61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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// TOGL CODE LICENSE
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//
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// Copyright 2011-2014 Valve Corporation
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// All Rights Reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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// intelglmallocworkaround.h
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// class responsible for setting up a malloc override that zeroes allocated
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// memory of less than 96 bytes. this is to work around a bug
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// in the Intel GLSL compiler on Mac OS X 10.8 due to uninitialized memory.
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//
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// 96 was chosen due to this quote from Apple:
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// "I verified that the size of the structure is exactly 64 bytes on 10.8.3, 10.8.4 and will be on 10.8.5."
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//
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// certain GLSL shaders would (intermittently) cause a crash the first time they
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// were drawn, and the bug has supposedly been fixed in 10.9, but is unlikely to
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// ever make it to 10.8.
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//
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//===============================================================================
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#ifndef INTELGLMALLOCWORKAROUND_H
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#define INTELGLMALLOCWORKAROUND_H
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#include <stdlib.h>
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class IntelGLMallocWorkaround
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{
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public:
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static IntelGLMallocWorkaround *Get();
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bool Enable();
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protected:
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IntelGLMallocWorkaround() :m_pfnMallocReentry(NULL) {}
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~IntelGLMallocWorkaround() {}
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static IntelGLMallocWorkaround *s_pWorkaround;
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static void* ZeroingAlloc(size_t);
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typedef void* (*pfnMalloc_t)(size_t);
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pfnMalloc_t m_pfnMallocReentry;
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};
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#endif // INTELGLMALLOCWORKAROUND_H
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