1 files changed, 684 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/VertexDataManager.cpp b/gfx/angle/checkout/src/libANGLE/renderer/d3d/VertexDataManager.cpp
new file mode 100644
index 0000000000..43fcdc8de5
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/VertexDataManager.cpp
@@ -0,0 +1,684 @@
+//
+// 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.
+//
+
+// VertexDataManager.h: Defines the VertexDataManager, a class that
+// runs the Buffer translation process.
+
+#include "libANGLE/renderer/d3d/VertexDataManager.h"
+
+#include "common/bitset_utils.h"
+#include "libANGLE/Buffer.h"
+#include "libANGLE/Context.h"
+#include "libANGLE/Program.h"
+#include "libANGLE/State.h"
+#include "libANGLE/VertexArray.h"
+#include "libANGLE/VertexAttribute.h"
+#include "libANGLE/formatutils.h"
+#include "libANGLE/renderer/d3d/BufferD3D.h"
+#include "libANGLE/renderer/d3d/ContextD3D.h"
+#include "libANGLE/renderer/d3d/VertexBuffer.h"
+
+using namespace angle;
+
+namespace rx
+{
+namespace
+{
+enum
+{
+    INITIAL_STREAM_BUFFER_SIZE = 1024 * 1024
+};
+// This has to be at least 4k or else it fails on ATI cards.
+enum
+{
+    CONSTANT_VERTEX_BUFFER_SIZE = 4096
+};
+
+// Warning: ensure the binding matches attrib.bindingIndex before using these functions.
+int64_t GetMaxAttributeByteOffsetForDraw(const gl::VertexAttribute &attrib,
+                                         const gl::VertexBinding &binding,
+                                         int64_t elementCount)
+{
+    CheckedNumeric<int64_t> stride = ComputeVertexAttributeStride(attrib, binding);
+    CheckedNumeric<int64_t> offset = ComputeVertexAttributeOffset(attrib, binding);
+    CheckedNumeric<int64_t> size   = ComputeVertexAttributeTypeSize(attrib);
+
+    ASSERT(elementCount > 0);
+
+    CheckedNumeric<int64_t> result =
+        stride * (CheckedNumeric<int64_t>(elementCount) - 1) + size + offset;
+    return result.ValueOrDefault(std::numeric_limits<int64_t>::max());
+}
+
+// Warning: ensure the binding matches attrib.bindingIndex before using these functions.
+int ElementsInBuffer(const gl::VertexAttribute &attrib,
+                     const gl::VertexBinding &binding,
+                     unsigned int size)
+{
+    // Size cannot be larger than a GLsizei
+    if (size > static_cast<unsigned int>(std::numeric_limits<int>::max()))
+    {
+        size = static_cast<unsigned int>(std::numeric_limits<int>::max());
+    }
+
+    GLsizei stride = static_cast<GLsizei>(ComputeVertexAttributeStride(attrib, binding));
+    GLsizei offset = static_cast<GLsizei>(ComputeVertexAttributeOffset(attrib, binding));
+    return (size - offset % stride +
+            (stride - static_cast<GLsizei>(ComputeVertexAttributeTypeSize(attrib)))) /
+           stride;
+}
+
+// Warning: you should ensure binding really matches attrib.bindingIndex before using this function.
+bool DirectStoragePossible(const gl::Context *context,
+                           const gl::VertexAttribute &attrib,
+                           const gl::VertexBinding &binding)
+{
+    // Current value attribs may not use direct storage.
+    if (!attrib.enabled)
+    {
+        return false;
+    }
+
+    gl::Buffer *buffer = binding.getBuffer().get();
+    if (!buffer)
+    {
+        return false;
+    }
+
+    BufferD3D *bufferD3D = GetImplAs<BufferD3D>(buffer);
+    ASSERT(bufferD3D);
+    if (!bufferD3D->supportsDirectBinding())
+    {
+        return false;
+    }
+
+    // Alignment restrictions: In D3D, vertex data must be aligned to the format stride, or to a
+    // 4-byte boundary, whichever is smaller. (Undocumented, and experimentally confirmed)
+    size_t alignment = 4;
+
+    // TODO(jmadill): add VertexFormatCaps
+    BufferFactoryD3D *factory = bufferD3D->getFactory();
+
+    angle::FormatID vertexFormatID = attrib.format->id;
+
+    // CPU-converted vertex data must be converted (naturally).
