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529 lines
14 KiB
C++
529 lines
14 KiB
C++
// Game_Music_Emu 0.6.0. http://www.slack.net/~ant/
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#include "Effects_Buffer.h"
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#include <string.h>
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/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "blargg_source.h"
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#ifdef BLARGG_ENABLE_OPTIMIZER
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#include BLARGG_ENABLE_OPTIMIZER
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#endif
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typedef blargg_long fixed_t;
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#define TO_FIXED( f ) fixed_t ((f) * (1L << 15) + 0.5)
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#define FMUL( x, y ) (((x) * (y)) >> 15)
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const unsigned echo_size = 4096;
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const unsigned echo_mask = echo_size - 1;
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BOOST_STATIC_ASSERT( (echo_size & echo_mask) == 0 ); // must be power of 2
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const unsigned reverb_size = 8192 * 2;
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const unsigned reverb_mask = reverb_size - 1;
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BOOST_STATIC_ASSERT( (reverb_size & reverb_mask) == 0 ); // must be power of 2
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Effects_Buffer::config_t::config_t()
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{
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pan_1 = -0.15f;
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pan_2 = 0.15f;
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reverb_delay = 88.0f;
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reverb_level = 0.12f;
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echo_delay = 61.0f;
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echo_level = 0.10f;
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delay_variance = 18.0f;
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effects_enabled = false;
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}
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void Effects_Buffer::set_depth( double d )
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{
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float f = (float) d;
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config_t c;
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c.pan_1 = -0.6f * f;
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c.pan_2 = 0.6f * f;
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c.reverb_delay = 880 * 0.1f;
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c.echo_delay = 610 * 0.1f;
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if ( f > 0.5 )
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f = 0.5; // TODO: more linear reduction of extreme reverb/echo
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c.reverb_level = 0.5f * f;
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c.echo_level = 0.30f * f;
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c.delay_variance = 180 * 0.1f;
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c.effects_enabled = (d > 0.0f);
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config( c );
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}
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Effects_Buffer::Effects_Buffer( bool center_only ) : Multi_Buffer( 2 )
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{
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buf_count = center_only ? max_buf_count - 4 : max_buf_count;
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echo_pos = 0;
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reverb_pos = 0;
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stereo_remain = 0;
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effect_remain = 0;
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effects_enabled = false;
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set_depth( 0 );
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}
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Effects_Buffer::~Effects_Buffer() { }
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blargg_err_t Effects_Buffer::set_sample_rate( long rate, int msec )
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{
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if ( !echo_buf.size() )
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RETURN_ERR( echo_buf.resize( echo_size ) );
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if ( !reverb_buf.size() )
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RETURN_ERR( reverb_buf.resize( reverb_size ) );
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for ( int i = 0; i < buf_count; i++ )
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RETURN_ERR( bufs [i].set_sample_rate( rate, msec ) );
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config( config_ );
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clear();
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return Multi_Buffer::set_sample_rate( bufs [0].sample_rate(), bufs [0].length() );
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}
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void Effects_Buffer::clock_rate( long rate )
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{
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for ( int i = 0; i < buf_count; i++ )
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bufs [i].clock_rate( rate );
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}
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void Effects_Buffer::bass_freq( int freq )
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{
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for ( int i = 0; i < buf_count; i++ )
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bufs [i].bass_freq( freq );
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}
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void Effects_Buffer::clear()
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{
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stereo_remain = 0;
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effect_remain = 0;
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if ( echo_buf.size() )
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memset( &echo_buf [0], 0, echo_size * sizeof echo_buf [0] );
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if ( reverb_buf.size() )
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memset( &reverb_buf [0], 0, reverb_size * sizeof reverb_buf [0] );
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for ( int i = 0; i < buf_count; i++ )
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bufs [i].clear();
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}
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inline int pin_range( int n, int max, int min = 0 )
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{
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if ( n < min )
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return min;
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if ( n > max )
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return max;
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return n;
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}
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void Effects_Buffer::config( const config_t& cfg )
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{
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channels_changed();
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// clear echo and reverb buffers
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if ( !config_.effects_enabled && cfg.effects_enabled && echo_buf.size() )
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{
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memset( &echo_buf [0], 0, echo_size * sizeof echo_buf [0] );
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memset( &reverb_buf [0], 0, reverb_size * sizeof reverb_buf [0] );
