Refactor VR math off of GVR types, onto gfx types where possible.

chrome/browser/android/vr_shell/vr_math.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_MATH_H_
-#define CHROME_BROWSER_ANDROID_VR_SHELL_VR_MATH_H_
-
-#include <array>
-
-#include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr_types.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;
-
-typedef struct RotationAxisAngle {
-  float x;
-  float y;
-  float z;
-  float angle;
-} RotationAxisAngle;
-
-typedef struct Colorf {
-  float r;
-  float g;
-  float b;
-  float a;
-} Colorf;
-
-void SetIdentityM(gvr::Mat4f& mat);
-void TranslateM(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);
-
-// Util functions that are copied from the treasure_hunt NDK demo in
-// third_party/gvr-andoir-sdk/ folder.
-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);
-
-// Provides the direction the head is looking towards as a 3x1 unit vector.
-gvr::Vec3f GetForwardVector(const gvr::Mat4f& matrix);
-
-gvr::Vec3f GetTranslation(const gvr::Mat4f& matrix);
-
-gvr::Mat4f QuatToMatrix(const gvr::Quatf& quat);
-
-float VectorLength(const gvr::Vec3f& vec);
-gvr::Vec3f VectorSubtract(const gvr::Vec3f& a, const gvr::Vec3f& b);
-float VectorDot(const gvr::Vec3f& a, const gvr::Vec3f& b);
-
-// Normalize a vector, and return its original length.
-float NormalizeVector(gvr::Vec3f& vec);
-
-void NormalizeQuat(gvr::Quatf& quat);
-
-gvr::Quatf QuatFromAxisAngle(const gvr::Vec3f& axis, float angle);
-
-gvr::Vec3f GetRayPoint(const gvr::Vec3f& rayOrigin,
-                       const gvr::Vec3f& rayVector,
-                       float scale);
-
-float Distance(const gvr::Vec3f& vec1, const gvr::Vec3f& vec2);
-
-// Angle between the vectors' projections to the XZ plane.
-bool XZAngle(const gvr::Vec3f& vec1, const gvr::Vec3f& vec2, float* angle);
-
-}  // namespace vr_shell
-
-#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_MATH_H_