cocos-enhance-kit/cocos2d-x/cocos/renderer/scene/assembler/Particle3DAssembler.cpp

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

http://www.cocos2d-x.org

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#include "Particle3DAssembler.hpp"
#include "../NodeProxy.hpp"

RENDERER_BEGIN

Particle3DAssembler::Particle3DAssembler()
{
    
}

Particle3DAssembler::~Particle3DAssembler()
{
    CC_SAFE_RELEASE(_trailVfmt);
}

void Particle3DAssembler::setTrailVertexFormat(VertexFormat *vfmt)
{
    if (_trailVfmt == vfmt) return;
    CC_SAFE_RETAIN(vfmt);
    CC_SAFE_RELEASE(_trailVfmt);
    _trailVfmt = vfmt;
    if (_trailVfmt)
    {
        _trailVertexBytes = _trailVfmt->getBytes();
        const VertexFormat::Element* vfPos = _vfmt->getElement(ATTRIB_NAME_POSITION_HASH);
        _trailPosOffset = vfPos->offset / 4;
    }
}

void Particle3DAssembler::fillBuffer(NodeProxy *node, MeshBuffer *buffer, const IARenderData& ia, RenderData* data)
{
    CCASSERT(data->getVBytes() % _bytesPerVertex == 0, "Assembler::fillBuffers vertices data doesn't follow vertex format");
    uint32_t vertexCount = ia.verticesCount >= 0 ? (uint32_t)ia.verticesCount : (uint32_t)data->getVBytes() / _bytesPerVertex;
    uint32_t indexCount = ia.indicesCount >= 0 ? (uint32_t)ia.indicesCount : (uint32_t)data->getIBytes() / sizeof(unsigned short);
    uint32_t vertexStart = (uint32_t)ia.verticesStart;
    
    // must retrieve offset before request
    auto& bufferOffset = buffer->request(vertexCount, indexCount);
    uint32_t vBufferOffset = bufferOffset.vByte / sizeof(float);
    uint32_t indexId = bufferOffset.index;
    uint32_t vertexId = bufferOffset.vertex;
    uint32_t vertexOffset = vertexId - vertexStart;

    float* worldVerts = buffer->vData + vBufferOffset;
    memcpy(worldVerts, data->getVertices() + vertexStart * _bytesPerVertex, vertexCount * _bytesPerVertex);
    
    // Copy index buffer with vertex offset
    uint16_t* indices = (uint16_t*)data->getIndices();
    uint16_t* dst = buffer->iData;
    for (auto i = 0, j = ia.indicesStart; i < indexCount; ++i, ++j)
    {
        dst[indexId++] = vertexOffset + indices[j];
    }
}

void Particle3DAssembler::fillTrailBuffer(NodeProxy *node, MeshBuffer *buffer, const IARenderData& ia, RenderData* data)
{
    CCASSERT(data->getVBytes() % _trailVertexBytes == 0, "Assembler::fillBuffers vertices data doesn't follow vertex format");
    uint32_t vertexCount = ia.verticesCount >= 0 ? (uint32_t)ia.verticesCount : (uint32_t)data->getVBytes() / _trailVertexBytes;
    uint32_t indexCount = ia.indicesCount >= 0 ? (uint32_t)ia.indicesCount : (uint32_t)data->getIBytes() / sizeof(unsigned short);
    uint32_t vertexStart = (uint32_t)ia.verticesStart;
    
    // must retrieve offset before request
    auto& bufferOffset = buffer->request(vertexCount, indexCount);
    uint32_t vBufferOffset = bufferOffset.vByte / sizeof(float);
    uint32_t indexId = bufferOffset.index;
    uint32_t vertexId = bufferOffset.vertex;
    uint32_t vertexOffset = vertexId - vertexStart;

    float* worldVerts = buffer->vData + vBufferOffset;
    memcpy(worldVerts, data->getVertices() + vertexStart * _trailVertexBytes, vertexCount * _trailVertexBytes);
    
    // Copy index buffer with vertex offset
    uint16_t* indices = (uint16_t*)data->getIndices();
    uint16_t* dst = buffer->iData;
    for (auto i = 0, j = ia.indicesStart; i < indexCount; ++i, ++j)
    {
        dst[indexId++] = vertexOffset + indices[j];
    }
}

void Particle3DAssembler::fillBuffers(NodeProxy *node, ModelBatcher *batcher, std::size_t index)
{
    VertexFormat* vfmt = index == 0 ? _vfmt : _trailVfmt;
    
    if (!_datas || !vfmt)
    {
        return;
    }
    
    MeshBuffer* buffer = batcher->getBuffer(vfmt);
    
    const IARenderData& ia = _iaDatas[index];
    std::size_t meshIndex = ia.meshIndex >= 0 ? ia.meshIndex : index;
    
    RenderData* data = _datas->getRenderData(meshIndex);
    if (!data)
    {
        return;
    }
    
    if (index != 0)
    {
        fillTrailBuffer(node, buffer, ia, data);
    }
    else
    {
        fillBuffer(node, buffer, ia, data);
    }
}

RENDERER_END