subgraph_shaders.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Mon Aug  5 15:35:04 2019
@author: pavel
"""
#shaders for drawing supernodes
vert_s = """
#version 120
// Uniforms
// ------------------------------------
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
//uniform vec3 u_graph_size;
uniform bool u_picking;
// Attributes
// ------------------------------------
attribute vec3  a_position;
attribute vec4  a_bg_color;
attribute vec4  a_cluster_color;
attribute vec2  a_value;
attribute float a_arc_length;
attribute vec4 a_outer_arc_length;
attribute vec4 a_unique_id;
// Varyings
// ------------------------------------
varying vec4 v_bg_color;
varying vec4 v_cluster_color;
varying vec2 v_value;
varying float v_zoom_level;
varying float v_arc_length;
varying vec4 v_outer_arc_length;
varying vec4 v_unique_id;
void main (void) {
    v_value = a_value;
    v_bg_color = a_bg_color;
    v_cluster_color = a_cluster_color;
    gl_Position = u_projection * u_view * u_model *
        vec4(a_position, 1.0);
    v_zoom_level = u_view[0][0];
    v_arc_length = a_arc_length;
    v_outer_arc_length = a_outer_arc_length;
    v_unique_id = a_unique_id;
}
"""
frag_s = """
#version 120
const float pi = 3.1415926535897932384626433832795;
// Varyings
// ------------------------------------
varying vec4 v_bg_color;
varying vec2 v_value;
varying float v_zoom_level;
varying vec4 v_cluster_color;
varying float v_arc_length;
varying vec4 v_outer_arc_length;
varying vec4 v_unique_id;
uniform bool u_picking;
// Attributes
// ------------------------------------
// Functions
// ------------------------------------
float new_alpha(float zoom_level);
float atan2(float y, float x);
// Main
// ------------------------------------
void main()
{
    if(!u_picking)
    {
    //This is the color of the outer arc lengths
         float R = 0.55;
         float R2 = 0.3;
         float dist = sqrt(dot(v_value, v_value));
         float sm = smoothstep(R, R-0.0010, dist);
         float sm2 = smoothstep(R2, R2+0.0010, dist);
         float alpha = sm*sm2;
         float n_alpha = 1.0;
         if(v_zoom_level < 0.0010)
         {
              n_alpha = new_alpha(v_zoom_level);
         }
         else
         {
              discard;
         }
         float angle = atan(v_value[1], v_value[0]);
         if(dist < 0.25)
         {
              //gl_FragColor = v_cluster_color;
              gl_FragColor = vec4(v_cluster_color.rgb, n_alpha);
         }
         if(dist > 0.3 && 0.55 > dist)
         {
              float angle2 = angle+pi;
              if(angle2 > v_arc_length)
              {
                      discard;
              }
              else
              {
                      gl_FragColor = vec4(v_bg_color.rgb, n_alpha*alpha);
              }
         }
         angle = atan(v_value[1]/dist, v_value[0]/dist);
    //Need to add antialiasing to all other circles in the form of smoothstep.
    //THIS NEED TO BE FIXED
         if(dist > 0.61 && 0.9 > dist)
         {
              if(angle < v_outer_arc_length[1])
              {
                      gl_FragColor = vec4(0.32, 0.61, 0.93, n_alpha);
                      //gl_FragColor = vec4(1.0, 0.0, 0.0, n_alpha);
              }
              else if(angle > v_outer_arc_length[1] && angle < v_outer_arc_length[2])
              {
                      gl_FragColor = vec4(0.337, 0.866, 0.415, n_alpha);
                      //gl_FragColor = vec4(0.0, 1.0, 0.0, n_alpha);
              }
              else if(angle > v_outer_arc_length[2] && angle < v_outer_arc_length[3])
              {
                      gl_FragColor = vec4(0.988, 0.631, 0.058, n_alpha);
                      //gl_FragColor = vec4(0.0, 0.0, 1.0, n_alpha);
              }
              else //if(angle > v_outer_arc_length[3] && angle < pi)
              {
                      gl_FragColor = vec4(0.93, 0.949, 0.329, n_alpha);
                      //gl_FragColor = vec4(1.0, 1.0, 0.0, n_alpha);
              }
              //else
              //{
              //        discard;
              //}
//              if(angle > -pi && angle < -pi/4.0)
//              {
//                    //gl_FragColor = vec4(0.32, 0.61, 0.93, n_alpha);
//                      gl_FragColor = vec4(1.0, 0.0, 0.0, n_alpha);
//              }
//              else if(angle > -pi/4.0 && angle < 0.0)
//              {
//                  gl_FragColor = vec4(0.0, 1.0, 0.0, n_alpha);
//              }
//              else if(angle > 0.0 && angle < pi/2.0)
//              {
//                  gl_FragColor = vec4(0.0, 0.0, 1.0, n_alpha);
//              }
//              else if(angle > pi/2.0 && angle < pi)
//              {
//                  gl_FragColor = vec4(1.0, 1.0, 0.0, n_alpha);
//              }
         }
    }
    else
    {
         float dist = sqrt(dot(v_value, v_value));
         if (dist > 0.9)
             discard;
         else
             gl_FragColor = v_unique_id;
    }
}
float atan2(float y, float x)
{
     float s;
     if(abs(x) > abs(y))
         s = 1.0;
     else
        s = 0.0;
     return (mix(pi/2.0 - atan(x,y), atan(y,x), s));
}
//float atan2(in float y, in float x)
//{
//    return x == 0.0 ? sign(y)*pi/2 : atan(y, x);
//}
float new_alpha(float zoom_level)
{
    float val = 1 - (zoom_level - 0.00075)/(0.0010-0.00075);
    if(val > 1.0)
    {
        val = 1.0;
    }
    return val;
}
"""
vs_s = """
#version 120
// Uniforms
// ------------------------------------
uniform mat4 u_model;
uniform mat4 u_view;
uniform mat4 u_projection;
// Attributes
// ------------------------------------
attribute vec3 a_position;
attribute vec2 a_normal;
attribute vec4 a_fg_color;
attribute float a_linewidth;
// Varyings
// ------------------------------------
varying vec4 v_fg_color;
varying float v_zoom_level;
varying vec2 v_normal;
varying float v_linewidth;
void main() {
    vec3 delta = vec3(a_normal*a_linewidth/((1-u_view[0][0])*0.1), 0);
    //vec3 delta = vec3(a_normal*a_linewidth/(1-u_view[0][0]), 0);
    gl_Position = u_model * u_view * u_projection * vec4(a_position+delta, 1.0);
    //gl_Position = u_projection * u_view * u_model *
    //    vec4(a_position, 1.0);
    v_zoom_level = u_view[0][0];
    v_fg_color = a_fg_color;
    v_normal = a_normal;
    v_linewidth = a_linewidth;
}
"""
fs_s = """
#version 120
// Varying
// ------------------------------------
varying vec4 v_fg_color;
varying float v_zoom_level;
varying vec2 v_normal;
varying float v_linewidth;
float new_alpha(float zoom_level);
void main()
{
      float l = length(v_normal);
      float feather = 0.5;
      float alpha = 1.0;
      if(l > v_linewidth/2.0+feather)
          discard;
      else
          alpha = 0.0;
      if(v_zoom_level < 0.0010)
            alpha = new_alpha(v_zoom_level);
      gl_FragColor = vec4(v_fg_color.rgb, alpha);
}
float new_alpha(float zoom_level)
{
    float val = 1 - (zoom_level - 0.00075)/(0.0010-0.00075);
    if(val > 1.0)
    {
        val = 1.0;
    }
    return val;
}
"""