From 5aee9b74626432772415306ec1bf4de7600ab27c Mon Sep 17 00:00:00 2001
From: Ptolemy <ptolemy@lindenlab.com>
Date: Fri, 15 Jul 2022 17:22:23 -0700
Subject: [PATCH] SL-17702: PBR: Stub in light attenuation
---
.../shaders/class1/deferred/deferredUtil.glsl | 36 +++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
index e28d4f38e8f..3427f373d22 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
@@ -157,6 +157,42 @@ vec2 getGGX( vec2 brdfPoint )
#endif
}
+
+// Reference: float getRangeAttenuation(float range, float distance)
+float getLightAttenuationPointSpot(float range, float distance)
+{
+#if 1
+ return range;
+#else
+ float range2 = pow(range, 2.0);
+
+ // support negative range as unlimited
+ if (range <= 0.0)
+ {
+ return 1.0 / range2;
+ }
+
+ return max(min(1.0 - pow(distance / range, 4.0), 1.0), 0.0) / range2;
+#endif
+}
+
+vec3 getLightIntensityPoint(vec3 lightColor, float lightRange, float lightDistance)
+{
+ float rangeAttenuation = getLightAttenuationPointSpot(lightRange, lightDistance);
+ return rangeAttenuation * lightColor;
+}
+
+float getLightAttenuationSpot(vec3 spotDirection)
+{
+ return 1.0;
+}
+
+vec3 getLightIntensitySpot(vec3 lightColor, float lightRange, float lightDistance, vec3 v)
+{
+ float spotAttenuation = getLightAttenuationSpot(-v);
+ return spotAttenuation * getLightIntensityPoint( lightColor, lightRange, lightDistance );
+}
+
// NOTE: This is different from the GGX texture
float D_GGX( float nh, float alphaRough )
{
--
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