--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/shaders/sharp.f.glsl	Sat Apr 27 17:37:12 2019 -0700
@@ -0,0 +1,31 @@
+
+uniform sampler2D textures[2];
+
+varying mediump vec2 texcoord;
+
+void main()
+{
+	mediump float x0 = (floor(texcoord.x * 512.0 - 0.25) + 0.5)/512.0;
+	mediump float x1 = (floor(texcoord.x * 512.0 + 0.25) + 0.5)/512.0;
+	mediump float y0 = (floor(texcoord.y * 512.0 + 0.25) + 0.5)/512.0;
+	mediump float y1 = (floor(texcoord.y * 512.0 - 0.25) + 0.5)/512.0;
+	
+	
+	mediump vec2 modifiedCoord0 = vec2(texcoord.x, (floor(texcoord.y * 512.0 + 0.25) + 0.5)/512.0);
+	mediump vec2 modifiedCoord1 = vec2(texcoord.x, (floor(texcoord.y * 512.0 - 0.25) + 0.5)/512.0);
+	mediump float ymix = (sin(texcoord.y * 1024.0 * 3.14159265359) + 1.0) * 0.5;
+	mediump float xmix = (sin(texcoord.x * 1024.0 * 3.14159265359) + 1.0) * 0.5;
+	gl_FragColor = mix(
+		mix(
+			texture2D(textures[1], vec2(x0, y1)),
+			texture2D(textures[0], vec2(x0, y0)),
+			ymix
+		),
+		mix(
+			texture2D(textures[1], vec2(x1, y1)),
+			texture2D(textures[0], vec2(x1, y0)),
+			ymix
+		),
+		xmix
+	);
+}