480 lines
16 KiB
C++
480 lines
16 KiB
C++
/*
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Copyright (c) 2014, Conor Stokes
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "indexbufferdecompression.h"
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#include "readbitstream.h"
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#include "indexcompressionconstants.h"
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#include "indexbuffercompressionformat.h"
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#include <assert.h>
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template <typename Ty>
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void DecompressTriangleCodes1( Ty* triangles, uint32_t triangleCount, ReadBitstream& input )
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{
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Edge edgeFifo[ EDGE_FIFO_SIZE ];
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uint32_t vertexFifo[ VERTEX_FIFO_SIZE ];
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uint32_t edgesRead = 0;
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uint32_t verticesRead = 0;
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uint32_t newVertices = 0;
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const Ty* triangleEnd = triangles + ( triangleCount * 3 );
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// iterate through the triangles
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for ( Ty* triangle = triangles; triangle < triangleEnd; triangle += 3 )
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{
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IndexBufferTriangleCodes code = static_cast< IndexBufferTriangleCodes >( input.Read( IB_TRIANGLE_CODE_BITS ) );
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switch ( code )
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{
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case IB_EDGE_NEW:
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{
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uint32_t edgeFifoIndex = input.Read( CACHED_EDGE_BITS );
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const Edge& edge = edgeFifo[ ( ( edgesRead - 1 ) - edgeFifoIndex ) & EDGE_FIFO_MASK ];
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triangle[ 0 ] = static_cast< Ty >( edge.second );
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triangle[ 1 ] = static_cast< Ty >( edge.first );
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vertexFifo[ verticesRead & EDGE_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( newVertices );
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++newVertices;
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++verticesRead;
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break;
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}
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case IB_EDGE_CACHED:
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{
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uint32_t edgeFifoIndex = input.Read( CACHED_EDGE_BITS );
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uint32_t vertexFifoIndex = input.Read( CACHED_VERTEX_BITS );
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const Edge& edge = edgeFifo[ ( ( edgesRead - 1 ) - edgeFifoIndex ) & EDGE_FIFO_MASK ];
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triangle[ 0 ] = static_cast< Ty >( edge.second );
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triangle[ 1 ] = static_cast< Ty >( edge.first );
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triangle[ 2 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertexFifoIndex ) & VERTEX_FIFO_MASK ] );
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break;
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}
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case IB_EDGE_FREE:
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{
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uint32_t edgeFifoIndex = input.Read( CACHED_EDGE_BITS );
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uint32_t relativeVertex = input.ReadVInt();
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const Edge& edge = edgeFifo[ ( ( edgesRead - 1 ) - edgeFifoIndex ) & EDGE_FIFO_MASK ];
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triangle[ 0 ] = static_cast< Ty >( edge.second );
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triangle[ 1 ] = static_cast< Ty >( edge.first );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex );
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++verticesRead;
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break;
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}
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case IB_NEW_NEW_NEW:
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{
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( newVertices + 1 );
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vertexFifo[ ( verticesRead + 2 ) & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( newVertices + 2 );
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newVertices += 3;
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verticesRead += 3;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_NEW_NEW_CACHED:
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{
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uint32_t vertexFifoIndex = input.Read( CACHED_VERTEX_BITS );
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triangle[ 2 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertexFifoIndex ) & VERTEX_FIFO_MASK ] );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( newVertices + 1 );
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verticesRead += 2;
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newVertices += 2;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_NEW_NEW_FREE:
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{
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uint32_t relativeVertex = input.ReadVInt();
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( newVertices + 1 );
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vertexFifo[ ( verticesRead + 2 ) & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex );
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newVertices += 2;
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verticesRead += 3;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_NEW_CACHED_CACHED:
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{
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uint32_t vertex1FifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t vertex2FifoIndex = input.Read( CACHED_VERTEX_BITS );
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triangle[ 1 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex1FifoIndex ) & VERTEX_FIFO_MASK ] );
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triangle[ 2 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex2FifoIndex ) & VERTEX_FIFO_MASK ] );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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++verticesRead;
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++newVertices;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_NEW_CACHED_FREE:
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{
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uint32_t vertexFifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t relativeVertex = input.ReadVInt();
