewsize = cl_envshot_size->integer;

	switch( cls.scrshot_action )
	{
	case scrshot_normal:
		iRet = VID_ScreenShot( cls.shotname, VID_SCREENSHOT );
		break;
	case scrshot_snapshot:
		iRet = VID_ScreenShot( cls.shotname, VID_SNAPSHOT );
		break;
	case scrshot_plaque:
		iRet = VID_ScreenShot( cls.shotname, VID_LEVELSHOT );
		break;
	case scrshot_savegame:
	case scrshot_demoshot:
		iRet = VID_ScreenShot( cls.shotname, VID_MINISHOT );
		break;
	case scrshot_envshot:
		iRet = VID_CubemapShot( cls.shotname, viewsize, cls.envshot_vieworg, false );
		break;
	case scrshot_skyshot:
		iRet = VID_CubemapShot( cls.shotname, viewsize, cls.envshot_vieworg, true );
		break;
	case scrshot_mapshot:
		iRet = VID_ScreenShot( cls.shotname, VID_MAPSHOT );
		break;
	case scrshot_inactive:
		return;
	}

	// report
	if( iRet )
	{
		// snapshots don't writes message about image		
		if( cls.scrshot_action != scrshot_snapshot )
			MsgDev( D_REPORT, "Write %s\n", cls.shotname );
	}
	else MsgDev( D_ERROR, "Unable to write %s\n", cls.shotname );

	cls.envshot_vieworg = NULL;
	cls.scrshot_action = scrshot_inactive;
	cls.envshot_disable_vis = false;
	cls.envshot_viewsize = 0;
	cls.shotname[0] = '\0';
}

void SCR_DrawPlaque( void )
{
	int	levelshot;

	if(( cl_allow_levelshots->integer && !cls.changelevel ) || cl.background )
	{
		levelshot = GL_LoadTexture( cl_levelshot_name->string, NULL, 0, TF_IMAGE, NULL );
		GL_SetRenderMode( kRenderNormal );
		R_DrawStretchPic( 0, 0, scr_width->integer, scr_height->integer, 0, 0, 1, 1, levelshot );
		if( !cl.background ) CL_DrawHUD( CL_LOADING );
	}
}

/*
================
SCR_BeginLoadingPlaque
================
*/
void SCR_BeginLoadingPlaque( qboolean is_background )
{
	S_StopAllSounds();
	cl.audio_prepped = false;			// don't play ambients

	if( cls.disable_screen ) return;		// already set
	if( cls.state == ca_disconnected ) return;	// if at console, don't bring up the plaque
	if( cls.key_dest == key_console ) return;

	cls.draw_changelevel = is_background ? false : true;
	SCR_UpdateScreen();
	cls.disable_screen = host.realtime;
	cls.disable_servercount = cl.servercount;
	cl.background = is_background;		// set right state before svc_serverdata is came
}

/*
================
SCR_EndLoadingPlaque
================
*/
void SCR_EndLoadingPlaque( void )
{
	cls.disable_screen = 0.0f;
	Con_ClearNotify();
}

/*
=================
SCR_AddDirtyPoint
=================
*/
void SCR_AddDirtyPoint( int x, int y )
{
	if( x < scr_dirty.x1 ) scr_dirty.x1 = x;
	if( x > scr_dirty.x2 ) scr_dirty.x2 = x;
	if( y < scr_dirty.y1 ) scr_dirty.y1 = y;
	if( y > scr_dirty.y2 ) scr_dirty.y2 = y;
}

/*
================
SCR_DirtyScreen
================
*/
void SCR_DirtyScreen( void )
{
	SCR_AddDirtyPoint( 0, 0 );
	SCR_AddDirtyPoint( scr_width->integer - 1, scr_height->integer - 1 );
}

/*
================
SCR_TileClear
================
*/
void SCR_TileClear( void )
{
	int	i, top, bottom, left, right;
	dirty_t	clear;

	if( scr_viewsize->integer >= 120 )
		return; // full screen rendering

	// erase rect will be the union of the past three frames
	// so tripple buffering works properly
	clear = scr_dirty;

	for( i = 0; i < 2; i++ )
	{
		if( scr_old_dirty[i].x1 < clear.x1 )
			clear.x1 = scr_old_dirty[i].x1;
		if( scr_old_dirty[i].x2 > clear.x2 )
			clear.x2 = scr_old_dirty[i].x2;
		if( scr_old_dirty[i].y1 < clear.y1 )
			clear.y1 = scr_old_dirty[i].y1;
		if( scr_old_dirty[i].y2 > clear.y2 )
			clear.y2 = scr_old_dirty[i].y2;
	}

	scr_old_dirty[1] = scr_old_dirty[0];
	scr_old_dirty[0] = scr_dirty;

	scr_dirty.x1 = 9999;
	scr_dirty.x2 = -9999;
	scr_dirty.y1 = 9999;
	scr_dirty.y2 = -9999;

	if( clear.y2 <= clear.y1 )
		return; // nothing disturbed

	top = cl.refdef.viewport[1];
	bottom = top + cl.refdef.viewport[3] - 1;
	left = cl.refdef.viewport[0];
	right = left + cl.refdef.viewport[2] - 1;

