/*
Copyright (C) 1996-1997 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 "quakedef.h"

/*
==================
R_InitTextures
==================
*/
void	R_InitTextures (void)
{
	int		x,y, m;
	byte	*dest;

// create a simple checkerboard texture for the default
	r_notexture_mip = Hunk_AllocName (sizeof(texture_t) + 16*16+8*8+4*4+2*2, "notexture");
	
	r_notexture_mip->width = r_notexture_mip->height = 16;
	r_notexture_mip->offsets[0] = sizeof(texture_t);
	r_notexture_mip->offsets[1] = r_notexture_mip->offsets[0] + 16*16;
	r_notexture_mip->offsets[2] = r_notexture_mip->offsets[1] + 8*8;
	r_notexture_mip->offsets[3] = r_notexture_mip->offsets[2] + 4*4;
	
	for (m=0 ; m<4 ; m++)
	{
		dest = (byte *)r_notexture_mip + r_notexture_mip->offsets[m];
		for (y=0 ; y< (16>>m) ; y++)
			for (x=0 ; x< (16>>m) ; x++)
			{
				if (  (y< (8>>m) ) ^ (x< (8>>m) ) )
					*dest++ = 0;
				else
					*dest++ = 0xff;
			}
	}	
}

byte	dottexture[8][8] =
{
	{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},
	{0,0,0,0,0,0,0,0},
	{0,0,0,0,0,0,0,0},
};
void R_InitParticleTexture (void)
{
	int		x,y;
	byte	data[8][8][4];

	//
	// particle texture
	//
	particletexture = texture_extension_number++;
    GL_Bind(particletexture);

	for (x=0 ; x<8 ; x++)
	{
		for (y=0 ; y<8 ; y++)
		{
			data[y][x][0] = 255;
			data[y][x][1] = 255;
			data[y][x][2] = 255;
			data[y][x][3] = dottexture[x][y]*255;
		}
	}
	glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);

	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}

/*
===============
R_Envmap_f

Grab six views for environment mapping tests
===============
*/
void R_Envmap_f (void)
{
	byte	buffer[256*256*4];
	char	name[1024];

	glDrawBuffer  (GL_FRONT);
	glReadBuffer  (GL_FRONT);
	envmap = true;

	r_refdef.vrect.x = 0;
	r_refdef.vrect.y = 0;
	r_refdef.vrect.width = 256;
	r_refdef.vrect.height = 256;

	r_refdef.viewangles[0] = 0;
	r_refdef.viewangles[1] = 0;
	r_refdef.viewangles[2] = 0;
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
	R_RenderView ();
	glReadPixels (0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
	COM_WriteFile ("env0.rgb", buffer, sizeof(buffer));		

	r_refdef.viewangles[1] = 90;
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
	R_RenderView ();
	glReadPixels (0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
	COM_WriteFile ("env1.rgb", buffer, sizeof(buffer));		

	r_refdef.viewangles[1] = 180;
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
	R_RenderView ();
	glReadPixels (0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
	COM_WriteFile ("env2.rgb", buffer, sizeof(buffer));		

	r_refdef.viewangles[1] = 270;
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
	R_RenderView ();
	glReadPixels (0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
	COM_WriteFile ("env3.rgb", buffer, sizeof(buffer));		

	r_refdef.viewangles[0] = -90;
	r_refdef.viewangles[1] = 0;
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
	R_RenderView ();
	glReadPixels (0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
	COM_WriteFile ("env4.rgb", buffer, sizeof(buffer));		

	r_refdef.viewangles[0] = 90;
	r_refdef.viewangles[1] = 0;
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
	R_RenderView ();
	glReadPixels (0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
	COM_WriteFile ("env5.rgb", buffer, sizeof(buffer));		

	envmap = false;
	glDrawBuffer  (GL_BACK);
	glReadBuffer  (GL_BACK);
	GL_EndRendering ();
}

cvar_t r_waterwarp = {"r_waterwarp", "0"};
extern int overbright;

void R_TextSmall (void)	{gl_textdouble.value = 0;}
void R_TextBig (void)	{gl_textdouble.value = 1;}

