68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
// Copyright (C) 2011 Valeriano Alfonso Rodriguez (Kableado)
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#ifndef _UTIL_H_
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#define _UTIL_H_
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/////////////////////////////
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// SolveQuadratic
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//
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// Solves a Quadratic equation using a, b and c coeficients.
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int SolveQuadratic(float a,float b,float c,float *Rmin,float *Rmax);
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////////////////////////////////////////////////
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// vec2 //
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//////////
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// A 2D vector.
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typedef float vec2[2];
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#define vec2_set(v,x,y) (v)[0]=(x);(v)[1]=(y);
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#define vec2_copy(v1,v2) (v1)[0]=(v2)[0];(v1)[1]=(v2)[1];
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#define vec2_plus(v,v1,v2) (v)[0]=(v1)[0]+(v2)[0];(v)[1]=(v1)[1]+(v2)[1];
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#define vec2_minus(v,v1,v2) (v)[0]=(v1)[0]-(v2)[0];(v)[1]=(v1)[1]-(v2)[1];
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#define vec2_scale(v,v1,s) (v)[0]=(v1)[0]*(s);(v)[1]=(v1)[1]*(s);
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#define vec2_dot(v1,v2) ((v1)[0]*(v2)[0]+(v1)[1]*(v2)[1])
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#define vec2_len(v) sqrtf((v)[0]*(v)[0]+(v)[1]*(v)[1])
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#define vec2_perp(v,n) (v)[0]=-(n)[1];(v)[1]=(n)[0];
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#define vec2_scaleadd(v,v1,v2,s) (v)[0]=(v2)[0]*(s)+(v1)[0];(v)[1]=(v2)[1]*(s)+(v1)[1];
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float vec2_norm(vec2 v);
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#define vec2_interpol(v,v1,v2,f) \
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(v)[0]=(v1)[0]-f*((v1)[0]-(v2)[0]);\
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(v)[1]=(v1)[1]-f*((v1)[1]-(v2)[1]);
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/////////////////////////////
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// Intersec_RayUnitCircle
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//
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// Intersection between a ray and a Unit Circle.
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int Intersec_RayUnitCircle(vec2 orig,vec2 vel,vec2 center,float *t);
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/////////////////////////////
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// Intersect_CircleCircle
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//
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// Colision point of a circle against another circle.
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int Colision_CircleCircle(
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vec2 cir1,float ra,vec2 vel,
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vec2 cb,float rb,
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float *t,vec2 n);
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/////////////////////////////
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// Intersect_RayEdge
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//
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// Intersection between a ray and a edge.
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int Intersect_RayEdge(
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vec2 pos,vec2 vel,
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vec2 norm,vec2 edgePos,float len,
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float *t);
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/////////////////////////////
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// absmod
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//
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int absmod(int v,int d);
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float fabsmod(float v,int d);
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#endif
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