Disable second 'graph' pass if nessecary (& other formatting), see #97

render.c

@@ -639,7 +639,7 @@ void transform_fft(struct gl_data* d, void** _, void* in) {
     float wtemp, wr, wpr, wpi, wi, theta;
     float tempr, tempi;
  
-    // reverse-binary reindexing
+    /* reverse-binary reindexing */
     n = nn << 1;
     j = 1;
     for (i = 1; i < n; i += 2) {
@@ -655,7 +655,7 @@ void transform_fft(struct gl_data* d, void** _, void* in) {
         j += m;
     };
  
-    // here begins the Danielson-Lanczos section
+    /* here begins the Danielson-Lanczos section */
     mmax = 2;
     while (n > mmax) {
         istep = mmax << 1;

shaders/graph/2.frag

@@ -9,6 +9,10 @@ out vec4 fragment; /* output */
 #include "@graph.glsl"
 #include ":graph.glsl"
 
+#if DRAW_OUTLINE == 0 && DRAW_HIGHLIGHT == 0
+#error __disablestage
+#endif
+
 void main() {
     fragment = texelFetch(tex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);