void RendererServices::clear_derivatives(
const OIIO::TypeDesc& type,
void* val)
{
if (type != OIIO::TypeDesc::TypeString)
memset(reinterpret_cast<char*>(val) + type.size(), 0, 2 * type.size());
}
void RendererServices::clear_attr_derivatives(
bool derivs,
const OIIO::TypeDesc& type,
void* val)
{
if (derivs)
{
if (type == OIIO::TypeDesc::TypeString)
{
reinterpret_cast<OIIO::ustring*>(val)[1] = g_empty_ustr;
reinterpret_cast<OIIO::ustring*>(val)[2] = g_empty_ustr;
}
else
memset(reinterpret_cast<char*>(val) + type.size(), 0, 2 * type.size());
}
}
bool RendererServices::getmessage(
OSL::ShaderGlobals* sg,
OIIO::ustring source,
OIIO::ustring name,
OIIO::TypeDesc type,
void* val,
bool derivatives)
{
const ShadingPoint::OSLTraceData* trace_data =
reinterpret_cast<ShadingPoint::OSLTraceData*>(sg->tracedata);
if (trace_data->m_traced)
{
if (source == g_trace_ustr)
{
if (name == g_hit_ustr && type == OIIO::TypeDesc::TypeInt)
reinterpret_cast<int*>(val)[0] = trace_data->m_hit ? 1 : 0;
else if (name == g_hitdist_ustr && type == OIIO::TypeDesc::TypeFloat)
reinterpret_cast<float*>(val)[0] = trace_data->m_hit_distance;
else if (name == g_N_ustr && type == OIIO::TypeDesc::TypeNormal)
*reinterpret_cast<OSL::Vec3*>(val) = trace_data->m_N;
else if (name == g_Ng_ustr && type == OIIO::TypeDesc::TypeNormal)
*reinterpret_cast<OSL::Vec3*>(val) = trace_data->m_Ng;
else if (name == g_P_ustr && type == OIIO::TypeDesc::TypePoint)
*reinterpret_cast<OSL::Vec3*>(val) = trace_data->m_P;
else if (name == g_u_ustr && type == OIIO::TypeDesc::TypeFloat)
reinterpret_cast<float*>(val)[0] = trace_data->m_u;
else if (name == g_v_ustr && type == OIIO::TypeDesc::TypeFloat)
reinterpret_cast<float*>(val)[0] = trace_data->m_v;
else
return false;
// For now, set derivatives to zero.
if (derivatives)
memset(reinterpret_cast<char*>(val) + type.size(), 0, 2 * type.size());
return true;
}
}
return false;
}