Add flag bits for partial GrContext reset

include/gpu/GrContext.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrContext_DEFINED
@@ skipping 39 matching lines @@
     static GrContext* Create(GrBackend, GrBackendContext);
 
     /**
      * Returns the number of GrContext instances for the current thread.
      */
     static int GetThreadInstanceCount();
 
     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.
      * The 'info' field is filled in with the 'info' passed to addCleanUp.
      */
     typedef void (*PFCleanUpFunc)(const GrContext* context, void* info);
 
     /**
      * Add a function to be called from within GrContext's destructor.
      * This gives classes a chance to free resources held on a per context basis.
@@ skipping 944 matching lines @@
     }
 
     GrTexture* texture() { return fTexture; }
 
 private:
     GrContext*                    fContext;
     GrTexture*                    fTexture;
 };
 
 #endif