253 lines
7.8 KiB
C++
253 lines
7.8 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* encapsulation of VBOs with batching and sharing
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*/
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#include "precompiled.h"
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#include "ps/Errors.h"
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#include "lib/ogl.h"
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#include "lib/sysdep/cpu.h"
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#include "Renderer.h"
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#include "VertexBuffer.h"
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#include "VertexBufferManager.h"
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#include "ps/CLogger.h"
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ERROR_GROUP(Renderer);
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ERROR_TYPE(Renderer, VBOFailed);
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///////////////////////////////////////////////////////////////////////////////
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// shared list of all free batch objects
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std::vector<CVertexBuffer::Batch *> CVertexBuffer::m_FreeBatches;
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// NOTE: This global variable is here (as opposed to in VertexBufferManager.cpp,
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// as would be logical) to make sure that m_FreeBatches is freed in the right
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// order relative to the VertexBufferManager
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CVertexBufferManager g_VBMan;
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///////////////////////////////////////////////////////////////////////////////
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// Call at shutdown to free memory
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void CVertexBuffer::Shutdown()
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{
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for(std::vector<Batch*>::iterator iter=m_FreeBatches.begin();iter!=m_FreeBatches.end();++iter)
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{
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delete *iter;
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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// CVertexBuffer constructor
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CVertexBuffer::CVertexBuffer(size_t vertexSize,bool dynamic)
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: m_VertexSize(vertexSize), m_Handle(0), m_SysMem(0), m_Dynamic(dynamic)
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{
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size_t size = MAX_VB_SIZE_BYTES;
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// allocate raw buffer
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if (g_Renderer.m_Caps.m_VBO) {
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// TODO: Detect when VBO failed, then fall back to system memory
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// (and copy all old VBOs into there, because it needs to be
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// consistent).
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// (PT: Disabled the VBOFailed test because it's not very useful at the
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// moment (it'll just cause the program to terminate, and I don't think
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// it has ever helped to discover any problems, and a later ogl_WarnIfError()
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// will tell us if there were any VBO issues anyway), and so it's a
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// waste of time to call glGetError so frequently.)
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// glGetError(); // clear the error state
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pglGenBuffersARB(1, &m_Handle);
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pglBindBufferARB(GL_ARRAY_BUFFER_ARB, m_Handle);
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// if (glGetError() != GL_NO_ERROR) throw PSERROR_Renderer_VBOFailed();
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pglBufferDataARB(GL_ARRAY_BUFFER_ARB, size, 0, m_Dynamic ? GL_DYNAMIC_DRAW_ARB : GL_STATIC_DRAW_ARB);
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// if (glGetError() != GL_NO_ERROR) throw PSERROR_Renderer_VBOFailed();
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pglBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
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} else {
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m_SysMem=new u8[size];
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}
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// store max/free vertex counts
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m_MaxVertices=m_FreeVertices=size/vertexSize;
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// create sole free chunk
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VBChunk* chunk=new VBChunk;
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chunk->m_Owner=this;
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chunk->m_Count=m_FreeVertices;
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chunk->m_Index=0;
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m_FreeList.push_front(chunk);
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}
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///////////////////////////////////////////////////////////////////////////////
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// CVertexBuffer destructor
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CVertexBuffer::~CVertexBuffer()
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{
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if (m_Handle) {
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pglDeleteBuffersARB(1,&m_Handle);
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} else if (m_SysMem) {
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delete[] m_SysMem;
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}
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// janwas 2004-06-14: release freelist
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typedef std::list<VBChunk*>::iterator Iter;
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for(Iter iter=m_FreeList.begin();iter!=m_FreeList.end();++iter)
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delete *iter;
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}
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///////////////////////////////////////////////////////////////////////////////
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// Allocate: try to allocate a buffer of given number of vertices (each of
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// given size), with the given type, and using the given texture - return null
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// if no free chunks available
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CVertexBuffer::VBChunk* CVertexBuffer::Allocate(size_t vertexSize,size_t numVertices,bool dynamic)
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{
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// check this is the right kind of buffer
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if (dynamic!=m_Dynamic || vertexSize!=m_VertexSize) return 0;
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// quick check there's enough vertices spare to allocate
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if (numVertices>m_FreeVertices) return 0;
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// trawl free list looking for first free chunk with enough space
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VBChunk* chunk=0;
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typedef std::list<VBChunk*>::iterator Iter;
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for (Iter iter=m_FreeList.begin();iter!=m_FreeList.end();++iter) {
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if (numVertices<=(*iter)->m_Count) {
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chunk=*iter;
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// remove this chunk from the free list
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m_FreeList.erase(iter);
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// no need to search further ..
