qt opengl assimp 加载骨骼动画完整代码

以下是使用 Qt、OpenGL 和 Assimp 加载骨骼动画的完整代码示例：

#include <QApplication>
#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>
#include <iostream>
#include <vector>

struct Vertex {
    QVector3D position;
    QVector2D texCoord;
    QVector3D normal;
    QVector3D tangent;
    QVector3D bitangent;
};

struct Texture {
    GLuint id;
    QString type;
    aiString path;
};

struct Bone {
    QString name;
    int parentIndex;
    QMatrix4x4 offset;
};

struct VertexBoneData {
    QVector<int> IDs;
    QVector<float> weights;
};

class Model {
public:
    Model(const QString& path) {
        Assimp::Importer importer;
        const aiScene* scene = importer.ReadFile(path.toStdString(), aiProcess_Triangulate | aiProcess_FlipUVs | aiProcess_CalcTangentSpace | aiProcess_JoinIdenticalVertices);

        if (!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) {
            std::cerr << "ERROR::ASSIMP::" << importer.GetErrorString() << std::endl;
            return;
        }

        directory = path.left(path.lastIndexOf('/'));

        processNode(scene->mRootNode, scene);
    }

    void draw(QOpenGLShaderProgram& shader) {
        for (int i = 0; i < meshes.size(); ++i) {
            meshes[i].draw(shader);
        }
    }

private:
    void processNode(aiNode* node, const aiScene* scene) {
        for (int i = 0; i < node->mNumMeshes; ++i) {
            aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
            meshes.append(processMesh(mesh, scene));
        }

        for (int i = 0; i < node->mNumChildren; ++i) {
            processNode(node->mChildren[i], scene);
        }
    }

    QOpenGLTexture* loadTexture(const QString& path) {
        QOpenGLTexture* texture = new QOpenGLTexture(QImage(directory + "/" + path).mirrored());
        texture->setMinificationFilter(QOpenGLTexture::LinearMipMapLinear);
        texture->setMagnificationFilter(QOpenGLTexture::Linear);
        texture->setWrapMode(QOpenGLTexture::Repeat);

        return texture;
    }

    Mesh processMesh(aiMesh* mesh, const aiScene* scene) {
        QVector<Vertex> vertices;
        QVector<GLuint> indices;
        QVector<Texture> textures;
        QVector<VertexBoneData> boneData(mesh->mNumVertices);

        for (int i = 0; i < mesh->mNumVertices; ++i) {
            Vertex vertex;

            vertex.position = QVector3D(mesh->mVertices[i].x, mesh->mVertices[i].y, mesh->mVertices[i].z);
            vertex.texCoord = mesh->HasTextureCoords(0) ? QVector2D(mesh->mTextureCoords[0][i].x, mesh->mTextureCoords[0][i].y) : QVector2D(0, 0);
            vertex.normal = QVector3D(mesh->mNormals[i].x, mesh->mNormals[i].y, mesh->mNormals[i].z);
            vertex.tangent = QVector3D(mesh->mTangents[i].x, mesh->mTangents[i].y, mesh->mTangents[i].z);
            vertex.bitangent = QVector3D(mesh->mBitangents[i].x, mesh->mBitangents[i].y, mesh->mBitangents[i].z);

            vertices.append(vertex);
        }

        for (int i = 0; i < mesh->mNumFaces; ++i) {
            aiFace face = mesh->mFaces[i];

            for (int j = 0; j < face.mNumIndices; ++j) {
                indices.append(face.mIndices[j]);
            }
        }

        if (mesh->mMaterialIndex >= 0) {
            aiMaterial* material = scene->mMaterials[mesh->mMaterialIndex];

            QVector<Texture> diffuseMaps = loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse");
            textures.append(diffuseMaps);

            QVector<Texture> specularMaps = loadMaterialTextures(material, aiTextureType_SPECULAR, "texture_specular");
            textures.append(specularMaps);

            QVector<Texture> normalMaps = loadMaterialTextures(material, aiTextureType_HEIGHT, "texture_normal");
            textures.append(normalMaps);

            QVector<Texture> heightMaps = loadMaterialTextures(material, aiTextureType_AMBIENT, "texture_height");
            textures.append(heightMaps);
        }

        QVector<Bone> bones = processBones(mesh);

        return Mesh(vertices, indices, textures, bones, boneData);
    }

    QVector<Texture> loadMaterialTextures(aiMaterial* mat, aiTextureType type, const QString& typeName) {
        QVector<Texture> textures;

        for (int i = 0; i < mat->GetTextureCount(type); ++i) {
            aiString str;
            mat->GetTexture(type, i, &str);
            bool skip = false;

            for (int j = 0; j < loadedTextures.size(); ++j) {
                if (std::strcmp(loadedTextures[j].path.C_Str(), str.C_Str()) == 0) {
                    textures.append(loadedTextures[j]);
                    skip = true;
                    break;
                }
            }

            if (!skip) {
                Texture texture;
                texture.id = loadTexture(str.C_Str())->textureId();
                texture.type = typeName;
                texture.path = str;
                textures.append(texture);
                loadedTextures.append(texture);
            }
        }

        return textures;
    }

    QVector<Bone> processBones(aiMesh* mesh) {
        QVector<Bone> bones;

