RedCore/cocos2d/cocos/3d/CCMesh.cpp

/****************************************************************************
 Copyright (c) 2014-2017 Chukong Technologies Inc.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "3d/CCMesh.h"
#include "3d/CCMeshSkin.h"
#include "3d/CCSkeleton3D.h"
#include "3d/CCMeshVertexIndexData.h"
#include "2d/CCLight.h"
#include "2d/CCScene.h"
#include "base/CCEventDispatcher.h"
#include "base/CCDirector.h"
#include "base/CCConfiguration.h"
#include "renderer/CCTextureCache.h"
#include "renderer/CCGLProgramState.h"
#include "renderer/CCMaterial.h"
#include "renderer/CCTechnique.h"
#include "renderer/CCPass.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCVertexAttribBinding.h"
#include "math/Mat4.h"

using namespace std;

NS_CC_BEGIN

// Helpers

//sampler uniform names, only diffuse and normal texture are supported for now
std::string s_uniformSamplerName[] =
{
    "",//NTextureData::Usage::Unknown,
    "",//NTextureData::Usage::None
    "",//NTextureData::Usage::Diffuse
    "",//NTextureData::Usage::Emissive
    "",//NTextureData::Usage::Ambient
    "",//NTextureData::Usage::Specular
    "",//NTextureData::Usage::Shininess
    "u_normalTex",//NTextureData::Usage::Normal
    "",//NTextureData::Usage::Bump
    "",//NTextureData::Usage::Transparency
    "",//NTextureData::Usage::Reflection
};

static const char          *s_dirLightUniformColorName = "u_DirLightSourceColor";
static const char          *s_dirLightUniformDirName = "u_DirLightSourceDirection";

static const char          *s_pointLightUniformColorName = "u_PointLightSourceColor";
static const char          *s_pointLightUniformPositionName = "u_PointLightSourcePosition";
static const char          *s_pointLightUniformRangeInverseName = "u_PointLightSourceRangeInverse";

static const char          *s_spotLightUniformColorName = "u_SpotLightSourceColor";
static const char          *s_spotLightUniformPositionName = "u_SpotLightSourcePosition";
static const char          *s_spotLightUniformDirName = "u_SpotLightSourceDirection";
static const char          *s_spotLightUniformInnerAngleCosName = "u_SpotLightSourceInnerAngleCos";
static const char          *s_spotLightUniformOuterAngleCosName = "u_SpotLightSourceOuterAngleCos";
static const char          *s_spotLightUniformRangeInverseName = "u_SpotLightSourceRangeInverse";

static const char          *s_ambientLightUniformColorName = "u_AmbientLightSourceColor";

// helpers
void Mesh::resetLightUniformValues()
{
    const auto& conf = Configuration::getInstance();
    int maxDirLight = conf->getMaxSupportDirLightInShader();
    int maxPointLight = conf->getMaxSupportPointLightInShader();
    int maxSpotLight = conf->getMaxSupportSpotLightInShader();

    _dirLightUniformColorValues.assign(maxDirLight, Vec3::ZERO);
    _dirLightUniformDirValues.assign(maxDirLight, Vec3::ZERO);

    _pointLightUniformColorValues.assign(maxPointLight, Vec3::ZERO);
    _pointLightUniformPositionValues.assign(maxPointLight, Vec3::ZERO);
    _pointLightUniformRangeInverseValues.assign(maxPointLight, 0.0f);

    _spotLightUniformColorValues.assign(maxSpotLight, Vec3::ZERO);
    _spotLightUniformPositionValues.assign(maxSpotLight, Vec3::ZERO);
    _spotLightUniformDirValues.assign(maxSpotLight, Vec3::ZERO);
    _spotLightUniformInnerAngleCosValues.assign(maxSpotLight, 1.0f);
    _spotLightUniformOuterAngleCosValues.assign(maxSpotLight, 0.0f);
    _spotLightUniformRangeInverseValues.assign(maxSpotLight, 0.0f);
}

