round_explosion.vert

attribute float a_distance;
attribute float a_angle;
attribute vec4 a_mycolor;
varying vec4 v_Color;
uniform mat4 world; 
uniform vec4 u_position;
uniform float u_time;
uniform float u_size;
uniform float u_opacity;

void main()
{                            
   v_Color=a_mycolor;
   v_Color.a*=u_opacity;
   v_Color.g=sin(u_time*10.0f);
   v_Color.b=sin(u_time*10.0f);
   vec4 a_position=u_position;
   float d=a_distance*u_time/1.0f; //(1.0f+sin(u_time+a_distance+a_angle)*0.1f)*a_distance;
   vec4 delta=vec4(sin(a_angle),cos(a_angle),0,0)*d*u_size;
   a_position+=delta;
   gl_Position=world*a_position;
}