Deprecate 'nativeonly', fix passing garbage data for vec4 stdin

render.c

@@ -922,6 +922,7 @@ struct renderer* rd_new(const char** paths,      const char* entry,
         {
             .name = "nativeonly", .fmt = "b",
             .handler = RHANDLER(name, args, {
+                    fprintf(stderr, "WARNING: `nativeonly` is deprecated, use `#if PREMULTIPLY_ALPHA == 1`!\n");
                     if (current)
                         current->nativeonly = *(bool*) args[0];
                     else {
@@ -1698,7 +1699,7 @@ bool rd_update(struct renderer* r, float* lb, float* rb, size_t bsz, bool modifi
                 case STDIN_TYPE_VEC4:
                     glUniform4f(current->stdin_uniform,
                                 stdin_parsed.f[0], stdin_parsed.f[1],
-                                stdin_parsed.f[2], stdin_parsed.f[4]);
+                                stdin_parsed.f[2], stdin_parsed.f[3]);
                     break;
                 default: break;
             }

shaders/bars.glsl

@@ -11,14 +11,16 @@
 #define BAR_OUTLINE_WIDTH 0
 /* Amplify magnitude of the results each bar displays */
 #define AMPLIFY 300
-/* Alpha channel for bars color */
-#define ALPHA 0.7
+/* Whether the current settings use the alpha channel;
+   enabling this is required for alpha to function
+   correctly on X11 with `"native"` transparency. */
+#define USE_ALPHA 0
 /* How strong the gradient changes */
 #define GRADIENT_POWER 60
 /* Bar color changes with height */
 #define GRADIENT (d / GRADIENT_POWER + 1)
 /* Bar color */
-#define COLOR (#3366b2 * GRADIENT * ALPHA)
+#define COLOR (#3366b2 * GRADIENT)
 /* Direction that the bars are facing, 0 for inward, 1 for outward */
 #define DIRECTION 0
 /* Whether to switch left/right audio buffers */

shaders/util/premultiply.frag

@@ -1,5 +1,7 @@
 
-#request nativeonly true
+#if PREMULTIPLY_ALPHA == 0
+#error __distablestage
+#endif
 
 #request uniform "prev" tex
 uniform sampler2D tex;