From a3fd46c516643b259351f963787bc9ece066f70f Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Thu, 29 Oct 2020 09:37:33 -0700
Subject: [PATCH] glsl: tweak pre-processor to support Apple GLSL compiler

The Apple GLSL compiler cannot deal with empty pre-processor blocks such as

  #if GSK_GLES
  #elif GSK_LEGACY
---
 gsk/resources/glsl/preamble.fs.glsl | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/gsk/resources/glsl/preamble.fs.glsl b/gsk/resources/glsl/preamble.fs.glsl
index 85b11c013e..c2cd1cdc29 100644
--- a/gsk/resources/glsl/preamble.fs.glsl
+++ b/gsk/resources/glsl/preamble.fs.glsl
@@ -5,10 +5,9 @@ uniform float u_alpha;// = 1.0;
 uniform vec4 u_viewport;
 uniform vec4[3] u_clip_rect;
 
-#if GSK_GLES
-#elif GSK_LEGACY
+#if defined(GSK_LEGACY)
 _OUT_ vec4 outputColor;
-#else
+#elif !defined(GSK_GLES)
 _OUT_ vec4 outputColor;
 #endif