Question

在阅读OpenGL 4 Shading Language Cookbook时，我遇到了OpenGL Loader Gen库，并立即想尝试一下。我开始创建一个小的示例程序，您可以在下面看到它。

#include "GLFW/glfw3.h"
#include "GL/gl_core_4_1.hpp"

namespace engine
{
    class Window
    {
    private:
        const unsigned int width;

        const unsigned int height;

        const char *title;

        const void refresh()
        {
            glfwSwapBuffers(this -> glfwWindow);
            glfwPollEvents();
        }
    protected:
        GLFWwindow *glfwWindow;
    public:
        Window(const unsigned int width, const unsigned int height, const char title[]): width(width), height(height), title(title)
        {
            if (glfwInit() != GLFW_TRUE)
            {
                throw "Couldn't initialise the required GLFW library.";
            }
            glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
            glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
            glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
            glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
            if (this -> glfwWindow)
            {
                throw "Cannot create a secondary window.";
            }
            this -> glfwWindow = glfwCreateWindow(this -> width, this -> height, this -> title, NULL, NULL);
            // This is the crucial line that will stop the program from compiling.
            gl::exts::LoadTest context = gl::sys::LoadFunctions();
            if (!context)
            {
                throw "Couldn't initialse the required GL library.";
            }
            glfwMakeContextCurrent(this -> glfwWindow);
            glfwSwapInterval(GLFW_TRUE);
            if (!glfwWindow)
            {
                glfwTerminate();
                throw "Couldn't create a new initially empty window.";
            }
        }

        const bool await()
        {
            this -> refresh();
            if (glfwWindowShouldClose(this -> glfwWindow))
            {
                glfwDestroyWindow(this -> glfwWindow);
                glfwTerminate();
                return false;
            }
            return true;
        }
    };
}

int main(const int argc, const char *argv[])
{
    engine::Window window(1280, 720, "Foundation");
    while (window.await())
    {
    }
    return 0x00000000;
}

我的下一步是尝试在运行 macOS High Sierra 的计算机上使用LLVM编译器来编译程序。

clang ++ -o Application.exec子目录/*.cpp -lglfw -framework可可-framework OpenGL -framework IOKit -framework CoreVideo

但是，在编译过程中，我收到以下意外的链接器错误：

Undefined symbols for architecture x86_64:
  "gl::sys::LoadFunctions()", referenced from:
      engine::Window::Window(unsigned int, unsigned int, char const*) in Application-58a670.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

这是我的实际问题：我如何让上面显示的程序使用前面提到的OpenGL Loader Gen库编译？

Answer 1

来自the docs

上面的命令行将生成gl_core_3_3.h和gl_core_3_3.c文件。只需将它们包含在您的项目中即可；没有要构建的库，没有要解决的外部问题。

您需要运行其生成器来生成那些源文件。

尝试使用glLoadGen时出现链接错误

1 个答案: