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jstone-lucasfilmjstone-lucasfilm
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Restrict optimized BSDF graphs to hardware targets (#2539)
This changelist restricts the optimized BSDF graphs for Standard Surface, glTF PBR, and OpenPBR Surface to hardware shading targets, falling back to the original unoptimized graphs on other targets. The optimized graphs now live within a `libraries/bxdf/genglsl` folder with a `glsl` target assignment, and the generic graphs in `libraries/bxdf` have been restored to their pre-optimized versions. In the future, we're hoping to move in the direction of automated optimization of shading model graphs, which would allow each renderer to opt in or out of this category of optimization through GenOptions settings.
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‎libraries/bxdf/genglsl/gltf_pbr.mtlx‎

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<?xml version="1.0"?>
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<materialx version="1.39">
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<!-- An optimized graph implementation for hardware shading languages,
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improving the effectiveness of dynamic branches. -->
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<nodegraph name="IMPL_gltf_pbr_surfaceshader_optim" nodedef="ND_gltf_pbr_surfaceshader" target="genglsl">
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<!-- Volume -->
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<convert name="attenuation_color_vec" type="vector3">
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<input name="in" type="color3" interfacename="attenuation_color" />
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</convert>
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<ln name="ln_attenuation_color_vec" type="vector3">
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<input name="in" type="vector3" nodename="attenuation_color_vec" />
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</ln>
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<divide name="ln_attenuation_color_vec_over_distance" type="vector3">
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<input name="in1" type="vector3" nodename="ln_attenuation_color_vec" />
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<input name="in2" type="float" interfacename="attenuation_distance" />
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</divide>
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<multiply name="attenuation_coeff" type="vector3">
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<input name="in1" type="vector3" nodename="ln_attenuation_color_vec_over_distance" />
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<input name="in2" type="float" value="-1" />
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</multiply>
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<anisotropic_vdf name="isotropic_volume" type="VDF">
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<!-- No scattering yet, so absorption_coeff == attenuation_coeff -->
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<input name="absorption" type="vector3" nodename="attenuation_coeff" />
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<input name="scattering" type="vector3" value="0, 0, 0" />
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<input name="anisotropy" type="float" value="0" />
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</anisotropic_vdf>
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<!-- Base layer -->
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<!-- Compute F0 and F90 of dielectric component -->
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<subtract name="one_minus_ior" type="float">
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<input name="in1" type="float" value="1" />
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<input name="in2" type="float" interfacename="ior" />
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</subtract>
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<add name="one_plus_ior" type="float">
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<input name="in1" type="float" value="1" />
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<input name="in2" type="float" interfacename="ior" />
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</add>
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<divide name="ior_div" type="float">
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<input name="in1" type="float" nodename="one_minus_ior" />
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<input name="in2" type="float" nodename="one_plus_ior" />
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</divide>
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<multiply name="dielectric_f0_from_ior" type="float">
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<input name="in1" type="float" nodename="ior_div" />
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<input name="in2" type="float" nodename="ior_div" />
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</multiply>
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<multiply name="dielectric_f0_from_ior_specular_color" type="color3">
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<input name="in1" type="color3" interfacename="specular_color" />
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<input name="in2" type="float" nodename="dielectric_f0_from_ior" />
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</multiply>
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<min name="clamped_dielectric_f0_from_ior_specular_color" type="color3">
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<input name="in1" type="color3" nodename="dielectric_f0_from_ior_specular_color" />
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<input name="in2" type="float" value="1" />
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</min>
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<multiply name="dielectric_f0" type="color3">
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<input name="in1" type="color3" nodename="clamped_dielectric_f0_from_ior_specular_color" />
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<input name="in2" type="float" interfacename="specular" />
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</multiply>
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<multiply name="dielectric_f90" type="color3">
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<input name="in1" type="color3" value="1, 1, 1" />
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<input name="in2" type="float" interfacename="specular" />
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</multiply>
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<!-- Roughness -->
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<combine2 name="roughness_uv" type="vector2">
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<input name="in1" type="float" nodename="clamped_at" />
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<input name="in2" type="float" nodename="clamped_ab" />
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</combine2>
