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