Prevent 'warning X4000: use of potentially uninitialized variable' console message cause by early return statment in glsl shadow code

src/renderers/shaders/ShaderChunk/shadowmap_pars_fragment.glsl

@@ -59,6 +59,8 @@
 
 	float getShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord ) {
 
+		float shadow = 1.0;
+
 		shadowCoord.xyz /= shadowCoord.w;
 		shadowCoord.z += shadowBias;
 
@@ -83,7 +85,7 @@
 			float dx1 = + texelSize.x * shadowRadius;
 			float dy1 = + texelSize.y * shadowRadius;
 
-			return (
+			shadow = (
 				texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +
 				texture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +
 				texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +
@@ -104,7 +106,7 @@
 			float dx1 = + texelSize.x * shadowRadius;
 			float dy1 = + texelSize.y * shadowRadius;
 
-			return (
+			shadow = (
 				texture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +
 				texture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +
 				texture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +
@@ -118,13 +120,13 @@
 
 		#else // no percentage-closer filtering:
 
-			return texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z );
+			shadow = texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z );
 
 		#endif
 
 		}
 
-		return 1.0;
+		return shadow;
 
 	}