350 lines
9.5 KiB
C
350 lines
9.5 KiB
C
/*
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* Copyright 2011-2012 Branimir Karadzic. All rights reserved.
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* License: http://www.opensource.org/licenses/BSD-2-Clause
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*/
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// FPU math lib
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#ifndef __FPU_MATH_H__
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#define __FPU_MATH_H__
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#define _USE_MATH_DEFINES
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#include <math.h>
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#include <string.h>
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inline float fmin(float _a, float _b)
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{
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return _a < _b ? _a : _b;
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}
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inline float fmax(float _a, float _b)
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{
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return _a > _b ? _a : _b;
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}
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inline float flerp(float _a, float _b, float _t)
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{
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return _a + (_b - _a) * _t;
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}
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inline void vec3Add(float* __restrict _result, const float* __restrict _a, const float* __restrict _b)
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{
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_result[0] = _a[0] + _b[0];
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_result[1] = _a[1] + _b[1];
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_result[2] = _a[2] + _b[2];
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}
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inline void vec3Sub(float* __restrict _result, const float* __restrict _a, const float* __restrict _b)
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{
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_result[0] = _a[0] - _b[0];
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_result[1] = _a[1] - _b[1];
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_result[2] = _a[2] - _b[2];
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}
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inline void vec3Mul(float* __restrict _result, const float* __restrict _a, const float* __restrict _b)
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{
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_result[0] = _a[0] * _b[0];
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_result[1] = _a[1] * _b[1];
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_result[2] = _a[2] * _b[2];
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}
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inline void vec3Mul(float* __restrict _result, const float* __restrict _a, float _b)
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{
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_result[0] = _a[0] * _b;
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_result[1] = _a[1] * _b;
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_result[2] = _a[2] * _b;
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}
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inline float vec3Dot(const float* __restrict _a, const float* __restrict _b)
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{
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return _a[0]*_b[0] + _a[1]*_b[1] + _a[2]*_b[2];
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}
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inline void vec3Cross(float* __restrict _result, const float* __restrict _a, const float* __restrict _b)
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{
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_result[0] = _a[1]*_b[2] - _a[2]*_b[1];
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_result[1] = _a[2]*_b[0] - _a[0]*_b[2];
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_result[2] = _a[0]*_b[1] - _a[1]*_b[0];
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}
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inline void vec3Norm(float* __restrict _result, const float* __restrict _a)
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{
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float scale = 1.0f/sqrtf(vec3Dot(_a, _a) );
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_result[0] = _a[0] * scale;
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_result[1] = _a[1] * scale;
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_result[2] = _a[2] * scale;
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}
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inline void mtxIdentity(float* _result)
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{
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memset(_result, 0, sizeof(float)*16);
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_result[0] = _result[5] = _result[10] = _result[15] = 1.0f;
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}
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inline void mtxLookAt(float* __restrict _result, const float* __restrict _eye, const float* __restrict _at)
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{
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float tmp[4];
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vec3Sub(tmp, _at, _eye);
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float view[4];
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vec3Norm(view, tmp);
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float up[3] = { 0.0f, 1.0f, 0.0f };
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vec3Cross(tmp, up, view);
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float right[4];
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vec3Norm(right, tmp);
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vec3Cross(up, view, right);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = right[0];
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_result[ 1] = up[0];
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_result[ 2] = view[0];
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_result[ 4] = right[1];
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_result[ 5] = up[1];
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_result[ 6] = view[1];
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_result[ 8] = right[2];
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_result[ 9] = up[2];
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_result[10] = view[2];
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_result[12] = -vec3Dot(right, _eye);
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_result[13] = -vec3Dot(up, _eye);
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_result[14] = -vec3Dot(view, _eye);
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_result[15] = 1.0f;
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}
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inline void mtxProj(float* _result, float _fovy, float _aspect, float _near, float _far)
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{
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float height = 1.0f/tanf(_fovy*( (float)M_PI/180.0f)*0.5f);
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float width = height * 1.0f/_aspect;
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float aa = _far/(_far-_near);
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float bb = -_near * aa;
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memset(_result, 0, sizeof(float)*16);
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_result[0] = width;
