cocos_lib/cocos/2d/renderer/UIMeshBuffer.cpp

/****************************************************************************
 Copyright (c) 2019-2023 Xiamen Yaji Software Co., Ltd.

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 of this software and associated documentation files (the "Software"), to deal
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#include "2d/renderer/UIMeshBuffer.h"
#include "renderer/gfx-base/GFXDevice.h"

namespace cc {

static uint32_t getAttributesStride(ccstd::vector<gfx::Attribute>& attrs) {
    uint32_t stride = 0;
    for (auto& attr : attrs) {
        const auto& info = gfx::GFX_FORMAT_INFOS[static_cast<uint32_t>(attr.format)];
        stride += info.size;
    }
    return stride;
}

UIMeshBuffer::~UIMeshBuffer() {
    destroy();
}

void UIMeshBuffer::setVData(float* vData) {
    _vData = vData;
}

void UIMeshBuffer::setIData(uint16_t* iData) {
    _iData = iData;
}

void UIMeshBuffer::initialize(ccstd::vector<gfx::Attribute>&& attrs, bool needCreateLayout) {
    _attributes = attrs;
    _vertexFormatBytes = getAttributesStride(attrs);
    if (needCreateLayout) {
        _meshBufferLayout = new MeshBufferLayout();
    }
    _needDeleteLayout = needCreateLayout;
}

void UIMeshBuffer::reset() {
    setIndexOffset(0);
    _dirty = false;
}

void UIMeshBuffer::resetIA() {
}

void UIMeshBuffer::destroy() {
    reset();
    _attributes.clear();
    _vb = nullptr;
    _ib = nullptr;
    if (_needDeleteVData) {
        delete _vData;
        delete _iData;
    }
    _vData = nullptr;
    _iData = nullptr;
    // Destroy InputAssemblers
    _ia = nullptr;
    if (_needDeleteLayout) {
        CC_SAFE_DELETE(_meshBufferLayout);
    }
}

void UIMeshBuffer::setDirty() {
    _dirty = true;
}

gfx::InputAssembler* UIMeshBuffer::requireFreeIA(gfx::Device* device) {
    return createNewIA(device);
}

void UIMeshBuffer::uploadBuffers() {
    uint32_t byteOffset = getByteOffset();
    bool dirty = getDirty();
    if (_meshBufferLayout == nullptr || byteOffset == 0 || !dirty || !_ia) {
        return;
    }

    uint32_t indexCount = getIndexOffset();
    uint32_t byteCount = getByteOffset();

    gfx::BufferList vBuffers = _ia->getVertexBuffers();
    if (!vBuffers.empty()) {
        gfx::Buffer* vBuffer = vBuffers[0];
        if (byteCount > vBuffer->getSize()) {
            vBuffer->resize(byteCount);
        }
        vBuffer->update(_vData);
    }
    gfx::Buffer* iBuffer = _ia->getIndexBuffer();
    if (indexCount * 2 > iBuffer->getSize()) {
        iBuffer->resize(indexCount * 2);
    }
    iBuffer->update(_iData);

    setDirty(false);
}

// use less
void UIMeshBuffer::recycleIA(gfx::InputAssembler* ia) {
}

gfx::InputAssembler* UIMeshBuffer::createNewIA(gfx::Device* device) {
    if (!_ia) {
        uint32_t vbStride = _vertexFormatBytes;
        uint32_t ibStride = sizeof(uint16_t);

        gfx::InputAssemblerInfo iaInfo = {};
        _vb = device->createBuffer({
            gfx::BufferUsageBit::VERTEX | gfx::BufferUsageBit::TRANSFER_DST,
            gfx::MemoryUsageBit::DEVICE | gfx::MemoryUsageBit::HOST,
            vbStride * 3,
            vbStride,
        });
        _ib = device->createBuffer({
            gfx::BufferUsageBit::INDEX | gfx::BufferUsageBit::TRANSFER_DST,
            gfx::MemoryUsageBit::DEVICE | gfx::MemoryUsageBit::HOST,
            ibStride * 3,
            ibStride,
        });

        iaInfo.attributes = _attributes;
        iaInfo.vertexBuffers.emplace_back(_vb);
        iaInfo.indexBuffer = _ib;
        _ia = device->createInputAssembler(iaInfo);
    }

    return _ia;
}

void UIMeshBuffer::syncSharedBufferToNative(uint32_t* buffer) {
    _sharedBuffer = buffer;
    parseLayout();
}

void UIMeshBuffer::parseLayout() {
    _meshBufferLayout = reinterpret_cast<MeshBufferLayout*>(_sharedBuffer);
}

void UIMeshBuffer::setByteOffset(uint32_t byteOffset) {
    _meshBufferLayout->byteOffset = byteOffset;
}

void UIMeshBuffer::setVertexOffset(uint32_t vertexOffset) {
    _meshBufferLayout->vertexOffset = vertexOffset;
}

void UIMeshBuffer::setIndexOffset(uint32_t indexOffset) {
    _meshBufferLayout->indexOffset = indexOffset;
}

void UIMeshBuffer::setDirty(bool dirty) const {
    _meshBufferLayout->dirtyMark = dirty ? 1 : 0;
}

} // namespace cc