Added support for mono bars rendering, closes #123

shaders/glava/bars.glsl

@@ -1,3 +1,4 @@
+/* Note: to only render a single channel, see `setmirror` in `rc.glsl`. */
 
 /* Center line thickness (pixels) */
 #define C_LINE 1
@@ -24,8 +25,10 @@
 /* Whether to switch left/right audio buffers */
 #define INVERT 0
 /* Whether to flip the output vertically */
-#define FLIP 0
+#define FLIP 1
 /* Whether to mirror output along `Y = X`, causing output to render on the left side of the window */
 /* Use with `FLIP 1` to render on the right side */
 #define MIRROR_YX 0
+/* Whether to disable mono rendering when `#request setmirror true` is set in `rc.glsl`. */
+#define DISABLE_MONO 0
 

shaders/glava/bars/1.frag

@@ -29,6 +29,10 @@ out vec4 fragment;
 #define TWOPI 6.28318530718
 #define PI 3.14159265359
 
+#if DISABLE_MONO == 1
+#define CHANNELS 2
+#endif
+
 void main() {
 
     #if MIRROR_YX == 0
@@ -42,8 +46,16 @@ void main() {
     #define AREA_X gl_FragCoord.y
     #define AREA_Y gl_FragCoord.x
     #endif
-    
+
+    #if CHANNELS == 2
     float dx = (AREA_X - (AREA_WIDTH / 2));
+    #else
+    #if INVERT == 1
+    float dx = AREA_WIDTH - AREA_X;
+    #else
+    float dx = AREA_X;
+    #endif
+    #endif
     #if FLIP == 0
     float d = AREA_Y;
     #else
@@ -57,8 +69,13 @@ void main() {
     float p, s;
     if (md < ceil(float(BAR_WIDTH) / 2) && md >= -floor(float(BAR_WIDTH) / 2)) {  /* if not in gap */
         s = dx / section;
-        p = (sign(s) == 1.0 ? ceil(s) : floor(s)) / float(nbars / 2); /* position, (-1.0F, 1.0F))     */
-        p += sign(p) * ((0.5F + center) / AREA_WIDTH);    /* index center of bar position */
+        p = (sign(s) == 1.0 ? ceil(s) : floor(s));
+        #if CHANNELS == 2
+        p /= float(nbars / 2);
+        #else
+        p /= float(nbars);
+        #endif
+        p += sign(p) * ((0.5F + center) / AREA_WIDTH);                /* index center of bar position */
         /* Apply smooth function and index texture */
         #define smooth_f(tex, p) smooth_audio(tex, audio_sz, p)
         float v;
@@ -72,7 +89,9 @@ void main() {
             #if DIRECTION == 1
             p = 1.0F - p;
             #endif
-            #if INVERT > 0
+            #if CHANNELS == 1
+            v = smooth_f(audio_l, p);
+            #elif INVERT > 0 
             v = smooth_f(audio_l, p);
             #else
             v = smooth_f(audio_r, p);
@@ -82,7 +101,9 @@ void main() {
             #if DIRECTION == 1
             p = 1.0F - p;
             #endif
-            #if INVERT > 0
+            #if CHANNELS == 1
+            v = smooth_f(audio_l, p);
+            #elif INVERT > 0
             v = smooth_f(audio_r, p);
             #else
             v = smooth_f(audio_l, p);

shaders/glava/rc.glsl

@@ -36,7 +36,8 @@
    "none"   - Disable window opacity completely. */
 #request setopacity "native"
 
-/* Whether to mirror left and right audio input channels from PulseAudio.*/
+/* Whether to average and mirror left and right audio input channels.
+   This may cause some modules to only render a single channel. */
 #request setmirror false
 
 /* OpenGL context and GLSL shader versions, do not change unless