+    if ((factory->getVertexConversionType(vertexFormatID) & VERTEX_CONVERT_CPU) != 0)
+    {
+        return false;
+    }
+
+    if (attrib.format->vertexAttribType != gl::VertexAttribType::Float)
+    {
+        unsigned int elementSize = 0;
+        angle::Result error =
+            factory->getVertexSpaceRequired(context, attrib, binding, 1, 0, 0, &elementSize);
+        ASSERT(error == angle::Result::Continue);
+        alignment = std::min<size_t>(elementSize, 4);
+    }
+
+    GLintptr offset = ComputeVertexAttributeOffset(attrib, binding);
+    // Final alignment check - unaligned data must be converted.
+    return (static_cast<size_t>(ComputeVertexAttributeStride(attrib, binding)) % alignment == 0) &&
+           (static_cast<size_t>(offset) % alignment == 0);
+}
+}  // anonymous namespace
+
+TranslatedAttribute::TranslatedAttribute()
+    : active(false),
+      attribute(nullptr),
+      binding(nullptr),
+      currentValueType(gl::VertexAttribType::InvalidEnum),
+      baseOffset(0),
+      usesFirstVertexOffset(false),
+      stride(0),
+      vertexBuffer(),
+      storage(nullptr),
+      serial(0),
+      divisor(0)
+{}
+
+TranslatedAttribute::TranslatedAttribute(const TranslatedAttribute &other) = default;
+
+angle::Result TranslatedAttribute::computeOffset(const gl::Context *context,
+                                                 GLint startVertex,
+                                                 unsigned int *offsetOut) const
+{
+    if (!usesFirstVertexOffset)
+    {
+        *offsetOut = baseOffset;
+        return angle::Result::Continue;
+    }
+
+    CheckedNumeric<unsigned int> offset(baseOffset);
+    CheckedNumeric<unsigned int> checkedStride(stride);
+
+    offset += checkedStride * static_cast<unsigned int>(startVertex);
+    ANGLE_CHECK_GL_MATH(GetImplAs<ContextD3D>(context), offset.IsValid());
+    *offsetOut = offset.ValueOrDie();
+    return angle::Result::Continue;
+}
+
+// Warning: you should ensure binding really matches attrib.bindingIndex before using this function.
+VertexStorageType ClassifyAttributeStorage(const gl::Context *context,
+                                           const gl::VertexAttribute &attrib,
+                                           const gl::VertexBinding &binding)
+{
+    // If attribute is disabled, we use the current value.
+    if (!attrib.enabled)
+    {
+        return VertexStorageType::CURRENT_VALUE;
+    }
+
+    // If specified with immediate data, we must use dynamic storage.
+    gl::Buffer *buffer = binding.getBuffer().get();
+    if (!buffer)
+    {
+        return VertexStorageType::DYNAMIC;
+    }
+
+    // Check if the buffer supports direct storage.
+    if (DirectStoragePossible(context, attrib, binding))
+    {
+        return VertexStorageType::DIRECT;
+    }
+
+    // Otherwise the storage is static or dynamic.
