cleaned code, added pinch gesture detector, better opengl context handling, fixed issues

Change-Id: I26a28374ae74391204586b4584d03cf0c58772c2

ndk/sources/android/helper/tapCamera.h

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <vector>
+#include <string>
+#include <GLES2/gl2.h>
+
+#include "JNIHelper.h"
+#include "vecmath.h"
+#include "interpolator.h"
+
+/******************************************************************
+ * Camera control helper class with a tap gesture
+ * This class is mainly used for 3D space camera control in samples.
+ *
+ */
+class tapCamera
+{
+private:
+    //Trackball
+    vec2 _vBallCenter;
+    float _fBallRadius;
+    quaternion _qBallNow;
+    quaternion _qBallDown;
+    vec2 _vBallNow;
+    vec2 _vBallDown;
+    quaternion _qBallRot;
+
+    bool _bDragging;
+    bool _bPinching;
+
+    //Pinch related info
+    vec2 _vecPinchStart;
+    vec2 _vecPinchStartCenter;
+    float _fPinchStartDistanceSQ;
+
+    //Camera shift
+    vec3 _vecOffset;
+    vec3 _vecOffsetNow;
+
+    //Camera Rotation
+    float _fRotation;
+    float _fRotationStart;
+    float _fRotationNow;
+
+    //Momentum support
+    bool _bMomentum;
+    vec2 _vDragDelta;
+    vec2 _vLastInput;
+    vec3 _vecOffsetLast;
+    vec3 _vecOffsetDelta;
+    float _fMomentumSteps;
+
+    vec2 _vFlip;
+    float _fFlipZ;
+
+    mat4 _mRotation;
+    mat4 _mTransform;
+
+    vec3 pointOnSphere(vec2& point);
+    void ballUpdate();
+    void initParameters();
+
+    vec3 _vPinchTransformFactor;
+
+public:
+    tapCamera();
+    virtual ~tapCamera();
+    void beginDrag(const vec2& vec);
+    void endDrag();
+    void drag(const vec2& vec);
+    void update();
+
+    mat4& getRotationMatrix();
+    mat4& getTransformMatrix();
+
+    void beginPinch(const vec2& v1, const vec2& v2);
+    void endPinch();
+    void pinch(const vec2& v1, const vec2& v2);
+
+    void setFlip(const float fX, const float fY, const float fZ)
+    {
+        _vFlip = vec2( fX, fY );
+        _fFlipZ = fZ;
+    }
+
+    void setPinchTransformFactor(const float fX, const float fY, const float fZ)
+    {
+        _vPinchTransformFactor = vec3( fX, fY, fZ);
+    }
+
+    void reset(const bool bAnimate);
+
+};