Controller support for VrShell

chrome/browser/android/vr_shell/vr_gesture.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_ANDROID_VR_SHELL_VR_GESTURE_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_VR_GESTURE_H_
+
+#include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr_types.h"
+
+namespace vr_shell {
+
+typedef enum {
+  GESTURE_DIRECTION_UP,
+  GESTURE_DIRECTION_DOWN,
+  GESTURE_DIRECTION_LEFT,
+  GESTURE_DIRECTION_RIGHT
+} gesture_direction;
+
+typedef struct {
+  float dx, dy, dz;
+  float x, y;
+  float ordinal_dx, ordinal_dy, ordinal_dz;
+  int type;
+} GestureAngularMove;

[tdresser, 2016/09/23 17:45:17]

Throughout this file, it looks like we should be using 2 vectors and 3 vectors,
instead of a pile of floats.

[asimjour, 2016/09/23 19:56:31]

Done.

+
+typedef struct {
+  float dx, dy;
+  float ordinal_dx, ordinal_dy;
+  // If set, stop_fling means that this scroll should stop flinging, thus
+  // if an interpreter suppresses it for any reason (e.g., rounds the size
+  // down to 0, thus making it a noop), it will replace it with a Fling
+  // TAP_DOWN gesture
+  int state;
+  unsigned stop_fling : 1;
+  float initial_touch_pos_x;
+  float initial_touch_pos_y;
+} GestureScroll;
+
+typedef struct {
+  // fling velocity (valid when fling_state is GESTURES_FLING_START):
+  float vx, vy;
+  float ordinal_vx, ordinal_vy;
+  unsigned fling_state : 1;  // GESTURES_FLING_START or GESTURES_FLING_TAP_DOWN
+} GestureFling;
+
+typedef struct {
+  // zoom size; dz=1 means no zoom, dz < 1 means zoom-out, dz > 1 means zoom-in
+  float dz;
+} GestureZoom;
+
+typedef struct {
+  // If a bit is set in both down and up, client should process down first
+  int x;
+  int y;
+  unsigned down;  // bit field, use GESTURES_BUTTON_*
+  unsigned up;    // bit field, use GESTURES_BUTTON_*
+} GestureButtonsChange;
+
+enum GestureType {
+  kGestureTypeNull,
+  kGestureTypeAngularMove,
+  kGestureTypeScroll,
+  kGestureTypeButtonsChange,
+  kGestureTypeFling,
+  kGestureTypeZoom,
+};
+
+struct VrGesture {
+  VrGesture() : type(kGestureTypeNull) {}
+  VrGesture(const GestureAngularMove&,
+            int64_t start,
+            int64_t end,
+            gvr::Quatf quat)
+      : start_time(start),
+        end_time(end),
+        type(kGestureTypeAngularMove),
+        quat(quat) {}
+  VrGesture(const GestureScroll&,
+            int64_t start,
+            int64_t end,
+            float dx,
+            float dy,
+            int state,
+            gvr::Quatf quat)
+      : start_time(start), end_time(end), type(kGestureTypeScroll), quat(quat) {
+    details.scroll.ordinal_dx = details.scroll.dx = dx;
+    details.scroll.ordinal_dy = details.scroll.dy = dy;
+    details.scroll.state = state;
+    details.scroll.stop_fling = 0;
+  }
+  VrGesture(const GestureButtonsChange&,
+            int64_t start,
+            int64_t end,
+            unsigned down,
+            unsigned up,
+            gvr::Quatf quat)
+      : start_time(start),
+        end_time(end),
+        type(kGestureTypeButtonsChange),
+        quat(quat) {
+    details.buttons.down = down;
+    details.buttons.up = up;
+    details.buttons.x = 0;
+    details.buttons.y = 0;
+  }
+  VrGesture(const GestureFling&,
+            int64_t start,
+            int64_t end,
+            float vx,
+            float vy,
+            unsigned state,
+            gvr::Quatf quat)
+      : start_time(start), end_time(end), type(kGestureTypeFling), quat(quat) {
+    details.fling.ordinal_vx = details.fling.vx = vx;
+    details.fling.ordinal_vy = details.fling.vy = vy;
+    details.fling.fling_state = state;
+  }
+  VrGesture(const GestureZoom&,
+            int64_t start,
+            int64_t end,
+            float dz,
+            gvr::Quatf quat)
+      : start_time(start), end_time(end), type(kGestureTypeZoom), quat(quat) {
+    details.zoom.dz = dz;
+  }
+
+  int64_t start_time, end_time;
+  enum GestureType type;
+  union {
+    GestureScroll scroll;
+    GestureButtonsChange buttons;
+    GestureFling fling;
+    GestureZoom zoom;
+    GestureAngularMove move;
+  } details;
+  gvr::Quatf quat;
+  gvr::Vec2f velocity;
+  gvr::Vec2f displacement;
+  gesture_direction direction;
+};
+
+const GestureScroll kGestureScroll = {0, 0, 0, 0, 0, 0};
+const GestureButtonsChange kGestureButtonsChange = {0, 0, 0, 0};
+const GestureAngularMove kGestureAngularMove = {0, 0, 0, 0, 0, 0, 0, 0, 0};
+const GestureZoom kGestureZoom = {0};
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_GESTURE_H_