getPosViewSpace(texture2D(uTex0, _screenCoord.xy).r, _screenCoord.xy * uScreen.xy, z_info, v1, matProj, ssao_vp);
    getPosViewSpace(texture2D(uTex0, _screenCoord.xy + vec2(out_dim.z, 0)).r, _screenCoord.xy * uScreen.xy + vec2(1, 0), z_info, v2, matProj, ssao_vp);
    getPosViewSpace(texture2D(uTex0, _screenCoord.xy + vec2(0,out_dim.w)).r, _screenCoord.xy * uScreen.xy + vec2(0, 1), z_info, v3, matProj, ssao_vp);