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xash3d-fwgs/ref/vk/shaders/peters2021-sampling/polygon_clipping.glsl

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// Copyright (C) 2021, Christoph Peters, Karlsruhe Institute of Technology
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
/*! Returns the intersection of the line connecting the given two points with
the plane z == 0.0f.*/
vec3 iz0(vec3 lhs, vec3 rhs) {
float lerp_factor = lhs.z / (lhs.z - rhs.z);
// Equivalent to the following but I have trust issues regarding the
// stability of mix()
// return vec3(mix(lhs.xy, rhs.xy, lerp_factor), 0.0f);
return vec3(fma(vec2(lerp_factor), rhs.xy, fma(-vec2(lerp_factor), lhs.xy, lhs.xy)), 0.0f);
}
/*! This function clips the given convex polygon with vertices in v to the
upper hemisphere (i.e. the half-space with non-negative z-coordinate).
The vertex count after clipping is returned. It is either zero or between
three and vertex_count + 1. If it is less than MAX_POLYGON_VERTEX_COUNT,
the first entry of v is repeated at the returned vertex count for the
output. vertex_count must be at least
MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING.*/
uint clip_polygon(uint vertex_count, inout vec3 v[MAX_POLYGON_VERTEX_COUNT]) {
// The vertex count after clipping
uint vc;
// Encode the whole configuration into a single integer
uint bit_mask = vertex_count;
[[unroll]]
for (uint i = 0; i != MAX_POLYGON_VERTEX_COUNT - 1; ++i)
bit_mask |= (v[i].z > 0.0f && (i < MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING || i < vertex_count)) ? (1 << (i + 3)) : 0;
// This code has been generated automatically to handle all possible cases
// with a single conditional jump and no unnecessary instructions
switch (bit_mask) {
// AUTOGENERATED PART BEGIN
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 3 && MAX_POLYGON_VERTEX_COUNT >= 4
case 3: vc = 0; break;
case 59: vc = 3; v[3] = v[0]; break;
case 11: vc = 3; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[2], v[0]); v[3] = v[0]; break;
case 19: vc = 3; v[0] = iz0(v[0], v[1]); v[2] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 35: vc = 3; v[0] = iz0(v[2], v[0]); v[1] = iz0(v[1], v[2]); v[3] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 3 && MAX_POLYGON_VERTEX_COUNT == 4
case 27: vc = 4; v[3] = iz0(v[2], v[0]); v[2] = iz0(v[1], v[2]); break;
case 51: vc = 4; v[3] = iz0(v[2], v[0]); v[0] = iz0(v[0], v[1]); break;
case 43: vc = 4; v[3] = v[2]; v[2] = iz0(v[1], v[2]); v[1] = iz0(v[0], v[1]); break;
#elif MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 3 && MAX_POLYGON_VERTEX_COUNT > 4
case 27: vc = 4; v[3] = iz0(v[2], v[0]); v[2] = iz0(v[1], v[2]); v[4] = v[0]; break;
case 51: vc = 4; v[3] = iz0(v[2], v[0]); v[0] = iz0(v[0], v[1]); v[4] = v[0]; break;
case 43: vc = 4; v[3] = v[2]; v[2] = iz0(v[1], v[2]); v[1] = iz0(v[0], v[1]); v[4] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 4 && MAX_POLYGON_VERTEX_COUNT >= 5
case 4: vc = 0; break;
case 124: vc = 4; v[4] = v[0]; break;
case 12: vc = 3; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[3], v[0]); v[3] = v[0]; break;
