/*
	draw.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 "draw.h"
#include "QF/vid.h"
#include "QF/zone.h"
#include "QF/sys.h"
#include "QF/quakefs.h"
#include "d_iface.h"
#include "QF/sound.h"

typedef struct {
	vrect_t     rect;
	int         width;
	int         height;
	byte       *ptexbytes;
	int         rowbytes;
} rectdesc_t;

static rectdesc_t r_rectdesc;

byte       *draw_chars;					// 8*8 graphic characters
qpic_t     *draw_disc;
qpic_t     *draw_backtile;

//=============================================================================
/* Support Routines */

typedef struct cachepic_s {
	char        name[MAX_QPATH];
	cache_user_t cache;
} cachepic_t;

#define	MAX_CACHED_PICS		128
cachepic_t  menu_cachepics[MAX_CACHED_PICS];
int         menu_numcachepics;


qpic_t     *
Draw_PicFromWad (char *name)
{
	return W_GetLumpName (name);
}

/*
================
Draw_CachePic
================
*/
qpic_t     *
Draw_CachePic (char *path)
{
	cachepic_t *pic;
	int         i;
	qpic_t     *dat;

	for (pic = menu_cachepics, i = 0; i < menu_numcachepics; pic++, i++)
		if (!strcmp (path, pic->name))
			break;

	if (i == menu_numcachepics) {
		if (menu_numcachepics == MAX_CACHED_PICS)
			Sys_Error ("menu_numcachepics == MAX_CACHED_PICS");
		menu_numcachepics++;
		strcpy (pic->name, path);
	}

	dat = Cache_Check (&pic->cache);

	if (dat)
		return dat;

//
// load the pic from disk
//
	COM_LoadCacheFile (path, &pic->cache);

	dat = (qpic_t *) pic->cache.data;
	if (!dat) {
		Sys_Error ("Draw_CachePic: failed to load %s", path);
	}

	SwapPic (dat);

	return dat;
}



/*
===============
Draw_Init
===============
*/
void
Draw_Init (void)
{
	draw_chars = W_GetLumpName ("conchars");
	draw_disc = W_GetLumpName ("disc");
	draw_backtile = W_GetLumpName ("backtile");

	r_rectdesc.width = draw_backtile->width;
	r_rectdesc.height = draw_backtile->height;
	r_rectdesc.ptexbytes = draw_backtile->data;
	r_rectdesc.rowbytes = draw_backtile->width;
}



/*
================
Draw_Character8

Draws one 8*8 graphics character with 0 being transparent.
It can be clipped to the top of the screen to allow the console to be
smoothly scrolled off.
================
*/
void
Draw_Character8 (int x, int y, int num)
{
	byte       *dest;
	byte       *source;
	unsigned short *pusdest;
	int         drawline;
	int         row, col;

	num &= 255;

	if (y <= -8)
		return;							// totally off screen

#ifdef PARANOID
	if (y > vid.height - 8 || x < 0 || x > vid.width - 8)
		Sys_Error ("Con_DrawCharacter: (%i, %i)", x, y);
	if (num < 0 || num > 255)
		Sys_Error ("Con_DrawCharacter: char %i", num);
#endif

	row = num >> 4;
	col = num & 15;
	source = draw_chars + (row << 10) + (col << 3);

	if (y < 0) {						// clipped
		drawline = 8 + y;
		source -= 128 * y;
		y = 0;
	} else
		drawline = 8;


	if (r_pixbytes == 1) {
		dest = vid.conbuffer + y * vid.conrowbytes + x;

		while (drawline--) {
			if (source[0])
				dest[0] = source[0];
			if (source[1])
				dest[1] = source[1];
			if (source[2])
				dest[2] = source[2];
			if (source[3])
				dest[3] = source[3];
			if (source[4])
				dest[4] = source[4];
			if (source[5])
				dest[5] = source[5];
			if (source[6])
				dest[6] = source[6];
			if (source[7])
				dest[7] = source[7];
			source += 128;
			dest += vid.conrowbytes;
		}
	} else {
		// FIXME: pre-expand to native format?
		pusdest = (unsigned short *)
			((byte *) vid.conbuffer + y * vid.conrowbytes + (x << 1));

