Mercurial > sdl-ios-xcode
annotate src/video/math_private.h @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 19 Mar 2006 06:31:34 +0000 |
parents | 7a610f25c12f |
children | 782fd950bd46 |
rev | line source |
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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_name.h" |
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21 #include "SDL_endian.h" |
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22 |
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G:\SDL-12-CVS\src\video\math_private.h(171) : error C4226:
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23 #define huge really_big /* huge is a reserved keyword in VC++ 6.0 */ |
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24 #define u_int32_t uint32_t |
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25 |
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26 /* The original fdlibm code used statements like: |
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27 n0 = ((*(int*)&one)>>29)^1; * index of high word * |
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28 ix0 = *(n0+(int*)&x); * high word of x * |
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29 ix1 = *((1-n0)+(int*)&x); * low word of x * |
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30 to dig two 32 bit words out of the 64 bit IEEE floating point |
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31 value. That is non-ANSI, and, moreover, the gcc instruction |
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32 scheduler gets it wrong. We instead use the following macros. |
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33 Unlike the original code, we determine the endianness at compile |
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34 time, not at run time; I don't see much benefit to selecting |
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35 endianness at run time. */ |
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36 |
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37 /* A union which permits us to convert between a double and two 32 bit |
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38 ints. */ |
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39 |
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40 /* |
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41 * Math on arm is special: |
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42 * For FPA, float words are always big-endian. |
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43 * For VFP, floats words follow the memory system mode. |
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44 */ |
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45 |
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46 #if (SDL_BYTEORDER == SDL_BIG_ENDIAN) || \ |
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47 (!defined(__VFP_FP__) && (defined(__arm__) || defined(__thumb__))) |
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48 |
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49 typedef union |
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50 { |
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51 double value; |
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52 struct |
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53 { |
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54 u_int32_t msw; |
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55 u_int32_t lsw; |
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56 } parts; |
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57 } ieee_double_shape_type; |
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58 |
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59 #else |
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60 |
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61 typedef union |
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62 { |
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63 double value; |
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64 struct |
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65 { |
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66 u_int32_t lsw; |
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67 u_int32_t msw; |
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68 } parts; |
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69 } ieee_double_shape_type; |
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70 |
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71 #endif |
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72 |
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73 /* Get two 32 bit ints from a double. */ |
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74 |
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75 #define EXTRACT_WORDS(ix0,ix1,d) \ |
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76 do { \ |
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77 ieee_double_shape_type ew_u; \ |
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78 ew_u.value = (d); \ |
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79 (ix0) = ew_u.parts.msw; \ |
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80 (ix1) = ew_u.parts.lsw; \ |
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81 } while (0) |
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82 |
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83 /* Get the more significant 32 bit int from a double. */ |
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84 |
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85 #define GET_HIGH_WORD(i,d) \ |
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86 do { \ |
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87 ieee_double_shape_type gh_u; \ |
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88 gh_u.value = (d); \ |
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89 (i) = gh_u.parts.msw; \ |
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90 } while (0) |
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91 |
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92 /* Get the less significant 32 bit int from a double. */ |
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93 |
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94 #define GET_LOW_WORD(i,d) \ |
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95 do { \ |
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96 ieee_double_shape_type gl_u; \ |
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97 gl_u.value = (d); \ |
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98 (i) = gl_u.parts.lsw; \ |
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99 } while (0) |
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100 |
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101 /* Set a double from two 32 bit ints. */ |
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102 |
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103 #define INSERT_WORDS(d,ix0,ix1) \ |
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104 do { \ |
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105 ieee_double_shape_type iw_u; \ |
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106 iw_u.parts.msw = (ix0); \ |
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107 iw_u.parts.lsw = (ix1); \ |
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108 (d) = iw_u.value; \ |
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109 } while (0) |
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110 |
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111 /* Set the more significant 32 bits of a double from an int. */ |
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112 |
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113 #define SET_HIGH_WORD(d,v) \ |
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114 do { \ |
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115 ieee_double_shape_type sh_u; \ |
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116 sh_u.value = (d); \ |
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117 sh_u.parts.msw = (v); \ |
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118 (d) = sh_u.value; \ |
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119 } while (0) |
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120 |
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121 /* Set the less significant 32 bits of a double from an int. */ |
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122 |
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123 #define SET_LOW_WORD(d,v) \ |
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124 do { \ |
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125 ieee_double_shape_type sl_u; \ |
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126 sl_u.value = (d); \ |
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127 sl_u.parts.lsw = (v); \ |
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128 (d) = sl_u.value; \ |
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129 } while (0) |
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130 |
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131 /* A union which permits us to convert between a float and a 32 bit |
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132 int. */ |
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133 |
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134 typedef union |
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135 { |
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136 float value; |
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137 u_int32_t word; |
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138 } ieee_float_shape_type; |
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139 |
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140 /* Get a 32 bit int from a float. */ |
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141 |
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142 #define GET_FLOAT_WORD(i,d) \ |
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143 do { \ |
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144 ieee_float_shape_type gf_u; \ |
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145 gf_u.value = (d); \ |
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146 (i) = gf_u.word; \ |
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147 } while (0) |
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148 |
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149 /* Set a float from a 32 bit int. */ |
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150 |
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151 #define SET_FLOAT_WORD(d,i) \ |
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152 do { \ |
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153 ieee_float_shape_type sf_u; \ |
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154 sf_u.word = (i); \ |
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155 (d) = sf_u.value; \ |
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156 } while (0) |
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157 |
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158 |
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159 #ifdef __STDC__ |
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160 static const double |
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161 #else |
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162 static double |
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163 #endif |
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164 zero = 0.0, |
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165 one = 1.0, |
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166 two = 2.0, |
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167 two53 = 9007199254740992.0, /* 0x43400000, 0x00000000 */ |
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168 two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */ |
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169 twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */ |
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170 huge = 1.0e+300, |
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171 tiny = 1.0e-300; |
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172 |
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173 #endif /* _MATH_PRIVATE_H_ */ |