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Viewing changes to Development/libraries/opengl/example/functions.h

  • Committer: Suren A. Chilingaryan
  • Date: 2009-04-09 03:21:08 UTC
  • Revision ID: csa@dside.dyndns.org-20090409032108-w4edamdh4adrgdu3
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Development/libraries/opengl/example/functions.h
 
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void delay(ms) {
 
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    struct timespec ts;
 
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    ts.tv_sec = ms / 1000;
 
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    ts.tv_nsec = (ms % 1000) * 1000000;
 
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    nanosleep(&ts, NULL);
 
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}
 
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void normalize(float *v) {    
 
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   GLfloat d = sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); 
 
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   if (d == 0.0) { puts("zero vector"); exit(1); }
 
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   v[0] /= d; v[1] /= d; v[2] /= d; 
 
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}
 
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void normcrossprod(float *v1, float *v2, float *out) 
 
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{ 
 
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   GLint i, j; 
 
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   GLfloat length;
 
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   out[0] = v1[1]*v2[2] - v1[2]*v2[1]; 
 
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   out[1] = v1[2]*v2[0] - v1[0]*v2[2]; 
 
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   out[2] = v1[0]*v2[1] - v1[1]*v2[0]; 
 
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   normalize(out); 
 
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}