353 lines
11 KiB
C++
353 lines
11 KiB
C++
/*
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* Created by Brett on 28/11/23.
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* Licensed under GNU General Public License V3.0
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* See LICENSE file for license detail
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*/
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#include <blt/gfx/window.h>
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#include <blt/std/assert.h>
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#include <blt/std/logging.h>
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#include <blt/std/time.h>
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#include <blt/gfx/input.h>
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#include <queue>
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#include <imgui.h>
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#include "backends/imgui_impl_opengl3.h"
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#include "backends/imgui_impl_glfw.h"
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#include <blt/gfx/imgui/ImGuiUtils.h>
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void error_callback(int error, const char* description)
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{
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BLT_ERROR("GLFW Error (%d): %s", error, description);
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std::abort();
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}
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namespace blt::gfx
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{
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struct
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{
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/* GLFW Window Object */
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GLFWwindow* window = nullptr;
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/* BLT internal input state manager, handles keyboard/mouse allocations + states */
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input_manager inputManager;
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/* stores any drag and dropped paths for processing */
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std::queue<std::string> pendingPaths;
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/* current width and height of the window */
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std::int32_t width = 0;
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std::int32_t height = 0;
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/* Frame time information (last frame) */
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std::int64_t lastTime = blt::system::nanoTime();
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std::int64_t deltaTime = 0;
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double nanoDelta = 0;
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double millisDelta = 0;
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} window_state;
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void create_callbacks()
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{
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/* Setup keyboard callback */
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glfwSetKeyCallback(window_state.window, [](GLFWwindow*, int key, int, int action, int) {
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if (key < 0 || key == GLFW_KEY_UNKNOWN)
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return;
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KEY_STATE state;
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switch (action)
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{
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case GLFW_PRESS:
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state = KEY_STATE::PRESS;
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break;
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case GLFW_REPEAT:
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state = KEY_STATE::REPEAT;
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break;
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default:
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state = KEY_STATE::RELEASE;
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}
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window_state.inputManager.key(key) = state;
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window_state.inputManager.key_pressed = true;
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});
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/* Setup mouse button callback */
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glfwSetMouseButtonCallback(window_state.window, [](GLFWwindow*, int button, int action, int) {
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if (button < 0)
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return;
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MOUSE_STATE state;
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switch (action)
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{
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case GLFW_PRESS:
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state = MOUSE_STATE::PRESS;
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break;
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default:
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state = MOUSE_STATE::RELEASE;
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break;
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}
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window_state.inputManager.mouse(button) = state;
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window_state.inputManager.mouse_pressed = true;
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});
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/* Setup mouse cursor callback */
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glfwSetCursorPosCallback(window_state.window, [](GLFWwindow*, double x, double y) {
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window_state.inputManager.updateMousePos(x, y);
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window_state.inputManager.mouse_moved = true;
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});
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/* Setup mouse scroll callback */
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glfwSetScrollCallback(window_state.window, [](GLFWwindow*, double, double s) {
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window_state.inputManager.updateScroll(s);
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});
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/* Setup drop input callback */
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glfwSetDropCallback(window_state.window, [](GLFWwindow*, int count, const char** paths) {
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for (int i = 0; i < count; i++)
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window_state.pendingPaths.emplace(paths[i]);
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});
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}
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void setup_ImGUI()
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{
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const char* glsl_version = "#version 100";
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// Setup Dear ImGui context
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IMGUI_CHECKVERSION();
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ImGui::CreateContext();
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ImGuiIO& io = ImGui::GetIO();
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io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
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io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
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// Setup Dear ImGui style
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ImGui::StyleColorsDark();
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//ImGui::Spectrum::StyleColorsSpectrum();
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ImGui::Spectrum::LoadFont();
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ImGui::SetupImGuiStyle(true, 1.0);
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// Setup FA
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ImFontConfig config;
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config.MergeMode = true;
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config.GlyphMinAdvanceX = 13.0f; // Use if you want to make the icon monospaced
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static const ImWchar icon_ranges[] = {ICON_MIN_FA, ICON_MAX_FA, 0};
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io.Fonts->AddFontFromMemoryCompressedBase85TTF(fontAwesomeRegular_compressed_data_base85, 13.0f, &config, icon_ranges);
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io.Fonts->AddFontFromMemoryCompressedTTF(fontAwesomeSolid_compressed_data, static_cast<int>(fontAwesomeSolid_compressed_size), 13.0, &config,
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icon_ranges);
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io.Fonts->AddFontFromMemoryCompressedTTF(fontAwesomeBrands_compressed_data, static_cast<int>(fontAwesomeBrands_compressed_size), 13.0, &config,
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icon_ranges);
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//ImGui::StyleColorsLight();
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// Setup Platform/Renderer backends
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ImGui_ImplGlfw_InitForOpenGL(window_state.window, true);
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#ifdef __EMSCRIPTEN__
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ImGui_ImplGlfw_InstallEmscriptenCanvasResizeCallback("#canvas");
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#endif
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ImGui_ImplOpenGL3_Init(glsl_version);
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#ifdef __EMSCRIPTEN__
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io.IniFilename = nullptr;
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#endif
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}
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void loop(void* arg)
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{
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const auto& data = *((window_data*) arg);
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/* -- Get the current framebuffer size, update the global width/height state, along with OpenGL viewport -- */
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glfwGetFramebufferSize(window_state.window, &window_state.width, &window_state.height);
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glViewport(0, 0, window_state.width, window_state.height);
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// TODO: user option for this
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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/* -- Begin the next ImGUI frame -- */
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ImGui_ImplOpenGL3_NewFrame();
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ImGui_ImplGlfw_NewFrame();
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ImGui::NewFrame();
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/* -- Call user update function -- */
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data.update(data.context, window_state.width, window_state.height);
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/* -- Render the ImGUI frame -- */
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ImGui::Render();
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ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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/* -- Update GLFW state -- */
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window_state.inputManager.clear();