+    BufferD3D *bufferD3D = GetImplAs<BufferD3D>(buffer);
+    ASSERT(bufferD3D);
+    switch (bufferD3D->getUsage())
+    {
+        case D3DBufferUsage::DYNAMIC:
+            return VertexStorageType::DYNAMIC;
+        case D3DBufferUsage::STATIC:
+            return VertexStorageType::STATIC;
+        default:
+            UNREACHABLE();
+            return VertexStorageType::UNKNOWN;
+    }
+}
+
+VertexDataManager::CurrentValueState::CurrentValueState(BufferFactoryD3D *factory)
+    : buffer(new StreamingVertexBufferInterface(factory)), offset(0)
+{
+    data.Values.FloatValues[0] = std::numeric_limits<float>::quiet_NaN();
+    data.Values.FloatValues[1] = std::numeric_limits<float>::quiet_NaN();
+    data.Values.FloatValues[2] = std::numeric_limits<float>::quiet_NaN();
+    data.Values.FloatValues[3] = std::numeric_limits<float>::quiet_NaN();
+    data.Type                  = gl::VertexAttribType::Float;
+}
+
+VertexDataManager::CurrentValueState::CurrentValueState(CurrentValueState &&other)
+{
+    std::swap(buffer, other.buffer);
+    std::swap(data, other.data);
+    std::swap(offset, other.offset);
+}
+
+VertexDataManager::CurrentValueState::~CurrentValueState() {}
+
+VertexDataManager::VertexDataManager(BufferFactoryD3D *factory)
+    : mFactory(factory), mStreamingBuffer(factory)
+{
+    for (int currentValueIndex = 0; currentValueIndex < gl::MAX_VERTEX_ATTRIBS; ++currentValueIndex)
+    {
+        mCurrentValueCache.emplace_back(factory);
+    }
+}
+
+VertexDataManager::~VertexDataManager() {}
+
+angle::Result VertexDataManager::initialize(const gl::Context *context)
+{
+    return mStreamingBuffer.initialize(context, INITIAL_STREAM_BUFFER_SIZE);
+}
+
+void VertexDataManager::deinitialize()
+{
+    mStreamingBuffer.reset();
+    mCurrentValueCache.clear();
+}
+
+angle::Result VertexDataManager::prepareVertexData(
+    const gl::Context *context,
+    GLint start,
+    GLsizei count,
+    std::vector<TranslatedAttribute> *translatedAttribs,
+    GLsizei instances)
+{
+    const gl::State &state                  = context->getState();
+    const gl::ProgramExecutable *executable = state.getProgramExecutable();
+    const gl::VertexArray *vertexArray      = state.getVertexArray();
+    const auto &vertexAttributes            = vertexArray->getVertexAttributes();
+    const auto &vertexBindings              = vertexArray->getVertexBindings();
+
+    mDynamicAttribsMaskCache.reset();
+
+    translatedAttribs->clear();
+
+    for (size_t attribIndex = 0; attribIndex < vertexAttributes.size(); ++attribIndex)
+    {
+        // Skip attrib locations the program doesn't use.
+        if (!executable->isAttribLocationActive(attribIndex))
+            continue;
+
+        const auto &attrib  = vertexAttributes[attribIndex];
+        const auto &binding = vertexBindings[attrib.bindingIndex];
+
+        // Resize automatically puts in empty attribs
+        translatedAttribs->resize(attribIndex + 1);
+
+        TranslatedAttribute *translated = &(*translatedAttribs)[attribIndex];
+        auto currentValueData           = state.getVertexAttribCurrentValue(attribIndex);
+
+        // Record the attribute now
+        translated->active           = true;
+        translated->attribute        = &attrib;
+        translated->binding          = &binding;
+        translated->currentValueType = currentValueData.Type;
+        translated->divisor          = binding.getDivisor();
+
+        switch (ClassifyAttributeStorage(context, attrib, binding))
+        {
+            case VertexStorageType::STATIC:
+            {
+                // Store static attribute.
+                ANGLE_TRY(StoreStaticAttrib(context, translated));
+                break;
+            }
+            case VertexStorageType::DYNAMIC:
+                // Dynamic attributes must be handled together.
+                mDynamicAttribsMaskCache.set(attribIndex);
+                break;
+            case VertexStorageType::DIRECT:
+                // Update translated data for direct attributes.