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break;
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}
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}
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if (!chunk) {
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// no big enough spare chunk available
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return 0;
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}
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// split chunk into two; - allocate a new chunk using all unused vertices in the
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// found chunk, and add it to the free list
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if (chunk->m_Count > numVertices) {
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VBChunk* newchunk=new VBChunk;
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newchunk->m_Owner=this;
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newchunk->m_Count=chunk->m_Count-numVertices;
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newchunk->m_Index=chunk->m_Index+numVertices;
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m_FreeList.push_front(newchunk);
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// resize given chunk, resize total available free vertices
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chunk->m_Count=numVertices;
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m_FreeVertices-=numVertices;
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}
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// return found chunk
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return chunk;
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}
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///////////////////////////////////////////////////////////////////////////////
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// Release: return given chunk to this buffer
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void CVertexBuffer::Release(VBChunk* chunk)
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{
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// add to free list
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// TODO, RC - need to merge available chunks where possible to avoid
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// excessive fragmentation of vertex buffer space
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m_FreeList.push_front(chunk);
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m_FreeVertices+=chunk->m_Count;
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}
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///////////////////////////////////////////////////////////////////////////////
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// ClearBatchIndices: clear lists of all batches
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void CVertexBuffer::ClearBatchIndices()
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{
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for (size_t i=0;i<m_Batches.size();i++) {
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m_Batches[i]->m_IndexData.clear();
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m_FreeBatches.push_back(m_Batches[i]);
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}
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m_Batches.clear();
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}
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///////////////////////////////////////////////////////////////////////////////
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// AppendBatch: add a batch to the render list for this buffer
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void CVertexBuffer::AppendBatch(VBChunk* UNUSED(chunk),Handle texture,size_t numIndices,u16* indices)
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{
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// try and find a batch using this texture
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size_t i;
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Batch* batch=0;
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for (i=0;i<m_Batches.size();++i) {
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if (m_Batches[i]->m_Texture==texture) {
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batch=m_Batches[i];
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break;
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}
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}
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if (!batch) {
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if (m_FreeBatches.size()) {
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batch=m_FreeBatches.back();
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m_FreeBatches.pop_back();
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} else {
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batch=new Batch();
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}
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m_Batches.push_back(batch);
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batch->m_Texture=texture;
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}
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// resize the chunk's batch to fit its indices
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batch->m_IndexData.push_back(std::pair<size_t,u16*>(numIndices,indices));
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// memcpy(&batch->m_Indices[0]+cursize,indices,sizeof(u16)*numIndices);
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}
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///////////////////////////////////////////////////////////////////////////////
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// UpdateChunkVertices: update vertex data for given chunk
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void CVertexBuffer::UpdateChunkVertices(VBChunk* chunk,void* data)
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{
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if (g_Renderer.m_Caps.m_VBO) {
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debug_assert(m_Handle);
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// glGetError(); // clear the error state
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pglBindBufferARB(GL_ARRAY_BUFFER_ARB, m_Handle);
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pglBufferSubDataARB(GL_ARRAY_BUFFER_ARB, chunk->m_Index * m_VertexSize, chunk->m_Count * m_VertexSize, data);
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pglBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
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// if (glGetError() != GL_NO_ERROR) throw PSERROR_Renderer_VBOFailed();
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} else {
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debug_assert(m_SysMem);
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memcpy(m_SysMem + chunk->m_Index * m_VertexSize, data, chunk->m_Count * m_VertexSize);
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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// Bind: bind to this buffer; return pointer to address required as parameter
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// to glVertexPointer ( + etc) calls
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u8* CVertexBuffer::Bind()
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{
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u8* base;
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if (g_Renderer.m_Caps.m_VBO) {
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pglBindBufferARB(GL_ARRAY_BUFFER_ARB,m_Handle);
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base=(u8*) 0;
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} else {
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base=(u8*) m_SysMem;
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}
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return base;
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}
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void CVertexBuffer::Unbind()
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{
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if (g_Renderer.m_Caps.m_VBO) {
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pglBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
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}
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}
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