Added @todo and new extension.

src/Extensions.h

@@ -45,7 +45,9 @@ namespace Extensions {
     };
 namespace GL {
     #line 1
-    namespace APPLE {
+    namespace AMD {
+        _extension(GL,AMD,shader_trinary_minmax,        GL210,  None) // #428
+    } namespace APPLE {
         _extension(GL,APPLE,flush_buffer_range,         GL210, GL300) // #321
         _extension(GL,APPLE,vertex_array_object,        GL210, GL300) // #273
     } namespace ARB {

src/Mesh.h

@@ -93,6 +93,7 @@ more information.
 
 @requires_gl30 Extension @extension{EXT,gpu_shader4} (for unsigned integer attributes)
 
+@todo The attributes can be specified with different type than in shader - how?
 @todo Support for normalized values (e.g. for color as char[4] passed to
      shader as floating-point vec4)
 @todo Support for packed unsigned integer types for attributes (OpenGL 3.3, @extension{ARB,vertex_type_2_10_10_10_rev})