diff options
Diffstat (limited to 'thirdparty/squish/singlecolourfit.cpp')
| -rw-r--r-- | thirdparty/squish/singlecolourfit.cpp | 259 |
1 files changed, 129 insertions, 130 deletions
diff --git a/thirdparty/squish/singlecolourfit.cpp b/thirdparty/squish/singlecolourfit.cpp index bd02cc41ab..cef0ebc410 100644 --- a/thirdparty/squish/singlecolourfit.cpp +++ b/thirdparty/squish/singlecolourfit.cpp @@ -1,173 +1,172 @@ /* ----------------------------------------------------------------------------- - Copyright (c) 2006 Simon Brown si@sjbrown.co.uk - - Permission is hereby granted, free of charge, to any person obtaining - a copy of this software and associated documentation files (the - "Software"), to deal in the Software without restriction, including - without limitation the rights to use, copy, modify, merge, publish, - distribute, sublicense, and/or sell copies of the Software, and to - permit persons to whom the Software is furnished to do so, subject to - the following conditions: - - The above copyright notice and this permission notice shall be included - in all copies or substantial portions of the Software. - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS - OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. - IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY - CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, - TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE - SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - + Copyright (c) 2006 Simon Brown si@sjbrown.co.uk + + Permission is hereby granted, free of charge, to any person obtaining + a copy of this software and associated documentation files (the + "Software"), to deal in the Software without restriction, including + without limitation the rights to use, copy, modify, merge, publish, + distribute, sublicense, and/or sell copies of the Software, and to + permit persons to whom the Software is furnished to do so, subject to + the following conditions: + + The above copyright notice and this permission notice shall be included + in all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY + CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + -------------------------------------------------------------------------- */ - + #include "singlecolourfit.h" #include "colourset.h" #include "colourblock.h" -#include <climits> namespace squish { struct SourceBlock { - u8 start; - u8 end; - u8 error; + u8 start; + u8 end; + u8 error; }; struct SingleColourLookup { - SourceBlock sources[2]; + SourceBlock sources[2]; }; #include "singlecolourlookup.inl" static int FloatToInt( float a, int limit ) { - // use ANSI round-to-zero behaviour to get round-to-nearest - int i = ( int )( a + 0.5f ); + // use ANSI round-to-zero behaviour to get round-to-nearest + int i = ( int )( a + 0.5f ); - // clamp to the limit - if( i < 0 ) - i = 0; - else if( i > limit ) - i = limit; + // clamp to the limit + if( i < 0 ) + i = 0; + else if( i > limit ) + i = limit; - // done - return i; + // done + return i; } SingleColourFit::SingleColourFit( ColourSet const* colours, int flags ) : ColourFit( colours, flags ) { - // grab the single colour - Vec3 const* values = m_colours->GetPoints(); - m_colour[0] = ( u8 )FloatToInt( 255.0f*values->X(), 255 ); - m_colour[1] = ( u8 )FloatToInt( 255.0f*values->Y(), 255 ); - m_colour[2] = ( u8 )FloatToInt( 255.0f*values->Z(), 255 ); - - // initialise the best error - m_besterror = INT_MAX; + // grab the single colour + Vec3 const* values = m_colours->GetPoints(); + m_colour[0] = ( u8 )FloatToInt( 255.0f*values->X(), 255 ); + m_colour[1] = ( u8 )FloatToInt( 255.0f*values->Y(), 255 ); + m_colour[2] = ( u8 )FloatToInt( 255.0f*values->Z(), 255 ); + + // initialise the best error + m_besterror = INT_MAX; } void SingleColourFit::Compress3( void* block ) { - // build the table of lookups - SingleColourLookup const* const lookups[] = - { - lookup_5_3, - lookup_6_3, - lookup_5_3 - }; - - // find