/*
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.

*/
#include <3ds.h>
#include <GL/picaGL.h>
#include "quakedef.h"

unsigned	d_8to24table[256];
unsigned char d_15to8table[65536];

int		texture_mode = GL_LINEAR;

int		texture_extension_number = 1;

float	gldepthmin, gldepthmax;

cvar_t	gl_ztrick = {"gl_ztrick","1"};

const char *gl_vendor;
const char *gl_renderer;
const char *gl_version;
const char *gl_extensions;

static float vid_gamma = 1.0;

qboolean is8bit = false;
qboolean isPermedia = true;
qboolean gl_mtexable = false;

/*
===============
GL_Init
===============
*/
void GL_Init (void)
{
	pglInit();

	gl_vendor = glGetString (GL_VENDOR);
	gl_renderer = glGetString (GL_RENDERER);
	gl_version = glGetString (GL_VERSION);
	gl_extensions = glGetString (GL_EXTENSIONS);

	glClearColor (1,0,0,0);
	glCullFace(GL_FRONT);
	glEnable(GL_TEXTURE_2D);

	glEnable(GL_ALPHA_TEST);
	glAlphaFunc(GL_GREATER, 0.666);

	glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
	glShadeModel (GL_FLAT);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

	glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

	glClear(GL_COLOR_BUFFER_BIT);
}


void GL_BeginRendering (int *x, int *y, int *width, int *height)
{
	*x = *y = 0;
	*width = 400;
	*height = 240;
}


void GL_EndRendering (void)
{
	glFinish();
	pglSwapBuffers(); 
}

void	VID_SetPalette (unsigned char *palette)
{
	byte	*pal;
	unsigned r,g,b;
	unsigned v;
	int     r1,g1,b1;
	int		j,k,l,m;
	unsigned short i;
	unsigned	*table;
	FILE *f;
	char s[255];
	int dist, bestdist;

//
// 8 8 8 encoding
//
	pal = palette;
	table = d_8to24table;
	for (i=0 ; i<256 ; i++)
	{
		r = pal[0];
		g = pal[1];
		b = pal[2];
		pal += 3;
		
		v = (255<<24) + (r<<0) + (g<<8) + (b<<16);
		*table++ = v;
	}
	d_8to24table[255] &= 0xffffff;	// 255 is transparent

	// JACK: 3D distance calcs - k is last closest, l is the distance.
	for (i=0; i < (1<<15); i++) {
		/* Maps
		000000000000000
		000000000011111 = Red  = 0x1F
		000001111100000 = Blue = 0x03E0
		111110000000000 = Grn  = 0x7C00
		*/
		r = ((i & 0x1F) << 3)+4;
		g = ((i & 0x03E0) >> 2)+4;
		b = ((i & 0x7C00) >> 7)+4;
		pal = (unsigned char *)d_8to24table;
		for (v=0,k=0,bestdist=10000*10000; v<256; v++,pal+=4) {
			r1 = (int)r - (int)pal[0];
			g1 = (int)g - (int)pal[1];
			b1 = (int)b - (int)pal[2];
			dist = (r1*r1)+(g1*g1)+(b1*b1);
			if (dist < bestdist) {
				k=v;
				bestdist = dist;
			}
		}
		d_15to8table[i]=k;
	}
}

void	VID_ShiftPalette (unsigned char *palette)
{
	//VID_SetPalette(palette);
}

qboolean VID_Is8bit(void)
{
	return is8bit;
}

static void Check_Gamma (unsigned char *pal)
{
	float	f, inf;
	unsigned char	palette[768];
	int		i;

	if ((i = COM_CheckParm("-gamma")) == 0)
		vid_gamma = 0.7;
	else
		vid_gamma = Q_atof(com_argv[i+1]);

	for (i=0 ; i<768 ; i++)
	{
		f = pow ( (pal[i]+1)/256.0 , vid_gamma );
		inf = f*255 + 0.5;
		if (inf < 0)
			inf = 0;
		if (inf > 255)
			inf = 255;
		palette[i] = inf;
	}

	memcpy (pal, palette, sizeof(palette));

	Build_Gamma_Table ();		//Diabolickal HLBSP
}

void	VID_Init (unsigned char *palette)
{
	int i;
	char	gldir[MAX_OSPATH];
	int width = 400;
	int height = 240;

	Cvar_RegisterVariable (&gl_ztrick);
	
	vid.maxwarpwidth = width;
	vid.maxwarpheight = height;
	vid.colormap = host_colormap;
	vid.fullbright = 256 - LittleLong (*((int *)vid.colormap + 2048));

	vid.conwidth = 320;

	vid.conwidth &= 0xfff8; // make it a multiple of eight

	if (vid.conwidth < 320)
		vid.conwidth = 320;

	// pick a conheight that matches with correct aspect
	vid.conheight = vid.conwidth*3 / 4;

	if ((i = COM_CheckParm("-conheight")) != 0)
		vid.conheight = Q_atoi(com_argv[i+1]);
	if (vid.conheight < 200)
		vid.conheight = 200;

	if (vid.conheight > height)
		vid.conheight = height;
	if (vid.conwidth > width)
		vid.conwidth = width;

	vid.width = 400;
	vid.height = 240;

	vid.aspect = ((float)vid.height / (float)vid.width) *
				(320.0 / 240.0);
	vid.numpages = 2;

	GL_Init();

	sprintf (gldir, "%s/glquake", com_gamedir);
	Sys_mkdir (gldir);

	Check_Gamma(palette);
	VID_SetPalette(palette);

	Con_SafePrintf ("Video mode %dx%d initialized.\n", width, height);

	vid.recalc_refdef = 1;				// force a surface cache flush
}

void	VID_Shutdown (void)
{
}

void	VID_Update (vrect_t *rects)
{
}