	if( clear.y1 < top )
	{	
		// clear above view screen
		i = clear.y2 < top-1 ? clear.y2 : top - 1;
		R_DrawTileClear( clear.x1, clear.y1, clear.x2 - clear.x1 + 1, i - clear.y1 + 1 );
		clear.y1 = top;
	}

	if( clear.y2 > bottom )
	{	
		// clear below view screen
		i = clear.y1 > bottom + 1 ? clear.y1 : bottom + 1;
		R_DrawTileClear( clear.x1, i, clear.x2 - clear.x1 + 1, clear.y2 - i + 1 );
		clear.y2 = bottom;
	}

	if( clear.x1 < left )
	{
		// clear left of view screen
		i = clear.x2 < left - 1 ? clear.x2 : left - 1;
		R_DrawTileClear( clear.x1, clear.y1, i - clear.x1 + 1, clear.y2 - clear.y1 + 1 );
		clear.x1 = left;
	}

	if( clear.x2 > right )
	{	
		// clear left of view screen
		i = clear.x1 > right + 1 ? clear.x1 : right + 1;
		R_DrawTileClear( i, clear.y1, clear.x2 - i + 1, clear.y2 - clear.y1 + 1 );
		clear.x2 = right;
	}
}

/*
==================
SCR_UpdateScreen

This is called every frame, and can also be called explicitly to flush
text to the screen.
==================
*/
void SCR_UpdateScreen( void )
{
	if( !V_PreRender( )) return;

	switch( cls.state )
	{
	case ca_disconnected:
		break;
	case ca_connecting:
	case ca_connected:
		SCR_DrawPlaque();
		break;
	case ca_active:
		V_RenderView();
		break;
	case ca_cinematic:
		SCR_DrawCinematic();
		break;
	default:
		Host_Error( "SCR_UpdateScreen: bad cls.state\n" );
		break;
	}

	V_PostRender();
}

void SCR_LoadCreditsFont( void )
{
	int	fontWidth;

	if( cls.creditsFont.valid ) return; // already loaded

	cls.creditsFont.hFontTexture = GL_LoadTexture( "gfx.wad/creditsfont.fnt", NULL, 0, TF_IMAGE, NULL );
	R_GetTextureParms( &fontWidth, NULL, cls.creditsFont.hFontTexture );

	// setup creditsfont
	if( FS_FileExists( "gfx/creditsfont.fnt", false ))
	{
		byte	*buffer;
		size_t	length;
		qfont_t	*src;

		// half-life font with variable chars witdh
		buffer = FS_LoadFile( "gfx/creditsfont.fnt", &length, false );
	
		if( buffer && length >= sizeof( qfont_t ))
		{
			int	i;
	
			src = (qfont_t *)buffer;
			cls.creditsFont.charHeight = clgame.scrInfo.iCharHeight = src->rowheight;

			// build rectangles
			for( i = 0; i < 256; i++ )
			{
				cls.creditsFont.fontRc[i].left = (word)src->fontinfo[i].startoffset % fontWidth;
				cls.creditsFont.fontRc[i].right = cls.creditsFont.fontRc[i].left + src->fontinfo[i].charwidth;
				cls.creditsFont.fontRc[i].top = (word)src->fontinfo[i].startoffset / fontWidth;
				cls.creditsFont.fontRc[i].bottom = cls.creditsFont.fontRc[i].top + src->rowheight;
				cls.creditsFont.charWidths[i] = clgame.scrInfo.charWidths[i] = src->fontinfo[i].charwidth;
			}
			cls.creditsFont.valid = true;
		}
		if( buffer ) Mem_Free( buffer );
	}
}

void SCR_InstallParticlePalette( void )
{
	rgbdata_t	*pic;
	int	i;

	// first check 'palette.lmp' then 'palette.pal'
	pic = FS_LoadImage( "gfx/palette.lmp", NULL, 0 );
	if( !pic ) pic = FS_LoadImage( "gfx/palette.pal", NULL, 0 );

	// NOTE: imagelib required this fakebuffer for loading internal palette
	if( !pic ) pic = FS_LoadImage( "#valve.pal", ((byte *)&i), 768 );

	if( pic )
	{
		for( i = 0; i < 256; i++ )
		{
			clgame.palette[i][0] = pic->palette[i*4+0];
			clgame.palette[i][1] = pic->palette[i*4+1];
			clgame.palette[i][2] = pic->palette[i*4+2];
		}
		FS_FreeImage( pic );
	}
	else
	{
		for( i = 0; i < 256; i++ )
		{
			clgame.palette[i][0] = i;
			clgame.palette[i][1] = i;
			clgame.palette[i][2] = i;
		}
		MsgDev( D_WARN, "CL_InstallParticlePalette: failed. Force to grayscale\n" );
	}
}

void SCR_RegisterTextures( void )
{
	cls.fillImage = GL_LoadTexture( "*white", NULL, 0, TF_IMAGE, NULL ); // used for FillRGBA
	cls.particleImage = GL_LoadTexture( "*particle", NULL, 0, TF_IMAGE, NULL );

