SH-2681 Fix for shader compiler error on GLSL 1.30 and later

indra/llrender/llshadermgr.cpp

@@ -618,7 +618,7 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 		//backwards compatibility with legacy texture lookup syntax
 		text[count++] = strdup("#define textureCube texture\n");
 		text[count++] = strdup("#define texture2DLod textureLod\n");
-		text[count++] = strdup("#define	shadow2D texture\n");
+		text[count++] = strdup("#define	shadow2D(a,b) vec2(texture(a,b))\n");
 	}
 
 	//copy preprocessor definitions into buffer

indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl

@@ -150,7 +150,7 @@ float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
 	stc.xyz /= stc.w;
 	stc.z += spot_shadow_bias*scl;
 	
-	float cs = shadow2D(shadowMap, stc.xyz);
+	float cs = shadow2D(shadowMap, stc.xyz).x;
 	float shadow = cs;
 
 	vec2 off = 1.5/proj_shadow_res;