Validate bound buffer for draw calls

third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebGLVertexArrayObjectBase_h
 #define WebGLVertexArrayObjectBase_h
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "modules/webgl/WebGLBuffer.h"
 #include "modules/webgl/WebGLContextObject.h"
@@ skipping 15 matching lines @@
     bool isDefaultObject() const { return m_type == VaoTypeDefault; }
 
     bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }
     void setHasEverBeenBound() { m_hasEverBeenBound = true; }
 
     WebGLBuffer* boundElementArrayBuffer() const { return m_boundElementArrayBuffer; }
     void setElementArrayBuffer(WebGLBuffer*);
 
     WebGLBuffer* getArrayBufferForAttrib(size_t);
     void setArrayBufferForAttrib(GLuint, WebGLBuffer*);
+    void setAttribEnabled(GLuint, bool);
+    bool getAttribEnabled(GLuint) const;
+    bool isAllEnabledAttribBufferBound() const { return m_isAllEnabledAttribBufferBound; }
     void unbindBuffer(WebGLBuffer*);
 
     ScopedPersistent<v8::Array>* getPersistentCache();
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     WebGLVertexArrayObjectBase(WebGLRenderingContextBase*, VaoType);
 
 private:
     void dispatchDetached(gpu::gles2::GLES2Interface*);
     bool hasObject() const override { return m_object != 0; }
     void deleteObjectImpl(gpu::gles2::GLES2Interface*) override;
 
+    void updateAttribBufferBoundStatus();
+
     GLuint m_object;
 
     VaoType m_type;
     bool m_hasEverBeenBound;
     bool m_destructionInProgress;
     Member<WebGLBuffer> m_boundElementArrayBuffer;
     HeapVector<Member<WebGLBuffer>> m_arrayBufferList;
+    Vector<bool> m_attribEnabled;
+    bool m_isAllEnabledAttribBufferBound;
 
     // For preserving the wrappers of WebGLBuffer objects latched in
     // via vertexAttribPointer calls.
     ScopedPersistent<v8::Array> m_arrayBufferWrappers;
 };
 
 } // namespace blink
 
 #endif // WebGLVertexArrayObjectBase_h