/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef WebGLProgram_h
#define WebGLProgram_h

#include "bindings/core/v8/TraceWrapperMember.h"
#include "modules/webgl/WebGLShader.h"
#include "modules/webgl/WebGLSharedPlatform3DObject.h"
#include "wtf/PassRefPtr.h"
#include "wtf/Vector.h"

namespace blink {

class WebGLProgram final : public WebGLSharedPlatform3DObject {
  DEFINE_WRAPPERTYPEINFO();

 public:
  ~WebGLProgram() override;

  static WebGLProgram* create(WebGLRenderingContextBase*);

  bool linkStatus(WebGLRenderingContextBase*);

  unsigned linkCount() const { return m_linkCount; }

  // This is to be called everytime after the program is successfully linked.
  // We don't deal with integer overflow here, assuming in reality a program
  // will never be linked so many times.
  // Also, we invalidate the cached program info.
  void increaseLinkCount();

  unsigned activeTransformFeedbackCount() const {
    return m_activeTransformFeedbackCount;
  }
  void increaseActiveTransformFeedbackCount();
  void decreaseActiveTransformFeedbackCount();

  WebGLShader* getAttachedShader(GLenum);
  bool attachShader(WebGLShader*);
  bool detachShader(WebGLShader*);

  virtual void visitChildDOMWrappers(v8::Isolate*,
                                     const v8::Persistent<v8::Object>&);

  DECLARE_VIRTUAL_TRACE();
  DECLARE_VIRTUAL_TRACE_WRAPPERS();

 protected:
  explicit WebGLProgram(WebGLRenderingContextBase*);

  void deleteObjectImpl(gpu::gles2::GLES2Interface*) override;

 private:
  bool isProgram() const override { return true; }

  void cacheInfoIfNeeded(WebGLRenderingContextBase*);

  GLint m_linkStatus;

  // This is used to track whether a WebGLUniformLocation belongs to this
  // program or not.
  unsigned m_linkCount;

  // This is used to track the program being used by active transform
  // feedback objects.
  unsigned m_activeTransformFeedbackCount;

  TraceWrapperMember<WebGLShader> m_vertexShader;
  TraceWrapperMember<WebGLShader> m_fragmentShader;

  bool m_infoValid;
};

}  // namespace blink

#endif  // WebGLProgram_h