计算机图形学 实验二 三维模型读取与控制

#include "Angel.h" #include "TriMesh.h" #include <vector> #include <string> //#include "main.h" using namespace std; const int X_AXIS = 0; const int Y_AXIS = 1; const int Z_AXIS = 2; const int TRANSFORM_SCALE = 0; const int TRANSFORM_ROTATE = 1; const int TRANSFORM_TRANSLATE = 2; const double DELTA_DELTA = 0.3; // Delta的变化率 const double DEFAULT_DELTA = 0.5; // 默认的Delta值 double scaleDelta = DEFAULT_DELTA; double rotateDelta = DEFAULT_DELTA; double translateDelta = DEFAULT_DELTA; glm::vec3 scaleTheta(1.0, 1.0, 1.0); // 缩放控制变量 glm::vec3 rotateTheta(0.0, 0.0, 0.0); // 旋转控制变量 glm::vec3 translateTheta(0.0, 0.0, 0.0); // 平移控制变量 int currentTransform = TRANSFORM_ROTATE; // 设置当前变换 int mainWindow; //------------------------------------------------------------------------ bool isplaying = true; // 动画状态 int rotationAxis = X_AXIS; // 当前旋转轴，默认为 X 轴 int rotationTime = 1000; // 每1000帧旋转一次 string currentModel ="cow"; struct openGLObject { // 顶点数组对象 GLuint vao; // 顶点缓存对象 GLuint vbo; // 着色器程序 GLuint program; // 着色器文件 std::string vshader; std::string fshader; // 着色器变量 GLuint pLocation; GLuint cLocation; GLuint matrixLocation; GLuint darkLocation; }; openGLObject cube_object; TriMesh* cube = new TriMesh(); void framebuffer_size_callback(GLFWwindow* window, int width, int height) { glViewport(0, 0, width, height); } void bindObjectAndData(TriMesh* mesh, openGLObject& object, const std::string& vshader, const std::string& fshader) { // 创建顶点数组对象 glGenVertexArrays(1, &object.vao); // 分配1个顶点数组对象 glBindVertexArray(object.vao); // 绑定顶点数组对象 // 创建并初始化顶点缓存对象 glGenBuffers(1, &object.vbo); glBindBuffer(GL_ARRAY_BUFFER, object.vbo); glBufferData(GL_ARRAY_BUFFER, mesh->getPoints().size() * sizeof(glm::vec3) + mesh->getColors().size() * sizeof(glm::vec3), NULL, GL_STATIC_DRAW); // @TODO: Task3-修改完TriMesh.cpp的代码成后再打开下面注释，否则程序会报错 glBufferSubData(GL_ARRAY_BUFFER, 0, mesh->getPoints().size() * sizeof(glm::vec3), &mesh->getPoints()[0]); glBufferSubData(GL_ARRAY_BUFFER, mesh->getPoints().size() * sizeof(glm::vec3), mesh->getColors().size() * sizeof(glm::vec3), &mesh->getColors()[0]); object.vshader = vshader; object.fshader = fshader; object.program = InitShader(object.vshader.c_str(), object.fshader.c_str()); // 从顶点着色器中初始化顶点的位置 object.pLocation = glGetAttribLocation(object.program, "vPosition"); glEnableVertexAttribArray(object.pLocation); glVertexAttribPointer(object.pLocation, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0)); // 从顶点着色器中初始化顶点的颜色 object.cLocation = glGetAttribLocation(object.program, "vColor"); glEnableVertexAttribArray(object.cLocation); glVertexAttribPointer(object.cLocation, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(mesh->getPoints().size() * sizeof(glm::vec3))); // 获得矩阵存储位置 object.matrixLocation = glGetUniformLocation(object.program, "matrix"); } void init() { std::string vshader, fshader; // 读取着色器文件路径 vshader = "shaders/vshader.glsl"; fshader = "shaders/fshader.glsl"; //cube->generateCube(); //cube->readOff("./Models/cow.off"); if (currentModel == "cow") { cube->readOff("./Models/cow.off"); } else { cube->generateCube(); } bindObjectAndData(cube, cube_object, vshader, fshader); // 设置背景色为黑色 glClearColor(0.0, 0.0, 0.0, 1.0); } // 渲染函数 void display() { // 清空颜色缓冲和深度缓冲 