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}
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config_ = cfg;
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if ( config_.effects_enabled )
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{
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// convert to internal format
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chans.pan_1_levels [0] = TO_FIXED( 1 ) - TO_FIXED( config_.pan_1 );
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chans.pan_1_levels [1] = TO_FIXED( 2 ) - chans.pan_1_levels [0];
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chans.pan_2_levels [0] = TO_FIXED( 1 ) - TO_FIXED( config_.pan_2 );
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chans.pan_2_levels [1] = TO_FIXED( 2 ) - chans.pan_2_levels [0];
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chans.reverb_level = TO_FIXED( config_.reverb_level );
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chans.echo_level = TO_FIXED( config_.echo_level );
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int delay_offset = int (1.0 / 2000 * config_.delay_variance * sample_rate());
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int reverb_sample_delay = int (1.0 / 1000 * config_.reverb_delay * sample_rate());
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chans.reverb_delay_l = pin_range( reverb_size -
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(reverb_sample_delay - delay_offset) * 2, reverb_size - 2, 0 );
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chans.reverb_delay_r = pin_range( reverb_size + 1 -
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(reverb_sample_delay + delay_offset) * 2, reverb_size - 1, 1 );
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int echo_sample_delay = int (1.0 / 1000 * config_.echo_delay * sample_rate());
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chans.echo_delay_l = pin_range( echo_size - 1 - (echo_sample_delay - delay_offset),
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echo_size - 1 );
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chans.echo_delay_r = pin_range( echo_size - 1 - (echo_sample_delay + delay_offset),
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echo_size - 1 );
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chan_types [0].center = &bufs [0];
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chan_types [0].left = &bufs [3];
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chan_types [0].right = &bufs [4];
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chan_types [1].center = &bufs [1];
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chan_types [1].left = &bufs [3];
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chan_types [1].right = &bufs [4];
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chan_types [2].center = &bufs [2];
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chan_types [2].left = &bufs [5];
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chan_types [2].right = &bufs [6];
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assert( 2 < chan_types_count );
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}
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else
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{
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// set up outputs
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for ( unsigned i = 0; i < chan_types_count; i++ )
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{
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channel_t& c = chan_types [i];
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c.center = &bufs [0];
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c.left = &bufs [1];
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c.right = &bufs [2];
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}
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}
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if ( buf_count < max_buf_count )
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{
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for ( int i = 0; i < chan_types_count; i++ )
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{
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channel_t& c = chan_types [i];
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c.left = c.center;
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c.right = c.center;
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}
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}
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}
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Effects_Buffer::channel_t Effects_Buffer::channel( int i, int type )
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{
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int out = 2;
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if ( !type )
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{
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out = i % 5;
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if ( out > 2 )
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out = 2;
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}
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else if ( !(type & noise_type) && (type & type_index_mask) % 3 != 0 )
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{
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out = type & 1;
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}
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return chan_types [out];
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}
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void Effects_Buffer::end_frame( blip_time_t clock_count )
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{
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int bufs_used = 0;
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for ( int i = 0; i < buf_count; i++ )
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{
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bufs_used |= bufs [i].clear_modified() << i;
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bufs [i].end_frame( clock_count );
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}
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int stereo_mask = (config_.effects_enabled ? 0x78 : 0x06);
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if ( (bufs_used & stereo_mask) && buf_count == max_buf_count )
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stereo_remain = bufs [0].samples_avail() + bufs [0].output_latency();
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if ( effects_enabled || config_.effects_enabled )
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effect_remain = bufs [0].samples_avail() + bufs [0].output_latency();
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effects_enabled = config_.effects_enabled;
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}
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long Effects_Buffer::samples_avail() const
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{
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return bufs [0].samples_avail() * 2;
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}
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long Effects_Buffer::read_samples( blip_sample_t* out, long total_samples )
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{
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require( total_samples % 2 == 0 ); // count must be even
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long remain = bufs [0].samples_avail();
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if ( remain > (total_samples >> 1) )
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remain = (total_samples >> 1);
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total_samples = remain;
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while ( remain )
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{
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int active_bufs = buf_count;
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long count = remain;
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// optimizing mixing to skip any channels which had nothing added
