Mercurial > sdl-ios-xcode
annotate src/audio/sdlgenaudiocvt.pl @ 1985:8055185ae4ed
Added source color and alpha modulation support.
Added perl script to generate optimized render copy functions.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 28 Aug 2006 03:17:39 +0000 |
parents | 3b4ce57c6215 |
children | b2b7154ce016 |
rev | line source |
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1982
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1 #!/usr/bin/perl -w |
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2 |
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3 use warnings; |
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4 use strict; |
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5 |
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6 my @audiotypes = qw( |
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7 U8 |
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8 S8 |
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9 U16LSB |
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10 S16LSB |
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11 U16MSB |
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12 S16MSB |
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13 S32LSB |
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14 S32MSB |
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15 F32LSB |
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16 F32MSB |
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17 ); |
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18 |
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19 my %funcs; |
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20 |
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21 my $custom_converters = 0; |
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22 |
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23 |
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24 sub outputHeader { |
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25 print <<EOF; |
1985
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26 /* DO NOT EDIT! This file is generated by sdlgenaudiocvt.pl */ |
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27 /* |
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28 SDL - Simple DirectMedia Layer |
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29 Copyright (C) 1997-2006 Sam Lantinga |
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30 |
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31 This library is free software; you can redistribute it and/or |
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32 modify it under the terms of the GNU Lesser General Public |
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33 License as published by the Free Software Foundation; either |
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34 version 2.1 of the License, or (at your option) any later version. |
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35 |
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36 This library is distributed in the hope that it will be useful, |
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37 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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38 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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39 Lesser General Public License for more details. |
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40 |
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41 You should have received a copy of the GNU Lesser General Public |
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42 License along with this library; if not, write to the Free Software |
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43 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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44 |
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45 Sam Lantinga |
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46 slouken\@libsdl.org |
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47 */ |
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48 |
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49 #include "SDL_config.h" |
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50 #include "SDL_audio.h" |
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51 #include "SDL_audio_c.h" |
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52 |
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53 /* *INDENT-OFF* */ |
1982
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54 |
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55 EOF |
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56 |
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57 my @vals = ( 127, 255, 32767, 65535, 2147483647 ); |
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58 foreach (@vals) { |
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59 my $val = $_; |
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60 my $fval = 1.0 / $val; |
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61 print("#define DIVBY${val} ${fval}f\n"); |
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62 } |
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63 |
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64 print("\n"); |
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65 } |
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66 |
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67 sub outputFooter { |
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68 print <<EOF; |
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69 /* *INDENT-ON* */ |
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70 |
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71 /* vi: set ts=4 sw=4 expandtab: */ |
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72 EOF |
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73 } |
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74 |
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75 sub splittype { |
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76 my $t = shift; |
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77 my ($signed, $size, $endian) = $t =~ /([USF])(\d+)([LM]SB|)/; |
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78 my $float = ($signed eq 'F') ? 1 : 0; |
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79 $signed = (($float) or ($signed eq 'S')) ? 1 : 0; |
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80 $endian = 'NONE' if ($endian eq ''); |
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81 |
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82 my $ctype = ''; |
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83 if ($float) { |
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84 $ctype = (($size == 32) ? 'float' : 'double'); |
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85 } else { |
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86 $ctype = (($signed) ? 'S' : 'U') . "int${size}"; |
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87 } |
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88 |
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89 return ($signed, $float, $size, $endian, $ctype); |
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90 } |
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91 |
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92 sub getSwapFunc { |
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93 my ($size, $signed, $float, $endian, $val) = @_; |
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94 my $BEorLE = (($endian eq 'MSB') ? 'BE' : 'LE'); |
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95 my $code = ''; |
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96 |
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97 if ($float) { |
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98 $code = "SDL_SwapFloat${BEorLE}($val)"; |
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99 } else { |
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100 if ($size > 8) { |
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101 $code = "SDL_Swap${BEorLE}${size}($val)"; |
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102 } else { |
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103 $code = $val; |
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104 } |
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105 |
