214 lines
6.7 KiB
C++
214 lines
6.7 KiB
C++
#include "source.h"
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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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void mouse_callback(GLFWwindow *window, double xpos, double ypos);
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void scroll_callback(GLFWwindow *window, double xoffset, double yoffset);
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int main() {
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// 设置 glfw
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glfwInit();
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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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// 创建窗口
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GLFWwindow *window =
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glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
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if (window == NULL) {
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std::cout << "Failed to create GLFW window" << std::endl;
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glfwTerminate();
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return -1;
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}
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glfwMakeContextCurrent(window);
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// 加载glad
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
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std::cout << "Failed to initialize GLAD" << std::endl;
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return -1;
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}
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// 设置视口
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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// 创建着色器程序
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Shader shader = Shader("src/tex.vs", "src/tex.fs");
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unsigned int VAO, VBO, EBO;
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// 创建顶点数组对象
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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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glGenBuffers(1, &VBO);
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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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// 顶点属性
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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// 纹理坐标属性
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float),
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(void *)(3 * sizeof(float)));
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glEnableVertexAttribArray(1);
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// 创建纹理
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unsigned int texture1, texture2;
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glGenTextures(1, &texture1);
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glBindTexture(GL_TEXTURE_2D, texture1);
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// 设置纹理环绕方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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// 设置纹理过滤方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// 加载并生成纹理
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int width, height, nrChannels;
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// 图片翻转y轴
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stbi_set_flip_vertically_on_load(true);
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unsigned char *data =
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stbi_load("resources/container.jpg", &width, &height, &nrChannels, 0);
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if (data) {
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
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GL_UNSIGNED_BYTE, data);
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glGenerateMipmap(GL_TEXTURE_2D);
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} else {
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std::cout << "Failed to load texture" << std::endl;
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}
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stbi_image_free(data);
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glGenTextures(1, &texture2);
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glBindTexture(GL_TEXTURE_2D, texture2);
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// 设置纹理环绕方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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// 设置纹理过滤方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// 加载并生成纹理
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// 图片翻转y轴
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stbi_set_flip_vertically_on_load(true);
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data =
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stbi_load("resources/awesomeface.png", &width, &height, &nrChannels, 0);
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if (data) {
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// note that the awesomeface.png has transparency and thus an alpha channel,
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// so make sure to tell OpenGL the data type is of GL_RGBA
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
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GL_UNSIGNED_BYTE, data);
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glGenerateMipmap(GL_TEXTURE_2D);
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} else {
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std::cout << "Failed to load texture" << std::endl;
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}
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stbi_image_free(data);
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// 激活着色器
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shader.use();
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// 绑定纹理
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shader.setInt("texture1", 0);
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shader.setInt("texture2", 1);
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// create transformations
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glm::mat4 view =
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glm::lookAt(glm::vec3(0.0f, 0.0f, 3.0f), glm::vec3(0.0f, 0.0f, 0.0f),
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glm::vec3(0.0f, 1.0f, 0.0f));
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glm::mat4 projection = glm::mat4(1.0f);
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view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
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// 开启深度测试
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glEnable(GL_DEPTH_TEST);
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// 循环渲染
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while (!glfwWindowShouldClose(window)) {
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// 计算帧时间差
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// 处理输入
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processInput(window);
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// 设置为白色
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glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// 绑定纹理
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture1);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, texture2);
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// 绘制三角形
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shader.use();
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// 设置变换矩阵
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glm::mat4 trans(1.0f);
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trans = glm::rotate(trans, (float)glfwGetTime(), glm::vec3(0.0, 0.25, 0.0));
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shader.setMat4("trans", trans);
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glBindVertexArray(VAO);
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for (unsigned int i = 0; i < 10; i++) {
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glm::mat4 model(1.0f);
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model = glm::translate(model, cubePositions[i]);
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float angle = 20.0f * i + 50.0f;
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model =
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glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
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shader.setMat4("model", model);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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}
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float radius = 10.0f;
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view = camera.GetViewMatrix();
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shader.setMat4("view", view);
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projection = glm::perspective(
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glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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shader.setMat4("projection", projection);
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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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glfwPollEvents();
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}
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// 释放资源
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glfwTerminate();
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return 0;
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}
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// 处理输入
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void processInput(GLFWwindow *window) {
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if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
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glfwSetWindowShouldClose(window, true);
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
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camera.ProcessKeyboard(FORWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
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camera.ProcessKeyboard(BACKWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
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camera.ProcessKeyboard(LEFT, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
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camera.ProcessKeyboard(RIGHT, deltaTime);
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}
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// 窗口大小改变时回调该函数
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void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
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glViewport(0, 0, width, height);
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}
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void mouse_callback(GLFWwindow *window, double xpos, double ypos) {
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camera.ProcessMouseMovement(xpos, ypos);
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}
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void scroll_callback(GLFWwindow *window, double xoffset, double yoffset) {
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camera.ProcessMouseScroll(yoffset);
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} |