Method drawBatchedTriangles

core/renderer/Renderer.cpp:608–715

}

void Renderer::drawBatchedTriangles()
{
    if (_queuedTriangleCommands.empty())
        return;

        /************** 1: Setup up vertices/indices *************/
#ifdef AX_USE_METAL
    unsigned int vertexBufferFillOffset = _queuedTotalVertexCount - _queuedVertexCount;
    unsigned int indexBufferFillOffset  = _queuedTotalIndexCount - _queuedIndexCount;
#else
    unsigned int vertexBufferFillOffset = 0;
    unsigned int indexBufferFillOffset  = 0;
#endif

    _triBatchesToDraw[0].offset        = indexBufferFillOffset;
    _triBatchesToDraw[0].indicesToDraw = 0;
    _triBatchesToDraw[0].cmd           = nullptr;

    int batchesTotal        = 0;
    uint32_t prevMaterialID = 0;
    bool firstCommand       = true;

    _filledVertex = 0;
    _filledIndex  = 0;

    for (const auto& cmd : _queuedTriangleCommands)
    {
        auto currentMaterialID = cmd->getMaterialID();
        const bool batchable   = !cmd->isSkipBatching();

        fillVerticesAndIndices(cmd, vertexBufferFillOffset);

        // in the same batch ?
        if (batchable && (prevMaterialID == currentMaterialID || firstCommand))
        {
            AX_ASSERT((firstCommand || _triBatchesToDraw[batchesTotal].cmd->getMaterialID() == cmd->getMaterialID()) &&
                      "argh... error in logic");
            _triBatchesToDraw[batchesTotal].indicesToDraw += cmd->getIndexCount();
            _triBatchesToDraw[batchesTotal].cmd = cmd;
        }
        else
        {
            // is this the first one?
            if (!firstCommand)
            {
                batchesTotal++;
                _triBatchesToDraw[batchesTotal].offset =
                    _triBatchesToDraw[batchesTotal - 1].offset + _triBatchesToDraw[batchesTotal - 1].indicesToDraw;
            }

            _triBatchesToDraw[batchesTotal].cmd           = cmd;
            _triBatchesToDraw[batchesTotal].indicesToDraw = (int)cmd->getIndexCount();

            // is this a single batch ? Prevent creating a batch group then
            if (!batchable)
                currentMaterialID = 0;
        }