/*===============
R_Init
===============*/
void R_Init (void)
{	
	extern byte *hunk_base;
	extern cvar_t gl_finish;

	Cmd_AddCommand ("timerefresh", R_TimeRefresh_f);	
	Cmd_AddCommand ("envmap", R_Envmap_f);	
	Cmd_AddCommand ("pointfile", R_ReadPointFile_f);	
	Cmd_AddCommand ("changesky", R_ChangeSkytype);

	Cmd_AddCommand ("textsmall", R_TextSmall);
	Cmd_AddCommand ("textbig", R_TextBig);

	Cvar_RegisterVariable (&r_waterwarp);
	Cvar_RegisterVariable (&r_norefresh);
	Cvar_RegisterVariable (&r_lightmap);
	Cvar_RegisterVariable (&r_fullbright);
	Cvar_RegisterVariable (&r_drawentities);
	Cvar_RegisterVariable (&r_drawviewmodel);
	Cvar_RegisterVariable (&r_drawbrass);
	Cvar_RegisterVariable (&r_drawdecals);
	Cvar_RegisterVariable (&r_drawdecallights);
	Cvar_RegisterVariable (&r_maxdecals);
	Cvar_RegisterVariable (&r_shadows);
	Cvar_RegisterVariable (&r_mirroralpha);
	Cvar_RegisterVariable (&r_wateralpha);
	Cvar_RegisterVariable (&r_wateralpha_dist);
	Cvar_RegisterVariable (&r_waterwave);
	Cvar_RegisterVariable (&r_dynamic);
	Cvar_RegisterVariable (&r_megadynamic);
	Cvar_RegisterVariable (&r_novis);
	Cvar_RegisterVariable (&r_particledensity);
	Cvar_RegisterVariable (&r_particleduration);
	Cvar_RegisterVariable (&r_speeds);
	Cvar_RegisterVariable (&r_hudalpha);
	Cvar_RegisterVariable (&r_turtlespeed);
	Cvar_RegisterVariable (&r_ordermode);

	Cvar_RegisterVariable (&gl_finish);
	Cvar_RegisterVariable (&gl_clear);
	Cvar_RegisterVariable (&gl_texsort);

 	if (gl_mtexable)
		Cvar_SetValue ("gl_texsort", 0.0);

	Cvar_RegisterVariable (&gl_cull);
	Cvar_RegisterVariable (&gl_smoothmodels);
	Cvar_RegisterVariable (&gl_affinemodels);
	Cvar_RegisterVariable (&gl_polyblend);
	Cvar_RegisterVariable (&gl_flashblend);
	Cvar_RegisterVariable (&gl_playermip);
	Cvar_RegisterVariable (&gl_nocolors);

	Cvar_RegisterVariable (&gl_keeptjunctions);
	Cvar_RegisterVariable (&gl_reporttjunctions);

	Cvar_RegisterVariable (&gl_doubleeyes);

	Cvar_RegisterVariable (&gl_fogenable);
	Cvar_RegisterVariable (&gl_fogblue);
	Cvar_RegisterVariable (&gl_fogred);
	Cvar_RegisterVariable (&gl_foggreen);
	Cvar_RegisterVariable (&gl_fogalpha);
	Cvar_RegisterVariable (&gl_fogdensity);
	Cvar_RegisterVariable (&gl_fogstart);
	Cvar_RegisterVariable (&gl_fogend);

	Cvar_RegisterVariable (&gl_skytype);
	Cvar_RegisterVariable (&gl_skybox);
	Cvar_RegisterVariable (&gl_skysize);
	Cvar_RegisterVariable (&r_skyspeed);

	Cvar_RegisterVariable (&r_blur);

	Cvar_RegisterVariable (&gl_overbright);
	Cvar_RegisterVariable (&gl_drawfullbrights);
	
	Cvar_RegisterVariable (&gl_skyblue);
	Cvar_RegisterVariable (&gl_skyred);
	Cvar_RegisterVariable (&gl_skygreen);