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glfwSwapBuffers(window_state.window);
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glfwPollEvents();
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/* -- Update Frame Timing Information -- */
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auto current_time = blt::system::nanoTime();
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window_state.deltaTime = current_time - window_state.lastTime;
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window_state.lastTime = current_time;
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window_state.nanoDelta = static_cast<double>(window_state.deltaTime) / 1e9f;
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window_state.millisDelta = static_cast<double>(window_state.deltaTime) / 1e6f;
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}
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void init(const window_data& data)
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{
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/* -- Set up Error Callback -- */
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glfwSetErrorCallback(error_callback);
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BLT_ASSERT(glfwInit() && "Unable to init GLFW. Aborting.");
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/* -- Set up Window Context -- */
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, data.context.GL_MAJOR);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, data.context.GL_MINOR);
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glfwWindowHint(GLFW_DOUBLEBUFFER, data.context.DOUBLE_BUFFER);
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glfwWindowHint(GLFW_OPENGL_PROFILE, data.context.GL_PROFILE);
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glfwWindowHint(GLFW_SAMPLES, data.context.SAMPLES);
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/* -- Create the Window -- */
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window_state.window = glfwCreateWindow(data.width, data.height, data.title.c_str(), nullptr, nullptr);
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BLT_ASSERT(window_state.window && "Unable to create GLFW window.");
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/* -- Set Window Specifics + OpenGL -- */
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glfwMakeContextCurrent(window_state.window);
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glfwSwapInterval(data.sync_interval);
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#ifndef __EMSCRIPTEN__
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gladLoadGL(glfwGetProcAddress);
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#endif
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/* -- Set up our local callbacks, ImGUI will then call these -- */
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create_callbacks();
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/* -- Set up ImGUI -- */
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setup_ImGUI();
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if (data.context.SAMPLES > 0)
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glEnable(GL_MULTISAMPLE);
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/* -- Call User Provided post-window-init function -- */
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data.init(data.context);
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#ifdef __EMSCRIPTEN__
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/*
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* "setting 0 or a negative value as the fps will use the browser’s requestAnimationFrame mechanism to call the main loop function.
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* This is HIGHLY recommended if you are doing rendering, as the browser’s requestAnimationFrame will
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* make sure you render at a proper smooth rate that lines up properly with the browser and monitor."
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* https://emscripten.org/docs/api_reference/emscripten.h.html
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*/
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emscripten_set_main_loop_arg(loop, (void*)&data, 0, true);
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#else
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/* -- General Loop -- */
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while (!glfwWindowShouldClose(window_state.window))
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loop((void*) &data);
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#endif
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}
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void cleanup()
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{
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ImGui_ImplOpenGL3_Shutdown();
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ImGui_ImplGlfw_Shutdown();
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ImGui::DestroyContext();
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glfwDestroyWindow(window_state.window);
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glfwTerminate();
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}
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double getMouseX()
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{
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return window_state.inputManager.mouseX;
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}
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double getMouseY()
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{
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return window_state.inputManager.mouseY;
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}
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double getMouseDX()
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{
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return window_state.inputManager.deltaX;
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}
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double getMouseDY()
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{
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return window_state.inputManager.deltaY;
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}
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void lockCursor()
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{
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glfwSetInputMode(window_state.window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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}
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void unlockCursor()
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{
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glfwSetInputMode(window_state.window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
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}
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bool isCursorLocked()
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{
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return glfwGetInputMode(window_state.window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED;
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}
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bool isCursorInWindow()
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{
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#ifdef __EMSCRIPTEN__
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// TODO:
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return true;
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#else
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return glfwGetWindowAttrib(window_state.window, GLFW_HOVERED);
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#endif
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}
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void setRawInput(bool state)
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{
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#ifdef __EMSCRIPTEN__
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// TODO?
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#else
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if (glfwRawMouseMotionSupported())
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glfwSetInputMode(window_state.window, GLFW_RAW_MOUSE_MOTION, state ? GLFW_TRUE : GLFW_FALSE);
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#endif
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}
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bool isRawInput()
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{
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#ifdef __EMSCRIPTEN__
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return false;
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#else
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return glfwGetInputMode(window_state.window, GLFW_RAW_MOUSE_MOTION);
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#endif
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}
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void setClipboard(const std::string& str)
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{
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glfwSetClipboardString(window_state.window, str.c_str());
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}
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std::string getClipboard()
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{
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return glfwGetClipboardString(window_state.window);
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}
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bool isMousePressed(int button)
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{
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return window_state.inputManager.isMousePressed(button);
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}
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bool isKeyPressed(int key)
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{
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return window_state.inputManager.isKeyPressed(key);
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}
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double getFrameDeltaSeconds()
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{
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return window_state.nanoDelta;
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}
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double getFrameDeltaMilliseconds()
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{
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return window_state.millisDelta;
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}
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std::int64_t getFrameDelta()
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{
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return window_state.deltaTime;
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}
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bool mouseMovedLastFrame()
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{
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return window_state.inputManager.mouse_moved;
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}
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bool mousePressedLastFrame()
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{
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return window_state.inputManager.mouse_pressed;
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}
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bool keyPressedLastFrame()
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{
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return window_state.inputManager.key_pressed;
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}
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}
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