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triangle[ 1 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertexFifoIndex ) & VERTEX_FIFO_MASK ] );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex );
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verticesRead += 2;
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++newVertices;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_NEW_FREE_CACHED:
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{
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uint32_t relativeVertex = input.ReadVInt();
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uint32_t vertexFifoIndex = input.Read( CACHED_VERTEX_BITS );
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triangle[ 2 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertexFifoIndex ) & VERTEX_FIFO_MASK ] );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex );
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verticesRead += 2;
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++newVertices;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_NEW_FREE_FREE:
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{
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uint32_t relativeVertex1 = input.ReadVInt();
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uint32_t relativeVertex2 = input.ReadVInt();
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( newVertices );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex1 );
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vertexFifo[ ( verticesRead + 2 ) & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex2 );
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verticesRead += 3;
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++newVertices;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_CACHED_CACHED_CACHED:
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{
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uint32_t vertex0FifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t vertex1FifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t vertex2FifoIndex = input.Read( CACHED_VERTEX_BITS );
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triangle[ 0 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex0FifoIndex ) & VERTEX_FIFO_MASK ] );
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triangle[ 1 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex1FifoIndex ) & VERTEX_FIFO_MASK ] );
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triangle[ 2 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex2FifoIndex ) & VERTEX_FIFO_MASK ] );
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_CACHED_CACHED_FREE:
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{
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uint32_t vertex0FifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t vertex1FifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t relativeVertex2 = input.ReadVInt();
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triangle[ 0 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex0FifoIndex ) & VERTEX_FIFO_MASK ] );
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triangle[ 1 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex1FifoIndex ) & VERTEX_FIFO_MASK ] );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex2 );
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++verticesRead;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_CACHED_FREE_FREE:
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{
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uint32_t vertex0FifoIndex = input.Read( CACHED_VERTEX_BITS );
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uint32_t relativeVertex1 = input.ReadVInt();
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uint32_t relativeVertex2 = input.ReadVInt();
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triangle[ 0 ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - vertex0FifoIndex ) & VERTEX_FIFO_MASK ] );
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex1 );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex2 );
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verticesRead += 2;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_FREE_FREE_FREE:
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{
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uint32_t relativeVertex0 = input.ReadVInt();
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uint32_t relativeVertex1 = input.ReadVInt();
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uint32_t relativeVertex2 = input.ReadVInt();
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ 0 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex0 );
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vertexFifo[ ( verticesRead + 1 ) & VERTEX_FIFO_MASK ] =
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triangle[ 1 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex1 );
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vertexFifo[ ( verticesRead + 2 ) & VERTEX_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( ( newVertices - 1 ) - relativeVertex2 );
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verticesRead += 3;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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break;
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}
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case IB_EDGE_0_NEW:
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{
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const Edge& edge = edgeFifo[ ( edgesRead - 1 ) & EDGE_FIFO_MASK ];
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triangle[ 0 ] = static_cast< Ty >( edge.second );
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triangle[ 1 ] = static_cast< Ty >( edge.first );
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vertexFifo[ verticesRead & EDGE_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( newVertices );
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++newVertices;
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++verticesRead;
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break;
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}
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case IB_EDGE_1_NEW:
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{
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const Edge& edge = edgeFifo[ ( ( edgesRead - 1 ) - 1 ) & EDGE_FIFO_MASK ];
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triangle[ 0 ] = static_cast< Ty >( edge.second );
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triangle[ 1 ] = static_cast< Ty >( edge.first );
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vertexFifo[ verticesRead & EDGE_FIFO_MASK ] =
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triangle[ 2 ] = static_cast< Ty >( newVertices );
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++newVertices;
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++verticesRead;
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break;
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}
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}
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 1 ], triangle[ 2 ] );
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++edgesRead;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 2 ], triangle[ 0 ] );
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++edgesRead;
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}
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}
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template <typename Ty>
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void DecompressIndiceCodes1( Ty* triangles, uint32_t triangleCount, ReadBitstream& input )
