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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Inspired by Rob Johnson's most excellent QuickDraw GX sample code
#ifndef SkCamera_DEFINED
#define SkCamera_DEFINED
#include "Sk64.h"
#include "SkMatrix.h"
class SkCanvas;
#ifdef SK_SCALAR_IS_FIXED
typedef SkFract SkUnitScalar;
#define SK_UnitScalar1 SK_Fract1
#define SkUnitScalarMul(a, b) SkFractMul(a, b)
#define SkUnitScalarDiv(a, b) SkFractDiv(a, b)
#else
typedef float SkUnitScalar;
#define SK_UnitScalar1 SK_Scalar1
#define SkUnitScalarMul(a, b) SkScalarMul(a, b)
#define SkUnitScalarDiv(a, b) SkScalarDiv(a, b)
#endif
struct SkUnit3D {
SkUnitScalar fX, fY, fZ;
void set(SkUnitScalar x, SkUnitScalar y, SkUnitScalar z)
{
fX = x; fY = y; fZ = z;
}
static SkUnitScalar Dot(const SkUnit3D&, const SkUnit3D&);
static void Cross(const SkUnit3D&, const SkUnit3D&, SkUnit3D* cross);
};
struct SkPoint3D {
SkScalar fX, fY, fZ;
void set(SkScalar x, SkScalar y, SkScalar z)
{
fX = x; fY = y; fZ = z;
}
SkScalar normalize(SkUnit3D*) const;
};
typedef SkPoint3D SkVector3D;
struct SkMatrix3D {
SkScalar fMat[3][4];
void reset();
void setRow(int row, SkScalar a, SkScalar b, SkScalar c, SkScalar d = 0)
{
SkASSERT((unsigned)row < 3);
fMat[row][0] = a;
fMat[row][1] = b;
fMat[row][2] = c;
fMat[row][3] = d;
}
void setRotateX(SkScalar deg);
void setRotateY(SkScalar deg);
void setRotateZ(SkScalar deg);
void setTranslate(SkScalar x, SkScalar y, SkScalar z);
void preRotateX(SkScalar deg);
void preRotateY(SkScalar deg);
void preRotateZ(SkScalar deg);
void preTranslate(SkScalar x, SkScalar y, SkScalar z);
void setConcat(const SkMatrix3D& a, const SkMatrix3D& b);
void mapPoint(const SkPoint3D& src, SkPoint3D* dst) const;
void mapVector(const SkVector3D& src, SkVector3D* dst) const;
void mapPoint(SkPoint3D* v) const
{
this->mapPoint(*v, v);
}
void mapVector(SkVector3D* v) const
{
this->mapVector(*v, v);
}
};
class SkPatch3D {
public:
SkPatch3D();
void reset();
void transform(const SkMatrix3D&, SkPatch3D* dst = NULL) const;
// dot a unit vector with the patch's normal
SkScalar dotWith(SkScalar dx, SkScalar dy, SkScalar dz) const;
SkScalar dotWith(const SkVector3D& v) const
{
return this->dotWith(v.fX, v.fY, v.fZ);
}
// depreicated, but still here for animator (for now)
void rotate(SkScalar x, SkScalar y, SkScalar z) {}
void rotateDegrees(SkScalar x, SkScalar y, SkScalar z) {}
private:
public: // make public for SkDraw3D for now
SkVector3D fU, fV;
SkPoint3D fOrigin;
friend class SkCamera3D;
};
class SkCamera3D {
public:
SkCamera3D();
void reset();
void update();
void patchToMatrix(const SkPatch3D&, SkMatrix* matrix) const;
SkPoint3D fLocation;
SkPoint3D fAxis;
SkPoint3D fZenith;
SkPoint3D fObserver;
private:
mutable SkMatrix fOrientation;
mutable bool fNeedToUpdate;
void doUpdate() const;
};
class Sk3DView : SkNoncopyable {
public:
Sk3DView();
~Sk3DView();
void save();
void restore();
void translate(SkScalar x, SkScalar y, SkScalar z);
void rotateX(SkScalar deg);
void rotateY(SkScalar deg);
void rotateZ(SkScalar deg);
void getMatrix(SkMatrix*) const;
void applyToCanvas(SkCanvas*) const;
SkScalar dotWithNormal(SkScalar dx, SkScalar dy, SkScalar dz) const;
private:
struct Rec {
Rec* fNext;
SkMatrix3D fMatrix;
};
Rec* fRec;
Rec fInitialRec;
SkCamera3D fCamera;
};
#endif
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