NuklearUI.cpp

Go to the documentation of this file.

 
 
#define NK_GLFW_GL4_IMPLEMENTATION
 
#include <entt/entity/registry.hpp>
 
#include "galaxy/core/Config.hpp"
#include "galaxy/core/ServiceLocator.hpp"
#include "galaxy/core/Window.hpp"
#include "galaxy/flags/Disabled.hpp"
#include "galaxy/fs/VirtualFileSystem.hpp"
#include "galaxy/utils/Globals.hpp"
 
#include "NuklearUI.hpp"
 
namespace galaxy
{
    namespace ui
    {
        NuklearUI::NuklearUI()
            : m_ctx {nullptr}
            , m_atlas {nullptr}
            , m_viewport_backup {0, 0, 0, 0}
        {
            auto& window = core::ServiceLocator<core::Window>::ref();
 
            m_ctx = nk_glfw3_init(window.handle(), NK_GLFW3_DEFAULT, NK_MAX_VERTEX_BUFFER, NK_MAX_ELEMENT_BUFFER);
 
            toggle_input(false);
            scale(window.get_content_scale_max());
        }
 
        NuklearUI::~NuklearUI()
        {
            nk_glfw3_shutdown();
            m_ctx   = nullptr;
            m_atlas = nullptr;
        }
 
        void NuklearUI::on_mouse_pressed(events::MousePressed& e)
        {
            if (!e.handled)
            {
                nk_glfw3_mouse_button_callback(nullptr, static_cast<int>(e.button), GLFW_PRESS, static_cast<int>(e.mod));
                e.handled = true;
            }
        }
 
        void NuklearUI::on_mouse_wheel(events::MouseWheel& e)
        {
            if (!e.handled)
            {
                nk_gflw3_scroll_callback(nullptr, e.xoff, e.yoff);
                e.handled = true;
            }
        }
 
        void NuklearUI::on_key_char(events::KeyChar& e)
        {
            if (!e.handled)
            {
                nk_glfw3_char_callback(nullptr, e.codepoint);
                e.handled = true;
            }
        }
 
        void NuklearUI::on_key_press(events::KeyPress& e)
        {
            if (!e.handled)
            {
                int action = GLFW_RELEASE;
 
                if (e.pressed == true)
                {
                    action = GLFW_PRESS;
                }
                else if (e.repeat == true)
                {
                    action = GLFW_REPEAT;
                }
 
                nk_glfw3_key_button_callback(nullptr, input::key_to_int(e.keycode), e.scancode, action, input::mod_to_int(e.mod));
                e.handled = true;
            }
        }
 
        void NuklearUI::on_content_scale(const events::ContentScale& e)
        {
            scale(std::max(e.xscale, e.yscale));
        }
 
        void NuklearUI::begin_input() const
        {
            if (glfw.do_input)
            {
                nk_input_begin(ctx());
            }
        }
 
        void NuklearUI::end_input() const
        {
            if (glfw.do_input)
            {
                for (auto i = 0; i < glfw.text_len; ++i)
                {
                    nk_input_unicode(&glfw.ctx, glfw.text[i]);
                }
 
                double x = 0.0, y = 0.0;
                glfwGetCursorPos(glfw.win, &x, &y);
                nk_input_motion(&glfw.ctx, static_cast<int>(x), static_cast<int>(y));
 
                nk_input_button(&glfw.ctx, NK_BUTTON_DOUBLE, static_cast<int>(glfw.double_click_pos.x), static_cast<int>(glfw.double_click_pos.y), glfw.is_double_click_down);
                nk_input_scroll(&glfw.ctx, glfw.scroll);
                nk_input_end(ctx());
                glfw.text_len = 0;
                glfw.scroll   = nk_vec2(0, 0);
            }
        }
 
        void NuklearUI::poll_input() const
        {
            begin_input();
            glfwPollEvents();
            end_input();
        }
 
        void NuklearUI::new_frame()
        {
            nk_glfw3_new_frame();
        }
 
        void NuklearUI::render()
        {
            glGetIntegerv(GL_VIEWPORT, m_viewport_backup.data());
 
            nk_glfw3_render(NK_ANTI_ALIASING_ON);
 
            glUseProgram(0);
            glBindVertexArray(0);
            glBindTexture(GL_TEXTURE_2D, 0);
            glDisable(GL_SCISSOR_TEST);
            glEnable(GL_DEPTH_TEST);
 
            glViewport(m_viewport_backup[0], m_viewport_backup[1], m_viewport_backup[2], m_viewport_backup[3]);
        }
 
        void NuklearUI::set_font(const std::string& id)
        {
            if (m_fonts.contains(id))
            {
                nk_style_set_font(ctx(), &m_fonts[id]->handle);
            }
        }
 
        void NuklearUI::toggle_input(const bool enable)
        {
            m_ctx->do_input = enable;
 
            if (!enable)
            {
                m_ctx->mod_held = false;
            }
        }
 
        void NuklearUI::show_loading_bar(const char* text, nk_size total, nk_size current)
        {
            auto& window = core::ServiceLocator<core::Window>::ref();
 
            if (nk_begin(
                    ctx(),
                    "loading_window",
                    nk_rect((window.get_widthf() / 2.0f) - 200, (window.get_heightf() / 2.0f) - 30, 400, 60),
                    NK_WINDOW_BORDER | NK_WINDOW_NO_SCROLLBAR
                ))
            {
                nk_layout_row_dynamic(ctx(), 20, 1);
                nk_label(ctx(), text, NK_TEXT_CENTERED);
                nk_layout_row_static(ctx(), 20, 400, 1);
                nk_progress(ctx(), &current, total, NK_FIXED);
            }
 
            nk_end(ctx());
        }
 
        void NuklearUI::show_building_atlas()
        {
            auto& window = core::ServiceLocator<core::Window>::ref();
 
            if (nk_begin(
                    ctx(),
                    "building_window",
                    nk_rect((window.get_widthf() / 2.0f) - 200, (window.get_heightf() / 2.0f) - 20, 400, 40),
                    NK_WINDOW_BORDER | NK_WINDOW_NO_SCROLLBAR
                ))
            {
                nk_layout_row_dynamic(ctx(), 20, 1);
                nk_label(ctx(), "Building Textures...", NK_TEXT_CENTERED);
            }
 
            nk_end(ctx());
        }
 
        nk_context* NuklearUI::ctx() const
        {
            return &m_ctx->ctx;
        }
 
        void NuklearUI::scale(const float scale)
        {
            auto& fs     = core::ServiceLocator<fs::VirtualFileSystem>::ref();
            auto& config = core::ServiceLocator<core::Config>::ref();
 
            if (m_atlas)
            {
                nk_font_atlas_clear(m_atlas);
            }
 
            nk_glfw3_font_stash_begin(&m_atlas);
 
            for (const auto& file : fs.list(GALAXY_UI_FONTS_DIR))
            {
                auto data = fs.read_binary(file);
                if (!data.empty())
                {
                    const auto size = scale * config.get<float>("ui_font_size");
 
                    auto font_cfg       = nk_font_config(size);
                    font_cfg.pixel_snap = true;
 
                    auto font = nk_font_atlas_add_from_memory(m_atlas, data.data(), data.size(), size, &font_cfg);
                    m_fonts.emplace(file, font);
                }
            }
 
            nk_glfw3_font_stash_end();
            nk_style_default(ctx());
        }
    } // namespace ui
} // namespace galaxy