+                StoreDirectAttrib(context, translated);
+                break;
+            case VertexStorageType::CURRENT_VALUE:
+            {
+                ANGLE_TRY(storeCurrentValue(context, currentValueData, translated, attribIndex));
+                break;
+            }
+            default:
+                UNREACHABLE();
+                break;
+        }
+    }
+
+    if (mDynamicAttribsMaskCache.none())
+    {
+        return angle::Result::Continue;
+    }
+
+    // prepareVertexData is only called by Renderer9 which don't support baseInstance
+    ANGLE_TRY(storeDynamicAttribs(context, translatedAttribs, mDynamicAttribsMaskCache, start,
+                                  count, instances, 0u));
+
+    PromoteDynamicAttribs(context, *translatedAttribs, mDynamicAttribsMaskCache, count);
+
+    return angle::Result::Continue;
+}
+
+// static
+void VertexDataManager::StoreDirectAttrib(const gl::Context *context,
+                                          TranslatedAttribute *directAttrib)
+{
+    ASSERT(directAttrib->attribute && directAttrib->binding);
+    const auto &attrib  = *directAttrib->attribute;
+    const auto &binding = *directAttrib->binding;
+
+    gl::Buffer *buffer = binding.getBuffer().get();
+    ASSERT(buffer);
+    BufferD3D *bufferD3D = GetImplAs<BufferD3D>(buffer);
+
+    ASSERT(DirectStoragePossible(context, attrib, binding));
+    directAttrib->vertexBuffer.set(nullptr);
+    directAttrib->storage = bufferD3D;
+    directAttrib->serial  = bufferD3D->getSerial();
+    directAttrib->stride = static_cast<unsigned int>(ComputeVertexAttributeStride(attrib, binding));
+    directAttrib->baseOffset =
+        static_cast<unsigned int>(ComputeVertexAttributeOffset(attrib, binding));
+
+    // Instanced vertices do not apply the 'start' offset
+    directAttrib->usesFirstVertexOffset = (binding.getDivisor() == 0);
+}
+
+// static
+angle::Result VertexDataManager::StoreStaticAttrib(const gl::Context *context,
+                                                   TranslatedAttribute *translated)
+{
+    ASSERT(translated->attribute && translated->binding);
+    const auto &attrib  = *translated->attribute;
+    const auto &binding = *translated->binding;
+
+    gl::Buffer *buffer = binding.getBuffer().get();
+    ASSERT(buffer && attrib.enabled && !DirectStoragePossible(context, attrib, binding));
+    BufferD3D *bufferD3D = GetImplAs<BufferD3D>(buffer);
+
+    // Compute source data pointer
+    const uint8_t *sourceData = nullptr;
+    const int offset          = static_cast<int>(ComputeVertexAttributeOffset(attrib, binding));
+
+    ANGLE_TRY(bufferD3D->getData(context, &sourceData));
+
+    if (sourceData)
+    {
+        sourceData += offset;
+    }
+
+    unsigned int streamOffset = 0;
+
+    translated->storage = nullptr;
+    ANGLE_TRY(bufferD3D->getFactory()->getVertexSpaceRequired(context, attrib, binding, 1, 0, 0,
+                                                              &translated->stride));
+
+    auto *staticBuffer = bufferD3D->getStaticVertexBuffer(attrib, binding);
+    ASSERT(staticBuffer);
+
+    if (staticBuffer->empty())
+    {
+        // Convert the entire buffer
+        int totalCount =
+            ElementsInBuffer(attrib, binding, static_cast<unsigned int>(bufferD3D->getSize()));
