ImGuiLayer.cpp

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#include "eepch.h"
#include "ImGuiLayer.h"
 
#include "imgui.h"
#include "backends/imgui_impl_opengl3.h"
#include "backends/imgui_impl_glfw.h"
#include "backends/imgui_impl_opengl3.h"
#include "ImGuizmo.h"
 
#include "ElevateEngine/Core/Application.h"
 
#include "ElevateEngine/ImGui/ImGuiTheme.h"
#include <GLFW/glfw3.h>
 
Elevate::ImGuiLayer::ImGuiLayer()
    : Layer("ImGuiLayer") { }
 
Elevate::ImGuiLayer::~ImGuiLayer()
{
}
 
void Elevate::ImGuiLayer::OnAttach()
{
    // Setup Dear ImGui context
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO(); (void)io;
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;       // Enable Keyboard Controls
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;        // Enable Gamepad Controls
    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;           // Enable Docking
    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;         // Enable Multi-Viewport / Platform Windows
 
    //io.ConfigViewportsNoAutoMerge = true;
    //io.ConfigViewportsNoTaskBarIcon = true;
    UI::SetDarkTheme();
    
    // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
    ImGuiStyle& style = ImGui::GetStyle();
    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
    {
        style.WindowRounding = 0.0f;
        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
    }
 
    Application& app = Application::Get();
    GLFWwindow* window = static_cast<GLFWwindow*>(app.GetWindow().GetNativeWindow());
 
    // Setup Platform/Renderer bindings#
    ImGui_ImplGlfw_InitForOpenGL(window, true);
    ImGui_ImplOpenGL3_Init(EE_SHADER_VERSION_HEADER);
}   
 
void Elevate::ImGuiLayer::OnDetach()
{
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
}
 
void Elevate::ImGuiLayer::OnImGuiRender()
{
}
 
void Elevate::ImGuiLayer::PreRender()
{
    ImGui_ImplOpenGL3_NewFrame();
    ImGui_ImplGlfw_NewFrame();
}
 
void Elevate::ImGuiLayer::Begin()
{
    // ImGui
    ImGui::NewFrame();
    // ImGuizmo
    ImGuizmo::BeginFrame();
}
 
void Elevate::ImGuiLayer::Render()
{
    ImGui::Render();
}
 
void Elevate::ImGuiLayer::End()
{
    ImGuiIO& io = ImGui::GetIO();
    Application& app = Application::Get();
    io.DisplaySize = ImVec2((float)app.GetWindow().GetWidth(), (float)app.GetWindow().GetHeight());
 
    // Rendering
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
    {
        GLFWwindow* backup_current_context = glfwGetCurrentContext();
        ImGui::UpdatePlatformWindows();
        ImGui::RenderPlatformWindowsDefault();
        glfwMakeContextCurrent(backup_current_context);
    }
}
 
void Elevate::ImGuiLayer::Cleanup()
{
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
}