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annotate src/macros.h @ 5602:0727c102447e draft

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(svn r8056) -Codechange: Remove swap_byte, swap_byte, and siblings (some were not used anyway) and replace them by our SwapT implementation
author celestar <celestar@openttd.org>
date Thu, 11 Jan 2007 12:32:10 +0000
parents ca6b459bf488
children 3c4ee4960912
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* $Id$ */
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2
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3 #ifndef MACROS_H
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4 #define MACROS_H
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5
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6 #include "map.h"
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7
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8 /// Fetch n bits starting at bit s from x
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9 #define GB(x, s, n) (((x) >> (s)) & ((1U << (n)) - 1))
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10 /// Set n bits starting at bit s in x to d
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11 #define SB(x, s, n, d) ((x) = ((x) & ~(((1U << (n)) - 1) << (s))) | ((d) << (s)))
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12 /// Add i to the n bits starting at bit s in x
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13 #define AB(x, s, n, i) ((x) = ((x) & ~(((1U << (n)) - 1) << (s))) | (((x) + ((i) << (s))) & (((1U << (n)) - 1) << (s))))
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14
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15 #ifdef min
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16 #undef min
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17 #endif
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18
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19 #ifdef max
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20 #undef max
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21 #endif
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22
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ca6b459bf488 (svn r8055) -Codechange: Replace the different max, dmax, maxu whatever macros by a simple template function max(), that requires two arguments of the same type. While I'm at it change a variable called "max" to "maxval" in a function that calls max().
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23 template <typename T> T max(T a, T b) { return a >= b ? a : b; }
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24
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25 static inline int min(int a, int b) { if (a <= b) return a; return b; }
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26
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27 static inline uint minu(uint a, uint b) { if (a <= b) return a; return b; }
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28
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29
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30 static inline int clamp(int a, int min, int max)
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31 {
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32 if (a <= min) return min;
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33 if (a >= max) return max;
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34 return a;
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35 }
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36
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37 static inline uint clampu(uint a, uint min, uint max)
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38 {
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39 if (a <= min) return min;
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40 if (a >= max) return max;
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41 return a;
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42 }
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43
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44 static inline int32 BIGMULSS(int32 a, int32 b, int shift) {
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45 return (int32)(((int64)(a) * (int64)(b)) >> (shift));
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46 }
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47
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48 static inline int64 BIGMULSS64(int64 a, int64 b, int shift) {
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49 return ((a) * (b)) >> (shift);
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50 }
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51
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52 static inline uint32 BIGMULUS(uint32 a, uint32 b, int shift) {
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53 return (uint32)(((uint64)(a) * (uint64)(b)) >> (shift));
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54 }
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55
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56 static inline int64 BIGMULS(int32 a, int32 b) {
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57 return (int64)(a) * (int64)(b);
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58 }
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59
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60 /* OPT: optimized into an unsigned comparison */
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61 //#define IS_INSIDE_1D(x, base, size) ((x) >= (base) && (x) < (base) + (size))
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62 #define IS_INSIDE_1D(x, base, size) ( (uint)((x) - (base)) < ((uint)(size)) )
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63
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64
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65 #define HASBIT(x,y) (((x) & (1 << (y))) != 0)
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66 #define SETBIT(x,y) ((x) |= (1 << (y)))
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67 #define CLRBIT(x,y) ((x) &= ~(1 << (y)))
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68 #define TOGGLEBIT(x,y) ((x) ^= (1 << (y)))
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69
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70 // checking more bits. Maybe unneccessary, but easy to use
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71 #define HASBITS(x,y) ((x) & (y))
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72 #define SETBITS(x,y) ((x) |= (y))
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73 #define CLRBITS(x,y) ((x) &= ~(y))
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74
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75 #define GENERAL_SPRITE_COLOR(color) ( ((color) + PALETTE_RECOLOR_START) << PALETTE_SPRITE_START)
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76 #define PLAYER_SPRITE_COLOR(owner) ( GENERAL_SPRITE_COLOR(_player_colors[owner]))
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77 #define SPRITE_PALETTE(x) ((x) | PALETTE_MODIFIER_COLOR)
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78
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79 extern const byte _ffb_64[128];
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80 /* Returns the position of the first bit that is not zero, counted from the
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81 * left. Ie, 10110100 returns 2, 00000001 returns 0, etc. When x == 0 returns
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82 * 0.