+        int startIndex = offset / static_cast<int>(ComputeVertexAttributeStride(attrib, binding));
+
+        if (totalCount > 0)
+        {
+            ANGLE_TRY(staticBuffer->storeStaticAttribute(context, attrib, binding, -startIndex,
+                                                         totalCount, 0, sourceData));
+        }
+    }
+
+    unsigned int firstElementOffset =
+        (static_cast<unsigned int>(offset) /
+         static_cast<unsigned int>(ComputeVertexAttributeStride(attrib, binding))) *
+        translated->stride;
+
+    VertexBuffer *vertexBuffer = staticBuffer->getVertexBuffer();
+
+    CheckedNumeric<unsigned int> checkedOffset(streamOffset);
+    checkedOffset += firstElementOffset;
+
+    ANGLE_CHECK_GL_MATH(GetImplAs<ContextD3D>(context), checkedOffset.IsValid());
+
+    translated->vertexBuffer.set(vertexBuffer);
+    translated->serial     = vertexBuffer->getSerial();
+    translated->baseOffset = streamOffset + firstElementOffset;
+
+    // Instanced vertices do not apply the 'start' offset
+    translated->usesFirstVertexOffset = (binding.getDivisor() == 0);
+
+    return angle::Result::Continue;
+}
+
+angle::Result VertexDataManager::storeDynamicAttribs(
+    const gl::Context *context,
+    std::vector<TranslatedAttribute> *translatedAttribs,
+    const gl::AttributesMask &dynamicAttribsMask,
+    GLint start,
+    size_t count,
+    GLsizei instances,
+    GLuint baseInstance)
+{
+    // Instantiating this class will ensure the streaming buffer is never left mapped.
+    class StreamingBufferUnmapper final : NonCopyable
+    {
+      public:
+        StreamingBufferUnmapper(StreamingVertexBufferInterface *streamingBuffer)
+            : mStreamingBuffer(streamingBuffer)
+        {
+            ASSERT(mStreamingBuffer);
+        }
+        ~StreamingBufferUnmapper() { mStreamingBuffer->getVertexBuffer()->hintUnmapResource(); }
+
+      private:
+        StreamingVertexBufferInterface *mStreamingBuffer;
+    };
+
+    // Will trigger unmapping on return.
+    StreamingBufferUnmapper localUnmapper(&mStreamingBuffer);
+
+    // Reserve the required space for the dynamic buffers.
+    for (auto attribIndex : dynamicAttribsMask)
+    {
+        const auto &dynamicAttrib = (*translatedAttribs)[attribIndex];
+        ANGLE_TRY(
+            reserveSpaceForAttrib(context, dynamicAttrib, start, count, instances, baseInstance));
+    }
+
+    // Store dynamic attributes
+    for (auto attribIndex : dynamicAttribsMask)
+    {
+        auto *dynamicAttrib = &(*translatedAttribs)[attribIndex];
+        ANGLE_TRY(
+            storeDynamicAttrib(context, dynamicAttrib, start, count, instances, baseInstance));
+    }
+
+    return angle::Result::Continue;
+}
+
+void VertexDataManager::PromoteDynamicAttribs(
+    const gl::Context *context,
+    const std::vector<TranslatedAttribute> &translatedAttribs,
+    const gl::AttributesMask &dynamicAttribsMask,
+    size_t count)
+{
+    for (auto attribIndex : dynamicAttribsMask)
+    {
+        const auto &dynamicAttrib = translatedAttribs[attribIndex];
+        ASSERT(dynamicAttrib.attribute && dynamicAttrib.binding);
+        const auto &binding = *dynamicAttrib.binding;
+
+        gl::Buffer *buffer = binding.getBuffer().get();
+        if (buffer)
+        {
+            // Note: this multiplication can overflow. It should not be a security problem.
