[RELEASE] u22-v03

This version is submitted to U22 breau.

core/loshader/pixsort.vshader

@@ -0,0 +1,12 @@
+out vec2 v_uv;
+
+void main(void) {
+  const vec2[] verts = vec2[](
+    vec2(-1.,  1.), vec2(-1., -1.), vec2( 1., -1.),
+    vec2(-1.,  1.), vec2( 1., -1.), vec2( 1.,  1.)
+  );
+
+  v_uv = gl_VertexID < verts.length()? verts[gl_VertexID]: vec2(0.);
+
+  gl_Position = vec4(v_uv, 0., 1.);
+}