static float3 flatten_background_closure_tree(const OSL::ClosureColor *closure)
{
/* OSL gives us a closure tree, if we are shading for background there
* is only one supported closure type at the moment, which has no evaluation
* functions, so we just sum the weights */
if (closure->type == OSL::ClosureColor::COMPONENT) {
OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
if (prim && prim->category() == OSL::ClosurePrimitive::Background)
return make_float3(1.0f, 1.0f, 1.0f);
}
else if (closure->type == OSL::ClosureColor::MUL) {
OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
return TO_FLOAT3(mul->weight) * flatten_background_closure_tree(mul->closure);
}
else if (closure->type == OSL::ClosureColor::ADD) {
OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
return flatten_background_closure_tree(add->closureA) +
flatten_background_closure_tree(add->closureB);
}
return make_float3(0.0f, 0.0f, 0.0f);
}
static void flatten_volume_closure_tree(ShaderData *sd,
const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
{
/* OSL gives us a closure tree, we flatten it into arrays per
* closure type, for evaluation, sampling, etc later on. */
if (closure->type == OSL::ClosureColor::COMPONENT) {
OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
if (prim) {
ShaderClosure sc;
#ifdef OSL_SUPPORTS_WEIGHTED_CLOSURE_COMPONENTS
sc.weight = weight*TO_FLOAT3(comp->w);
#else
sc.weight = weight;
#endif
switch (prim->category()) {
case OSL::ClosurePrimitive::Volume: {
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = CLOSURE_VOLUME_ID;
sc.data0 = 0.0f;
sc.data1 = 0.0f;
sc.prim = NULL;
/* add */
if(sc.sample_weight > 1e-5f && sd->num_closure < MAX_CLOSURE)
sd->closure[sd->num_closure++] = sc;
break;
}
case OSL::ClosurePrimitive::Holdout:
case OSL::ClosurePrimitive::Debug:
break; /* not implemented */
case OSL::ClosurePrimitive::Background:
case OSL::ClosurePrimitive::BSDF:
case OSL::ClosurePrimitive::Emissive:
case OSL::ClosurePrimitive::BSSRDF:
break; /* not relevant */
}
}
}
else if (closure->type == OSL::ClosureColor::MUL) {
OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
flatten_volume_closure_tree(sd, mul->closure, TO_FLOAT3(mul->weight) * weight);
}
else if (closure->type == OSL::ClosureColor::ADD) {
OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
flatten_volume_closure_tree(sd, add->closureA, weight);
flatten_volume_closure_tree(sd, add->closureB, weight);
}
}
static void flatten_volume_closure_tree(ShaderData *sd,
const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
{
/* OSL gives use a closure tree, we flatten it into arrays per
* closure type, for evaluation, sampling, etc later on. */
if(closure->type == OSL::ClosureColor::COMPONENT) {
OSL::ClosureComponent *comp = (OSL::ClosureComponent*)closure;
OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive*)comp->data();
if(prim) {
ShaderClosure sc;
sc.prim = prim;
sc.weight = weight;
switch(prim->category()) {
case ClosurePrimitive::Volume: {
if(sd->num_closure == MAX_CLOSURE)
return;
/* sample weight */
float sample_weight = fabsf(average(weight));
float sample_sum = sd->osl_closure.volume_sample_sum + sample_weight;
sc.sample_weight = sample_weight;
sc.type = CLOSURE_VOLUME_ID;
sd->osl_closure.volume_sample_sum = sample_sum;
/* add */
sd->closure[sd->num_closure++] = sc;
break;
}
case ClosurePrimitive::Holdout:
case ClosurePrimitive::Debug:
