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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*
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* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
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* its licensors.
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*
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* For complete copyright and license terms please see the LICENSE at the root of this
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* distribution (the "License"). All use of this software is governed by the License,
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* or, if provided, by the license below or the license accompanying this file. Do not
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* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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