axmol/core/3d/CCMotionStreak3D.cpp

/****************************************************************************
Copyright (c) 2011      ForzeField Studios S.L.
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axis-project.github.io/

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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/
#include "3d/CCMotionStreak3D.h"
#include <stddef.h>  // offsetof
#include "base/ccTypes.h"
#include "math/CCVertex.h"
#include "base/CCDirector.h"
#include "base/ccUtils.h"
#include "renderer/CCTextureCache.h"
#include "renderer/CCTexture2D.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCRenderState.h"
#include "renderer/ccShaders.h"

NS_AX_BEGIN

MotionStreak3D::MotionStreak3D()
    : _startingPositionInitialized(false)
    , _texture(nullptr)
    , _blendFunc(BlendFunc::ALPHA_NON_PREMULTIPLIED)
    , _positionR2D(0.f, 0.f)
    , _sweepAxis(0.f, 1.f, 0.f)
    , _stroke(0.0f)
    , _fadeDelta(0.0f)
    , _minSeg(0.0f)
    , _maxPoints(0)
    , _nuPoints(0)
    , _previousNuPoints(0)
{}

MotionStreak3D::~MotionStreak3D()
{
    AX_SAFE_RELEASE(_texture);
}

MotionStreak3D* MotionStreak3D::create(float fade,
                                       float minSeg,
                                       float stroke,
                                       const Color3B& color,
                                       std::string_view path)
{
    MotionStreak3D* ret = new MotionStreak3D();
    if (ret && ret->initWithFade(fade, minSeg, stroke, color, path))
    {
        ret->autorelease();
        return ret;
    }

    AX_SAFE_DELETE(ret);
    return nullptr;
}

MotionStreak3D* MotionStreak3D::create(float fade, float minSeg, float stroke, const Color3B& color, Texture2D* texture)
{
    MotionStreak3D* ret = new MotionStreak3D();
    if (ret && ret->initWithFade(fade, minSeg, stroke, color, texture))
    {
        ret->autorelease();
        return ret;
    }

    AX_SAFE_DELETE(ret);
    return nullptr;
}

bool MotionStreak3D::initWithFade(float fade, float minSeg, float stroke, const Color3B& color, std::string_view path)
{
    AXASSERT(!path.empty(), "Invalid filename");

    Texture2D* texture = _director->getTextureCache()->addImage(path);
    return initWithFade(fade, minSeg, stroke, color, texture);
}

bool MotionStreak3D::initWithFade(float fade, float minSeg, float stroke, const Color3B& color, Texture2D* texture)
{
    Node::setPosition(Vec2::ZERO);
    setAnchorPoint(Vec2::ZERO);
    setIgnoreAnchorPointForPosition(true);
    _startingPositionInitialized = false;

    _positionR.setZero();
    _minSeg = (minSeg == -1.0f) ? stroke / 5.0f : minSeg;
    _minSeg *= _minSeg;

    _stroke    = stroke;
    _fadeDelta = 1.0f / fade;

    _maxPoints = (int)(fade * 60.0f) + 2;
    _nuPoints  = 0;

    _pointState.resize(_maxPoints);
    _pointVertexes.resize(_maxPoints);

    _vertexData.resize(_maxPoints * 2);

    // Set blend mode
    _blendFunc = BlendFunc::ALPHA_NON_PREMULTIPLIED;

    // shader state
    auto* program = backend::Program::getBuiltinProgram(backend::ProgramType::POSITION_TEXTURE_COLOR);
    setProgramState(new backend::ProgramState(program), false);

    _customCommand.getPipelineDescriptor().programState = _programState;

    initCustomCommand();

    setTexture(texture);
    setColor(color);
    scheduleUpdate();

    return true;
}

void MotionStreak3D::initCustomCommand()
{
    _customCommand.setDrawType(CustomCommand::DrawType::ARRAY);
    _customCommand.setPrimitiveType(CustomCommand::PrimitiveType::TRIANGLE_STRIP);

    auto& pipelineDescriptor  = _customCommand.getPipelineDescriptor();
    auto layout               = _programState->getVertexLayout();
    const auto& attributeInfo = _programState->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,
                             offsetof(VertexData, color), true);
    }

    iter = attributeInfo.find("a_texCoord");
    if (iter != attributeInfo.end())
    {
        layout->setAttribute("a_texCoord", iter->second.location, backend::VertexFormat::FLOAT2,
                             offsetof(VertexData, texPos), false);
    }
    layout->setLayout(sizeof(VertexData));

    auto& blend                  = pipelineDescriptor.blendDescriptor;
    blend.blendEnabled           = true;
    blend.sourceAlphaBlendFactor = blend.sourceRGBBlendFactor = _blendFunc.src;
    blend.destinationAlphaBlendFactor = blend.destinationRGBBlendFactor = _blendFunc.dst;

