From 364c4695a9a900374ebdfbbc1e4e67f7fdd8b7fc Mon Sep 17 00:00:00 2001
From: binary <1253152061@qq.com>
Date: Mon, 25 Nov 2019 10:13:19 +0800
Subject: [PATCH] Update ssao.frag

samplePos.z bias  can remove banding
---
 data/shaders/ssao/ssao.frag | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/data/shaders/ssao/ssao.frag b/data/shaders/ssao/ssao.frag
index 00ed70b0..8e3bb5b7 100644
--- a/data/shaders/ssao/ssao.frag
+++ b/data/shaders/ssao/ssao.frag
@@ -40,6 +40,8 @@ void main()
 
 	// Calculate occlusion value
 	float occlusion = 0.0f;
+	// remove banding
+	float bais = 0.01f;
 	for(int i = 0; i < SSAO_KERNEL_SIZE; i++)
 	{		
 		vec3 samplePos = TBN * uboSSAOKernel.samples[i].xyz; 
@@ -57,9 +59,9 @@ void main()
 #ifdef RANGE_CHECK
 		// Range check
 		float rangeCheck = smoothstep(0.0f, 1.0f, SSAO_RADIUS / abs(fragPos.z - sampleDepth));
-		occlusion += (sampleDepth >= samplePos.z ? 1.0f : 0.0f) * rangeCheck;           
+		occlusion += (sampleDepth >= samplePos.z + bais ? 1.0f : 0.0f) * rangeCheck;           
 #else
-		occlusion += (sampleDepth >= samplePos.z ? 1.0f : 0.0f);  
+		occlusion += (sampleDepth >= samplePos.z + bais ? 1.0f : 0.0f);  
 #endif
 	}
 	occlusion = 1.0 - (occlusion / float(SSAO_KERNEL_SIZE));