		while (drawline--) {
			if (source[0])
				pusdest[0] = d_8to16table[source[0]];
			if (source[1])
				pusdest[1] = d_8to16table[source[1]];
			if (source[2])
				pusdest[2] = d_8to16table[source[2]];
			if (source[3])
				pusdest[3] = d_8to16table[source[3]];
			if (source[4])
				pusdest[4] = d_8to16table[source[4]];
			if (source[5])
				pusdest[5] = d_8to16table[source[5]];
			if (source[6])
				pusdest[6] = d_8to16table[source[6]];
			if (source[7])
				pusdest[7] = d_8to16table[source[7]];

			source += 128;
			pusdest += (vid.conrowbytes >> 1);
		}
	}
}

/*
================
Draw_String8
================
*/
void
Draw_String8 (int x, int y, char *str)
{
	while (*str) {
		Draw_Character8 (x, y, *str);
		str++;
		x += 8;
	}
}

/*
================
Draw_DebugChar

Draws a single character directly to the upper right corner of the screen.
This is for debugging lockups by drawing different chars in different parts
of the code.
================
*/
void
Draw_DebugChar (char num)
{
	byte       *dest;
	byte       *source;
	int         drawline;
	extern byte *draw_chars;
	int         row, col;

	if (!vid.direct)
		return;							// don't have direct FB access, so no 
										// 
	// 
	// debugchars...

	drawline = 8;

	row = num >> 4;
	col = num & 15;
	source = draw_chars + (row << 10) + (col << 3);

	dest = vid.direct + 312;

	while (drawline--) {
		dest[0] = source[0];
		dest[1] = source[1];
		dest[2] = source[2];
		dest[3] = source[3];
		dest[4] = source[4];
		dest[5] = source[5];
		dest[6] = source[6];
		dest[7] = source[7];
		source += 128;
		dest += 320;
	}
}

/*
=============
Draw_Pic
=============
*/
void
Draw_Pic (int x, int y, qpic_t *pic)
{
	byte       *dest, *source;
	unsigned short *pusdest;
	int         v, u;

	if ((x < 0) ||
		(x + pic->width > vid.width) ||
		(y < 0) || (y + pic->height > vid.height)) {
		Sys_Error ("Draw_Pic: bad coordinates");
	}

	source = pic->data;

	if (r_pixbytes == 1) {
		dest = vid.buffer + y * vid.rowbytes + x;

		for (v = 0; v < pic->height; v++) {
			memcpy (dest, source, pic->width);
			dest += vid.rowbytes;
			source += pic->width;
		}
	} else {
		// FIXME: pretranslate at load time?
		pusdest = (unsigned short *) vid.buffer + y * (vid.rowbytes >> 1) + x;

		for (v = 0; v < pic->height; v++) {
			for (u = 0; u < pic->width; u++) {
				pusdest[u] = d_8to16table[source[u]];
			}

			pusdest += vid.rowbytes >> 1;
			source += pic->width;
		}
	}
}


/*
=============
Draw_SubPic
=============
*/
void
Draw_SubPic (int x, int y, qpic_t *pic, int srcx, int srcy, int width,
			 int height)
{
	byte       *dest, *source;
	unsigned short *pusdest;
	int         v, u;

	if ((x < 0) ||
		(x + width > vid.width) || (y < 0) || (y + height > vid.height)) {
		Sys_Error ("Draw_SubPic: bad coordinates");
	}

	source = pic->data + srcy * pic->width + srcx;

	if (r_pixbytes == 1) {
		dest = vid.buffer + y * vid.rowbytes + x;

		for (v = 0; v < height; v++) {
			memcpy (dest, source, width);
			dest += vid.rowbytes;
			source += pic->width;
		}
	} else {
		// FIXME: pretranslate at load time?
		pusdest = (unsigned short *) vid.buffer + y * (vid.rowbytes >> 1) + x;

