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annotate src/video/math_private.h @ 1339:62802d9d7c87

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author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 10:40:14 +0000
parents 450721ad5436
children 2eed9997bd24
rev   line source
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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1 /*
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2 * ====================================================
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3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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4 *
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5 * Developed at SunPro, a Sun Microsystems, Inc. business.
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6 * Permission to use, copy, modify, and distribute this
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7 * software is freely granted, provided that this notice
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8 * is preserved.
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9 * ====================================================
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10 */
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11
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12 /*
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13 * from: @(#)fdlibm.h 5.1 93/09/24
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14 * $Id$
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15 */
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16
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17 #ifndef _MATH_PRIVATE_H_
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18 #define _MATH_PRIVATE_H_
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19
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20 #include "SDL_endian.h"
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21
1339
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22 #define int32_t math_int32_t
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23 #define u_int32_t math_u_int32_t
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24 typedef Sint32 math_int32_t;
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25 typedef Uint32 math_u_int32_t;
1330
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26
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27 /* The original fdlibm code used statements like:
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28 n0 = ((*(int*)&one)>>29)^1; * index of high word *
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29 ix0 = *(n0+(int*)&x); * high word of x *
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30 ix1 = *((1-n0)+(int*)&x); * low word of x *
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31 to dig two 32 bit words out of the 64 bit IEEE floating point
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32 value. That is non-ANSI, and, moreover, the gcc instruction
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33 scheduler gets it wrong. We instead use the following macros.
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34 Unlike the original code, we determine the endianness at compile
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35 time, not at run time; I don't see much benefit to selecting
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36 endianness at run time. */
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37
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38 /* A union which permits us to convert between a double and two 32 bit
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39 ints. */
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40
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41 /*
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42 * Math on arm is special:
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43 * For FPA, float words are always big-endian.
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44 * For VFP, floats words follow the memory system mode.
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45 */
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46
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47 #if (SDL_BYTEORDER == SDL_BIG_ENDIAN) || \
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48 (!defined(__VFP_FP__) && (defined(__arm__) || defined(__thumb__)))
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49
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50 typedef union
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51 {
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52 double value;
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53 struct
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54 {
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55 u_int32_t msw;
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56 u_int32_t lsw;
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57 } parts;
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58 } ieee_double_shape_type;
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59
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60 #else
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61
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62 typedef union
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63 {
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64 double value;
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65 struct
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66 {
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67 u_int32_t lsw;
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68 u_int32_t msw;
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69 } parts;
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70 } ieee_double_shape_type;
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71
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72 #endif
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73
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74 /* Get two 32 bit ints from a double. */
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75
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76 #define EXTRACT_WORDS(ix0,ix1,d) \
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77 do { \
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78 ieee_double_shape_type ew_u; \
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79 ew_u.value = (d); \
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80 (ix0) = ew_u.parts.msw; \
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81 (ix1) = ew_u.parts.lsw; \
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82 } while (0)
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83
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84 /* Get the more significant 32 bit int from a double. */
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85
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86 #define GET_HIGH_WORD(i,d) \
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87 do { \
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88 ieee_double_shape_type gh_u; \
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89 gh_u.value = (d); \
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90 (i) = gh_u.parts.msw; \
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91 } while (0)
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92
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93 /* Get the less significant 32 bit int from a double. */
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94
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95 #define GET_LOW_WORD(i,d) \
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96 do { \
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97 ieee_double_shape_type gl_u; \
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98 gl_u.value = (d); \
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99 (i) = gl_u.parts.lsw; \
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100 } while (0)
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101
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102 /* Set a double from two 32 bit ints. */
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103
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104 #define INSERT_WORDS(d,ix0,ix1) \
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105 do { \
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106 ieee_double_shape_type iw_u; \
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107 iw_u.parts.msw = (ix0); \
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108 iw_u.parts.lsw = (ix1); \
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109 (d) = iw_u.value; \
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110 } while (0)
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111
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112 /* Set the more significant 32 bits of a double from an int. */
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113
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114 #define SET_HIGH_WORD(d,v) \
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115 do { \
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116 ieee_double_shape_type sh_u; \
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117 sh_u.value = (d); \
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118 sh_u.parts.msw = (v); \
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119 (d) = sh_u.value; \
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120 } while (0)
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121
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122 /* Set the less significant 32 bits of a double from an int. */
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123
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124 #define SET_LOW_WORD(d,v) \
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125 do { \
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126 ieee_double_shape_type sl_u; \
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127 sl_u.value = (d); \
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128 sl_u.parts.lsw = (v); \
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129 (d) = sl_u.value; \
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130 } while (0)
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131
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132 /* A union which permits us to convert between a float and a 32 bit
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133 int. */
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134
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135 typedef union
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136 {
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137 float value;
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138 u_int32_t word;
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139 } ieee_float_shape_type;
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140
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141 /* Get a 32 bit int from a float. */
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142
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143 #define GET_FLOAT_WORD(i,d) \
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144 do { \
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145 ieee_float_shape_type gf_u; \
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146 gf_u.value = (d); \
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147 (i) = gf_u.word; \
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148 } while (0)
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149
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150 /* Set a float from a 32 bit int. */
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151
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152 #define SET_FLOAT_WORD(d,i) \
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153 do { \
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154 ieee_float_shape_type sf_u; \
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155 sf_u.word = (i); \
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156 (d) = sf_u.value; \
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157 } while (0)
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158
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159
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160 #ifdef __STDC__
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161 static const double
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162 #else
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163 static double
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164 #endif
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165 zero = 0.0,
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166 one = 1.0,
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167 two = 2.0,
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168 two53 = 9007199254740992.0, /* 0x43400000, 0x00000000 */
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169 two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
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170 twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
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171 huge = 1.0e+300,
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172 tiny = 1.0e-300;
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173
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174 #endif /* _MATH_PRIVATE_H_ */