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1 
2 /*
3  * Copyright 2006 The Android Open Source Project
4  *
5  * Use of this source code is governed by a BSD-style license that can be
6  * found in the LICENSE file.
7  */
8 
9 
10 
11 
12 //  Inspired by Rob Johnson's most excellent QuickDraw GX sample code
13 
14 #ifndef SkCamera_DEFINED
15 #define SkCamera_DEFINED
16 
17 #include "Sk64.h"
18 #include "SkMatrix.h"
19 
20 class SkCanvas;
21 
22 #ifdef SK_SCALAR_IS_FIXED
23     typedef SkFract SkUnitScalar;
24     #define SK_UnitScalar1          SK_Fract1
25     #define SkUnitScalarMul(a, b)   SkFractMul(a, b)
26     #define SkUnitScalarDiv(a, b)   SkFractDiv(a, b)
27 #else
28     typedef float   SkUnitScalar;
29     #define SK_UnitScalar1          SK_Scalar1
30     #define SkUnitScalarMul(a, b)   SkScalarMul(a, b)
31     #define SkUnitScalarDiv(a, b)   SkScalarDiv(a, b)
32 #endif
33 
34 struct SkUnit3D {
35     SkUnitScalar    fX, fY, fZ;
36 
setSkUnit3D37     void set(SkUnitScalar x, SkUnitScalar y, SkUnitScalar z)
38     {
39         fX = x; fY = y; fZ = z;
40     }
41     static SkUnitScalar Dot(const SkUnit3D&, const SkUnit3D&);
42     static void Cross(const SkUnit3D&, const SkUnit3D&, SkUnit3D* cross);
43 };
44 
45 struct SkPoint3D {
46     SkScalar    fX, fY, fZ;
47 
setSkPoint3D48     void set(SkScalar x, SkScalar y, SkScalar z)
49     {
50         fX = x; fY = y; fZ = z;
51     }
52     SkScalar    normalize(SkUnit3D*) const;
53 };
54 typedef SkPoint3D SkVector3D;
55 
56 struct SkMatrix3D {
57     SkScalar    fMat[3][4];
58 
59     void reset();
60 
61     void setRow(int row, SkScalar a, SkScalar b, SkScalar c, SkScalar d = 0)
62     {
63         SkASSERT((unsigned)row < 3);
64         fMat[row][0] = a;
65         fMat[row][1] = b;
66         fMat[row][2] = c;
67         fMat[row][3] = d;
68     }
69 
70     void setRotateX(SkScalar deg);
71     void setRotateY(SkScalar deg);
72     void setRotateZ(SkScalar deg);
73     void setTranslate(SkScalar x, SkScalar y, SkScalar z);
74 
75     void preRotateX(SkScalar deg);
76     void preRotateY(SkScalar deg);
77     void preRotateZ(SkScalar deg);
78     void preTranslate(SkScalar x, SkScalar y, SkScalar z);
79 
80     void setConcat(const SkMatrix3D& a, const SkMatrix3D& b);
81     void mapPoint(const SkPoint3D& src, SkPoint3D* dst) const;
82     void mapVector(const SkVector3D& src, SkVector3D* dst) const;
83 
mapPointSkMatrix3D84     void mapPoint(SkPoint3D* v) const
85     {
86         this->mapPoint(*v, v);
87     }
mapVectorSkMatrix3D88     void mapVector(SkVector3D* v) const
89     {
90         this->mapVector(*v, v);
91     }
92 };
93 
94 class SkPatch3D {
95 public:
96     SkPatch3D();
97 
98     void    reset();
99     void    transform(const SkMatrix3D&, SkPatch3D* dst = NULL) const;
100 
101     // dot a unit vector with the patch's normal
102     SkScalar dotWith(SkScalar dx, SkScalar dy, SkScalar dz) const;
dotWith(const SkVector3D & v)103     SkScalar dotWith(const SkVector3D& v) const
104     {
105         return this->dotWith(v.fX, v.fY, v.fZ);
106     }
107 
108     // depreicated, but still here for animator (for now)
rotate(SkScalar x,SkScalar y,SkScalar z)109     void rotate(SkScalar x, SkScalar y, SkScalar z) {}
rotateDegrees(SkScalar x,SkScalar y,SkScalar z)110     void rotateDegrees(SkScalar x, SkScalar y, SkScalar z) {}
111 
112 private:
113 public: // make public for SkDraw3D for now
114     SkVector3D  fU, fV;
115     SkPoint3D   fOrigin;
116 
117     friend class SkCamera3D;
118 };
119 
120 class SkCamera3D {
121 public:
122     SkCamera3D();
123 
124     void reset();
125     void update();
126     void patchToMatrix(const SkPatch3D&, SkMatrix* matrix) const;
127 
128     SkPoint3D   fLocation;
129     SkPoint3D   fAxis;
130     SkPoint3D   fZenith;
131     SkPoint3D   fObserver;
132 
133 private:
134     mutable SkMatrix    fOrientation;
135     mutable bool        fNeedToUpdate;
136 
137     void doUpdate() const;
138 };
139 
140 class Sk3DView : SkNoncopyable {
141 public:
142     Sk3DView();
143     ~Sk3DView();
144 
145     void save();
146     void restore();
147 
148     void translate(SkScalar x, SkScalar y, SkScalar z);
149     void rotateX(SkScalar deg);
150     void rotateY(SkScalar deg);
151     void rotateZ(SkScalar deg);
152 
153 #ifdef SK_BUILD_FOR_ANDROID
154     void setCameraLocation(SkScalar x, SkScalar y, SkScalar z);
155     SkScalar getCameraLocationX();
156     SkScalar getCameraLocationY();
157     SkScalar getCameraLocationZ();
158 #endif
159 
160     void getMatrix(SkMatrix*) const;
161     void applyToCanvas(SkCanvas*) const;
162 
163     SkScalar dotWithNormal(SkScalar dx, SkScalar dy, SkScalar dz) const;
164 
165 private:
166     struct Rec {
167         Rec*        fNext;
168         SkMatrix3D  fMatrix;
169     };
170     Rec*        fRec;
171     Rec         fInitialRec;
172     SkCamera3D  fCamera;
173 };
174 
175 #endif
176 
177