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glUseProgram(cube_object.program); glBindVertexArray(cube_object.vao); // 初始化变换矩阵 glm::mat4表示 4x4 矩阵 glm::mat4 m(1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0); // @TODO: Task4-在此处修改函数，计算最终的变换矩阵 // 调用函数传入三种变化的变化量，累加得到变化矩阵 // 注意三种变化累加的顺序 // 构建旋转矩阵 glm::mat4 rotationMatrix = glm::rotate(glm::mat4(1.0), rotateTheta.x, glm::vec3(1.0, 0.0, 0.0)) * glm::rotate(glm::mat4(1.0), rotateTheta.y, glm::vec3(0.0, 1.0, 0.0)) * glm::rotate(glm::mat4(1.0), rotateTheta.z, glm::vec3(0.0, 0.0, 1.0)); // 构建缩放矩阵 glm::mat4 scaleMatrix = glm::scale(glm::mat4(1.0), glm::vec3(scaleTheta.x, scaleTheta.y, scaleTheta.z)); // 构建平移矩阵 glm::mat4 translateMatrix = glm::translate(glm::mat4(1.0), glm::vec3(translateTheta.x, translateTheta.y, translateTheta.z)); // 按照平移、旋转、缩放的顺序相乘得到最终的变换矩阵 m = translateMatrix * rotationMatrix * scaleMatrix; // 传递变换矩阵到着色器 glUniformMatrix4fv(cube_object.matrixLocation, 1, GL_FALSE, glm::value_ptr(m)); // 绘制立方体中的各个三角形 glDrawArrays(GL_TRIANGLES, 0, cube->getPoints().size()); } // 通过Delta值更新Theta // axis 表示坐标轴，sign 表示增加或减少 // currentTransform 表示当前变换类型 void updateTheta(int axis, int sign) { switch (currentTransform) { // 根据变换类型，增加或减少某种变换的变化量 case TRANSFORM_SCALE: //增加或减少缩放的 Theta 值 scaleTheta[axis] += sign * scaleDelta; break; case TRANSFORM_ROTATE: //增加或减少旋转的 Theta 值 rotateTheta[axis] += sign * rotateDelta; break; case TRANSFORM_TRANSLATE: //增加或减少平移的 Theta 值 translateTheta[axis] += sign * translateDelta; break; } } // 复原Theta和Delta void resetTheta() { scaleTheta = glm::vec3(1.0, 1.0, 1.0); //scaleTheta 表示缩放变换的角度 rotateTheta = glm::vec3(0.0, 0.0, 0.0); translateTheta = glm::vec3(0.0, 0.0, 0.0); scaleDelta = DEFAULT_DELTA; //缩放变换的单位变化量 rotateDelta = DEFAULT_DELTA; translateDelta = DEFAULT_DELTA; } // 更新变化Delta值 void updateDelta(int sign) { switch (currentTransform) { // 根据变化类型增加或减少每一次变化的单位变化量 case TRANSFORM_SCALE: scaleDelta += sign * DELTA_DELTA; break; case TRANSFORM_ROTATE: rotateDelta += sign * DELTA_DELTA; break; case TRANSFORM_TRANSLATE: translateDelta += sign * DELTA_DELTA; break; } } void cleanData(); // 处理键盘输入的回调函数 void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode) { switch (key) { // 退出。 case GLFW_KEY_ESCAPE: if (action == GLFW_PRESS) glfwSetWindowShouldClose(window, GL_TRUE); break; // 1：缩放模式 case GLFW_KEY_1: if (action == GLFW_PRESS) currentTransform = TRANSFORM_SCALE; break; // 2: 旋转模式 case GLFW_KEY_2: if (action == GLFW_PRESS) currentTransform = TRANSFORM_ROTATE; break; // 3: 移动模式 case GLFW_KEY_3: if (action == GLFW_PRESS) currentTransform = TRANSFORM_TRANSLATE; break; // 4: 绘制线。 case GLFW_KEY_4: if (action == GLFW_PRESS) glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); break; // 5: 绘制面。 case GLFW_KEY_5: if (action == GLFW_PRESS) glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); break; // Q: 增加 x。 case GLFW_KEY_Q: if (action == GLFW_PRESS || action == GLFW_REPEAT) updateTheta(X_AXIS, 1); break; // A: 减少 x。 case GLFW_KEY_A: if (action == GLFW_PRESS || action == GLFW_REPEAT) updateTheta(X_AXIS, -1); break; // W: 增加 y。 case GLFW_KEY_W: if (action == GLFW_PRESS || action == GLFW_REPEAT) updateTheta(Y_AXIS, 1); break; // S: 减少 y。 case GLFW_KEY_S: if (action == GLFW_PRESS || action == GLFW_REPEAT) updateTheta(Y_AX