gui.cpp

/*
 * MIT License
 *
 * Copyright (c) 2024 Giovanni Santini
 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
 
#include "gui.hpp"
 
#include "gl_helper.hpp"
#include "screen.hpp"
#include "texture.hpp"
 
#ifdef USE_IMGUI
 
using namespace brenta;
using namespace brenta::types;
 
void gui::init()
{
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO &io = ImGui::GetIO();
    /* Enable Keyboard and Gamepad Controls */
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
 
    /* Setup Platform/Renderer backends */
    ImGui_ImplGlfw_InitForOpenGL(screen::get_window(), true);
    ImGui_ImplOpenGL3_Init();
    ImGui::SetNextWindowPos(ImVec2(0, 0));
}
 
void gui::destroy()
{
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
}
 
void gui::new_frame(framebuffer *fb)
{
    ImGui_ImplOpenGL3_NewFrame();
    ImGui_ImplGlfw_NewFrame();
    ImGui::NewFrame();
 
    ImGui::DockSpaceOverViewport(0, ImGui::GetMainViewport());
 
    // Game window ------------------------------------------
 
    ImGui::SetNextWindowSize(ImVec2(500, 500));
    ImGui::Begin("Game");
 
    float window_width = ImGui::GetContentRegionAvail().x;
    float window_height = ImGui::GetContentRegionAvail().y;
 
    fb->rescale(window_width, window_height);
    gl::set_viewport(0, 0, window_width, window_height);
 
    ImGui::Image((void *) (intptr_t) fb->texture_id,
                 ImGui::GetContentRegionAvail(), ImVec2(0, 1), ImVec2(1, 0));
 
    ImGui::End();
}
 
void gui::render()
{
    ImGui::Render();
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}
 
#endif