104 lines
3.5 KiB
C++
104 lines
3.5 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 WEBGL_ELEMENT_ARRAY_CACHE_H
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#define WEBGL_ELEMENT_ARRAY_CACHE_H
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#include "GLDefs.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Scoped.h"
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#include "nscore.h"
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#include "nsTArray.h"
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#include <stdint.h>
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namespace mozilla {
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template<typename T>
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struct WebGLElementArrayCacheTree;
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/* WebGLElementArrayCache implements WebGL element array buffer validation for
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* drawElements.
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*
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* Its exposes methods meant to be called by WebGL method implementations:
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*
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* - Validate, to be called by WebGLContext::DrawElements, is where we use the
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* cache.
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*
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* - BufferData and BufferSubData, to be called by eponymous WebGL methods, are
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* how data is fed into the cache.
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*
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* Most of the implementation is hidden in the auxilary class template,
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* WebGLElementArrayCacheTree. Refer to its code for design comments.
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*/
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class WebGLElementArrayCache {
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public:
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bool BufferData(const void* ptr, size_t byteLength);
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bool BufferSubData(size_t pos, const void* ptr, size_t updateByteSize);
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bool Validate(GLenum type, uint32_t maxAllowed, size_t first, size_t count,
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uint32_t* const out_upperBound);
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template<typename T>
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T Element(size_t i) const { return Elements<T>()[i]; }
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WebGLElementArrayCache();
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~WebGLElementArrayCache();
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
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bool BeenUsedWithMultipleTypes() const;
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private:
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/* Returns true if a drawElements call with the given parameters should
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* succeed, false otherwise.
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*
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* In other words, this returns true if all entries in the element array at
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* positions:
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*
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* first .. first+count-1
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*
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* are less than or equal to maxAllowed.
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*
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* Input parameters:
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* maxAllowed: Maximum value to be allowed in the specificied portion of
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* the element array.
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* first: Start of the portion of the element array to consume.
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* count: Number of entries from the element array to consume.
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*
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* Output parameter:
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* out_upperBound: Upon success, is set to the actual maximum value in the
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* specified range, which is then guaranteed to be less
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* than or equal to maxAllowed. upon failure, is set to
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* the first value in the specified range, that is greater
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* than maxAllowed.
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*/
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template<typename T>
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bool Validate(uint32_t maxAllowed, size_t first, size_t count,
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uint32_t* const out_upperBound);
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template<typename T>
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const T* Elements() const {
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return reinterpret_cast<const T*>(mBytes.Elements());
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}
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template<typename T>
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T* Elements() { return reinterpret_cast<T*>(mBytes.Elements()); }
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bool UpdateTrees(size_t firstByte, size_t lastByte);
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template<typename T>
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friend struct WebGLElementArrayCacheTree;
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template<typename T>
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friend struct TreeForType;
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FallibleTArray<uint8_t> mBytes;
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ScopedDeletePtr<WebGLElementArrayCacheTree<uint8_t>> mUint8Tree;
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ScopedDeletePtr<WebGLElementArrayCacheTree<uint16_t>> mUint16Tree;
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ScopedDeletePtr<WebGLElementArrayCacheTree<uint32_t>> mUint32Tree;
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};
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} // end namespace mozilla
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#endif // WEBGL_ELEMENT_ARRAY_CACHE_H
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