change shader version to 100 for android support

shaders/sun_100.fs

@@ -0,0 +1,36 @@
+#version 100
+
+precision mediump float;
+
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+
+uniform vec3 color;
+uniform float sun_radius;
+uniform float start_transperency;
+
+vec2 offset = vec2(1.0, 1.0);
+float sun_end = 1.0;
+
+void main()
+{
+    offset.x -= fragTexCoord.x * 2.0;
+    offset.y -= fragTexCoord.y * 2.0;
+    float radius = length(offset);
+
+    if(radius < sun_radius){
+
+        gl_FragColor = vec4(color, 1.0);
+
+    }else if(radius < sun_end){
+
+        float gradient = radius;
+        gradient -= sun_radius;
+        gradient = gradient / (sun_end - sun_radius) * start_transperency;
+        gl_FragColor = vec4(color, start_transperency - gradient);
+
+    }else{
+        gl_FragColor = vec4(color, 0.0);
+    }
+}