Resolve "Daybound & Nightbound"

forge-gui-mobile-dev/shaders/grayscale.frag

@@ -0,0 +1,15 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+varying vec4 v_color;
+varying vec2 v_texCoords;
+uniform sampler2D u_texture;
+uniform float u_grayness;
+
+void main() {
+  vec4 c = v_color * texture2D(u_texture, v_texCoords);
+  float grey = dot( c.rgb, vec3(0.22, 0.707, 0.071) );
+  vec3 blendedColor = mix(c.rgb, vec3(grey), u_grayness);
+  gl_FragColor = vec4(blendedColor.rgb, c.a);
+}