GLES2: Content shader stuff (possibly unfinished)

Resources/Textures/Shaders/circle_mask.swsl

@@ -1,17 +1,17 @@
-vec4 circle(in vec2 uv, in vec2 pos, float rad, in vec3 color) {
-    float d = length(pos - uv) - rad;
-    float t = clamp(d, 0.0, 1.0);
+highp vec4 circle(in highp vec2 uv, in highp vec2 pos, highp float rad, in highp vec3 color) {
+    highp float d = length(pos - uv) - rad;
+    highp float t = clamp(d, 0.0, 1.0);
     return vec4(color, t);
 }
 void fragment(){
-	vec2 uv = FRAGCOORD.xy;
-    vec2 res_xy = vec2(1.0/SCREEN_PIXEL_SIZE.x, 1.0/SCREEN_PIXEL_SIZE.y);
-    vec2 center = res_xy*0.5;
-    float radius = 0.05 * res_xy.y;
+	highp vec2 uv = FRAGCOORD.xy;
+    highp vec2 res_xy = vec2(1.0/SCREEN_PIXEL_SIZE.x, 1.0/SCREEN_PIXEL_SIZE.y);
+    highp vec2 center = res_xy*0.5;
+    highp float radius = 0.05 * res_xy.y;
 
-    vec4 layer1 = vec4(vec3(0), 0.0);
+    highp vec4 layer1 = vec4(vec3(0.0), 0.0);
     
-    vec4 layer2 = circle(uv, center, radius, vec3(0));
+    highp vec4 layer2 = circle(uv, center, radius, vec3(0.0));
 
     COLOR = mix(layer1, layer2, layer2.a);
-}
+}