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Diffstat (limited to 'lib/imgui-1.90.7/examples/example_android_opengl3/main.cpp')
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1 files changed, 383 insertions, 0 deletions
diff --git a/lib/imgui-1.90.7/examples/example_android_opengl3/main.cpp b/lib/imgui-1.90.7/examples/example_android_opengl3/main.cpp new file mode 100644 index 0000000..e0ad5f9 --- /dev/null +++ b/lib/imgui-1.90.7/examples/example_android_opengl3/main.cpp @@ -0,0 +1,383 @@ +// dear imgui: standalone example application for Android + OpenGL ES 3 + +// Learn about Dear ImGui: +// - FAQ https://dearimgui.com/faq +// - Getting Started https://dearimgui.com/getting-started +// - Documentation https://dearimgui.com/docs (same as your local docs/ folder). +// - Introduction, links and more at the top of imgui.cpp + +#include "imgui.h" +#include "imgui_impl_android.h" +#include "imgui_impl_opengl3.h" +#include <android/log.h> +#include <android_native_app_glue.h> +#include <android/asset_manager.h> +#include <EGL/egl.h> +#include <GLES3/gl3.h> +#include <string> + +// Data +static EGLDisplay g_EglDisplay = EGL_NO_DISPLAY; +static EGLSurface g_EglSurface = EGL_NO_SURFACE; +static EGLContext g_EglContext = EGL_NO_CONTEXT; +static struct android_app* g_App = nullptr; +static bool g_Initialized = false; +static char g_LogTag[] = "ImGuiExample"; +static std::string g_IniFilename = ""; + +// Forward declarations of helper functions +static void Init(struct android_app* app); +static void Shutdown(); +static void MainLoopStep(); +static int ShowSoftKeyboardInput(); +static int PollUnicodeChars(); +static int GetAssetData(const char* filename, void** out_data); + +// Main code +static void handleAppCmd(struct android_app* app, int32_t appCmd) +{ + switch (appCmd) + { + case APP_CMD_SAVE_STATE: + break; + case APP_CMD_INIT_WINDOW: + Init(app); + break; + case APP_CMD_TERM_WINDOW: + Shutdown(); + break; + case APP_CMD_GAINED_FOCUS: + case APP_CMD_LOST_FOCUS: + break; + } +} + +static int32_t handleInputEvent(struct android_app* app, AInputEvent* inputEvent) +{ + return ImGui_ImplAndroid_HandleInputEvent(inputEvent); +} + +void android_main(struct android_app* app) +{ + app->onAppCmd = handleAppCmd; + app->onInputEvent = handleInputEvent; + + while (true) + { + int out_events; + struct android_poll_source* out_data; + + // Poll all events. If the app is not visible, this loop blocks until g_Initialized == true. + while (ALooper_pollAll(g_Initialized ? 0 : -1, nullptr, &out_events, (void**)&out_data) >= 0) + { + // Process one event + if (out_data != nullptr) + out_data->process(app, out_data); + + // Exit the app by returning from within the infinite loop + if (app->destroyRequested != 0) + { + // shutdown() should have been called already while processing the + // app command APP_CMD_TERM_WINDOW. But we play save here + if (!g_Initialized) + Shutdown(); + + return; + } + } + + // Initiate a new frame + MainLoopStep(); + } +} + +void Init(struct android_app* app) +{ + if (g_Initialized) + return; + + g_App = app; + ANativeWindow_acquire(g_App->window); + + // Initialize EGL + // This is mostly boilerplate code for EGL... + { + g_EglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY); + if (g_EglDisplay == EGL_NO_DISPLAY) + __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglGetDisplay(EGL_DEFAULT_DISPLAY) returned EGL_NO_DISPLAY"); + + if (eglInitialize(g_EglDisplay, 0, 0) != EGL_TRUE) + __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglInitialize() returned with an error"); + + const EGLint egl_attributes[] = { EGL_BLUE_SIZE, 8, EGL_GREEN_SIZE, 8, EGL_RED_SIZE, 8, EGL_DEPTH_SIZE, 24, EGL_SURFACE_TYPE, EGL_WINDOW_BIT, EGL_NONE }; + EGLint num_configs = 0; + if (eglChooseConfig(g_EglDisplay, egl_attributes, nullptr, 0, &num_configs) != EGL_TRUE) + __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglChooseConfig() returned with an error"); + if (num_configs == 0) + __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglChooseConfig() returned 