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Diffstat (limited to 'contrib/Opcode/Ice/IcePoint.cpp')
| -rw-r--r-- | contrib/Opcode/Ice/IcePoint.cpp | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/contrib/Opcode/Ice/IcePoint.cpp b/contrib/Opcode/Ice/IcePoint.cpp new file mode 100644 index 0000000..616b08c --- /dev/null +++ b/contrib/Opcode/Ice/IcePoint.cpp @@ -0,0 +1,193 @@ +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/** + * Contains code for 3D vectors. + * \file IcePoint.cpp + * \author Pierre Terdiman + * \date April, 4, 2000 + */ +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/** + * 3D point. + * + * The name is "Point" instead of "Vector" since a vector is N-dimensional, whereas a point is an implicit "vector of dimension 3". + * So the choice was between "Point" and "Vector3", the first one looked better (IMHO). + * + * Some people, then, use a typedef to handle both points & vectors using the same class: typedef Point Vector3; + * This is bad since it opens the door to a lot of confusion while reading the code. I know it may sounds weird but check this out: + * + * \code + * Point P0,P1 = some 3D points; + * Point Delta = P1 - P0; + * \endcode + * + * This compiles fine, although you should have written: + * + * \code + * Point P0,P1 = some 3D points; + * Vector3 Delta = P1 - P0; + * \endcode + * + * Subtle things like this are not caught at compile-time, and when you find one in the code, you never know whether it's a mistake + * from the author or something you don't get. + * + * One way to handle it at compile-time would be to use different classes for Point & Vector3, only overloading operator "-" for vectors. + * But then, you get a lot of redundant code in thoses classes, and basically it's really a lot of useless work. + * + * Another way would be to use homogeneous points: w=1 for points, w=0 for vectors. That's why the HPoint class exists. Now, to store + * your model's vertices and in most cases, you really want to use Points to save ram. + * + * \class Point + * \author Pierre Terdiman + * \version 1.0 + */ +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Precompiled Header +#include "StdAfx.h" + +using namespace IceMaths; + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/** + * Creates a positive unit random vector. + * \return Self-reference + */ +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +IcePoint& IcePoint::PositiveUnitRandomVector() +{ + x = UnitRandomFloat(); + y = UnitRandomFloat(); + z = UnitRandomFloat(); + Normalize(); + return *this; +} + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/** + * Creates a unit random vector. + * \return Self-reference + */ +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +IcePoint& IcePoint::UnitRandomVector() +{ + x = UnitRandomFloat() - 0.5f; + y = UnitRandomFloat() - 0.5f; + z = UnitRandomFloat() - 0.5f; + Normalize(); + return *this; +} + +// Cast operator +// WARNING: not inlined +IcePoint::operator HPoint() const { return HPoint(x, y, z, 0.0f); } + +IcePoint& IcePoint::Refract(const IcePoint& eye, const IcePoint& n, float refractindex, IcePoint& refracted) +{ + // IcePoint EyePt = eye position + // IcePoint p = current vertex + // IcePoint n = vertex normal + // IcePoint rv = refracted vector + // Eye vector - doesn't need to be normalized + IcePoint