merge from viewer2.

1 files changed, 7 insertions, 2 deletions

diff --git a/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl b/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl
index 3e8fdfb3e4..da49e59b89 100644
--- a/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl
+++ b/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl
@@ -12,7 +12,8 @@ float calcDirectionalLight(vec3 n, vec3 l)
 	return a;
 }
 
-float calcPointLight(vec3 v, vec3 n, vec4 lp, float la)
+
+float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, float is_pointlight)
 {
 	//get light vector
 	vec3 lv = lp.xyz-v;
@@ -26,9 +27,13 @@ float calcPointLight(vec3 v, vec3 n, vec4 lp, float la)
 	//distance attenuation
 	float da = clamp(1.0/(la * d), 0.0, 1.0);
 	
+	// spotlight coefficient.
+	float spot = max(dot(-ln, lv), is_pointlight);
+	da *= spot*spot; // GL_SPOT_EXPONENT=2
+
 	//angular attenuation
 	da *= calcDirectionalLight(n, lv);
-	
+
 	return da;	
 }