与 ImGui_ImplOpenGL3_CreateDeviceObjects 相关的 ImGui ERROR

Question

当我运行我的代码时，我收到了这个错误。 考虑到我仅在启用线程时才从 ImGui 收到此错误（运行时错误） 。

ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile vertex shader! With GLSL: #version 130

ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile fragment shader! With GLSL: #version 130

ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link shader program! With GLSL #version 130

这是我的代码。

gui.h

#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_opengl3.h"

#define GLEW_STATIC
#include <GL/glew.h>
#define GLFW_STATIC
#include <GLFW/glfw3.h>
#include "nfd.h"

#include <string>
#include <vector>
#include <thread>

#include "fileHandler.h"
#include "errors.h"

class MyGUI{
private:
  GLFWwindow *window;
  ImFont *tabFont, *ctntFonr, *logFont;
  ImGuiIO* io;

  bool isOpen = true;

  bool shouldRunFileOp = false;

  std::string m_OriginalFilePath, m_PartSizeMB, m_OutputFolderPath;

  void writeToFile(std::string _inputFile, unsigned long long _partByteSize, std::string _outputFolder){
    while(isOpen){
      if(shouldRunFileOp){

        // Do Some Large Files Related Stuff
        shouldRunFileOp = false;
      }
    }
  }

  void setCustomTheme(ImGuiStyle& _style){

    ImVec4 *colors = _style.Colors;

    colors[ImGuiCol_Tab] = ImVec4(0.4, 0.4, 0.4, 1.0);
    colors[ImGuiCol_TabHovered] = ImVec4(0.7, 0.3, 0.2, 1.0);
    colors[ImGuiCol_TabActive] = ImVec4(0.8, 0.3, 0.2, 1.0);
    colors[ImGuiCol_WindowBg] = ImVec4(0.1, 0.1, 0.1, 0.85);
    colors[ImGuiCol_TitleBgActive] = ImVec4(0.3, 0.3, 0.3, 1.0);
    colors[ImGuiCol_Text] = ImVec4(1.0, 1.0, 1.0, 1.0);

    _style.FrameRounding = 6;
    _style.WindowPadding = ImVec2(10, 10);
    _style.FramePadding = ImVec2(7.0, 4.0);
    _style.ItemSpacing = ImVec2(10.0, 20.0);
    _style.ItemInnerSpacing = ImVec2(2.0, 0.0);

  }

public:

  int init(){

    if (!glfwInit())
      return 1;

    // GL 3.0 + GLSL 130
    const char* glsl_version = "#version 130";
    glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, GL_TRUE);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);

    this->window = glfwCreateWindow(winSize.x, winSize.y, windowTitle.c_str(), NULL, NULL);
    if (window == NULL)
        return 1;

    glfwMakeContextCurrent(window);
    glfwSwapInterval(1); // Enable vsync

    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    this->io = &ImGui::GetIO(); (void)*(this->io);
    ImGui::StyleColorsDark();

    ImGuiStyle& style = ImGui::GetStyle();
    style.TabRounding = 4.0;
    style.WindowRounding = 5.0;
    style.WindowTitleAlign = ImVec2(0.5, 0.5);

    this->setCustomTheme(style);

    if(!ImGui_ImplGlfw_InitForOpenGL(window, true)) return 1;
    if(!ImGui_ImplOpenGL3_Init(glsl_version)) return 1;

    tabFont = io->Fonts->AddFontFromFileTTF("./assets/fonts/comic.ttf", 22.0f);
    ctntFont = io->Fonts->AddFontFromFileTTF("./assets/fonts/comic.ttf", 20.0f);
    logFont = io->Fonts->AddFontFromFileTTF("./assets/fonts/comic.ttf", 18.0f);
  }

  int run(){
    std::thread t1(&MyGUI::render, this);
    std::thread t2(&MyGUI::writeToFile, this, m_OriginalFilePath, m_PartSizeMB, m_OutputFolderPath);

    t1.join();
    t2.join();
  }

  int render(){
      while(!glfwWindowShouldClose(window)){

        glfwPollEvents();

        ImGui_ImplOpenGL3_NewFrame(); // Error is Getting from this Line.
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();

        {
          ImGui::Begin("File Window");
            // Another GUI Elements
            if(ImGui::Button("Proceed")){
              shouldRunFileOp = true;
            }
          ImGui::End();
        }

        ImGui::Render();
        int display_w, display_h;
        glfwGetFramebufferSize(this->window, &display_w, &display_h);
        glViewport(0, 0, display_w, display_h);
        glClearColor(0.2, 0.2, 0.2, 1.0);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
    
        glfwSwapBuffers(this->window);

      }

      isOpen = false;

      ImGui_ImplOpenGL3_Shutdown();
      ImGui_ImplGlfw_Shutdown();
      ImGui::DestroyContext();

      glfwDestroyWindow(this->window);
      glfwTerminate();

      return 0;
  }
};

主文件

#include "gui.h"

int main(){

  MyGUI gui;
  gui.init();
  gui.run();

  return 0;
}

我已经检查过，错误来自gui.h中的这一行，

ImGui_ImplOpenGL3_NewFrame();

我的代码有什么问题？ 顺便说一句，此代码在不定义线程时工作正常

我必须使用线程，因为我的程序正在处理大型文件。

如果有人也知道如何在不中断渲染循环的情况下处理大型文件，也请放弃您的解决方案！

谢谢你！

Answer 1

OpenGL 上下文是线程本地的，需要在线程（ glfwMakeContextCurrent(window ) 中设置为“当前”。上下文不能同时在多个线程中为“当前”。您必须使 OpenGL 上下文在render线程：

int render(){

    glfwMakeContextCurrent(window);   // <---

    while(!glfwWindowShouldClose(window)){
        // [...]  
    }
    // [...]
}