mirror of
https://github.com/blendogames/thirtyflightsofloving.git
synced 2024-11-14 00:21:18 +00:00
85a20a70c2
Removed legacy GL_NV_texture_shader water warp effect. Added r_subdivide_size cvar to control polygon subdivision of warp surfaces. Added preliminary support for warp lightmaps.
450 lines
9 KiB
C
450 lines
9 KiB
C
/*
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===========================================================================
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Copyright (C) 1997-2001 Id Software, Inc.
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This file is part of Quake 2 source code.
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Quake 2 source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake 2 source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake 2 source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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// r_sky.c -- sky rendering
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// Moved from r_warp.c
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#include "r_local.h"
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char skyname[MAX_QPATH];
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float skyrotate;
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vec3_t skyaxis;
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image_t *sky_images[6];
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vec3_t skyclip[6] = {
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{1,1,0},
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{1,-1,0},
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{0,-1,1},
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{0,1,1},
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{1,0,1},
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{-1,0,1}
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};
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int c_sky;
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// 1 = s, 2 = t, 3 = 2048
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int st_to_vec[6][3] =
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{
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{3,-1,2},
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{-3,1,2},
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{1,3,2},
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{-1,-3,2},
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{-2,-1,3}, // 0 degrees yaw, look straight up
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{2,-1,-3} // look straight down
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// {-1,2,3},
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// {1,2,-3}
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};
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// s = [0]/[2], t = [1]/[2]
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int vec_to_st[6][3] =
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{
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{-2,3,1},
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{2,3,-1},
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{1,3,2},
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{-1,3,-2},
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{-2,-1,3},
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{-2,1,-3}
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// {-1,2,3},
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// {1,2,-3}
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};
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float skymins[2][6], skymaxs[2][6];
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float sky_min, sky_max;
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void DrawSkyPolygon (int nump, vec3_t vecs)
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{
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int i,j;
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vec3_t v, av;
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float s, t, dv;
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int axis;
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float *vp;
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c_sky++;
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// decide which face it maps to
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VectorCopy (vec3_origin, v);
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for (i=0, vp=vecs ; i<nump ; i++, vp+=3)
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{
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VectorAdd (vp, v, v);
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}
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av[0] = fabs(v[0]);
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av[1] = fabs(v[1]);
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av[2] = fabs(v[2]);
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if (av[0] > av[1] && av[0] > av[2])
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{
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if (v[0] < 0)
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axis = 1;
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else
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axis = 0;
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}
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else if (av[1] > av[2] && av[1] > av[0])
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{
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if (v[1] < 0)
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axis = 3;
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else
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axis = 2;
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}
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else
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{
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if (v[2] < 0)
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axis = 5;
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else
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axis = 4;
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}
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// project new texture coords
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for (i=0 ; i<nump ; i++, vecs+=3)
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{
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j = vec_to_st[axis][2];
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if (j > 0)
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dv = vecs[j - 1];
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else
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dv = -vecs[-j - 1];
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if (dv < 0.001)
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continue; // don't divide by zero
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j = vec_to_st[axis][0];
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if (j < 0)
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s = -vecs[-j -1] / dv;
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else
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s = vecs[j-1] / dv;
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j = vec_to_st[axis][1];
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if (j < 0)
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t = -vecs[-j -1] / dv;
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else
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t = vecs[j-1] / dv;
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if (s < skymins[0][axis])
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skymins[0][axis] = s;
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if (t < skymins[1][axis])
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skymins[1][axis] = t;
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if (s > skymaxs[0][axis])
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skymaxs[0][axis] = s;
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if (t > skymaxs[1][axis])
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skymaxs[1][axis] = t;
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}
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}
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#define ON_EPSILON 0.1 // point on plane side epsilon
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#define MAX_CLIP_VERTS 64
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void ClipSkyPolygon (int nump, vec3_t vecs, int stage)
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{
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float *norm;
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float *v;
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qboolean front, back;
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float d, e;
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float dists[MAX_CLIP_VERTS];
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int sides[MAX_CLIP_VERTS];
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vec3_t newv[2][MAX_CLIP_VERTS];
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int newc[2];
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int i, j;
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if (nump > MAX_CLIP_VERTS-2)
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VID_Error (ERR_DROP, "ClipSkyPolygon: MAX_CLIP_VERTS");
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if (stage == 6)
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{ // fully clipped, so draw it
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DrawSkyPolygon (nump, vecs);
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return;
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}
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front = back = false;
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norm = skyclip[stage];
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for (i=0, v = vecs ; i<nump ; i++, v+=3)
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{
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d = DotProduct (v, norm);
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if (d > ON_EPSILON)
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{
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front = true;
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sides[i] = SIDE_FRONT;
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}
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else if (d < -ON_EPSILON)
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{
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back = true;
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sides[i] = SIDE_BACK;
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}
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else
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sides[i] = SIDE_ON;
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dists[i] = d;
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}
