From 542ee407a576b161aa3984b51c700abda56e957c Mon Sep 17 00:00:00 2001
From: Fabian <fabian@fmbb.se>
Date: Sat, 18 Feb 2023 12:23:32 +0100
Subject: [PATCH] Declare fragment shader outputs

---
 shaders/simple_color.frag | 4 +++-
 shaders/simple_epic.frag  | 4 +++-
 shaders/simple_image.frag | 4 +++-
 shaders/simple_text.frag  | 4 +++-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/shaders/simple_color.frag b/shaders/simple_color.frag
index f4373609..7f95d639 100644
--- a/shaders/simple_color.frag
+++ b/shaders/simple_color.frag
@@ -2,6 +2,8 @@
 
 in vec4 out_color;
 
+out vec4 fragColor;
+
 void main() {
-    gl_FragColor = out_color;
+    fragColor = out_color;
 }
diff --git a/shaders/simple_epic.frag b/shaders/simple_epic.frag
index 9cfc9000..91312bb4 100644
--- a/shaders/simple_epic.frag
+++ b/shaders/simple_epic.frag
@@ -6,6 +6,8 @@ uniform sampler2D image;
 
 in vec2 out_uv;
 
+out vec4 fragColor;
+
 vec3 hsl2rgb(vec3 c) {
     vec3 rgb = clamp(abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),6.0)-3.0)-1.0, 0.0, 1.0);
     return c.z + c.y * (rgb-0.5)*(1.0-abs(2.0*c.z-1.0));
@@ -18,5 +20,5 @@ void main() {
     float alpha = smoothstep(0.5 - aaf, 0.5 + aaf, d);
     vec2 frag_uv = gl_FragCoord.xy / resolution;
     vec4 rainbow = vec4(hsl2rgb(vec3((time + frag_uv.x + frag_uv.y), 0.5, 0.5)), 1.0);
-    gl_FragColor = vec4(rainbow.rgb, alpha);
+    fragColor = vec4(rainbow.rgb, alpha);
 }
diff --git a/shaders/simple_image.frag b/shaders/simple_image.frag
index 487cd219..6617be33 100644
--- a/shaders/simple_image.frag
+++ b/shaders/simple_image.frag
@@ -4,6 +4,8 @@ uniform sampler2D image;
 
 in vec2 out_uv;
 
+out vec4 fragColor;
+
 void main() {
-    gl_FragColor = texture(image, out_uv);
+    fragColor = texture(image, out_uv);
 }
diff --git a/shaders/simple_text.frag b/shaders/simple_text.frag
index f0413756..0fb58f3e 100644
--- a/shaders/simple_text.frag
+++ b/shaders/simple_text.frag
@@ -5,9 +5,11 @@ uniform sampler2D image;
 in vec4 out_color;
 in vec2 out_uv;
 
+out vec4 fragColor;
+
 void main() {
     float d = texture(image, out_uv).r;
     float aaf = fwidth(d);
     float alpha = smoothstep(0.5 - aaf, 0.5 + aaf, d);
-    gl_FragColor = vec4(out_color.rgb, alpha);
+    fragColor = vec4(out_color.rgb, alpha);
 }