	Cvar_RegisterVariable (&worldscale);
	
	R_InitParticles ();
	R_InitParticleTexture ();



#ifdef GLTEST
	Test_Init ();
#endif

	playertextures = texture_extension_number;
	//texture_extension_number += 16;
	texture_extension_number += 256;
}

/*===================
R_TranslatePlayerSkin - Translates a skin texture by the per-player color lookup
===================*/
void R_TranslatePlayerSkin (int playernum)
{
	int		top, bottom;
	byte	translate[256];
	unsigned	translate32[256];
	int		i, j, s;
	model_t	*model;
	aliashdr_t *paliashdr;
	byte	*original;
	unsigned	pixels[512*256], *out;
	unsigned	scaled_width, scaled_height;
	int			inwidth, inheight;
	byte		*inrow;
	unsigned	frac, fracstep;
	extern	byte		**player_8bit_texels_tbl;

	GL_DisableMultitexture();

	top = cl.scores[playernum].colors & 0xf0;
	bottom = (cl.scores[playernum].colors &15)<<4;

	for (i=0 ; i<256 ; i++)
		translate[i] = i;

	for (i=0 ; i<16 ; i++)
	{
		if (top < 128)	// the artists made some backwards ranges.  sigh.
			translate[TOP_RANGE+i] = top+i;
		else
			translate[TOP_RANGE+i] = top+15-i;
				
		if (bottom < 128)
			translate[BOTTOM_RANGE+i] = bottom+i;
		else
			translate[BOTTOM_RANGE+i] = bottom+15-i;
	}

	// locate the original skin pixels
	currententity = &cl_entities[1+playernum];
	model = currententity->model;
	if (!model)
		return;		// player doesn't have a model yet
	if (model->type != mod_alias)
		return; // only translate skins on alias models

	paliashdr = (aliashdr_t *)Mod_Extradata (model);
	s = paliashdr->skinwidth * paliashdr->skinheight;
	if (currententity->skinnum < 0 || currententity->skinnum >= paliashdr->numskins) {
		Con_Printf("(%d): Invalid player skin #%d\n", playernum, currententity->skinnum);
		original = (byte *)paliashdr + paliashdr->texels[0];
	} else
		original = (byte *)paliashdr + paliashdr->texels[currententity->skinnum];
	if (s & 3)
		Sys_Error ("R_TranslateSkin: s&3");

	inwidth = paliashdr->skinwidth;
	inheight = paliashdr->skinheight;

	// because this happens during gameplay, do it fast
	// instead of sending it through gl_upload 8
    GL_Bind(playertextures + playernum);

	scaled_width = gl_max_size.value < 512 ? gl_max_size.value : 512;
	scaled_height = gl_max_size.value < 256 ? gl_max_size.value : 256;

	// allow users to crunch sizes down even more if they want
	scaled_width >>= (int)gl_playermip.value;
	scaled_height >>= (int)gl_playermip.value;

	if (VID_Is8bit()) { // 8bit texture upload
		byte *out2;

		out2 = (byte *)pixels;
		memset(pixels, 0, sizeof(pixels));
		fracstep = inwidth*0x10000/scaled_width;
		for (i=0 ; i<scaled_height ; i++, out2 += scaled_width)
		{
			inrow = original + inwidth*(i*inheight/scaled_height);
			frac = fracstep >> 1;
			for (j=0 ; j<scaled_width ; j+=4)
			{
				out2[j] = translate[inrow[frac>>16]];
				frac += fracstep;
				out2[j+1] = translate[inrow[frac>>16]];
				frac += fracstep;
				out2[j+2] = translate[inrow[frac>>16]];
				frac += fracstep;
				out2[j+3] = translate[inrow[frac>>16]];
				frac += fracstep;
			}
		}