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<clamp name="clamped_at" type="float">
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<input name="in" type="float" nodename="at" />
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<input name="low" type="float" value="0.00001" />
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<input name="high" type="float" value="1.0" />
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</clamp>
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<clamp name="clamped_ab" type="float">
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<input name="in" type="float" nodename="alpha_roughness" />
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<input name="low" type="float" value="0.00001" />
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<input name="high" type="float" value="1.0" />
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</clamp>
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<multiply name="alpha_roughness" type="float">
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<input name="in1" type="float" interfacename="roughness" />
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<input name="in2" type="float" interfacename="roughness" />
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</multiply>
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<multiply name="strength_2" type="float">
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<input name="in1" type="float" interfacename="anisotropy_strength" />
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<input name="in2" type="float" interfacename="anisotropy_strength" />
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</multiply>
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<mix name="at" type="float">
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<input name="fg" type="float" value="1" />
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<input name="bg" type="float" nodename="alpha_roughness" />
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<input name="mix" type="float" nodename="strength_2" />
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</mix>
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<!-- Dielectric -->
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<invert name="transmission_inv" type="float">
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<input name="in" type="float" interfacename="transmission" />
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</invert>
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<oren_nayar_diffuse_bsdf name="diffuse_bsdf" type="BSDF">
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<input name="weight" type="float" nodename="transmission_inv" />
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<input name="color" type="color3" interfacename="base_color" />
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<input name="normal" type="vector3" interfacename="normal" />
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</oren_nayar_diffuse_bsdf>
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<dielectric_bsdf name="transmission_bsdf" type="BSDF">
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<input name="weight" type="float" interfacename="transmission" />
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<input name="tint" type="color3" interfacename="base_color" />
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<input name="ior" type="float" interfacename="ior" />
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<input name="roughness" type="vector2" nodename="roughness_uv" />
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<input name="normal" type="vector3" interfacename="normal" />
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<input name="tangent" type="vector3" nodename="selected_tangent" />
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<input name="scatter_mode" type="string" value="T" />
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</dielectric_bsdf>
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<add name="transmission_blend" type="BSDF">
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<input name="in1" type="BSDF" nodename="diffuse_bsdf" />
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<input name="in2" type="BSDF" nodename="transmission_bsdf" />
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</add>
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<invert name="iridescence_inv" type="float">
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<input name="in" type="float" interfacename="iridescence" />
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</invert>
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<generalized_schlick_bsdf name="reflection_bsdf" type="BSDF">
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<input name="weight" type="float" nodename="iridescence_inv" />
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<input name="color0" type="color3" nodename="dielectric_f0" />
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<input name="color90" type="color3" nodename="dielectric_f90" />
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<input name="roughness" type="vector2" nodename="roughness_uv" />
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<input name="normal" type="vector3" interfacename="normal" />
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<input name="tangent" type="vector3" nodename="selected_tangent" />
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<input name="scatter_mode" type="string" value="R" />
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</generalized_schlick_bsdf>
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<generalized_schlick_bsdf name="reflection_bsdf_tf" type="BSDF">
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<input name="weight" type="float" interfacename="iridescence" />
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<input name="color0" type="color3" nodename="dielectric_f0" />
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<input name="color90" type="color3" nodename="dielectric_f90" />
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<input name="roughness" type="vector2" nodename="roughness_uv" />
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<input name="normal" type="vector3" interfacename="normal" />
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<input name="tangent" type="vector3" nodename="selected_tangent" />
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<input name="scatter_mode" type="string" value="R" />
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<input name="thinfilm_thickness" type="float" interfacename="iridescence_thickness" />
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<input name="thinfilm_ior" type="float" interfacename="iridescence_ior" />
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</generalized_schlick_bsdf>
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<add name="reflection_bsdf_blend" type="BSDF">
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<input name="in1" type="BSDF" nodename="reflection_bsdf" />
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<input name="in2" type="BSDF" nodename="reflection_bsdf_tf" />
