/*
	gl_rmisc.c

	(description)

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#include "cmd.h"
#include "console.h"
#include "cvar.h"
#include "glquake.h"
#include "r_dynamic.h"
#include "skin.h"
#include "sys.h"
#include "vid.h"

qboolean VID_Is8bit (void);
void R_InitBubble (void);

cvar_t	*gl_fires;
cvar_t	*r_netgraph_alpha;
cvar_t	*r_netgraph_box;

extern cvar_t	*r_netgraph;
extern cvar_t	*gl_lerp_anim;

qboolean	allowskybox;				// allow skyboxes?  --KB

/*
==================
R_Textures_Init
==================
*/
void
R_Textures_Init (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;
			}
		}
	}
}

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

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

	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 ();
}

/*
   R_LoadSky_f
*/
void
R_LoadSky_f (void)
{
	if (Cmd_Argc () != 2) {
		Con_Printf ("loadsky <name> : load a skybox\n");
		return;
	}

	R_LoadSkys (Cmd_Argv (1));
}


/*
===============
R_Init
===============
*/
void
R_Init (void)
{
	allowskybox = false;				// server will decide if this is
										// allowed  --KB

	Cmd_AddCommand ("timerefresh", R_TimeRefresh_f);
	Cmd_AddCommand ("envmap", R_Envmap_f);
	Cmd_AddCommand ("pointfile", R_ReadPointFile_f);
	Cmd_AddCommand ("loadsky", R_LoadSky_f);

	R_InitBubble ();

	R_InitParticles ();

	netgraphtexture = texture_extension_number;
	texture_extension_number++;

	playertextures = texture_extension_number;
	texture_extension_number += MAX_CLIENTS;
}

void
R_Init_Cvars (void)
{
	r_norefresh = Cvar_Get ("r_norefresh", "0", CVAR_NONE, "Set to 1 to disable display refresh");
	r_drawentities = Cvar_Get ("r_drawentities", "1", CVAR_NONE, "Toggles drawing of entities (almost everything but the world)");
	r_drawviewmodel = Cvar_Get ("r_drawviewmodel", "1", CVAR_ARCHIVE, "Toggles drawing of view models (your weapons)");
	r_shadows = Cvar_Get ("r_shadows", "0", CVAR_ARCHIVE, "Set to 1 to enable shadows for entities");
	r_wateralpha = Cvar_Get ("r_wateralpha", "1", CVAR_NONE, "Determine opacity of liquids. 1 = solid, 0 = transparent, otherwise translucent.");
	/* FIXME what does r_waterripple use for units? */
	r_waterripple = Cvar_Get ("r_waterripple", "0", CVAR_NONE, "Set to make liquids ripple, a good setting is 5");
	r_dynamic = Cvar_Get ("r_dynamic", "1", CVAR_NONE, "Set to 0 to disable lightmap changes");
	r_novis = Cvar_Get ("r_novis", "0", CVAR_NONE, "Set to 1 to enable runtime visibility checking (SLOW)");
	r_speeds = Cvar_Get ("r_speeds", "0", CVAR_NONE, "Display drawing time and statistics of what is being viewed");

	r_netgraph = Cvar_Get ("r_netgraph", "0", CVAR_ARCHIVE, "Graph network stats");
	r_netgraph_alpha = Cvar_Get ("r_netgraph_alpha", "0.5", CVAR_ARCHIVE, "Net graph translucency");
	r_netgraph_box = Cvar_Get ("r_netgraph_box", "1", CVAR_ARCHIVE, "Draw box around net graph");

	r_skyname = Cvar_Get ("r_skyname", "none", CVAR_NONE, "name of the current skybox");

	gl_affinemodels = Cvar_Get ("gl_affinemodels", "0", CVAR_ARCHIVE, "Makes texture rendering quality better if set to 1");
	gl_clear = Cvar_Get ("gl_clear", "0", CVAR_NONE, "Set to 1 to make background black. Useful for removing HOM effect");
	gl_cull = Cvar_Get ("gl_cull", "1", CVAR_ARCHIVE, "If set to 1, does not render things that do not need to be");
	gl_fb_bmodels = Cvar_Get ("gl_fb_bmodels", "1", CVAR_ARCHIVE, "Toggles fullbright color support for bmodels");
	gl_fb_models = Cvar_Get ("gl_fb_models", "1", CVAR_ARCHIVE, "Toggles fullbright color support for models");
	gl_fires = Cvar_Get ("gl_fires", "0", CVAR_ARCHIVE, "Toggles lavaball and rocket fireballs");
	gl_flashblend = Cvar_Get ("gl_flashblend", "0", CVAR_ARCHIVE, "Set to 1 to use a type of lighting faster on GL");
	gl_keeptjunctions = Cvar_Get ("gl_keeptjunctions", "1", CVAR_ARCHIVE, "Set to 0 to turn off colinear vertexes upon level load");
	gl_lerp_anim = Cvar_Get ("gl_lerp_anim", "1", CVAR_ARCHIVE, "Toggles model animation interpolation");
	gl_multitexture = Cvar_Get ("gl_multitexture", "0", CVAR_ARCHIVE, "Use multitexture when available");
	gl_nocolors = Cvar_Get ("gl_nocolors", "0", CVAR_NONE, "Set to 1, turns off all player colors");
	gl_particles = Cvar_Get ("gl_particles", "1", CVAR_ARCHIVE, "whether or not to draw particles");
	gl_playermip = Cvar_Get ("gl_playermip", "0", CVAR_NONE, "Detail of player skins. 0 best, 4 worst.");
	gl_sky_clip = Cvar_Get ("gl_sky_clip", "0", CVAR_ARCHIVE, "controls whether sky is drawn first (0) or later (1)");
	gl_sky_divide = Cvar_Get ("gl_sky_divide", "1", CVAR_ARCHIVE, "subdivide sky polys");
	gl_skymultipass = Cvar_Get ("gl_skymultipass", "1", CVAR_ARCHIVE, "controls whether the skydome is single or double pass");
	gl_smooth = Cvar_Get ("gl_smooth", "1", CVAR_ARCHIVE, "Smooth lighting on models");
	gl_smoothdlights = Cvar_Get ("gl_smoothdlights", "1", CVAR_ARCHIVE, "Smooth dynamic lights");
}