the best end-points and index - ComputeEndPoints( lookups ); - - // build the block if we win - if( m_error < m_besterror ) - { - // remap the indices - u8 indices[16]; - m_colours->RemapIndices( &m_index, indices ); - - // save the block - WriteColourBlock3( m_start, m_end, indices, block ); - - // save the error - m_besterror = m_error; - } + // build the table of lookups + SingleColourLookup const* const lookups[] = + { + lookup_5_3, + lookup_6_3, + lookup_5_3 + }; + + // find the best end-points and index + ComputeEndPoints( lookups ); + + // build the block if we win + if( m_error < m_besterror ) + { + // remap the indices + u8 indices[16]; + m_colours->RemapIndices( &m_index, indices ); + + // save the block + WriteColourBlock3( m_start, m_end, indices, block ); + + // save the error + m_besterror = m_error; + } } void SingleColourFit::Compress4( void* block ) { - // build the table of lookups - SingleColourLookup const* const lookups[] = - { - lookup_5_4, - lookup_6_4, - lookup_5_4 - }; - - // find the best end-points and index - ComputeEndPoints( lookups ); - - // build the block if we win - if( m_error < m_besterror ) - { - // remap the indices - u8 indices[16]; - m_colours->RemapIndices( &m_index, indices ); - - // save the block - WriteColourBlock4( m_start, m_end, indices, block ); - - // save the error - m_besterror = m_error; - } + // build the table of lookups + SingleColourLookup const* const lookups[] = + { + lookup_5_4, + lookup_6_4, + lookup_5_4 + }; + + // find the best end-points and index + ComputeEndPoints( lookups ); + + // build the block if we win + if( m_error < m_besterror ) + { + // remap the indices + u8 indices[16]; + m_colours->RemapIndices( &m_index, indices ); + + // save the block + WriteColourBlock4( m_start, m_end, indices, block ); + + // save the error + m_besterror = m_error; + } } void SingleColourFit::ComputeEndPoints( SingleColourLookup const* const* lookups ) { - // check each index combination (endpoint or intermediate) - m_error = INT_MAX; - for( int index = 0; index < 2; ++index ) - { - // check the error for this codebook index - SourceBlock const* sources[3]; - int error = 0; - for( int channel = 0; channel < 3; ++channel ) - { - // grab the lookup table and index for this channel - SingleColourLookup const* lookup = lookups[channel]; - int target = m_colour[channel]; - - // store a pointer to the source for this channel - sources[channel] = lookup[target].sources + index; - - // accumulate the error - int diff = sources[channel]->error; - error += diff*diff; - } - - // keep it if the error is lower - if( error < m_error ) - { - m_start = Vec3( - ( float )sources[0]->start/31.0f, - ( float )sources[1]->start/63.0f, - ( float )sources[2]->start/31.0f - ); - m_end = Vec3( - ( float )sources[0]->end/31.0f, - ( float )sources[1]->end/63.0f, - ( float )sources[2]->end/31.0f - ); - m_index = ( u8 )( 2*index ); - m_error = error; - } - } + // check each index combination (endpoint or intermediate) + m_error = INT_MAX; + for( int index = 0; index < 2; ++index ) + { + // check the error for this codebook index + SourceBlock const* sources[3]; + int error = 0; + for( int channel = 0; channel < 3; ++channel ) + { + // grab the lookup table and index for this channel + SingleColourLookup const* lookup = lookups[channel]; + int target = m_colour[channel]; + + // store a pointer to the source for this channel + sources[channel] = lookup[target].sources + index; + + // accumulate the error + int diff = sources[channel]->error; + error += diff*diff; + } + + // keep it if the error is lower + if( error < m_error ) + { + m_start = Vec3( + ( float )sources[0]->start/31.0f, + ( float )sources[1]->start/63.0f, + ( float )sources[2]->start/31.0f + ); + m_end = Vec3( + ( float )sources[0]->end/31.0f, + ( float )sources[1]->end/63.0f, + ( float )sources[2]->end/31.0f + ); + m_index = ( u8 )( 2*index ); + m_error = error; + } + } } } // namespace squish |