0 matching config"); + + // Get the first matching config + EGLConfig egl_config; + eglChooseConfig(g_EglDisplay, egl_attributes, &egl_config, 1, &num_configs); + EGLint egl_format; + eglGetConfigAttrib(g_EglDisplay, egl_config, EGL_NATIVE_VISUAL_ID, &egl_format); + ANativeWindow_setBuffersGeometry(g_App->window, 0, 0, egl_format); + + const EGLint egl_context_attributes[] = { EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE }; + g_EglContext = eglCreateContext(g_EglDisplay, egl_config, EGL_NO_CONTEXT, egl_context_attributes); + + if (g_EglContext == EGL_NO_CONTEXT) + __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglCreateContext() returned EGL_NO_CONTEXT"); + + g_EglSurface = eglCreateWindowSurface(g_EglDisplay, egl_config, g_App->window, nullptr); + eglMakeCurrent(g_EglDisplay, g_EglSurface, g_EglSurface, g_EglContext); + } + + // Setup Dear ImGui context + IMGUI_CHECKVERSION(); + ImGui::CreateContext(); + ImGuiIO& io = ImGui::GetIO(); + + // Redirect loading/saving of .ini file to our location. + // Make sure 'g_IniFilename' persists while we use Dear ImGui. + g_IniFilename = std::string(app->activity->internalDataPath) + "/imgui.ini"; + io.IniFilename = g_IniFilename.c_str();; + + // Setup Dear ImGui style + ImGui::StyleColorsDark(); + //ImGui::StyleColorsLight(); + + // Setup Platform/Renderer backends + ImGui_ImplAndroid_Init(g_App->window); + ImGui_ImplOpenGL3_Init("#version 300 es"); + + // 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. + // - If the file cannot be loaded, the function will return a nullptr. 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 'docs/FONTS.md' 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 \\ ! + // - Android: The TTF files have to be placed into the assets/ directory (android/app/src/main/assets), we use our GetAssetData() helper to retrieve them. + + // We load the default font with increased size to improve readability on many devices with "high" DPI. + // FIXME: Put some effort into DPI awareness. + // Important: when calling AddFontFromMemoryTTF(), ownership of font_data is transferred by Dear ImGui by default (deleted is handled by Dear ImGui), unless we set FontDataOwnedByAtlas=false in ImFontConfig + ImFontConfig font_cfg; + font_cfg.SizePixels = 22.0f; + io.Fonts->AddFontDefault(&font_cfg); + //void* font_data; + //int font_data_size; + //ImFont* font; + //font_data_size = GetAssetData("segoeui.ttf", &font_data); + //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 16.0f); + //IM_ASSERT(font != nullptr); + //font_data_size = GetAssetData("DroidSans.ttf", &font_data); + //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 16.0f); + //IM_ASSERT(font != nullptr); + //font_data_size = GetAssetData("Roboto-Medium.ttf", &font_data); + //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 16.0f); + //IM_ASSERT(font != nullptr); + //font_data_size = GetAssetData("Cousine-Regular.ttf", &font_data); + //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 15.0f); + //IM_ASSERT(font != nullptr); + //font_data_size = GetAssetData("ArialUni.ttf", &font_data); + //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese()); + //IM_ASSERT(font != nullptr); + + // Arbitrary scale-up + // FIXME: Put some effort into DPI awareness + ImGui::GetStyle().ScaleAllSizes(3.0f); + + g_Initialized = true; +} + +void MainLoopStep() +{ + ImGuiIO& io = ImGui::GetIO(); + if (g_EglDisplay == EGL_NO_DISPLAY) + return; + + // Our state + // (we use static, which essentially makes the variable globals, as a convenience to keep the example code easy to follow) + static bool show_demo_window = true; + static bool show_another_window = false; + static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f); + + // Poll Unicode characters via JNI + // FIXME: do not call this every frame because of JNI overhead + PollUnicodeChars(); + + // Open on-screen (soft) input if requested by Dear ImGui + static bool WantTextInputLast = false; + if (io.WantTextInput && !WantTextInputLast) + ShowSoftKeyboardInput(); + WantTextInputLast = io.WantTextInput; + + // Start the Dear ImGui frame + ImGui_ImplOpenGL3_NewFrame(); + ImGui_ImplAndroid_NewFrame(); + 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 create 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 / io.Framerate, io.