+            BufferD3D *bufferD3D = GetImplAs<BufferD3D>(buffer);
+            size_t typeSize      = ComputeVertexAttributeTypeSize(*dynamicAttrib.attribute);
+            bufferD3D->promoteStaticUsage(context, count * typeSize);
+        }
+    }
+}
+
+angle::Result VertexDataManager::reserveSpaceForAttrib(const gl::Context *context,
+                                                       const TranslatedAttribute &translatedAttrib,
+                                                       GLint start,
+                                                       size_t count,
+                                                       GLsizei instances,
+                                                       GLuint baseInstance)
+{
+    ASSERT(translatedAttrib.attribute && translatedAttrib.binding);
+    const auto &attrib  = *translatedAttrib.attribute;
+    const auto &binding = *translatedAttrib.binding;
+
+    ASSERT(!DirectStoragePossible(context, attrib, binding));
+
+    gl::Buffer *buffer   = binding.getBuffer().get();
+    BufferD3D *bufferD3D = buffer ? GetImplAs<BufferD3D>(buffer) : nullptr;
+    ASSERT(!bufferD3D || bufferD3D->getStaticVertexBuffer(attrib, binding) == nullptr);
+
+    size_t totalCount = gl::ComputeVertexBindingElementCount(binding.getDivisor(), count,
+                                                             static_cast<size_t>(instances));
+    // TODO(jiajia.qin@intel.com): force the index buffer to clamp any out of range indices instead
+    // of invalid operation here.
+    if (bufferD3D)
+    {
+        // Vertices do not apply the 'start' offset when the divisor is non-zero even when doing
+        // a non-instanced draw call
+        GLint firstVertexIndex = binding.getDivisor() > 0
+                                     ? UnsignedCeilDivide(baseInstance, binding.getDivisor())
+                                     : start;
+        int64_t maxVertexCount =
+            static_cast<int64_t>(firstVertexIndex) + static_cast<int64_t>(totalCount);
+
+        int64_t maxByte = GetMaxAttributeByteOffsetForDraw(attrib, binding, maxVertexCount);
+
+        ASSERT(bufferD3D->getSize() <= static_cast<size_t>(std::numeric_limits<int64_t>::max()));
+        ANGLE_CHECK(GetImplAs<ContextD3D>(context),
+                    maxByte <= static_cast<int64_t>(bufferD3D->getSize()),
+                    "Vertex buffer is not big enough for the draw call.", GL_INVALID_OPERATION);
+    }
+    return mStreamingBuffer.reserveVertexSpace(context, attrib, binding, totalCount, instances,
+                                               baseInstance);
+}
+
+angle::Result VertexDataManager::storeDynamicAttrib(const gl::Context *context,
+                                                    TranslatedAttribute *translated,
+                                                    GLint start,
+                                                    size_t count,
+                                                    GLsizei instances,
+                                                    GLuint baseInstance)
+{
+    ASSERT(translated->attribute && translated->binding);
+    const auto &attrib  = *translated->attribute;
+    const auto &binding = *translated->binding;
+
+    gl::Buffer *buffer = binding.getBuffer().get();
+    ASSERT(buffer || attrib.pointer);
+    ASSERT(attrib.enabled);
+
+    BufferD3D *storage = buffer ? GetImplAs<BufferD3D>(buffer) : nullptr;
+
+    // Instanced vertices do not apply the 'start' offset
+    GLint firstVertexIndex =
+        (binding.getDivisor() > 0 ? UnsignedCeilDivide(baseInstance, binding.getDivisor()) : start);
+
+    // Compute source data pointer
+    const uint8_t *sourceData = nullptr;
+
+    if (buffer)
+    {
+        ANGLE_TRY(storage->getData(context, &sourceData));
+        sourceData += static_cast<int>(ComputeVertexAttributeOffset(attrib, binding));
+    }
+    else
+    {
+        // Attributes using client memory ignore the VERTEX_ATTRIB_BINDING state.
