reference/shaders/frag/sample-parameter.frag

#version 310 es
#extension GL_OES_sample_variables : require
precision mediump float;
precision highp int;

layout(location = 0) out vec2 FragColor;

void main()
{
    FragColor = (gl_SamplePosition + vec2(float(gl_SampleMaskIn[0]))) + vec2(float(gl_SampleID));
    gl_SampleMask[0] = 1;
}