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annotate src/video/math_private.h @ 1555:780fd5b61df1

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Fixed bug #89 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:05:16 +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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2eed9997bd24 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_ */