75 lines
2.1 KiB
Perl
75 lines
2.1 KiB
Perl
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#! perl
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use Text::Wrap;
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use Math::Trig;
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# generate output data for noise generators
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srand(31456);
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print <<END
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//========= Copyright <EFBFBD> 1996-2006, Valve Corporation, All rights reserved. ============//
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//
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// Purpose: static data for noise() primitives.
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//
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// \$Workfile: \$
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// \$NoKeywords: \$
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//=============================================================================//
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//
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// **** DO NOT EDIT THIS FILE. GENERATED BY DATAGEN.PL ****
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//
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END
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;
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@perm_a=0..255;
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&fisher_yates_shuffle(\@perm_a);
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$Text::Wrap::Columns=78;
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$Text::Wrap::break=",";
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$Text::Wrap::separator=",\n";
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print "static int perm_a[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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&fisher_yates_shuffle(\@perm_a);
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print "static int perm_b[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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&fisher_yates_shuffle(\@perm_a);
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print "static int perm_c[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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&fisher_yates_shuffle(\@perm_a);
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print "static int perm_d[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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for ($i=0;$i<256;$i++)
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{
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$float_perm=(1.0/255.0)*$perm_a[$i];
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$perm_a[$i] = sprintf("%f",$float_perm);
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}
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&fisher_yates_shuffle(\@perm_a);
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print "static float impulse_xcoords[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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&fisher_yates_shuffle(\@perm_a);
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print "static float impulse_ycoords[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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&fisher_yates_shuffle(\@perm_a);
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print "static float impulse_zcoords[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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# now, generate 256 random gradient vectors
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for($i=0; $i < 256; $i++)
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{
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$z=rand(2)-1;
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$phi=rand(2.0*3.141592654);
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$theta=asin($z);
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$perm_a[$i]=sprintf("%f, %f, %f ", cos($theta)*cos($phi), cos($theat)*sin($phi), $z );
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}
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print "static float s_randomGradients[]={\n",wrap(' ',' ',join(",",@perm_a)),"\n};\n\n";
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# fisher_yates_shuffle( \@array ) : generate a random permutation
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# of @array in place
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sub fisher_yates_shuffle {
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my $array = shift;
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my $i;
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for ($i = @$array; --$i; ) {
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my $j = int rand ($i+1);
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next if $i == $j;
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@$array[$i,$j] = @$array[$j,$i];
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}
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}
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