/*
Copyright (C) 1997-2001 Id Software, 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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// r_misc.c

#include "gl_local.h"

/*
==================
R_InitParticleTexture
==================
*/
byte	dottexture[8][8] =
{
	{0,0,0,0,0,0,0,0},
	{0,0,1,1,0,0,0,0},
	{0,1,1,1,1,0,0,0},
	{0,1,1,1,1,0,0,0},
	{0,0,1,1,0,0,0,0},
	{0,0,0,0,0,0,0,0},
	{0,0,0,0,0,0,0,0},
	{0,0,0,0,0,0,0,0},
};

int ScaleToPower2 (int number)
{
	int powers_of_two[] = {8,16,32,64,128,256,512, 0};
	int i;

	for (i=0;powers_of_two[i];i++)
	{
		if (number<=powers_of_two[i])
			return powers_of_two[i];
	}

	return 512;
}

void LoadJPG ( char *name, byte **pic, int *width, int *height );
void LoadTGA ( char *name, byte **pic, int *width, int *height );

//faster if scaled i guess :p
image_t *LoadPartImg (char *name, float scale)
{
	byte	*pic;
	int width, height, sHeight, sWidth, len=strlen(name);
	void (*PicLoad) ( char *name, byte **pic, int *width, int *height );

	if (!strcmp(name+len-4, ".jpg"))
		PicLoad = LoadJPG;
	else if (!strcmp(name+len-4, ".tga"))
		PicLoad = LoadTGA;
	else if (!strcmp(name+len-4, ".pcx")) //just in case someone wants old style pics :/
		PicLoad = LoadPCX;

	PicLoad (name, &pic, &width, &height);

	if (!pic)
	{
		ri.Sys_Error (ERR_FATAL, "Missing Particle Picture: %s", name);
	}

	sWidth = ScaleToPower2(width*scale);
	sHeight = ScaleToPower2(height*scale);
	GL_ResampleTexture ((unsigned *)pic, width, height, (unsigned *)pic, 
			    sWidth, sHeight);



	return GL_LoadPic (name, pic, sWidth, sHeight, it_part, 32);

}

float	partscale;

void SetParticlePicture (int num, char *name)
{
	r_particletextures[num] = LoadPartImg(name, partscale);
}

void R_InitParticleTexture (void)
{

	int		x,y;
	byte	data[8][8][4];

	partscale = (float)((int)gl_partscale->value)*0.01;
	if (partscale>1)
		partscale=1;
	else if (partscale<0.01)
		partscale=0.01;

	r_particlebeam = LoadPartImg("particles/beam.jpg", partscale);

	for (x=0 ; x<PARTICLE_TYPES ; x++)
		r_particletextures[x] = NULL;
	
	ri.SetParticlePics();
	
	//
	// also use this for bad textures, but without alpha
	//
	for (x=0 ; x<8 ; x++)
	{
		for (y=0 ; y<8 ; y++)
		{
			data[y][x][0] = dottexture[x&3][y&3]*255;
			data[y][x][1] = dottexture[x&3][y&3]*255;
			data[y][x][2] = dottexture[x&3][y&3]*255;
			data[y][x][3] = 255;
		}
	}
	r_notexture = GL_LoadPic ("***r_notexture***", (byte *)data, 8, 8, it_wall, 32);
}


/* 
============================================================================== 
 
						SCREEN SHOTS 
 
============================================================================== 
*/ 

typedef struct _TargaHeader {
	unsigned char 	id_length, colormap_type, image_type;
	unsigned short	colormap_index, colormap_length;
	unsigned char	colormap_size;
	unsigned short	x_origin, y_origin, width, height;
	unsigned char	pixel_size, attributes;
} TargaHeader;


/* 
================== 
GL_ScreenShot_f
================== 
*/  
void GL_ScreenShot_f (void) 
{
	byte		*buffer;
	char		picname[80]; 
	char		checkname[MAX_OSPATH];
	int			i, c, temp;
	FILE		*f;

	// create the scrnshots directory if it doesn't exist
	Com_sprintf (checkname, sizeof(checkname), "%s/scrnshot", ri.FS_Gamedir());
	Sys_Mkdir (checkname);

// 
// find a file name to save it to 
// 
	strcpy(picname,"quake00.tga");

	for (i=0 ; i<=99 ; i++) 
	{ 
		picname[5] = i/10 + '0'; 
		picname[6] = i%10 + '0'; 
		Com_sprintf (checkname, sizeof(checkname), "%s/scrnshot/%s", ri.FS_Gamedir(), picname);
		f = fopen (checkname, "rb");
		if (!f)
			break;	// file doesn't exist
		fclose (f);
	} 
	if (i==100) 
	{
		ri.Con_Printf (PRINT_ALL, "SCR_ScreenShot_f: Couldn't create a file\n"); 
		return;
 	}


	buffer = malloc(vid.width*vid.height*3 + 18);
	memset (buffer, 0, 18);
	buffer[2] = 2;		// uncompressed type
	buffer[12] = vid.width&255;
	buffer[13] = vid.width>>8;
	buffer[14] = vid.height&255;
	buffer[15] = vid.height>>8;
	buffer[16] = 24;	// pixel size

	qglReadPixels (0, 0, vid.width, vid.height, GL_RGB, GL_UNSIGNED_BYTE, buffer+18 ); 

	// swap rgb to bgr
	c = 18+vid.width*vid.height*3;
	for (i=18 ; i<c ; i+=3)
	{
		temp = buffer[i];
		buffer[i] = buffer[i+2];
		buffer[i+2] = temp;
	}

	f = fopen (checkname, "wb");
	fwrite (buffer, 1, c, f);
	fclose (f);

	free (buffer);
	ri.Con_Printf (PRINT_ALL, "Wrote %s\n", picname);
} 

/*
** GL_Strings_f
*/
void GL_Strings_f( void )
{
	ri.Con_Printf (PRINT_ALL, "GL_VENDOR: %s\n", gl_config.vendor_string );
	ri.Con_Printf (PRINT_ALL, "GL_RENDERER: %s\n", gl_config.renderer_string );
	ri.Con_Printf (PRINT_ALL, "GL_VERSION: %s\n", gl_config.version_string );
	ri.Con_Printf (PRINT_ALL, "GL_EXTENSIONS: %s\n", gl_config.extensions_string );
}

/*
** GL_SetDefaultState
*/
void GL_SetDefaultState( void )
{
	qglClearColor (1,0, 0.5 , 0.5);
	qglCullFace(GL_FRONT);
	qglEnable(GL_TEXTURE_2D);

	qglEnable(GL_ALPHA_TEST);
	qglAlphaFunc(GL_GREATER, 0.666);

	qglDisable (GL_DEPTH_TEST);
	qglDisable (GL_CULL_FACE);
	qglDisable (GL_BLEND);

	qglColor4f (1,1,1,1);

	qglPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
	qglShadeModel (GL_FLAT);

	GL_TextureMode( gl_texturemode->string );
	GL_TextureAlphaMode( gl_texturealphamode->string );
	GL_TextureSolidMode( gl_texturesolidmode->string );

	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);

	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

	qglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	GL_TexEnv( GL_REPLACE );

	GL_UpdateSwapInterval();
}

void GL_UpdateSwapInterval( void )
{
	if ( gl_swapinterval->modified )
	{
		gl_swapinterval->modified = false;

		if ( !gl_state.stereo_enabled ) 
		{
#ifdef _WIN32
			if ( qwglSwapIntervalEXT )
				qwglSwapIntervalEXT( gl_swapinterval->value );
#endif
		}
	}
}