Updated gravity transform, cleaned up graph shader

shaders/graph/2.frag

@@ -0,0 +1,37 @@
+
+layout(pixel_center_integer) in vec4 gl_FragCoord;
+
+#request uniform "prev" tex
+uniform sampler2D tex;    /* screen texture    */
+#request uniform "screen" screen
+uniform ivec2     screen; /* screen dimensions */
+
+out vec4 fragment; /* output */
+
+#define OUTLINE vec4(0.15, 0.15, 0.15, 1)
+
+void main() {
+    fragment = texture(tex, vec2(gl_FragCoord.x / screen.x, gl_FragCoord.y / screen.y));
+    
+    vec4
+        a0 = texture(tex, vec2((gl_FragCoord.x + 1) / screen.x, (gl_FragCoord.y + 0) / screen.y)),
+        a1 = texture(tex, vec2((gl_FragCoord.x + 1) / screen.x, (gl_FragCoord.y + 1) / screen.y)),
+        a2 = texture(tex, vec2((gl_FragCoord.x + 0) / screen.x, (gl_FragCoord.y + 1) / screen.y)),
+        a3 = texture(tex, vec2((gl_FragCoord.x + 1) / screen.x, (gl_FragCoord.y + 0) / screen.y)),
+    
+        a4 = texture(tex, vec2((gl_FragCoord.x - 1) / screen.x, (gl_FragCoord.y - 0) / screen.y)),
+        a5 = texture(tex, vec2((gl_FragCoord.x - 1) / screen.x, (gl_FragCoord.y - 1) / screen.y)),
+        a6 = texture(tex, vec2((gl_FragCoord.x - 0) / screen.x, (gl_FragCoord.y - 1) / screen.y)),
+        a7 = texture(tex, vec2((gl_FragCoord.x - 1) / screen.x, (gl_FragCoord.y - 0) / screen.y));
+
+    vec4 avg = (a0 + a1 + a2 + a3 + a4 + a5 + a6 + a7) / 8.0;
+    if (avg.a > 0){
+        if (fragment.a <= 0) {
+            /* outline */
+            fragment = OUTLINE;
+        } else if (avg.a < 1 && gl_FragCoord.y != 0) {
+            /* creates a nice 'glint' along the edge of the spectrum */
+            fragment.rgb *= avg.a * 2;
+        }
+    }
+}