Antialiased burst from color stripes

burst.vsh

//Declare a 2D texture as a uniform variable
uniform sampler2D texture;

uniform float samples;


void main()
{
	vec2 poissonDisk[8];
	poissonDisk[0] = vec2(-0.613392, 0.617481);
	poissonDisk[1] = vec2(0.170019, -0.040254);
	poissonDisk[2] = vec2(-0.299417, 0.791925);
	poissonDisk[3] = vec2(0.645680, 0.493210);
	poissonDisk[4] = vec2(-0.651784, 0.717887);
	poissonDisk[5] = vec2(0.421003, 0.027070);
	poissonDisk[6] = vec2(-0.817194, -0.271096);
	poissonDisk[7] = vec2(-0.705374, -0.668203);

	const float PI2 = 3.1415926535 * 2.0;
	
	float dist = length(gl_TexCoord[0].xy * 2.0 - 1.0);

	int iterations = dist > 0.2 ? 1 : (dist > 0.05 ? 2 : 10);
	float iterations_inv = 1.0 / float(iterations);

	
	vec4 avg = vec4(0.0);
	if (iterations > 1) {
		for (int i=0; i<iterations; i++) {
			vec2 tc = gl_TexCoord[0].xy;
			tc += + 0.001*poissonDisk[i];
			tc *= 2.0;
			tc -= 1.0;
			tc = vec2(atan(tc.y, tc.x) / PI2, sqrt(tc.x * tc.x + tc.y * tc.y));
			
			avg += iterations_inv * texture2D(texture, tc );
		}
		gl_FragColor = gl_Color * avg;
	} else {
			vec2 tc = gl_TexCoord[0].xy;
			tc *= 2.0;
			tc -= 1.0;
			tc = vec2(atan(tc.y, tc.x) / PI2, sqrt(tc.x * tc.x + tc.y * tc.y));
			gl_FragColor = gl_Color * texture2D(texture, tc);
	}
	
}