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.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w); + glClear(GL_COLOR_BUFFER_BIT); + ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData()); + eglSwapBuffers(g_EglDisplay, g_EglSurface); +} + +void Shutdown() +{ + if (!g_Initialized) + return; + + // Cleanup + ImGui_ImplOpenGL3_Shutdown(); + ImGui_ImplAndroid_Shutdown(); + ImGui::DestroyContext(); + + if (g_EglDisplay != EGL_NO_DISPLAY) + { + eglMakeCurrent(g_EglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); + + if (g_EglContext != EGL_NO_CONTEXT) + eglDestroyContext(g_EglDisplay, g_EglContext); + + if (g_EglSurface != EGL_NO_SURFACE) + eglDestroySurface(g_EglDisplay, g_EglSurface); + + eglTerminate(g_EglDisplay); + } + + g_EglDisplay = EGL_NO_DISPLAY; + g_EglContext = EGL_NO_CONTEXT; + g_EglSurface = EGL_NO_SURFACE; + ANativeWindow_release(g_App->window); + + g_Initialized = false; +} + +// Helper functions + +// Unfortunately, there is no way to show the on-screen input from native code. +// Therefore, we call ShowSoftKeyboardInput() of the main activity implemented in MainActivity.kt via JNI. +static int ShowSoftKeyboardInput() +{ + JavaVM* java_vm = g_App->activity->vm; + JNIEnv* java_env = nullptr; + + jint jni_return = java_vm->GetEnv((void**)&java_env, JNI_VERSION_1_6); + if (jni_return == JNI_ERR) + return -1; + + jni_return = java_vm->AttachCurrentThread(&java_env, nullptr); + if (jni_return != JNI_OK) + return -2; + + jclass native_activity_clazz = java_env->GetObjectClass(g_App->activity->clazz); + if (native_activity_clazz == nullptr) + return -3; + + jmethodID method_id = java_env->GetMethodID(native_activity_clazz, "showSoftInput", "()V"); + if (method_id == nullptr) + return -4; + + java_env->CallVoidMethod(g_App->activity->clazz, method_id); + + jni_return = java_vm->DetachCurrentThread(); + if (jni_return != JNI_OK) + return -5; + + return 0; +} + +// Unfortunately, the native KeyEvent implementation has no getUnicodeChar() function. +// Therefore, we implement the processing of KeyEvents in MainActivity.kt and poll +// the resulting Unicode characters here via JNI and send them to Dear ImGui. +static int PollUnicodeChars() +{ + JavaVM* java_vm = g_App->activity->vm; + JNIEnv* java_env = nullptr; + + jint jni_return = java_vm->GetEnv((void**)&java_env, JNI_VERSION_1_6); + if (jni_return == JNI_ERR) + return -1; + + jni_return = java_vm->AttachCurrentThread(&java_env, nullptr); + if (jni_return != JNI_OK) + return -2; + + jclass native_activity_clazz = java_env->GetObjectClass(g_App->activity->clazz); + if (native_activity_clazz == nullptr) + return -3; + + jmethodID method_id = java_env->GetMethodID(native_activity_clazz, "pollUnicodeChar", "()I"); + if (method_id == nullptr) + return -4; + + // Send the actual characters to Dear ImGui + ImGuiIO& io = ImGui::GetIO(); + jint unicode_character; + while ((unicode_character = java_env->CallIntMethod(g_App->activity->clazz, method_id)) != 0) + io.AddInputCharacter(unicode_character); + + jni_return = java_vm->DetachCurrentThread(); + if (jni_return != JNI_OK) + return -5; + + return 0; +} + +// Helper to retrieve data placed into the assets/ directory (android/app/src/main/assets) +static int GetAssetData(const char* filename, void** outData) +{ + int num_bytes = 0; + AAsset* asset_descriptor = AAssetManager_open(g_App->activity->assetManager, filename, AASSET_MODE_BUFFER); + if (asset_descriptor) + { + num_bytes = AAsset_getLength(asset_descriptor); + *outData = IM_ALLOC(num_bytes); + int64_t num_bytes_read = AAsset_read(asset_descriptor, *outData, num_bytes); + AAsset_close(asset_descriptor); + IM_ASSERT(num_bytes_read == num_bytes); + } + return num_bytes; +} |