Migrate builtin macros to '__' prefix

shaders/util/premultiply.frag

@@ -1,5 +1,5 @@
 
-#if PREMULTIPLY_ALPHA == 0
+#if __PREMULTIPLY_ALPHA == 0
 #error __disablestage
 #endif
 
@@ -11,7 +11,5 @@ in vec4 gl_FragCoord;
 
 void main() {
     fragment = texelFetch(tex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);
-    #if PREMULTIPLY_ALPHA > 0
     fragment.rgb *= fragment.a;
-    #endif
 }

shaders/util/smooth.glsl

@@ -34,14 +34,14 @@ float iscale_audio(float idx) {
     return -log((SAMPLE_RANGE) * idx) / (SAMPLE_SCALE);
 }
 
-/* Note: the SMOOTH_FACTOR macro is defined by GLava itself, from `#request setsmoothfactor`*/
+/* Note: the __SMOOTH_FACTOR macro is defined by GLava itself, from `#request setsmoothfactor`*/
 
 float smooth_audio(in sampler1D tex, int tex_sz, highp float idx) {
     
-    #if PRE_SMOOTHED_AUDIO < 1
+    #if __PRE_SMOOTHED_AUDIO < 1
     float
-        smin = scale_audio(clamp(idx - SMOOTH_FACTOR, 0, 1)) * tex_sz,
-        smax = scale_audio(clamp(idx + SMOOTH_FACTOR, 0, 1)) * tex_sz;
+        smin = scale_audio(clamp(idx - __SMOOTH_FACTOR, 0, 1)) * tex_sz,
+        smax = scale_audio(clamp(idx + __SMOOTH_FACTOR, 0, 1)) * tex_sz;
     float m = ((smax - smin) / 2.0F), s, w;
     float rm = smin + m; /* middle */
     

shaders/util/smooth_pass.frag

@@ -6,8 +6,8 @@ uniform int w;
 out vec4 fragment;
 in vec4 gl_FragCoord;
 
-#undef PRE_SMOOTHED_AUDIO
-#define PRE_SMOOTHED_AUDIO 0
+#undef __PRE_SMOOTHED_AUDIO
+#define __PRE_SMOOTHED_AUDIO 0
 
 #include ":util/smooth.glsl"