Env; + Env.x = eye.x - x; + Env.y = eye.y - y; + Env.z = eye.z - z; + + float NDotE = n|Env; + float NDotN = n|n; + NDotE /= refractindex; + + // Refracted vector + refracted = n*NDotE - Env*NDotN; + + return *this; +} + +IcePoint& IcePoint::ProjectToPlane(const IcePlane& p) +{ + *this-= (p.d + (*this|p.n))*p.n; + return *this; +} + +void IcePoint::ProjectToScreen(float halfrenderwidth, float halfrenderheight, const Matrix4x4& mat, HPoint& projected) const +{ + projected = HPoint(x, y, z, 1.0f) * mat; + projected.w = 1.0f / projected.w; + + projected.x*=projected.w; + projected.y*=projected.w; + projected.z*=projected.w; + + projected.x *= halfrenderwidth; projected.x += halfrenderwidth; + projected.y *= -halfrenderheight; projected.y += halfrenderheight; +} + +void IcePoint::SetNotUsed() +{ + // We use a particular integer pattern : 0xffffffff everywhere. This is a NAN. + IR(x) = 0xffffffff; + IR(y) = 0xffffffff; + IR(z) = 0xffffffff; +} + +BOOL IcePoint::IsNotUsed() const +{ + if(IR(x)!=0xffffffff) return FALSE; + if(IR(y)!=0xffffffff) return FALSE; + if(IR(z)!=0xffffffff) return FALSE; + return TRUE; +} + +IcePoint& IcePoint::Mult(const Matrix3x3& mat, const IcePoint& a) +{ + x = a.x * mat.m[0][0] + a.y * mat.m[0][1] + a.z * mat.m[0][2]; + y = a.x * mat.m[1][0] + a.y * mat.m[1][1] + a.z * mat.m[1][2]; + z = a.x * mat.m[2][0] + a.y * mat.m[2][1] + a.z * mat.m[2][2]; + return *this; +} + +IcePoint& IcePoint::Mult2(const Matrix3x3& mat1, const IcePoint& a1, const Matrix3x3& mat2, const IcePoint& a2) +{ + x = a1.x * mat1.m[0][0] + a1.y * mat1.m[0][1] + a1.z * mat1.m[0][2] + a2.x * mat2.m[0][0] + a2.y * mat2.m[0][1] + a2.z * mat2.m[0][2]; + y = a1.x * mat1.m[1][0] + a1.y * mat1.m[1][1] + a1.z * mat1.m[1][2] + a2.x * mat2.m[1][0] + a2.y * mat2.m[1][1] + a2.z * mat2.m[1][2]; + z = a1.x * mat1.m[2][0] + a1.y * mat1.m[2][1] + a1.z * mat1.m[2][2] + a2.x * mat2.m[2][0] + a2.y * mat2.m[2][1] + a2.z * mat2.m[2][2]; + return *this; +} + +IcePoint& IcePoint::Mac(const Matrix3x3& mat, const IcePoint& a) +{ + x += a.x * mat.m[0][0] + a.y * mat.m[0][1] + a.z * mat.m[0][2]; + y += a.x * mat.m[1][0] + a.y * mat.m[1][1] + a.z * mat.m[1][2]; + z += a.x * mat.m[2][0] + a.y * mat.m[2][1] + a.z * mat.m[2][2]; + return *this; +} + +IcePoint& IcePoint::TransMult(const Matrix3x3& mat, const IcePoint& a) +{ + x = a.x * mat.m[0][0] + a.y * mat.m[1][0] + a.z * mat.m[2][0]; + y = a.x * mat.m[0][1] + a.y * mat.m[1][1] + a.z * mat.m[2][1]; + z = a.x * mat.m[0][2] + a.y * mat.m[1][2] + a.z * mat.m[2][2]; + return *this; +} + +IcePoint& IcePoint::Transform(const IcePoint& r, const Matrix3x3& rotpos, const IcePoint& linpos) +{ + x = r.x * rotpos.m[0][0] + r.y * rotpos.m[0][1] + r.z * rotpos.m[0][2] + linpos.x; + y = r.x * rotpos.m[1][0] + r.y * rotpos.m[1][1] + r.z * rotpos.m[1][2] + linpos.y; + z = r.x * rotpos.m[2][0] + r.y * rotpos.m[2][1] + r.z * rotpos.m[2][2] + linpos.z; + return *this; +} + +IcePoint& IcePoint::InvTransform(const IcePoint& r, const Matrix3x3& rotpos, const IcePoint& linpos) +{ + float sx = r.x - linpos.x; + float sy = r.y - linpos.y; + float sz = r.z - linpos.z; + x = sx * rotpos.m[0][0] + sy * rotpos.m[1][0] + sz * rotpos.m[2][0]; + y = sx * rotpos.m[0][1] + sy * rotpos.m[1][1] + sz * rotpos.m[2][1]; + z = sx * rotpos.m[0][2] + sy * rotpos.m[1][2] + sz * rotpos.m[2][2]; + return *this; +} |