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annotate src/macros.h @ 5668:3d6d9bff3dd8 draft

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(svn r8128) -Codechange: Split sprite and palette remap into separate 32 bit values. This lets us increase the sprite width from 14 to up to 29 bits, effectively nulling the old sprite limit. Table changes in next commit.
author peter1138 <peter1138@openttd.org>
date Sun, 14 Jan 2007 19:57:49 +0000
parents 031b17c79c60
children d4f51c2fea04
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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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23 /* Objective C don't like templates */
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24 #ifdef __cplusplus
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25 template <typename T>
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26 static inline T max(T a, T b)
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27 {
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28 return a >= b ? a : b;
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29 }
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30 #endif
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31
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32 static inline int min(int a, int b) { if (a <= b) return a; return b; }
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33
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34 static inline uint minu(uint a, uint b) { if (a <= b) return a; return b; }
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36
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37 static inline int clamp(int a, int min, int 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 uint clampu(uint a, uint min, uint max)
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45 {
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46 if (a <= min) return min;
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47 if (a >= max) return max;
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48 return a;
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49 }
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50
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51 static inline int32 BIGMULSS(int32 a, int32 b, int shift) {
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52 return (int32)(((int64)(a) * (int64)(b)) >> (shift));
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53 }
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54
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55 static inline int64 BIGMULSS64(int64 a, int64 b, int shift) {
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56 return ((a) * (b)) >> (shift);
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57 }
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58
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59 static inline uint32 BIGMULUS(uint32 a, uint32 b, int shift) {
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60 return (uint32)(((uint64)(a) * (uint64)(b)) >> (shift));
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61 }
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62
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63 static inline int64 BIGMULS(int32 a, int32 b) {
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64 return (int64)(a) * (int64)(b);
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65 }
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66
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67 /* OPT: optimized into an unsigned comparison */
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68 //#define IS_INSIDE_1D(x, base, size) ((x) >= (base) && (x) < (base) + (size))
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69 #define IS_INSIDE_1D(x, base, size) ( (uint)((x) - (base)) < ((uint)(size)) )
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70
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71
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72 #define HASBIT(x,y) (((x) & (1 << (y))) != 0)
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73 #define SETBIT(x,y) ((x) |= (1 << (y)))
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74 #define CLRBIT(x,y) ((x) &= ~(1 << (y)))
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75 #define TOGGLEBIT(x,y) ((x) ^= (1 << (y)))
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76
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77 // checking more bits. Maybe unneccessary, but easy to use
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78 #define HASBITS(x,y) ((x) & (y))
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79 #define SETBITS(x,y) ((x) |= (y))
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80 #define CLRBITS(x,y) ((x) &= ~(y))
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81
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82 #define GENERAL_SPRITE_COLOR(color) ((color) + PALETTE_RECOLOR_START)
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83 #define PLAYER_SPRITE_COLOR(owner) (GENERAL_SPRITE_COLOR(_player_colors[owner]))
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84
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85 extern const byte _ffb_64[128];
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86 /* Returns the position of the first bit that is not zero, counted from the
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87 * left. Ie, 10110100 returns 2, 00000001 returns 0, etc. When x == 0 returns
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88 * 0.
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89 */
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90 #define FIND_FIRST_BIT(x) _ffb_64[(x)]
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91 /* Returns x with the first bit that is not zero, counted from the left, set
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92 * to zero. So, 10110100 returns 10110000, 00000001 returns 00000000, etc.
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93 */
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94 #define KILL_FIRST_BIT(x) _ffb_64[(x)+64]
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95
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96 static inline int FindFirstBit2x64(int value)
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97 {
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98 /*
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99 int i = 0;
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100 if ( (byte) value == 0) {
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101 i += 8;
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102 value >>= 8;
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103 }
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104 return i + FIND_FIRST_BIT(value & 0x3F);
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105
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106 Faster ( or at least cleaner ) implementation below?
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107 */
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108 if (GB(value, 0, 8) == 0) {
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109 return FIND_FIRST_BIT(GB(value, 8, 6)) + 8;
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110 } else {
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111 return FIND_FIRST_BIT(GB(value, 0, 6));
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112 }
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113
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114 }
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115
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116 static inline int KillFirstBit2x64(int value)
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117 {
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118 if (GB(value, 0, 8) == 0) {
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119 return KILL_FIRST_BIT(GB(value, 8, 6)) << 8;
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120 } else {
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121 return value & (KILL_FIRST_BIT(GB(value, 0, 6)) | 0x3F00);
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122 }
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123 }
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124
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125 /** returns true if value a has only one bit set to 1 */
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126 #define HAS_SINGLE_BIT(a) ( ((a) & ((a) - 1)) == 0)
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127
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128 /* [min,max), strictly less than */
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129 #define IS_BYTE_INSIDE(a,min,max) ((byte)((a)-(min)) < (byte)((max)-(min)))
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130 #define IS_INT_INSIDE(a,min,max) ((uint)((a)-(min)) < (uint)((max)-(min)))
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131
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132
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133 #define CHANCE16(a,b) ((uint16)Random() <= (uint16)((65536 * (a)) / (b)))
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134 #define CHANCE16R(a,b,r) ((uint16)(r=Random()) <= (uint16)((65536 * (a)) / (b)))
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135 #define CHANCE16I(a,b,v) ((uint16)(v) <= (uint16)((65536 * (a)) / (b)))
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136
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137
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138 #define for_each_bit(_i, _b) \
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139 for (_i = 0; _b != 0; _i++, _b >>= 1) \
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140 if (_b & 1)
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141
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142 #define abs myabs
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143
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144 static inline int intxchg_(int *a, int b) { int t = *a; *a = b; return t; }
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145 #define intswap(a,b) ((b) = intxchg_(&(a), (b)))
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146 static inline int uintxchg_(uint *a, uint b) { uint t = *a; *a = b; return t; }
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147 #define uintswap(a,b) ((b) = uintxchg_(&(a), (b)))
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148
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149
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150 static inline uint16 ReadLE16Aligned(const void* x)
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151 {
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152 return FROM_LE16(*(const uint16*)x);
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153 }
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154
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155 static inline uint16 ReadLE16Unaligned(const void* x)
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156 {
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157 #ifdef OTTD_ALIGNMENT
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158 return ((const byte*)x)[0] | ((const byte*)x)[1] << 8;
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159 #else
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160 return FROM_LE16(*(const uint16*)x);
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161 #endif
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162 }
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163
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164
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165 /**
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166 * ROtate x Left/Right by n (must be >= 0)
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167 * @note Assumes a byte has 8 bits
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168 */
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169 #define ROL(x, n) ((x) << (n) | (x) >> (sizeof(x) * 8 - (n)))
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170 #define ROR(x, n) ((x) >> (n) | (x) << (sizeof(x) * 8 - (n)))
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171
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172 /**
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173 * Return the smallest multiple of n equal or greater than x
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174 * @note n must be a power of 2
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175 */
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176 #define ALIGN(x, n) (((x) + (n) - 1) & ~((n) - 1))
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177
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178 /** return the largest value that can be entered in a variable.
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179 * known to work for uint32.
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180 * used by TGP to set the max value of the _patches.generation_seed in its definition
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181 */
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182 #define MAX_UVALUE(type) ((type)~(type)0)
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183
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184 #endif /* MACROS_H */