Import Beq Janus's changes for improved preview lighting

indra/newview/app_settings/shaders/class1/objects/previewV.glsl

@@ -91,8 +91,8 @@ void main()
 
 	// Collect normal lights (need to be divided by two, as we later multiply by 2)
 	col.rgb += light_diffuse[1].rgb * calcDirectionalLight(norm, light_position[1].xyz);
-	col.rgb += light_diffuse[2].rgb*calcPointLightOrSpotLight(pos.xyz, norm, light_position[2], light_direction[2], light_attenuation[2].x, light_attenuation[2].z);
-	col.rgb += light_diffuse[3].rgb*calcPointLightOrSpotLight(pos.xyz, norm, light_position[3], light_direction[3], light_attenuation[3].x, light_attenuation[3].z);
-		
+	col.rgb += light_diffuse[2].rgb * calcDirectionalLight(norm, light_position[2].xyz);
+	col.rgb += light_diffuse[3].rgb * calcDirectionalLight(norm, light_position[3].xyz);
+	col /= 2.0;
 	vertex_color = col*color;
 }

indra/newview/pipeline.cpp

@@ -6099,7 +6099,7 @@ void LLPipeline::enableLightsPreview()
 	light->enable();
 	light->setPosition(light_pos);
 	light->setDiffuse(diffuse0);
-	light->setAmbient(LLColor4::black);
+	light->setAmbient(ambient);
 	light->setSpecular(specular0);
 	light->setSpotExponent(0.f);
 	light->setSpotCutoff(180.f);
@@ -6110,7 +6110,7 @@ void LLPipeline::enableLightsPreview()
 	light->enable();
 	light->setPosition(light_pos);
 	light->setDiffuse(diffuse1);
-	light->setAmbient(LLColor4::black);
+	light->setAmbient(ambient);
 	light->setSpecular(specular1);
 	light->setSpotExponent(0.f);
 	light->setSpotCutoff(180.f);
@@ -6120,7 +6120,7 @@ void LLPipeline::enableLightsPreview()
 	light->enable();
 	light->setPosition(light_pos);
 	light->setDiffuse(diffuse2);
-	light->setAmbient(LLColor4::black);
+	light->setAmbient(ambient);
 	light->setSpecular(specular2);
 	light->setSpotExponent(0.f);
 	light->setSpotCutoff(180.f);