break; /* not implemented */
case ClosurePrimitive::Background:
case ClosurePrimitive::BSDF:
case ClosurePrimitive::Emissive:
case ClosurePrimitive::BSSRDF:
break; /* not relevant */
}
}
}
else if(closure->type == OSL::ClosureColor::MUL) {
OSL::ClosureMul *mul = (OSL::ClosureMul*)closure;
flatten_volume_closure_tree(sd, mul->closure, TO_FLOAT3(mul->weight) * weight);
}
else if(closure->type == OSL::ClosureColor::ADD) {
OSL::ClosureAdd *add = (OSL::ClosureAdd*)closure;
flatten_volume_closure_tree(sd, add->closureA, weight);
flatten_volume_closure_tree(sd, add->closureB, weight);
}
}
static void flatten_surface_closure_tree(ShaderData *sd, bool no_glossy,
const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
{
/* OSL gives us a closure tree, we flatten it into arrays per
* closure type, for evaluation, sampling, etc later on. */
if (closure->type == OSL::ClosureColor::COMPONENT) {
OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
if (prim) {
ShaderClosure sc;
sc.weight = weight;
switch (prim->category()) {
case OSL::ClosurePrimitive::BSDF: {
CBSDFClosure *bsdf = (CBSDFClosure *)prim;
int scattering = bsdf->scattering();
/* no caustics option */
if (no_glossy && scattering == LABEL_GLOSSY)
return;
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = bsdf->sc.type;
sc.N = bsdf->sc.N;
sc.T = bsdf->sc.T;
sc.data0 = bsdf->sc.data0;
sc.data1 = bsdf->sc.data1;
sc.prim = bsdf->sc.prim;
/* add */
if(sc.sample_weight > 1e-5f && sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= bsdf->shaderdata_flag();
}
break;
}
case OSL::ClosurePrimitive::Emissive: {
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = CLOSURE_EMISSION_ID;
sc.prim = NULL;
/* flag */
if(sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= SD_EMISSION;
}
break;
}
case AmbientOcclusion: {
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = CLOSURE_AMBIENT_OCCLUSION_ID;
sc.prim = NULL;
if(sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= SD_AO;
}
break;
}
case OSL::ClosurePrimitive::Holdout: {
sc.sample_weight = 0.0f;
sc.type = CLOSURE_HOLDOUT_ID;
sc.prim = NULL;
if(sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= SD_HOLDOUT;
}
break;
}
case OSL::ClosurePrimitive::BSSRDF: {
CBSSRDFClosure *bssrdf = (CBSSRDFClosure *)prim;
float sample_weight = fabsf(average(weight));
if(sample_weight > 1e-5f && sd->num_closure+2 < MAX_CLOSURE) {
sc.sample_weight = sample_weight;
sc.type = bssrdf->sc.type;
sc.N = bssrdf->sc.N;
sc.data1 = bssrdf->sc.data1;
sc.prim = NULL;
/* create one closure for each color channel */
if(fabsf(weight.x) > 0.0f) {
sc.weight = make_float3(weight.x, 0.0f, 0.0f);
sc.data0 = bssrdf->radius.x;
sd->closure[sd->num_closure++] = sc;
sd->flag |= bssrdf->shaderdata_flag();
}
if(fabsf(weight.y) > 0.0f) {
sc.weight = make_float3(0.0f, weight.y, 0.0f);
sc.data0 = bssrdf->radius.y;
sd->closure[sd->num_closure++] = sc;
sd->flag |= bssrdf->shaderdata_flag();
}
if(fabsf(weight.z) > 0.0f) {
sc.weight = make_float3(0.0f, 0.0f, weight.z);
sc.data0 = bssrdf->radius.z;
sd->closure[sd->num_closure++] = sc;
sd->flag |= bssrdf->shaderdata_flag();
}
}
break;
}
case OSL::ClosurePrimitive::Debug:
break; /* not implemented */
case OSL::ClosurePrimitive::Background:
case OSL::ClosurePrimitive::Volume:
break; /* not relevant */
}
}
}
else if (closure->type == OSL::ClosureColor::MUL) {
OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