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83 */
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84 #define FIND_FIRST_BIT(x) _ffb_64[(x)]
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85 /* Returns x with the first bit that is not zero, counted from the left, set
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86 * to zero. So, 10110100 returns 10110000, 00000001 returns 00000000, etc.
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87 */
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88 #define KILL_FIRST_BIT(x) _ffb_64[(x)+64]
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89
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90 static inline int FindFirstBit2x64(int value)
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91 {
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92 /*
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93 int i = 0;
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94 if ( (byte) value == 0) {
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95 i += 8;
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96 value >>= 8;
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97 }
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98 return i + FIND_FIRST_BIT(value & 0x3F);
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99
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100 Faster ( or at least cleaner ) implementation below?
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101 */
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102 if (GB(value, 0, 8) == 0) {
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103 return FIND_FIRST_BIT(GB(value, 8, 6)) + 8;
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104 } else {
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105 return FIND_FIRST_BIT(GB(value, 0, 6));
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106 }
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107
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108 }
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109
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110 static inline int KillFirstBit2x64(int value)
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111 {
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112 if (GB(value, 0, 8) == 0) {
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113 return KILL_FIRST_BIT(GB(value, 8, 6)) << 8;
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114 } else {
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115 return value & (KILL_FIRST_BIT(GB(value, 0, 6)) | 0x3F00);
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116 }
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117 }
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118
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119 /** returns true if value a has only one bit set to 1 */
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120 #define HAS_SINGLE_BIT(a) ( ((a) & ((a) - 1)) == 0)
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121
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122 /* [min,max), strictly less than */
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123 #define IS_BYTE_INSIDE(a,min,max) ((byte)((a)-(min)) < (byte)((max)-(min)))
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124 #define IS_INT_INSIDE(a,min,max) ((uint)((a)-(min)) < (uint)((max)-(min)))
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125
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126
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127 #define CHANCE16(a,b) ((uint16)Random() <= (uint16)((65536 * (a)) / (b)))
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128 #define CHANCE16R(a,b,r) ((uint16)(r=Random()) <= (uint16)((65536 * (a)) / (b)))
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129 #define CHANCE16I(a,b,v) ((uint16)(v) <= (uint16)((65536 * (a)) / (b)))
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130
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131
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132 #define for_each_bit(_i, _b) \
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133 for (_i = 0; _b != 0; _i++, _b >>= 1) \
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134 if (_b & 1)
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135
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136 #define abs myabs
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137
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138 static inline int intxchg_(int *a, int b) { int t = *a; *a = b; return t; }
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139 #define intswap(a,b) ((b) = intxchg_(&(a), (b)))
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140 static inline int uintxchg_(uint *a, uint b) { uint t = *a; *a = b; return t; }
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141 #define uintswap(a,b) ((b) = uintxchg_(&(a), (b)))
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142
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143
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144 static inline uint16 ReadLE16Aligned(const void* x)
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145 {
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146 return FROM_LE16(*(const uint16*)x);
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147 }
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148
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149 static inline uint16 ReadLE16Unaligned(const void* x)
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150 {
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151 #ifdef OTTD_ALIGNMENT
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152 return ((const byte*)x)[0] | ((const byte*)x)[1] << 8;
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153 #else
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154 return FROM_LE16(*(const uint16*)x);
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155 #endif
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156 }
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157
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158
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159 /**
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160 * ROtate x Left/Right by n (must be >= 0)
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161 * @note Assumes a byte has 8 bits
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162 */
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163 #define ROL(x, n) ((x) << (n) | (x) >> (sizeof(x) * 8 - (n)))
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164 #define ROR(x, n) ((x) >> (n) | (x) << (sizeof(x) * 8 - (n)))
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165
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166 /**
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167 * Return the smallest multiple of n equal or greater than x
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168 * @note n must be a power of 2
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169 */
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170 #define ALIGN(x, n) (((x) + (n) - 1) & ~((n) - 1))
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171
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172 /** return the largest value that can be entered in a variable.
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173 * known to work for uint32.
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174 * used by TGP to set the max value of the _patches.generation_seed in its definition
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175 */
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176 #define MAX_UVALUE(type) ((type)~(type)0)
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177
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178 #endif /* MACROS_H */