mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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142 lines
4.9 KiB
C
142 lines
4.9 KiB
C
/* sms_ntsc 0.2.3. http://www.slack.net/~ant/ */
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/* Modified for use with Genesis Plus GX -- EkeEke */
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#include "shared.h"
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#include "sms_ntsc.h"
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/* Copyright (C) 2006-2007 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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sms_ntsc_setup_t const sms_ntsc_monochrome = { 0,-1, 0, 0,.2, 0, .2,-.2,-.2,-1, 0, 0 };
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sms_ntsc_setup_t const sms_ntsc_composite = { 0, 0, 0, 0, 0, 0,.25, 0, 0, 0, 0, 0 };
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sms_ntsc_setup_t const sms_ntsc_svideo = { 0, 0, 0, 0, 0, 0,.25, -1, -1, 0, 0, 0 };
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sms_ntsc_setup_t const sms_ntsc_rgb = { 0, 0, 0, 0,.2, 0,.70, -1, -1,-1, 0, 0 };
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#define alignment_count 3
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#define burst_count 1
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#define rescale_in 8
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#define rescale_out 7
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#define artifacts_mid 0.4f
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#define artifacts_max 1.2f
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#define fringing_mid 0.8f
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#define std_decoder_hue 0
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#define gamma_size 16
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#include "sms_ntsc_impl.h"
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/* 3 input pixels -> 8 composite samples */
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pixel_info_t const sms_ntsc_pixels [alignment_count] = {
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{ PIXEL_OFFSET( -4, -9 ), { 1, 1, .6667f, 0 } },
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{ PIXEL_OFFSET( -2, -7 ), { .3333f, 1, 1, .3333f } },
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{ PIXEL_OFFSET( 0, -5 ), { 0, .6667f, 1, 1 } },
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};
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static void correct_errors( sms_ntsc_rgb_t color, sms_ntsc_rgb_t* out )
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{
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unsigned i;
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for ( i = 0; i < rgb_kernel_size / 2; i++ )
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{
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sms_ntsc_rgb_t error = color -
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out [i ] - out [(i+12)%14+14] - out [(i+10)%14+28] -
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out [i + 7] - out [i + 5 +14] - out [i + 3 +28];
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CORRECT_ERROR( i + 3 + 28 );
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}
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}
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void sms_ntsc_init( sms_ntsc_t* ntsc, sms_ntsc_setup_t const* setup )
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{
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int entry;
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init_t impl;
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if ( !setup )
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setup = &sms_ntsc_composite;
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init( &impl, setup );
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for ( entry = 0; entry < sms_ntsc_palette_size; entry++ )
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{
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float bb = impl.to_float [entry >> 8 & 0x0F];
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float gg = impl.to_float [entry >> 4 & 0x0F];
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float rr = impl.to_float [entry & 0x0F];
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float y, i, q = RGB_TO_YIQ( rr, gg, bb, y, i );
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int r, g, b = YIQ_TO_RGB( y, i, q, impl.to_rgb, int, r, g );
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sms_ntsc_rgb_t rgb = PACK_RGB( r, g, b );
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if ( setup->palette_out )
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RGB_PALETTE_OUT( rgb, &setup->palette_out [entry * 3] );
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if ( ntsc )
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{
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gen_kernel( &impl, y, i, q, ntsc->table [entry] );
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correct_errors( rgb, ntsc->table [entry] );
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}
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}
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}
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#ifndef CUSTOM_BLITTER
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void sms_ntsc_blit( sms_ntsc_t const* ntsc, SMS_NTSC_IN_T const* table, unsigned char* input,
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int in_width, int vline)
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{
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int const chunk_count = in_width / sms_ntsc_in_chunk;
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/* handle extra 0, 1, or 2 pixels by placing them at beginning of row */
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int const in_extra = in_width - chunk_count * sms_ntsc_in_chunk;
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unsigned const extra2 = (unsigned) -(in_extra >> 1 & 1); /* (unsigned) -1 = ~0 */
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unsigned const extra1 = (unsigned) -(in_extra & 1) | extra2;
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/* use palette entry 0 for unused pixels */
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SMS_NTSC_IN_T border = table[0];
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SMS_NTSC_BEGIN_ROW( ntsc, border,
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(SMS_NTSC_ADJ_IN( table[input[0]] )) & extra2,
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(SMS_NTSC_ADJ_IN( table[input[extra2 & 1]] )) & extra1 );
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sms_ntsc_out_t* restrict line_out = (sms_ntsc_out_t*)(&bitmap.data[(vline * bitmap.pitch)]);
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int n;
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input += in_extra;
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for ( n = chunk_count; n; --n )
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{
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/* order of input and output pixels must not be altered */
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SMS_NTSC_COLOR_IN( 0, ntsc, SMS_NTSC_ADJ_IN( table[*input++] ) );
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SMS_NTSC_RGB_OUT( 0, *line_out++ );
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SMS_NTSC_RGB_OUT( 1, *line_out++ );
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SMS_NTSC_COLOR_IN( 1, ntsc, SMS_NTSC_ADJ_IN( table[*input++] ) );
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SMS_NTSC_RGB_OUT( 2, *line_out++ );
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SMS_NTSC_RGB_OUT( 3, *line_out++ );
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SMS_NTSC_COLOR_IN( 2, ntsc, SMS_NTSC_ADJ_IN( table[*input++] ) );
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SMS_NTSC_RGB_OUT( 4, *line_out++ );
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SMS_NTSC_RGB_OUT( 5, *line_out++ );
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SMS_NTSC_RGB_OUT( 6, *line_out++ );
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}
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/* finish final pixels */
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SMS_NTSC_COLOR_IN( 0, ntsc, border );
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SMS_NTSC_RGB_OUT( 0, *line_out++ );
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SMS_NTSC_RGB_OUT( 1, *line_out++ );
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SMS_NTSC_COLOR_IN( 1, ntsc, border );
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SMS_NTSC_RGB_OUT( 2, *line_out++ );
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SMS_NTSC_RGB_OUT( 3, *line_out++ );
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SMS_NTSC_COLOR_IN( 2, ntsc, border );
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SMS_NTSC_RGB_OUT( 4, *line_out++ );
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SMS_NTSC_RGB_OUT( 5, *line_out++ );
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SMS_NTSC_RGB_OUT( 6, *line_out++ );
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}
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#endif
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