		GL_Upload8_EXT ((byte *)pixels, scaled_width, scaled_height, false, false);
		return;
	}

	for (i=0 ; i<256 ; i++)
		translate32[i] = d_8to24table[translate[i]];

	out = pixels;
	fracstep = inwidth*0x10000/scaled_width;
	for (i=0 ; i<scaled_height ; i++, out += scaled_width)
	{
		inrow = original + inwidth*(i*inheight/scaled_height);
		frac = fracstep >> 1;
		for (j=0 ; j<scaled_width ; j+=4)
		{
			out[j] = translate32[inrow[frac>>16]];
			frac += fracstep;
			out[j+1] = translate32[inrow[frac>>16]];
			frac += fracstep;
			out[j+2] = translate32[inrow[frac>>16]];
			frac += fracstep;
			out[j+3] = translate32[inrow[frac>>16]];
			frac += fracstep;
		}
	}
	glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}

byte			*targa_rgba;
char	*end[7] = {"1", "2", "3", "4", "5", "6", "7"};

/*
===============
R_LoadCrosshair
===============
*/
void R_LoadCrosshair (void)
{
	int		i, tex;
	FILE	*f;
	char	name[64];

	crosshair_tex = texture_extension_number;
	for (i=0 ; i<7 ; i++)
	{
		sprintf (name, "gfx/crosshair%s.tga", end[i]);
		COM_FOpenFile (name, &f);
		if (!f)
		{
			Con_Printf ("Couldn't load %s\n", name);
			continue;
		}
		LoadTGA (f);

		if (i == 6)
			tex = GL_LoadTexture(name, 128, 128, 32, targa_rgba, 1, 1);
		else
			tex = GL_LoadTexture(name, 64, 64, 32, targa_rgba, 1, 1);
		free (targa_rgba);
	}
	
}

extern int overbright;
extern float over_dim;
extern int solidskytexture;
extern int alphaskytexture;
/*===============
R_NewMap
===============*/
void R_NewMap (void)
{
	int		i;
	char	string[128];

	Cbuf_AddText(va("exec maps/cfgs/%s.cfg\n", sv.name));
	Cbuf_Execute();

#ifdef GLQUAKE
	overbright = gl_overbright.value;
	if (overbright == 0)
		over_dim = 1;
	else
		over_dim = 0.5 / overbright;
	if (gl_skybox.value)
		R_LoadSkys (gl_skytype.string);
#endif

	for (i=0 ; i<256 ; i++)
		d_lightstylevalue[i] = 264;		// normal light value

	memset (&r_worldentity, 0, sizeof(r_worldentity));
	r_worldentity.model = cl.worldmodel;

	// clear out efrags in case the level hasn't been reloaded
	// FIXME: is this one short?
	for (i=0 ; i<cl.worldmodel->numleafs ; i++)
		cl.worldmodel->leafs[i].efrags = NULL;
		 	
	r_viewleaf = NULL;
	R_ClearParticles ();
	GL_BuildLightmaps ();

	// identify sky texture
	skytexturenum = -1;
	mirrortexturenum = -1;
	for (i=0 ; i<cl.worldmodel->numtextures ; i++)
	{
		if (!cl.worldmodel->textures[i])
			continue;
		if (!Q_strncmp(cl.worldmodel->textures[i]->name,"sky",3) )
			skytexturenum = i;
		//if (!Q_strncmp(cl.worldmodel->textures[i]->name,"t",1) )
		//	mirrortexturenum = i;
 		cl.worldmodel->textures[i]->texturechain = NULL;
	}
}


/*
====================
R_TimeRefresh_f

For program optimization
====================
*/
void R_TimeRefresh_f (void)
{
	int			i;
	float		start, stop, time;
	int			startangle;
	vrect_t		vr;

	glDrawBuffer  (GL_FRONT);
	glFinish ();

	start = Sys_FloatTime ();
	for (i=0 ; i<128 ; i++)
	{
		r_refdef.viewangles[1] = i/128.0*360.0;
		R_RenderView ();
	}

	glFinish ();
	stop = Sys_FloatTime ();
	time = stop-start;
	Con_Printf ("%f seconds (%f fps)\n", time, 128/time);

	glDrawBuffer  (GL_BACK);
	GL_EndRendering ();
}

void D_FlushCaches (void)
{
}

