diff options
Diffstat (limited to 'intern/cycles/kernel/closure/volume.h')
| -rw-r--r-- | intern/cycles/kernel/closure/volume.h | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/intern/cycles/kernel/closure/volume.h b/intern/cycles/kernel/closure/volume.h index 4d71ba50ec3..01e67c7c2fd 100644 --- a/intern/cycles/kernel/closure/volume.h +++ b/intern/cycles/kernel/closure/volume.h @@ -19,6 +19,12 @@ CCL_NAMESPACE_BEGIN +typedef ccl_addr_space struct HenyeyGreensteinVolume { + SHADER_CLOSURE_BASE; + + float g; +} HenyeyGreensteinVolume; + /* HENYEY-GREENSTEIN CLOSURE */ /* Given cosine between rays, return probability density that a photon bounces @@ -29,19 +35,28 @@ ccl_device float single_peaked_henyey_greenstein(float cos_theta, float g) return ((1.0f - g * g) / safe_powf(1.0f + g * g - 2.0f * g * cos_theta, 1.5f)) * (M_1_PI_F * 0.25f); }; -ccl_device int volume_henyey_greenstein_setup(ShaderClosure *sc) +ccl_device int volume_henyey_greenstein_setup(HenyeyGreensteinVolume *volume) { - sc->type = CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID; + volume->type = CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID; /* clamp anisotropy to avoid delta function */ - sc->data0 = signf(sc->data0) * min(fabsf(sc->data0), 1.0f - 1e-3f); + volume->g = signf(volume->g) * min(fabsf(volume->g), 1.0f - 1e-3f); return SD_SCATTER; } +ccl_device bool volume_henyey_greenstein_merge(const ShaderClosure *a, const ShaderClosure *b) +{ + const HenyeyGreensteinVolume *volume_a = (const HenyeyGreensteinVolume*)a; + const HenyeyGreensteinVolume *volume_b = (const HenyeyGreensteinVolume*)b; + + return (volume_a->g == volume_b->g); +} + ccl_device float3 volume_henyey_greenstein_eval_phase(const ShaderClosure *sc, const float3 I, float3 omega_in, float *pdf) { - float g = sc->data0; + const HenyeyGreensteinVolume *volume = (const HenyeyGreensteinVolume*)sc; + float g = volume->g; /* note that I points towards the viewer */ if(fabsf(g) < 1e-3f) { @@ -58,7 +73,8 @@ ccl_device float3 volume_henyey_greenstein_eval_phase(const ShaderClosure *sc, c ccl_device int volume_henyey_greenstein_sample(const ShaderClosure *sc, 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) { - float g = sc->data0; + const HenyeyGreensteinVolume *volume = (const HenyeyGreensteinVolume*)sc; + float g = volume->g; float cos_phi, sin_phi, cos_theta; /* match pdf for small g */ |