case 20: vc = 3; v[0] = iz0(v[0], v[1]); v[2] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 36: vc = 3; v[0] = iz0(v[2], v[3]); v[1] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 68: vc = 3; v[1] = iz0(v[3], v[0]); v[0] = v[3]; v[2] = iz0(v[2], v[3]); break;
case 28: vc = 4; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[3], v[0]); v[4] = v[0]; break;
case 52: vc = 4; v[0] = iz0(v[0], v[1]); v[3] = iz0(v[2], v[3]); v[4] = v[0]; break;
case 100: vc = 4; v[0] = iz0(v[3], v[0]); v[1] = iz0(v[1], v[2]); v[4] = v[0]; break;
case 76: vc = 4; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[2], v[3]); v[4] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 4 && MAX_POLYGON_VERTEX_COUNT == 5
case 60: vc = 5; v[4] = iz0(v[3], v[0]); v[3] = iz0(v[2], v[3]); break;
case 116: vc = 5; v[4] = iz0(v[3], v[0]); v[0] = iz0(v[0], v[1]); break;
case 108: vc = 5; v[4] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); break;
case 92: vc = 5; v[4] = v[3]; v[3] = iz0(v[2], v[3]); v[2] = iz0(v[1], v[2]); break;
#elif MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 4 && MAX_POLYGON_VERTEX_COUNT > 5
case 60: vc = 5; v[4] = iz0(v[3], v[0]); v[3] = iz0(v[2], v[3]); v[5] = v[0]; break;
case 116: vc = 5; v[4] = iz0(v[3], v[0]); v[0] = iz0(v[0], v[1]); v[5] = v[0]; break;
case 108: vc = 5; v[4] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); v[5] = v[0]; break;
case 92: vc = 5; v[4] = v[3]; v[3] = iz0(v[2], v[3]); v[2] = iz0(v[1], v[2]); v[5] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 5 && MAX_POLYGON_VERTEX_COUNT >= 6
case 5: vc = 0; break;
case 253: vc = 5; v[5] = v[0]; break;
case 13: vc = 3; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[4], v[0]); v[3] = v[0]; break;
case 21: vc = 3; v[0] = iz0(v[0], v[1]); v[2] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 37: vc = 3; v[0] = iz0(v[2], v[3]); v[1] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 69: vc = 3; v[0] = v[3]; v[1] = iz0(v[3], v[4]); v[2] = iz0(v[2], v[3]); break;
case 133: vc = 3; v[1] = v[4]; v[2] = iz0(v[4], v[0]); v[0] = iz0(v[3], v[4]); v[3] = v[0]; break;
case 29: vc = 4; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[4], v[0]); v[4] = v[0]; break;
case 53: vc = 4; v[0] = iz0(v[0], v[1]); v[3] = iz0(v[2], v[3]); v[4] = v[0]; break;
case 101: vc = 4; v[0] = iz0(v[3], v[4]); v[1] = iz0(v[1], v[2]); v[4] = v[0]; break;
case 197: vc = 4; v[1] = iz0(v[4], v[0]); v[0] = v[4]; v[2] = iz0(v[2], v[3]); break;
case 141: vc = 4; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[3], v[4]); v[3] = v[4]; v[4] = v[0]; break;
case 61: vc = 5; v[3] = iz0(v[2], v[3]); v[4] = iz0(v[4], v[0]); v[5] = v[0]; break;
case 117: vc = 5; v[0] = iz0(v[0], v[1]); v[4] = iz0(v[3], v[4]); v[5] = v[0]; break;
case 229: vc = 5; v[0] = iz0(v[4], v[0]); v[1] = iz0(v[1], v[2]); v[5] = v[0]; break;
case 205: vc = 5; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[2], v[3]); v[5] = v[0]; break;
case 157: vc = 5; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[3], v[4]); v[5] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 5 && MAX_POLYGON_VERTEX_COUNT == 6
case 125: vc = 6; v[5] = iz0(v[4], v[0]); v[4] = iz0(v[3], v[4]); break;
case 245: vc = 6; v[5] = iz0(v[4], v[0]); v[0] = iz0(v[0], v[1]); break;
case 237: vc = 6; v[5] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); break;
