blender/intern/cycles/kernel/closure/bsdf_diffuse_ramp.h
Thomas Dinges c15b13f78f Cycles / Ramp closures:
* Fix crash with negative values in Phong Ramp, and add some checks to survive INF and NAN values. 

Patch by Brecht and myself.
2013-06-27 16:08:06 +00:00

99 lines
3.6 KiB
C

/*
* Adapted from Open Shading Language with this license:
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#ifndef __BSDF_DIFFUSE_RAMP_H__
#define __BSDF_DIFFUSE_RAMP_H__
CCL_NAMESPACE_BEGIN
__device float3 bsdf_diffuse_ramp_get_color(const ShaderClosure *sc, const float3 colors[8], float pos)
{
int MAXCOLORS = 8;
float npos = pos * (float)(MAXCOLORS - 1);
int ipos = float_to_int(npos);
if (ipos < 0)
return colors[0];
if (ipos >= (MAXCOLORS - 1))
return colors[MAXCOLORS - 1];
float offset = npos - (float)ipos;
return colors[ipos] * (1.0f - offset) + colors[ipos+1] * offset;
}
__device int bsdf_diffuse_ramp_setup(ShaderClosure *sc)
{
sc->type = CLOSURE_BSDF_DIFFUSE_RAMP_ID;
return SD_BSDF | SD_BSDF_HAS_EVAL;
}
__device void bsdf_diffuse_ramp_blur(ShaderClosure *sc, float roughness)
{
}
__device float3 bsdf_diffuse_ramp_eval_reflect(const ShaderClosure *sc, const float3 colors[8], const float3 I, const float3 omega_in, float *pdf)
{
float3 N = sc->N;
float cos_pi = fmaxf(dot(N, omega_in), 0.0f);
*pdf = cos_pi * M_1_PI_F;
return bsdf_diffuse_ramp_get_color(sc, colors, cos_pi) * M_1_PI_F;
}
__device float3 bsdf_diffuse_ramp_eval_transmit(const ShaderClosure *sc, const float3 colors[8], const float3 I, const float3 omega_in, float *pdf)
{
return make_float3(0.0f, 0.0f, 0.0f);
}
__device int bsdf_diffuse_ramp_sample(const ShaderClosure *sc, const float3 colors[8], float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
{
float3 N = sc->N;
// distribution over the hemisphere
sample_cos_hemisphere(N, randu, randv, omega_in, pdf);
if(dot(Ng, *omega_in) > 0.0f) {
*eval = bsdf_diffuse_ramp_get_color(sc, colors, *pdf * M_PI_F) * M_1_PI_F;
#ifdef __RAY_DIFFERENTIALS__
*domega_in_dx = (2 * dot(N, dIdx)) * N - dIdx;
*domega_in_dy = (2 * dot(N, dIdy)) * N - dIdy;
#endif
}
else
*pdf = 0.0f;
return LABEL_REFLECT|LABEL_DIFFUSE;
}
CCL_NAMESPACE_END
#endif /* __BSDF_DIFFUSE_RAMP_H__ */