/*
===============
R_TranslatePlayerSkin

Translates a skin texture by the per-player color lookup
===============
*/
void
R_TranslatePlayerSkin (int playernum)
{
	int         top, bottom;
	byte        translate[256];
	unsigned int translate32[256];
	int         i, j;
	byte       *original;
	unsigned int pixels[512 * 256], *out;
	unsigned int scaled_width, scaled_height;
	int         inwidth, inheight;
	int         tinwidth, tinheight;
	byte       *inrow;
	unsigned int frac, fracstep;
	player_info_t *player;
	extern byte player_8bit_texels[320 * 200];
	char        s[512];

	player = &cl.players[playernum];
	if (!player->name[0])
		return;

	strcpy (s, Info_ValueForKey (player->userinfo, "skin"));
	COM_StripExtension (s, s);
	if (player->skin && !stricmp (s, player->skin->name))
		player->skin = NULL;

	if (player->_topcolor != player->topcolor ||
		player->_bottomcolor != player->bottomcolor || !player->skin) {
		player->_topcolor = player->topcolor;
		player->_bottomcolor = player->bottomcolor;

		top = player->topcolor;
		bottom = player->bottomcolor;
		top = (top < 0) ? 0 : ((top > 13) ? 13 : top);
		bottom = (bottom < 0) ? 0 : ((bottom > 13) ? 13 : bottom);
		top *= 16;
		bottom *= 16;

		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
		tinwidth = 296;		// real model width
		tinheight = 194;	// real model height

		if (!player->skin)
			Skin_Find (player);
		if ((original = Skin_Cache (player->skin)) != NULL) {
			// skin data width
			inwidth = 320;
			inheight = 200;
		} else {
			original = player_8bit_texels;
			inwidth = 296;
			inheight = 194;
		}

		// because this happens during gameplay, do it fast
		// instead of sending it through GL_Upload8()
		glBindTexture (GL_TEXTURE_2D, playertextures + playernum);

		// FIXME deek: This 512x256 limit sucks!
		scaled_width = min (gl_max_size->int_val, 512);
		scaled_height = min (gl_max_size->int_val, 256);

		// allow users to crunch sizes down even more if they want
		scaled_width >>= gl_playermip->int_val;
		scaled_height >>= gl_playermip->int_val;

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

			out2 = (byte *) pixels;
			memset (pixels, 0, sizeof (pixels));
			fracstep = tinwidth * 0x10000 / scaled_width;
			for (i = 0; i < scaled_height; i++, out2 += scaled_width) {
				inrow = original + inwidth * (i * tinheight / 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;
		memset (pixels, 0, sizeof (pixels));
		fracstep = tinwidth * 0x10000 / scaled_width;
		for (i = 0; i < scaled_height; i++, out += scaled_width) {
			inrow = original + inwidth * (i * tinheight / 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);

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

/*
===============
R_NewMap
===============
*/
void
R_NewMap (void)
{
	int         i;
	cvar_t     *r_skyname;

	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;
	for (i = 0; i < cl.worldmodel->numtextures; i++) {
		if (!cl.worldmodel->textures[i])
			continue;
		if (!strncmp (cl.worldmodel->textures[i]->name, "sky", 3))
			skytexturenum = i;
		cl.worldmodel->textures[i]->texturechain = NULL;
	}
	r_skyname = Cvar_FindVar ("r_skyname");
	if (r_skyname != NULL)
		R_LoadSkys (r_skyname->string);
	else
		R_LoadSkys ("none");
}


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

For program optimization
====================
*/
// LordHavoc: improved appearance and accuracy of timerefresh
void
R_TimeRefresh_f (void)
{
	int         i;
	double      start, stop, time;

//  glDrawBuffer  (GL_FRONT);
	glFinish ();
	GL_EndRendering ();

	start = Sys_DoubleTime ();
	for (i = 0; i < 128; i++) {
		GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
		r_refdef.viewangles[1] = i / 128.0 * 360.0;
		R_RenderView ();
		glFinish ();
		GL_EndRendering ();
	}

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

//  glDrawBuffer  (GL_BACK);
//  GL_EndRendering ();
	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);
}

void
D_FlushCaches (void)
{
}