252 lines
8.5 KiB
C
252 lines
8.5 KiB
C
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/* snes_ntsc 0.2.2. http://www.slack.net/~ant/ */
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#include "snes_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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snes_ntsc_setup_t const snes_ntsc_monochrome = { 0,-1, 0, 0,.2, 0,.2,-.2,-.2,-1, 1, 0, 0 };
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snes_ntsc_setup_t const snes_ntsc_composite = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 };
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snes_ntsc_setup_t const snes_ntsc_svideo = { 0, 0, 0, 0,.2, 0,.2, -1, -1, 0, 1, 0, 0 };
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snes_ntsc_setup_t const snes_ntsc_rgb = { 0, 0, 0, 0,.2, 0,.7, -1, -1,-1, 1, 0, 0 };
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#define alignment_count 3
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#define burst_count 3
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#define rescale_in 8
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#define rescale_out 7
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#define artifacts_mid 1.0f
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#define fringing_mid 1.0f
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#define std_decoder_hue 0
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#define rgb_bits 7 /* half normal range to allow for doubled hires pixels */
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#define gamma_size 32
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#include "snes_ntsc_impl.h"
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/* 3 input pixels -> 8 composite samples */
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pixel_info_t const snes_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 merge_kernel_fields( snes_ntsc_rgb_t* io )
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{
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int n;
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for ( n = burst_size; n; --n )
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{
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snes_ntsc_rgb_t p0 = io [burst_size * 0] + rgb_bias;
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snes_ntsc_rgb_t p1 = io [burst_size * 1] + rgb_bias;
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snes_ntsc_rgb_t p2 = io [burst_size * 2] + rgb_bias;
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/* merge colors without losing precision */
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io [burst_size * 0] =
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((p0 + p1 - ((p0 ^ p1) & snes_ntsc_rgb_builder)) >> 1) - rgb_bias;
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io [burst_size * 1] =
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((p1 + p2 - ((p1 ^ p2) & snes_ntsc_rgb_builder)) >> 1) - rgb_bias;
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io [burst_size * 2] =
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((p2 + p0 - ((p2 ^ p0) & snes_ntsc_rgb_builder)) >> 1) - rgb_bias;
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++io;
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}
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}
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static void correct_errors( snes_ntsc_rgb_t color, snes_ntsc_rgb_t* out )
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{
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int n;
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for ( n = burst_count; n; --n )
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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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snes_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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DISTRIBUTE_ERROR( i+3+28, i+5+14, i+7 );
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}
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out += alignment_count * rgb_kernel_size;
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}
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}
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void snes_ntsc_init( snes_ntsc_t* ntsc, snes_ntsc_setup_t const* setup )
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{
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int merge_fields;
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int entry;
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init_t impl;
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if ( !setup )
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setup = &snes_ntsc_composite;
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init( &impl, setup );
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merge_fields = setup->merge_fields;
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if ( setup->artifacts <= -1 && setup->fringing <= -1 )
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merge_fields = 1;
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for ( entry = 0; entry < snes_ntsc_palette_size; entry++ )
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{
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/* Reduce number of significant bits of source color. Clearing the
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low bits of R and B were least notictable. Modifying green was too
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noticeable. */
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int ir = entry >> 8 & 0x1E;
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int ig = entry >> 4 & 0x1F;
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int ib = entry << 1 & 0x1E;
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#if SNES_NTSC_BSNES_COLORTBL
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if ( setup->bsnes_colortbl )
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{
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int bgr15 = (ib << 10) | (ig << 5) | ir;
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unsigned long rgb16 = setup->bsnes_colortbl [bgr15];
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ir = rgb16 >> 11 & 0x1E;
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ig = rgb16 >> 6 & 0x1F;
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ib = rgb16 & 0x1E;
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}
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#endif
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{
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float rr = impl.to_float [ir];
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float gg = impl.to_float [ig];
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float bb = impl.to_float [ib];
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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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snes_ntsc_rgb_t rgb = PACK_RGB( r, g, b );
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snes_ntsc_rgb_t* out = ntsc->table [entry];
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gen_kernel( &impl, y, i, q, out );
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if ( merge_fields )
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merge_kernel_fields( out );
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correct_errors( rgb, out );
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}
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}
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}
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#ifndef SNES_NTSC_NO_BLITTERS
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void snes_ntsc_blit( snes_ntsc_t const* ntsc, SNES_NTSC_IN_T const* input, long in_row_width,