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</add>
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<layer name="dielectric_layer" type="BSDF">
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<input name="top" type="BSDF" nodename="reflection_bsdf_blend" />
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<input name="base" type="BSDF" nodename="transmission_blend" />
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</layer>
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<!-- Metal -->
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<generalized_schlick_bsdf name="metal_bsdf" type="BSDF">
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<input name="weight" type="float" nodename="iridescence_inv" />
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<input name="color0" type="color3" interfacename="base_color" />
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<input name="color90" type="color3" value="1, 1, 1" />
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<input name="roughness" type="vector2" nodename="roughness_uv" />
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<input name="normal" type="vector3" interfacename="normal" />
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<input name="tangent" type="vector3" nodename="selected_tangent" />
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</generalized_schlick_bsdf>
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<generalized_schlick_bsdf name="metal_bsdf_tf" type="BSDF">
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<input name="weight" type="float" interfacename="iridescence" />
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<input name="color0" type="color3" interfacename="base_color" />
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<input name="color90" type="color3" value="1, 1, 1" />
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<input name="roughness" type="vector2" nodename="roughness_uv" />
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<input name="normal" type="vector3" interfacename="normal" />
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<input name="tangent" type="vector3" nodename="selected_tangent" />
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<input name="thinfilm_thickness" type="float" interfacename="iridescence_thickness" />
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<input name="thinfilm_ior" type="float" interfacename="iridescence_ior" />
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</generalized_schlick_bsdf>
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<add name="metal_blend" type="BSDF">
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<input name="in1" type="BSDF" nodename="metal_bsdf" />
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<input name="in2" type="BSDF" nodename="metal_bsdf_tf" />
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</add>
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<!-- Dielectric/metal mix -->
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<mix name="base_mix" type="BSDF">
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<input name="bg" type="BSDF" nodename="dielectric_layer" />
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<input name="fg" type="BSDF" nodename="metal_blend" />
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<input name="mix" type="float" interfacename="metallic" />
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</mix>
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<!-- Sheen layer -->
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<!-- Compute sheen intensity = max(sheen_color.r, sheen_color.g, sheen_color.b) -->
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<extract name="sheen_color_r" type="float">
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<input name="in" type="color3" interfacename="sheen_color" />
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<input name="index" type="integer" value="0" />
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</extract>
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<extract name="sheen_color_g" type="float">
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<input name="in" type="color3" interfacename="sheen_color" />
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<input name="index" type="integer" value="1" />
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</extract>
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<extract name="sheen_color_b" type="float">
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<input name="in" type="color3" interfacename="sheen_color" />
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<input name="index" type="integer" value="2" />
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</extract>
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<max name="sheen_color_max_rg" type="float">
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<input name="in1" type="float" nodename="sheen_color_r" />
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<input name="in2" type="float" nodename="sheen_color_g" />
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</max>
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<max name="sheen_intensity" type="float">
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<input name="in1" type="float" nodename="sheen_color_max_rg" />
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<input name="in2" type="float" nodename="sheen_color_b" />
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</max>
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<multiply name="sheen_roughness_sq" type="float">
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<input name="in1" type="float" interfacename="sheen_roughness" />
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<input name="in2" type="float" interfacename="sheen_roughness" />
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</multiply>
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<divide name="sheen_color_normalized" type="color3">
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<input name="in1" type="color3" interfacename="sheen_color" />
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<input name="in2" type="float" nodename="sheen_intensity" />
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</divide>
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<sheen_bsdf name="sheen_bsdf" type="BSDF">
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<input name="weight" type="float" nodename="sheen_intensity" />
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<input name="color" type="color3" nodename="sheen_color_normalized" />
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<input name="roughness" type="float" nodename="sheen_roughness_sq" />
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<input name="normal" type="vector3" interfacename="normal" />
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</sheen_bsdf>
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<layer name="sheen_layer" type="BSDF">
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<input name="top" type="BSDF" nodename="sheen_bsdf" />
