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| 44 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
44 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
| 45 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
45 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
| 46 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
46 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
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47 | |
| 48 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
48 | 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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49 | |
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50 | // lots of stuff taken from FXT |
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51 | |
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52 | /* Rotate right. This is used in various places for checksumming */ |
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53 | //TODO: this sucks, use a better checksum algo |
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54 | static inline uint32_t |
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55 | rotate_right (uint32_t c) |
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56 | { |
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57 | return (c << 31) | (c >> 1); |
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58 | } |
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59 | |
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60 | // Return abs(a-b) |
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61 | // Both a and b must not have the most significant bit set |
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62 | static inline uint32_t |
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63 | upos_abs_diff (uint32_t a, uint32_t b) |
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64 | { |
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65 | long d1 = b - a; |
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66 | long d2 = (d1 & (d1 >> 31)) << 1; |
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67 | |
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68 | return d1 - d2; // == (b - d) - (a + d); |
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69 | } |
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70 | |
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71 | // Both a and b must not have the most significant bit set |
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72 | static inline uint32_t |
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73 | upos_min (uint32_t a, uint32_t b) |
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74 | { |
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75 | int32_t d = b - a; |
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76 | d &= d >> 31; |
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77 | return a + d; |
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78 | } |
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79 | |
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80 | // Both a and b must not have the most significant bit set |
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81 | static inline uint32_t |
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82 | upos_max (uint32_t a, uint32_t b) |
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83 | { |
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84 | int32_t d = b - a; |
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85 | d &= d >> 31; |
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86 | return b - d; |
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87 | } |
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88 | |
| 50 | // this is much faster than crossfires original algorithm |
89 | // this is much faster than crossfires original algorithm |
| 51 | // on modern cpus |
90 | // on modern cpus |
| 52 | inline int |
91 | inline int |
| 53 | isqrt (int n) |
92 | isqrt (int n) |
