ImGuiLayer.cc

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#include "ImGuiLayer.hh"
 
#include "ImGuiManager.hh"
 
#include <imgui.h>
#include <imgui_impl_sdl2.h>
#include <imgui_impl_opengl3.h>
 
#include <SDL.h>
 
namespace openmsx {
 
ImGuiLayer::ImGuiLayer(ImGuiManager& manager_)
        : Layer(Layer::Coverage::PARTIAL, Layer::ZIndex::IMGUI)
        , manager(manager_)
{
}
 
void ImGuiLayer::paint(OutputSurface& /*surface*/)
{
        manager.preNewFrame();
 
        // Start the Dear ImGui frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplSDL2_NewFrame();
        ImGui::NewFrame();
 
        manager.paintImGui();
 
        // Allow docking in main window
        ImGui::DockSpaceOverViewport(ImGui::GetMainViewport(),
                ImGuiDockNodeFlags_NoDockingOverCentralNode |
                ImGuiDockNodeFlags_PassthruCentralNode);
 
        if (first) {
                // on startup, focus main openMSX window instead of the GUI window
                first = false;
                ImGui::SetWindowFocus(nullptr);
        }
 
        // Rendering
        const ImGuiIO& io = ImGui::GetIO();
        ImGui::Render();
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 
        // Update and Render additional Platform Windows
        // (Platform functions may change the current OpenGL context, so we
        // save/restore it to make it easier to paste this code elsewhere.
        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) {
                SDL_Window* backup_current_window = SDL_GL_GetCurrentWindow();
                SDL_GLContext backup_current_context = SDL_GL_GetCurrentContext();
                ImGui::UpdatePlatformWindows();
                ImGui::RenderPlatformWindowsDefault();
                SDL_GL_MakeCurrent(backup_current_window, backup_current_context);
        }
}
 
} // namespace openmsx