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68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#include <Atom/RPI.Public/Model/UvStreamTangentBitmask.h>
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#include <AzCore/Debug/Trace.h>
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namespace AZ
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{
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namespace RPI
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{
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uint32_t UvStreamTangentBitmask::GetFullTangentBitmask() const
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{
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return m_mask;
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}
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uint32_t UvStreamTangentBitmask::GetUvStreamCount() const
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{
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return m_mask >> (sizeof(m_mask) * CHAR_BIT - BitsForUvIndex);
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}
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uint32_t UvStreamTangentBitmask::GetTangentAtUv(uint32_t uvIndex) const
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{
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return (m_mask >> (BitsPerTangent * uvIndex)) & 0b1111u;
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}
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void UvStreamTangentBitmask::ApplyTangent(uint32_t tangentIndex)
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{
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uint32_t currentSlot = GetUvStreamCount();
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if (currentSlot >= MaxUvSlots)
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{
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AZ_Error("UV Stream", false, "Reaching the max of avaiblable stream slots.");
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return;
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}
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if (tangentIndex > UnassignedTangent)
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{
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AZ_Warning(
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"UV Stream", false,
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"Tangent index must use %d bits as defined in UvStreamTangentIndex::m_flag. Unassigned index will be applied.",
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BitsPerTangent);
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tangentIndex = UnassignedTangent;
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}
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uint32_t clearMask = 0b1111u << (BitsPerTangent * currentSlot);
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clearMask = ~clearMask;
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// Clear the writing bits in case
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m_mask &= clearMask;
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// Write the bits to the slot
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m_mask |= (tangentIndex << (BitsPerTangent * currentSlot));
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// Increase the index
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m_mask += (1u << (sizeof(m_mask) * CHAR_BIT - BitsForUvIndex));
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}
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void UvStreamTangentBitmask::Reset()
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{
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m_mask = 0;
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}
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}
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}
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