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// Copyright 2009-2021 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.
*/
template<typename Context>
RTC_FORCEINLINE bool push(Context context,
unsigned instanceId,
unsigned instancePrimId)
{
#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;
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
context->instPrimID[context->instStackSize] = instancePrimId;
#endif
context->instStackSize++;
}
return spaceAvailable;
#else
const bool spaceAvailable = (context->instID[0] == RTC_INVALID_GEOMETRY_ID);
assert(spaceAvailable);
if (likely(spaceAvailable)) {
context->instID[0] = instanceId;
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
context->instPrimID[0] = instancePrimId;
#endif
}
return spaceAvailable;
#endif
}
/*
* Pop the last instance pushed to the stack.
* Do not call on an empty stack.
*/
template<typename Context>
RTC_FORCEINLINE void pop(Context context)
{
assert(context);
#if RTC_MAX_INSTANCE_LEVEL_COUNT > 1
assert(context->instStackSize > 0);
--context->instStackSize;
context->instID[context->instStackSize] = RTC_INVALID_GEOMETRY_ID;
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
context->instPrimID[context->instStackSize] = RTC_INVALID_GEOMETRY_ID;
#endif
#else
assert(context->instID[0] != RTC_INVALID_GEOMETRY_ID);
context->instID[0] = RTC_INVALID_GEOMETRY_ID;
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
context->instPrimID[0] = RTC_INVALID_GEOMETRY_ID;
#endif
#endif
}
/* Push an instance to the stack. Used for point queries*/
RTC_FORCEINLINE bool push(RTCPointQueryContext* context,
unsigned int instanceId,
unsigned int instancePrimId,
AffineSpace3fa const& w2i,
AffineSpace3fa const& i2w)
{
assert(context);
const size_t stackSize = context->instStackSize;
assert(stackSize < RTC_MAX_INSTANCE_LEVEL_COUNT);
context->instID[stackSize] = instanceId;
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
context->instPrimID[stackSize] = instancePrimId;
#endif
AffineSpace3fa_store_unaligned(w2i,(AffineSpace3fa*)context->world2inst[stackSize]);
AffineSpace3fa_store_unaligned(i2w,(AffineSpace3fa*)context->inst2world[stackSize]);
#if RTC_MAX_INSTANCE_LEVEL_COUNT > 1
if (unlikely(stackSize > 0))
{
const AffineSpace3fa world2inst = AffineSpace3fa_load_unaligned((AffineSpace3fa*)context->world2inst[stackSize ])
* AffineSpace3fa_load_unaligned((AffineSpace3fa*)context->world2inst[stackSize-1]);
const AffineSpace3fa inst2world = AffineSpace3fa_load_unaligned((AffineSpace3fa*)context->inst2world[stackSize-1])
* AffineSpace3fa_load_unaligned((AffineSpace3fa*)context->inst2world[stackSize ]);
AffineSpace3fa_store_unaligned(world2inst,(AffineSpace3fa*)context->world2inst[stackSize]);
AffineSpace3fa_store_unaligned(inst2world,(AffineSpace3fa*)context->inst2world[stackSize]);
}
#endif
context->instStackSize++;
return true;
}
template<>
RTC_FORCEINLINE void pop(RTCPointQueryContext* context)
{
assert(context);
#if RTC_MAX_INSTANCE_LEVEL_COUNT > 1
assert(context->instStackSize > 0);
#else
assert(context->instID[0] != RTC_INVALID_GEOMETRY_ID);
#endif
--context->instStackSize;
context->instID[context->instStackSize] = RTC_INVALID_GEOMETRY_ID;
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
context->instPrimID[context->instStackSize] = RTC_INVALID_GEOMETRY_ID;
#endif
}
/*
* Optimized instance id stack copy.
* The copy() functions will either copy full
* stacks or copy only until the last valid element has been copied, depending
* on RTC_MAX_INSTANCE_LEVEL_COUNT.
*/
RTC_FORCEINLINE void copy_UU(const unsigned* src, unsigned* tgt)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
tgt[0] = src[0];
#else
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
tgt[l] = src[l];
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4)
if (src[l] == RTC_INVALID_GEOMETRY_ID)
break;
}
#endif
}
RTC_FORCEINLINE void copy_UU(const RTCRayQueryContext* context, const unsigned* src, unsigned* tgt)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
tgt[0] = src[0];
#else
unsigned int depth = context->instStackSize;
for (unsigned l = 0; l < depth; ++l)
tgt[l] = src[l];
for (unsigned l = depth; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l)
tgt[l] = RTC_INVALID_GEOMETRY_ID;
#endif
}
template <int K>
RTC_FORCEINLINE void copy_UV(const unsigned* src, vuint<K>* tgt)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
tgt[0] = src[0];
#else
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
tgt[l] = src[l];
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4)
if (src[l] == RTC_INVALID_GEOMETRY_ID)
break;
}
#endif
}
template <int K>
RTC_FORCEINLINE void copy_UV(const unsigned* src, vuint<K>* tgt, size_t j)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
tgt[0][j] = src[0];
#else
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
tgt[l][j] = src[l];
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4)
if (src[l] == RTC_INVALID_GEOMETRY_ID)
break;
}
#endif
}
template <int K>
RTC_FORCEINLINE void copy_UV(const unsigned* src, vuint<K>* tgt, const vbool<K>& mask)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
vuint<K>::store(mask, tgt, src[0]);
#else
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
vuint<K>::store(mask, tgt + l, src[l]);
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4)
if (src[l] == RTC_INVALID_GEOMETRY_ID)
break;
}
#endif
}
template <int K>
RTC_FORCEINLINE void copy_VU(const vuint<K>* src, unsigned* tgt, size_t i)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
tgt[0] = src[0][i];
#else
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
tgt[l] = src[l][i];
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4)
if (src[l][i] == RTC_INVALID_GEOMETRY_ID)
break;
}
#endif
}
template <int K>
RTC_FORCEINLINE void copy_VV(const vuint<K>* src, vuint<K>* tgt, size_t i, size_t j)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
tgt[0][j] = src[0][i];
#else
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
tgt[l][j] = src[l][i];
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4)
if (src[l][i] == RTC_INVALID_GEOMETRY_ID)
break;
}
#endif
}
template <int K>
RTC_FORCEINLINE void copy_VV(const vuint<K>* src, vuint<K>* tgt, const vbool<K>& mask)
{
#if (RTC_MAX_INSTANCE_LEVEL_COUNT == 1)
vuint<K>::store(mask, tgt, src[0]);
#else
vbool<K> done = !mask;
for (unsigned l = 0; l < RTC_MAX_INSTANCE_LEVEL_COUNT; ++l) {
vuint<K>::store(mask, tgt + l, src[l]);
if (RTC_MAX_INSTANCE_LEVEL_COUNT > 4) {
done |= src[l] == RTC_INVALID_GEOMETRY_ID;
if (all(done)) break;
}
}
#endif
}
} // namespace instance_id_stack
} // namespace embree
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