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if ( effect_remain )
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{
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if ( count > effect_remain )
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count = effect_remain;
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if ( stereo_remain )
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{
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mix_enhanced( out, count );
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}
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else
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{
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mix_mono_enhanced( out, count );
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active_bufs = 3;
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}
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}
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else if ( stereo_remain )
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{
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mix_stereo( out, count );
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active_bufs = 3;
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}
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else
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{
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mix_mono( out, count );
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active_bufs = 1;
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}
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out += count * 2;
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remain -= count;
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stereo_remain -= count;
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if ( stereo_remain < 0 )
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stereo_remain = 0;
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effect_remain -= count;
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if ( effect_remain < 0 )
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effect_remain = 0;
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for ( int i = 0; i < buf_count; i++ )
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{
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if ( i < active_bufs )
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bufs [i].remove_samples( count );
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else
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bufs [i].remove_silence( count ); // keep time synchronized
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}
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}
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return total_samples * 2;
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}
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void Effects_Buffer::mix_mono( blip_sample_t* out_, blargg_long count )
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{
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blip_sample_t* BLIP_RESTRICT out = out_;
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int const bass = BLIP_READER_BASS( bufs [0] );
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BLIP_READER_BEGIN( c, bufs [0] );
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// unrolled loop
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for ( blargg_long n = count >> 1; n; --n )
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{
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blargg_long cs0 = BLIP_READER_READ( c );
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BLIP_READER_NEXT( c, bass );
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blargg_long cs1 = BLIP_READER_READ( c );
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BLIP_READER_NEXT( c, bass );
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if ( (BOOST::int16_t) cs0 != cs0 )
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cs0 = 0x7FFF - (cs0 >> 24);
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((BOOST::uint32_t*) out) [0] = ((BOOST::uint16_t) cs0) | (cs0 << 16);
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if ( (BOOST::int16_t) cs1 != cs1 )
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cs1 = 0x7FFF - (cs1 >> 24);
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((BOOST::uint32_t*) out) [1] = ((BOOST::uint16_t) cs1) | (cs1 << 16);
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out += 4;
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}
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if ( count & 1 )
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{
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int s = BLIP_READER_READ( c );
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BLIP_READER_NEXT( c, bass );
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out [0] = s;
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out [1] = s;
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if ( (BOOST::int16_t) s != s )
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{
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s = 0x7FFF - (s >> 24);
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out [0] = s;
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out [1] = s;
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}
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}
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BLIP_READER_END( c, bufs [0] );
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}
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void Effects_Buffer::mix_stereo( blip_sample_t* out_, blargg_long count )
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{
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blip_sample_t* BLIP_RESTRICT out = out_;
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int const bass = BLIP_READER_BASS( bufs [0] );
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BLIP_READER_BEGIN( c, bufs [0] );
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BLIP_READER_BEGIN( l, bufs [1] );
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BLIP_READER_BEGIN( r, bufs [2] );
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while ( count-- )
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{
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int cs = BLIP_READER_READ( c );
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BLIP_READER_NEXT( c, bass );
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int left = cs + BLIP_READER_READ( l );
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int right = cs + BLIP_READER_READ( r );
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BLIP_READER_NEXT( l, bass );
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BLIP_READER_NEXT( r, bass );
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if ( (BOOST::int16_t) left != left )
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left = 0x7FFF - (left >> 24);
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out [0] = left;
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out [1] = right;
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out += 2;
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if ( (BOOST::int16_t) right != right )
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out [-1] = 0x7FFF - (right >> 24);
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}
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BLIP_READER_END( r, bufs [2] );
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BLIP_READER_END( l, bufs [1] );
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BLIP_READER_END( c, bufs [0] );
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}
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void Effects_Buffer::mix_mono_enhanced( blip_sample_t* out_, blargg_long count )
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{
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blip_sample_t* BLIP_RESTRICT out = out_;
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int const bass = BLIP_READER_BASS( bufs [2] );
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BLIP_READER_BEGIN( center, bufs [2] );
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BLIP_READER_BEGIN( sq1, bufs [0] );
