sampler PBRSampler
{
    filtering anisotropic
    max_anisotropy 8
}

sampler PBRLUTSampler
{
    filtering none
    tex_address_mode clamp
}

sampler PBRIBLSampler
{
    tex_address_mode clamp
    filtering trilinear
}

sampler PBRSSAOSampler
{
    tex_address_mode clamp
    filtering none
}

abstract material Filament
{
    set $Albedo white.png
    set $AmbientOcclusion white.png
    set $Normal normal_disabled.png
    set $Emissive black.png
    set $MetalRoughness white.png
    set $BRDFLUT "dfgLUTmultiscatter.dds 2d 0"
    set $IBL_SPECULAR black.png

    technique
    {
        pass
        {
            // These are safe to override.
            texture_unit Albedo
            {
                texture $Albedo
                sampler_ref PBRSampler
            }
            texture_unit AmbientOcclusion
            {
                texture $AmbientOcclusion
                tex_coord_set 1
                sampler_ref PBRSampler
            }
            texture_unit Normal
            {
                texture $Normal
                sampler_ref PBRSampler
            }
            texture_unit Emissive
            {
                texture $Emissive
                sampler_ref PBRSampler
            }
            texture_unit MetalRoughness
            {
                texture $MetalRoughness
                sampler_ref PBRSampler
            }
            // You should not override these.
            texture_unit BRDFLUT
            {
                texture $BRDFLUT
                sampler_ref PBRLUTSampler
            }
            texture_unit IBL_SPECULAR
            {
                texture $IBL_SPECULAR cubic gamma
                sampler_ref PBRIBLSampler
            }
            texture_unit SSAO
            {
                texture $AmbientOcclusion
                tex_coord_set 1
                sampler_ref PBRSampler
            }
            /*
            texture_unit SSAO
            {
                content_type compositor SSAO/GBuffer blurred_occlusion 0
                sampler_ref PBRSSAOSampler
            }
            */

            vertex_program_ref PBR_filament_vs
            {
            }

            fragment_program_ref PBR_filament_fs
            {
                // PBR parameters
                param_named      u_BaseColorFactor          float4 1 1 1 1
                param_named      u_NormalScale              float 1
                param_named      u_EmissiveFactor           float3 1 1 1
                param_named      u_MetallicRoughnessValues  float2 1 1
                param_named      u_OcclusionStrength        float 1
            }
        }
    }
}