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_result[5] = height;
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_result[10] = aa;
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_result[11] = 1.0f;
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_result[14] = bb;
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}
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inline void mtxOrtho(float* _result, float _left, float _right, float _bottom, float _top, float _near, float _far)
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{
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const float aa = 2.0f/(_right - _left);
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const float bb = 2.0f/(_top - _bottom);
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const float cc = 1.0f/(_far - _near);
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const float dd = (_left + _right)/(_left - _right);
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const float ee = (_top + _bottom)/(_bottom - _top);
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const float ff = _near / (_near - _far);
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memset(_result, 0, sizeof(float)*16);
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_result[0] = aa;
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_result[5] = bb;
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_result[10] = cc;
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_result[12] = dd;
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_result[13] = ee;
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_result[14] = ff;
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_result[15] = 1.0f;
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}
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inline void mtxRotateX(float* _result, float _ax)
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{
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float sx = sinf(_ax);
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float cx = cosf(_ax);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = 1.0f;
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_result[ 5] = cx;
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_result[ 6] = -sx;
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_result[ 9] = sx;
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_result[10] = cx;
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_result[15] = 1.0f;
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}
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inline void mtxRotateY(float* _result, float _ay)
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{
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float sy = sinf(_ay);
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float cy = cosf(_ay);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = cy;
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_result[ 2] = sy;
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_result[ 5] = 1.0f;
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_result[ 8] = -sy;
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_result[10] = cy;
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_result[15] = 1.0f;
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}
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inline void mtxRotateZ(float* _result, float _az)
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{
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float sz = sinf(_az);
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float cz = cosf(_az);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = cz;
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_result[ 1] = -sz;
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_result[ 4] = sz;
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_result[ 5] = cz;
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_result[10] = 1.0f;
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_result[15] = 1.0f;
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}
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inline void mtxRotateXY(float* _result, float _ax, float _ay)
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{
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float sx = sinf(_ax);
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float cx = cosf(_ax);
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float sy = sinf(_ay);
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float cy = cosf(_ay);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = cy;
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_result[ 2] = -sy;
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_result[ 4] = -sx*sy;
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_result[ 5] = cx;
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_result[ 6] = -sx*cy;
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_result[ 8] = cx*sy;
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_result[ 9] = sx;
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_result[10] = cx*cy;
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_result[15] = 1.0f;
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}
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inline void mtxRotateXYZ(float* _result, float _ax, float _ay, float _az)
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{
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float sx = sinf(_ax);
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float cx = cosf(_ax);
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float sy = sinf(_ay);
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float cy = cosf(_ay);
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float sz = sinf(_az);
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float cz = cosf(_az);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = cy*cz;
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_result[ 1] = -cy*sz;
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_result[ 2] = sy;
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_result[ 4] = cz*sx*sy + cx*sz;
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_result[ 5] = cx*cz - sx*sy*sz;
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_result[ 6] = -cy*sx;
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_result[ 8] = -cx*cz*sy + sx*sz;
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_result[ 9] = cz*sx + cx*sy*sz;
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_result[10] = cx*cy;
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_result[15] = 1.0f;
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}
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inline void mtxRotateZYX(float* _result, float _ax, float _ay, float _az)
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{
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float sx = sinf(_ax);
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float cx = cosf(_ax);
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float sy = sinf(_ay);
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float cy = cosf(_ay);
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float sz = sinf(_az);
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float cz = cosf(_az);
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memset(_result, 0, sizeof(float)*16);
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_result[ 0] = cy*cz;
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_result[ 1] = cz*sx*sy-cx*sz;
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_result[ 2] = cx*cz*sy+sx*sz;
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_result[ 4] = cy*sz;
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_result[ 5] = cx*cz + sx*sy*sz;
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_result[ 6] = -cz*sx + cx*sy*sz;
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_result[ 8] = -sy;
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_result[ 9] = cy*sx;
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_result[10] = cx*cy;
