#if defined(GL_ES)
precision highp float;
#endif

attribute vec4 ig_Vertex;
attribute vec4 ig_MultiTexCoord0;

uniform float point_size;
uniform mat4 ig_ModelViewProjectionMatrix;

varying vec3 v_color;
varying float v_magnitude;
varying vec2 v_point_center;

void main() {
  v_color = ig_MultiTexCoord0.rgb;
  v_magnitude = ig_MultiTexCoord0.a;

  vec4 position = ig_ModelViewProjectionMatrix * ig_Vertex;
  gl_Position = position;

  // Store the projected center of the point to simulate gl_PointCoord.
  v_point_center = position.xy / position.w;
  gl_PointSize = point_size;
}