point light shader

gistfile1.txt

- (NSString *)getFragmentShaderString
{
    NSString *const kFragmentShaderString = SHADER_STRING
    (
     varying highp vec2 textureCoordinate;

     uniform sampler2D inputImageTexture;

     void main()
     {
         highp vec2 position = textureCoordinate.xy;

         highp float color = 0.0;

         highp float mBlobX = 0.5 + sin(0.01) * 0.5;

         color += (1.0 / distance(position,vec2(mBlobX, 0.5))) * 0.05;
         
         gl_FragColor = vec4(vec3(color*0.5,color*1.0,color*1.0), 1.0);
     }
     
     );

    return kFragmentShaderString;
}