	// register gfx.wad images
	cls.pauseIcon = GL_LoadTexture( "gfx.wad/paused.lmp", NULL, 0, TF_IMAGE, NULL );
	if( cl_allow_levelshots->integer )
		cls.loadingBar = GL_LoadTexture( "gfx.wad/lambda.lmp", NULL, 0, TF_IMAGE|TF_LUMINANCE, NULL );
	else cls.loadingBar = GL_LoadTexture( "gfx.wad/lambda.lmp", NULL, 0, TF_IMAGE, NULL ); 
	cls.tileImage = GL_LoadTexture( "gfx.wad/backtile.lmp", NULL, 0, TF_UNCOMPRESSED|TF_NOPICMIP|TF_NOMIPMAP, NULL );
	cls.hChromeSprite = pfnSPR_Load( "sprites/shellchrome.spr" );
}

/*
=================
SCR_SizeUp_f

Keybinding command
=================
*/
void SCR_SizeUp_f( void )
{
	Cvar_SetFloat( "viewsize", min( scr_viewsize->value + 10, 120 ));
}


/*
=================
SCR_SizeDown_f

Keybinding command
=================
*/
void SCR_SizeDown_f( void )
{
	Cvar_SetFloat( "viewsize", max( scr_viewsize->value - 10, 30 ));
}

/*
==================
SCR_VidInit
==================
*/
void SCR_VidInit( void )
{
	memset( &clgame.ds, 0, sizeof( clgame.ds )); // reset a draw state
	memset( &gameui.ds, 0, sizeof( gameui.ds )); // reset a draw state
	memset( &clgame.centerPrint, 0, sizeof( clgame.centerPrint ));

	// update screen sizes for menu
	gameui.globals->scrWidth = scr_width->integer;
	gameui.globals->scrHeight = scr_height->integer;

	SCR_RebuildGammaTable();
	VGui_Startup ();

	clgame.load_sequence++; // now all hud sprites are invalid
	
	// vid_state has changed
	if( gameui.hInstance ) gameui.dllFuncs.pfnVidInit();
	if( clgame.hInstance ) clgame.dllFuncs.pfnVidInit();

	// restart console size
	Con_VidInit ();
}

/*
==================
SCR_Init
==================
*/
void SCR_Init( void )
{
	if( scr_init ) return;

	MsgDev( D_NOTE, "SCR_Init()\n" );
	scr_centertime = Cvar_Get( "scr_centertime", "2.5", 0, "centerprint hold time" );
	cl_levelshot_name = Cvar_Get( "cl_levelshot_name", "*black", 0, "contains path to current levelshot" );
	cl_allow_levelshots = Cvar_Get( "allow_levelshots", "0", CVAR_ARCHIVE, "allow engine to use indivdual levelshots instead of 'loading' image" );
	scr_loading = Cvar_Get( "scr_loading", "0", 0, "loading bar progress" );
	scr_download = Cvar_Get( "scr_download", "0", 0, "downloading bar progress" );
	cl_testlights = Cvar_Get( "cl_testlights", "0", 0, "test dynamic lights" );
	cl_envshot_size = Cvar_Get( "cl_envshot_size", "256", CVAR_ARCHIVE, "envshot size of cube side" );
	scr_dark = Cvar_Get( "v_dark", "0", 0, "starts level from dark screen" );
	scr_viewsize = Cvar_Get( "viewsize", "120", CVAR_ARCHIVE, "screen size" );
	
	// register our commands
	Cmd_AddCommand( "timerefresh", SCR_TimeRefresh_f, "turn quickly and print rendering statistcs" );
	Cmd_AddCommand( "skyname", CL_SetSky_f, "set new skybox by basename" );
	Cmd_AddCommand( "viewpos", SCR_Viewpos_f, "prints current player origin" );
	Cmd_AddCommand( "sizeup", SCR_SizeUp_f, "screen size up to 10 points" );
	Cmd_AddCommand( "sizedown", SCR_SizeDown_f, "screen size down to 10 points" );

	if( !UI_LoadProgs( ))
	{
		Msg( "^1Error: ^7can't initialize gameui.dll\n" ); // there is non fatal for us
		if( !host.developer ) host.developer = 1; // we need console, because menu is missing
	}

	SCR_LoadCreditsFont ();
	SCR_InstallParticlePalette ();
	SCR_RegisterTextures ();
	SCR_InitCinematic();
	CL_InitNetgraph();
	SCR_VidInit();

	if( host.developer && Sys_CheckParm( "-toconsole" ))
		Cbuf_AddText( "toggleconsole\n" );
	else UI_SetActiveMenu( true );

	scr_init = true;
}

void SCR_Shutdown( void )
{
	if( !scr_init ) return;

	MsgDev( D_NOTE, "SCR_Shutdown()\n" );
	Cmd_RemoveCommand( "timerefresh" );
	Cmd_RemoveCommand( "skyname" );
	Cmd_RemoveCommand( "viewpos" );
	UI_SetActiveMenu( false );
	UI_UnloadProgs();

	scr_init = false;
}