fix shaders format

data/shaders/checkerboard.glsl

@@ -1,8 +1,11 @@
 [[vertex]]
+
 uniform mat4 mvp;
+
 in vec4 pos;
 in vec2 uvs;
 out vec2 uv;
+
 void main()
 {
     uv = uvs;
@@ -10,15 +13,20 @@ void main()
 }
 
 [[fragment]]
+
 uniform bool colorize;
+
 in mediump vec2 uv;
 out mediump vec4 frag;
+
 void main()
 {
     const mediump vec4 c1 = vec4(1.0, 1.0, 1.0, 1.0);
     const mediump vec4 c2 = vec4(0.9, 0.9, 0.9, 1.0);
     mediump vec2 c = floor(fract(uv * 10.0) * 2.0);
     mediump float alpha = mix(c.x, 1.0 - c.x, c.y);
-    if (colorize) frag = mix(c1, c2, alpha) * vec4(fract(uv.x * 5.0), uv.y, 1.0, 1.0);
-    else frag = mix(c1, c2, alpha);
+    if (colorize)
+        frag = mix(c1, c2, alpha) * vec4(fract(uv.x * 5.0), uv.y, 1.0, 1.0);
+    else 
+        frag = mix(c1, c2, alpha);
 }