// 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 : phong_cube_reflect,
    shadingModel : specularGlossiness,
    flipUV : false,
    parameters : [
        { type : float4, name : BaseColorFactor },
        { type : float, name : SpecularFactor },
        { type : float, name : GlossinessFactor },
        { type : float, name : EmissiveFactor },
        { type : float3, name : UvScale },
        { type : float, name : Reflectance },
        { type : samplerCubemap, name : BaseColor },
        { type : sampler2d, name : Reflection }
    ],
    variables : [
         vertex_pos
    ]
}

vertex {
  void materialVertex(inout MaterialVertexInputs material) {
    material.vertex_pos = getPosition();
  }
}

fragment {
  void material(inout MaterialInputs material) {
    vec3 uv = variable_vertex_pos.xyz * materialParams.UvScale;
    vec2 screen_uv = gl_FragCoord.xy * getResolution().zw;

    prepareMaterial(material);
    material.baseColor     = materialParams.BaseColorFactor;
    material.baseColor     *= texture(materialParams_BaseColor, uv);
    material.specularColor = vec3(materialParams.SpecularFactor);
    material.glossiness    = materialParams.GlossinessFactor;
    material.emissive      = vec4(
        materialParams.BaseColorFactor.rgb * materialParams.EmissiveFactor, 0.0);

    // Apply reflection.
    vec4 reflection = texture(materialParams_Reflection, screen_uv);
    material.baseColor.rgb = mix(material.baseColor.rgb, reflection.rgb, materialParams.Reflectance);
  }
}