在Windows 10上的VSCode中测试GLUT时收到错误消息

Question

Hello Stack溢出社区，

过去一周，我一直在努力解决这个问题，但没有成功。我搜寻了互联网来解决此问题，但无济于事。我正在尝试使用以下代码在C中创建一个简单的GLUT Open GL应用程序：

// This is a very basic Windows C application for testing GLUT (and compatible implementations such as freeglut).
#include <GL/glut.h>

/* Main method */
int main(int argc, char **argv)
{
  // Initialize GLUT functionality
  glutInit(&argc, argv);

  // Create a single window
  glutCreateWindow("GLUT Test");

  // Run the GLUT event loop
  glutMainLoop();

  return 0;
}

我已经跟随以下教程，一切都成功构建：

https://www.transmissionzero.co.uk/computing/using-glut-with-mingw/

不幸的是，在尝试运行该程序时，我始终收到以下错误消息：

freeglut (C:\users\jason\Google Drive\code\c\test\example.exe): fgPlatformInitialize: CreateDC failed, Screen size info may be incorrect
This is quite likely caused by a bad '-display' parameter

我已经尝试了很多方法来解决此问题，从尝试直接在fgPlatformInitialize中设置显示值到在Windows本身中设置DISPLAY环境变量以及许多其他解决方案。没有什么可以修复该错误消息。

作为参考，我正在使用Visual Studio Code，FreeGLUT和Windows10。是否应该将所有内容都安装在Arch Linux机器上？ ：）

请帮助并谢谢您！

Answer 1

对于其他遇到此问题的人，终于找到答案并回答了我自己的问题。

跟踪了一个名为OpenGL编程指南的优秀网站。

这是学习OpenGL的官方指南（尽管版本为1.1），但很棒的是，所有示例都专门用C语言编写。

URL：https://www.glprogramming.com/red/index.html

首先，您需要声明OpenGL和OpenGL实用程序库：

#include <GL/gl.h>
#include <GL/glut.h>

然后创建一个显示函数（可以命名为任何东西，但这是惯例）：

{
  glClear(GL_COLOR_BUFFER_BIT); // Clear all pixels from buffer

  glColor3f(1, 1, 1); // set the color palette to be white

  glBegin(GL_POLYGON);           // Create a polygonal object (a while box in this case)
  glVertex3f(0.25f, 0.25f, 0.0); // This means the polygon's "corners" as defined by these commands
  glVertex3f(0.75f, 0.25f, 0.0); // This means the polygon's "corners" as defined by these commands
  glVertex3f(0.75f, 0.75f, 0.0); // This means the polygon's "corners" as defined by these commands
  glVertex3f(0.25f, 0.75f, 0.0); // This means the polygon's "corners" as defined by these commands
  glEnd();

  glFlush(); // Start processing buffered OpenGL routines
}

然后创建一个初始化函数来连接OpenGL视图（再次可以命名为任何东西：]

void init(void)
{
  glClearColor(0.0, 0.0, 0.0, 0.0); // Set background color to black (last param is opacity, but doesn't seem to work)

  // Initialize viewing values
  glMatrixMode(GL_PROJECTION);            // Look this guy up
  glLoadIdentity();                       // Still have no idea what this means
  glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0); // Specifies the coordinate system OpenGL assumes as it draws the final image and how the image gets mapped to the screen
}

最后，只需在main c函数中调用所有必需的函数，瞧！

// Declare initial window size and display mode (single buffer and RGBA)
// Open window with "hello" in its title bar
// Call initialization routines
// Register callback function to display graphics
// Enter main loop and process events
int main(int argc, char **argv)
{
  glutInit(&argc, argv); // Initialize the GLUT OpenGL Utility Toolkit framework

  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); // Display mode which is RGB (Red Green Blue) type, single buffer as we're not switching screen buffers

  glutInitWindowSize(250, 250); // Declares window size in width and height

  glutCreateWindow("Hello"); // Set the name for the window box

  init(); // call the init function defined previously

  glutDisplayFunc(display); // call the glut display function, passing in your display function

  glutMainLoop(); // Enter main loop and process events

  return 0; // ANSI C standard requires main to return int
}

我希望对其他对此有帮助的人有所帮助！