136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
internal
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b8 init_imgui(GLFWwindow* window) {
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IMGUI_CHECKVERSION();
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ImGui::CreateContext();
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ImGuiIO& io = ImGui::GetIO(); (void) io;
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io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
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io.IniFilename = nullptr;
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io.LogFilename = nullptr;
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ImGui::StyleColorsDark();
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ImGui_ImplGlfw_InitForOpenGL(window, true);
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ImGui_ImplOpenGL3_Init("#version 400");
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return true;
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}
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internal
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void glfw_error_callback(i32 error, const char *description) {
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fprintf(stderr, "GLFW error %d: %s\n", error, description);
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}
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internal
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GLFWwindow *init_glfw(i32 desired_win_width, i32 desired_win_height)
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{
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glfwSetErrorCallback(glfw_error_callback);
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_TRUE);
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glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE);
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glfwWindowHint(GLFW_DECORATED, GLFW_TRUE);
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glfwWindowHint(GLFW_DEPTH_BITS, 32);
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#ifndef NDEBUG
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glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, true);
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#endif
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GLFWwindow *window = glfwCreateWindow(
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desired_win_width, desired_win_height,
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"RNTuple Viewer " V_MAJOR "." V_MINOR,
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nullptr,
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nullptr
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);
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glfwMakeContextCurrent(window);
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return window;
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}
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internal
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void monitor_key(GLFWwindow *window, u8 *key_state, i32 glfw_key, Input_Key key) {
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u8 &state = key_state[key];
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if (glfwGetKey(window, glfw_key) == GLFW_PRESS) {
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if (!(state & KEY_STATE_IS_DOWN)) state |= KEY_STATE_JUST_PRESSED;
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state |= KEY_STATE_IS_DOWN;
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} else if (glfwGetKey(window, glfw_key) == GLFW_RELEASE) {
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if (state & KEY_STATE_IS_DOWN) state |= KEY_STATE_JUST_RELEASED;
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state &= ~KEY_STATE_IS_DOWN;
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}
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}
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internal
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void run_main_loop(GLFWwindow *window, Arena *arena, App_State &app)
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{
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f32 delta_time_ms;
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chr::time_point last_saved_time = chr::high_resolution_clock::now();
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app.delta_time_accum.max = 100;
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app.delta_time_accum.base = arena_push_array<f32>(arena, app.delta_time_accum.max);
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while (!app.should_quit) {
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chr::time_point frame_start = chr::high_resolution_clock::now();
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u64 time_since_prev_frame_us = chr::duration_cast<chr::microseconds>(frame_start - last_saved_time).count();
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delta_time_ms = time_since_prev_frame_us * 0.001f;
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last_saved_time = frame_start;
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glfwPollEvents();
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// Update window size
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{
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Window_Data &wdata = app.win_data;
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i32 prev_width = wdata.width;
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i32 prev_height = wdata.height;
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glfwGetWindowSize(window, &wdata.width, &wdata.height);
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wdata.size_just_changed = prev_width != wdata.width || prev_height != wdata.height;
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}
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ImGui_ImplOpenGL3_NewFrame();
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ImGui_ImplGlfw_NewFrame();
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ImGui::NewFrame();
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// Check if the inspected file changed
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{
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char buf[sizeof(inotify_event) + NAME_MAX + 1];
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ssize_t nbytes = read(app.inspected_file.inot, buf, sizeof(buf));
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if (nbytes)
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app.inspected_file.size = file_size(app.inspected_file.stream);
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}
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if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS || glfwWindowShouldClose(window)) {
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app.should_quit = true;
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break;
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}
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b32 focused = glfwGetWindowAttrib(window, GLFW_FOCUSED);
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if (focused) {
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// Update keyboard
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u8 *key_state = app.user_input.key_state;
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monitor_key(window, key_state, GLFW_KEY_Q, KEY_Q);
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monitor_key(window, key_state, GLFW_KEY_UP, KEY_UP);
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monitor_key(window, key_state, GLFW_KEY_DOWN, KEY_DOWN);
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monitor_key(window, key_state, GLFW_KEY_LEFT, KEY_LEFT);
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monitor_key(window, key_state, GLFW_KEY_RIGHT, KEY_RIGHT);
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monitor_key(window, key_state, GLFW_KEY_LEFT_ALT, KEY_ALT);
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monitor_key(window, key_state, GLFW_KEY_TAB, KEY_TAB);
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// Update mouse
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f64 mposx, mposy;
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glfwGetCursorPos(window, &mposx, &mposy);
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app.user_input.mouse_pos.x = static_cast<i32>(mposx);
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app.user_input.mouse_pos.y = static_cast<i32>(mposy);
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}
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update_and_render(arena, app, delta_time_ms);
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ImGui::Render();
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ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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glfwSwapBuffers(window);
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}
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}
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