        for (int i = 0; i < mesh->mNumBones; ++i) {
            aiBone* bone = mesh->mBones[i];
            Bone newBone;
            newBone.name = bone->mName.C_Str();
            newBone.parentIndex = -1;
            newBone.offset = QMatrix4x4(&bone->mOffsetMatrix.a1);

            for (int j = 0; j < nodes.size(); ++j) {
                if (nodes[j].name == bone->mName.C_Str()) {
                    newBone.parentIndex = nodes[j].parentIndex;
                    break;
                }
            }

            bones.append(newBone);

            for (int j = 0; j < bone->mNumWeights; ++j) {
                int vertexID = bone->mWeights[j].mVertexId;
                float weight = bone->mWeights[j].mWeight;

                for (int k = 0; k < boneData[vertexID].IDs.size(); ++k) {
                    if (weight > boneData[vertexID].weights[k]) {
                        boneData[vertexID].IDs.insert(k, i);
                        boneData[vertexID].weights.insert(k, weight);
                        break;
                    }
                }

                if (boneData[vertexID].IDs.size() < 4) {
                    boneData[vertexID].IDs.append(i);
                    boneData[vertexID].weights.append(weight);
                }
            }
        }

        return bones;
    }

    struct Node {
        QString name;
        int parentIndex;
    };

    class Mesh {
    public:
        Mesh(const QVector<Vertex>& vertices, const QVector<GLuint>& indices, const QVector<Texture>& textures, const QVector<Bone>& bones, const QVector<VertexBoneData>& boneData) {
            this->textures = textures;
            this->bones = bones;

            glGenVertexArrays(1, &VAO);
            glGenBuffers(1, &VBO);
            glGenBuffers(1, &EBO);

            glBindVertexArray(VAO);

            glBindBuffer(GL_ARRAY_BUFFER, VBO);
            glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW);

            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
            glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), indices.data(), GL_STATIC_DRAW);

            glEnableVertexAttribArray(0);
            glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, position));

            glEnableVertexAttribArray(1);
            glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, texCoord));

            glEnableVertexAttribArray(2);
            glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, normal));

            glEnableVertexAttribArray(3);
            glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, tangent));

            glEnableVertexAttribArray(4);
            glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, bitangent));

            glGenBuffers(1, &boneBuffer);
            glBindBuffer(GL_ARRAY_BUFFER, boneBuffer);
            glBufferData(GL_ARRAY_BUFFER, boneData.size() * sizeof(VertexBoneData), boneData.data(), GL_STATIC_DRAW);

            glEnableVertexAttribArray(5);
            glVertexAttribIPointer(5, 4, GL_INT, sizeof(VertexBoneData), (void*)0);

            glEnableVertexAttribArray(6);
            glVertexAttribPointer(6, 4, GL_FLOAT, GL_FALSE, sizeof(VertexBoneData), (void*)(4 * sizeof(int)));

            glBindVertexArray(0);
        }

        void draw(QOpenGLShaderProgram& shader) {
            for (int i = 0; i < textures.size(); ++i) {
                glActiveTexture(GL_TEXTURE0 + i);
                shader.setUniformValue((textures[i].type + QString::number(i)).toStdString().c_str(), i);
                glBindTexture(GL_TEXTURE_2D, textures[i].id);
            }

            glBindVertexArray(VAO);
            glDrawElements(GL_TRIANGLES, indicesCount, GL_UNSIGNED_INT, 0);
            glBindVertexArray(0);

            glActiveTexture(GL_TEXTURE0);
        }

        QVector<Texture> textures;
        QVector<Bone> bones;

    private:
        GLuint VAO, VBO, EBO, boneBuffer;
        int indicesCount;
    };

    QString directory;
    QVector<Mesh> meshes;
    QVector<Texture> loadedTextures;
    QVector<Node> nodes;
};

class ViewerWidget : public QOpenGLWidget, protected QOpenGLFunctions {
public:
    ViewerWidget(QWidget* parent = nullptr) : QOpenGLWidget(parent) {
        setFocusPolicy(Qt::StrongFocus);
    }

protected:
    void initializeGL() override {
        initializeOpenGLFunctions();

        glEnable(GL_DEPTH_TEST);

        shader.addShaderFromSourceFile(QOpenGLShader::Vertex, "vertex.glsl");
        shader.addShaderFromSourceFile(QOpenGLShader::Fragment, "fragment.glsl");
        shader.link();

        model = new Model("path/to/model.fbx");

        timer.start(16, this);
    }

    void resizeGL(int width, int height) override {
        glViewport(0, 0, width, height);
    }

    void paintGL() override {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        shader.bind();

        QMatrix4x4 view;
        view.translate(0, 0, -3);

        QMatrix4x4 projection;
        projection.perspective(45.0f, (float)width() / (float)height(), 0.1f, 100.0f);

        shader.setUniformValue("view", view);
        shader.setUniformValue("projection", projection);

        model->draw(shader);

        shader.release();
    }

    void timerEvent(QTimerEvent* event) override {
        model->updateAnimation(timer.elapsed() / 1000.0f);
        update();
    }

private:
    QOpenGLShaderProgram shader;
    Model* model;
    QElapsedTimer timer;
};

int main(int argc, char* argv[]) {
    QApplication app(argc, argv);

    ViewerWidget viewerWidget;
    viewerWidget.resize(640, 480);
    viewerWidget.show();

    return app.exec();
}

注意，这只是一个示例代码，可能需要根据具体情况进行调整和修改。