axmol/tests/cpp-tests/Classes/MeshRendererTest/DrawNode3D.cpp

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 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#include "DrawNode3D.h"
#include "renderer/backend/Buffer.h"
NS_CC_BEGIN

DrawNode3D::DrawNode3D()
{
    _blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;
}

DrawNode3D::~DrawNode3D()
{
    CC_SAFE_RELEASE_NULL(_programStateLine);
    CC_SAFE_DELETE(_depthstencilDescriptor);
}

DrawNode3D* DrawNode3D::create()
{
    DrawNode3D* ret = new DrawNode3D();
    if (ret->init())
    {
        ret->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(ret);
    }

    return ret;
}

void DrawNode3D::ensureCapacity(int count)
{
    CCASSERT(count >= 0, "capacity must be >= 0");

    auto EXTENDED_SIZE = _bufferLines.size() + count;

    _bufferLines.reserve(EXTENDED_SIZE);

    if (!_customCommand.getVertexBuffer() ||
        _customCommand.getVertexBuffer()->getSize() < (EXTENDED_SIZE * sizeof(_bufferLines[0])))
    {
        _customCommand.createVertexBuffer(sizeof(V3F_C4B), EXTENDED_SIZE + (EXTENDED_SIZE >> 1),
                                          CustomCommand::BufferUsage::DYNAMIC);
    }
}

bool DrawNode3D::init()
{
    _blendFunc        = BlendFunc::ALPHA_PREMULTIPLIED;
    auto& pd          = _customCommand.getPipelineDescriptor();
    auto program      = backend::Program::getBuiltinProgram(backend::ProgramType::LINE_COLOR_3D);
    _programStateLine = new backend::ProgramState(program);
    pd.programState   = _programStateLine;

    _locMVPMatrix = _programStateLine->getUniformLocation("u_MVPMatrix");

    _customCommand.setBeforeCallback(CC_CALLBACK_0(DrawNode3D::onBeforeDraw, this));
    _customCommand.setAfterCallback(CC_CALLBACK_0(DrawNode3D::onAfterDraw, this));

    auto layout = _programStateLine->getVertexLayout();
#define INITIAL_VERTEX_BUFFER_LENGTH 512

    ensureCapacity(INITIAL_VERTEX_BUFFER_LENGTH);

    _customCommand.setDrawType(CustomCommand::DrawType::ARRAY);
    _customCommand.setPrimitiveType(CustomCommand::PrimitiveType::LINE);

    const auto& attributeInfo = _programStateLine->getProgram()->getActiveAttributes();
    auto iter                 = attributeInfo.find("a_position");
    if (iter != attributeInfo.end())
    {
        layout->setAttribute("a_position", iter->second.location, backend::VertexFormat::FLOAT3, 0, false);
    }
    iter = attributeInfo.find("a_color");
    if (iter != attributeInfo.end())
    {
        layout->setAttribute("a_color", iter->second.location, backend::VertexFormat::UBYTE4, sizeof(Vec3), true);
    }
    layout->setLayout(sizeof(V3F_C4B));

    _customCommand.createVertexBuffer(sizeof(V3F_C4B), INITIAL_VERTEX_BUFFER_LENGTH,
                                      CustomCommand::BufferUsage::DYNAMIC);
    _isDirty = true;

#if CC_ENABLE_CACHE_TEXTURE_DATA
    // Need to listen the event only when not use batchnode, because it will use VBO
    auto listener = EventListenerCustom::create(EVENT_COME_TO_FOREGROUND, [this](EventCustom* event) {
        /** listen the event that coming to foreground on Android */
        this->init();
    });

    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
#endif

    return true;
}

void DrawNode3D::draw(Renderer* renderer, const Mat4& transform, uint32_t flags)
{
    _customCommand.init(_globalZOrder, transform, flags);

    updateCommand(renderer, transform, flags);

    if (_isDirty && !_bufferLines.empty())
    {
        _customCommand.updateVertexBuffer(_bufferLines.data(),
                                          (unsigned int)(_bufferLines.size() * sizeof(_bufferLines[0])));
        _customCommand.setVertexDrawInfo(0, _bufferLines.size());
        _isDirty = false;
    }

    if (!_bufferLines.empty())
    {
        renderer->addCommand(&_customCommand);
    }
}

void DrawNode3D::updateCommand(cocos2d::Renderer* renderer, const Mat4& transform, uint32_t flags)
{
    auto& matrixP = Director::getInstance()->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);
    auto mvp      = matrixP * transform;

    _programStateLine->setUniform(_locMVPMatrix, mvp.m, sizeof(mvp.m));

    auto& blend                = _customCommand.getPipelineDescriptor().blendDescriptor;
    blend.blendEnabled         = true;
    blend.sourceRGBBlendFactor = blend.sourceAlphaBlendFactor = _blendFunc.src;
    blend.destinationRGBBlendFactor = blend.destinationAlphaBlendFactor = _blendFunc.dst;

    CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1, _bufferLines.size());
}

void DrawNode3D::drawLine(const Vec3& from, const Vec3& to, const Color4F& color)
{
    unsigned int vertex_count = 2;
    ensureCapacity(vertex_count);

    Color4B col = Color4B(color);
    V3F_C4B a   = {Vec3(from.x, from.y, from.z), col};
    V3F_C4B b   = {
        Vec3(to.x, to.y, to.z),
        col,
    };

    _bufferLines.push_back(a);
    _bufferLines.push_back(b);

    _isDirty = true;
}

void DrawNode3D::drawCube(Vec3* vertices, const Color4F& color)
{
    // front face
    drawLine(vertices[0], vertices[1], color);
    drawLine(vertices[1], vertices[2], color);
    drawLine(vertices[2], vertices[3], color);
    drawLine(vertices[3], vertices[0], color);

    // back face
    drawLine(vertices[4], vertices[5], color);
    drawLine(vertices[5], vertices[6], color);
    drawLine(vertices[6], vertices[7], color);
    drawLine(vertices[7], vertices[4], color);

    // edge
    drawLine(vertices[0], vertices[7], color);
    drawLine(vertices[1], vertices[6], color);
    drawLine(vertices[2], vertices[5], color);
    drawLine(vertices[3], vertices[4], color);
}

void DrawNode3D::clear()
{
    _bufferLines.clear();
    _isDirty = true;
}

const BlendFunc& DrawNode3D::getBlendFunc() const
{
    return _blendFunc;
}

void DrawNode3D::setBlendFunc(const BlendFunc& blendFunc)
{
    _blendFunc = blendFunc;
}

void DrawNode3D::onBeforeDraw()
{
    auto* renderer            = Director::getInstance()->getRenderer();
    _rendererDepthTestEnabled = renderer->getDepthTest();
    renderer->setDepthTest(true);
}

void DrawNode3D::onAfterDraw()
{
    auto* renderer = Director::getInstance()->getRenderer();
    renderer->setDepthTest(_rendererDepthTestEnabled);
}

NS_CC_END