case 221: vc = 6; v[5] = v[4]; v[4] = v[3]; v[3] = iz0(v[2], v[3]); v[2] = iz0(v[1], v[2]); break;
case 189: vc = 6; v[5] = v[4]; v[4] = iz0(v[3], v[4]); v[3] = iz0(v[2], v[3]); break;
#elif MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 5 && MAX_POLYGON_VERTEX_COUNT > 6
case 125: vc = 6; v[5] = iz0(v[4], v[0]); v[4] = iz0(v[3], v[4]); v[6] = v[0]; break;
case 245: vc = 6; v[5] = iz0(v[4], v[0]); v[0] = iz0(v[0], v[1]); v[6] = v[0]; break;
case 237: vc = 6; v[5] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); v[6] = v[0]; break;
case 221: vc = 6; v[5] = v[4]; v[4] = v[3]; v[3] = iz0(v[2], v[3]); v[2] = iz0(v[1], v[2]); v[6] = v[0]; break;
case 189: vc = 6; v[5] = v[4]; v[4] = iz0(v[3], v[4]); v[3] = iz0(v[2], v[3]); v[6] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 6 && MAX_POLYGON_VERTEX_COUNT >= 7
case 6: vc = 0; break;
case 510: vc = 6; v[6] = v[0]; break;
case 14: vc = 3; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[5], v[0]); v[3] = v[0]; break;
case 22: vc = 3; v[0] = iz0(v[0], v[1]); v[2] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 38: vc = 3; v[0] = iz0(v[2], v[3]); v[1] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 70: vc = 3; v[0] = v[3]; v[1] = iz0(v[3], v[4]); v[2] = iz0(v[2], v[3]); break;
case 134: vc = 3; v[0] = iz0(v[3], v[4]); v[1] = v[4]; v[2] = iz0(v[4], v[5]); v[3] = v[0]; break;
case 262: vc = 3; v[1] = v[5]; v[2] = iz0(v[5], v[0]); v[0] = iz0(v[4], v[5]); v[3] = v[0]; break;
case 30: vc = 4; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[5], v[0]); v[4] = v[0]; break;
case 54: vc = 4; v[0] = iz0(v[0], v[1]); v[3] = iz0(v[2], v[3]); v[4] = v[0]; break;
case 102: vc = 4; v[0] = iz0(v[3], v[4]); v[1] = iz0(v[1], v[2]); v[4] = v[0]; break;
case 198: vc = 4; v[0] = v[4]; v[1] = iz0(v[4], v[5]); v[2] = iz0(v[2], v[3]); break;
case 390: vc = 4; v[1] = v[5]; v[2] = iz0(v[5], v[0]); v[0] = v[4]; v[3] = iz0(v[3], v[4]); break;
case 270: vc = 4; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[4], v[5]); v[3] = v[5]; v[4] = v[0]; break;
case 62: vc = 5; v[3] = iz0(v[2], v[3]); v[4] = iz0(v[5], v[0]); v[5] = v[0]; break;
case 118: vc = 5; v[0] = iz0(v[0], v[1]); v[4] = iz0(v[3], v[4]); v[5] = v[0]; break;
case 230: vc = 5; v[0] = iz0(v[4], v[5]); v[1] = iz0(v[1], v[2]); v[5] = v[0]; break;
case 454: vc = 5; v[1] = iz0(v[5], v[0]); v[0] = v[5]; v[2] = iz0(v[2], v[3]); break;
case 398: vc = 5; v[2] = iz0(v[0], v[1]); v[1] = v[0]; v[0] = v[5]; v[3] = iz0(v[3], v[4]); break;
case 286: vc = 5; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[4], v[5]); v[4] = v[5]; v[5] = v[0]; break;
case 126: vc = 6; v[4] = iz0(v[3], v[4]); v[5] = iz0(v[5], v[0]); v[6] = v[0]; break;
case 246: vc = 6; v[0] = iz0(v[0], v[1]); v[5] = iz0(v[4], v[5]); v[6] = v[0]; break;
case 486: vc = 6; v[0] = iz0(v[5], v[0]); v[1] = iz0(v[1], v[2]); v[6] = v[0]; break;
case 462: vc = 6; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[2], v[3]); v[6] = v[0]; break;
case 414: vc = 6; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[3], v[4]); v[6] = v[0]; break;
case 318: vc = 6; v[3] = iz0(v[2], v[3]); v[4] = iz0(v[4], v[5]); v[6] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 6 && MAX_POLYGON_VERTEX_COUNT == 7
