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59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef WEBGLBINDABLENAME_H_
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#define WEBGLBINDABLENAME_H_
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#include "WebGLTypes.h"
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#include "GLDefs.h"
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#include "mozilla/TypeTraits.h"
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#include "mozilla/Assertions.h"
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namespace mozilla {
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/** Represents a GL name that can be bound to a target.
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*/
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template<typename T>
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class WebGLBindableName
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{
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public:
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WebGLBindableName()
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: mGLName(0)
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, mTarget(LOCAL_GL_NONE)
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{ }
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void BindTo(T target)
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{
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MOZ_ASSERT(target != LOCAL_GL_NONE, "Can't bind to GL_NONE.");
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MOZ_ASSERT(!HasEverBeenBound() || mTarget == target, "Rebinding is illegal.");
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bool targetChanged = (target != mTarget);
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mTarget = target;
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if (targetChanged)
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OnTargetChanged();
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}
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bool HasEverBeenBound() const { return mTarget != LOCAL_GL_NONE; }
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GLuint GLName() const { return mGLName; }
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T Target() const {
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MOZ_ASSERT(HasEverBeenBound());
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return mTarget;
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}
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protected:
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//! Called after mTarget has been changed by BindTo(target).
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virtual void OnTargetChanged() {}
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GLuint mGLName;
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T mTarget;
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};
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} // namespace mozilla
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#endif // !WEBGLBINDABLENAME_H_
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