bool init(void)
{
SGE_ASSERT(details::g_window == NULL);
SGE_ASSERT(details::g_gl_context == NULL);
SGE_LOGD("Creating OpenGL window...\n");
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
#ifdef SGE_DEBUG
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
#endif
details::g_window = SDL_CreateWindow("SGE",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600,
SDL_WINDOW_RESIZABLE | SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI);
if (details::g_window == NULL)
return false;
details::g_window_id = SDL_GetWindowID(details::g_window);
SDL_GetWindowPosition(details::g_window, &details::g_window_rect[0], &details::g_window_rect[1]);
SDL_GetWindowSize(details::g_window, &details::g_window_rect[2], &details::g_window_rect[3]);
SGE_LOGD("Initializing OpenGL...\n");
details::g_gl_context = SDL_GL_CreateContext(details::g_window);
if (details::g_gl_context == NULL) {
SGE_LOGE("Failed to create OpenGL context.\n");
SDL_DestroyWindow(details::g_window);
details::g_window = NULL;
return false;
}
SDL_GL_MakeCurrent(details::g_window, details::g_gl_context);
glewExperimental = GL_TRUE;
if (glewInit() != GLEW_OK) {
SGE_LOGE("Failed to initialize GLEW.\n");
SDL_GL_DeleteContext(details::g_gl_context);
details::g_gl_context = NULL;
SDL_DestroyWindow(details::g_window);
details::g_window = NULL;
return false;
}
#ifdef SGE_DEBUG
if (GL_KHR_debug) {
SGE_LOGD("Enable OpenGL debug output.\n");
glDebugMessageCallback(gl_debug_output, NULL);
}
#endif
SGE_LOGI("GLEW: %s\n", glewGetString(GLEW_VERSION));
SGE_LOGI("OpenGL: %s\n", glGetString(GL_VERSION));
IMGUI_CHECKVERSION();
s_imgui_context = ImGui::CreateContext();
if (s_imgui_context == NULL) {
SGE_LOGE("Failed to initialize ImGui.\n");
SDL_GL_DeleteContext(details::g_gl_context);
details::g_gl_context = NULL;
SDL_DestroyWindow(details::g_window);
details::g_window = NULL;
return false;
}
ImGui::SetCurrentContext(s_imgui_context);
ImGuiIO &io = ImGui::GetIO();
io.IniFilename = NULL;
SGE_LOGI("ImGui: %s\n", ImGui::GetVersion());
ImGui::StyleColorsDark();
ImGuiStyle &style = ImGui::GetStyle();
style.Alpha = 1.1f;
style.WindowRounding = 0.0f;
style.WindowBorderSize = 1.0f;
style.ChildRounding = 0.0f;
style.ChildBorderSize = 0.0f;
style.PopupRounding = 0.0f;
style.PopupBorderSize = 0.0f;
ImGui_ImplSDL2_InitForOpenGL(details::g_window, details::g_gl_context);
ImGui_ImplOpenGL3_Init("#version 130");
if (!init_program()) {
SGE_LOGE("Failed to initialize ImGui.\n");
SDL_GL_DeleteContext(details::g_gl_context);
details::g_gl_context = NULL;
SDL_DestroyWindow(details::g_window);
details::g_window = NULL;
return false;
}
s_uniform_mat4[UNIFORM_MODEL_MATRIX] = glm::mat4(1.0f);
s_uniform_mat4[UNIFORM_VIEW_MATRIX] = glm::mat4(1.0f);
s_uniform_mat4[UNIFORM_PROJECTION_MATRIX] = glm::frustum(-1.0f, 1.0f, -1.0f, 1.0f, 0.5f, 999.0f);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
init_test();
return true;
}
int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 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_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
SDL_GLContext gl_context = SDL_GL_CreateContext(window);
SDL_GL_SetSwapInterval(1); // Enable vsync
// Setup Dear ImGui context
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO(); (void)io;
//io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
//io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
// Setup Dear ImGui style
ImGui::StyleColorsDark();
//ImGui::StyleColorsClassic();
// Setup Platform/Renderer bindings
ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
ImGui_ImplOpenGL2_Init();
// 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)
{
// Poll and handle events (inputs, window resize, etc.)
// 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_ImplSDL2_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
}
// Start the Dear ImGui frame
ImGui_ImplOpenGL2_NewFrame();
ImGui_ImplSDL2_NewFrame(window);
ImGui::NewFrame();
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
{
static float f = 0.0f;
static int counter = 0;
ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
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
if (ImGui::Button("Button")) // Buttons return true when clicked (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);
ImGui::End();
}
// 3. Show another simple window.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// Rendering
ImGui::Render();
glViewport(0, 0, (int)io.DisplaySize.x, (int)io.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_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
SDL_GL_SwapWindow(window);
}
// Cleanup
ImGui_ImplOpenGL2_Shutdown();
ImGui_ImplSDL2_Shutdown();
ImGui::DestroyContext();
SDL_GL_DeleteContext(gl_context);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
