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//========= Copyright Valve Corporation, All rights reserved. ============//
// TOGL CODE LICENSE
//
// Copyright 2011-2014 Valve Corporation
// All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "intelglmallocworkaround.h"
#include "mach_override.h"
// memdbgon -must- be the last include file in a .cpp file.
#include "tier0/memdbgon.h"
IntelGLMallocWorkaround* IntelGLMallocWorkaround::s_pWorkaround = NULL;
void *IntelGLMallocWorkaround::ZeroingAlloc(size_t size)
{
// We call into this pointer that resumes the original malloc.
void *memory = s_pWorkaround->m_pfnMallocReentry(size);
if (size < 96)
{
// Since the Intel driver has an issue with a small allocation
// that's left uninitialized, we use memset to ensure it's zero-initialized.
memset(memory, 0, size);
}
return memory;
}
IntelGLMallocWorkaround* IntelGLMallocWorkaround::Get()
{
if (!s_pWorkaround)
{
s_pWorkaround = new IntelGLMallocWorkaround();
}
return s_pWorkaround;
}
bool IntelGLMallocWorkaround::Enable()
{
if ( m_pfnMallocReentry != NULL )
{
return true;
}
mach_error_t error = mach_override_ptr( (void*)&malloc, (const void*)&ZeroingAlloc, (void**)&m_pfnMallocReentry );
if ( error == err_cannot_override )
{
m_pfnMallocReentry = NULL;
return false;
}
return true;
}
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