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106 if (($signed) and (!$float)) { |
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107 $code = "((Sint${size}) $code)"; |
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108 } |
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109 } |
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110 |
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111 return "${code}"; |
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112 } |
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113 |
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114 |
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115 sub maxIntVal { |
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116 my ($signed, $size) = @_; |
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117 if ($signed) { |
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118 if ($size == 8) { |
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119 return 0x7F; |
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120 } elsif ($size == 16) { |
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121 return 0x7FFF; |
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122 } elsif ($size == 32) { |
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123 return 0x7FFFFFFF; |
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124 } |
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125 } else { |
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126 if ($size == 8) { |
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127 return 0xFF; |
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128 } elsif ($size == 16) { |
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129 return 0xFFFF; |
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130 } elsif ($size == 32) { |
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131 return 0xFFFFFFFF; |
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132 } |
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133 } |
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134 |
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135 die("bug in script.\n"); |
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136 } |
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137 |
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138 sub getFloatToIntMult { |
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139 my ($signed, $size) = @_; |
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140 my $val = maxIntVal($signed, $size) . '.0'; |
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141 $val .= 'f' if ($size < 32); |
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142 return $val; |
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143 } |
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144 |
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145 sub getIntToFloatDivBy { |
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146 my ($signed, $size) = @_; |
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147 return 'DIVBY' . maxIntVal($signed, $size); |
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148 } |
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149 |
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150 sub getSignFlipVal { |
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151 my $size = shift; |
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152 if ($size == 8) { |
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153 return '0x80'; |
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154 } elsif ($size == 16) { |
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155 return '0x8000'; |
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156 } elsif ($size == 32) { |
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157 return '0x80000000'; |
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158 } |
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159 |
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160 die("bug in script.\n"); |
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161 } |
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162 |
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163 sub buildCvtFunc { |
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164 my ($from, $to) = @_; |
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165 my ($fsigned, $ffloat, $fsize, $fendian, $fctype) = splittype($from); |
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166 my ($tsigned, $tfloat, $tsize, $tendian, $tctype) = splittype($to); |
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167 my $diffs = 0; |
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168 $diffs++ if ($fsize != $tsize); |
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169 $diffs++ if ($fsigned != $tsigned); |
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170 $diffs++ if ($ffloat != $tfloat); |
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171 $diffs++ if ($fendian ne $tendian); |
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172 |
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173 return if ($diffs == 0); |
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174 |
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175 my $hashid = "$from/$to"; |
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176 if (1) { # !!! FIXME: if ($diffs > 1) { |
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177 my $sym = "SDL_Convert_${from}_to_${to}"; |
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178 $funcs{$hashid} = $sym; |
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179 $custom_converters++; |
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180 |
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181 # Always unsigned for ints, for possible byteswaps. |
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182 my $srctype = (($ffloat) ? 'float' : "Uint${fsize}"); |
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183 |
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184 print <<EOF; |
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185 static void SDLCALL |
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186 ${sym}(SDL_AudioCVT * cvt, SDL_AudioFormat format) |
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187 { |
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188 int i; |
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189 const $srctype *src; |
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190 $tctype *dst; |
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191 |
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192 #ifdef DEBUG_CONVERT |
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193 fprintf(stderr, "Converting AUDIO_${from} to AUDIO_${to}.\\n"); |
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194 #endif |
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195 |
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196 EOF |
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197 |
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198 if ($fsize < $tsize) { |
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199 my $mult = $tsize / $fsize; |
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200 print <<EOF; |
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201 src = (const $srctype *) (cvt->buf + cvt->len_cvt); |
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|
202 dst = ($tctype *) (cvt->buf + cvt->len_cvt * $mult); |
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203 for (i = cvt->len_cvt / sizeof ($srctype); i; --i, --src, --dst) { |
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204 EOF |
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|
205 } else { |
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|
206 print <<EOF; |
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|
207 src = (const $srctype *) cvt->buf; |
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208 dst = ($tctype *) cvt->buf; |
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209 for (i = cvt->len_cvt / sizeof ($srctype); i; --i, ++src, ++dst) { |
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210 EOF |
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|
211 } |
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212 |
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213 # Have to convert to/from float/int. |
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214 # !!! FIXME: cast through double for int32<->float? |
