dom/canvas/WebGLBuffer.h
author Sylvestre Ledru <sledru@mozilla.com>
Thu, 17 Aug 2017 11:13:01 +0200
changeset 648192 c236dfe7dc98c387219d7cb45d0693560db708fd
parent 496429 539928251430c699369fcd5c60ef340ac42464af
permissions -rw-r--r--
indent all (with js specific coding style) MozReview-Commit-ID: LU1md2wyB8

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef WEBGL_BUFFER_H_
#define WEBGL_BUFFER_H_

#include <map>

#include "GLDefs.h"
#include "mozilla/LinkedList.h"
#include "nsWrapperCache.h"
#include "WebGLObjectModel.h"
#include "WebGLTypes.h"

namespace mozilla {

class WebGLBuffer final
  : public nsWrapperCache
  , public WebGLRefCountedObject<WebGLBuffer>
  , public LinkedListElement<WebGLBuffer>
{
  friend class WebGLContext;
  friend class WebGL2Context;
  friend class WebGLTexture;

public:
  enum class Kind
  {
    Undefined,
    ElementArray,
    OtherData
  };

  WebGLBuffer(WebGLContext* webgl, GLuint buf);

  void SetContentAfterBind(GLenum target);
  Kind Content() const { return mContent; }

  void Delete();

  size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;

  GLenum Usage() const { return mUsage; }
  size_t ByteLength() const { return mByteLength; }

  bool ValidateIndexedFetch(GLenum type,
                            uint32_t max_allowed,
                            size_t first,
                            size_t count) const;
  bool ValidateRange(const char* funcName,
                     size_t byteOffset,
                     size_t byteLen) const;

  WebGLContext* GetParentObject() const { return mContext; }

  virtual JSObject* WrapObject(JSContext* cx,
                               JS::Handle<JSObject*> givenProto) override;

  bool ValidateCanBindToTarget(const char* funcName, GLenum target);
  void BufferData(GLenum target, size_t size, const void* data, GLenum usage);
  void BufferSubData(GLenum target,
                     size_t dstByteOffset,
                     size_t dataLen,
                     const void* data) const;

  ////

  static void AddBindCount(GLenum target, WebGLBuffer* buffer, int8_t addVal)
  {
    if (!buffer)
      return;

    if (target == LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER) {
      MOZ_ASSERT_IF(addVal < 0, buffer->mTFBindCount >= size_t(-addVal));
      buffer->mTFBindCount += addVal;
    } else {
      MOZ_ASSERT_IF(addVal < 0, buffer->mNonTFBindCount >= size_t(-addVal));
      buffer->mNonTFBindCount += addVal;
    }
  }

  static void SetSlot(GLenum target,
                      WebGLBuffer* newBuffer,
                      WebGLRefPtr<WebGLBuffer>* const out_slot)
  {
    WebGLBuffer* const oldBuffer = *out_slot;
    AddBindCount(target, oldBuffer, -1);
    AddBindCount(target, newBuffer, +1);
    *out_slot = newBuffer;
  }

  bool IsBoundForTF() const { return bool(mTFBindCount); }
  bool IsBoundForNonTF() const { return bool(mNonTFBindCount); }

  ////

  const GLenum mGLName;

  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(WebGLBuffer)
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(WebGLBuffer)

protected:
  ~WebGLBuffer();

  void InvalidateCacheRange(size_t offset, size_t length) const;

  Kind mContent;
  GLenum mUsage;
  size_t mByteLength;
  size_t mTFBindCount;
  size_t mNonTFBindCount;

  struct IndexRange final
  {
    GLenum type;
    size_t first;
    size_t count;

    bool operator<(const IndexRange& x) const
    {
      if (type != x.type)
        return type < x.type;

      if (first != x.first)
        return first < x.first;

      return count < x.count;
    }
  };

  UniqueBuffer mIndexCache;
  mutable std::map<IndexRange, size_t> mIndexRanges;
};

} // namespace mozilla

#endif // WEBGL_BUFFER_H_