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//
// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Buffer.cpp: Implements the gl::Buffer class, representing storage of vertex and/or
// index data. Implements GL buffer objects and related functionality.
// [OpenGL ES 2.0.24] section 2.9 page 21.
#include "libANGLE/Buffer.h"
#include "libANGLE/renderer/BufferImpl.h"
#include "libANGLE/renderer/Renderer.h"
namespace gl
{
Buffer::Buffer(rx::BufferImpl *impl, GLuint id)
: RefCountObject(id),
mBuffer(impl),
mLabel(),
mUsage(GL_STATIC_DRAW),
mSize(0),
mAccessFlags(0),
mAccess(GL_WRITE_ONLY_OES),
mMapped(GL_FALSE),
mMapPointer(NULL),
mMapOffset(0),
mMapLength(0)
{
}
Buffer::~Buffer()
{
SafeDelete(mBuffer);
}
void Buffer::setLabel(const std::string &label)
{
mLabel = label;
}
const std::string &Buffer::getLabel() const
{
return mLabel;
}
Error Buffer::bufferData(const void *data, GLsizeiptr size, GLenum usage)
{
gl::Error error = mBuffer->setData(data, size, usage);
if (error.isError())
{
return error;
}
mIndexRangeCache.clear();
mUsage = usage;
mSize = size;
return error;
}
Error Buffer::bufferSubData(const void *data, GLsizeiptr size, GLintptr offset)
{
gl::Error error = mBuffer->setSubData(data, size, offset);
if (error.isError())
{
return error;
}
mIndexRangeCache.invalidateRange(static_cast<unsigned int>(offset), static_cast<unsigned int>(size));
return error;
}
Error Buffer::copyBufferSubData(Buffer* source, GLintptr sourceOffset, GLintptr destOffset, GLsizeiptr size)
{
gl::Error error = mBuffer->copySubData(source->getImplementation(), sourceOffset, destOffset, size);
if (error.isError())
{
return error;
}
mIndexRangeCache.invalidateRange(static_cast<unsigned int>(destOffset), static_cast<unsigned int>(size));
return error;
}
Error Buffer::map(GLenum access)
{
ASSERT(!mMapped);
Error error = mBuffer->map(access, &mMapPointer);
if (error.isError())
{
mMapPointer = NULL;
return error;
}
ASSERT(access == GL_WRITE_ONLY_OES);
mMapped = GL_TRUE;
mMapOffset = 0;
mMapLength = mSize;
mAccess = access;
mAccessFlags = GL_MAP_WRITE_BIT;
mIndexRangeCache.clear();
return error;
}
Error Buffer::mapRange(GLintptr offset, GLsizeiptr length, GLbitfield access)
{
ASSERT(!mMapped);
ASSERT(offset + length <= mSize);
Error error = mBuffer->mapRange(offset, length, access, &mMapPointer);
if (error.isError())
{
mMapPointer = NULL;
return error;
}
mMapped = GL_TRUE;
mMapOffset = static_cast<GLint64>(offset);
mMapLength = static_cast<GLint64>(length);
mAccess = GL_WRITE_ONLY_OES;
mAccessFlags = access;
// The OES_mapbuffer extension states that GL_WRITE_ONLY_OES is the only valid
// value for GL_BUFFER_ACCESS_OES because it was written against ES2. Since there is
// no update for ES3 and the GL_READ_ONLY and GL_READ_WRITE enums don't exist for ES,
// we cannot properly set GL_BUFFER_ACCESS_OES when glMapBufferRange is called.
if ((access & GL_MAP_WRITE_BIT) > 0)
{
mIndexRangeCache.invalidateRange(static_cast<unsigned int>(offset), static_cast<unsigned int>(length));
}
return error;
}
Error Buffer::unmap(GLboolean *result)
{
ASSERT(mMapped);
Error error = mBuffer->unmap(result);
if (error.isError())
{
*result = GL_FALSE;
return error;
}
mMapped = GL_FALSE;
mMapPointer = NULL;
mMapOffset = 0;
mMapLength = 0;
mAccess = GL_WRITE_ONLY_OES;
mAccessFlags = 0;
return error;
}
void Buffer::onTransformFeedback()
{
mIndexRangeCache.clear();
}
void Buffer::onPixelUnpack()
{
mIndexRangeCache.clear();
}
Error Buffer::getIndexRange(GLenum type,
size_t offset,
size_t count,
bool primitiveRestartEnabled,
IndexRange *outRange) const
{
if (mIndexRangeCache.findRange(type, offset, count, primitiveRestartEnabled, outRange))
{
return gl::Error(GL_NO_ERROR);
}
Error error = mBuffer->getIndexRange(type, offset, count, primitiveRestartEnabled, outRange);
if (error.isError())
{
return error;
}
mIndexRangeCache.addRange(type, offset, count, primitiveRestartEnabled, *outRange);
return Error(GL_NO_ERROR);
}
}
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