包含glad.h时的分段错误

问题描述

我正在遵循 GLFW 入门指南，但我似乎无法让它与 GLAD 一起运行.

I am following the GLFW guide to getting started but I can't seem to make it run with GLAD.

这是我的 C 文件 (prac.c)

Here's my C file (prac.c)

#include <stdio.h>
#include <stdlib.h>
#include<glad/glad.h>
#include<GLFW/glfw3.h>

void error_callback(int error, const char* description) {
  fprintf(stderr, "Error %d: %s
", error, description);
}

int main(void) {
  GLFWwindow* window;

  if(!glfwInit()) return -1;

  glfwSetErrorCallback(error_callback);

  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
  window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
  if(!window) {
    glfwTerminate();
    return -1;
  }

  glfwMakeContextCurrent(window);

  printf("OpenGL version: %s
", glGetString(GL_VERSION));

  gladLoadGL();

  while(!glfwWindowShouldClose(window)) {
    glClear(GL_COLOR_BUFFER_BIT);

    glfwSwapBuffers(window);

    glfwPollEvents();
  }

  glfwDestroyWindow(window);
  glfwTerminate();
  return 0;
}

我通过运行这些命令的 Makefile 编译它:

And I compile it via a Makefile which runs these commands:

gcc -Wall -lglfw -lGL -ldl -Iglad/include -o obj/glad.o -c glad/src/glad.c
gcc -Wall -lglfw -lGL -ldl -Iglad/include -o obj/prac.o -c prac.c
gcc -Wall -lglfw -lGL -ldl -Iglad/include -o prac obj/glad.o obj/prac.o

每当我尝试运行可执行文件时，都会遇到分段错误.但是，当我注释掉 #include<glad/glad.h> 和 gladLoadGL(); 并构建它时，它会运行.这使我相信包含 glad.h 时会发生分段错误，但对于我来说，我无法弄清楚为什么.

Whenever I try to run the executable, I get a segmentation fault. However, when I comment out #include<glad/glad.h> and gladLoadGL(); and build it, it does run. This leads me to believe that the segmentation fault occurs when including glad.h, but for the life of me I can't figure out why.

推荐答案

你必须先调用initialize glad调用任何 OpenGL 指令.
这意味着 gladLoadGL() 必须在 glGetString(GL_VERSION) 之前完成:

You have to call initialize glad before calling any OpenGL instruction.
That means gladLoadGL() has to be done before glGetString(GL_VERSION):

glfwMakeContextCurrent(window);

gladLoadGL();

printf("OpenGL version: %s
", glGetString(GL_VERSION));

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