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_result[15] = 1.0f;
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};
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inline void vec3MulMtx(float* __restrict _result, const float* __restrict _vec, const float* __restrict _mat)
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{
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_result[0] = _vec[0] * _mat[ 0] + _vec[1] * _mat[4] + _vec[2] * _mat[ 8] + _mat[12];
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_result[1] = _vec[0] * _mat[ 1] + _vec[1] * _mat[5] + _vec[2] * _mat[ 9] + _mat[13];
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_result[2] = _vec[0] * _mat[ 2] + _vec[1] * _mat[6] + _vec[2] * _mat[10] + _mat[14];
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}
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inline void vec4MulMtx(float* __restrict _result, const float* __restrict _vec, const float* __restrict _mat)
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{
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_result[0] = _vec[0] * _mat[ 0] + _vec[1] * _mat[4] + _vec[2] * _mat[ 8] + _vec[3] * _mat[12];
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_result[1] = _vec[0] * _mat[ 1] + _vec[1] * _mat[5] + _vec[2] * _mat[ 9] + _vec[3] * _mat[13];
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_result[2] = _vec[0] * _mat[ 2] + _vec[1] * _mat[6] + _vec[2] * _mat[10] + _vec[3] * _mat[14];
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_result[3] = _vec[0] * _mat[ 3] + _vec[1] * _mat[7] + _vec[2] * _mat[11] + _vec[3] * _mat[15];
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}
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inline void mtxMul(float* __restrict _result, const float* __restrict _a, const float* __restrict _b)
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{
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vec4MulMtx(&_result[ 0], &_a[ 0], _b);
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vec4MulMtx(&_result[ 4], &_a[ 4], _b);
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vec4MulMtx(&_result[ 8], &_a[ 8], _b);
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vec4MulMtx(&_result[12], &_a[12], _b);
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}
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inline void mtxTranspose(float* __restrict _result, const float* __restrict _a)
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{
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_result[ 0] = _a[ 0];
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_result[ 4] = _a[ 1];
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_result[ 8] = _a[ 2];
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_result[12] = _a[ 3];
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_result[ 1] = _a[ 4];
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_result[ 5] = _a[ 5];
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_result[ 9] = _a[ 6];
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_result[13] = _a[ 7];
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_result[ 2] = _a[ 8];
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_result[ 6] = _a[ 9];
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_result[10] = _a[10];
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_result[14] = _a[11];
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_result[ 3] = _a[12];
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_result[ 7] = _a[13];
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_result[11] = _a[14];
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_result[15] = _a[15];
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}
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inline void mtxInverse(float* __restrict _result, const float* __restrict _a)
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{
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float xx = _a[ 0];
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float xy = _a[ 1];
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float xz = _a[ 2];
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float xw = _a[ 3];
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float yx = _a[ 4];
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float yy = _a[ 5];
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float yz = _a[ 6];
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float yw = _a[ 7];
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float zx = _a[ 8];
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float zy = _a[ 9];
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float zz = _a[10];
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float zw = _a[11];
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float wx = _a[12];
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float wy = _a[13];
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float wz = _a[14];
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float ww = _a[15];
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float det = 0.0f;
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det += xx * (yy*(zz*ww - zw*wz) - yz*(zy*ww - zw*wy) + yw*(zy*wz - zz*wy) );
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det -= xy * (yx*(zz*ww - zw*wz) - yz*(zx*ww - zw*wx) + yw*(zx*wz - zz*wx) );
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det += xz * (yx*(zy*ww - zw*wy) - yy*(zx*ww - zw*wx) + yw*(zx*wy - zy*wx) );
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det -= xw * (yx*(zy*wz - zz*wy) - yy*(zx*wz - zz*wx) + yz*(zx*wy - zy*wx) );
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float invDet = 1.0f/det;
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_result[ 0] = +(yy*(zz*ww - wz*zw) - yz*(zy*ww - wy*zw) + yw*(zy*wz - wy*zz) ) * invDet;
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_result[ 1] = -(xy*(zz*ww - wz*zw) - xz*(zy*ww - wy*zw) + xw*(zy*wz - wy*zz) ) * invDet;
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_result[ 2] = +(xy*(yz*ww - wz*yw) - xz*(yy*ww - wy*yw) + xw*(yy*wz - wy*yz) ) * invDet;
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_result[ 3] = -(xy*(yz*zw - zz*yw) - xz*(yy*zw - zy*yw) + xw*(yy*zz - zy*yz) ) * invDet;
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_result[ 4] = -(yx*(zz*ww - wz*zw) - yz*(zx*ww - wx*zw) + yw*(zx*wz - wx*zz) ) * invDet;
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_result[ 5] = +(xx*(zz*ww - wz*zw) - xz*(zx*ww - wx*zw) + xw*(zx*wz - wx*zz) ) * invDet;
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_result[ 6] = -(xx*(yz*ww - wz*yw) - xz*(yx*ww - wx*yw) + xw*(yx*wz - wx*yz) ) * invDet;
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_result[ 7] = +(xx*(yz*zw - zz*yw) - xz*(yx*zw - zx*yw) + xw*(yx*zz - zx*yz) ) * invDet;
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_result[ 8] = +(yx*(zy*ww - wy*zw) - yy*(zx*ww - wx*zw) + yw*(zx*wy - wx*zy) ) * invDet;
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_result[ 9] = -(xx*(zy*ww - wy*zw) - xy*(zx*ww - wx*zw) + xw*(zx*wy - wx*zy) ) * invDet;
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_result[10] = +(xx*(yy*ww - wy*yw) - xy*(yx*ww - wx*yw) + xw*(yx*wy - wx*yy) ) * invDet;
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_result[11] = -(xx*(yy*zw - zy*yw) - xy*(yx*zw - zx*yw) + xw*(yx*zy - zx*yy) ) * invDet;
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_result[12] = -(yx*(zy*wz - wy*zz) - yy*(zx*wz - wx*zz) + yz*(zx*wy - wx*zy) ) * invDet;
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_result[13] = +(xx*(zy*wz - wy*zz) - xy*(zx*wz - wx*zz) + xz*(zx*wy - wx*zy) ) * invDet;
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_result[14] = -(xx*(yy*wz - wy*yz) - xy*(yx*wz - wx*yz) + xz*(yx*wy - wx*yy) ) * invDet;
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_result[15] = +(xx*(yy*zz - zy*yz) - xy*(yx*zz - zx*yz) + xz*(yx*zy - zx*yy) ) * invDet;
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}
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#endif // __FPU_MATH_H__
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