[gtk/glshader-paintable: 3/3] gtk-demo: Add a shader paintable to the fishbowl

[Matthias Clasen <matthiasc src gnome org>]

commit 9c00609d52153fa46a97aa543127cadcd6991ea1
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Sep 24 21:15:48 2020 -0400

    gtk-demo: Add a shader paintable to the fishbowl
    
    This gets around 500 instances at 60fps on my system.

 demos/gtk-demo/fishbowl.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
---
diff --git a/demos/gtk-demo/fishbowl.c b/demos/gtk-demo/fishbowl.c
index 40c8203726..1a69e31a87 100644
--- a/demos/gtk-demo/fishbowl.c
+++ b/demos/gtk-demo/fishbowl.c
@@ -149,6 +149,42 @@ create_switch (void)
   return w;
 }
 
+static void
+picture_mapped (GtkWidget          *picture,
+                GskShaderPaintable *paintable)
+{
+  GskGLShader *shader;
+  int idx;
+  GdkFrameClock *frame_clock;
+
+  shader = gsk_shader_paintable_get_shader (paintable);
+  idx = gsk_gl_shader_find_uniform_by_name (shader, "iTime");
+  frame_clock = gtk_widget_get_frame_clock (picture);
+
+  gsk_shader_paintable_set_frame_clock (paintable, frame_clock,idx);
+}
+
+static GtkWidget *
+create_cogs (void)
+{
+  GtkWidget *picture;
+  GskGLShader *shader;
+  int size;
+  GdkPaintable *paintable;
+
+  shader = gsk_gl_shader_new_from_resource ("/gltransition/cogs2.glsl");
+
+  size = gsk_gl_shader_get_uniforms_size (shader);
+  paintable = gsk_shader_paintable_new (shader, g_bytes_new_take (g_new0 (guchar, size), size));
+
+  picture = gtk_picture_new_for_paintable (paintable);
+  gtk_widget_set_size_request (picture, 150, 75);
+
+  g_signal_connect (picture, "map", G_CALLBACK (picture_mapped), paintable);
+
+  return picture;
+}
+
 static void
 mapped (GtkWidget *w)
 {
@@ -185,6 +221,7 @@ static const struct {
   { "Gears",      create_gears          },
   { "Switch",     create_switch         },
   { "Menubutton", create_menu_button    },
+  { "Shader",     create_cogs           },
 };
 
 static int selected_widget_type = -1;