axmol/extensions/ImGui

The ImGui extension for axmol

Sync from https://github.com/Xrysnow/cocos2d-x-imgui and do a little changes

Improvements

• Simplify API, use add/remove renderLoop present ImGui GUI widgets
• Optimize call pipeline flow, support add/remove Node to Scene at ImGui render loop without container iterator damage
• Calculate deltaTime at ImGui_ImplCocos2dx_NewFrame to avoid error when cc.Director paused
• Refine Init/Shutdown, Restore all callbacks for glfw to solve recreate ImGuiPresenter instance support
• Use FOURCC for key of ImGui render loop
• Add dpi scale support, use ImGuiPresenter::getInstance()->enableDPIScale();
• Easy font manager, stable API addFont,removeFont,clearFonts to manage ImGui fonts, with ImGui API, very hard to do correctly.

How to use

#include "ImGui/ImGuiPresenter.h"
USING_NS_AX;
USING_NS_AX_EXT;

class GameScene : public Scene {
public:
    void onEnter() override
    {
        Scene::onEnter();
        ImGuiPresenter::getInstance()->addFont(R"(C:\Windows\Fonts\msyh.ttc)");
        /* For Simplified Chinese support, please use:
        ImGuiPresenter::getInstance()->addFont(R"(C:\Windows\Fonts\msyh.ttc)", ImGuiPresenter::DEFAULT_FONT_SIZE,
                                           ImGuiPresenter::CHS_GLYPH_RANGE::GENERAL);
        */
        ImGuiPresenter::getInstance()->enableDPIScale(); // enable dpi scale for 4K display support, depends at least one valid ttf/ttc font was added.
        ImGuiPresenter::getInstance()->addRenderLoop("#im01", AX_CALLBACK_0(GameScene::onImGuiDraw, this), this);
    }
    void onExit() override
    {
        Scene::onExit();
        ImGuiPresenter::getInstance()->removeRenderLoop("#im01");
    }
    void onImGuiDraw()
    {
        ImGui::Begin("window");
        ImGui::Text("FPS=%.1f", 1.f / ImGui::GetIO().DeltaTime);
        ImGui::End();
    }
}

More about use imgui widgets, please see: https://github.com/ocornut/imgui

Tested devices

• win32
• macOS

Known issues

• Can't enable muti-viewports on macOS, so we disable this feature for macOS.

Other resources of ImGui

• https://github.com/ocornut/imgui/wiki/Bindings
• https://github.com/CedricGuillemet/ImGuizmo