Add flag bits for partial GrContext reset

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 5c796b26c034833348014bf558b8d0700115aebf..7a18f7385e2402e9b9b001bc6f5c49ae8e7b31b3 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -57,12 +57,34 @@ public:
     virtual ~GrContext();
 
     /**
+     * We would move below enum to GrType.h if we are going to have multiple
+     * sets of flags, such as D3D.
+     */
+    enum GLBackendState {

[bsalomon, 2013/06/26 19:03:07]

Let's move it now so that we don't have to go back later and update callers to
convert from GrContext::kTextureBinding_GLBackendState to
kTextureBinding_GrGLBackendState.

+        kRenderTarget_GLBackendState     = 0x01 << 0,
+        kTextureBinding_GLBackendState   = 0x01 << 1,
+        // View state stands for scissor and viewport
+        kView_GLBackendState             = 0x01 << 2,
+        kBlend_GLBackendState            = 0x01 << 3,
+        kAA_GLBackendState               = 0x01 << 4,
+        kVertex_GLBackendState           = 0x01 << 5,
+        kStencil_GLBackendState          = 0x01 << 6,
+        kPixelStore_GLBackendState       = 0x01 << 7,
+        kProgram_GLBackendState          = 0x01 << 8,
+        kPathStencil_GLBackendState      = 0x01 << 9,
+        kMisc_GLBackendState             = 0x01 << 10,
+        kALL_GLBackendState              = 0xffff
+    };
+
+    /**
      * The GrContext normally assumes that no outsider is setting state
      * within the underlying 3D API's context/device/whatever. This call informs
      * the context that the state was modified and it should resend. Shouldn't
      * be called frequently for good performance.
+     * The flag bits, state, is dpendent on which backend is used by the
+     * context, either GL or D3D (possible in future).
      */
-    void resetContext();
+    void resetContext(uint32_t state = kALL_GLBackendState);
 
     /**
      * Callback function to allow classes to cleanup on GrContext destruction.