[gtk/wip/chergert/shadertoy-macos-fix] demos: make alienplanet demo work on macOS OpenGL

[Christian Hergert <chergert src gnome org>]

commit 8e62ff50febaf05a5b1f4900f6c5ea52713383c7
Author: Christian Hergert <chergert redhat com>
Date:   Thu Dec 3 10:20:11 2020 -0800

    demos: make alienplanet demo work on macOS OpenGL
    
    On the macOS OpenGL implementation, the use of noise2 as a
    function within the glsl shader collides with the builtin noise2 of a
    different signature.
    
    This changes the name to something similar (noize2) so that we
    do not risk colliding names when linking.
    
    With this commit, the shadertoy alienplanet demo works on mac
    OpenGL (albeit still with the Cairo renderer).

 demos/gtk-demo/alienplanet.glsl | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/demos/gtk-demo/alienplanet.glsl b/demos/gtk-demo/alienplanet.glsl
index 3e3aea3ac8..ad77fb15f4 100644
--- a/demos/gtk-demo/alienplanet.glsl
+++ b/demos/gtk-demo/alienplanet.glsl
@@ -67,7 +67,7 @@ vec2 raySphere(vec3 ro, vec3 rd, vec4 sphere) {
   return vec2(t0, t1);
 }
 
-float noise1(vec2 p) {
+float noize1(vec2 p) {
   vec2 n = mod2(p, vec2(cellWidth));
   vec2 hh = hash(sqrt(2.0)*(n+1000.0));
   hh.x *= hh.y;
@@ -81,7 +81,7 @@ float noise1(vec2 p) {
   return h*0.25;
 }
 
-float noise2(vec2 p) {
+float noize2(vec2 p) {
   vec2 n = mod2(p, vec2(cellWidth));
   vec2 hh = hash(sqrt(2.0)*(n+1000.0));
   hh.x *= hh.y;
@@ -114,7 +114,7 @@ float height(vec2 p, float dd, int mx) {
   int i = 0;
 
   for (; i < 4;++i) {
-    float nn = a*noise2(p);
+    float nn = a*noize2(p);
     s += nn;
     d += abs(a);
     p += o;
@@ -130,7 +130,7 @@ float height(vec2 p, float dd, int mx) {
   mx = int(mix(float(4), float(mx), step(rdd, far)));
 
   for (; i < mx; ++i) {
-    float nn = a*noise1(p);
+    float nn = a*noize1(p);
     s += nn;
     d += abs(a);
     p += o;