// Copyright 2025 DeepMind Technologies Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

material {
    name : pbr,
    shadingModel : lit,
    culling: none,
    flipUV: false,
    parameters : [
        { type : sampler2d, name : BaseColor },
        { type : sampler2d, name : Normal },
        { type : sampler2d, name : Occlusion },
        { type : sampler2d, name : Roughness },
        { type : sampler2d, name : Metallic },
        { type : sampler2d, name : Emissive },
        { type : float4, name : BaseColorFactor },
        { type : float, name : MetallicFactor },
        { type : float, name : RoughnessFactor }

    ],
    requires : [
        uv0
    ]
}

fragment {
  void material(inout MaterialInputs material) {
    vec2 uv = getUV0();

    material.normal = texture(materialParams_Normal, uv).xyz * 2.0 - 1.0;
    prepareMaterial(material);

    material.baseColor        = materialParams.BaseColorFactor;
    material.baseColor        *= texture(materialParams_BaseColor, uv);
    material.ambientOcclusion = texture(materialParams_Occlusion, uv).r;
    material.roughness        = materialParams.RoughnessFactor;
    material.roughness        *= texture(materialParams_Roughness, uv).r;
    material.metallic         = materialParams.MetallicFactor;
    material.metallic         *= texture(materialParams_Metallic, uv).r;
    material.emissive         = texture(materialParams_Emissive, uv);
    material.emissive.a       = 1.0 - material.emissive.a;
  }
}