Refactor Vr activity into ChromeTabbedActivity.

chrome/browser/android/vr_shell/vr_util.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_UTIL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_UTIL_H_
 
 #include <string>
 
 #include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr_types.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace vr_shell {
 
+// 2D rectangles. Unlike gvr::Rectf and gvr::Recti, these have width and height
+// rather than right and top.
+typedef struct Recti {
+  int x;
+  int y;
+  int width;
+  int height;
+} Recti;
+
+typedef struct Rectf {
+  float x;
+  float y;
+  float width;
+  float height;
+} Rectf;
+
+void SetIdentityM(gvr::Mat4f& mat);
+
+void TranslateM(gvr::Mat4f& tmat, gvr::Mat4f& mat, float x, float y, float z);
+void TranslateMRight(gvr::Mat4f& tmat,
+                     gvr::Mat4f& mat,
+                     float x,
+                     float y,
+                     float z);
+
+void ScaleM(gvr::Mat4f& tmat, const gvr::Mat4f& mat, float x, float y, float z);
+void ScaleMRight(gvr::Mat4f& tmat, const gvr::Mat4f& mat,
+                 float x, float y, float z);
+
 std::array<float, 16> MatrixToGLArray(const gvr::Mat4f& matrix);
 
 // Util functions that are copied from the treasure_hunt NDK demo in
 // third_party/gvr-andoir-sdk/ folder.
 gvr::Mat4f MatrixTranspose(const gvr::Mat4f& mat);
+std::array<float, 4> MatrixVectorMul(const gvr::Mat4f& matrix,
+                                     const std::array<float, 4>& vec);
+std::array<float, 3> MatrixVectorMul(const gvr::Mat4f& matrix,
+                                     const std::array<float, 3>& vec);
+gvr::Vec3f MatrixVectorMul(const gvr::Mat4f& m, const gvr::Vec3f& v);
+gvr::Vec3f MatrixVectorRotate(const gvr::Mat4f& m, const gvr::Vec3f& v);
 gvr::Mat4f MatrixMul(const gvr::Mat4f& matrix1, const gvr::Mat4f& matrix2);
 gvr::Mat4f PerspectiveMatrixFromView(const gvr::Rectf& fov,
                                      float z_near,
                                      float z_far);
 gvr::Rectf ModulateRect(const gvr::Rectf& rect, float width, float height);
 gvr::Recti CalculatePixelSpaceRect(const gvr::Sizei& texture_size,
                                    const gvr::Rectf& texture_rect);
 
+// Provides the direction the head is looking towards as a 3x1 unit vector.
+gvr::Vec3f getForwardVector(const gvr::Mat4f& matrix);
+
+// Provides the relative translation of the head as a 3x1 vector.
+gvr::Vec3f getTranslation(const gvr::Mat4f& matrix);
+
 // Compile a shader.
 GLuint CompileShader(GLenum shader_type,
                      const GLchar* shader_source,
                      std::string& error);
 
 // Compile and link a program.
 GLuint CreateAndLinkProgram(GLuint vertex_shader_handle,
                             GLuint fragment_shader_handle,
                             int num_attributes,
                             const GLchar** attributes,
                             std::string& error);
 
+gvr::Quatf QuatMultiply(const gvr::Quatf& a, const gvr::Quatf& b);
+
+gvr::Mat4f QuatToMatrix(const gvr::Quatf& quat);
+
+float VectorLength(const gvr::Vec3f& vec);
+
+void NormalizeVector(gvr::Vec3f& vec);
+
+float VectorDot(const gvr::Vec3f& a, const gvr::Vec3f& b);
+
+void NormalizeQuat(gvr::Quatf& quat);
+
+gvr::Quatf QuatFromAxisAngle(float x, float y, float z, float angle);
+
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_UTIL_H_