Buffer.cpp

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Author : Jamie Madill
Date : 2019-05-10 08:27:00
Hash : e4faae21
Message : Rename state change notification messages. This makes the style use CamelCase instead of ALL_CAPS. It also cleans up some of the naming. It also changes some uses of the messages in some of the objects to hopefully be more consistent. See the comments added to the enum SubjectMessage in Observer.h for more details. Bug: angleproject:3427 Change-Id: I6dff4f6d335ecf1a27e48df65743b1490bd3025a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1600411 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
src/libANGLE/Buffer.cpp
//
// 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/Context.h"
#include "libANGLE/renderer/BufferImpl.h"
#include "libANGLE/renderer/GLImplFactory.h"

namespace gl
{
namespace
{
constexpr angle::SubjectIndex kImplementationSubjectIndex = 0;
}  // anonymous namespace

BufferState::BufferState()
    : mLabel(),
      mUsage(BufferUsage::StaticDraw),
      mSize(0),
      mAccessFlags(0),
      mAccess(GL_WRITE_ONLY_OES),
      mMapped(GL_FALSE),
      mMapPointer(nullptr),
      mMapOffset(0),
      mMapLength(0),
      mBindingCount(0),
      mTransformFeedbackIndexedBindingCount(0),
      mTransformFeedbackGenericBindingCount(0)
{}

BufferState::~BufferState() {}

Buffer::Buffer(rx::GLImplFactory *factory, GLuint id)
    : RefCountObject(id),
      mImpl(factory->createBuffer(mState)),
      mImplObserver(this, kImplementationSubjectIndex)
{
    mImplObserver.bind(mImpl);
}

Buffer::~Buffer()
{
    SafeDelete(mImpl);
}

void Buffer::onDestroy(const Context *context)
{
    // In tests, mImpl might be null.
    if (mImpl)
        mImpl->destroy(context);
}

void Buffer::setLabel(const Context *context, const std::string &label)
{
    mState.mLabel = label;
}

const std::string &Buffer::getLabel() const
{
    return mState.mLabel;
}

angle::Result Buffer::bufferData(Context *context,
                                 BufferBinding target,
                                 const void *data,
                                 GLsizeiptr size,
                                 BufferUsage usage)
{
    const void *dataForImpl = data;

    // If we are using robust resource init, make sure the buffer starts cleared.
    // Note: the Context is checked for nullptr because of some testing code.
    // TODO(jmadill): Investigate lazier clearing.
    if (context && context->getState().isRobustResourceInitEnabled() && !data && size > 0)
    {
        angle::MemoryBuffer *scratchBuffer = nullptr;
        ANGLE_CHECK_GL_ALLOC(
            context, context->getZeroFilledBuffer(static_cast<size_t>(size), &scratchBuffer));
        dataForImpl = scratchBuffer->data();
    }

    ANGLE_TRY(mImpl->setData(context, target, dataForImpl, size, usage));

    mIndexRangeCache.clear();
    mState.mUsage = usage;
    mState.mSize  = size;

    // Notify when storage changes.
    onStateChange(context, angle::SubjectMessage::SubjectChanged);

    return angle::Result::Continue;
}

angle::Result Buffer::bufferSubData(const Context *context,
                                    BufferBinding target,
                                    const void *data,
                                    GLsizeiptr size,
                                    GLintptr offset)
{
    ANGLE_TRY(mImpl->setSubData(context, target, data, size, offset));

    mIndexRangeCache.invalidateRange(static_cast<unsigned int>(offset),
                                     static_cast<unsigned int>(size));

    // Notify when data changes.
    onStateChange(context, angle::SubjectMessage::ContentsChanged);

    return angle::Result::Continue;
}

angle::Result Buffer::copyBufferSubData(const Context *context,
                                        Buffer *source,
                                        GLintptr sourceOffset,
                                        GLintptr destOffset,
                                        GLsizeiptr size)
{
    ANGLE_TRY(
        mImpl->copySubData(context, source->getImplementation(), sourceOffset, destOffset, size));

    mIndexRangeCache.invalidateRange(static_cast<unsigned int>(destOffset),
                                     static_cast<unsigned int>(size));

    // Notify when data changes.
    onStateChange(context, angle::SubjectMessage::ContentsChanged);

    return angle::Result::Continue;
}

angle::Result Buffer::map(const Context *context, GLenum access)
{
    ASSERT(!mState.mMapped);

    mState.mMapPointer = nullptr;
    ANGLE_TRY(mImpl->map(context, access, &mState.mMapPointer));

