Buffer.cpp

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Author : Jamie Madill
Date : 2019-09-21 14:10:35
Hash : f703443b
Message : Use Resource IDs in RefCountObject. This lets us use strongly typed IDs pretty much everywhere. Only one or two additional places still use GLuint IDs. Mostly for external queries and for Framebuffer Attachments. With some clever type reflection helpers lets us define a single template function for handling operator== and != for resource IDs. Refactor in preparation for more Capture/Replay work. Bug: angleproject:3611 Change-Id: I1c0c848e89eb8a4b769714d57686f816daf01634 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1815550 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tobin Ehlis <tobine@google.com>
src/libANGLE/Buffer.cpp
//
// Copyright 2002 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, BufferID 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(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(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(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(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(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(angle::SubjectMessage::SubjectUnmapped);

    return angle::Result::Continue;
}

void Buffer::onDataChanged()
{
    mIndexRangeCache.clear();

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

    mImpl->onDataChanged();
}

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

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

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