1/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8//  Inspired by Rob Johnson's most excellent QuickDraw GX sample code
9
10#ifndef SkCamera_DEFINED
11#define SkCamera_DEFINED
12
13#include "SkMatrix.h"
14
15class SkCanvas;
16
17struct SkUnit3D {
18    SkScalar fX, fY, fZ;
19
20    void set(SkScalar x, SkScalar y, SkScalar z) {
21        fX = x; fY = y; fZ = z;
22    }
23    static SkScalar Dot(const SkUnit3D&, const SkUnit3D&);
24    static void Cross(const SkUnit3D&, const SkUnit3D&, SkUnit3D* cross);
25};
26
27struct SkPoint3D {
28    SkScalar    fX, fY, fZ;
29
30    void set(SkScalar x, SkScalar y, SkScalar z) {
31        fX = x; fY = y; fZ = z;
32    }
33    SkScalar    normalize(SkUnit3D*) const;
34};
35typedef SkPoint3D SkVector3D;
36
37struct SkMatrix3D {
38    SkScalar    fMat[3][4];
39
40    void reset();
41
42    void setRow(int row, SkScalar a, SkScalar b, SkScalar c, SkScalar d = 0) {
43        SkASSERT((unsigned)row < 3);
44        fMat[row][0] = a;
45        fMat[row][1] = b;
46        fMat[row][2] = c;
47        fMat[row][3] = d;
48    }
49
50    void setRotateX(SkScalar deg);
51    void setRotateY(SkScalar deg);
52    void setRotateZ(SkScalar deg);
53    void setTranslate(SkScalar x, SkScalar y, SkScalar z);
54
55    void preRotateX(SkScalar deg);
56    void preRotateY(SkScalar deg);
57    void preRotateZ(SkScalar deg);
58    void preTranslate(SkScalar x, SkScalar y, SkScalar z);
59
60    void setConcat(const SkMatrix3D& a, const SkMatrix3D& b);
61    void mapPoint(const SkPoint3D& src, SkPoint3D* dst) const;
62    void mapVector(const SkVector3D& src, SkVector3D* dst) const;
63
64    void mapPoint(SkPoint3D* v) const {
65        this->mapPoint(*v, v);
66    }
67
68    void mapVector(SkVector3D* v) const {
69        this->mapVector(*v, v);
70    }
71};
72
73class SkPatch3D {
74public:
75    SkPatch3D();
76
77    void    reset();
78    void    transform(const SkMatrix3D&, SkPatch3D* dst = nullptr) const;
79
80    // dot a unit vector with the patch's normal
81    SkScalar dotWith(SkScalar dx, SkScalar dy, SkScalar dz) const;
82    SkScalar dotWith(const SkVector3D& v) const {
83        return this->dotWith(v.fX, v.fY, v.fZ);
84    }
85
86    // deprecated, but still here for animator (for now)
87    void rotate(SkScalar /*x*/, SkScalar /*y*/, SkScalar /*z*/) {}
88    void rotateDegrees(SkScalar /*x*/, SkScalar /*y*/, SkScalar /*z*/) {}
89
90private:
91public: // make public for SkDraw3D for now
92    SkVector3D  fU, fV;
93    SkPoint3D   fOrigin;
94
95    friend class SkCamera3D;
96};
97
98class SkCamera3D {
99public:
100    SkCamera3D();
101
102    void reset();
103    void update();
104    void patchToMatrix(const SkPatch3D&, SkMatrix* matrix) const;
105
106    SkPoint3D   fLocation;   // origin of the camera's space
107    SkPoint3D   fAxis;       // view direction
108    SkPoint3D   fZenith;     // up direction
109    SkPoint3D   fObserver;   // eye position (may not be the same as the origin)
110
111private:
112    mutable SkMatrix    fOrientation;
113    mutable bool        fNeedToUpdate;
114
115    void doUpdate() const;
116};
117
118class SK_API Sk3DView : SkNoncopyable {
119public:
120    Sk3DView();
121    ~Sk3DView();
122
123    void save();
124    void restore();
125
126    void translate(SkScalar x, SkScalar y, SkScalar z);
127    void rotateX(SkScalar deg);
128    void rotateY(SkScalar deg);
129    void rotateZ(SkScalar deg);
130
131#ifdef SK_BUILD_FOR_ANDROID
132    void setCameraLocation(SkScalar x, SkScalar y, SkScalar z);
133    SkScalar getCameraLocationX();
134    SkScalar getCameraLocationY();
135    SkScalar getCameraLocationZ();
136#endif
137
138    void getMatrix(SkMatrix*) const;
139    void applyToCanvas(SkCanvas*) const;
140
141    SkScalar dotWithNormal(SkScalar dx, SkScalar dy, SkScalar dz) const;
142
143private:
144    struct Rec {
145        Rec*        fNext;
146        SkMatrix3D  fMatrix;
147    };
148    Rec*        fRec;
149    Rec         fInitialRec;
150    SkCamera3D  fCamera;
151};
152
153#endif
154