    ASSERT(access == GL_WRITE_ONLY_OES);

    mState.mMapped      = GL_TRUE;
    mState.mMapOffset   = 0;
    mState.mMapLength   = mState.mSize;
    mState.mAccess      = access;
    mState.mAccessFlags = GL_MAP_WRITE_BIT;
    mIndexRangeCache.clear();

    // Notify when state changes.
    onStateChange(context, angle::SubjectMessage::SubjectMapped);

    return angle::Result::Continue;
}

angle::Result Buffer::mapRange(const Context *context,
                               GLintptr offset,
                               GLsizeiptr length,
                               GLbitfield access)
{
    ASSERT(!mState.mMapped);
    ASSERT(offset + length <= mState.mSize);

    mState.mMapPointer = nullptr;
    ANGLE_TRY(mImpl->mapRange(context, offset, length, access, &mState.mMapPointer));

    mState.mMapped      = GL_TRUE;
    mState.mMapOffset   = static_cast<GLint64>(offset);
    mState.mMapLength   = static_cast<GLint64>(length);
    mState.mAccess      = GL_WRITE_ONLY_OES;
    mState.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));
    }

    // Notify when state changes.
    onStateChange(context, angle::SubjectMessage::SubjectMapped);

    return angle::Result::Continue;
}

angle::Result Buffer::unmap(const Context *context, GLboolean *result)
{
    ASSERT(mState.mMapped);

    *result = GL_FALSE;
    ANGLE_TRY(mImpl->unmap(context, result));

    mState.mMapped      = GL_FALSE;
    mState.mMapPointer  = nullptr;
    mState.mMapOffset   = 0;
    mState.mMapLength   = 0;
    mState.mAccess      = GL_WRITE_ONLY_OES;
    mState.mAccessFlags = 0;

    // Notify when data changes.
    onStateChange(context, angle::SubjectMessage::SubjectUnmapped);

    return angle::Result::Continue;
}

void Buffer::onTransformFeedback(const Context *context)
{
    mIndexRangeCache.clear();

    // Notify when data changes.
    onStateChange(context, angle::SubjectMessage::ContentsChanged);
}

void Buffer::onPixelPack(const Context *context)
{
    mIndexRangeCache.clear();

    // Notify when data changes.
    onStateChange(context, angle::SubjectMessage::ContentsChanged);
}

angle::Result Buffer::getIndexRange(const gl::Context *context,
                                    DrawElementsType type,
                                    size_t offset,
                                    size_t count,
                                    bool primitiveRestartEnabled,
                                    IndexRange *outRange) const
{
    if (mIndexRangeCache.findRange(type, offset, count, primitiveRestartEnabled, outRange))
    {
        return angle::Result::Continue;
    }

    ANGLE_TRY(
        mImpl->getIndexRange(context, type, offset, count, primitiveRestartEnabled, outRange));

    mIndexRangeCache.addRange(type, offset, count, primitiveRestartEnabled, *outRange);

    return angle::Result::Continue;
}

GLint64 Buffer::getMemorySize() const
{
    GLint64 implSize = mImpl->getMemorySize();
    return implSize > 0 ? implSize : mState.mSize;
}

bool Buffer::isDoubleBoundForTransformFeedback() const
{
    return mState.mTransformFeedbackIndexedBindingCount > 1;
}

void Buffer::onTFBindingChanged(const Context *context, bool bound, bool indexed)
{
    ASSERT(bound || mState.mBindingCount > 0);
    mState.mBindingCount += bound ? 1 : -1;
    if (indexed)
    {
        ASSERT(bound || mState.mTransformFeedbackIndexedBindingCount > 0);
        mState.mTransformFeedbackIndexedBindingCount += bound ? 1 : -1;

        onStateChange(context, angle::SubjectMessage::BindingChanged);
    }
    else
    {
        mState.mTransformFeedbackGenericBindingCount += bound ? 1 : -1;
    }
}

void Buffer::onSubjectStateChange(const gl::Context *context,
                                  angle::SubjectIndex index,
                                  angle::SubjectMessage message)
{
    // Pass it along!
    ASSERT(index == kImplementationSubjectIndex);
    ASSERT(message == angle::SubjectMessage::SubjectChanged);
    onStateChange(context, angle::SubjectMessage::SubjectChanged);
}
}  // namespace gl
kc3-lang/angle/src/libANGLE/Buffer.cpp

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kc3-lang/angle /src/libANGLE/Buffer.cpp
