Fix engine not starting on Windows if linked against SDL > 2.0.5

[xonotic/darkplaces.git] / fogeval.pl

diff --git a/fogeval.pl b/fogeval.pl
index a3633203fbcab438ba6b9edf79934589c3658c62..fe4d0523f5a8dd1fe7cd95ee9499dc18f05b8fe3 100644 (file)
--- a/fogeval.pl
+++ b/fogeval.pl
@@ -31,27 +31,48 @@ sub evalblend($$$$$$)
 sub isinvariant($$$$)
 {
        my ($fs, $fd, $s, $sa) = @_;
-       my ($d, $da) = (0.7823, 0.3289);
+       my ($d, $da) = (rand, rand);
        my ($out, $outa) = evalblend $fs, $fd, $s, $sa, $d, $da;
-       return abs($out - $d) < 0.001 && abs($outa - $da) < 0.001;
+       return abs($out - $d) < 0.0001 && abs($outa - $da) < 0.0001;
 }
 
 sub isfogfriendly($$$$$)
 {
        my ($fs, $fd, $s, $sa, $foghack) = @_;
-       my ($d, $da) = (0.7823, 0.3289);
-       my $fogamount = 0.3237;
-       my $fogcolor = 0.8612;
+       my ($d, $da) = (rand, rand);
+       my $fogamount = rand;
+       my $fogcolor = rand;
 
        # compare:
        # 1. blend(fog(s), sa, fog(d), da)
        # 2. fog(blend(s, sa, d, da))
 
-       my ($out1, $out1a) = evalblend $fs, $fd, $s + ((defined $foghack ? $foghack < 0 ? $s : $foghack : $fogcolor) - $s) * $fogamount, $sa, $d + ($fogcolor - $d) * $fogamount, $da;
+       my ($out1, $out1a) = evalblend $fs, $fd, $s + ((defined $foghack ? $foghack eq 'ALPHA' ? $fogcolor*$sa : $foghack : $fogcolor) - $s) * $fogamount, $sa, $d + ($fogcolor - $d) * $fogamount, $da;
        my ($out2, $out2a) = evalblend $fs, $fd, $s, $sa, $d, $da;
                $out2 = $out2 + ($fogcolor - $out2) * $fogamount;
 
-       return abs($out1 - $out2) < 0.001 && abs($out1a - $out2a) < 0.001;
+       return abs($out1 - $out2) < 0.0001 && abs($out1a - $out2a) < 0.0001;
+}
+
+use Carp;
+sub decide(&)
+{
+       my ($sub) = @_;
+       my $good = 0;
+       my $bad = 0;
+       for(;;)
+       {
+               for(1..200)
+               {
+                       my $r = $sub->();
+                       ++$good if $r;
+                       ++$bad if not $r;
+               }
+               #print STDERR "decide: $good vs $bad\n";
+               return 1 if $good > $bad + 150;
+               return 0 if $bad > $good + 150;
+               warn "No clear decision, continuing to test ($good : $bad)";
+       }
 }
 
 #die isfogfriendly $blendfuncs{GL_ONE}, $blendfuncs{GL_ONE}, 1, 0, 0;
@@ -65,9 +86,9 @@ sub willitblend($$)
        {
                for my $sa(0, 0.25, 0.5, 0.75, 1)
                {
-                       if(isinvariant($fs, $fd, $s, $sa))
+                       if(decide { isinvariant($fs, $fd, $s, $sa); })
                        {
-                               if(!isinvariant($fs, $fd, 0, $sa))
+                               if(!decide { isinvariant($fs, $fd, 0, $sa); })
                                {
                                        return 0; # no colormod possible
                                }
@@ -82,13 +103,13 @@ sub willitfog($$)
        my ($fs, $fd) = @_;
 
        FOGHACK:
-       for my $foghack(undef, 0, 1, -1)
+       for my $foghack(undef, 0, 'ALPHA')
        {
                for my $s(0, 0.25, 0.5, 0.75, 1)
                {
                        for my $sa(0, 0.25, 0.5, 0.75, 1)
                        {
-                               if(!isfogfriendly($fs, $fd, $s, $sa, $foghack))
+                               if(!decide { isfogfriendly($fs, $fd, $s, $sa, $foghack); })
                                {
                                        next FOGHACK;
                                }
@@ -104,6 +125,7 @@ for my $s(sort keys %blendfuncs)
 {
        for my $d(sort keys %blendfuncs)
        {
+               #print STDERR "$s $d\n";
                if(!willitblend $blendfuncs{$s}, $blendfuncs{$d})
                {
                        print "\tif(src == $s && dst == $d) r &= ~BLENDFUNC_ALLOWS_COLORMOD;\n";