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215 my $code = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, '*src'); |
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|
216 if ($ffloat != $tfloat) { |
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|
217 if ($ffloat) { |
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|
218 my $mult = getFloatToIntMult($tsigned, $tsize); |
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|
219 $code = "(($tctype) ($code * $mult))"; |
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|
220 } else { |
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|
221 # $divby will be the reciprocal, to avoid pipeline stalls |
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|
222 # from floating point division...so multiply it. |
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223 my $divby = getIntToFloatDivBy($fsigned, $fsize); |
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|
224 $code = "(((float) $code) * $divby)"; |
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|
225 } |
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|
226 } else { |
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|
227 # All integer conversions here. |
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228 if ($fsigned != $tsigned) { |
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229 my $signflipval = getSignFlipVal($fsize); |
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|
230 $code = "(($code) ^ $signflipval)"; |
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|
231 } |
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|
232 |
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233 my $shiftval = abs($fsize - $tsize); |
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|
234 if ($fsize < $tsize) { |
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|
235 $code = "((($tctype) $code) << $shiftval)"; |
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|
236 } elsif ($fsize > $tsize) { |
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|
237 $code = "(($tctype) ($code >> $shiftval))"; |
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|
238 } |
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|
239 } |
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|
240 |
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|
241 my $swap = getSwapFunc($tsize, $tsigned, $tfloat, $tendian, 'val'); |
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|
242 |
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|
243 print <<EOF; |
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|
244 const $tctype val = $code; |
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245 *dst = ${swap}; |
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246 } |
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247 |
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248 EOF |
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249 |
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250 if ($fsize > $tsize) { |
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251 my $divby = $fsize / $tsize; |
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252 print(" cvt->len_cvt /= $divby;\n"); |
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253 } elsif ($fsize < $tsize) { |
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254 my $mult = $tsize / $fsize; |
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255 print(" cvt->len_cvt *= $mult;\n"); |
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256 } |
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257 |
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258 print <<EOF; |
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259 format = AUDIO_$to; |
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260 if (cvt->filters[++cvt->filter_index]) { |
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261 cvt->filters[cvt->filter_index] (cvt, format); |
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262 } |
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263 } |
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264 |
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265 EOF |
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266 |
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267 } else { |
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268 if ($fsigned != $tsigned) { |
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269 $funcs{$hashid} = 'SDL_ConvertSigned'; |
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270 } elsif ($ffloat != $tfloat) { |
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271 $funcs{$hashid} = 'SDL_ConvertFloat'; |
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272 } elsif ($fsize != $tsize) { |
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273 $funcs{$hashid} = 'SDL_ConvertSize'; |
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274 } elsif ($fendian ne $tendian) { |
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275 $funcs{$hashid} = 'SDL_ConvertEndian'; |
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276 } else { |
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277 die("error in script.\n"); |
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278 } |
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279 } |
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280 } |
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281 |
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282 outputHeader(); |
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283 |
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284 foreach (@audiotypes) { |
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285 my $from = $_; |
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286 foreach (@audiotypes) { |
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287 my $to = $_; |
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288 buildCvtFunc($from, $to); |
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289 } |
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290 } |
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291 |
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292 print <<EOF; |
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293 const SDL_AudioTypeFilters sdl_audio_type_filters[] = |
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294 { |
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295 EOF |
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296 |
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297 foreach (@audiotypes) { |
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298 my $from = $_; |
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299 foreach (@audiotypes) { |
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300 my $to = $_; |
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301 if ($from ne $to) { |
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302 my $hashid = "$from/$to"; |
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303 my $sym = $funcs{$hashid}; |
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304 print(" { AUDIO_$from, AUDIO_$to, $sym },\n"); |
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305 } |
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306 } |
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307 } |
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308 |
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309 print <<EOF; |
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310 }; |
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311 |
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312 |
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313 EOF |
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314 |
1985
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Added source color and alpha modulation support.
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315 outputFooter(); |
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316 |
1982
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317 exit 0; |
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318 |
1985
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Added source color and alpha modulation support.
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319 # end of sdlgenaudiocvt.pl ... |
1982
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320 |