michael@0: #include "precompiled.h"
michael@0: //
michael@0: // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // IndexBuffer.cpp: Defines the abstract IndexBuffer class and IndexBufferInterface
michael@0: // class with derivations, classes that perform graphics API agnostic index buffer operations.
michael@0: 
michael@0: #include "libGLESv2/renderer/IndexBuffer.h"
michael@0: #include "libGLESv2/renderer/Renderer.h"
michael@0: 
michael@0: namespace rx
michael@0: {
michael@0: 
michael@0: unsigned int IndexBuffer::mNextSerial = 1;
michael@0: 
michael@0: IndexBuffer::IndexBuffer()
michael@0: {
michael@0:     updateSerial();
michael@0: }
michael@0: 
michael@0: IndexBuffer::~IndexBuffer()
michael@0: {
michael@0: }
michael@0: 
michael@0: unsigned int IndexBuffer::getSerial() const
michael@0: {
michael@0:     return mSerial;
michael@0: }
michael@0: 
michael@0: void IndexBuffer::updateSerial()
michael@0: {
michael@0:     mSerial = mNextSerial++;
michael@0: }
michael@0: 
michael@0: 
michael@0: IndexBufferInterface::IndexBufferInterface(Renderer *renderer, bool dynamic) : mRenderer(renderer)
michael@0: {
michael@0:     mIndexBuffer = renderer->createIndexBuffer();
michael@0: 
michael@0:     mDynamic = dynamic;
michael@0:     mWritePosition = 0;
michael@0: }
michael@0: 
michael@0: IndexBufferInterface::~IndexBufferInterface()
michael@0: {
michael@0:     if (mIndexBuffer)
michael@0:     {
michael@0:         delete mIndexBuffer;
michael@0:     }
michael@0: }
michael@0: 
michael@0: GLenum IndexBufferInterface::getIndexType() const
michael@0: {
michael@0:     return mIndexBuffer->getIndexType();
michael@0: }
michael@0: 
michael@0: unsigned int IndexBufferInterface::getBufferSize() const
michael@0: {
michael@0:     return mIndexBuffer->getBufferSize();
michael@0: }
michael@0: 
michael@0: unsigned int IndexBufferInterface::getSerial() const
michael@0: {
michael@0:     return mIndexBuffer->getSerial();
michael@0: }
michael@0: 
michael@0: bool IndexBufferInterface::mapBuffer(unsigned int size, void** outMappedMemory, unsigned int *streamOffset)
michael@0: {
michael@0:     // Protect against integer overflow
michael@0:     if (mWritePosition + size < mWritePosition)
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (!mIndexBuffer->mapBuffer(mWritePosition, size, outMappedMemory))
michael@0:     {
michael@0:         if (outMappedMemory)
michael@0:         {
michael@0:             *outMappedMemory = NULL;
michael@0:         }
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (streamOffset)
michael@0:     {
michael@0:         *streamOffset = mWritePosition;
michael@0:     }
michael@0: 
michael@0:     mWritePosition += size;
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool IndexBufferInterface::unmapBuffer()
michael@0: {
michael@0:     return mIndexBuffer->unmapBuffer();
michael@0: }
michael@0: 
michael@0: IndexBuffer * IndexBufferInterface::getIndexBuffer() const
michael@0: {
michael@0:     return mIndexBuffer;
michael@0: }
michael@0: 
michael@0: unsigned int IndexBufferInterface::getWritePosition() const
michael@0: {
michael@0:     return mWritePosition;
michael@0: }
michael@0: 
michael@0: void IndexBufferInterface::setWritePosition(unsigned int writePosition)
michael@0: {
michael@0:     mWritePosition = writePosition;
michael@0: }
michael@0: 
michael@0: bool IndexBufferInterface::discard()
michael@0: {
michael@0:     return mIndexBuffer->discard();
michael@0: }
michael@0: 
michael@0: bool IndexBufferInterface::setBufferSize(unsigned int bufferSize, GLenum indexType)
michael@0: {
michael@0:     if (mIndexBuffer->getBufferSize() == 0)
michael@0:     {
michael@0:         return mIndexBuffer->initialize(bufferSize, indexType, mDynamic);
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         return mIndexBuffer->setSize(bufferSize, indexType);
michael@0:     }
michael@0: }
michael@0: 
michael@0: StreamingIndexBufferInterface::StreamingIndexBufferInterface(Renderer *renderer) : IndexBufferInterface(renderer, true)
michael@0: {
michael@0: }
michael@0: 
michael@0: StreamingIndexBufferInterface::~StreamingIndexBufferInterface()
michael@0: {
michael@0: }
michael@0: 
michael@0: bool StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
michael@0: {
michael@0:     bool result = true;
michael@0:     unsigned int curBufferSize = getBufferSize();
michael@0:     unsigned int writePos = getWritePosition();
michael@0:     if (size > curBufferSize)
michael@0:     {
michael@0:         result = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
michael@0:         setWritePosition(0);
michael@0:     }
michael@0:     else if (writePos + size > curBufferSize || writePos + size < writePos)
michael@0:     {
michael@0:         if (!discard())
michael@0:         {
michael@0:             return false;
michael@0:         }
michael@0:         setWritePosition(0);
michael@0:     }
michael@0: 
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: 
michael@0: StaticIndexBufferInterface::StaticIndexBufferInterface(Renderer *renderer) : IndexBufferInterface(renderer, false)
michael@0: {
michael@0: }
michael@0: 
michael@0: StaticIndexBufferInterface::~StaticIndexBufferInterface()
michael@0: {
michael@0: }
michael@0: 
michael@0: bool StaticIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
michael@0: {
michael@0:     unsigned int curSize = getBufferSize();
michael@0:     if (curSize == 0)
michael@0:     {
michael@0:         return setBufferSize(size, indexType);
michael@0:     }
michael@0:     else if (curSize >= size && indexType == getIndexType())
michael@0:     {
michael@0:         return true;
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         ERR("Static index buffers can't be resized");
michael@0:         UNREACHABLE();
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: IndexRangeCache *StaticIndexBufferInterface::getIndexRangeCache()
michael@0: {
michael@0:     return &mIndexRangeCache;
michael@0: }
michael@0: 
michael@0: }
michael@0: