71 lines
2.3 KiB
C++
71 lines
2.3 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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#include "intelglmallocworkaround.h"
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#include "mach_override.h"
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// memdbgon -must- be the last include file in a .cpp file.
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#include "tier0/memdbgon.h"
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IntelGLMallocWorkaround* IntelGLMallocWorkaround::s_pWorkaround = NULL;
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void *IntelGLMallocWorkaround::ZeroingAlloc(size_t size)
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{
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// We call into this pointer that resumes the original malloc.
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void *memory = s_pWorkaround->m_pfnMallocReentry(size);
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if (size < 96)
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{
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// Since the Intel driver has an issue with a small allocation
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// that's left uninitialized, we use memset to ensure it's zero-initialized.
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memset(memory, 0, size);
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}
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return memory;
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}
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IntelGLMallocWorkaround* IntelGLMallocWorkaround::Get()
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{
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if (!s_pWorkaround)
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{
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s_pWorkaround = new IntelGLMallocWorkaround();
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}
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return s_pWorkaround;
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}
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bool IntelGLMallocWorkaround::Enable()
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{
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if ( m_pfnMallocReentry != NULL )
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{
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return true;
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}
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mach_error_t error = mach_override_ptr( (void*)&malloc, (const void*)&ZeroingAlloc, (void**)&m_pfnMallocReentry );
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if ( error == err_cannot_override )
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{
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m_pfnMallocReentry = NULL;
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return false;
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}
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return true;
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} |