inc/opengl/theshader.geom


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#version 320 es
layout(points) in;
layout(triangle_strip, max_vertices = 64) out;

in highp vec3 vColor[];
in highp float vSides[];
out highp vec3 fColor;

const float PI = 3.1415926;

void main()
{
  fColor = vColor[0];

  for (float i = 0.0; i <= vSides[0]; i+=1.0) {	        // Angle between each side in radians
    float ang = PI * 2.0 / vSides[0] * i;
    // Offset from center of point (0.3 to accomodate for aspect ratio)
    vec4 offset = vec4(cos(ang) * 0.3, -sin(ang) * 0.4, 0.0, 0.0);
    gl_Position = gl_in[0].gl_Position - offset;

    EmitVertex();
  }
  EndPrimitive();
}