		for (v = 0; v < height; v++) {
			for (u = srcx; u < (srcx + width); u++) {
				pusdest[u] = d_8to16table[source[u]];
			}

			pusdest += vid.rowbytes >> 1;
			source += pic->width;
		}
	}
}


/*
=============
Draw_TransPic
=============
*/
void
Draw_TransPic (int x, int y, qpic_t *pic)
{
	byte       *dest, *source, tbyte;
	unsigned short *pusdest;
	int         v, u;

	if (x < 0 || (unsigned) (x + pic->width) > vid.width || y < 0 ||
		(unsigned) (y + pic->height) > vid.height) {
		Sys_Error ("Draw_TransPic: bad coordinates");
	}

	source = pic->data;

	if (r_pixbytes == 1) {
		dest = vid.buffer + y * vid.rowbytes + x;

		if (pic->width & 7) {			// general
			for (v = 0; v < pic->height; v++) {
				for (u = 0; u < pic->width; u++)
					if ((tbyte = source[u]) != TRANSPARENT_COLOR)
						dest[u] = tbyte;

				dest += vid.rowbytes;
				source += pic->width;
			}
		} else {						// unwound
			for (v = 0; v < pic->height; v++) {
				for (u = 0; u < pic->width; u += 8) {
					if ((tbyte = source[u]) != TRANSPARENT_COLOR)
						dest[u] = tbyte;
					if ((tbyte = source[u + 1]) != TRANSPARENT_COLOR)
						dest[u + 1] = tbyte;
					if ((tbyte = source[u + 2]) != TRANSPARENT_COLOR)
						dest[u + 2] = tbyte;
					if ((tbyte = source[u + 3]) != TRANSPARENT_COLOR)
						dest[u + 3] = tbyte;
					if ((tbyte = source[u + 4]) != TRANSPARENT_COLOR)
						dest[u + 4] = tbyte;
					if ((tbyte = source[u + 5]) != TRANSPARENT_COLOR)
						dest[u + 5] = tbyte;
					if ((tbyte = source[u + 6]) != TRANSPARENT_COLOR)
						dest[u + 6] = tbyte;
					if ((tbyte = source[u + 7]) != TRANSPARENT_COLOR)
						dest[u + 7] = tbyte;
				}
				dest += vid.rowbytes;
				source += pic->width;
			}
		}
	} else {
		// FIXME: pretranslate at load time?
		pusdest = (unsigned short *) vid.buffer + y * (vid.rowbytes >> 1) + x;

		for (v = 0; v < pic->height; v++) {
			for (u = 0; u < pic->width; u++) {
				tbyte = source[u];

				if (tbyte != TRANSPARENT_COLOR) {
					pusdest[u] = d_8to16table[tbyte];
				}
			}

			pusdest += vid.rowbytes >> 1;
			source += pic->width;
		}
	}
}


/*
=============
Draw_TransPicTranslate
=============
*/
void
Draw_TransPicTranslate (int x, int y, qpic_t *pic, byte * translation)
{
	byte       *dest, *source, tbyte;
	unsigned short *pusdest;
	int         v, u;

	if (x < 0 || (unsigned) (x + pic->width) > vid.width || y < 0 ||
		(unsigned) (y + pic->height) > vid.height) {
		Sys_Error ("Draw_TransPic: bad coordinates");
	}

	source = pic->data;

	if (r_pixbytes == 1) {
		dest = vid.buffer + y * vid.rowbytes + x;

		if (pic->width & 7) {			// general
			for (v = 0; v < pic->height; v++) {
				for (u = 0; u < pic->width; u++)
					if ((tbyte = source[u]) != TRANSPARENT_COLOR)
						dest[u] = translation[tbyte];

