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595 jab 1 
/* ----------------------------------------------------------------------- *
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 * This file is part of GEL, http://www.imm.dtu.dk/GEL
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 * Copyright (C) the authors and DTU Informatics
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 * For license and list of authors, see ../../doc/intro.pdf
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 * ----------------------------------------------------------------------- */
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#include "Mat4x4f.h"
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namespace CGLA
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{
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	Mat4x4f rotation_Mat4x4f(Axis axis, float angle)
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	{
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		Mat4x4f m(0.0f);
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		switch(axis)
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			{
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			case XAXIS:
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				m[0][0] = 1.0f;
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				m[1][1] = cos(angle);
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				m[1][2] = sin(angle);
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				m[2][1] = -sin(angle);
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				m[2][2] = cos(angle);
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				m[3][3] = 1.0f;
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				break;
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			case YAXIS:
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				m[0][0] = cos(angle);
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				m[0][2] = -sin(angle);
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				m[2][0] = sin(angle);
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				m[2][2] = cos(angle);
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				m[1][1] = 1.0f;
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				m[3][3] = 1.0f;
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				break;
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			case ZAXIS:
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				m[0][0] = cos(angle);
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				m[0][1] = sin(angle);
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				m[1][0] = -sin(angle);
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				m[1][1] = cos(angle);
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				m[2][2] = 1.0f;
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				m[3][3] = 1.0f;
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				break;
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			}
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		return m;
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	}
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	Mat4x4f translation_Mat4x4f(const Vec3f& v)
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	{
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		Mat4x4f m(0.0f);
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		m[0][0] = 1.0f;
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		m[1][1] = 1.0f;
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		m[2][2] = 1.0f;
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		m[3][3] = 1.0f;
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		m[0][3] = v[0];
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		m[1][3] = v[1];
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		m[2][3] = v[2];
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		return m;
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	}
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	Mat4x4f scaling_Mat4x4f(const Vec3f& v)
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	{
10 jab 64 
		Mat4x4f m(0.0f);
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		m[0][0] = v[0];
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		m[1][1] = v[1];
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		m[2][2] = v[2];
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		m[3][3] = 1.0f;
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		return m;
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	}
624 mono 73 
 
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    Mat4x4f perspective_Mat4x4f(float fovy, float aspect, float zNear, float zFar){
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        assert(zNear > 0);
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        assert(zFar > zNear);
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        assert(fovy > 0);
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        float top   = tan(fovy * DEGREES_TO_RADIANS/2) * zNear;
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        float right = top * aspect;
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        Mat4x4f c(0);
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        c[0][0] = zNear/right;
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        c[1][1] = zNear/top;
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        c[2][2] = -(zFar + zNear)/(zFar - zNear);
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        c[2][3] = -2.0*zFar*zNear/(zFar - zNear);
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        c[3][2] = -1.0;
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        c[3][3] = 0.0;
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        return c;
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    }
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    Mat4x4f frustum_Mat4x4f(float left, float right, float bottom, float top, float nearVal, float farVal){
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        assert(nearVal > 0);
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        assert(farVal > nearVal);
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        assert(right > left);
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        assert(top > bottom);
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        Mat4x4f c(0);
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        c[0][0] = 2.0 * nearVal / (right - left);
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        c[0][2] = (right + left) / (right - left);
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        c[1][1] = 2.0 * nearVal / (top - bottom);
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        c[1][2] = (top + bottom) / (top - bottom);
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        c[2][2] = -(farVal + nearVal) / (farVal - nearVal);
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        c[2][3] = -2.0 * farVal * nearVal / (farVal - nearVal);
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        c[3][2] = -1.0;
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        c[3][3] = 0.0;
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        return c;
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    }
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    Mat4x4f ortho_Mat4x4f(float left, float right, float bottom, float top, float nearVal, float farVal) {
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        assert(right > left);
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        assert(top > bottom);
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        assert(farVal > nearVal);
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        Mat4x4f c(0);
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        c[0][0] = 2.0/(right - left);
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        c[1][1] = 2.0/(top - bottom);
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        c[2][2] = 2.0/(nearVal - farVal);
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        c[3][3] = 1.0;
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        c[0][3] = -(right + left)/(right - left);
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        c[1][3] = -(top + bottom)/(top - bottom);
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        c[2][3] = -(farVal + nearVal)/(farVal - nearVal);
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        return c;
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    }
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    Mat4x4f ortho2D_Mat4x4f(float left, float right, float bottom, float top){
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        return ortho_Mat4x4f(left, right, bottom, top, -1, 1);
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    }
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    Mat4x4f lookAt_Mat4x4f(const Vec3f& eye, const Vec3f& at, const Vec3f& up){
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        Vec4f n = Vec4f(normalize(eye - at),0.0);
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132 
        Vec4f u = Vec4f(normalize(cross(up,Vec3f(n))),0.0);
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        Vec4f v = Vec4f(normalize(cross(Vec3f(n),Vec3f(u))),0.0);
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        Vec4f t = Vec4f(0.0, 0.0, 0.0, 1.0);
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        Mat4x4f c = Mat4x4f(u, v, n, t);
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        return c * translation_Mat4x4f( -eye );
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    }
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2 bj 139 
}