flatten_surface_closure_tree(sd, no_glossy, mul->closure, TO_FLOAT3(mul->weight) * weight);
}
else if (closure->type == OSL::ClosureColor::ADD) {
OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
flatten_surface_closure_tree(sd, no_glossy, add->closureA, weight);
flatten_surface_closure_tree(sd, no_glossy, add->closureB, weight);
}
}
static void flatten_surface_closure_tree(ShaderData *sd, bool no_glossy,
const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
{
/* OSL gives use a closure tree, we flatten it into arrays per
* closure type, for evaluation, sampling, etc later on. */
if(closure->type == OSL::ClosureColor::COMPONENT) {
OSL::ClosureComponent *comp = (OSL::ClosureComponent*)closure;
OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive*)comp->data();
if(prim) {
ShaderClosure sc;
sc.prim = prim;
sc.weight = weight;
switch(prim->category()) {
case ClosurePrimitive::BSDF: {
if(sd->num_closure == MAX_CLOSURE)
return;
OSL::BSDFClosure *bsdf = (OSL::BSDFClosure*)prim;
ustring scattering = bsdf->scattering();
/* no caustics option */
if(no_glossy && scattering == OSL::Labels::GLOSSY)
return;
/* sample weight */
float albedo = bsdf->albedo(TO_VEC3(sd->I));
float sample_weight = fabsf(average(weight))*albedo;
float sample_sum = sd->osl_closure.bsdf_sample_sum + sample_weight;
sc.sample_weight = sample_weight;
sc.type = CLOSURE_BSDF_ID;
sd->osl_closure.bsdf_sample_sum = sample_sum;
/* scattering flags */
if(scattering == OSL::Labels::DIFFUSE)
sd->flag |= SD_BSDF|SD_BSDF_HAS_EVAL;
else if(scattering == OSL::Labels::GLOSSY)
sd->flag |= SD_BSDF|SD_BSDF_HAS_EVAL|SD_BSDF_GLOSSY;
else
sd->flag |= SD_BSDF;
/* add */
sd->closure[sd->num_closure++] = sc;
break;
}
case ClosurePrimitive::Emissive: {
if(sd->num_closure == MAX_CLOSURE)
return;
/* sample weight */
float sample_weight = fabsf(average(weight));
float sample_sum = sd->osl_closure.emissive_sample_sum + sample_weight;
sc.sample_weight = sample_weight;
sc.type = CLOSURE_EMISSION_ID;
sd->osl_closure.emissive_sample_sum = sample_sum;
/* flag */
sd->flag |= SD_EMISSION;
sd->closure[sd->num_closure++] = sc;
break;
}
case ClosurePrimitive::Holdout:
if(sd->num_closure == MAX_CLOSURE)
return;
sc.sample_weight = 0.0f;
sc.type = CLOSURE_HOLDOUT_ID;
sd->flag |= SD_HOLDOUT;
sd->closure[sd->num_closure++] = sc;
break;
case ClosurePrimitive::BSSRDF:
case ClosurePrimitive::Debug:
break; /* not implemented */
case ClosurePrimitive::Background:
case ClosurePrimitive::Volume:
break; /* not relevant */
}
}
}
else if(closure->type == OSL::ClosureColor::MUL) {
OSL::ClosureMul *mul = (OSL::ClosureMul*)closure;
flatten_surface_closure_tree(sd, no_glossy, mul->closure, TO_FLOAT3(mul->weight) * weight);
}
else if(closure->type == OSL::ClosureColor::ADD) {
OSL::ClosureAdd *add = (OSL::ClosureAdd*)closure;
flatten_surface_closure_tree(sd, no_glossy, add->closureA, weight);
flatten_surface_closure_tree(sd, no_glossy, add->closureB, weight);
}
}
static void flatten_surface_closure_tree(ShaderData *sd, int path_flag,
const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
{
/* OSL gives us a closure tree, we flatten it into arrays per
* closure type, for evaluation, sampling, etc later on. */
if (closure->type == OSL::ClosureColor::COMPONENT) {
OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
if (prim) {
ShaderClosure sc;
#ifdef OSL_SUPPORTS_WEIGHTED_CLOSURE_COMPONENTS
