mirror of
https://github.com/kmc-jp/n64-emu.git
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70 lines
No EOL
2.6 KiB
C
70 lines
No EOL
2.6 KiB
C
/* Copyright (c) 2020 Themaister
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef DITHER_H_
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#define DITHER_H_
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const u8 dither_matrices[2][16] = u8[][](
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u8[](U8_C(0), U8_C(6), U8_C(1), U8_C(7), U8_C(4), U8_C(2), U8_C(5), U8_C(3), U8_C(3), U8_C(5), U8_C(2), U8_C(4), U8_C(7), U8_C(1), U8_C(6), U8_C(0)),
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u8[](U8_C(0), U8_C(4), U8_C(1), U8_C(5), U8_C(4), U8_C(0), U8_C(5), U8_C(1), U8_C(3), U8_C(7), U8_C(2), U8_C(6), U8_C(7), U8_C(3), U8_C(6), U8_C(2)));
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u8x3 rgb_dither(ivec3 orig_rgb, int dith)
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{
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ivec3 rgb_dith = (ivec3(dith) >> ivec3(0, 3, 6)) & 7;
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ivec3 rgb = mix((orig_rgb & 0xf8) + 8, ivec3(255), greaterThan(orig_rgb, ivec3(247)));
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ivec3 replace_sign = (rgb_dith - (orig_rgb & 7)) >> 31;
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ivec3 dither_diff = rgb - orig_rgb;
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rgb = orig_rgb + (dither_diff & replace_sign);
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return u8x3(rgb & 0xff);
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}
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void dither_coefficients(int x, int y, int dither_mode_rgb, int dither_mode_alpha, out int rgb_dither, out int alpha_dither)
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{
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const int DITHER_SPLAT = (1 << 0) | (1 << 3) | (1 << 6);
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if (dither_mode_rgb < 2)
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rgb_dither = int(dither_matrices[dither_mode_rgb][(y & 3) * 4 + (x & 3)]) * DITHER_SPLAT;
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else if (dither_mode_rgb == 2)
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rgb_dither = noise_get_dither_color();
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else
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rgb_dither = 0;
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if (dither_mode_alpha == 3)
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alpha_dither = 0;
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else
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{
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if (dither_mode_alpha == 2)
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{
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alpha_dither = noise_get_dither_alpha();
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}
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else
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{
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alpha_dither = dither_mode_rgb >= 2 ?
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int(dither_matrices[dither_mode_rgb & 1][(y & 3) * 4 + (x & 3)]) : (rgb_dither & 7);
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if (dither_mode_alpha == 1)
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alpha_dither = ~alpha_dither & 7;
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}
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}
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}
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#endif |