VertexArray.cpp

Branch :
Show log
Commit
Author : Shao
Date : 2017-05-22 14:13:27
Hash : dde78e8c
Message : ES31: Implement Vertex Attrib Binding on OpenGL This patch intends to implement Vertex Attrib Binding on OpenGL back-ends: 1. Add supports for updating vertex attributes by Vertex Attrib Binding APIs. 2. Refactor the process of updating vertex attribtues in class VertexArray to make it easier to implement this feature. BUG=angleproject:1593 TEST=dEQP-GLES31.functional.vertex_attribute_binding.* Change-Id: I800e61518c552b94b84c415895ad31668b0a84b2 Reviewed-on: https://chromium-review.googlesource.com/510251 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>
src/libANGLE/VertexArray.cpp
//
// Copyright (c) 2013 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.
//
// Implementation of the state class for mananging GLES 3 Vertex Array Objects.
//

#include "libANGLE/VertexArray.h"
#include "libANGLE/Buffer.h"
#include "libANGLE/Context.h"
#include "libANGLE/renderer/GLImplFactory.h"
#include "libANGLE/renderer/VertexArrayImpl.h"

namespace gl
{

VertexArrayState::VertexArrayState(size_t maxAttribs, size_t maxAttribBindings)
    : mLabel(), mVertexBindings(maxAttribBindings), mMaxEnabledAttribute(0)
{
    ASSERT(maxAttribs <= maxAttribBindings);

    for (size_t i = 0; i < maxAttribs; i++)
    {
        mVertexAttributes.emplace_back(static_cast<GLuint>(i));
    }
}

VertexArrayState::~VertexArrayState()
{
}

VertexArray::VertexArray(rx::GLImplFactory *factory,
                         GLuint id,
                         size_t maxAttribs,
                         size_t maxAttribBindings)
    : mId(id),
      mState(maxAttribs, maxAttribBindings),
      mVertexArray(factory->createVertexArray(mState))
{
}

void VertexArray::onDestroy(const Context *context)
{
    for (auto &binding : mState.mVertexBindings)
    {
        binding.setBuffer(context, nullptr);
    }
    mState.mElementArrayBuffer.set(context, nullptr);
    mVertexArray->destroy(context);
    SafeDelete(mVertexArray);
    delete this;
}

VertexArray::~VertexArray()
{
    ASSERT(!mVertexArray);
}

GLuint VertexArray::id() const
{
    return mId;
}

void VertexArray::setLabel(const std::string &label)
{
    mState.mLabel = label;
}

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

void VertexArray::detachBuffer(const Context *context, GLuint bufferName)
{
    for (auto &binding : mState.mVertexBindings)
    {
        if (binding.getBuffer().id() == bufferName)
        {
            binding.setBuffer(context, nullptr);
        }
    }

    if (mState.mElementArrayBuffer.id() == bufferName)
    {
        mState.mElementArrayBuffer.set(context, nullptr);
    }
}

const VertexAttribute &VertexArray::getVertexAttribute(size_t attribIndex) const
{
    ASSERT(attribIndex < getMaxAttribs());
    return mState.mVertexAttributes[attribIndex];
}

const VertexBinding &VertexArray::getVertexBinding(size_t bindingIndex) const
{
    ASSERT(bindingIndex < getMaxBindings());
    return mState.mVertexBindings[bindingIndex];
}

size_t VertexArray::GetVertexIndexFromDirtyBit(size_t dirtyBit)
{
    static_assert(gl::MAX_VERTEX_ATTRIBS == gl::MAX_VERTEX_ATTRIB_BINDINGS,
                  "The stride of vertex attributes should equal to that of vertex bindings.");
    ASSERT(dirtyBit > DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
    return (dirtyBit - DIRTY_BIT_ATTRIB_0_ENABLED) % gl::MAX_VERTEX_ATTRIBS;
}

void VertexArray::bindVertexBufferImpl(const Context *context,
                                       size_t bindingIndex,
                                       Buffer *boundBuffer,
                                       GLintptr offset,
                                       GLsizei stride)
{
    ASSERT(bindingIndex < getMaxBindings());