//Generate a dummy texture when the texture file is missing
static Texture2D * getDummyTexture()
{
    auto texture = Director::getInstance()->getTextureCache()->getTextureForKey("/dummyTexture");
    if(!texture)
    {
#ifdef NDEBUG
        unsigned char data[] ={0,0,0,0};//1*1 transparent picture
#else
        unsigned char data[] ={255,0,0,255};//1*1 red picture
#endif
        Image * image =new (std::nothrow) Image();
        image->initWithRawData(data,sizeof(data),1,1,sizeof(unsigned char));
        texture=Director::getInstance()->getTextureCache()->addImage(image,"/dummyTexture");
        image->release();
    }
    return texture;
}


Mesh::Mesh()
: _skin(nullptr)
, _visible(true)
, _isTransparent(false)
, _force2DQueue(false)
, _meshIndexData(nullptr)
, _glProgramState(nullptr)
, _blend(BlendFunc::ALPHA_NON_PREMULTIPLIED)
, _blendDirty(true)
, _material(nullptr)
, _texFile("")
{
    
}
Mesh::~Mesh()
{
    for (auto &tex : _textures){
        CC_SAFE_RELEASE(tex.second);
    }
    CC_SAFE_RELEASE(_skin);
    CC_SAFE_RELEASE(_meshIndexData);
    CC_SAFE_RELEASE(_material);
    CC_SAFE_RELEASE(_glProgramState);
}

GLuint Mesh::getVertexBuffer() const
{
    return _meshIndexData->getVertexBuffer()->getVBO();
}

bool Mesh::hasVertexAttrib(int attrib) const
{
    return _meshIndexData->getMeshVertexData()->hasVertexAttrib(attrib);
}

ssize_t Mesh::getMeshVertexAttribCount() const
{
    return _meshIndexData->getMeshVertexData()->getMeshVertexAttribCount();
}

const MeshVertexAttrib& Mesh::getMeshVertexAttribute(int idx)
{
    return _meshIndexData->getMeshVertexData()->getMeshVertexAttrib(idx);
}

int Mesh::getVertexSizeInBytes() const
{
    return _meshIndexData->getVertexBuffer()->getSizePerVertex();
}

Mesh* Mesh::create(const std::vector<float>& positions, const std::vector<float>& normals, const std::vector<float>& texs, const IndexArray& indices)
{
    int perVertexSizeInFloat = 0;
    std::vector<float> vertices;
    std::vector<MeshVertexAttrib> attribs;
    MeshVertexAttrib att;
    att.size = 3;
    att.type = GL_FLOAT;
    att.attribSizeBytes = att.size * sizeof(float);
    
    if (positions.size())
    {
        perVertexSizeInFloat += 3;
        att.vertexAttrib = GLProgram::VERTEX_ATTRIB_POSITION;
        attribs.push_back(att);
    }
    if (normals.size())
    {
        perVertexSizeInFloat += 3;
        att.vertexAttrib = GLProgram::VERTEX_ATTRIB_NORMAL;
        attribs.push_back(att);
    }
    if (texs.size())
    {
        perVertexSizeInFloat += 2;
        att.vertexAttrib = GLProgram::VERTEX_ATTRIB_TEX_COORD;
        att.size = 2;
        att.attribSizeBytes = att.size * sizeof(float);
        attribs.push_back(att);
    }
    
    bool hasNormal = (normals.size() != 0);
    bool hasTexCoord = (texs.size() != 0);
    //position, normal, texCoordinate into _vertexs
    size_t vertexNum = positions.size() / 3;
    for(size_t i = 0; i < vertexNum; i++)
    {
        vertices.push_back(positions[i * 3]);
        vertices.push_back(positions[i * 3 + 1]);
        vertices.push_back(positions[i * 3 + 2]);

        if (hasNormal)
        {
            vertices.push_back(normals[i * 3]);
            vertices.push_back(normals[i * 3 + 1]);
            vertices.push_back(normals[i * 3 + 2]);
        }
    
        if (hasTexCoord)
        {
            vertices.push_back(texs[i * 2]);
            vertices.push_back(texs[i * 2 + 1]);
        }
    }
    return create(vertices, perVertexSizeInFloat, indices, attribs);
}

