GLFW三角形不会改变颜色

#include <GLFW/glfw3.h>
#include <OpenGL/gl3.h>

void render() {
    glClearColor(0.2f, 0.3f, 0.4f, 1.0f); // 设置清屏颜色
    glClear(GL_COLOR_BUFFER_BIT); // 清屏

    // 顶点着色器
    const char* vertexShaderSource = R"(
        #version 330 core
        layout (location = 0) in vec3 aPos;
        void main() {
            gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
        }
    )";

    // 片元着色器
    const char* fragmentShaderSource = R"(
        #version 330 core
        out vec4 FragColor;
        void main() {
            FragColor = vec4(1.0, 0.0, 0.0, 1.0); // 设置片元颜色为红色
        }
    )";

    // 创建顶点着色器对象
    GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
    glCompileShader(vertexShader);

    // 创建片元着色器对象
    GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
    glCompileShader(fragmentShader);

    // 创建着色器程序对象
    GLuint shaderProgram = glCreateProgram();
    glAttachShader(shaderProgram, vertexShader);
    glAttachShader(shaderProgram, fragmentShader);
    glLinkProgram(shaderProgram);

    // 使用着色器程序
    glUseProgram(shaderProgram);

    // 渲染三角形
    float vertices[] = {
        -0.5f, -0.5f, 0.0f,
        0.5f, -0.5f, 0.0f,
        0.0f, 0.5f, 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, 3 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindVertexArray(0);

    glBindVertexArray(VAO);
    glDrawArrays(GL_TRIANGLES, 0, 3);
    glBindVertexArray(0);
}

int main() {
    // 初始化GLFW
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    // 创建窗口
    GLFWwindow* window = glfwCreateWindow(800, 600, "Triangle", NULL, NULL);
    if (window == NULL) {
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);

    // 初始化GLEW
    if (glewInit() != GLEW_OK) {
        return -1;
    }

    // 渲染循环
    while (!glfwWindowShouldClose(window)) {
        render();
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    // 清理资源
    glfwTerminate();
    return 0;
}