varying vec2 v_texCoord;
varying vec4 v_fragmentColor;

uniform vec3 u_outlineColor;
uniform float u_radius;

void main()
{
	float radius = u_radius;
	vec4 accum = vec4(0.0);
	vec4 normal = vec4(0.0);

	normal = texture2D(CC_Texture0, vec2(v_texCoord.x, v_texCoord.y));

	accum += texture2D(CC_Texture0, vec2(v_texCoord.x + radius, v_texCoord.y)); 
	accum += texture2D(CC_Texture0, vec2(v_texCoord.x - radius, v_texCoord.y)); 
	accum += texture2D(CC_Texture0, vec2(v_texCoord.x, v_texCoord.y + radius)); 
	accum += texture2D(CC_Texture0, vec2(v_texCoord.x, v_texCoord.y - radius)); 

	accum.rgb = u_outlineColor * accum.a;
	accum.a = 1;

	normal = (accum * (1.0 - normal.a)) + (normal * normal.a);

	gl_FragColor = v_fragmentColor * normal;
}