<!
//  Material.slh
//  fragment shader
//
//  Created by Sam Gateau on 12/16/14.
//  Copyright 2013 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
!>
<@if not MODEL_MATERIAL_SLH@>
<@def MODEL_MATERIAL_SLH@>

// The material values (at least the material key) must be precisely bitwise accurate
// to what is provided by the uniform buffer, or the material key has the wrong bits

struct Material {
    vec4 _emissiveOpacity;
    vec4 _albedoRoughness;
    vec4 _fresnelMetallic;
    vec4 _scatteringSpare2Key;
};

uniform materialBuffer {
    Material _mat;
};

Material getMaterial() {
    return _mat;
}

vec3 getMaterialEmissive(Material m) { return m._emissiveOpacity.rgb; }
float getMaterialOpacity(Material m) { return m._emissiveOpacity.a; }

vec3 getMaterialAlbedo(Material m) { return m._albedoRoughness.rgb; }
float getMaterialRoughness(Material m) { return m._albedoRoughness.a; }

vec3 getMaterialFresnel(Material m) { return m._fresnelMetallic.rgb; }
float getMaterialMetallic(Material m) { return m._fresnelMetallic.a; }

float getMaterialShininess(Material m) { return 1.0 - getMaterialRoughness(m); }

float getMaterialScattering(Material m) { return m._scatteringSpare2Key.x; }

BITFIELD getMaterialKey(Material m) { return floatBitsToInt(m._scatteringSpare2Key.w); }

const BITFIELD EMISSIVE_VAL_BIT              = 0x00000001;
const BITFIELD UNLIT_VAL_BIT                 = 0x00000002;
const BITFIELD ALBEDO_VAL_BIT                = 0x00000004;
const BITFIELD METALLIC_VAL_BIT              = 0x00000008;
const BITFIELD GLOSSY_VAL_BIT                = 0x00000010;
const BITFIELD OPACITY_VAL_BIT               = 0x00000020;
const BITFIELD OPACITY_MASK_MAP_BIT          = 0x00000040;
const BITFIELD OPACITY_TRANSLUCENT_MAP_BIT   = 0x00000080;
const BITFIELD SCATTERING_VAL_BIT            = 0x00000100;


const BITFIELD EMISSIVE_MAP_BIT              = 0x00000200;
const BITFIELD ALBEDO_MAP_BIT                = 0x00000400;
const BITFIELD METALLIC_MAP_BIT              = 0x00000800;
const BITFIELD ROUGHNESS_MAP_BIT             = 0x00001000;
const BITFIELD NORMAL_MAP_BIT                = 0x00002000;
const BITFIELD OCCLUSION_MAP_BIT             = 0x00004000;
const BITFIELD LIGHTMAP_MAP_BIT              = 0x00008000;
const BITFIELD SCATTERING_MAP_BIT            = 0x00010000;

<@endif@>