source: abuse/trunk/src/common.h @ 525

Last change on this file since 525 was 525, checked in by Sam Hocevar, 11 years ago

core: replace all byte swapping macros with inline functions.

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File size: 1.6 KB
Line 
1/*
2 *  Abuse - dark 2D side-scrolling platform game
3 *  Copyright (c) 1995 Crack dot Com
4 *  Copyright (c) 2005-2011 Sam Hocevar <sam@hocevar.net>
5 *
6 *  This software was released into the Public Domain. As with most public
7 *  domain software, no warranty is made or implied by Crack dot Com or
8 *  Jonathan Clark.
9 */
10
11#ifndef __COMMON_H__
12#define __COMMON_H__
13
14//
15// Globally required headers
16//
17#include <stdint.h>
18#include <stdio.h>
19
20//
21// Lol Engine
22//
23#include "lol/matrix.h"
24using namespace lol;
25
26//
27// Custom utility functions
28//
29static inline int Min(int a, int b) { return a < b ? a : b; }
30static inline int Max(int a, int b) { return a > b ? a : b; }
31static inline float Min(float a, float b) { return a < b ? a : b; }
32static inline float Max(float a, float b) { return a > b ? a : b; }
33
34//
35// Byte swapping
36//
37static inline int BigEndian()
38{
39    union { uint32_t const x; uint8_t t[4]; } const u = { 0x01ffff00 };
40    return u.t[0];
41}
42
43static inline uint16_t lstl(uint16_t x)
44{
45    if (BigEndian())
46        return ((uint16_t)x << 8 ) | ((uint16_t)x >> 8);
47    return x;
48}
49
50static inline uint32_t lltl(uint32_t x)
51{
52    if (BigEndian())
53        return ((uint32_t)x >> 24) | (((uint32_t)x & 0x00ff0000) >> 8)
54             | (((uint32_t)x & 0x0000ff00) << 8) | ((uint32_t)x << 24);
55    return x;
56}
57
58#define ERROR(x,st) { if (!(x)) \
59   { printf("Error on line %d of %s : %s\n", \
60     __LINE__,__FILE__,st); exit(1); } }
61
62// These macros should be removed for the non-debugging version
63#ifdef NO_CHECK
64#   define CONDITION(x,st)
65#   define CHECK(x)
66#else
67#   define CONDITION(x,st) ERROR(x,st)
68#   define CHECK(x) CONDITION(x,"Check stop");
69#endif
70
71#endif // __COMMON_H__
72
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