VulkanViewer on Android

tools/vulkan/android/Window_android.cpp

Index: tools/vulkan/android/Window_android.cpp
diff --git a/tools/vulkan/android/Window_android.cpp b/tools/vulkan/android/Window_android.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..fb87a3f606b206bcbfd8e06507736317b2be3881
--- /dev/null
+++ b/tools/vulkan/android/Window_android.cpp
@@ -0,0 +1,179 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#include "Window_android.h"
+
+#include "VulkanTestContext_android.h"
+
+Window* Window::CreateNativeWindow(void* platformData) {
+    Window_android* window = new Window_android();
+    if (!window->init((android_app*)platformData)) {
+        delete window;
+        return nullptr;
+    }
+    return window;
+}
+
+static void handle_cmd(struct android_app* app, int32_t cmd);
+static int32_t handle_input(struct android_app* app, AInputEvent* event);
+
+bool Window_android::init(android_app* app) {
+    SkASSERT(app);
+    mApp = app;
+    mApp->userData = this;
+    mApp->onAppCmd = handle_cmd;
+    mApp->onInputEvent = handle_input;
+    return true;
+}
+
+void Window_android::setTitle(const char* title) {
+    //todo
+    SkDebugf("Title: %s", title);
+}
+
+bool Window_android::attach(BackEndType attachType, int msaaSampleCount, AttachmentInfo*) {
+    if (kVulkan_BackendType != attachType) {
+        return false;
+    }
+
+    mSampleCount = msaaSampleCount;
+
+    // We delay the creation of fTestContext until Android informs us that
+    // the native window is ready to use.
+    return true;
+}
+
+void Window_android::initDisplay(ANativeWindow* window) {
+    SkASSERT(window);
+    ContextPlatformData_android platformData;
+    platformData.fNativeWindow = window;
+    fTestContext = VulkanTestContext::Create((void*)&platformData, mSampleCount);
+}
+
+static void android_app_write_cmd(struct android_app* android_app, int8_t cmd) {
+    if (write(android_app->msgwrite, &cmd, sizeof(cmd)) != sizeof(cmd)) {
+        SkDebugf("Failure writing android_app cmd: %s\n", strerror(errno));
+    }
+}
+
+void Window_android::inval() {
+	android_app_write_cmd(mApp, APP_CMD_INVAL_WINDOW);
+}
+
+void Window_android::paintIfNeeded() {
+    if (mApp->window || !mContentRect.isEmpty()) {
+        this->onPaint();
+    }
+}
+
+/**
+ * Process the next main command.
+ */
+static void handle_cmd(struct android_app* app, int32_t cmd) {
+    Window_android* window = (Window_android*)app->userData;
+    switch (cmd) {
+        case APP_CMD_INIT_WINDOW:
+            // The window is being shown, get it ready.
+            SkASSERT(app->window);
+            window->initDisplay(app->window);
+            window->paintIfNeeded();
+            break;
+        case APP_CMD_WINDOW_RESIZED: {
+            int width = ANativeWindow_getWidth(app->window);
+            int height = ANativeWindow_getHeight(app->window);
+            window->onResize(width, height);
+            break;
+        }
+        case APP_CMD_CONTENT_RECT_CHANGED:
+            window->setContentRect(app->contentRect.left, app->contentRect.top,
+                                   app->contentRect.right, app->contentRect.bottom);
+            window->paintIfNeeded();
+            break;
+        case APP_CMD_TERM_WINDOW:
+            // The window is being hidden or closed, clean it up.
+            window->detach();
+            break;
+        case APP_CMD_INVAL_WINDOW:
+            window->paintIfNeeded();
+            break;
+    }
+}
+
+static Window::Key get_key(int32_t keycode) {
+    static const struct {
+        int32_t     fAndroidKey;
+        Window::Key fWindowKey;
+    } gPair[] = {
+        { AKEYCODE_BACK, Window::kBack_Key },
+        { AKEYCODE_VOLUME_UP, Window::kLeft_Key },
+        { AKEYCODE_VOLUME_DOWN, Window::kRight_Key }
+    };
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gPair); i++) {
+        if (gPair[i].fAndroidKey == keycode) {
+            return gPair[i].fWindowKey;
+        }
+    }
+    return Window::kNONE_Key;
+}
+
+static Window::InputState get_action(int32_t action) {
+    static const struct {
+        int32_t            fAndroidAction;
+        Window::InputState fInputState;
+    } gPair[] = {
+        { AKEY_STATE_DOWN, Window::kDown_InputState },
+        { AKEY_STATE_UP, Window::kUp_InputState },
+    };
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gPair); i++) {
+        if (gPair[i].fAndroidAction == action) {
+            return gPair[i].fInputState;
+        }
+    }
+    return Window::kMove_InputState;
+}
+
+static int32_t get_key_modifiers(AInputEvent* event) {
+    static const struct {
+        int32_t fAndroidState;
+        int32_t fWindowModifier;
+    } gPair[] = {
+        { AMETA_SHIFT_ON, Window::kShift_ModifierKey },
+        { AMETA_CTRL_ON, Window::kControl_ModifierKey },
+    };
+
+    int32_t metaState = AKeyEvent_getMetaState(event);
+    int32_t modifiers = 0;
+
+    if (AKeyEvent_getRepeatCount(event) == 0) {
+    	modifiers |= Window::kFirstPress_ModifierKey;
+    }
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gPair); i++) {
+        if (gPair[i].fAndroidState == metaState) {
+            modifiers |= gPair[i].fWindowModifier;
+        }
+    }
+    return modifiers;
+}
+
+/**
+ * Process the next input event.
+ */
+static int32_t handle_input(struct android_app* app, AInputEvent* event) {
+    Window_android* window = (Window_android*)app->userData;
+    switch(AInputEvent_getType(event)) {
+        case AINPUT_EVENT_TYPE_MOTION:
+            break;
+        case AINPUT_EVENT_TYPE_KEY:
+            Window::Key key = get_key(AKeyEvent_getKeyCode(event));
+            Window::InputState state = get_action(AKeyEvent_getAction(event));
+            int32_t mod = get_key_modifiers(event);
+            window->onKey(key, state, mod);
+            return true; // eat all key events
+    }
+    return 0;
+}