From 72d069325293549277197ae02e1303f8a557ca3e Mon Sep 17 00:00:00 2001
From: Olivier Prat <olivier@zvork.fr>
Date: Tue, 2 Oct 2018 18:46:01 +0200
Subject: [PATCH] Clean up for stereo

---
 .../render-utils/src/ssao_makeOcclusion.slf   | 77 ++++++++++---------
 1 file changed, 40 insertions(+), 37 deletions(-)

diff --git a/libraries/render-utils/src/ssao_makeOcclusion.slf b/libraries/render-utils/src/ssao_makeOcclusion.slf
index ec747062e8..8b44fd8301 100644
--- a/libraries/render-utils/src/ssao_makeOcclusion.slf
+++ b/libraries/render-utils/src/ssao_makeOcclusion.slf
@@ -56,51 +56,54 @@ void main(void) {
     vec3 fragNormalES = buildNormal(side, fragUVPos, fragPositionES, deltaDepthUV);
 #endif
 
-    // Choose the screen-space sample radius
-    float diskPixelRadius = evalDiskRadius(fragPositionES.z, sideDepthSize);
-    if (isHorizonBased()) {
-        diskPixelRadius = min(diskPixelRadius, SSAO_HBAO_MAX_RADIUS);
-    }
+    float occlusion = 1.0;
 
-    // Let's make noise 
-    float randomPatternRotationAngle = 0.0;
-
-    // Accumulate the obscurance for each samples
-    float obscuranceSum = 0.0;
-    int numSamples = int(getNumSamples());
-    float invNumSamples = getInvNumSamples();
-
-    if (isHorizonBased()) {
-        randomPatternRotationAngle = getAngleDithering(fragPixelPos);
-
-        for (int i = 0; i < numSamples; ++i) {
-            vec3 deltaTap = getUnitTapLocation(i, 1.0, randomPatternRotationAngle, PI);
-            obscuranceSum += evalVisibilityHBAO(side, fragUVPos, deltaDepthUV, deltaTap.xy, diskPixelRadius, fragPositionES, fragNormalES);
+    if (fragPositionES.z > (1.0-getPosLinearDepthFar())) {
+        // Choose the screen-space sample radius
+        float diskPixelRadius = evalDiskRadius(fragPositionES.z, sideDepthSize);
+        if (isHorizonBased()) {
+            diskPixelRadius = min(diskPixelRadius, SSAO_HBAO_MAX_RADIUS);
         }
-        obscuranceSum *= invNumSamples;
+
+        // Let's make noise 
+        float randomPatternRotationAngle = 0.0;
+
+        // Accumulate the obscurance for each samples
+        float obscuranceSum = 0.0;
+        int numSamples = int(getNumSamples());
+        float invNumSamples = getInvNumSamples();
+
+        if (isHorizonBased()) {
+            randomPatternRotationAngle = getAngleDithering(fragPixelPos);
+
+            for (int i = 0; i < numSamples; ++i) {
+                vec3 deltaTap = getUnitTapLocation(i, 1.0, randomPatternRotationAngle, PI);
+                obscuranceSum += evalVisibilityHBAO(side, fragUVPos, deltaDepthUV, deltaTap.xy, diskPixelRadius, fragPositionES, fragNormalES);
+            }
+            obscuranceSum *= invNumSamples;
 #if HBAO_USE_COS_ANGLE
-        obscuranceSum = 1.0 - obscuranceSum * getObscuranceScaling();
+            obscuranceSum = 1.0 - obscuranceSum * getObscuranceScaling();
 #else
-        obscuranceSum = mix(1.0, obscuranceSum, getObscuranceScaling());
+            obscuranceSum = mix(1.0, obscuranceSum, getObscuranceScaling());
 #endif
-    } else {
-        // Steps are in the depth texture resolution
-        vec2 depthTexFragPixelPos = fragUVPos * sideDepthSize;
+        } else {
+            // Steps are in the depth texture resolution
+            vec2 depthTexFragPixelPos = fragUVPos * sideDepthSize;
 
-        randomPatternRotationAngle = getAngleDitheringPixelPos(fragPixelPos) + getAngleDitheringSplit();
+            randomPatternRotationAngle = getAngleDitheringPixelPos(fragPixelPos) + getAngleDitheringSplit();
 
-        for (int i = 0; i < numSamples; ++i) {
-            vec3 tap = getTapLocationClampedSSAO(i, randomPatternRotationAngle, diskPixelRadius, depthTexFragPixelPos, sideDepthSize);
-            vec2 tapUV = fragUVPos + tap.xy * deltaDepthUV;
-            vec2 tapMipZ = fetchTap(side, tapUV, tap.z);
-            vec3 tapPositionES = evalEyePositionFromZeye(side.x, tapMipZ.y, tapUV);
-            obscuranceSum += float(tap.z > 0.0) * evalVisibilitySSAO(fragPositionES, fragNormalES, tapPositionES);
+            for (int i = 0; i < numSamples; ++i) {
+                vec3 tap = getTapLocationClampedSSAO(i, randomPatternRotationAngle, diskPixelRadius, depthTexFragPixelPos, sideDepthSize);
+                vec2 tapUV = fragUVPos + tap.xy * deltaDepthUV;
+                vec2 tapMipZ = fetchTap(side, tapUV, tap.z);
+                vec3 tapPositionES = evalEyePositionFromZeye(side.x, tapMipZ.y, tapUV);
+                obscuranceSum += float(tap.z > 0.0) * evalVisibilitySSAO(fragPositionES, fragNormalES, tapPositionES);
+            }
+            obscuranceSum *= invNumSamples;
+            obscuranceSum = 1.0 - obscuranceSum * getObscuranceScaling();
         }
-        obscuranceSum *= invNumSamples;
-        obscuranceSum = 1.0 - obscuranceSum * getObscuranceScaling();
-    }
 
-    float occlusion = clamp(obscuranceSum, 0.0, 1.0);
-    
+        occlusion = clamp(obscuranceSum, 0.0, 1.0);
+    }
     outFragColor = packOcclusionOutput(occlusion, fragPositionES.z, fragNormalES);
 }