				dest += vid.rowbytes;
				source += pic->width;
			}
		} else {						// unwound
			for (v = 0; v < pic->height; v++) {
				for (u = 0; u < pic->width; u += 8) {
					if ((tbyte = source[u]) != TRANSPARENT_COLOR)
						dest[u] = translation[tbyte];
					if ((tbyte = source[u + 1]) != TRANSPARENT_COLOR)
						dest[u + 1] = translation[tbyte];
					if ((tbyte = source[u + 2]) != TRANSPARENT_COLOR)
						dest[u + 2] = translation[tbyte];
					if ((tbyte = source[u + 3]) != TRANSPARENT_COLOR)
						dest[u + 3] = translation[tbyte];
					if ((tbyte = source[u + 4]) != TRANSPARENT_COLOR)
						dest[u + 4] = translation[tbyte];
					if ((tbyte = source[u + 5]) != TRANSPARENT_COLOR)
						dest[u + 5] = translation[tbyte];
					if ((tbyte = source[u + 6]) != TRANSPARENT_COLOR)
						dest[u + 6] = translation[tbyte];
					if ((tbyte = source[u + 7]) != TRANSPARENT_COLOR)
						dest[u + 7] = translation[tbyte];
				}
				dest += vid.rowbytes;
				source += pic->width;
			}
		}
	} else {
		// FIXME: pretranslate at load time?
		pusdest = (unsigned short *) vid.buffer + y * (vid.rowbytes >> 1) + x;

		for (v = 0; v < pic->height; v++) {
			for (u = 0; u < pic->width; u++) {
				tbyte = source[u];

				if (tbyte != TRANSPARENT_COLOR) {
					pusdest[u] = d_8to16table[tbyte];
				}
			}

			pusdest += vid.rowbytes >> 1;
			source += pic->width;
		}
	}
}


void
Draw_CharToConback (int num, byte * dest)
{
	int         row, col;
	byte       *source;
	int         drawline;
	int         x;

	row = num >> 4;
	col = num & 15;
	source = draw_chars + (row << 10) + (col << 3);

	drawline = 8;

	while (drawline--) {
		for (x = 0; x < 8; x++)
			if (source[x])
				dest[x] = 0x60 + source[x];
		source += 128;
		dest += 320;
	}

}

/*
	Draw_ConsoleBackground
*/
void
Draw_ConsoleBackground (int lines)
{
	int         x, y, v;
	byte       *src, *dest;
	unsigned short *pusdest;
	int         f, fstep;
	qpic_t     *conback;

	conback = Draw_CachePic ("gfx/conback.lmp");

	// draw the pic
	if (r_pixbytes == 1) {
		dest = vid.conbuffer;

		for (y = 0; y < lines; y++, dest += vid.conrowbytes) {
			v = (vid.conheight - lines + y) * 200 / vid.conheight;
			src = conback->data + v * 320;
			if (vid.conwidth == 320)
				memcpy (dest, src, vid.conwidth);
			else {
				f = 0;
				fstep = 320 * 0x10000 / vid.conwidth;
				for (x = 0; x < vid.conwidth; x += 4) {
					dest[x] = src[f >> 16];
					f += fstep;
					dest[x + 1] = src[f >> 16];
					f += fstep;
					dest[x + 2] = src[f >> 16];
					f += fstep;
					dest[x + 3] = src[f >> 16];
					f += fstep;
				}
			}
		}
	} else {
		pusdest = (unsigned short *) vid.conbuffer;

		for (y = 0; y < lines; y++, pusdest += (vid.conrowbytes >> 1)) {
			// FIXME: pre-expand to native format?
			// FIXME: does the endian switching go away in production?
			v = (vid.conheight - lines + y) * 200 / vid.conheight;
			src = conback->data + v * 320;
			f = 0;
			fstep = 320 * 0x10000 / vid.conwidth;
			for (x = 0; x < vid.conwidth; x += 4) {
				pusdest[x] = d_8to16table[src[f >> 16]];
				f += fstep;
				pusdest[x + 1] = d_8to16table[src[f >> 16]];
				f += fstep;
				pusdest[x + 2] = d_8to16table[src[f >> 16]];
				f += fstep;
				pusdest[x + 3] = d_8to16table[src[f >> 16]];
				f += fstep;
			}
		}
	}
}


