使用着色器绘制多个对象（GLEW）

以下是使用GLEW库编写使用着色器绘制多个对象的代码示例：

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <iostream>

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);
    }
)";

const char* fragmentShaderSource = R"(
    #version 330 core
    out vec4 FragColor;
    uniform vec3 objectColor;
    void main()
    {
        FragColor = vec4(objectColor, 1.0);
    }
)";

float vertices1[] = {
    -0.5f, -0.5f, 0.0f,
    0.5f, -0.5f, 0.0f,
    0.0f,  0.5f, 0.0f
};

float vertices2[] = {
    0.0f, -0.5f, 0.0f,
    0.8f, -0.5f, 0.0f,
    0.4f,  0.5f, 0.0f
};

void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
    glViewport(0, 0, width, height);
}

void processInput(GLFWwindow* window)
{
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
}

int main()
{
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    GLFWwindow* window = glfwCreateWindow(800, 600, "Multiple Objects with Shaders (GLEW)", NULL, NULL);
    if (window == NULL)
    {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    if (glewInit() != GLEW_OK)
    {
        std::cout << "Failed to initialize GLEW" << std::endl;
        return -1;
    }

    GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
    glCompileShader(vertexShader);

    GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
    glCompileShader(fragmentShader);

    GLuint shaderProgram = glCreateProgram();
    glAttachShader(shaderProgram, vertexShader);
    glAttachShader(shaderProgram, fragmentShader);
    glLinkProgram(shaderProgram);

    glDeleteShader(vertexShader);
    glDeleteShader(fragmentShader);

    GLuint VAO1, VBO1;
    glGenVertexArrays(1, &VAO1);
    glGenBuffers(1, &VBO1);

    glBindVertexArray(VAO1);
    glBindBuffer(GL_ARRAY_BUFFER, VBO1);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices1), vertices1, GL_STATIC_DRAW);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);

    glBindVertexArray(0); // unbind VAO

    GLuint VAO2, VBO2;
    glGenVertexArrays(1, &VAO2);
    glGenBuffers(1, &VBO2);

    glBindVertexArray(VAO2);
    glBindBuffer(GL_ARRAY_BUFFER, VBO2);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices2), vertices2, GL_STATIC_DRAW);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);

    glBindVertexArray(0); // unbind VAO

    while (!glfwWindowShouldClose(window))
    {
        processInput(window);

        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        glUseProgram(shaderProgram);

        glUniform3f(glGetUniformLocation(shaderProgram, "objectColor"), 1.0f, 0.5f, 0.2f);
        glBindVertexArray(VAO1);
        glDrawArrays(GL_TRIANGLES, 0, 3);

        glUniform3f(glGetUniformLocation(shaderProgram, "object