+        // https://www.opengl.org/registry/specs/ARB/vertex_attrib_binding.txt
+        sourceData = static_cast<const uint8_t *>(attrib.pointer);
+    }
+
+    unsigned int streamOffset = 0;
+
+    translated->storage = nullptr;
+    ANGLE_TRY(
+        mFactory->getVertexSpaceRequired(context, attrib, binding, 1, 0, 0, &translated->stride));
+
+    size_t totalCount = gl::ComputeVertexBindingElementCount(binding.getDivisor(), count,
+                                                             static_cast<size_t>(instances));
+
+    ANGLE_TRY(mStreamingBuffer.storeDynamicAttribute(
+        context, attrib, binding, translated->currentValueType, firstVertexIndex,
+        static_cast<GLsizei>(totalCount), instances, baseInstance, &streamOffset, sourceData));
+
+    VertexBuffer *vertexBuffer = mStreamingBuffer.getVertexBuffer();
+
+    translated->vertexBuffer.set(vertexBuffer);
+    translated->serial                = vertexBuffer->getSerial();
+    translated->baseOffset            = streamOffset;
+    translated->usesFirstVertexOffset = false;
+
+    return angle::Result::Continue;
+}
+
+angle::Result VertexDataManager::storeCurrentValue(
+    const gl::Context *context,
+    const gl::VertexAttribCurrentValueData &currentValue,
+    TranslatedAttribute *translated,
+    size_t attribIndex)
+{
+    CurrentValueState *cachedState         = &mCurrentValueCache[attribIndex];
+    StreamingVertexBufferInterface &buffer = *cachedState->buffer;
+
+    if (buffer.getBufferSize() == 0)
+    {
+        ANGLE_TRY(buffer.initialize(context, CONSTANT_VERTEX_BUFFER_SIZE));
+    }
+
+    if (cachedState->data != currentValue)
+    {
+        ASSERT(translated->attribute && translated->binding);
+        const auto &attrib  = *translated->attribute;
+        const auto &binding = *translated->binding;
+
+        ANGLE_TRY(buffer.reserveVertexSpace(context, attrib, binding, 1, 0, 0));
+
+        const uint8_t *sourceData =
+            reinterpret_cast<const uint8_t *>(currentValue.Values.FloatValues);
+        unsigned int streamOffset;
+        ANGLE_TRY(buffer.storeDynamicAttribute(context, attrib, binding, currentValue.Type, 0, 1, 0,
+                                               0, &streamOffset, sourceData));
+
+        buffer.getVertexBuffer()->hintUnmapResource();
+
+        cachedState->data   = currentValue;
+        cachedState->offset = streamOffset;
+    }
+
+    translated->vertexBuffer.set(buffer.getVertexBuffer());
+
+    translated->storage               = nullptr;
+    translated->serial                = buffer.getSerial();
+    translated->divisor               = 0;
+    translated->stride                = 0;
+    translated->baseOffset            = static_cast<unsigned int>(cachedState->offset);
+    translated->usesFirstVertexOffset = false;
+
+    return angle::Result::Continue;
+}
+
+// VertexBufferBinding implementation
+VertexBufferBinding::VertexBufferBinding() : mBoundVertexBuffer(nullptr) {}
+
+VertexBufferBinding::VertexBufferBinding(const VertexBufferBinding &other)
+    : mBoundVertexBuffer(other.mBoundVertexBuffer)
+{
+    if (mBoundVertexBuffer)
+    {
+        mBoundVertexBuffer->addRef();
+    }
+}
+
+VertexBufferBinding::~VertexBufferBinding()
+{
+    if (mBoundVertexBuffer)
+    {
+        mBoundVertexBuffer->release();
+    }
+}
+
+VertexBufferBinding &VertexBufferBinding::operator=(const VertexBufferBinding &other)
+{
+    mBoundVertexBuffer = other.mBoundVertexBuffer;
+    if (mBoundVertexBuffer)
+    {
+        mBoundVertexBuffer->addRef();
+    }
+    return *this;
+}
+
+void VertexBufferBinding::set(VertexBuffer *vertexBuffer)
+{
+    if (mBoundVertexBuffer == vertexBuffer)
+        return;
+
+    if (mBoundVertexBuffer)
+    {
+        mBoundVertexBuffer->release();
+    }
+    if (vertexBuffer)
+    {
+        vertexBuffer->addRef();
+    }
+
+    mBoundVertexBuffer = vertexBuffer;
+}
+
+VertexBuffer *VertexBufferBinding::get() const
+{
+    return mBoundVertexBuffer;
+}
+
+}  // namespace rx