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<input name="base" type="BSDF" nodename="base_mix" />
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</layer>
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<!-- Clearcoat -->
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<roughness_anisotropy name="clearcoat_roughness_uv" type="vector2">
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<input name="roughness" type="float" interfacename="clearcoat_roughness" />
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</roughness_anisotropy>
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<dielectric_bsdf name="clearcoat_bsdf" type="BSDF">
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<input name="weight" type="float" interfacename="clearcoat" />
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<input name="roughness" type="vector2" nodename="clearcoat_roughness_uv" />
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<input name="ior" type="float" value="1.5" />
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<input name="normal" type="vector3" interfacename="clearcoat_normal" />
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<input name="tangent" type="vector3" interfacename="tangent" />
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</dielectric_bsdf>
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<layer name="clearcoat_layer" type="BSDF">
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<input name="top" type="BSDF" nodename="clearcoat_bsdf" />
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<input name="base" type="BSDF" nodename="sheen_layer" />
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</layer>
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<!-- Emission -->
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<multiply name="emission_color" type="color3">
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<input name="in1" type="color3" interfacename="emissive" />
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<input name="in2" type="float" interfacename="emissive_strength" />
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</multiply>
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<uniform_edf name="emission" type="EDF">
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<input name="color" type="color3" nodename="emission_color" />
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</uniform_edf>
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<!-- Alpha -->
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<ifgreatereq name="opacity_mask_cutoff" type="float">
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<input name="value1" type="float" interfacename="alpha" />
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<input name="value2" type="float" interfacename="alpha_cutoff" />
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<input name="in1" type="float" value="1" />
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<input name="in2" type="float" value="0" />
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</ifgreatereq>
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<ifequal name="opacity_mask" type="float">
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<input name="value1" type="integer" interfacename="alpha_mode" />
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<input name="value2" type="integer" value="1" />
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<input name="in1" type="float" nodename="opacity_mask_cutoff" />
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<input name="in2" type="float" interfacename="alpha" />
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</ifequal>
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<ifequal name="opacity" type="float">
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<input name="value1" type="integer" interfacename="alpha_mode" />
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<input name="value2" type="integer" value="0" />
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<input name="in1" type="float" value="1" />
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<input name="in2" type="float" nodename="opacity_mask" />
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</ifequal>
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<!-- Anisotropy -->
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<multiply name="rad_2_deg" type="float">
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<input name="in1" type="float" interfacename="anisotropy_rotation" />
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<input name="in2" type="float" value="-57.295780" />
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</multiply>
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<rotate3d name="rotate_tangent" type="vector3">
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<input name="in" type="vector3" interfacename="tangent" />
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<input name="amount" type="float" nodename="rad_2_deg" />
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<input name="axis" type="vector3" interfacename="normal" />
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</rotate3d>
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<normalize name="normalize_tangent" type="vector3">
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<input name="in" type="vector3" nodename="rotate_tangent" />
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</normalize>
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<absval name="abs_anisotropy_rotation" type="float">
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<input name="in" type="float" interfacename="anisotropy_rotation"/>
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</absval>
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<ifgreater name="selected_tangent" type="vector3">
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<input name="value1" type="float" nodename="abs_anisotropy_rotation" />
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<input name="value2" type="float" value="0.0" />
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<input name="in1" type="vector3" nodename="normalize_tangent" />
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<input name="in2" type="vector3" interfacename="tangent" />
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</ifgreater>
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<!-- Surface -->
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<surface name="shader_constructor" type="surfaceshader">
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<input name="bsdf" type="BSDF" nodename="clearcoat_layer" />
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<input name="edf" type="EDF" nodename="emission" />
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<input name="opacity" type="float" nodename="opacity" />
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</surface>
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<output name="out" type="surfaceshader" nodename="shader_constructor" />
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</nodegraph>
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</materialx>

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