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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2015 Franklin Wei
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include <stdint.h>
#include "xracer.h"
#include "fixedpoint.h"
/* finds the address of a segment corresponding to a z coordinate */
#define FIND_SEGMENT(z, r, l) (&r[(int)((float)z/SEGMENT_LENGTH)%l])
/* linearly interpolates a and b with percent having FRACBITS fractional bits */
#define INTERPOLATE(a, b, percent) (((a << FRACBITS) + fp_mul((b<<FRACBITS)-(a<<FRACBITS), percent, FRACBITS)) >> FRACBITS)
/* rounds a fixed-point number with FRACBITS fractional bits */
/* returns an integer */
/* adds 1/2 and truncates the fractional bits */
#define ROUND(x) ((x+(1<<(FRACBITS-1)))>>FRACBITS)
#ifdef ROCKBOX_LITTLE_ENDIAN
#define READ_BE_UINT16(p) ((((const uint8_t*)p)[0] << 8) | ((const uint8_t*)p)[1])
#define READ_BE_UINT32(p) ((((const uint8_t*)p)[0] << 24) | (((const uint8_t*)p)[1] << 16) | (((const uint8_t*)p)[2] << 8) | ((const uint8_t*)p)[3])
#else
#define READ_BE_UINT16(p) (*(const uint16_t*)p)
#define READ_BE_UINT32(p) (*(const uint32_t*)p)
#endif
/* call this before using any alloc functions or the plugin buffer */
void init_alloc(void);
void *util_alloc(size_t);
size_t util_alloc_remaining(void);
/* camera_calc_depth(): calculates the camera depth given its FOV by evaluating */
/* LCD_WIDTH / tan(fov/2) */
int camera_calc_depth(int fov);
void warning_real(const char *msg, ...);
void error_real(const char *msg, ...);
unsigned short crc16_ccitt(unsigned char *data, size_t length, unsigned short seed, unsigned short final);
#define warning warning_real
#define error error_real
/*#define warning(msg, ...) warning_real("in function %s at %s:%d: %s", __func__, __FILE__, __LINE__, msg, ##__VA_ARGS__)
#define error(msg, ...) error_real("in function %s at %s:%d: %s", __func__, __FILE__, __LINE__, msg, ##__VA_ARGS__)*/
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