画一个旋转的立方体

//画立方体#include <iostream>
#define GLEW_STATIC
#include"Shader.h"
#include"Camera.h"
#include<GL/glew.h>#include<GLFW/glfw3.h>#include<glm/glm.hpp>
#include<glm/gtc/matrix_transform.hpp>
#include<glm/gtc/type_ptr.hpp>int main()
{glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);int WIDTH = 800, HEIGHT = 600;GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT,"Learn OpenGL ", nullptr, nullptr);int screenWidth, screenHeight;glfwGetFramebufferSize(window, &screenWidth, &screenHeight);if (window == nullptr) {std::cout << "Failed to creat GLFW window" << std::endl;glfwTerminate();return -1;}glfwMakeContextCurrent(window);glewExperimental = GL_TRUE;if (glewInit() != GLEW_OK) {std::cout << "Failed to initialize GLEW" << std::endl;glfwTerminate();return -1;}//允许深度测试glEnable(GL_DEPTH_TEST);glDepthFunc(GL_LESS);Shader shader = Shader("res/shaders/code.vs", "res/shaders/code.fs");//CubeGLfloat vertices[] = {//position              //color//back-0.5f,-0.5f,-0.5f,      1.0f,0.0f,0.0f,0.5f,-0.5f,-0.5f,       1.0f,0.0f,0.0f,0.5f,0.5f,-0.5f,        1.0f,0.0f,0.0f,0.5f,0.5f,-0.5f,        1.0f,0.0f,0.0f,-0.5f,0.5f,-0.5f,       1.0f,0.0f,0.0f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,0.0f,//front-0.5f,-0.5f,0.5f,      0.0f,1.0f,0.0f,0.5f,-0.5f,0.5f,       0.0f,1.0f,0.0f,0.5f,0.5f,0.5f,        0.0f,1.0f,0.0f,0.5f,0.5f,0.5f,        0.0f,1.0f,0.0f,-0.5f,0.5f,0.5f,       0.0f,1.0f,0.0f,-0.5f,-0.5f,0.5f,      0.0f,1.0f,0.0f,//left-0.5f,0.5f,0.5f,        0.0f,0.0f,1.0f,-0.5f,0.5f,-0.5f,       0.0f,0.0f,1.0f,-0.5f,-0.5f,-0.5f,      0.0f,0.0f,1.0f,-0.5f,-0.5f,-0.5f,      0.0f,0.0f,1.0f,-0.5f,-0.5f,0.5f,       0.0f,0.0f,1.0f,-0.5f,0.5f,0.5f,        0.0f,0.0f,1.0f,//right0.5f,0.5f,0.5f,         0.0f,1.0f,1.0f,0.5f,0.5f,-0.5f,        0.0f,1.0f,1.0f,0.5f,-0.5f,-0.5f,       0.0f,1.0f,1.0f,0.5f,-0.5f,-0.5f,       0.0f,1.0f,1.0f,0.5f,-0.5f,0.5f,        0.0f,1.0f,1.0f,0.5f,0.5f,0.5f,         0.0f,1.0f,1.0f,//bottom-0.5f,-0.5f,-0.5f,      1.0f,0.0f,1.0f,0.5f,-0.5f,-0.5f,       1.0f,0.0f,1.0f,0.5f,-0.5f,0.5f,        1.0f,0.0f,1.0f,0.5f,-0.5f,0.5f,        1.0f,0.0f,1.0f,-0.5f,-0.5f,0.5f,       1.0f,0.0f,1.0f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,1.0f,//up-0.5f,0.5f,-0.5f,       1.0f,1.0f,0.0f,0.5f,0.5f,-0.5f,        1.0f,1.0f,0.0f,0.5f,0.5f,0.5f,         1.0f,1.0f,0.0f,0.5f,0.5f,0.5f,         1.0f,1.0f,0.0f,-0.5f,0.5f,0.5f,        1.0f,1.0f,0.0f,-0.5f,0.5f,-0.5f,       1.0f,1.0f,0.0f,};GLuint VAO, VBO;glGenVertexArrays(1, &VAO);glGenBuffers(1, &VBO);glBindVertexArray(VAO);glBindBuffer(GL_ARRAY_BUFFER, VBO);glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);glEnableVertexAttribArray(0);glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));glEnableVertexAttribArray(1);glBindBuffer(GL_ARRAY_BUFFER, 0);glBindVertexArray(0);while (!glfwWindowShouldClose(window)) {glViewport(0, 0, screenWidth, screenHeight);glfwPollEvents();DoMovement();glClearColor(0.2f, 0.3f, 0.3f, 1.0f);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);//初始化深度shader.Use();glm::mat4 transform = glm::mat4(1.0f);//生成一个4x4单位矩阵//旋转变化transform = glm::rotate(transform, glm::radians(20.0f)*static_cast<GLfloat>(glfwGetTime()), glm::vec3(1.0f, 1.0f, 1.0f));//平移transform = glm::translate(transform, glm::vec3(0.0f, 0.4f, 0.0f));//缩放transform = glm::scale(transform, glm::vec3(0.5f, 0.5f, 0.5f));GLuint transLoc = glGetUniformLocation(shader.Program, "transform");//找到transform的位置glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(transform));//只传一个矩阵，所以变量是1glBindVertexArray(VAO);glDrawArrays(GL_TRIANGLES,0,36);glBindVertexArray(0);glfwSwapBuffers(window);}glDeleteVertexArrays(1, &VAO);glDeleteBuffers(1, &VBO);glfwTerminate();return 0;
}

