int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
{
printf("Error: %s\n", SDL_GetError());
return -1;
}
// Setup window
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_DisplayMode current;
SDL_GetCurrentDisplayMode(0, ¤t);
SDL_Window *window = SDL_CreateWindow("ImGui SDL2+OpenGL example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
SDL_GLContext glcontext = SDL_GL_CreateContext(window);
SDL_GL_SetSwapInterval(1); // Enable vsync
// Setup ImGui binding
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO(); (void)io;
ImGui_ImplSdlGL2_Init(window);
//io.NavFlags |= ImGuiNavFlags_EnableKeyboard; // Enable Keyboard Controls
// Setup style
ImGui::StyleColorsDark();
//ImGui::StyleColorsClassic();
// Load Fonts
// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
// - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
// - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
// - Read 'misc/fonts/README.txt' for more instructions and details.
// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
//io.Fonts->AddFontDefault();
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
//IM_ASSERT(font != NULL);
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// Main loop
bool done = false;
while (!done)
{
// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
SDL_Event event;
while (SDL_PollEvent(&event))
{
ImGui_ImplSdlGL2_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
}
ImGui_ImplSdlGL2_NewFrame(window);
// 1. Show a simple window.
// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
{
static float f = 0.0f;
static int counter = 0;
ImGui::Text("Hello, world!"); // Display some text (you can use a format string too)
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our windows open/close state
ImGui::Checkbox("Another Window", &show_another_window);
if (ImGui::Button("Button")) // Buttons return true when clicked (NB: most widgets return true when edited/activated)
counter++;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window);
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui!
if (show_demo_window)
{
ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
ImGui::ShowDemoWindow(&show_demo_window);
}
// Rendering
glViewport(0, 0, (int)ImGui::GetIO().DisplaySize.x, (int)ImGui::GetIO().DisplaySize.y);
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
ImGui::Render();
ImGui_ImplSdlGL2_RenderDrawData(ImGui::GetDrawData());
SDL_GL_SwapWindow(window);
}
// Cleanup
ImGui_ImplSdlGL2_Shutdown();
ImGui::DestroyContext();
SDL_GL_DeleteContext(glcontext);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
void mainLoop() {
ImGuiIO& io = ImGui::GetIO();
SDL_Event sdl_event;
while (SDL_PollEvent(&sdl_event)) {
ImGui_ImplSdlGL2_ProcessEvent(&sdl_event);
switch (sdl_event.type) {
case SDL_WINDOWEVENT:
switch (sdl_event.window.event) {
case SDL_WINDOWEVENT_SIZE_CHANGED: {
#ifdef _WIN32
app->video.width = sdl_event.window.data1 / app->video.pixel_scale;
app->video.height = sdl_event.window.data2 / app->video.pixel_scale;
#else
app->video.width = sdl_event.window.data1;
app->video.height = sdl_event.window.data2;
#endif
// update opengl viewport
int drawable_width, drawable_height;
SDL_GL_GetDrawableSize(sdl_window, &drawable_width, &drawable_height);
glViewport(0, 0, drawable_width, drawable_height);
break;
}
}
break;
case SDL_MOUSEMOTION:
mouse_timer = 0;
break;
case SDL_QUIT:
app->quit = true;
break;
case SDL_KEYDOWN: {
if (!io.WantCaptureKeyboard) {
if (sdl_event.key.keysym.sym == SDLK_SPACE) {
app->toggleAnimation();
}
}
// handle hotkeys
bool ctrl_key_down = io.OSXBehaviors ? io.KeySuper : io.KeyCtrl;
bool shift_key_down = io.KeyShift;
if (ctrl_key_down) {
switch (sdl_event.key.keysym.sym) {
case SDLK_1: case SDLK_2: case SDLK_3: case SDLK_4:
app->toggleWindow(sdl_event.key.keysym.sym-SDLK_1);
break;
case SDLK_b: // build / compile
app->recompileShader();
break;
case SDLK_f: // fullscreen
windowToggleFullscreen();
break;
case SDLK_h: // hide gui
if (!io.OSXBehaviors || shift_key_down) app->hide_gui = !app->hide_gui; // toggle imgui
break;
case SDLK_n: // new
app->newShader();
break;
case SDLK_o: // open
app->openShaderDialog();
break;
case SDLK_q: // quit
app->quit = true;
break;
case SDLK_s: // save
if (shift_key_down) app->saveShaderDialog();
else app->saveShader();
break;
default: break;
}
}
if (sdl_event.key.keysym.sym == SDLK_F11) {
windowToggleFullscreen();
}
break;
}
}
}
// TODO: make use of mouse_timer
// doesn't seam to work on OS X?
SDL_ShowCursor(app->hide_gui ? SDL_DISABLE : SDL_ENABLE);
// TODO: better keyboard handling
// update input commands
// TODO: move this to some function
// this also depends on the game state
// when do we want a movement command?
const Uint8 *key_state = SDL_GetKeyboardState(NULL);
app->movement_command.move = v3(
- (key_state[SDL_SCANCODE_A] == SDL_PRESSED ? 1.0f : 0.0f)
+ (key_state[SDL_SCANCODE_D] == SDL_PRESSED ? 1.0f : 0.0f),
- (key_state[SDL_SCANCODE_Q] == SDL_PRESSED ? 1.0f : 0.0f)
+ (key_state[SDL_SCANCODE_E] == SDL_PRESSED ? 1.0f : 0.0f),
- (key_state[SDL_SCANCODE_W] == SDL_PRESSED ? 1.0f : 0.0f)
+ (key_state[SDL_SCANCODE_S] == SDL_PRESSED ? 1.0f : 0.0f));
app->movement_command.rotate = v2(
- (key_state[SDL_SCANCODE_UP ] == SDL_PRESSED ? 1.0f : 0.0f)
+ (key_state[SDL_SCANCODE_DOWN ] == SDL_PRESSED ? 1.0f : 0.0f),
- (key_state[SDL_SCANCODE_LEFT ] == SDL_PRESSED ? 1.0f : 0.0f)
+ (key_state[SDL_SCANCODE_RIGHT] == SDL_PRESSED ? 1.0f : 0.0f));
if (!app->hide_gui && io.WantCaptureKeyboard) { // null movement
app->movement_command.move = v3(0.0f);
app->movement_command.rotate = v2(0.0f);
}
ImGui_ImplSdlGL2_NewFrame();
app->update((float)frametime.smoothed_frame_time);
ImGui::Render();
SDL_GL_SwapWindow(sdl_window);
frametime.update();
}
