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Revision 7c227ed2

Added by Leszek Koltunski almost 8 years ago

Bugfix in vertex shader (vertices were shot into outer space if P==S, i.e. if center point was exactly equal to the vertex being computed)

View differences:

src/main/res/raw/main_vertex_shader.glsl
97 97 
  vec2 PO  = PS + region.xy;
98 98 
  float D = region.z*region.z-dot(PO,PO);      // D = |OX|^2 - |PO|^2
99 99 
  float ps_sq = dot(PS,PS);
100 
  float DOT  = dot(PS,PO)/ps_sq;
100 
  float one_over_ps_sq = 1.0/(ps_sq+1.0-sign(ps_sq));  // return 1.0 if ps_sq = 0.0
101 
  float DOT  = dot(PS,PO)*one_over_ps_sq;
101 102 

  		




  102
  
  
    
  return max(sign(D),0.0) / (1.0 + 1.0/(sqrt(DOT*DOT+D/ps_sq)-DOT));  // if D<=0 (i.e p is outside the Region) return 0.


  		




  
  103
  
    
  return max(sign(D),0.0) / (1.0 + 1.0/(sqrt(DOT*DOT+D*one_over_ps_sq)-DOT));  // if D<=0 (i.e p is outside the Region) return 0.


  		




  103
  104
  
    
  }


  		




  104
  105
  
    

  		




  105
  106
  
    
//////////////////////////////////////////////////////////////////////////////////////////////


  		




  ......




  113
  114
  
    
  float B = sign(A.x*A.y);


  		




  114
  115
  
    
  float E = B*B*(1.0 + min(-PS.x/A.x,-PS.y/A.y));


  		




  115
  116
  
    
  float ps_sq = dot(PS,PS);


  		




  116
  
  
    
  float DOT  = dot(PS,PO)/ps_sq;


  		




  
  117
  
    
  float one_over_ps_sq = 1.0/(ps_sq+1.0-sign(ps_sq));  // return 1.0 if ps_sq = 0.0


  		




  
  118
  
    
  float DOT  = dot(PS,PO)*one_over_ps_sq;


  		




  117
  119
  
    

  		




  118
  
  
    
  return max(sign(D),0.0) * min(1.0/(1.0 + 1.0/(sqrt(DOT*DOT+D/ps_sq)-DOT)),E);  // if D<=0 (i.e p is outside the Region) return 0.


  		




  
  120
  
    
  return max(sign(D),0.0) * min(1.0/(1.0 + 1.0/(sqrt(DOT*DOT+D*one_over_ps_sq)-DOT)),E);  // if D<=0 (i.e p is outside the Region) return 0.


  		




  119
  121
  
    
  }


  		




  120
  122
  
    

  		




  121
  123
  
    
//////////////////////////////////////////////////////////////////////////////////////////////


  		












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