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BLIP_READER_BEGIN( sq2, bufs [1] );
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blip_sample_t* const reverb_buf = this->reverb_buf.begin();
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blip_sample_t* const echo_buf = this->echo_buf.begin();
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int echo_pos = this->echo_pos;
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int reverb_pos = this->reverb_pos;
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while ( count-- )
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{
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int sum1_s = BLIP_READER_READ( sq1 );
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int sum2_s = BLIP_READER_READ( sq2 );
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BLIP_READER_NEXT( sq1, bass );
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BLIP_READER_NEXT( sq2, bass );
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int new_reverb_l = FMUL( sum1_s, chans.pan_1_levels [0] ) +
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FMUL( sum2_s, chans.pan_2_levels [0] ) +
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reverb_buf [(reverb_pos + chans.reverb_delay_l) & reverb_mask];
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int new_reverb_r = FMUL( sum1_s, chans.pan_1_levels [1] ) +
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FMUL( sum2_s, chans.pan_2_levels [1] ) +
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reverb_buf [(reverb_pos + chans.reverb_delay_r) & reverb_mask];
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fixed_t reverb_level = chans.reverb_level;
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reverb_buf [reverb_pos] = (blip_sample_t) FMUL( new_reverb_l, reverb_level );
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reverb_buf [reverb_pos + 1] = (blip_sample_t) FMUL( new_reverb_r, reverb_level );
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reverb_pos = (reverb_pos + 2) & reverb_mask;
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int sum3_s = BLIP_READER_READ( center );
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BLIP_READER_NEXT( center, bass );
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int left = new_reverb_l + sum3_s + FMUL( chans.echo_level,
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echo_buf [(echo_pos + chans.echo_delay_l) & echo_mask] );
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int right = new_reverb_r + sum3_s + FMUL( chans.echo_level,
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echo_buf [(echo_pos + chans.echo_delay_r) & echo_mask] );
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echo_buf [echo_pos] = sum3_s;
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echo_pos = (echo_pos + 1) & echo_mask;
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if ( (BOOST::int16_t) left != left )
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left = 0x7FFF - (left >> 24);
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out [0] = left;
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out [1] = right;
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out += 2;
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if ( (BOOST::int16_t) right != right )
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out [-1] = 0x7FFF - (right >> 24);
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}
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this->reverb_pos = reverb_pos;
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this->echo_pos = echo_pos;
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BLIP_READER_END( sq1, bufs [0] );
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BLIP_READER_END( sq2, bufs [1] );
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BLIP_READER_END( center, bufs [2] );
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}
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void Effects_Buffer::mix_enhanced( blip_sample_t* out_, blargg_long count )
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{
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blip_sample_t* BLIP_RESTRICT out = out_;
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int const bass = BLIP_READER_BASS( bufs [2] );
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BLIP_READER_BEGIN( center, bufs [2] );
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BLIP_READER_BEGIN( l1, bufs [3] );
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BLIP_READER_BEGIN( r1, bufs [4] );
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BLIP_READER_BEGIN( l2, bufs [5] );
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BLIP_READER_BEGIN( r2, bufs [6] );
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BLIP_READER_BEGIN( sq1, bufs [0] );
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BLIP_READER_BEGIN( sq2, bufs [1] );
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blip_sample_t* const reverb_buf = this->reverb_buf.begin();
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blip_sample_t* const echo_buf = this->echo_buf.begin();
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int echo_pos = this->echo_pos;
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int reverb_pos = this->reverb_pos;
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while ( count-- )
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{
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int sum1_s = BLIP_READER_READ( sq1 );
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int sum2_s = BLIP_READER_READ( sq2 );
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BLIP_READER_NEXT( sq1, bass );
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BLIP_READER_NEXT( sq2, bass );
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int new_reverb_l = FMUL( sum1_s, chans.pan_1_levels [0] ) +
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FMUL( sum2_s, chans.pan_2_levels [0] ) + BLIP_READER_READ( l1 ) +
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reverb_buf [(reverb_pos + chans.reverb_delay_l) & reverb_mask];
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|
|
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int new_reverb_r = FMUL( sum1_s, chans.pan_1_levels [1] ) +
|
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FMUL( sum2_s, chans.pan_2_levels [1] ) + BLIP_READER_READ( r1 ) +
|
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reverb_buf [(reverb_pos + chans.reverb_delay_r) & reverb_mask];
|
|
|
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BLIP_READER_NEXT( l1, bass );
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BLIP_READER_NEXT( r1, bass );
|
|
|
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fixed_t reverb_level = chans.reverb_level;
|
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reverb_buf [reverb_pos] = (blip_sample_t) FMUL( new_reverb_l, reverb_level );
|
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reverb_buf [reverb_pos + 1] = (blip_sample_t) FMUL( new_reverb_r, reverb_level );
|
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reverb_pos = (reverb_pos + 2) & reverb_mask;
|
|
|
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int sum3_s = BLIP_READER_READ( center );
|
|
BLIP_READER_NEXT( center, bass );
|
|
|
|
int left = new_reverb_l + sum3_s + BLIP_READER_READ( l2 ) + FMUL( chans.echo_level,
|
|
echo_buf [(echo_pos + chans.echo_delay_l) & echo_mask] );
|
|
int right = new_reverb_r + sum3_s + BLIP_READER_READ( r2 ) + FMUL( chans.echo_level,
|
|
echo_buf [(echo_pos + chans.echo_delay_r) & echo_mask] );
|
|
|
|
BLIP_READER_NEXT( l2, bass );
|
|
BLIP_READER_NEXT( r2, bass );
|
|
|
|
echo_buf [echo_pos] = sum3_s;
|
|
echo_pos = (echo_pos + 1) & echo_mask;
|
|
|
|
if ( (BOOST::int16_t) left != left )
|
|
left = 0x7FFF - (left >> 24);
|
|
|
|
out [0] = left;
|
|
out [1] = right;
|
|
|
|
out += 2;
|
|
|
|
if ( (BOOST::int16_t) right != right )
|
|
out [-1] = 0x7FFF - (right >> 24);
|
|
}
|
|
this->reverb_pos = reverb_pos;
|
|
this->echo_pos = echo_pos;
|
|
|
|
BLIP_READER_END( l1, bufs [3] );
|
|
BLIP_READER_END( r1, bufs [4] );
|
|
BLIP_READER_END( l2, bufs [5] );
|
|
BLIP_READER_END( r2, bufs [6] );
|
|
BLIP_READER_END( sq1, bufs [0] );
|
|
BLIP_READER_END( sq2, bufs [1] );
|
|
BLIP_READER_END( center, bufs [2] );
|
|
}
|
|
|