llvertexbuffer.cpp

/** 
 * @file llvertexbuffer.cpp
 * @brief LLVertexBuffer implementation
 *
 * $LicenseInfo:firstyear=2003&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include <boost/static_assert.hpp>
#include "llsys.h"
#include "llvertexbuffer.h"
// #include "llrender.h"
#include "llglheaders.h"
#include "llmemtype.h"
#include "llrender.h"
#include "llvector4a.h"
#include "llshadermgr.h"
#include "llglslshader.h"
#include "llmemory.h"

//Next Highest Power Of Two
//helper function, returns first number > v that is a power of 2, or v if v is already a power of 2
U32 nhpo2(U32 v)
{
	U32 r = 1;
	while (r < v) {
		r *= 2;
	}
	return r;
}


//============================================================================

//static
LLVBOPool LLVertexBuffer::sStreamVBOPool;
LLVBOPool LLVertexBuffer::sDynamicVBOPool;
LLVBOPool LLVertexBuffer::sStreamIBOPool;
LLVBOPool LLVertexBuffer::sDynamicIBOPool;
U32 LLVBOPool::sBytesPooled = 0;

LLPrivateMemoryPool* LLVertexBuffer::sPrivatePoolp = NULL ;
U32 LLVertexBuffer::sBindCount = 0;
U32 LLVertexBuffer::sSetCount = 0;
S32 LLVertexBuffer::sCount = 0;
S32 LLVertexBuffer::sGLCount = 0;
S32 LLVertexBuffer::sMappedCount = 0;
BOOL LLVertexBuffer::sDisableVBOMapping = FALSE ;
BOOL LLVertexBuffer::sEnableVBOs = TRUE;
U32 LLVertexBuffer::sGLRenderBuffer = 0;
U32 LLVertexBuffer::sGLRenderArray = 0;
U32 LLVertexBuffer::sGLRenderIndices = 0;
U32 LLVertexBuffer::sLastMask = 0;
BOOL LLVertexBuffer::sVBOActive = FALSE;
BOOL LLVertexBuffer::sIBOActive = FALSE;
U32 LLVertexBuffer::sAllocatedBytes = 0;
BOOL LLVertexBuffer::sMapped = FALSE;
BOOL LLVertexBuffer::sUseStreamDraw = TRUE;
BOOL LLVertexBuffer::sUseVAO = FALSE;
BOOL LLVertexBuffer::sPreferStreamDraw = FALSE;

const U32 FENCE_WAIT_TIME_NANOSECONDS = 10000;  //1 ms

class LLGLSyncFence : public LLGLFence
{
public:
#ifdef GL_ARB_sync
	GLsync mSync;
#endif
	
	LLGLSyncFence()
	{
#ifdef GL_ARB_sync
		mSync = 0;
#endif
	}

	virtual ~LLGLSyncFence()
	{
#ifdef GL_ARB_sync
		if (mSync)
		{
			glDeleteSync(mSync);
		}
#endif
	}

	void placeFence()
	{
#ifdef GL_ARB_sync
		if (mSync)
		{
			glDeleteSync(mSync);
		}
		mSync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
#endif
	}

	void wait()
	{
#ifdef GL_ARB_sync
		if (mSync)
		{
			while (glClientWaitSync(mSync, 0, FENCE_WAIT_TIME_NANOSECONDS) == GL_TIMEOUT_EXPIRED)
			{ //track the number of times we've waited here
				static S32 waits = 0;
				waits++;
			}
		}
#endif
	}


};


//which power of 2 is i?
//assumes i is a power of 2 > 0
U32 wpo2(U32 i)
{
	llassert(i > 0);
	llassert(nhpo2(i) == i);

	U32 r = 0;

	while (i >>= 1) ++r;

	return r;
}

volatile U8* LLVBOPool::allocate(U32& name, U32 size)
{
	llassert(nhpo2(size) == size);

	U32 i = wpo2(size);

	if (mFreeList.size() <= i)
	{
		mFreeList.resize(i+1);
	}

	volatile U8* ret = NULL;

	if (mFreeList[i].empty())
	{
		//make a new buffer
		glGenBuffersARB(1, &name);
		glBindBufferARB(mType, name);
		glBufferDataARB(mType, size, 0, mUsage);
		LLVertexBuffer::sAllocatedBytes += size;

		if (LLVertexBuffer::sDisableVBOMapping || mUsage != GL_DYNAMIC_DRAW_ARB)
		{
			ret = (U8*) ll_aligned_malloc_16(size);
		}
		glBindBufferARB(mType, 0);
	}
	else
	{
		name = mFreeList[i].front().mGLName;
		ret = mFreeList[i].front().mClientData;

		sBytesPooled -= size;

		mFreeList[i].pop_front();
	}

	return ret;
}

void LLVBOPool::release(U32 name, volatile U8* buffer, U32 size)
{
	llassert(nhpo2(size) == size);

	U32 i = wpo2(size);

	llassert(mFreeList.size() > i);

	Record rec;
	rec.mGLName = name;