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: // VertexBuffer.cpp: Defines the abstract VertexBuffer class and VertexBufferInterface
michael@0: // class with derivations, classes that perform graphics API agnostic vertex buffer operations.
michael@0: 
michael@0: #include "libGLESv2/renderer/VertexBuffer.h"
michael@0: #include "libGLESv2/renderer/Renderer.h"
michael@0: #include "libGLESv2/Context.h"
michael@0: 
michael@0: namespace rx
michael@0: {
michael@0: 
michael@0: unsigned int VertexBuffer::mNextSerial = 1;
michael@0: 
michael@0: VertexBuffer::VertexBuffer()
michael@0: {
michael@0:     updateSerial();
michael@0: }
michael@0: 
michael@0: VertexBuffer::~VertexBuffer()
michael@0: {
michael@0: }
michael@0: 
michael@0: void VertexBuffer::updateSerial()
michael@0: {
michael@0:     mSerial = mNextSerial++;
michael@0: }
michael@0: 
michael@0: unsigned int VertexBuffer::getSerial() const
michael@0: {
michael@0:     return mSerial;
michael@0: }
michael@0: 
michael@0: VertexBufferInterface::VertexBufferInterface(rx::Renderer *renderer, bool dynamic) : mRenderer(renderer)
michael@0: {
michael@0:     mDynamic = dynamic;
michael@0:     mWritePosition = 0;
michael@0:     mReservedSpace = 0;
michael@0: 
michael@0:     mVertexBuffer = renderer->createVertexBuffer();
michael@0: }
michael@0: 
michael@0: VertexBufferInterface::~VertexBufferInterface()
michael@0: {
michael@0:     delete mVertexBuffer;
michael@0: }
michael@0: 
michael@0: unsigned int VertexBufferInterface::getSerial() const
michael@0: {
michael@0:     return mVertexBuffer->getSerial();
michael@0: }
michael@0: 
michael@0: unsigned int VertexBufferInterface::getBufferSize() const
michael@0: {
michael@0:     return mVertexBuffer->getBufferSize();
michael@0: }
michael@0: 
michael@0: bool VertexBufferInterface::setBufferSize(unsigned int size)
michael@0: {
michael@0:     if (mVertexBuffer->getBufferSize() == 0)
michael@0:     {
michael@0:         return mVertexBuffer->initialize(size, mDynamic);
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         return mVertexBuffer->setBufferSize(size);
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int VertexBufferInterface::getWritePosition() const
michael@0: {
michael@0:     return mWritePosition;
michael@0: }
michael@0: 
michael@0: void VertexBufferInterface::setWritePosition(unsigned int writePosition)
michael@0: {
michael@0:     mWritePosition = writePosition;
michael@0: }
michael@0: 
michael@0: bool VertexBufferInterface::discard()
michael@0: {
michael@0:     return mVertexBuffer->discard();
michael@0: }
michael@0: 
michael@0: bool VertexBufferInterface::storeVertexAttributes(const gl::VertexAttribute &attrib,  GLint start, GLsizei count, GLsizei instances,
michael@0:                                                   unsigned int *outStreamOffset)
michael@0: {
michael@0:     unsigned int spaceRequired;
michael@0:     if (!mVertexBuffer->getSpaceRequired(attrib, count, instances, &spaceRequired))
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (mWritePosition + spaceRequired < mWritePosition)
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (!reserveSpace(mReservedSpace))
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0:     mReservedSpace = 0;
michael@0: 
michael@0:     if (!mVertexBuffer->storeVertexAttributes(attrib, start, count, instances, mWritePosition))
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (outStreamOffset)
michael@0:     {
michael@0:         *outStreamOffset = mWritePosition;
michael@0:     }
michael@0: 
michael@0:     mWritePosition += spaceRequired;
michael@0: 
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool VertexBufferInterface::storeRawData(const void* data, unsigned int size, unsigned int *outStreamOffset)
michael@0: {
michael@0:     if (mWritePosition + size < mWritePosition)
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (!reserveSpace(mReservedSpace))
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0:     mReservedSpace = 0;
michael@0: 
michael@0:     if (!mVertexBuffer->storeRawData(data, size, mWritePosition))
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (outStreamOffset)
michael@0:     {
michael@0:         *outStreamOffset = mWritePosition;
michael@0:     }
michael@0: 
michael@0:     mWritePosition += size;
michael@0: 
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool VertexBufferInterface::reserveVertexSpace(const gl::VertexAttribute &attribute, GLsizei count, GLsizei instances)
michael@0: {
michael@0:     unsigned int requiredSpace;
