check for gl-canvas before calling GL

git-svn-id: http://skia.googlecode.com/svn/trunk@480 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 5 insertions, 3 deletions

diff --git a/samplecode/SampleTestGL.cpp b/samplecode/SampleTestGL.cpp
index 04e47b6b3e..c5938baabe 100644
--- a/samplecode/SampleTestGL.cpp
+++ b/samplecode/SampleTestGL.cpp
@@ -202,9 +202,11 @@ protected:
     
     virtual void onDraw(SkCanvas* canvas) {
         drawBG(canvas);
-        
-        test_glshader(canvas);
-        return;
+
+        if (canvas->getViewport(NULL)) {
+            test_glshader(canvas);
+            return;
+        }
         
         SkRect r;
         r.set(0, 0, 100, 100);