#version 310 es precision mediump float; layout(location = 0) out vec4 FragColor; layout(location = 0) in vec4 v0; void main() { float lut[5] = float[](1.0, 2.0, 3.0, 4.0, 5.0); for (int i = 0; i < 4; i++, FragColor += lut[i]) { } }