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 "llfasttimer.h"
#include "llsys.h"
#include "llvertexbuffer.h"
// #include "llrender.h"
#include "llglheaders.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;
}

//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;
}


const U32 LL_VBO_BLOCK_SIZE = 2048;
const U32 LL_VBO_POOL_MAX_SEED_SIZE = 256*1024;

U32 vbo_block_size(U32 size)
{ //what block size will fit size?
	U32 mod = size % LL_VBO_BLOCK_SIZE;
	return mod == 0 ? size : size + (LL_VBO_BLOCK_SIZE-mod);
}

U32 vbo_block_index(U32 size)
{
	return vbo_block_size(size)/LL_VBO_BLOCK_SIZE;
}

const U32 LL_VBO_POOL_SEED_COUNT = vbo_block_index(LL_VBO_POOL_MAX_SEED_SIZE);


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

//static
LLVBOPool LLVertexBuffer::sStreamVBOPool(GL_STREAM_DRAW, GL_ARRAY_BUFFER);
LLVBOPool LLVertexBuffer::sDynamicVBOPool(GL_DYNAMIC_DRAW, GL_ARRAY_BUFFER);
LLVBOPool LLVertexBuffer::sDynamicCopyVBOPool(GL_DYNAMIC_COPY, GL_ARRAY_BUFFER);
LLVBOPool LLVertexBuffer::sStreamIBOPool(GL_STREAM_DRAW, GL_ELEMENT_ARRAY_BUFFER);
LLVBOPool LLVertexBuffer::sDynamicIBOPool(GL_DYNAMIC_DRAW, GL_ELEMENT_ARRAY_BUFFER);

U32 LLVBOPool::sBytesPooled = 0;
U32 LLVBOPool::sIndexBytesPooled = 0;

std::list<U32> LLVertexBuffer::sAvailableVAOName;
U32 LLVertexBuffer::sCurVAOName = 1;

U32 LLVertexBuffer::sAllocatedIndexBytes = 0;
U32 LLVertexBuffer::sIndexCount = 0;

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;
U32 LLVertexBuffer::sVertexCount = 0;
bool LLVertexBuffer::sMapped = false;
bool LLVertexBuffer::sUseStreamDraw = true;
bool LLVertexBuffer::sUseVAO = false;
bool LLVertexBuffer::sPreferStreamDraw = false;


U32 LLVBOPool::genBuffer()
{
	U32 ret = 0;

	glGenBuffers(1, &ret);
	
	return ret;
}

void LLVBOPool::deleteBuffer(U32 name)
{
	if (gGLManager.mInited)
	{
		LLVertexBuffer::unbind();

		glBindBuffer(mType, name);
		glBufferData(mType, 0, NULL, mUsage);
		glBindBuffer(mType, 0);

		glDeleteBuffers(1, &name);
	}
}


LLVBOPool::LLVBOPool(U32 vboUsage, U32 vboType)
: mUsage(vboUsage), mType(vboType)
{
	mMissCount.resize(LL_VBO_POOL_SEED_COUNT);
	std::fill(mMissCount.begin(), mMissCount.end(), 0);
}

volatile U8* LLVBOPool::allocate(U32& name, U32 size, bool for_seed)
{
	llassert(vbo_block_size(size) == size);
	
	volatile U8* ret = NULL;

	U32 i = vbo_block_index(size);

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

	if (mFreeList[i].empty() || for_seed)
	{
		//make a new buffer
		name = genBuffer();
		
		glBindBuffer(mType, name);

		if (!for_seed && i < LL_VBO_POOL_SEED_COUNT)
		{ //record this miss
			mMissCount[i]++;	
		}

		if (mType == GL_ARRAY_BUFFER)
		{
			LLVertexBuffer::sAllocatedBytes += size;
		}
		else
		{
			LLVertexBuffer::sAllocatedIndexBytes += size;
		}

		if (LLVertexBuffer::sDisableVBOMapping || mUsage != GL_DYNAMIC_DRAW)
		{
			glBufferData(mType, size, 0, mUsage);
			if (mUsage != GL_DYNAMIC_COPY)
			{ //data will be provided by application
				ret = (U8*) ll_aligned_malloc<64>(size);
				if (!ret)
				{
					LL_ERRS() << "Failed to allocate "<< size << " bytes for LLVBOPool buffer " << name <<"." << LL_NEWLINE
							  << "Free list size: " << mFreeList.size() // this happens if we are out of memory so a solution might be to clear some from freelist
							  << " Allocated Bytes: " << LLVertexBuffer::sAllocatedBytes
							  << " Allocated Index Bytes: " << LLVertexBuffer::sAllocatedIndexBytes
							  << " Pooled Bytes: " << sBytesPooled
							  << " Pooled Index Bytes: " << sIndexBytesPooled