python下学习opengl之简单窗口

Posted 2020-10-31 wndf6122

最近在看一个opengl教程：https://learnopengl.com/Introduction，写的深入浅出，非常不错，而且有中文的翻译版：https://learnopengl-cn.github.io/

出于加深学习效果，自己试着用Python重新实现原教程中的C++代码

1. 操作系统：Windows 10

2. 安装Python: https://www.python.org/downloads/, 我用的是3.6.3

3. 安装pyOpenGl： 安装完python后默认会同时安装pip, 将pip加入默认路径，在windows命令行窗口输入 pip install PyOpenGL

4. 下载GLFW：在http://www.glfw.org/download.html 下载 32-bit Windows binaries，下到的压缩文件解压后，得到库文件lib-vc2015/glfw3.dll

5. 下载GLFW的python 接口文件：在https://github.com/rougier/pyglfw 下载glfw.py，并将其和上一步得到的库文件放到python默认的库目录或当前开发代码的同级目录中

6. 创建window.py文件，代码如下：

#! /usr/bin/env python
# -*- coding: utf-8 -*-

import sys, os
import OpenGL.GL as gl
import glfw

WIN_WIDTH = 800
WIN_HEIGHT = 600

def framebuffer_size_callback(window, width, height):
    gl.glViewport(0, 0, width, height)

def processInput(window):
    if glfw.glfwGetKey(window, glfw.GLFW_KEY_ESCAPE) == glfw.GLFW_PRESS:
        glfw.glfwSetWindowShouldClose()

def main():
    glfw.glfwInit()
    glfw.glfwWindowHint(glfw.GLFW_CONTEXT_VERSION_MAJOR, 3)
    glfw.glfwWindowHint(glfw.GLFW_CONTEXT_VERSION_MINOR, 3)
    glfw.glfwWindowHint(glfw.GLFW_OPENGL_PROFILE, glfw.GLFW_OPENGL_CORE_PROFILE)

    window = glfw.glfwCreateWindow(WIN_WIDTH, WIN_HEIGHT, "学习OpenGL".encode(), 0, 0)
    if window == 0:
        print("failed to create window")
        glfw.glfwTerminate()

    glfw.glfwMakeContextCurrent(window)
    glfw.glfwSetFramebufferSizeCallback(window, framebuffer_size_callback)

    while not glfw.glfwWindowShouldClose(window):
        processInput(window)
        gl.glClearColor(0.2, 0.3, 0.3, 1.0)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)
        glfw.glfwSwapBuffers(window)
        glfw.glfwPollEvents()

glfw.glfwTerminate()

if __name__ == "__main__":
    main()

该段代码执行后得到的效果如下：

以上代码是对opengl教程中hello window章节的python实现，原来的C++代码见 https://learnopengl.com/Getting-started/Hello-Window