Mesh* Mesh::create(const std::vector<float>& vertices, int /*perVertexSizeInFloat*/, const IndexArray& indices, const std::vector<MeshVertexAttrib>& attribs)
{
    MeshData meshdata;
    meshdata.attribs = attribs;
    meshdata.vertex = vertices;
    meshdata.subMeshIndices.push_back(indices);
    meshdata.subMeshIds.push_back("");
    auto meshvertexdata = MeshVertexData::create(meshdata);
    auto indexData = meshvertexdata->getMeshIndexDataByIndex(0);
    
    return create("", indexData);
}

Mesh* Mesh::create(const std::string& name, MeshIndexData* indexData, MeshSkin* skin)
{
    auto state = new (std::nothrow) Mesh();
    state->autorelease();
    state->bindMeshCommand();
    state->_name = name;
    state->setMeshIndexData(indexData);
    state->setSkin(skin);
    
    return state;
}

void Mesh::setVisible(bool visible)
{
    if (_visible != visible)
    {
        _visible = visible;
        if (_visibleChanged)
            _visibleChanged();
    }
}

bool Mesh::isVisible() const
{
    return _visible;
}

void Mesh::setTexture(const std::string& texPath)
{
    _texFile = texPath;
    auto tex = Director::getInstance()->getTextureCache()->addImage(texPath);
    setTexture(tex, NTextureData::Usage::Diffuse);
}

void Mesh::setTexture(Texture2D* tex)
{
    setTexture(tex, NTextureData::Usage::Diffuse);
}

void Mesh::setTexture(Texture2D* tex, NTextureData::Usage usage, bool cacheFileName)
{
    // Texture must be saved for future use
    // it doesn't matter if the material is already set or not
    // This functionality is added for compatibility issues
    if (tex == nullptr)
        tex = getDummyTexture();
    
    CC_SAFE_RETAIN(tex);
    CC_SAFE_RELEASE(_textures[usage]);
    _textures[usage] = tex;   
    
    if (usage == NTextureData::Usage::Diffuse){
        if (_material) {
            auto technique = _material->_currentTechnique;
            for(auto& pass: technique->_passes)
            {
                // FIXME: Ideally it should use glProgramState->setUniformTexture()
                // and set CC_Texture0 that way. But trying to it, will trigger
                // another bug
                pass->setTexture(tex);
            }
        }
        
        bindMeshCommand();
        if (cacheFileName)
            _texFile = tex->getPath();
    }
    else if (usage == NTextureData::Usage::Normal) // currently only diffuse and normal are supported
    {
        if (_material){
            auto technique = _material->_currentTechnique;
            for(auto& pass: technique->_passes)
            {
                pass->getGLProgramState()->setUniformTexture(s_uniformSamplerName[(int)usage], tex);
            }
        }
    }
}

void Mesh::setTexture(const std::string& texPath, NTextureData::Usage usage)
{
    auto tex = Director::getInstance()->getTextureCache()->addImage(texPath);
    setTexture(tex, usage);
}

Texture2D* Mesh::getTexture() const
{
    return _textures.at(NTextureData::Usage::Diffuse);
}

Texture2D* Mesh::getTexture(NTextureData::Usage usage)
{
    return _textures[usage];
}

void Mesh::setMaterial(Material* material)
{
    if (_material != material) {
        CC_SAFE_RELEASE(_material);
        _material = material;
        CC_SAFE_RETAIN(_material);
    }

    if (_material)
    {
        for (auto technique: _material->getTechniques())
        {
            for (auto pass: technique->getPasses())
            {
                auto vertexAttribBinding = VertexAttribBinding::create(_meshIndexData, pass->getGLProgramState());
                pass->setVertexAttribBinding(vertexAttribBinding);
            }
        }
    }
    // Was the texture set before the GLProgramState ? Set it
    for(auto& tex : _textures)
        setTexture(tex.second, tex.first);
        
    
    if (_blendDirty)
        setBlendFunc(_blend);
    
    bindMeshCommand();
}

Material* Mesh::getMaterial() const
{
    return _material;
}

void Mesh::draw(Renderer* renderer, float globalZOrder, const Mat4& transform, uint32_t flags, unsigned int lightMask, const Vec4& color, bool forceDepthWrite)
{
    if (! isVisible())
        return;

    bool isTransparent = (_isTransparent || color.w < 1.f);
    float globalZ = isTransparent ? 0 : globalZOrder;
    if (isTransparent)
        flags |= Node::FLAGS_RENDER_AS_3D;

