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samples/simple_shader/shaders/simple.frag

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#version 460 core
#include <flutter/runtime_effect.glsl>
precision mediump float;
uniform vec2 resolution;
out vec4 fragColor;
vec3 flutterBlue = vec3(5, 83, 177) / 255;
vec3 flutterNavy = vec3(4, 43, 89) / 255;
vec3 flutterSky = vec3(2, 125, 253) / 255;
void main() {
vec2 st = FlutterFragCoord().xy / resolution.xy;
vec3 color = vec3(0.0);
vec3 percent = vec3((st.x + st.y) / 2);
color =
mix(mix(flutterSky, flutterBlue, percent * 2),
mix(flutterBlue, flutterNavy, percent * 2 - 1), step(0.5, percent));
fragColor = vec4(color, 1);
}