From b3162d8f6ef07dd32adbc860d72e26c8c3c0ae2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20Br=C3=BCckner?= <mail@moritz-brueckner.de>
Date: Sat, 10 Jul 2021 22:41:19 +0200
Subject: [PATCH] Fix visual artifacts caused by invalid gbuffer2 on OpenGL

---
 .../deferred_light/deferred_light.frag.glsl    | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/Shaders/deferred_light/deferred_light.frag.glsl b/Shaders/deferred_light/deferred_light.frag.glsl
index fe81fad3..fbe01534 100644
--- a/Shaders/deferred_light/deferred_light.frag.glsl
+++ b/Shaders/deferred_light/deferred_light.frag.glsl
@@ -21,7 +21,9 @@
 uniform sampler2D gbufferD;
 uniform sampler2D gbuffer0;
 uniform sampler2D gbuffer1;
+#ifdef _gbuffer2
 uniform sampler2D gbuffer2;
+#endif
 
 #ifdef _VoxelAOvar
 uniform sampler3D voxels;
@@ -206,7 +208,9 @@ void main() {
 	vec3 v = normalize(eye - p);
 	float dotNV = max(dot(n, v), 0.0);
 
+#ifdef _gbuffer2
 	vec4 g2 = textureLod(gbuffer2, texCoord, 0.0);
+#endif
 
 #ifdef _MicroShadowing
 	occspec.x = mix(1.0, occspec.x, dotNV); // AO Fresnel
@@ -221,14 +225,16 @@ void main() {
 
 	vec3 envl = shIrradiance(n, shirr);
 
-	if (g2.b < 0.5) {
-		envl = envl;
-	} else {
-		envl = vec3(1.0);
-	}
+	#ifdef _gbuffer2
+		if (g2.b < 0.5) {
+			envl = envl;
+		} else {
+			envl = vec3(1.0);
+		}
+	#endif
 
 	#ifdef _EnvTex
-	envl /= PI;
+		envl /= PI;
 	#endif
 #else
 	vec3 envl = vec3(1.0);