Warning, /eic-opticks/sysrap/gl/rec_flying_point_persist/geom.glsl is written in an unsupported language. File is not indexed.
0001 #version 410 core
0002
0003 uniform mat4 ModelViewProjection ;
0004 uniform vec4 Param ;
0005 //uniform vec4 post_center ;
0006 //uniform vec4 post_extent ;
0007
0008 layout (lines) in;
0009 layout (points, max_vertices = 1) out;
0010
0011 out vec4 fcolor ;
0012
0013 #define PERSIST 1
0014 // * With PERSIST defined the old rings remain visible after time has gone by
0015 // * Without PERSIST get the traditional flying point visualization
0016
0017 void main ()
0018 {
0019 //vec4 p0 = gl_in[0].gl_Position*post_extent + post_center ;
0020 //vec4 p1 = gl_in[1].gl_Position*post_extent + post_center ;
0021 // HMM: this scaling only needed if the record array were
0022 // scaled into ce already : which it is not
0023
0024 vec4 p0 = gl_in[0].gl_Position ;
0025 vec4 p1 = gl_in[1].gl_Position ;
0026 // two consequtive record positions with propagation times in .w
0027
0028 float tc = Param.w ;
0029
0030 uint valid = (uint(p0.w > 0.) << 0) + (uint(p1.w > 0.) << 1) + (uint(p1.w > p0.w) << 2) ;
0031 // valid : times > 0. and ordered correctly (no consideration of tc, input time Param.w)
0032 // permitting zero causes "future kink" issue
0033
0034 uint select = (uint(tc > p0.w ) << 0) + (uint(tc < p1.w) << 1) + (0x1 << 2 ) ;
0035 // select : input time Param tc is between the two point times
0036
0037 uint valid_select = valid & select ;
0038 // bitwise combination
0039
0040 fcolor = vec4(1.0,1.0,1.0,1.0) ; ;
0041
0042 if(valid_select == 0x7) // both points valid and with tc inbetween the points, so can mix to get position
0043 {
0044 vec3 pt = mix( vec3(p0), vec3(p1), (tc - p0.w)/(p1.w - p0.w) );
0045 gl_Position = ModelViewProjection * vec4( pt, 1.0 ) ;
0046 gl_PointSize = 1. ;
0047 EmitVertex();
0048 EndPrimitive();
0049 }
0050 #ifdef PERSIST
0051 else if( valid == 0x7 && select == 0x5 ) // both points valid, but time is beyond them both
0052 {
0053 vec3 pt = vec3(p1) ;
0054 gl_Position = ModelViewProjection * vec4( pt, 1.0 ) ;
0055 gl_PointSize = 1. ;
0056 EmitVertex();
0057 EndPrimitive();
0058 }
0059 #endif
0060 }
0061
0062
