michael@0: /*
michael@0:  * Copyright 2006 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: //  Inspired by Rob Johnson's most excellent QuickDraw GX sample code
michael@0: 
michael@0: #ifndef SkCamera_DEFINED
michael@0: #define SkCamera_DEFINED
michael@0: 
michael@0: #include "SkMatrix.h"
michael@0: 
michael@0: class SkCanvas;
michael@0: 
michael@0: struct SkUnit3D {
michael@0:     SkScalar fX, fY, fZ;
michael@0: 
michael@0:     void set(SkScalar x, SkScalar y, SkScalar z) {
michael@0:         fX = x; fY = y; fZ = z;
michael@0:     }
michael@0:     static SkScalar Dot(const SkUnit3D&, const SkUnit3D&);
michael@0:     static void Cross(const SkUnit3D&, const SkUnit3D&, SkUnit3D* cross);
michael@0: };
michael@0: 
michael@0: struct SkPoint3D {
michael@0:     SkScalar    fX, fY, fZ;
michael@0: 
michael@0:     void set(SkScalar x, SkScalar y, SkScalar z) {
michael@0:         fX = x; fY = y; fZ = z;
michael@0:     }
michael@0:     SkScalar    normalize(SkUnit3D*) const;
michael@0: };
michael@0: typedef SkPoint3D SkVector3D;
michael@0: 
michael@0: struct SkMatrix3D {
michael@0:     SkScalar    fMat[3][4];
michael@0: 
michael@0:     void reset();
michael@0: 
michael@0:     void setRow(int row, SkScalar a, SkScalar b, SkScalar c, SkScalar d = 0) {
michael@0:         SkASSERT((unsigned)row < 3);
michael@0:         fMat[row][0] = a;
michael@0:         fMat[row][1] = b;
michael@0:         fMat[row][2] = c;
michael@0:         fMat[row][3] = d;
michael@0:     }
michael@0: 
michael@0:     void setRotateX(SkScalar deg);
michael@0:     void setRotateY(SkScalar deg);
michael@0:     void setRotateZ(SkScalar deg);
michael@0:     void setTranslate(SkScalar x, SkScalar y, SkScalar z);
michael@0: 
michael@0:     void preRotateX(SkScalar deg);
michael@0:     void preRotateY(SkScalar deg);
michael@0:     void preRotateZ(SkScalar deg);
michael@0:     void preTranslate(SkScalar x, SkScalar y, SkScalar z);
michael@0: 
michael@0:     void setConcat(const SkMatrix3D& a, const SkMatrix3D& b);
michael@0:     void mapPoint(const SkPoint3D& src, SkPoint3D* dst) const;
michael@0:     void mapVector(const SkVector3D& src, SkVector3D* dst) const;
michael@0: 
michael@0:     void mapPoint(SkPoint3D* v) const {
michael@0:         this->mapPoint(*v, v);
michael@0:     }
michael@0: 
michael@0:     void mapVector(SkVector3D* v) const {
michael@0:         this->mapVector(*v, v);
michael@0:     }
michael@0: };
michael@0: 
michael@0: class SkPatch3D {
michael@0: public:
michael@0:     SkPatch3D();
michael@0: 
michael@0:     void    reset();
michael@0:     void    transform(const SkMatrix3D&, SkPatch3D* dst = NULL) const;
michael@0: 
michael@0:     // dot a unit vector with the patch's normal
michael@0:     SkScalar dotWith(SkScalar dx, SkScalar dy, SkScalar dz) const;
michael@0:     SkScalar dotWith(const SkVector3D& v) const {
michael@0:         return this->dotWith(v.fX, v.fY, v.fZ);
michael@0:     }
michael@0: 
michael@0:     // deprecated, but still here for animator (for now)
michael@0:     void rotate(SkScalar x, SkScalar y, SkScalar z) {}
michael@0:     void rotateDegrees(SkScalar x, SkScalar y, SkScalar z) {}
michael@0: 
michael@0: private:
michael@0: public: // make public for SkDraw3D for now
michael@0:     SkVector3D  fU, fV;
michael@0:     SkPoint3D   fOrigin;
michael@0: 
michael@0:     friend class SkCamera3D;
michael@0: };
michael@0: 
michael@0: class SkCamera3D {
michael@0: public:
michael@0:     SkCamera3D();
michael@0: 
michael@0:     void reset();
michael@0:     void update();
michael@0:     void patchToMatrix(const SkPatch3D&, SkMatrix* matrix) const;
michael@0: 
michael@0:     SkPoint3D   fLocation;
michael@0:     SkPoint3D   fAxis;
michael@0:     SkPoint3D   fZenith;
michael@0:     SkPoint3D   fObserver;
michael@0: 
michael@0: private:
michael@0:     mutable SkMatrix    fOrientation;
michael@0:     mutable bool        fNeedToUpdate;
michael@0: 
michael@0:     void doUpdate() const;
michael@0: };
michael@0: 
michael@0: class Sk3DView : SkNoncopyable {
michael@0: public:
michael@0:     Sk3DView();
michael@0:     ~Sk3DView();
michael@0: 
michael@0:     void save();
michael@0:     void restore();
michael@0: 
michael@0:     void translate(SkScalar x, SkScalar y, SkScalar z);
michael@0:     void rotateX(SkScalar deg);
michael@0:     void rotateY(SkScalar deg);
michael@0:     void rotateZ(SkScalar deg);
michael@0: 
michael@0: #ifdef SK_BUILD_FOR_ANDROID
michael@0:     void setCameraLocation(SkScalar x, SkScalar y, SkScalar z);
michael@0:     SkScalar getCameraLocationX();
michael@0:     SkScalar getCameraLocationY();
michael@0:     SkScalar getCameraLocationZ();
michael@0: #endif
michael@0: 
michael@0:     void getMatrix(SkMatrix*) const;
michael@0:     void applyToCanvas(SkCanvas*) const;
michael@0: 
michael@0:     SkScalar dotWithNormal(SkScalar dx, SkScalar dy, SkScalar dz) const;
michael@0: 
michael@0: private:
michael@0:     struct Rec {
michael@0:         Rec*        fNext;
michael@0:         SkMatrix3D  fMatrix;
michael@0:     };
michael@0:     Rec*        fRec;
michael@0:     Rec         fInitialRec;
michael@0:     SkCamera3D  fCamera;
michael@0: };
michael@0: 
michael@0: #endif