Add VR Shell animation classes and unit test.

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_