cocos_lib/cocos/editor-support/MeshBuffer.cpp

/****************************************************************************
 Copyright (c) 2020-2023 Xiamen Yaji Software Co., Ltd.

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 of this software and associated documentation files (the "Software"), to deal
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 THE SOFTWARE.
****************************************************************************/

#include "MeshBuffer.h"
#include "2d/renderer/UIMeshBuffer.h"

MIDDLEWARE_BEGIN

static const ccstd::vector<gfx::Attribute> ATTRIBUTES_V3F_T2F_C4B{
    gfx::Attribute{gfx::ATTR_NAME_POSITION, gfx::Format::RGB32F},
    gfx::Attribute{gfx::ATTR_NAME_TEX_COORD, gfx::Format::RG32F},
    gfx::Attribute{gfx::ATTR_NAME_COLOR, gfx::Format::RGBA8, true},
};

static const ccstd::vector<gfx::Attribute> ATTRIBUTES_V3F_T2F_C4B_C4B{
    gfx::Attribute{gfx::ATTR_NAME_POSITION, gfx::Format::RGB32F},
    gfx::Attribute{gfx::ATTR_NAME_TEX_COORD, gfx::Format::RG32F},
    gfx::Attribute{gfx::ATTR_NAME_COLOR, gfx::Format::RGBA8, true},
    gfx::Attribute{gfx::ATTR_NAME_COLOR2, gfx::Format::RGBA8, true},
};

MeshBuffer::MeshBuffer(int vertexFormat)
: MeshBuffer(vertexFormat, INIT_INDEX_BUFFER_SIZE, MAX_VERTEX_BUFFER_SIZE) {
}

MeshBuffer::MeshBuffer(int vertexFormat, size_t indexSize, size_t vertexSize)
: _vertexFormat(vertexFormat), _ib(indexSize), _vb(vertexSize * vertexFormat * sizeof(float)) {
    _vb.setMaxSize(MAX_VERTEX_BUFFER_SIZE * _vertexFormat * sizeof(float));
    _ib.setMaxSize(100 * INIT_INDEX_BUFFER_SIZE);
    _vb.setFullCallback([this] {
        uploadVB();
        uploadIB();
        _vb.reset();
        _ib.reset();
        next();
    });

    init();
}

MeshBuffer::~MeshBuffer() {
    clear();
}

void MeshBuffer::clear() {
    size_t num = _vbArr.size();
    for (size_t i = 0; i < num; i++) {
        delete _ibArr[i];
        delete _vbArr[i];
    }
    _ibArr.clear();
    _vbArr.clear();
    cleanUIMeshBuffer();
}

void MeshBuffer::init() {
    auto *rIB = new IOTypedArray(se::Object::TypedArrayType::UINT16, _ib.getCapacity());
    _ibArr.push_back(rIB);

    auto *rVB = new IOTypedArray(se::Object::TypedArrayType::FLOAT32, _vb.getCapacity());
    _vbArr.push_back(rVB);
    cleanUIMeshBuffer();
    addUIMeshBuffer();
}

void MeshBuffer::uploadVB() {
    auto length = _vb.length();
    if (length == 0) return;

    auto *rVB = _vbArr[_bufferPos];
    rVB->reset();
    rVB->writeBytes(reinterpret_cast<const char *>(_vb.getBuffer()), _vb.length());
    auto *uiMeshBuffer = _uiMeshBufferArr[_bufferPos];
    uiMeshBuffer->setVData(reinterpret_cast<float *>(rVB->getBuffer()));
    uiMeshBuffer->setByteOffset(static_cast<uint32_t>(_vb.length()));
}

void MeshBuffer::uploadIB() {
    auto length = _ib.length();
    if (length == 0) return;

    auto *rIB = _ibArr[_bufferPos];
    rIB->reset();
    if (rIB->getCapacity() < length) {
        rIB->resize(length, false);
    }
    rIB->writeBytes(reinterpret_cast<const char *>(_ib.getBuffer()), _ib.length());
    auto *uiMeshBuffer = _uiMeshBufferArr[_bufferPos];
    uiMeshBuffer->setIData(reinterpret_cast<uint16_t *>(rIB->getBuffer()));
}

void MeshBuffer::next() {
    _bufferPos++;
    if (_ibArr.size() <= _bufferPos) {
        auto *rIB = new IOTypedArray(se::Object::TypedArrayType::UINT16, _ib.getCapacity());
        _ibArr.push_back(rIB);
    }

    if (_vbArr.size() <= _bufferPos) {
        auto *rVB = new IOTypedArray(se::Object::TypedArrayType::FLOAT32, _vb.getCapacity());
        _vbArr.push_back(rVB);
    }

    if (_uiMeshBufferArr.size() <= _bufferPos) {
        addUIMeshBuffer();
    }
}

void MeshBuffer::reset() {
    _bufferPos = 0;
    _vb.reset();
    _ib.reset();
}

void MeshBuffer::addUIMeshBuffer() {
    UIMeshBuffer *uiMeshBuffer = new UIMeshBuffer();
    ccstd::vector<gfx::Attribute> attrs;
    if (_vertexFormat == VF_XYZUVC) {
        attrs = ATTRIBUTES_V3F_T2F_C4B;
    } else {
        attrs = ATTRIBUTES_V3F_T2F_C4B_C4B;
    }
    uiMeshBuffer->initialize(std::move(attrs), true);
    _uiMeshBufferArr.push_back(uiMeshBuffer);
}

void MeshBuffer::cleanUIMeshBuffer() {
    for (auto *buf : _uiMeshBufferArr) {
        delete buf;
    }
    _uiMeshBufferArr.clear();
}

cc::UIMeshBuffer *MeshBuffer::getUIMeshBuffer() const {
    return _uiMeshBufferArr[_bufferPos];
}

const ccstd::vector<cc::UIMeshBuffer *> &MeshBuffer::uiMeshBuffers() const {
    return _uiMeshBufferArr;
}

MIDDLEWARE_END