case 254: vc = 7; v[6] = iz0(v[5], v[0]); v[5] = iz0(v[4], v[5]); break;
case 502: vc = 7; v[6] = iz0(v[5], v[0]); v[0] = iz0(v[0], v[1]); break;
case 494: vc = 7; v[6] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); break;
case 478: vc = 7; v[6] = v[0]; v[0] = v[1]; v[1] = iz0(v[1], v[2]); v[2] = iz0(v[2], v[3]); break;
case 446: vc = 7; v[6] = v[5]; v[5] = v[4]; v[4] = iz0(v[3], v[4]); v[3] = iz0(v[2], v[3]); break;
case 382: vc = 7; v[6] = v[5]; v[5] = iz0(v[4], v[5]); v[4] = iz0(v[3], v[4]); break;
#elif MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 6 && MAX_POLYGON_VERTEX_COUNT > 7
case 254: vc = 7; v[6] = iz0(v[5], v[0]); v[5] = iz0(v[4], v[5]); v[7] = v[0]; break;
case 502: vc = 7; v[6] = iz0(v[5], v[0]); v[0] = iz0(v[0], v[1]); v[7] = v[0]; break;
case 494: vc = 7; v[6] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); v[7] = v[0]; break;
case 478: vc = 7; v[6] = v[0]; v[0] = v[1]; v[1] = iz0(v[1], v[2]); v[2] = iz0(v[2], v[3]); v[7] = v[0]; break;
case 446: vc = 7; v[6] = v[5]; v[5] = v[4]; v[4] = iz0(v[3], v[4]); v[3] = iz0(v[2], v[3]); v[7] = v[0]; break;
case 382: vc = 7; v[6] = v[5]; v[5] = iz0(v[4], v[5]); v[4] = iz0(v[3], v[4]); v[7] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 7 && MAX_POLYGON_VERTEX_COUNT >= 8
case 7: vc = 0; break;
case 1023: vc = 7; v[7] = v[0]; break;
case 15: vc = 3; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[6], v[0]); v[3] = v[0]; break;
case 23: vc = 3; v[0] = iz0(v[0], v[1]); v[2] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 39: vc = 3; v[0] = iz0(v[2], v[3]); v[1] = iz0(v[1], v[2]); v[3] = v[0]; break;
case 71: vc = 3; v[0] = v[3]; v[1] = iz0(v[3], v[4]); v[2] = iz0(v[2], v[3]); break;
case 135: vc = 3; v[0] = iz0(v[3], v[4]); v[1] = v[4]; v[2] = iz0(v[4], v[5]); v[3] = v[0]; break;
case 263: vc = 3; v[0] = iz0(v[4], v[5]); v[1] = v[5]; v[2] = iz0(v[5], v[6]); v[3] = v[0]; break;
case 519: vc = 3; v[1] = v[6]; v[2] = iz0(v[6], v[0]); v[0] = iz0(v[5], v[6]); v[3] = v[0]; break;
case 31: vc = 4; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[6], v[0]); v[4] = v[0]; break;
case 55: vc = 4; v[0] = iz0(v[0], v[1]); v[3] = iz0(v[2], v[3]); v[4] = v[0]; break;
case 103: vc = 4; v[0] = iz0(v[3], v[4]); v[1] = iz0(v[1], v[2]); v[4] = v[0]; break;
case 199: vc = 4; v[0] = v[4]; v[1] = iz0(v[4], v[5]); v[2] = iz0(v[2], v[3]); break;
case 391: vc = 4; v[0] = v[4]; v[1] = v[5]; v[2] = iz0(v[5], v[6]); v[3] = iz0(v[3], v[4]); break;
case 775: vc = 4; v[1] = v[5]; v[2] = v[6]; v[3] = iz0(v[6], v[0]); v[0] = iz0(v[4], v[5]); v[4] = v[0]; break;
case 527: vc = 4; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[5], v[6]); v[3] = v[6]; v[4] = v[0]; break;
case 63: vc = 5; v[3] = iz0(v[2], v[3]); v[4] = iz0(v[6], v[0]); v[5] = v[0]; break;
case 119: vc = 5; v[0] = iz0(v[0], v[1]); v[4] = iz0(v[3], v[4]); v[5] = v[0]; break;
case 231: vc = 5; v[0] = iz0(v[4], v[5]); v[1] = iz0(v[1], v[2]); v[5] = v[0]; break;
case 455: vc = 5; v[0] = v[5]; v[1] = iz0(v[5], v[6]); v[2] = iz0(v[2], v[3]); break;
case 903: vc = 5; v[1] = v[6]; v[2] = iz0(v[6], v[0]); v[0] = v[5]; v[3] = iz0(v[3], v[4]); break;
