[gtk/matthiasc/glshader-node: 12/18] gtk-demo: Only use one GskGLShader in fishbowl

[Matthias Clasen <matthiasc src gnome org>]

commit 947a93381917af1f3116ebd04e7d5834fd1b29a2
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Sep 28 13:01:18 2020 +0200

    gtk-demo: Only use one GskGLShader in fishbowl
    
    We don't want to use a new shader per paintable, because then we will
    need to recompile each one. Also remove some leftover unused vars from
    the cogs glsl.

 demos/gtk-demo/cogs2.glsl | 3 ---
 demos/gtk-demo/fishbowl.c | 7 ++++---
 2 files changed, 4 insertions(+), 6 deletions(-)
---
diff --git a/demos/gtk-demo/cogs2.glsl b/demos/gtk-demo/cogs2.glsl
index 59fea55326..8d131eca8d 100644
--- a/demos/gtk-demo/cogs2.glsl
+++ b/demos/gtk-demo/cogs2.glsl
@@ -1,8 +1,5 @@
 uniform float iTime;
 
-in vec2 fragCoord;
-out vec4 vFragColor;
-
 // Originally from: https://www.shadertoy.com/view/3ljyDD
 // License CC0: Hexagonal tiling + cog wheels
 //  Nothing fancy, just hexagonal tiling + cog wheels
diff --git a/demos/gtk-demo/fishbowl.c b/demos/gtk-demo/fishbowl.c
index 703a872cc1..659318b7cd 100644
--- a/demos/gtk-demo/fishbowl.c
+++ b/demos/gtk-demo/fishbowl.c
@@ -169,11 +169,12 @@ static GtkWidget *
 create_cogs (void)
 {
   GtkWidget *picture;
-  GskGLShader *shader;
+  static GskGLShader *cog_shader = NULL;
   GdkPaintable *paintable;
 
-  shader = gsk_gl_shader_new_from_resource ("/gltransition/cogs2.glsl");
-  paintable = gsk_shader_paintable_new (shader, NULL);
+ if (cog_shader == NULL)
+    cog_shader = gsk_gl_shader_new_from_resource ("/gltransition/cogs2.glsl");
+  paintable = gsk_shader_paintable_new (g_object_ref (cog_shader), NULL);
   picture = gtk_picture_new_for_paintable (paintable);
   gtk_widget_set_size_request (picture, 150, 75);
   gtk_widget_add_tick_callback (picture, update_paintable, NULL, NULL);