    _meshCommand.init(globalZ,
                      _material,
                      getVertexBuffer(),
                      getIndexBuffer(),
                      getPrimitiveType(),
                      getIndexFormat(),
                      getIndexCount(),
                      transform,
                      flags);


   if (isTransparent && !forceDepthWrite)
       _material->getStateBlock()->setDepthWrite(false);
   else
        _material->getStateBlock()->setDepthWrite(true);


    _meshCommand.setSkipBatching(isTransparent);
    _meshCommand.setTransparent(isTransparent);
    _meshCommand.set3D(!_force2DQueue);
    _material->getStateBlock()->setBlend(_force2DQueue || isTransparent);

    // set default uniforms for Mesh
    // 'u_color' and others
    const auto scene = Director::getInstance()->getRunningScene();
    auto technique = _material->_currentTechnique;
    for(const auto pass : technique->_passes)
    {
        auto programState = pass->getGLProgramState();
        programState->setUniformVec4("u_color", color);

        if (_skin)
            programState->setUniformVec4v("u_matrixPalette", (GLsizei)_skin->getMatrixPaletteSize(), _skin->getMatrixPalette());

        if (scene && scene->getLights().size() > 0)
            setLightUniforms(pass, scene, color, lightMask);
    }

    renderer->addCommand(&_meshCommand);
}

void Mesh::setSkin(MeshSkin* skin)
{
    if (_skin != skin)
    {
        CC_SAFE_RETAIN(skin);
        CC_SAFE_RELEASE(_skin);
        _skin = skin;
        calculateAABB();
    }
}

void Mesh::setMeshIndexData(MeshIndexData* subMesh)
{
    if (_meshIndexData != subMesh)
    {
        CC_SAFE_RETAIN(subMesh);
        CC_SAFE_RELEASE(_meshIndexData);
        _meshIndexData = subMesh;
        calculateAABB();
        bindMeshCommand();
    }
}

void Mesh::setGLProgramState(GLProgramState* glProgramState)
{
    // XXX create dummy texture
    auto material = Material::createWithGLStateProgram(glProgramState);
    if (_material)
        material->setStateBlock(_material->getStateBlock());
    setMaterial(material);
}

GLProgramState* Mesh::getGLProgramState() const
{
    return _material ?
                _material->_currentTechnique->_passes.at(0)->getGLProgramState()
                : nullptr;
}

void Mesh::calculateAABB()
{
    if (_meshIndexData)
    {
        _aabb = _meshIndexData->getAABB();
        if (_skin)
        {
            //get skin root
            Bone3D* root = nullptr;
            Mat4 invBindPose;
            if (_skin->_skinBones.size())
            {
                root = _skin->_skinBones.at(0);
                while (root) {
                    auto parent = root->getParentBone();
                    bool parentInSkinBone = false;
                    for (const auto& bone : _skin->_skinBones) {
                        if (bone == parent)
                        {
                            parentInSkinBone = true;
                            break;
                        }
                    }
                    if (!parentInSkinBone)
                        break;
                    root = parent;
                }
            }
            
            if (root)
            {
                _aabb.transform(root->getWorldMat() * _skin->getInvBindPose(root));
            }
        }
    }
}

void Mesh::bindMeshCommand()
{
    if (_material && _meshIndexData)
    {
        auto pass = _material->_currentTechnique->_passes.at(0);
        auto glprogramstate = pass->getGLProgramState();
        auto texture = pass->getTexture();
        auto textureid = texture ? texture->getName() : 0;
        // XXX
//        auto blend = pass->getStateBlock()->getBlendFunc();
        auto blend = BlendFunc::ALPHA_PREMULTIPLIED;

