The Tor Browser: content/canvas/src/WebGLElementArrayCache.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef WEBGLELEMENTARRAYCACHE_H

     7 #define WEBGLELEMENTARRAYCACHE_H

     9 #include "mozilla/MemoryReporting.h"

    10 #include <stdint.h>

    11 #include "nscore.h"

    12 #include "GLDefs.h"

    14 namespace mozilla {

    16 template<typename T>

    17 struct WebGLElementArrayCacheTree;

    19 /*

    20  * WebGLElementArrayCache implements WebGL element array buffer validation for drawElements.

    21  *

    22  * Its exposes methods meant to be called by WebGL method implementations:

    23  *  - Validate, to be called by WebGLContext::DrawElements, is where we use the cache

    24  *  - BufferData and BufferSubData, to be called by eponymous WebGL methods, are how

    25  *    data is fed into the cache

    26  *

    27  * Most of the implementation is hidden in the auxilary class template, WebGLElementArrayCacheTree.

    28  * Refer to its code for design comments.

    29  */

    30 class WebGLElementArrayCache {

    32 public:

    33   bool BufferData(const void* ptr, size_t byteSize);

    34   void BufferSubData(size_t pos, const void* ptr, size_t updateByteSize);

    36   bool Validate(GLenum type, uint32_t maxAllowed, size_t first, size_t count,

    37                 uint32_t* out_upperBound = nullptr);

    39   template<typename T>

    40   T Element(size_t i) const { return Elements<T>()[i]; }

    42   WebGLElementArrayCache()

    43     : mUntypedData(nullptr)

    44     , mByteSize(0)

    45     , mUint8Tree(nullptr)

    46     , mUint16Tree(nullptr)

    47     , mUint32Tree(nullptr)

    48   {}

    50   ~WebGLElementArrayCache();

    52   size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

    54 private:

    56   template<typename T>

    57   bool Validate(uint32_t maxAllowed, size_t first, size_t count,

    58                 uint32_t* out_upperBound);

    60   size_t ByteSize() const {

    61     return mByteSize;

    62   }

    64   template<typename T>

    65   const T* Elements() const { return static_cast<const T*>(mUntypedData); }

    66   template<typename T>

    67   T* Elements() { return static_cast<T*>(mUntypedData); }

    69   void InvalidateTrees(size_t firstByte, size_t lastByte);

    71   template<typename T>

    72   friend struct WebGLElementArrayCacheTree;

    73   template<typename T>

    74   friend struct TreeForType;

    76   void* mUntypedData;

    77   size_t mByteSize;

    78   WebGLElementArrayCacheTree<uint8_t>* mUint8Tree;

    79   WebGLElementArrayCacheTree<uint16_t>* mUint16Tree;

    80   WebGLElementArrayCacheTree<uint32_t>* mUint32Tree;

    81 };

    84 } // end namespace mozilla

    86 #endif // WEBGLELEMENTARRAYCACHE_H

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