    _locMVP     = _programState->getUniformLocation("u_MVPMatrix");
    _locTexture = _programState->getUniformLocation("u_tex0");

    _customCommand.createVertexBuffer(sizeof(VertexData), _vertexData.size(), CustomCommand::BufferUsage::DYNAMIC);
}

void MotionStreak3D::setPosition(const Vec2& position)
{
    if (!_startingPositionInitialized)
    {
        _startingPositionInitialized = true;
    }
    _positionR = Vec3(position.x, position.y, 0);
}

void MotionStreak3D::setPosition(float x, float y)
{
    if (!_startingPositionInitialized)
    {
        _startingPositionInitialized = true;
    }
    _positionR.x = x;
    _positionR.y = y;
}

void MotionStreak3D::setPosition3D(const Vec3& position)
{
    if (!_startingPositionInitialized)
    {
        _startingPositionInitialized = true;
    }
    _positionR = position;
}

void MotionStreak3D::setRotation3D(const Vec3& /*rotation*/) {}

void MotionStreak3D::setRotationQuat(const Quaternion& /*quat*/) {}

const Vec2& MotionStreak3D::getPosition() const
{
    _positionR2D.x = _positionR.x;
    _positionR2D.y = _positionR.y;
    return _positionR2D;
}

void MotionStreak3D::getPosition(float* x, float* y) const
{
    *x = _positionR.x;
    *y = _positionR.y;
}

float MotionStreak3D::getPositionX() const
{
    return _positionR.x;
}

Vec3 MotionStreak3D::getPosition3D() const
{
    return Vec3(_positionR.x, _positionR.y, getPositionZ());
}

void MotionStreak3D::setPositionX(float x)
{
    if (!_startingPositionInitialized)
    {
        _startingPositionInitialized = true;
    }
    _positionR.x = x;
}

float MotionStreak3D::getPositionY() const
{
    return _positionR.y;
}

void MotionStreak3D::setPositionY(float y)
{
    if (!_startingPositionInitialized)
    {
        _startingPositionInitialized = true;
    }
    _positionR.y = y;
}

void MotionStreak3D::tintWithColor(const Color3B& colors)
{
    setColor(colors);

    // Fast assignation
    for (unsigned int i = 0; i < _nuPoints * 2; i++)
    {
        auto& color = _vertexData[i].color;
        color.set(colors.r, colors.g, colors.b, color.a);
    }
}

Texture2D* MotionStreak3D::getTexture() const
{
    return _texture;
}

void MotionStreak3D::setTexture(Texture2D* texture)
{
    if (_texture != texture)
    {
        AX_SAFE_RETAIN(texture);
        AX_SAFE_RELEASE(_texture);
        _texture = texture;
        _programState->setTexture(_locTexture, 0, _texture->getBackendTexture());
    }
}

void MotionStreak3D::setBlendFunc(const BlendFunc& blendFunc)
{
    _blendFunc = blendFunc;
}

const BlendFunc& MotionStreak3D::getBlendFunc() const
{
    return _blendFunc;
}

void MotionStreak3D::setOpacity(uint8_t /*opacity*/)
{
    AXASSERT(false, "Set opacity no supported");
}

uint8_t MotionStreak3D::getOpacity() const
{
    AXASSERT(false, "Opacity no supported");
    return 0;
}

void MotionStreak3D::setOpacityModifyRGB(bool /*bValue*/) {}

bool MotionStreak3D::isOpacityModifyRGB() const
{
    return false;
}

void MotionStreak3D::update(float delta)
{
    if (!_startingPositionInitialized)
    {
        return;
    }

    delta *= _fadeDelta;

    unsigned int newIdx, newIdx2, i, i2;
    unsigned int mov = 0;

    // Update current points
    for (i = 0; i < _nuPoints; i++)
    {
        _pointState[i] -= delta;

        if (_pointState[i] <= 0)
            mov++;
        else
        {
            newIdx = i - mov;

            if (mov > 0)
            {
                // Move data
                _pointState[newIdx] = _pointState[i];

