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6 | |
6 | |
7 | #define PP_CONCAT_(a, b) a ## b |
7 | #define PP_CONCAT_(a, b) a ## b |
8 | #define PP_CONCAT(a, b) PP_CONCAT_(a, b) |
8 | #define PP_CONCAT(a, b) PP_CONCAT_(a, b) |
9 | #define PP_STRINGIFY_(a) #a |
9 | #define PP_STRINGIFY_(a) #a |
10 | #define PP_STRINGIFY(a) PP_STRINGIFY_(a) |
10 | #define PP_STRINGIFY(a) PP_STRINGIFY_(a) |
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11 | |
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12 | // actually, some gcc-3.x versions work, too |
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13 | #define HAVE_GCC_BUILTINS (__GNUC__ >= 4) |
11 | |
14 | |
12 | extern class byteorder { |
15 | extern class byteorder { |
13 | static unsigned int e; // at least 32 bits |
16 | static unsigned int e; // at least 32 bits |
14 | public: |
17 | public: |
15 | byteorder (); |
18 | byteorder (); |
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28 | |
31 | |
29 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
32 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
30 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = v < (T)a ? a : v >(T)b ? b : v; } |
33 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = v < (T)a ? a : v >(T)b ? b : v; } |
31 | |
34 | |
32 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
35 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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36 | |
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37 | // linear interpolation |
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38 | template<typename T, typename U, typename P> |
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39 | static inline |
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40 | T lerp (T a, U b, P p) |
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41 | { |
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42 | return (int(a) * int(p) + int(b) * int(100 - p)) / 100; |
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43 | } |
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44 | |
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45 | // some bit functions, xft fuck me plenty |
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46 | #if HAVE_GCC_BUILTINS |
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47 | static inline int ctz (unsigned int x) { return __builtin_ctz (x); } |
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48 | static inline int popcount (unsigned int x) { return __builtin_popcount (x); } |
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49 | #else |
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50 | // count trailing zero bits and count # of one bits |
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51 | int ctz (unsigned int x); |
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52 | int popcount (unsigned int x); |
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53 | #endif |
33 | |
54 | |
34 | // in range including end |
55 | // in range including end |
35 | #define IN_RANGE_INC(val,beg,end) \ |
56 | #define IN_RANGE_INC(val,beg,end) \ |
36 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
57 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
37 | |
58 | |