--- deliantra/Deliantra-Client/DC/OpenGL.pm	2007/08/19 12:56:24	1.9
+++ deliantra/Deliantra-Client/DC/OpenGL.pm	2007/08/19 14:09:28	1.10
@@ -10,6 +10,7 @@
 
 our $GL_NPOT;
 our $GL_COMPRESS;
+our $GL_BFSEP; # blendfuncseparate
 
 our $DEBUG = 1;
 our %INIT_HOOK;
@@ -29,17 +30,34 @@
 }
 
 sub init {
+   $GL_VERSION = gl_version * 1;
+   %GL_EXT = map +($_ => 1), split /\s+/, gl_extensions;
+
+   unless (defined $::CFG->{force_opengl11}) {
+      # try to find a suitable default
+      if (
+         $GL_VERSION >= 2.0
+         && (!$GL_EXT{GL_ARB_texture_non_power_of_two}
+             || !$GL_EXT{GL_EXT_blend_func_separate})
+     ) {
+        $::CFG->{force_opengl11} = 1;
+     } else {
+        $::CFG->{force_opengl11} = 0;
+     }
+   }
+
    if ($::CFG->{force_opengl11}) {
       $GL_VERSION = 1.1;
       %GL_EXT = ();
-   } else {
-      $GL_VERSION = gl_version * 1;
-      %GL_EXT = map +($_ => 1), split /\s+/, gl_extensions;
    }
 
+   $GL_BFSEP    = $GL_EXT{GL_EXT_blend_func_separate}      || $GL_VERSION >= 2.0;
    $GL_NPOT     = $GL_EXT{GL_ARB_texture_non_power_of_two} || $GL_VERSION >= 2.0;
    $GL_COMPRESS = $GL_EXT{GL_ARB_texture_compression}      || $GL_VERSION >= 1.3;
 
+   disable_GL_EXT_blend_func_separate
+      unless $GL_BFSEP;
+
    glDisable GL_COLOR_MATERIAL;
    glShadeModel GL_FLAT;
    glDisable GL_DITHER;