        _meshCommand.genMaterialID(textureid, glprogramstate, _meshIndexData->getVertexBuffer()->getVBO(), _meshIndexData->getIndexBuffer()->getVBO(), blend);
        _material->getStateBlock()->setCullFace(true);
        _material->getStateBlock()->setDepthTest(true);
    }
}

void Mesh::setLightUniforms(Pass* pass, Scene* scene, const Vec4& color, unsigned int lightmask)
{
    CCASSERT(pass, "Invalid Pass");
    CCASSERT(scene, "Invalid scene");

    const auto& conf = Configuration::getInstance();
    int maxDirLight = conf->getMaxSupportDirLightInShader();
    int maxPointLight = conf->getMaxSupportPointLightInShader();
    int maxSpotLight = conf->getMaxSupportSpotLightInShader();
    auto &lights = scene->getLights();

    auto glProgramState = pass->getGLProgramState();
    auto attributes = pass->getVertexAttributeBinding()->getVertexAttribsFlags();

    if (attributes & (1 << GLProgram::VERTEX_ATTRIB_NORMAL))
    {
        resetLightUniformValues();

        GLint enabledDirLightNum = 0;
        GLint enabledPointLightNum = 0;
        GLint enabledSpotLightNum = 0;
        Vec3 ambientColor;
        for (const auto& light : lights)
        {
            bool useLight = light->isEnabled() && ((unsigned int)light->getLightFlag() & lightmask);
            if (useLight)
            {
                float intensity = light->getIntensity();
                switch (light->getLightType())
                {
                    case LightType::DIRECTIONAL:
                    {
                        if(enabledDirLightNum < maxDirLight)
                        {
                            auto dirLight = static_cast<DirectionLight *>(light);
                            Vec3 dir = dirLight->getDirectionInWorld();
                            dir.normalize();
                            const Color3B &col = dirLight->getDisplayedColor();
                            _dirLightUniformColorValues[enabledDirLightNum].set(col.r / 255.0f * intensity, col.g / 255.0f * intensity, col.b / 255.0f * intensity);
                            _dirLightUniformDirValues[enabledDirLightNum] = dir;
                            ++enabledDirLightNum;
                        }

                    }
                        break;
                    case LightType::POINT:
                    {
                        if(enabledPointLightNum < maxPointLight)
                        {
                            auto pointLight = static_cast<PointLight *>(light);
                            Mat4 mat= pointLight->getNodeToWorldTransform();
                            const Color3B &col = pointLight->getDisplayedColor();
                            _pointLightUniformColorValues[enabledPointLightNum].set(col.r / 255.0f * intensity, col.g / 255.0f * intensity, col.b / 255.0f * intensity);
                            _pointLightUniformPositionValues[enabledPointLightNum].set(mat.m[12], mat.m[13], mat.m[14]);
                            _pointLightUniformRangeInverseValues[enabledPointLightNum] = 1.0f / pointLight->getRange();
                            ++enabledPointLightNum;
                        }
                    }
                        break;
                    case LightType::SPOT:
                    {
                        if(enabledSpotLightNum < maxSpotLight)
                        {
                            auto spotLight = static_cast<SpotLight *>(light);
                            Vec3 dir = spotLight->getDirectionInWorld();
                            dir.normalize();
                            Mat4 mat= light->getNodeToWorldTransform();
                            const Color3B &col = spotLight->getDisplayedColor();
                            _spotLightUniformColorValues[enabledSpotLightNum].set(col.r / 255.0f * intensity, col.g / 255.0f * intensity, col.b / 255.0f * intensity);
                            _spotLightUniformPositionValues[enabledSpotLightNum].set(mat.m[12], mat.m[13], mat.m[14]);
                            _spotLightUniformDirValues[enabledSpotLightNum] = dir;
                            _spotLightUniformInnerAngleCosValues[enabledSpotLightNum] = spotLight->getCosInnerAngle();
                            _spotLightUniformOuterAngleCosValues[enabledSpotLightNum] = spotLight->getCosOuterAngle();
                            _spotLightUniformRangeInverseValues[enabledSpotLightNum] = 1.0f / spotLight->getRange();
                            ++enabledSpotLightNum;
                        }
                    }
                        break;
                    case LightType::AMBIENT:
                    {
                        auto ambLight = static_cast<AmbientLight *>(light);
                        const Color3B &col = ambLight->getDisplayedColor();
                        ambientColor.add(col.r / 255.0f * intensity, col.g / 255.0f * intensity, col.b / 255.0f * intensity);
                    }
                        break;
                    default:
                        break;
                }
            }
        }