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int burst_phase, int in_width, int in_height, void* rgb_out, long out_pitch )
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{
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int chunk_count = (in_width - 1) / snes_ntsc_in_chunk;
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for ( ; in_height; --in_height )
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{
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SNES_NTSC_IN_T const* line_in = input;
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SNES_NTSC_BEGIN_ROW( ntsc, burst_phase,
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snes_ntsc_black, snes_ntsc_black, SNES_NTSC_ADJ_IN( *line_in ) );
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snes_ntsc_out_t* restrict line_out = (snes_ntsc_out_t*) rgb_out;
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int n;
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++line_in;
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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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SNES_NTSC_COLOR_IN( 0, SNES_NTSC_ADJ_IN( line_in [0] ) );
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SNES_NTSC_RGB_OUT( 0, line_out [0], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 1, line_out [1], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 1, SNES_NTSC_ADJ_IN( line_in [1] ) );
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SNES_NTSC_RGB_OUT( 2, line_out [2], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 3, line_out [3], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 2, SNES_NTSC_ADJ_IN( line_in [2] ) );
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SNES_NTSC_RGB_OUT( 4, line_out [4], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 5, line_out [5], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 6, line_out [6], SNES_NTSC_OUT_DEPTH );
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line_in += 3;
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line_out += 7;
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}
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/* finish final pixels */
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SNES_NTSC_COLOR_IN( 0, snes_ntsc_black );
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SNES_NTSC_RGB_OUT( 0, line_out [0], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 1, line_out [1], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 1, snes_ntsc_black );
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SNES_NTSC_RGB_OUT( 2, line_out [2], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 3, line_out [3], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 2, snes_ntsc_black );
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SNES_NTSC_RGB_OUT( 4, line_out [4], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 5, line_out [5], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_RGB_OUT( 6, line_out [6], SNES_NTSC_OUT_DEPTH );
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burst_phase = (burst_phase + 1) % snes_ntsc_burst_count;
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input += in_row_width;
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rgb_out = (char*) rgb_out + out_pitch;
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}
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}
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void snes_ntsc_blit_hires( snes_ntsc_t const* ntsc, SNES_NTSC_IN_T const* input, long in_row_width,
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int burst_phase, int in_width, int in_height, void* rgb_out, long out_pitch )
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{
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int chunk_count = (in_width - 2) / (snes_ntsc_in_chunk * 2);
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for ( ; in_height; --in_height )
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{
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SNES_NTSC_IN_T const* line_in = input;
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SNES_NTSC_HIRES_ROW( ntsc, burst_phase,
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snes_ntsc_black, snes_ntsc_black, snes_ntsc_black,
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SNES_NTSC_ADJ_IN( line_in [0] ),
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SNES_NTSC_ADJ_IN( line_in [1] ) );
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snes_ntsc_out_t* restrict line_out = (snes_ntsc_out_t*) rgb_out;
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int n;
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line_in += 2;
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for ( n = chunk_count; n; --n )
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{
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/* twice as many input pixels per chunk */
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SNES_NTSC_COLOR_IN( 0, SNES_NTSC_ADJ_IN( line_in [0] ) );
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SNES_NTSC_HIRES_OUT( 0, line_out [0], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 1, SNES_NTSC_ADJ_IN( line_in [1] ) );
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SNES_NTSC_HIRES_OUT( 1, line_out [1], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 2, SNES_NTSC_ADJ_IN( line_in [2] ) );
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SNES_NTSC_HIRES_OUT( 2, line_out [2], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 3, SNES_NTSC_ADJ_IN( line_in [3] ) );
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SNES_NTSC_HIRES_OUT( 3, line_out [3], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 4, SNES_NTSC_ADJ_IN( line_in [4] ) );
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SNES_NTSC_HIRES_OUT( 4, line_out [4], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 5, SNES_NTSC_ADJ_IN( line_in [5] ) );
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SNES_NTSC_HIRES_OUT( 5, line_out [5], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_HIRES_OUT( 6, line_out [6], SNES_NTSC_OUT_DEPTH );
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line_in += 6;
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line_out += 7;
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}
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SNES_NTSC_COLOR_IN( 0, snes_ntsc_black );
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SNES_NTSC_HIRES_OUT( 0, line_out [0], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 1, snes_ntsc_black );
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SNES_NTSC_HIRES_OUT( 1, line_out [1], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 2, snes_ntsc_black );
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SNES_NTSC_HIRES_OUT( 2, line_out [2], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 3, snes_ntsc_black );
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SNES_NTSC_HIRES_OUT( 3, line_out [3], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 4, snes_ntsc_black );
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SNES_NTSC_HIRES_OUT( 4, line_out [4], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_COLOR_IN( 5, snes_ntsc_black );
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SNES_NTSC_HIRES_OUT( 5, line_out [5], SNES_NTSC_OUT_DEPTH );
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SNES_NTSC_HIRES_OUT( 6, line_out [6], SNES_NTSC_OUT_DEPTH );
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burst_phase = (burst_phase + 1) % snes_ntsc_burst_count;
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input += in_row_width;
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rgb_out = (char*) rgb_out + out_pitch;
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}
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}
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#endif
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