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{
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Edge edgeFifo[ EDGE_FIFO_SIZE ];
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uint32_t vertexFifo[ VERTEX_FIFO_SIZE ];
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uint32_t edgesRead = 0;
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uint32_t verticesRead = 0;
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uint32_t newVertices = 0;
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const Ty* triangleEnd = triangles + ( triangleCount * 3 );
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// iterate through the triangles
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for ( Ty* triangle = triangles; triangle < triangleEnd; triangle += 3 )
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{
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int readVertex = 0;
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bool skipFirstEdge = false;
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while ( readVertex < 3 )
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{
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IndexBufferCodes code = static_cast< IndexBufferCodes >( input.Read( IB_VERTEX_CODE_BITS ) );
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switch ( code )
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{
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case IB_NEW_VERTEX:
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ readVertex ] = static_cast< Ty >( newVertices );
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++readVertex;
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++verticesRead;
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++newVertices;
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break;
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case IB_CACHED_EDGE:
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{
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assert( readVertex == 0 );
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uint32_t fifoIndex = input.Read( CACHED_EDGE_BITS );
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const Edge& edge = edgeFifo[ ( ( edgesRead - 1 ) - fifoIndex ) & EDGE_FIFO_MASK ];
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triangle[ 0 ] = static_cast< Ty >( edge.second );
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triangle[ 1 ] = static_cast< Ty >( edge.first );
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readVertex += 2;
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skipFirstEdge = true;
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break;
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}
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case IB_CACHED_VERTEX:
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{
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uint32_t fifoIndex = input.Read( CACHED_VERTEX_BITS );
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triangle[ readVertex ] = static_cast< Ty >( vertexFifo[ ( ( verticesRead - 1 ) - fifoIndex ) & VERTEX_FIFO_MASK ] );
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++readVertex;
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break;
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}
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case IB_FREE_VERTEX:
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{
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uint32_t relativeVertex = input.ReadVInt();
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uint32_t vertex = ( newVertices - 1 ) - relativeVertex;
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vertexFifo[ verticesRead & VERTEX_FIFO_MASK ] =
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triangle[ readVertex ] = static_cast< Ty >( vertex );
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++verticesRead;
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++readVertex;
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break;
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}
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}
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}
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if ( !skipFirstEdge )
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{
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 0 ], triangle[ 1 ] );
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++edgesRead;
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}
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else // first 2 verts were an edge case, so insert them into the vertex fifo.
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{
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vertexFifo[ verticesRead & EDGE_FIFO_MASK ] = triangle[ 0 ];
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++verticesRead;
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vertexFifo[ verticesRead & EDGE_FIFO_MASK ] = triangle[ 1 ];
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++verticesRead;
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}
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 1 ], triangle[ 2 ] );
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++edgesRead;
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edgeFifo[ edgesRead & EDGE_FIFO_MASK ].set( triangle[ 2 ], triangle[ 0 ] );
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++edgesRead;
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}
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}
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template < typename Ty >
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void DecompressIndexBuffer( Ty* triangles, uint32_t triangleCount, ReadBitstream& input )
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{
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IndexBufferCompressionFormat format = static_cast< IndexBufferCompressionFormat >( input.ReadVInt() );
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switch ( format )
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{
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case IBCF_PER_INDICE_1:
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DecompressIndiceCodes1<Ty>( triangles, triangleCount, input );
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break;
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case IBCF_PER_TRIANGLE_1:
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DecompressTriangleCodes1<Ty>( triangles, triangleCount, input );
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break;
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}
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}
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void DecompressIndexBuffer( uint32_t* triangles, uint32_t triangleCount, ReadBitstream& input )
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{
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DecompressIndexBuffer<uint32_t>( triangles, triangleCount, input );
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}
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void DecompressIndexBuffer( uint16_t* triangles, uint32_t triangleCount, ReadBitstream& input )
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{
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DecompressIndexBuffer<uint16_t>( triangles, triangleCount, input );
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}
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