lib/gamnit: intro GamnitProgram::diagnose

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/gamnit/programs.nit b/lib/gamnit/programs.nit
index 1a995ef..6859c76 100644 (file)
--- a/lib/gamnit/programs.nit
+++ b/lib/gamnit/programs.nit
@@ -428,6 +428,23 @@ abstract class GamnitProgram
                end
        end
 
+       # Diagnose possible problems with the shaders of the program
+       #
+       # Lists to the console inactive uniforms and attributes.
+       # These may not be problematic but they can help to debug the program.
+       fun diagnose
+       do
+               if gl_program == null then compile_and_link
+
+               print "# Diagnose {class_name}"
+               for k,v in uniforms do
+                       if not v.is_active then print "* Uniform {v.name} is inactive"
+               end
+               for k,v in attributes do
+                       if not v.is_active then print "* Attribute {v.name} is inactive"
+               end
+       end
+
        # Attributes of this program organized by name
        #
        # Active attributes are gathered at `compile_and_link`.