/*
==============
R_DrawRect8
==============
*/
void
R_DrawRect8 (vrect_t *prect, int rowbytes, byte * psrc, int transparent)
{
	byte        t;
	int         i, j, srcdelta, destdelta;
	byte       *pdest;

	pdest = vid.buffer + (prect->y * vid.rowbytes) + prect->x;

	srcdelta = rowbytes - prect->width;
	destdelta = vid.rowbytes - prect->width;

	if (transparent) {
		for (i = 0; i < prect->height; i++) {
			for (j = 0; j < prect->width; j++) {
				t = *psrc;
				if (t != TRANSPARENT_COLOR) {
					*pdest = t;
				}

				psrc++;
				pdest++;
			}

			psrc += srcdelta;
			pdest += destdelta;
		}
	} else {
		for (i = 0; i < prect->height; i++) {
			memcpy (pdest, psrc, prect->width);
			psrc += rowbytes;
			pdest += vid.rowbytes;
		}
	}
}


/*
==============
R_DrawRect16
==============
*/
void
R_DrawRect16 (vrect_t *prect, int rowbytes, byte * psrc, int transparent)
{
	byte        t;
	int         i, j, srcdelta, destdelta;
	unsigned short *pdest;

// FIXME: would it be better to pre-expand native-format versions?

	pdest = (unsigned short *) vid.buffer +
		(prect->y * (vid.rowbytes >> 1)) + prect->x;

	srcdelta = rowbytes - prect->width;
	destdelta = (vid.rowbytes >> 1) - prect->width;

	if (transparent) {
		for (i = 0; i < prect->height; i++) {
			for (j = 0; j < prect->width; j++) {
				t = *psrc;
				if (t != TRANSPARENT_COLOR) {
					*pdest = d_8to16table[t];
				}

				psrc++;
				pdest++;
			}

			psrc += srcdelta;
			pdest += destdelta;
		}
	} else {
		for (i = 0; i < prect->height; i++) {
			for (j = 0; j < prect->width; j++) {
				*pdest = d_8to16table[*psrc];
				psrc++;
				pdest++;
			}

			psrc += srcdelta;
			pdest += destdelta;
		}
	}
}


/*
=============
Draw_TileClear

This repeats a 64*64 tile graphic to fill the screen around a sized down
refresh window.
=============
*/
void
Draw_TileClear (int x, int y, int w, int h)
{
	int         width, height, tileoffsetx, tileoffsety;
	byte       *psrc;
	vrect_t     vr;

	r_rectdesc.rect.x = x;
	r_rectdesc.rect.y = y;
	r_rectdesc.rect.width = w;
	r_rectdesc.rect.height = h;

	vr.y = r_rectdesc.rect.y;
	height = r_rectdesc.rect.height;

	tileoffsety = vr.y % r_rectdesc.height;

	while (height > 0) {
		vr.x = r_rectdesc.rect.x;
		width = r_rectdesc.rect.width;

		if (tileoffsety != 0)
			vr.height = r_rectdesc.height - tileoffsety;
		else
			vr.height = r_rectdesc.height;

		if (vr.height > height)
			vr.height = height;

		tileoffsetx = vr.x % r_rectdesc.width;

		while (width > 0) {
			if (tileoffsetx != 0)
				vr.width = r_rectdesc.width - tileoffsetx;
			else
				vr.width = r_rectdesc.width;

			if (vr.width > width)
				vr.width = width;

			psrc = r_rectdesc.ptexbytes +
				(tileoffsety * r_rectdesc.rowbytes) + tileoffsetx;

			if (r_pixbytes == 1) {
				R_DrawRect8 (&vr, r_rectdesc.rowbytes, psrc, 0);
			} else {
				R_DrawRect16 (&vr, r_rectdesc.rowbytes, psrc, 0);
			}

			vr.x += vr.width;
			width -= vr.width;
			tileoffsetx = 0;			// only the left tile can be
			// left-clipped
		}

		vr.y += vr.height;
		height -= vr.height;
		tileoffsety = 0;				// only the top tile can be
		// top-clipped
	}
}


/*
=============
Draw_Fill

Fills a box of pixels with a single color
=============
*/
void
Draw_Fill (int x, int y, int w, int h, int c)
{
	byte       *dest;
	unsigned short *pusdest;
	unsigned    uc;
	int         u, v;

	if (r_pixbytes == 1) {
		dest = vid.buffer + y * vid.rowbytes + x;
		for (v = 0; v < h; v++, dest += vid.rowbytes)
			for (u = 0; u < w; u++)
				dest[u] = c;
	} else {
		uc = d_8to16table[c];

		pusdest = (unsigned short *) vid.buffer + y * (vid.rowbytes >> 1) + x;
		for (v = 0; v < h; v++, pusdest += (vid.rowbytes >> 1))
			for (u = 0; u < w; u++)
				pusdest[u] = uc;
	}
}
//=============================================================================

/*
================
Draw_FadeScreen

================
*/
void
Draw_FadeScreen (void)
{
	int         x, y;
	byte       *pbuf;

	VID_UnlockBuffer ();
	S_ExtraUpdate ();
	VID_LockBuffer ();

	for (y = 0; y < vid.height; y++) {
		int         t;

		pbuf = (byte *) (vid.buffer + vid.rowbytes * y);
		t = (y & 1) << 1;

		for (x = 0; x < vid.width; x++) {
			if ((x & 3) != t)
				pbuf[x] = 0;
		}
	}

	VID_UnlockBuffer ();
	S_ExtraUpdate ();
	VID_LockBuffer ();
}

//=============================================================================

/*
================
Draw_BeginDisc

Draws the little blue disc in the corner of the screen.
Call before beginning any disc IO.
================
*/
void
Draw_BeginDisc (void)
{

	D_BeginDirectRect (vid.width - 24, 0, draw_disc->data, 24, 24);
}


/*
================
Draw_EndDisc

Erases the disc icon.
Call after completing any disc IO
================
*/
void
Draw_EndDisc (void)
{

	D_EndDirectRect (vid.width - 24, 0, 24, 24);
}

void
Draw_Crosshair (void)
{
	int         x, y;
	extern cvar_t *crosshair, *cl_crossx, *cl_crossy, *crosshaircolor;
	extern vrect_t scr_vrect;
	byte        c = (byte) crosshaircolor->value;


	if (crosshair->value == 2) {
		byte       *dest;

		x = scr_vrect.x + scr_vrect.width / 2 + cl_crossx->value;
		y = scr_vrect.y + scr_vrect.height / 2 + cl_crossy->value;

		dest = vid.conbuffer + y * vid.conrowbytes + x;

		dest[-3] = dest[-1] = dest[1] = dest[3] = c;
		dest[-3 * vid.conrowbytes] = dest[-1 * vid.conrowbytes] =
			dest[1 * vid.conrowbytes] = dest[3 * vid.conrowbytes] = c;
		// FIXME:  Find a better way to do this...
#if 0
		Draw_Pixel (x - 1, y, c);
		Draw_Pixel (x - 3, y, c);
		Draw_Pixel (x + 1, y, c);
		Draw_Pixel (x + 3, y, c);
		Draw_Pixel (x, y - 1, c);
		Draw_Pixel (x, y - 3, c);
		Draw_Pixel (x, y + 1, c);
		Draw_Pixel (x, y + 3, c);
#endif
	} else if (crosshair->value) {
		Draw_Character8 (scr_vrect.x + scr_vrect.width / 2 - 4 +
						 cl_crossx->value,
						 scr_vrect.y + scr_vrect.height / 2 - 4 +
						 cl_crossy->value, '+');
	}
}