Added documentation of stage/TU allocation

http://codereview.appspot.com/6199058/



git-svn-id: http://skia.googlecode.com/svn/trunk@3888 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 5 insertions, 0 deletions

diff --git a/include/gpu/GrTextContext.h b/include/gpu/GrTextContext.h
index 588ae6ee34..ab1a344539 100644
--- a/include/gpu/GrTextContext.h
+++ b/include/gpu/GrTextContext.h
@@ -22,6 +22,11 @@ class GrPaint;
 class SkGpuDevice;
 class SkPaint;
 
+/**
+ * Derived classes can use stages GrPaint::kTotalStages through 
+ * GrDrawState::kNumStages-1. The stages before GrPaint::kTotalStages
+ * are reserved for setting up the draw (i.e., textures and filter masks).
+ */
 class GrTextContext: public GrRefCnt {
 protected:
     GrContext*      fContext;