yquake2remaster/src/refresh/gl_scrap.c

/*
 * 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.
 *
 * =======================================================================
 *
 * Allocate all the little status bar obejcts into a single texture 
 * to crutch up inefficient hardware / drivers.
 *
 * =======================================================================
 */

#include "header/local.h"

int scrap_allocated [ MAX_SCRAPS ] [ BLOCK_WIDTH ];
byte scrap_texels [ MAX_SCRAPS ] [ BLOCK_WIDTH * BLOCK_HEIGHT ];
qboolean scrap_dirty;
int scrap_uploads;

qboolean R_Upload8 ( byte *data, int width, int height,  qboolean mipmap, qboolean is_sky );

/* returns a texture number and the position inside it */
int
Scrap_AllocBlock ( int w, int h, int *x, int *y )
{
	int i, j;
	int best, best2;
	int texnum;

	for ( texnum = 0; texnum < MAX_SCRAPS; texnum++ )
	{
		best = BLOCK_HEIGHT;

		for ( i = 0; i < BLOCK_WIDTH - w; i++ )
		{
			best2 = 0;

			for ( j = 0; j < w; j++ )
			{
				if ( scrap_allocated [ texnum ] [ i + j ] >= best )
				{
					break;
				}

				if ( scrap_allocated [ texnum ] [ i + j ] > best2 )
				{
					best2 = scrap_allocated [ texnum ] [ i + j ];
				}
			}

			if ( j == w )
			{   /* this is a valid spot */
				*x = i;
				*y = best = best2;
			}
		}

		if ( best + h > BLOCK_HEIGHT )
		{
			continue;
		}

		for ( i = 0; i < w; i++ )
		{
			scrap_allocated [ texnum ] [ *x + i ] = best + h;
		}

		return ( texnum );
	}

	return ( -1 );
}

void
Scrap_Upload ( void )
{
	scrap_uploads++;
	R_Bind( TEXNUM_SCRAPS );
	R_Upload8( scrap_texels [ 0 ], BLOCK_WIDTH, BLOCK_HEIGHT, false, false );
	scrap_dirty = false;
}