ImGui错误:断言失败：(bd != __null &“您调用ImGui_ImplOpenGL3_Init()了吗？”)

Question

我已经和SDL2一起工作很长时间了，现在我想和亲爱的ImGui切换到GLFW。所以我下载了GLFW并将它集成到项目中。简单的GLFW窗口工作没有问题。然后，我集成了ImGui，并一直得到这些错误：

Failed to initialize OpenGL loader!
Assertion failed: (bd != __null && "Did you call ImGui_ImplOpenGL3_Init()?"), function ImGui_ImplOpenGL3_NewFrame, file imgui_impl_opengl3.cpp, line 337.

虽然我在33线上：

ImGui_ImplOpenGL3_Init();

我以前从未和ImGui合作过，如果你能帮我的话，我会很高兴的。

我的代码：

int main() {
    //init glfw
    if (!glfwInit()) {
        std::cout << "Failed to initialize GLFW" << std::endl;
        return -1;
    }
    //create window
    GLFWwindow* window = glfwCreateWindow(640, 480, "Text Editor", NULL, NULL);
    if (!window) {
        std::cout << "Failed to create window" << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    //init glew
    if (glewInit() != GLEW_OK) {
        std::cout << "Failed to initialize GLEW" << std::endl;
        return -1;
    }
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO(); (void)io;
    ImGui_ImplGlfw_InitForOpenGL(window, true);
    ImGui::StyleColorsDark();
    ImGui_ImplOpenGL3_Init();

    //main loop
    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();


        ImGui::Render();
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
        glfwSwapBuffers(window);
        glfwPollEvents();
    }
    return 0;
}

我的内容包括：

#include "GL/glew.h"
#include "GLFW/glfw3.h"
#include "imgui/imgui.h"
#include "imgui/imgui_impl_glfw.h"
#include "imgui/imgui_impl_opengl3.h"

谢谢你的回答:)

Answer 1

您的代码在我的机器上运行良好，它不是在ImGui_ImplOpenGL3_NewFrame函数上崩溃，而是在ImGui::Render();上崩溃，这可能是问题所在。您需要按以下顺序呈现：

while (!glfwWindowShouldClose(window))
{
    glfwPollEvents();
    ImGui_ImplOpenGL3_NewFrame();
    ImGui_ImplGlfw_NewFrame();

    ImGui::NewFrame(); // <-- Added

    // do stuffs here

    ImGui::Render();
    ImGui::EndFrame(); // <-- Added

    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
    glfwSwapBuffers(window);
    glfwPollEvents();
}