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https://github.com/kmc-jp/n64-emu.git
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81 lines
No EOL
2.5 KiB
C
81 lines
No EOL
2.5 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 COVERAGE_H_
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#define COVERAGE_H_
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#include "data_structures.h"
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const int SUBPIXELS_LOG2 = 2;
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const int SUBPIXELS = 1 << SUBPIXELS_LOG2;
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u8 compute_coverage(u16x4 xleft, u16x4 xright, int x)
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{
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u16x4 xshift = u16x4(0, 4, 2, 6) + (u16(x) << U16_C(3));
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bvec4 clip_lo_x01 = lessThan(xshift, xleft.xxyy);
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bvec4 clip_lo_x23 = lessThan(xshift, xleft.zzww);
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bvec4 clip_hi_x01 = greaterThanEqual(xshift, xright.xxyy);
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bvec4 clip_hi_x23 = greaterThanEqual(xshift, xright.zzww);
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u8x4 clip_x0 = u8x4(clip_lo_x01) | u8x4(clip_hi_x01);
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u8x4 clip_x1 = u8x4(clip_lo_x23) | u8x4(clip_hi_x23);
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u8x4 clip_x = clip_x0 * u8x4(1, 2, 4, 8) + clip_x1 * u8x4(16, 32, 64, 128);
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u8 clip_coverage = (clip_x.x | clip_x.y) | (clip_x.z | clip_x.w);
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return ~clip_coverage & U8_C(0xff);
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}
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const int COVERAGE_CLAMP = 0;
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const int COVERAGE_WRAP = 1;
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const int COVERAGE_ZAP = 2;
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const int COVERAGE_SAVE = 3;
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int blend_coverage(int coverage, int memory_coverage, bool blend_en, int mode)
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{
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int res = 0;
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switch (mode)
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{
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case COVERAGE_CLAMP:
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{
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if (blend_en)
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res = min(7, memory_coverage + coverage); // image_read_en to read memory coverage, otherwise, it's 7.
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else
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res = (coverage - 1) & 7;
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break;
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}
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case COVERAGE_WRAP:
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res = (coverage + memory_coverage) & 7;
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break;
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case COVERAGE_ZAP:
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res = 7;
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break;
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case COVERAGE_SAVE:
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res = memory_coverage;
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break;
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}
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return res;
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}
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#endif |