testsuite: Remove broken GL comparison tests

These only work on special hardware, which not even I have anymore.
We'll need to redo them in a way that works on different systems.

testsuite/gsk/gl/cross_fade.txt

@@ -1,13 +0,0 @@
-cross-fade {
-  progress: 0.5;
-  start: color {
-    bounds: 0 0 200 200;
-    color: white;
-  }
-  end: linear-gradient {
-    bounds: 100 100 200 200;
-    start: 200 100;
-    end: 200 300;
-    stops: 0 red, 1 blue;
-  }
-}

testsuite/gsk/gl/gradient_clipped.txt

@@ -1,9 +0,0 @@
-rounded-clip {
-  clip: 0 0 50 100 / 25;
-  child: linear-gradient {
-    bounds: 0 0 50 100;
-    start: 0 0;
-    end: 0 100;
-    stops: 0 red, 1 blue;
-  }
-}

testsuite/gsk/gl/gradient_simple.txt

@@ -1,14 +0,0 @@
-container {
-  linear-gradient {
-    bounds: 0 0 50 100;
-    start: 0 0;
-    end: 0 100;
-    stops: 0 red, 1 blue;
-  }
-  linear-gradient {
-    bounds: 50 0 50 100;
-    start: 50 0;
-    end: 100 0;
-    stops: 0 red, 1 blue;
-  }
-}

testsuite/gsk/gl/outset_shadow_blurred_offset.txt

@@ -1,8 +0,0 @@
-outset-shadow {
-  outline: 100 100 40 40 / 5.714286 2.857143 17.142859 22.857143;
-  color: rgba(0, 0, 0, 0.5);
-  dx: 20;
-  dy: 20;
-  spread: 1;
-  blur: 4;
-}

testsuite/gsk/gl/outset_shadow_blurred_simple.txt

@@ -1,8 +0,0 @@
-outset-shadow {
-  outline: 100 100 200 200;
-  color: black;
-  dx: 0;
-  dy: 0;
-  spread: 0;
-  blur: 40;
-}

testsuite/gsk/gl/outset_shadow_blurred_small.txt

@@ -1,8 +0,0 @@
-outset-shadow {
-  outline: 100 100 40 40 / 5.714286 2.857143 17.142859 22.857143;
-  color: rgba(0, 0, 0, 0.5);
-  dx: 0;
-  dy: 0;
-  spread: 1;
-  blur: 4;
-}

testsuite/gsk/gl/outset_shadow_rounded1.txt

@@ -1,8 +0,0 @@
-outset-shadow {
-  outline: 100 100 200 200 / 50 0 50 0;
-  color: rgba(0, 0, 0, 0.5);
-  dx: 10;
-  dy: 10;
-  spread: 30;
-  blur: 0;
-}

testsuite/gsk/gl/outset_shadow_rounded2.txt

@@ -1,8 +0,0 @@
-outset-shadow {
-  outline: 100 100 200 200 / 0 100 0 100;
-  color: rgba(0, 0, 0, 0.5);
-  dx: 10;
-  dy: 10;
-  spread: 30;
-  blur: 0;
-}

testsuite/gsk/meson.build

@@ -48,19 +48,12 @@ test('nodes (cairo)', test_render_nodes,
 
 # Interesting render nodes proven to be rendered 'correctly' by the GL renderer.
 gl_tests = [
-  ['outset shadow rounded1',       'outset_shadow_rounded1'],
-  ['outset shadow rounded2',       'outset_shadow_rounded2'],
-  ['outset shadow blurred simple', 'outset_shadow_blurred_simple'],
-  ['outset shadow blurred small',  'outset_shadow_blurred_small'],
-  ['outset shadow blurred offset', 'outset_shadow_blurred_offset'],
-  ['Crossfade simple',             'cross_fade'],
-  ['gradient simple',              'gradient_simple'],
-  ['gradient clipped',             'gradient_clipped'],
+  ['cross fade in opacity',        'cross-fade-in-opacity'],
 ]
 
 foreach gl_test : gl_tests
   test('GL ' + gl_test[0], compare_render,
-       args: [join_paths(meson.current_source_dir(), 'gl', gl_test[1] + '.txt'),
+       args: [join_paths(meson.current_source_dir(), 'gl', gl_test[1] + '.node'),
               join_paths(meson.current_source_dir(), 'gl', gl_test[1] + '.gl.png')],
        env: [ 'GIO_USE_VOLUME_MONITOR=unix',
               'GSETTINGS_BACKEND=memory',