如果旋转、平移、变换操作调换了顺序，正方体的运动方式会发生改变，具体如何变化可自行尝试。
Shader.h

#pragma once
#include<string>
#include<fstream>
#include<sstream>
#include<iostream>
#include<GL/glew.h>class Shader {GLuint vertex, fragment;
public:GLuint Program;Shader(const GLchar* vertexPath, const GLchar* fragmentPath){std::string vertexCode;std::string fragmentCode;std::ifstream vShaderFile;std::ifstream fShaderFile;vShaderFile.exceptions(std::ifstream::badbit);fShaderFile.exceptions(std::ifstream::badbit);try {vShaderFile.open(vertexPath);fShaderFile.open(fragmentPath);std::stringstream vShaderStream, fShaderStream;vShaderStream << vShaderFile.rdbuf();fShaderStream << fShaderFile.rdbuf();//文件关闭顺序，先 v 再 fvShaderFile.close();fShaderFile.close();vertexCode = vShaderStream.str();fragmentCode = fShaderStream.str();}catch (std::ifstream::failure a) {std::cout <<"ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ"<< std::endl;}const GLchar* vShaderCode = vertexCode.c_str();const GLchar* fShaderCode = fragmentCode.c_str();vertex = glCreateShader(GL_VERTEX_SHADER);  glShaderSource(vertex, 1, &vShaderCode, NULL);glCompileShader(vertex);  GLint success;GLchar infoLog[512];glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);  if (!success) {glGetShaderInfoLog(vertex, 512, NULL, infoLog);std::cout <<"ERROR::SHADER::VERTEX::COMPILATION_FAILED\n"<< infoLog << std::endl;}fragment = glCreateShader(GL_FRAGMENT_SHADER);glShaderSource(fragment, 1, &fShaderCode, NULL);glCompileShader(fragment);  glGetShaderiv(fragment, GL_COMPILE_STATUS, &success); if (!success) {glGetShaderInfoLog(fragment, 512, NULL, infoLog);std::cout <<"ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n"<< infoLog << std::endl;}this->Program = glCreateProgram(); glAttachShader(this->Program, vertex);glAttachShader(this->Program, fragment);glLinkProgram(this->Program);  glValidateProgram(this->Program);  glGetProgramiv(this->Program, GL_LINK_STATUS, &success);if (!success) {glGetProgramInfoLog(this->Program, 512, NULL, infoLog);  std::cout <<"ERROR::SHADER::PROGRAM::LINKING_FAILED\n" <<infoLog << std::endl;}}~Shader() {glDetachShader(this->Program, vertex);glDetachShader(this->Program, fragment);glDeleteShader(vertex);glDeleteShader(fragment);glDeleteProgram(this->Program);}void Use() {glUseProgram(this->Program);}
};

code.vs

#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 color;
out vec3 Color;
uniform mat4 transform;void main(){gl_Position = transform * vec4(position, 1.0f);Color = color;
}

code.fs

#version 330 core
in vec3 Color;
out vec4 color;void main(){color = vec4(Color, 1.0f);
}

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