michael@0:     if (!mVertexBuffer->getSpaceRequired(attribute, count, instances, &requiredSpace))
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     // Protect against integer overflow
michael@0:     if (mReservedSpace + requiredSpace < mReservedSpace)
michael@0:     {
michael@0:          return false;
michael@0:     }
michael@0: 
michael@0:     mReservedSpace += requiredSpace;
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: bool VertexBufferInterface::reserveRawDataSpace(unsigned int size)
michael@0: {
michael@0:     // Protect against integer overflow
michael@0:     if (mReservedSpace + size < mReservedSpace)
michael@0:     {
michael@0:          return false;
michael@0:     }
michael@0: 
michael@0:     mReservedSpace += size;
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: VertexBuffer* VertexBufferInterface::getVertexBuffer() const
michael@0: {
michael@0:     return mVertexBuffer;
michael@0: }
michael@0: 
michael@0: 
michael@0: StreamingVertexBufferInterface::StreamingVertexBufferInterface(rx::Renderer *renderer, std::size_t initialSize) : VertexBufferInterface(renderer, true)
michael@0: {
michael@0:     setBufferSize(initialSize);
michael@0: }
michael@0: 
michael@0: StreamingVertexBufferInterface::~StreamingVertexBufferInterface()
michael@0: {
michael@0: }
michael@0: 
michael@0: bool StreamingVertexBufferInterface::reserveSpace(unsigned int size)
michael@0: {
michael@0:     bool result = true;
michael@0:     unsigned int curBufferSize = getBufferSize();
michael@0:     if (size > curBufferSize)
michael@0:     {
michael@0:         result = setBufferSize(std::max(size, 3 * curBufferSize / 2));
michael@0:         setWritePosition(0);
michael@0:     }
michael@0:     else if (getWritePosition() + size > curBufferSize)
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: StaticVertexBufferInterface::StaticVertexBufferInterface(rx::Renderer *renderer) : VertexBufferInterface(renderer, false)
michael@0: {
michael@0: }
michael@0: 
michael@0: StaticVertexBufferInterface::~StaticVertexBufferInterface()
michael@0: {
michael@0: }
michael@0: 
michael@0: bool StaticVertexBufferInterface::lookupAttribute(const gl::VertexAttribute &attribute, unsigned int *outStreamOffset)
michael@0: {
michael@0:     for (unsigned int element = 0; element < mCache.size(); element++)
michael@0:     {
michael@0:         if (mCache[element].type == attribute.mType &&
michael@0:             mCache[element].size == attribute.mSize &&
michael@0:             mCache[element].stride == attribute.stride() &&
michael@0:             mCache[element].normalized == attribute.mNormalized)
michael@0:         {
michael@0:             if (mCache[element].attributeOffset == attribute.mOffset % attribute.stride())
michael@0:             {
michael@0:                 if (outStreamOffset)
michael@0:                 {
michael@0:                     *outStreamOffset = mCache[element].streamOffset;
michael@0:                 }
michael@0:                 return true;
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool StaticVertexBufferInterface::reserveSpace(unsigned int size)
michael@0: {
michael@0:     unsigned int curSize = getBufferSize();
michael@0:     if (curSize == 0)
michael@0:     {
michael@0:         setBufferSize(size);
michael@0:         return true;
michael@0:     }
michael@0:     else if (curSize >= size)
michael@0:     {
michael@0:         return true;
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         UNREACHABLE();   // Static vertex buffers can't be resized
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool StaticVertexBufferInterface::storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count, GLsizei instances,
michael@0:                                                         unsigned int *outStreamOffset)
michael@0: {
michael@0:     unsigned int streamOffset;
michael@0:     if (VertexBufferInterface::storeVertexAttributes(attrib, start, count, instances, &streamOffset))
michael@0:     {
michael@0:         int attributeOffset = attrib.mOffset % attrib.stride();
michael@0:         VertexElement element = { attrib.mType, attrib.mSize, attrib.stride(), attrib.mNormalized, attributeOffset, streamOffset };
michael@0:         mCache.push_back(element);
michael@0: 
michael@0:         if (outStreamOffset)
michael@0:         {
michael@0:             *outStreamOffset = streamOffset;
michael@0:         }
michael@0: 
michael@0:         return true;
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: }