snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

simple_shader/shaders/simple.frag

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+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#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);
+}