Add existing to tracked

node_modules/@cesium/engine/Source/Shaders/SunFS.glsl

@@ -0,0 +1,9 @@
+uniform sampler2D u_texture;
+
+in vec2 v_textureCoordinates;
+
+void main()
+{
+    vec4 color = texture(u_texture, v_textureCoordinates);
+    out_FragColor = czm_gammaCorrect(color);
+}