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// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "rtcore.h"
namespace embree {
namespace instance_id_stack {
static_assert(RTC_MAX_INSTANCE_LEVEL_COUNT > 0,
"RTC_MAX_INSTANCE_LEVEL_COUNT must be greater than 0.");
/*******************************************************************************
* Instance ID stack manipulation.
* This is used from the instance intersector.
******************************************************************************/
/*
* Push an instance to the stack.
*/
RTC_FORCEINLINE bool push(RTCIntersectContext* context,
unsigned instanceId)
{
#if RTC_MAX_INSTANCE_LEVEL_COUNT > 1
const bool spaceAvailable = context->instStackSize < RTC_MAX_INSTANCE_LEVEL_COUNT;
/* We assert here because instances are silently dropped when the stack is full.
This might be quite hard to find in production. */
assert(spaceAvailable);
if (likely(spaceAvailable))
context->instID[context->instStackSize++] = instanceId;
return spaceAvailable;
#else
const bool spaceAvailable = (context->instID[0] == RTC_INVALID_GEOMETRY_ID);
assert(spaceAvailable);
if (likely(spaceAvailable))
context->instID[0] = instanceId;
return spaceAvailable;
#endif
}
/*
* Pop the last instance pushed to the stack.
* Do not call on an empty stack.
*/
RTC_FORCEINLINE void pop(RTCIntersectContext* context)
{
assert(context);
#if RTC_MAX_INSTANCE_LEVEL_COUNT > 1
assert(context->instStackSize > 0);
context->instID[--context->instStackSize] = RTC_INVALID_GEOMETRY_ID;
#else
assert(context->instID[0] != RTC_INVALID_GEOMETRY_ID);
context->instID[0] = RTC_INVALID_GEOMETRY_ID;
#endif
}
/*******************************************************************************
* Optimized instance id stack copy.
* The copy() function at the bottom of this block will either copy full
* stacks or copy only until the last valid element has been copied, depending
* on RTC_MAX_INSTANCE_LEVEL_COUNT.
******************************************************************************/
/*
* Plain array assignment. This works for scalar->scalar,
* scalar->vector, and vector->vector.
*/
template <class Src, class Tgt>
RTC_FORCEINLINE void level_copy(unsigned level, Src* src, Tgt* tgt)
{
tgt[level] = src[level];
}
/*
* Masked SIMD vector->vector store.
*/
template <int K>
RTC_FORCEINLINE void level_copy(unsigned level, const vuint<K>* src, vuint<K>* tgt, const vbool<K>& mask)
{
vuint<K>::storeu(mask, tgt + level, src[level]);
}
/*
* Masked scalar->SIMD vector store.
*/
template <int K>
RTC_FORCEINLINE void level_copy(unsigned level, const unsigned* src, vuint<K>* tgt, const vbool<K>& mask)
{
vuint<K>::store(mask, tgt + level, src[level]);
}
/*
* Indexed assign from vector to scalar.
*/
template <int K>
RTC_FORCEINLINE void level_copy(unsigned level, const vuint<K>* src, unsigned* tgt, const size_t& idx)
{
tgt[level] = src[level][idx];
}
/*
* Indexed assign from scalar to vector.
*/
template <int K>
RTC_FORCEINLINE void level_copy(unsigned level, const unsigned* src, vuint<K>* tgt, const size_t& idx)
{
tgt[level][idx] = src[level];
}
/*
* Indexed assign from vector to vector.
*/
template <int K>
RTC_FORCEINLINE void level_copy(unsigned level, const vuint<K>* src, vuint<K>* tgt, const size_t& i, const size_t& j)
{
tgt[level][j] = src[level][i];
}
/*
* Check if the given stack level is valid.
* These are only used for large max stack sizes.
*/
RTC_FORCEINLINE bool level_valid(unsigned level, const unsigned* stack)
{
return stack[level] != RTC_INVALID_GEOMETRY_ID;
}
RTC_FORCEINLINE bool level_valid(unsigned level, const unsigned* stack, const size_t& /*i*/)
{
return stack[level] != RTC_INVALID_GEOMETRY_ID;
}
template <int K>
RTC_FORCEINLINE bool level_valid(unsigned level, const unsigned* stack, const vbool<K>& /*mask*/)
{
return stack[level] != RTC_INVALID_GEOMETRY_ID;
}
template <int K>
RTC_FORCEINLINE bool level_valid(unsigned level, const vuint<K>* stack)
{
return any(stack[level] != RTC_INVALID_GEOMETRY_ID);
}
template <int K>
RTC_FORCEINLINE bool level_valid(unsigned level, const vuint<K>* stack, const vbool<K>& mask)
{
return any(mask & (stack[level] != RTC_INVALID_GEOMETRY_ID));
}
template <int K>
RTC_FORCEINLINE bool level_valid(unsigned level, const vuint<K>* stack, const size_t& i)
{
return stack[level][i] != RTC_INVALID_GEOMETRY_ID;
}
template <int K>
RTC_FORCEINLINE bool level_valid(unsigned level, const vuint<K>* stack, const size_t& i, const size_t& /*j*/)
{
return stack[level][i] != RTC_INVALID_GEOMETRY_ID;
}
/*
* Copy an instance ID stack.
*
* This function automatically selects a LevelFunctor from the above Assign
* structs.
*/
template <class Src, class Tgt, class... Args>
RTC_FORCEINLINE void copy(Src src, Tgt tgt, Args&&... args)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
/*
* Avoid all loops for only one level.
*/
level_copy(0, src, tgt, std::forward<Args>(args)...);
#elif (RTC_MAX_INSTANCE_LEVEL_COUNT <= 4)
/*
* It is faster to avoid the valid test for low level counts.
* Just copy the whole stack.
*/
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l)
level_copy(l, src, tgt, std::forward<Args>(args)...);
#else
/*
* For general stack sizes, it pays off to test for validity.
*/
bool valid = true;
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT && valid; ++l)
{
level_copy(l, src, tgt, std::forward<Args>(args)...);
valid = level_valid(l, src, std::forward<Args>(args)...);
}
#endif
}
} // namespace instance_id_stack
} // namespace embree
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