bsdf_reflection.h

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/* 
 * Adapted from Open Shading Language with this license: 
 * 
 * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al. 
 * All Rights Reserved. 
 * 
 * Modifications Copyright 2011, Blender Foundation. 
 *  
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are 
 * met: 
 * * Redistributions of source code must retain the above copyright 
 *   notice, this list of conditions and the following disclaimer. 
 * * Redistributions in binary form must reproduce the above copyright 
 *   notice, this list of conditions and the following disclaimer in the 
 *   documentation and/or other materials provided with the distribution. 
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 *   contributors may be used to endorse or promote products derived from 
 *   this software without specific prior written permission. 
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*/

#ifndef __BSDF_REFLECTION_H__
#define __BSDF_REFLECTION_H__

CCL_NAMESPACE_BEGIN

/* REFLECTION */

typedef struct BsdfReflectionClosure {
    //float3 m_N;
} BsdfReflectionClosure;

__device void bsdf_reflection_setup(ShaderData *sd, ShaderClosure *sc)
{
    sc->type = CLOSURE_BSDF_REFLECTION_ID;
    sd->flag |= SD_BSDF;
}

__device void bsdf_reflection_blur(ShaderClosure *sc, float roughness)
{
}

__device float3 bsdf_reflection_eval_reflect(const ShaderData *sd, const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
    return make_float3(0.0f, 0.0f, 0.0f);
}

__device float3 bsdf_reflection_eval_transmit(const ShaderData *sd, const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
    return make_float3(0.0f, 0.0f, 0.0f);
}

__device float bsdf_reflection_albedo(const ShaderData *sd, const ShaderClosure *sc, const float3 I)
{
    return 1.0f;
}

__device int bsdf_reflection_sample(const ShaderData *sd, const ShaderClosure *sc, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
{
    //const BsdfReflectionClosure *self = (const BsdfReflectionClosure*)sc->data;
    float3 m_N = sd->N;

    // only one direction is possible
    float cosNO = dot(m_N, sd->I);
    if(cosNO > 0) {
        *omega_in = (2 * cosNO) * m_N - sd->I;
        if(dot(sd->Ng, *omega_in) > 0) {
#ifdef __RAY_DIFFERENTIALS__
            *domega_in_dx = 2 * dot(m_N, sd->dI.dx) * m_N - sd->dI.dx;
            *domega_in_dy = 2 * dot(m_N, sd->dI.dy) * m_N - sd->dI.dy;
#endif
            *pdf = 1;
            *eval = make_float3(1, 1, 1);
        }
    }
    return LABEL_REFLECT|LABEL_SINGULAR;
}

CCL_NAMESPACE_END

#endif /* __BSDF_REFLECTION_H__ */