mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-09 12:25:16 +01:00
144 lines
4.8 KiB
C
144 lines
4.8 KiB
C
/* md_ntsc 0.1.2. 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 "md_ntsc.h"
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/* Copyright (C) 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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md_ntsc_setup_t const md_ntsc_monochrome = { 0,-1, 0, 0,.2, 0, 0,-.2,-.2,-1, 0, 0 };
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md_ntsc_setup_t const md_ntsc_composite = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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md_ntsc_setup_t const md_ntsc_svideo = { 0, 0, 0, 0, 0, 0,.2, -1, -1, 0, 0, 0 };
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md_ntsc_setup_t const md_ntsc_rgb = { 0, 0, 0, 0,.2, 0,.7, -1, -1,-1, 0, 0 };
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#define alignment_count 2
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#define burst_count 1
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#define rescale_in 1
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#define rescale_out 1
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#define artifacts_mid 0.40f
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#define fringing_mid 0.30f
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#define std_decoder_hue 0
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#define gamma_size 8
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#define artifacts_max 1.00f
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#define LUMA_CUTOFF 0.1974
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#include "md_ntsc_impl.h"
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/* 2 input pixels -> 4 composite samples */
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pixel_info_t const md_ntsc_pixels [alignment_count] = {
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{ PIXEL_OFFSET( -4, -9 ), { 0.1f, 0.9f, 0.9f, 0.1f } },
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{ PIXEL_OFFSET( -2, -7 ), { 0.1f, 0.9f, 0.9f, 0.1f } },
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};
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static void correct_errors( md_ntsc_rgb_t color, md_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 / 4; i++ )
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{
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md_ntsc_rgb_t error = color -
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out [i ] - out [i + 2 +16] - out [i + 4 ] - out [i + 6 +16] -
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out [i + 8] - out [(i+10)%16+16] - out [(i+12)%16] - out [(i+14)%16+16];
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CORRECT_ERROR( i + 6 + 16 );
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/*DISTRIBUTE_ERROR( 2+16, 4, 6+16 );*/
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}
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}
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void md_ntsc_init( md_ntsc_t* ntsc, md_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 = &md_ntsc_composite;
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init( &impl, setup );
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for ( entry = 0; entry < md_ntsc_palette_size; entry++ )
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{
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float bb = impl.to_float [entry >> 6 & 7];
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float gg = impl.to_float [entry >> 3 & 7];
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float rr = impl.to_float [entry & 7];
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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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md_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 md_ntsc_blit( md_ntsc_t const* ntsc, MD_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 / md_ntsc_in_chunk - 1;
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/* use palette entry 0 for unused pixels */
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MD_NTSC_IN_T border = table[0];
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MD_NTSC_BEGIN_ROW( ntsc, border,
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MD_NTSC_ADJ_IN( table[*input++] ),
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MD_NTSC_ADJ_IN( table[*input++] ),
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MD_NTSC_ADJ_IN( table[*input++] ) );
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md_ntsc_out_t* restrict line_out = (md_ntsc_out_t*)(&bitmap.data[(vline * bitmap.pitch)]);
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int n;
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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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MD_NTSC_COLOR_IN( 0, ntsc, MD_NTSC_ADJ_IN( table[*input++] ) );
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MD_NTSC_RGB_OUT( 0, *line_out++ );
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MD_NTSC_RGB_OUT( 1, *line_out++ );
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MD_NTSC_COLOR_IN( 1, ntsc, MD_NTSC_ADJ_IN( table[*input++] ) );
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MD_NTSC_RGB_OUT( 2, *line_out++ );
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MD_NTSC_RGB_OUT( 3, *line_out++ );
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MD_NTSC_COLOR_IN( 2, ntsc, MD_NTSC_ADJ_IN( table[*input++] ) );
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MD_NTSC_RGB_OUT( 4, *line_out++ );
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MD_NTSC_RGB_OUT( 5, *line_out++ );
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MD_NTSC_COLOR_IN( 3, ntsc, MD_NTSC_ADJ_IN( table[*input++] ) );
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MD_NTSC_RGB_OUT( 6, *line_out++ );
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MD_NTSC_RGB_OUT( 7, *line_out++ );
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}
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/* finish final pixels */
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MD_NTSC_COLOR_IN( 0, ntsc, MD_NTSC_ADJ_IN( table[*input++] ) );
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MD_NTSC_RGB_OUT( 0, *line_out++ );
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MD_NTSC_RGB_OUT( 1, *line_out++ );
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MD_NTSC_COLOR_IN( 1, ntsc, border );
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MD_NTSC_RGB_OUT( 2, *line_out++ );
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MD_NTSC_RGB_OUT( 3, *line_out++ );
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MD_NTSC_COLOR_IN( 2, ntsc, border );
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MD_NTSC_RGB_OUT( 4, *line_out++ );
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MD_NTSC_RGB_OUT( 5, *line_out++ );
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MD_NTSC_COLOR_IN( 3, ntsc, border );
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MD_NTSC_RGB_OUT( 6, *line_out++ );
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MD_NTSC_RGB_OUT( 7, *line_out++ );
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}
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#endif
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