                // Move point
                _pointVertexes[newIdx] = _pointVertexes[i];

                // Move vertices
                i2                           = i * 2;
                newIdx2                      = newIdx * 2;
                _vertexData[newIdx2].pos     = _vertexData[i2].pos;
                _vertexData[newIdx2 + 1].pos = _vertexData[i2 + 1].pos;

                // Move color
                _vertexData[newIdx2].color     = _vertexData[i2].color;
                _vertexData[newIdx2 + 1].color = _vertexData[i2 + 1].color;
            }
            else
                newIdx2 = newIdx * 2;

            const uint8_t op                 = (uint8_t)(_pointState[newIdx] * 255.0f);
            _vertexData[newIdx2].color.a     = op;
            _vertexData[newIdx2 + 1].color.a = op;
        }
    }
    _nuPoints -= mov;

    // Append new point
    bool appendNewPoint = true;
    if (_nuPoints >= _maxPoints)
    {
        appendNewPoint = false;
    }

    else if (_nuPoints > 0)
    {
        bool a1 = (_pointVertexes[_nuPoints - 1] - _positionR).lengthSquared() < _minSeg;
        bool a2 = (_nuPoints == 1) ? false
                                   : ((_pointVertexes[_nuPoints - 2] - _positionR).lengthSquared() < (_minSeg * 2.0f));
        if (a1 || a2)
        {
            appendNewPoint = false;
        }
    }

    if (appendNewPoint)
    {
        _pointVertexes[_nuPoints] = _positionR;
        _pointState[_nuPoints]    = 1.0f;

        // Color assignment
        _vertexData[_nuPoints * 2].color     = Color4B(_displayedColor, 255);
        _vertexData[_nuPoints * 2 + 1].color = Color4B(_displayedColor, 255);

        // Generate polygon
        {
            float stroke                       = _stroke * 0.5f;
            _vertexData[_nuPoints * 2].pos     = _pointVertexes[_nuPoints] + (_sweepAxis * stroke);
            _vertexData[_nuPoints * 2 + 1].pos = _pointVertexes[_nuPoints] - (_sweepAxis * stroke);
        }

        _nuPoints++;
    }

    // Updated Tex Coords only if they are different than previous step
    if (_nuPoints && _previousNuPoints != _nuPoints)
    {
        float texDelta = 1.0f / _nuPoints;
        for (i = 0; i < _nuPoints; i++)
        {
            _vertexData[i * 2].texPos     = Tex2F(0, texDelta * i);
            _vertexData[i * 2 + 1].texPos = Tex2F(1, texDelta * i);
        }

        _previousNuPoints = _nuPoints;
    }
}

void MotionStreak3D::reset()
{
    _nuPoints = 0;
}

void MotionStreak3D::draw(Renderer* renderer, const Mat4& transform, uint32_t flags)
{
    if (_nuPoints <= 1)
        return;
    auto beforeCommand = renderer->nextCallbackCommand();
    auto afterCommand = renderer->nextCallbackCommand();

    beforeCommand->init(_globalZOrder);
    afterCommand->init(_globalZOrder);
    _customCommand.init(_globalZOrder, transform, flags);

    auto pmatrix   = _director->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);
    auto mvpMatrix = pmatrix * transform;

    _programState->setUniform(_locMVP, mvpMatrix.m, sizeof(mvpMatrix.m));

    beforeCommand->func = AX_CALLBACK_0(MotionStreak3D::onBeforeDraw, this);
    afterCommand->func  = AX_CALLBACK_0(MotionStreak3D::onAfterDraw, this);

    _customCommand.updateVertexBuffer(_vertexData.data(), sizeof(_vertexData[0]) * _nuPoints * 2);

    _customCommand.setVertexDrawInfo(0, _nuPoints * 2);

    renderer->addCommand(beforeCommand);
    renderer->addCommand(&_customCommand);
    renderer->addCommand(afterCommand);
    AX_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1, _nuPoints * 2);
}

void MotionStreak3D::onBeforeDraw()
{
    auto* renderer     = _director->getRenderer();
    _rendererDepthTest = renderer->getDepthTest();
    _rendererCullface  = renderer->getCullMode();

    renderer->setCullMode(CullMode::NONE);
    renderer->setDepthTest(true);
}

void MotionStreak3D::onAfterDraw()
{
    auto* renderer = _director->getRenderer();
    renderer->setDepthTest(_rendererDepthTest);
    renderer->setCullMode(_rendererCullface);
}

NS_AX_END