sc.weight = weight*TO_FLOAT3(comp->w);
#else
sc.weight = weight;
#endif
switch (prim->category()) {
case OSL::ClosurePrimitive::BSDF: {
CBSDFClosure *bsdf = (CBSDFClosure *)prim;
int scattering = bsdf->scattering();
/* no caustics option */
if(scattering == LABEL_GLOSSY && (path_flag & PATH_RAY_DIFFUSE)) {
KernelGlobals *kg = sd->osl_globals;
if(kernel_data.integrator.no_caustics)
return;
}
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = bsdf->sc.type;
sc.N = bsdf->sc.N;
sc.T = bsdf->sc.T;
sc.data0 = bsdf->sc.data0;
sc.data1 = bsdf->sc.data1;
sc.prim = bsdf->sc.prim;
/* add */
if(sc.sample_weight > 1e-5f && sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= bsdf->shaderdata_flag();
}
break;
}
case OSL::ClosurePrimitive::Emissive: {
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = CLOSURE_EMISSION_ID;
sc.data0 = 0.0f;
sc.data1 = 0.0f;
sc.prim = NULL;
/* flag */
if(sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= SD_EMISSION;
}
break;
}
case AmbientOcclusion: {
/* sample weight */
float sample_weight = fabsf(average(weight));
sc.sample_weight = sample_weight;
sc.type = CLOSURE_AMBIENT_OCCLUSION_ID;
sc.data0 = 0.0f;
sc.data1 = 0.0f;
sc.prim = NULL;
if(sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= SD_AO;
}
break;
}
case OSL::ClosurePrimitive::Holdout: {
sc.sample_weight = 0.0f;
sc.type = CLOSURE_HOLDOUT_ID;
sc.data0 = 0.0f;
sc.data1 = 0.0f;
sc.prim = NULL;
if(sd->num_closure < MAX_CLOSURE) {
sd->closure[sd->num_closure++] = sc;
sd->flag |= SD_HOLDOUT;
}
break;
}
case OSL::ClosurePrimitive::BSSRDF: {
CBSSRDFClosure *bssrdf = (CBSSRDFClosure *)prim;
float sample_weight = fabsf(average(weight));
if(sample_weight > 1e-5f && sd->num_closure+2 < MAX_CLOSURE) {
sc.sample_weight = sample_weight;
sc.type = bssrdf->sc.type;
sc.N = bssrdf->sc.N;
sc.data1 = bssrdf->sc.data1;
sc.T.x = bssrdf->sc.T.x;
sc.prim = NULL;
/* disable in case of diffuse ancestor, can't see it well then and
* adds considerably noise due to probabilities of continuing path
* getting lower and lower */
if(sc.type != CLOSURE_BSSRDF_COMPATIBLE_ID && (path_flag & PATH_RAY_DIFFUSE_ANCESTOR))
bssrdf->radius = make_float3(0.0f, 0.0f, 0.0f);
/* create one closure for each color channel */
if(fabsf(weight.x) > 0.0f) {
sc.weight = make_float3(weight.x, 0.0f, 0.0f);
sc.data0 = bssrdf->radius.x;
sd->flag |= bssrdf_setup(&sc, sc.type);
sd->closure[sd->num_closure++] = sc;
}
if(fabsf(weight.y) > 0.0f) {
sc.weight = make_float3(0.0f, weight.y, 0.0f);
sc.data0 = bssrdf->radius.y;
sd->flag |= bssrdf_setup(&sc, sc.type);
sd->closure[sd->num_closure++] = sc;
}
if(fabsf(weight.z) > 0.0f) {
sc.weight = make_float3(0.0f, 0.0f, weight.z);
sc.data0 = bssrdf->radius.z;
sd->flag |= bssrdf_setup(&sc, sc.type);
sd->closure[sd->num_closure++] = sc;
}
}
break;
}
case OSL::ClosurePrimitive::Debug:
break; /* not implemented */
case OSL::ClosurePrimitive::Background:
case OSL::ClosurePrimitive::Volume:
break; /* not relevant */
}
}
}
else if (closure->type == OSL::ClosureColor::MUL) {
OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
flatten_surface_closure_tree(sd, path_flag, mul->closure, TO_FLOAT3(mul->weight) * weight);
}
else if (closure->type == OSL::ClosureColor::ADD) {
OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
flatten_surface_closure_tree(sd, path_flag, add->closureA, weight);
flatten_surface_closure_tree(sd, path_flag, add->closureB, weight);
}
}