reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | |
| 19 | // Inspired by Rob Johnson's most excellent QuickDraw GX sample code |
| 20 | |
| 21 | #ifndef SkCamera_DEFINED |
| 22 | #define SkCamera_DEFINED |
| 23 | |
| 24 | #include "Sk64.h" |
| 25 | #include "SkMatrix.h" |
| 26 | |
| 27 | class SkCanvas; |
| 28 | |
| 29 | #ifdef SK_SCALAR_IS_FIXED |
| 30 | typedef SkFract SkUnitScalar; |
| 31 | #define SK_UnitScalar1 SK_Fract1 |
| 32 | #define SkUnitScalarMul(a, b) SkFractMul(a, b) |
| 33 | #define SkUnitScalarDiv(a, b) SkFractDiv(a, b) |
| 34 | #else |
| 35 | typedef float SkUnitScalar; |
| 36 | #define SK_UnitScalar1 SK_Scalar1 |
| 37 | #define SkUnitScalarMul(a, b) SkScalarMul(a, b) |
| 38 | #define SkUnitScalarDiv(a, b) SkScalarDiv(a, b) |
| 39 | #endif |
| 40 | |
| 41 | struct SkUnit3D { |
| 42 | SkUnitScalar fX, fY, fZ; |
| 43 | |
| 44 | void set(SkUnitScalar x, SkUnitScalar y, SkUnitScalar z) |
| 45 | { |
| 46 | fX = x; fY = y; fZ = z; |
| 47 | } |
| 48 | static SkUnitScalar Dot(const SkUnit3D&, const SkUnit3D&); |
| 49 | static void Cross(const SkUnit3D&, const SkUnit3D&, SkUnit3D* cross); |
| 50 | }; |
| 51 | |
| 52 | struct SkPoint3D { |
| 53 | SkScalar fX, fY, fZ; |
| 54 | |
| 55 | void set(SkScalar x, SkScalar y, SkScalar z) |
| 56 | { |
| 57 | fX = x; fY = y; fZ = z; |
| 58 | } |
| 59 | SkScalar normalize(SkUnit3D*) const; |
| 60 | }; |
| 61 | typedef SkPoint3D SkVector3D; |
| 62 | |
| 63 | struct SkMatrix3D { |
| 64 | SkScalar fMat[3][4]; |
| 65 | |
| 66 | void reset(); |
| 67 | |
| 68 | void setRow(int row, SkScalar a, SkScalar b, SkScalar c, SkScalar d = 0) |
| 69 | { |
| 70 | SkASSERT((unsigned)row < 3); |
| 71 | fMat[row][0] = a; |
| 72 | fMat[row][1] = b; |
| 73 | fMat[row][2] = c; |
| 74 | fMat[row][3] = d; |
| 75 | } |
| 76 | |
| 77 | void setRotateX(SkScalar deg); |
| 78 | void setRotateY(SkScalar deg); |
| 79 | void setRotateZ(SkScalar deg); |
| 80 | void setTranslate(SkScalar x, SkScalar y, SkScalar z); |
| 81 | |
| 82 | void preRotateX(SkScalar deg); |
| 83 | void preRotateY(SkScalar deg); |
| 84 | void preRotateZ(SkScalar deg); |
| 85 | void preTranslate(SkScalar x, SkScalar y, SkScalar z); |
| 86 | |
| 87 | void setConcat(const SkMatrix3D& a, const SkMatrix3D& b); |
| 88 | void mapPoint(const SkPoint3D& src, SkPoint3D* dst) const; |
| 89 | void mapVector(const SkVector3D& src, SkVector3D* dst) const; |
| 90 | |
| 91 | void mapPoint(SkPoint3D* v) const |
| 92 | { |
| 93 | this->mapPoint(*v, v); |
| 94 | } |
| 95 | void mapVector(SkVector3D* v) const |
| 96 | { |
| 97 | this->mapVector(*v, v); |
| 98 | } |
| 99 | }; |
| 100 | |
| 101 | class SkPatch3D { |
| 102 | public: |
| 103 | SkPatch3D(); |
| 104 | |
| 105 | void reset(); |
| 106 | void transform(const SkMatrix3D&, SkPatch3D* dst = NULL) const; |
| 107 | |
| 108 | // dot a unit vector with the patch's normal |
| 109 | SkScalar dotWith(SkScalar dx, SkScalar dy, SkScalar dz) const; |
| 110 | SkScalar dotWith(const SkVector3D& v) const |
| 111 | { |
| 112 | return this->dotWith(v.fX, v.fY, v.fZ); |
| 113 | } |
| 114 | |
| 115 | // depreicated, but still here for animator (for now) |
| 116 | void rotate(SkScalar x, SkScalar y, SkScalar z) {} |
| 117 | void rotateDegrees(SkScalar x, SkScalar y, SkScalar z) {} |
| 118 | |
| 119 | private: |
| 120 | public: // make public for SkDraw3D for now |
| 121 | SkVector3D fU, fV; |
| 122 | SkPoint3D fOrigin; |
| 123 | |
| 124 | friend class SkCamera3D; |
| 125 | }; |
| 126 | |
| 127 | class SkCamera3D { |
| 128 | public: |
| 129 | SkCamera3D(); |
| 130 | |
| 131 | void reset(); |
| 132 | void update(); |
| 133 | void patchToMatrix(const SkPatch3D&, SkMatrix* matrix) const; |
| 134 | |
| 135 | SkPoint3D fLocation; |
| 136 | SkPoint3D fAxis; |
| 137 | SkPoint3D fZenith; |
| 138 | SkPoint3D fObserver; |
| 139 | |
| 140 | private: |
| 141 | mutable SkMatrix fOrientation; |
| 142 | mutable bool fNeedToUpdate; |
| 143 | |
| 144 | void doUpdate() const; |
| 145 | }; |
| 146 | |
| 147 | class Sk3DView : SkNoncopyable { |
| 148 | public: |
| 149 | Sk3DView(); |
| 150 | ~Sk3DView(); |
| 151 | |
| 152 | void save(); |
| 153 | void restore(); |
| 154 | |
| 155 | void translate(SkScalar x, SkScalar y, SkScalar z); |
| 156 | void rotateX(SkScalar deg); |
| 157 | void rotateY(SkScalar deg); |
| 158 | void rotateZ(SkScalar deg); |
| 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 | |