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/*========================== begin_copyright_notice ============================
Copyright (C) 2019-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "RTStackFormat.h"
#include "iStdLib/utility.h"
#include <array>
#include "Probe/Assertion.h"
namespace RTStackFormat {
// Compute the size of the hardware portion of the RTStack.
uint32_t getRTStackHeaderSize(uint32_t MaxBVHLevels)
{
// TODO: The compiler currently hardcodes its offsets to assume 2 BVH
// levels. When we move to read the BVH levels from the
// RayDispatchGlobalData we can remove this check.
IGC_ASSERT_MESSAGE((MaxBVHLevels > 0), "Unsupported level!");
static constexpr std::array<uint32_t, 9> Sizes =
{
0,
sizeof(RTStack<1>),
sizeof(RTStack<2>),
sizeof(RTStack<3>),
sizeof(RTStack<4>),
sizeof(RTStack<5>),
sizeof(RTStack<6>),
sizeof(RTStack<7>),
sizeof(RTStack<8>),
};
// stack size per ray is in encoded in 64 byte chunks. Align up so the UMD
// can evenly divide it.
// In addition, we currently align up to 128 bytes so that different RTStacks
// won't cross an LSC sector.
static_assert(IGC::RTStackAlign % IGC::RayDispatchGlobalData::StackChunkSize == 0, "no?");
return IGC::Align(Sizes[MaxBVHLevels], IGC::RTStackAlign);
}
} // namespace RTStackFormat
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