    VertexBinding *binding = &mState.mVertexBindings[bindingIndex];

    binding->setBuffer(context, boundBuffer);
    binding->setOffset(offset);
    binding->setStride(stride);
}

void VertexArray::bindVertexBuffer(const Context *context,
                                   size_t bindingIndex,
                                   Buffer *boundBuffer,
                                   GLintptr offset,
                                   GLsizei stride)
{
    bindVertexBufferImpl(context, bindingIndex, boundBuffer, offset, stride);

    mDirtyBits.set(DIRTY_BIT_BINDING_0_BUFFER + bindingIndex);
}

void VertexArray::setVertexAttribBinding(const Context *context,
                                         size_t attribIndex,
                                         GLuint bindingIndex)
{
    ASSERT(attribIndex < getMaxAttribs() && bindingIndex < getMaxBindings());

    if (mState.mVertexAttributes[attribIndex].bindingIndex != bindingIndex)
    {
        // In ES 3.0 contexts, the binding cannot change, hence the code below is unreachable.
        ASSERT(context->getClientVersion() >= ES_3_1);
        mState.mVertexAttributes[attribIndex].bindingIndex = bindingIndex;

        mDirtyBits.set(DIRTY_BIT_ATTRIB_0_BINDING + attribIndex);
    }
}

void VertexArray::setVertexBindingDivisor(size_t bindingIndex, GLuint divisor)
{
    ASSERT(bindingIndex < getMaxBindings());

    mState.mVertexBindings[bindingIndex].setDivisor(divisor);

    mDirtyBits.set(DIRTY_BIT_BINDING_0_DIVISOR + bindingIndex);
}

void VertexArray::setVertexAttribFormatImpl(size_t attribIndex,
                                            GLint size,
                                            GLenum type,
                                            bool normalized,
                                            bool pureInteger,
                                            GLuint relativeOffset)
{
    ASSERT(attribIndex < getMaxAttribs());

    VertexAttribute *attrib = &mState.mVertexAttributes[attribIndex];

    attrib->size           = size;
    attrib->type           = type;
    attrib->normalized     = normalized;
    attrib->pureInteger    = pureInteger;
    attrib->relativeOffset = relativeOffset;
}

void VertexArray::setVertexAttribFormat(size_t attribIndex,
                                        GLint size,
                                        GLenum type,
                                        bool normalized,
                                        bool pureInteger,
                                        GLuint relativeOffset)
{
    setVertexAttribFormatImpl(attribIndex, size, type, normalized, pureInteger, relativeOffset);

    mDirtyBits.set(DIRTY_BIT_ATTRIB_0_FORMAT + attribIndex);
}

void VertexArray::setVertexAttribDivisor(const Context *context, size_t attribIndex, GLuint divisor)
{
    ASSERT(attribIndex < getMaxAttribs());

    setVertexAttribBinding(context, attribIndex, static_cast<GLuint>(attribIndex));
    setVertexBindingDivisor(attribIndex, divisor);
}

void VertexArray::enableAttribute(size_t attribIndex, bool enabledState)
{
    ASSERT(attribIndex < getMaxAttribs());

    mState.mVertexAttributes[attribIndex].enabled = enabledState;

    mDirtyBits.set(DIRTY_BIT_ATTRIB_0_ENABLED + attribIndex);

    // Update state cache
    if (enabledState)
    {
        mState.mMaxEnabledAttribute = std::max(attribIndex + 1, mState.mMaxEnabledAttribute);
    }
    else if (mState.mMaxEnabledAttribute == attribIndex + 1)
    {
        while (mState.mMaxEnabledAttribute > 0 &&
               !mState.mVertexAttributes[mState.mMaxEnabledAttribute - 1].enabled)
        {
            --mState.mMaxEnabledAttribute;
        }
    }
}

void VertexArray::setVertexAttribPointer(const Context *context,
                                         size_t attribIndex,
                                         gl::Buffer *boundBuffer,
                                         GLint size,
                                         GLenum type,
                                         bool normalized,
                                         bool pureInteger,
                                         GLsizei stride,
                                         const void *pointer)
{
    ASSERT(attribIndex < getMaxAttribs());

    GLintptr offset = boundBuffer ? reinterpret_cast<GLintptr>(pointer) : 0;

    setVertexAttribFormatImpl(attribIndex, size, type, normalized, pureInteger, 0);
    setVertexAttribBinding(context, attribIndex, static_cast<GLuint>(attribIndex));

    VertexAttribute &attrib = mState.mVertexAttributes[attribIndex];

    GLsizei effectiveStride =
        stride != 0 ? stride : static_cast<GLsizei>(ComputeVertexAttributeTypeSize(attrib));
    attrib.pointer                 = pointer;
    attrib.vertexAttribArrayStride = stride;

    bindVertexBufferImpl(context, attribIndex, boundBuffer, offset, effectiveStride);

    mDirtyBits.set(DIRTY_BIT_ATTRIB_0_POINTER + attribIndex);
}

void VertexArray::setElementArrayBuffer(const Context *context, Buffer *buffer)
{
    mState.mElementArrayBuffer.set(context, buffer);
    mDirtyBits.set(DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
}

void VertexArray::syncImplState(const Context *context)
{
    if (mDirtyBits.any())
    {
        mVertexArray->syncState(context, mDirtyBits);
        mDirtyBits.reset();
    }
}

}  // namespace gl
kc3-lang/angle/src/libANGLE/VertexArray.cpp

Commit

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