112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
#include "glad/glad.h"
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#include <GLFW/glfw3.h>
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#include <iostream>
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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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// settings
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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(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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// 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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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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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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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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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);
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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(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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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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}
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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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} |