        if (0 < maxDirLight)
        {
            glProgramState->setUniformVec3v(s_dirLightUniformColorName, _dirLightUniformColorValues.size(), &_dirLightUniformColorValues[0]);
            glProgramState->setUniformVec3v(s_dirLightUniformDirName, _dirLightUniformDirValues.size(), &_dirLightUniformDirValues[0]);
        }

        if (0 < maxPointLight)
        {
            glProgramState->setUniformVec3v(s_pointLightUniformColorName, _pointLightUniformColorValues.size(), &_pointLightUniformColorValues[0]);
            glProgramState->setUniformVec3v(s_pointLightUniformPositionName, _pointLightUniformPositionValues.size(), &_pointLightUniformPositionValues[0]);
            glProgramState->setUniformFloatv(s_pointLightUniformRangeInverseName, _pointLightUniformRangeInverseValues.size(), &_pointLightUniformRangeInverseValues[0]);
        }

        if (0 < maxSpotLight)
        {
            glProgramState->setUniformVec3v(s_spotLightUniformColorName, _spotLightUniformColorValues.size(), &_spotLightUniformColorValues[0]);
            glProgramState->setUniformVec3v(s_spotLightUniformPositionName, _spotLightUniformPositionValues.size(), &_spotLightUniformPositionValues[0]);
            glProgramState->setUniformVec3v(s_spotLightUniformDirName, _spotLightUniformDirValues.size(), &_spotLightUniformDirValues[0]);
            glProgramState->setUniformFloatv(s_spotLightUniformInnerAngleCosName, _spotLightUniformInnerAngleCosValues.size(), &_spotLightUniformInnerAngleCosValues[0]);
            glProgramState->setUniformFloatv(s_spotLightUniformOuterAngleCosName, _spotLightUniformOuterAngleCosValues.size(), &_spotLightUniformOuterAngleCosValues[0]);
            glProgramState->setUniformFloatv(s_spotLightUniformRangeInverseName, _spotLightUniformRangeInverseValues.size(), &_spotLightUniformRangeInverseValues[0]);
        }

        glProgramState->setUniformVec3(s_ambientLightUniformColorName, Vec3(ambientColor.x, ambientColor.y, ambientColor.z));
    }
    else // normal does not exist
    {
        Vec3 ambient(0.0f, 0.0f, 0.0f);
        bool hasAmbient = false;
        for (const auto& light : lights)
        {
            if (light->getLightType() == LightType::AMBIENT)
            {
                bool useLight = light->isEnabled() && ((unsigned int)light->getLightFlag() & lightmask);
                if (useLight)
                {
                    hasAmbient = true;
                    const Color3B &col = light->getDisplayedColor();
                    ambient.x += col.r * light->getIntensity();
                    ambient.y += col.g * light->getIntensity();
                    ambient.z += col.b * light->getIntensity();
                }
            }
        }
        if (hasAmbient)
        {
            ambient.x /= 255.f; ambient.y /= 255.f; ambient.z /= 255.f;
            //override the uniform value of u_color using the calculated color 
            glProgramState->setUniformVec4("u_color", Vec4(color.x * ambient.x, color.y * ambient.y, color.z * ambient.z, color.w));
        }
    }
}

void Mesh::setBlendFunc(const BlendFunc &blendFunc)
{
    // Blend must be saved for future use
    // it doesn't matter if the material is already set or not
    // This functionality is added for compatibility issues
    if(_blend != blendFunc)
    {
        _blendDirty = true;
        _blend = blendFunc;
    }

    if (_material) {
        _material->getStateBlock()->setBlendFunc(blendFunc);
        bindMeshCommand();
    }
}

const BlendFunc& Mesh::getBlendFunc() const
{
// return _material->_currentTechnique->_passes.at(0)->getBlendFunc();
    return _blend;
}

GLenum Mesh::getPrimitiveType() const
{
    return _meshIndexData->getPrimitiveType();
}

ssize_t Mesh::getIndexCount() const
{
    return _meshIndexData->getIndexBuffer()->getIndexNumber();
}

GLenum Mesh::getIndexFormat() const
{
    return GL_UNSIGNED_SHORT;
}

GLuint Mesh::getIndexBuffer() const
{
    return _meshIndexData->getIndexBuffer()->getVBO();
}
NS_CC_END