Method initWithVertex

tests/cpp-tests/Source/ShaderTest/ShaderTest.cpp:89–128

}

bool ShaderNode::initWithVertex(std::string_view vert, std::string_view frag)
{
    if (vert.empty())
        vert = position_vert;
    _vertFileName = vert;
    _fragFileName = frag;

    loadShaderVertex(vert, frag);

    _time       = 0;
    _resolution = Vec2(SIZE_X, SIZE_Y);

    scheduleUpdate();

    setContentSize(Size(SIZE_X, SIZE_Y));
    setAnchorPoint(Vec2(0.5f, 0.5f));

    // init custom command
    auto attrPosLoc = _programState->getAttributeLocation("a_position");

    auto vertexLayout = _programState->getMutableVertexLayout();
    vertexLayout->setAttrib("a_position", attrPosLoc, backend::VertexFormat::FLOAT2, 0, false);

    float w = SIZE_X, h = SIZE_Y;
    Vec2 vertices[6] = {Vec2(0.0f, 0.0f), Vec2(w, 0.0f), Vec2(w, h), Vec2(0.0f, 0.0f), Vec2(0.0f, h), Vec2(w, h)};
    vertexLayout->setStride(sizeof(Vec2));

    /*
     * TODO: the Y-coordinate of subclasses are flipped in metal
     *
     * keywords: AX_USE_METAL , AX_USE_GL
     */

    _customCommand.createVertexBuffer(sizeof(Vec2), 6, CustomCommand::BufferUsage::STATIC);
    _customCommand.updateVertexBuffer(vertices, sizeof(vertices));

    _customCommand.setDrawType(CustomCommand::DrawType::ARRAY);

    return true;
}

void ShaderNode::loadShaderVertex(std::string_view vert, std::string_view frag)
{