c - GCC 编译器给了我关于 true 未定义等错误

Question

我想用 OpenGL 制作一个游戏，到目前为止它给了我这些错误。这没有多大意义，因为我遵循了一个教程（这是一个 C++ 教程，但几乎相同）

这是我的代码：

#include <stdio.h>
#include <stdlib.h>
#include <GL/glew.h>
#include <GL/glfw3.h>

int main(){
   glewExperimental = true;
   if(!glfwInit()){
    printf("failed to initialize GLFW\n");
    return -1;
   }
   glfwWindowHint(GLFW_SAMPLES, 4);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
   glfwWindowHint(GLFW_CONTENT_VERSION_MINOR, 3);
   glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

   GLFWwindow* window;
   window = glfwCreateWindow(1024, 768, "Game", NULL, NULL);
   if(window == NULL){
    printf("Sorry to say this, but your OpenGL version must be 3.3 or above! Thanks for playing, but to continue you must update your video card drivers or if you use an old GPU you may have to replace it with a new one to play this game. I will be developing my game for OpenGL 1 and 2 soon so stay on touch.");
    glfwTerminate();
    return -1;
   }
   glfwMakeContentCurrent(window);
   glewExperimental = true;
   if(glewInit() != GLEW_OK){
    printf("Failed to initilize GLEW");
    return -1;
   }

}

这些是错误：

main.c: In function ‘main’:
main.c:7:23: error: ‘true’ undeclared (first use in this function)
    7 |    glewExperimental = true;
      |                       ^~~~
main.c:7:23: note: each undeclared identifier is reported only once for each function it appears in
main.c:14:19: error: ‘GLFW_CONTENT_VERSION_MINOR’ undeclared (first use in this function); did you mean ‘GLFW_CONTEXT_VERSION_MINOR’?
   14 |    glfwWindowHint(GLFW_CONTENT_VERSION_MINOR, 3);
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                   GLFW_CONTEXT_VERSION_MINOR
main.c:25:4: warning: implicit declaration of function ‘glfwMakeContentCurrent’; did you mean ‘glfwMakeContextCurrent’? [-Wimplicit-function-declaration]
   25 |    glfwMakeContentCurrent(window);
      |    ^~~~~~~~~~~~~~~~~~~~~~
      |    glfwMakeContextCurrent

编辑：事实证明我有一个错字。它必须是 GLFW_CONTEXT_VERSION_MINOR 而不是 GLFW_CONTENT_VERSION_MINOR

标签： cgccglfwglew

Answer 1

如果编译为 C，您必须#include <stdbool.h>访问true,false和bool. 它们只是 C++ 中的关键字，而不是 C 中的关键字。