feat(OpenGL): lab1
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iridiumR
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a3e1bc1e00
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@ -2,39 +2,6 @@
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#include <GLFW/glfw3.h>
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#include <iostream>
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// 三角形顶点
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float vertices[] = {
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// 第一个三角形
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0.5f, 0.5f, 0.0f, // 右上角
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0.5f, -0.5f, 0.0f, // 右下角
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-0.5f, -0.5f, 0.0f, // 左下角
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-0.5f, 0.5f, 0.0f // 左上角
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};
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// 索引
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unsigned int indices[] = {
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0, 1, 3, // 第一个三角形
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1, 2, 3 // 第二个三角形
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};
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// 顶点着色器源码
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const char *vertexShaderSource =
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"#version 330 core\n"
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"layout (location = 0) in vec3 aPos;\n"
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"void main()\n"
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"{\n"
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" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
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"}\0";
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// 片段着色器源码
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const char *fragmentShaderSource =
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"#version 330 core\n"
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"out vec4 FragColor;\n"
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"void main()\n"
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"{\n"
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" FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
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"}\n\0";
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void framebuffer_size_callback(GLFWwindow *window, int width, int height);
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void processInput(GLFWwindow *window);
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@ -42,14 +9,16 @@ void processInput(GLFWwindow *window);
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const unsigned int SCR_WIDTH = 800;
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const unsigned int SCR_HEIGHT = 600;
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int main() {
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int main(int argc, char **argv) {
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// 设置 glfw
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glfwInit();
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// 设置 OpenGL 版本为 3.3
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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// glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
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// 设置 OpenGL 管线为兼容模式
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
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// 创建窗口
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GLFWwindow *window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
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@ -69,87 +38,6 @@ int main() {
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// 设置视口
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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// 创建顶点着色器
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unsigned int vertexShader;
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vertexShader = glCreateShader(GL_VERTEX_SHADER);
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// 将着色器源码附加到着色器对象上
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glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
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// 编译着色器
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glCompileShader(vertexShader);
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// 检查编译是否成功
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int success;
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char infoLog[512];
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glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
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if (!success) {
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// 获取错误信息
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glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
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std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n"
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<< infoLog << std::endl;
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}
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// 创建片段着色器
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unsigned int fragmentShader;
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fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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// 将着色器源码附加到着色器对象上
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glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
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// 编译着色器
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glCompileShader(fragmentShader);
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// 检查编译是否成功
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glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
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if (!success) {
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// 获取错误信息
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glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
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std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n"
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<< infoLog << std::endl;
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}
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// 创建着色器程序
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unsigned int shaderProgram;
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shaderProgram = glCreateProgram();
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// 将着色器附加到程序上
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glAttachShader(shaderProgram, vertexShader);
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glAttachShader(shaderProgram, fragmentShader);
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// 链接程序
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glLinkProgram(shaderProgram);
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// 检查链接是否成功
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glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
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if (!success) {
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// 获取错误信息
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glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
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std::cout << "ERROR::SHADER::PROGRAM::LINK_FAILED\n"
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<< infoLog << std::endl;
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}
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// 删除着色器
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glDeleteShader(vertexShader);
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glDeleteShader(fragmentShader);
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// 创建顶点数组对象
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unsigned int VAO;
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glGenVertexArrays(1, &VAO);
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glBindVertexArray(VAO);
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// 创建顶点缓冲对象
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unsigned int VBO;
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glGenBuffers(1, &VBO);
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// 将顶点数据复制到缓冲中
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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// 创建索引缓冲对象
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unsigned int EBO;
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glGenBuffers(1, &EBO);
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// 将索引数据复制到缓冲中
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices,
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GL_STATIC_DRAW);
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// 设置顶点数据解析方式
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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// 循环渲染
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while (!glfwWindowShouldClose(window)) {
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// 处理输入
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@ -159,16 +47,48 @@ int main() {
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glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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// 绘制三角形, 激活程序
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glUseProgram(shaderProgram);
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glBindVertexArray(VAO);
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//使用线框模式绘制
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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// 设置线宽
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glLineWidth(5.0f);
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// 绘制
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
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glBindVertexArray(0);
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glLineWidth(3.0f);
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// 设置为 Gouraud 着色模式
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glShadeModel(GL_SMOOTH);
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// 绘制三角形
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glBegin(GL_TRIANGLES);
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glColor3f(1.0f, 0.0f, 0.0f); // 红色
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glVertex2f(-0.4f, -0.4f);
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glColor3f(0.0f, 1.0f, 0.0f); // 绿色
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glVertex2f(0.4f, -0.4f);
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glColor3f(0.0f, 0.0f, 1.0f); // 蓝色
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glVertex2f(-0.4f, 0.4f);
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glColor3f(0.0f, 1.0f, 0.0f); // 绿色
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glVertex2f(0.4f, -0.4f);
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glColor3f(0.0f, 0.0f, 1.0f); // 蓝色
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glVertex2f(-0.4f, 0.4f);
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glColor3f(0.0f, 0.0f, 0.0f); // 黑色
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glVertex2f(0.4f, 0.4f);
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glEnd();
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//使用面模式
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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// 设置为 FLAT 着色模式
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glShadeModel(GL_FLAT);
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glNewList(1, GL_COMPILE);
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glBegin(GL_TRIANGLE_FAN);
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glColor3f(0.0f, 0.0f, 1.0f); // 蓝色
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glVertex2f(0.5f, 0.5f);
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glVertex2f(0.5f, 0.7f);
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glVertex2f(0.7f, 0.5f);
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glVertex2f(0.5f, 0.7f);
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glVertex2f(0.7f, 0.5f);
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glVertex2f(0.7f, 0.7f);
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glEnd();
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glEndList();
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glCallList(1);
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// 检查并调用事件，交换缓冲
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glfwSwapBuffers(window);
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