struct GlobalUniforms {
    float4x4 matrixWStoVS;
    float4x4 matrixVStoCS;
    float2x3 matrixSSPXtoCS;

    uint pointLightCount;
    uint directionalLightCount;
    float3 ambientLight;
}

struct PointLight {
    float3 positionWS;
    float3 color;

    IncomingLight getIncoming(float4x4 matrixWStoVS, float3 positionVS) {
        IncomingLight light;

        let lightPositionVS = mul(matrixWStoVS, float4(positionWS, 1.0)).xyz;
        let lightDirectionVS = normalize(lightPositionVS - positionVS);
        let lightDistance = distance(positionVS, lightPositionVS);
        let lightAttenuation = 1.0 / (lightDistance * lightDistance);
        let incomingRadiance = color * lightAttenuation;

        light.radiance = incomingRadiance;
        light.directionVS = lightDirectionVS;
        return light;
    }
}

struct DirectionalLight {
    float3 directionWS;
    float3 color;

    IncomingLight getIncoming(float4x4 matrixWStoVS) {
        IncomingLight light;

        light.radiance = color;
        light.directionVS = normalize(mul(matrixWStoVS, float4(-directionWS, 0.0)).xyz);
        return light;
    }
}

struct Material {
    float3 baseColor;
    float3 emissive;
    float ior;
    float metallic;
    float normalScale;
    float occlusionTextureStrength;
    float roughness;

    uint16_t baseColorTexture;
    uint16_t emissiveTexture;
    uint16_t normalTexture;
    uint16_t occlusionRoughnessMetallicTexture;
}

struct ObjectUniforms {
    float4x4 matrixOStoWS;
    float4x4 matrixOStoWSNormal;

    uint16_t material;
}

struct Surface {
    float3 baseColor;
    float alpha;
    float metallic;
    float3 f0;

    __init(float3 baseColor, float alpha, float metallic, float3 f0) {
        this.baseColor = baseColor;
        this.alpha = alpha;
        this.metallic = metallic;
        this.f0 = f0;
    }
}

struct IncomingLight {
    float3 radiance;
    float3 directionVS;
}