case 783: vc = 5; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[4], v[5]); v[3] = v[5]; v[4] = v[6]; v[5] = v[0]; break;
case 543: vc = 5; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[5], v[6]); v[4] = v[6]; v[5] = v[0]; break;
case 127: vc = 6; v[4] = iz0(v[3], v[4]); v[5] = iz0(v[6], v[0]); v[6] = v[0]; break;
case 247: vc = 6; v[0] = iz0(v[0], v[1]); v[5] = iz0(v[4], v[5]); v[6] = v[0]; break;
case 487: vc = 6; v[0] = iz0(v[5], v[6]); v[1] = iz0(v[1], v[2]); v[6] = v[0]; break;
case 967: vc = 6; v[1] = iz0(v[6], v[0]); v[0] = v[6]; v[2] = iz0(v[2], v[3]); break;
case 911: vc = 6; v[2] = iz0(v[0], v[1]); v[1] = v[0]; v[0] = v[6]; v[3] = iz0(v[3], v[4]); break;
case 799: vc = 6; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[4], v[5]); v[4] = v[5]; v[5] = v[6]; v[6] = v[0]; break;
case 575: vc = 6; v[3] = iz0(v[2], v[3]); v[4] = iz0(v[5], v[6]); v[5] = v[6]; v[6] = v[0]; break;
case 255: vc = 7; v[5] = iz0(v[4], v[5]); v[6] = iz0(v[6], v[0]); v[7] = v[0]; break;
case 503: vc = 7; v[0] = iz0(v[0], v[1]); v[6] = iz0(v[5], v[6]); v[7] = v[0]; break;
case 999: vc = 7; v[0] = iz0(v[6], v[0]); v[1] = iz0(v[1], v[2]); v[7] = v[0]; break;
case 975: vc = 7; v[1] = iz0(v[0], v[1]); v[2] = iz0(v[2], v[3]); v[7] = v[0]; break;
case 927: vc = 7; v[2] = iz0(v[1], v[2]); v[3] = iz0(v[3], v[4]); v[7] = v[0]; break;
case 831: vc = 7; v[3] = iz0(v[2], v[3]); v[4] = iz0(v[4], v[5]); v[7] = v[0]; break;
case 639: vc = 7; v[4] = iz0(v[3], v[4]); v[5] = iz0(v[5], v[6]); v[7] = v[0]; break;
#endif
#if MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 7 && MAX_POLYGON_VERTEX_COUNT == 8
case 511: vc = 8; v[7] = iz0(v[6], v[0]); v[6] = iz0(v[5], v[6]); break;
case 1015: vc = 8; v[7] = iz0(v[6], v[0]); v[0] = iz0(v[0], v[1]); break;
case 1007: vc = 8; v[7] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); break;
case 991: vc = 8; v[7] = v[0]; v[0] = v[1]; v[1] = iz0(v[1], v[2]); v[2] = iz0(v[2], v[3]); break;
case 959: vc = 8; v[7] = v[6]; v[6] = v[5]; v[5] = v[4]; v[4] = iz0(v[3], v[4]); v[3] = iz0(v[2], v[3]); break;
case 895: vc = 8; v[7] = v[6]; v[6] = v[5]; v[5] = iz0(v[4], v[5]); v[4] = iz0(v[3], v[4]); break;
case 767: vc = 8; v[7] = v[6]; v[6] = iz0(v[5], v[6]); v[5] = iz0(v[4], v[5]); break;
#elif MIN_POLYGON_VERTEX_COUNT_BEFORE_CLIPPING <= 7 && MAX_POLYGON_VERTEX_COUNT > 8
case 511: vc = 8; v[7] = iz0(v[6], v[0]); v[6] = iz0(v[5], v[6]); v[8] = v[0]; break;
case 1015: vc = 8; v[7] = iz0(v[6], v[0]); v[0] = iz0(v[0], v[1]); v[8] = v[0]; break;
case 1007: vc = 8; v[7] = v[0]; v[0] = iz0(v[0], v[1]); v[1] = iz0(v[1], v[2]); v[8] = v[0]; break;
case 991: vc = 8; v[7] = v[0]; v[0] = v[1]; v[1] = iz0(v[1], v[2]); v[2] = iz0(v[2], v[3]); v[8] = v[0]; break;
case 959: vc = 8; v[7] = v[6]; v[6] = v[5]; v[5] = v[4]; v[4] = iz0(v[3], v[4]); v[3] = iz0(v[2], v[3]); v[8] = v[0]; break;
case 895: vc = 8; v[7] = v[6]; v[6] = v[5]; v[5] = iz0(v[4], v[5]); v[4] = iz0(v[3], v[4]); v[8] = v[0]; break;
case 767: vc = 8; v[7] = v[6]; v[6] = iz0(v[5], v[6]); v[5] = iz0(v[4], v[5]); v[8] = v[0]; break;
#endif
// AUTOGENERATED PART END
default:
// This should never happen. Just pretend the polygon is below the
// horizon.
vc = 0;
break;
};
return vc;
}
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