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if (!front || !back)
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{ // not clipped
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ClipSkyPolygon (nump, vecs, stage+1);
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return;
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}
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// clip it
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sides[i] = sides[0];
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dists[i] = dists[0];
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VectorCopy (vecs, (vecs+(i*3)) );
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newc[0] = newc[1] = 0;
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for (i=0, v = vecs ; i<nump ; i++, v+=3)
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{
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switch (sides[i])
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{
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case SIDE_FRONT:
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VectorCopy (v, newv[0][newc[0]]);
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newc[0]++;
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break;
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case SIDE_BACK:
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VectorCopy (v, newv[1][newc[1]]);
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newc[1]++;
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break;
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case SIDE_ON:
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VectorCopy (v, newv[0][newc[0]]);
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newc[0]++;
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VectorCopy (v, newv[1][newc[1]]);
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newc[1]++;
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break;
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}
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if (sides[i] == SIDE_ON || sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
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continue;
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d = dists[i] / (dists[i] - dists[i+1]);
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for (j=0 ; j<3 ; j++)
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{
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e = v[j] + d*(v[j+3] - v[j]);
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newv[0][newc[0]][j] = e;
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newv[1][newc[1]][j] = e;
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}
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newc[0]++;
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newc[1]++;
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}
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// continue
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ClipSkyPolygon (newc[0], newv[0][0], stage+1);
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ClipSkyPolygon (newc[1], newv[1][0], stage+1);
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}
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/*
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=================
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R_AddSkySurface
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=================
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*/
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void R_AddSkySurface (msurface_t *fa)
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{
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int i;
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vec3_t verts[MAX_CLIP_VERTS];
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glpoly_t *p;
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// calculate vertex values for sky box
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for (p=fa->polys ; p ; p=p->next)
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{
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for (i=0 ; i<p->numverts ; i++)
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{
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// VectorSubtract (p->verts[i], r_origin, verts[i]);
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VectorSubtract (p->verts[i].xyz, r_origin, verts[i]);
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}
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ClipSkyPolygon (p->numverts, verts[0], 0);
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}
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}
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/*
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==============
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R_ClearSkyBox
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==============
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*/
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void R_ClearSkyBox (void)
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{
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int i;
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for (i=0 ; i<6 ; i++)
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{
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skymins[0][i] = skymins[1][i] = 9999;
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skymaxs[0][i] = skymaxs[1][i] = -9999;
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}
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}
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void MakeSkyVec (float s, float t, int axis)
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{
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vec3_t v, b;
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int j, k;
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//Knightmare- 12/26/2001- variable back clipping plane distance
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b[0] = s * r_skydistance->value;
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b[1] = t * r_skydistance->value;
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b[2] = r_skydistance->value;
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//end Knightmare
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for (j=0 ; j<3 ; j++)
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{
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k = st_to_vec[axis][j];
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if (k < 0)
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v[j] = -b[-k - 1];
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else
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v[j] = b[k - 1];
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}
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// avoid bilerp seam
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s = (s+1)*0.5;
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t = (t+1)*0.5;
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if (s < sky_min)
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s = sky_min;
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else if (s > sky_max)
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s = sky_max;
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if (t < sky_min)
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t = sky_min;
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else if (t > sky_max)
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t = sky_max;
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t = 1.0 - t;
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VA_SetElem2(texCoordArray[0][rb_vertex], s, t);
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VA_SetElem3(vertexArray[rb_vertex], v[0], v[1], v[2]);
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VA_SetElem4(colorArray[rb_vertex], 1.0f, 1.0f, 1.0f, 1.0f);
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rb_vertex++;
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}
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/*
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==============
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R_DrawSkyBox
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==============
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*/
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int skytexorder[6] = {0,2,1,3,4,5};
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void R_DrawSkyBox (void)
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{
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int i;
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if (skyrotate)
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{ // check for no sky at all
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for (i=0 ; i<6 ; i++)
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if (skymins[0][i] < skymaxs[0][i]
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&& skymins[1][i] < skymaxs[1][i])
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break;
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if (i == 6)
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return; // nothing visible
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}
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R_SetSkyFog (true); // set sky distance fog
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qglPushMatrix ();
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qglTranslatef (r_origin[0], r_origin[1], r_origin[2]);
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qglRotatef (r_newrefdef.time * skyrotate, skyaxis[0], skyaxis[1], skyaxis[2]);
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for (i=0; i<6; i++)
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{
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if (skyrotate)
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{ // hack, forces full sky to draw when rotating
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skymins[0][i] = -1;
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skymins[1][i] = -1;
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skymaxs[0][i] = 1;
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skymaxs[1][i] = 1;
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}
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if (skymins[0][i] >= skymaxs[0][i]
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|| skymins[1][i] >= skymaxs[1][i])
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continue;
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GL_Bind (sky_images[skytexorder[i]]->texnum);
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rb_vertex = rb_index = 0;
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indexArray[rb_index++] = rb_vertex+0;
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indexArray[rb_index++] = rb_vertex+1;
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indexArray[rb_index++] = rb_vertex+2;
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indexArray[rb_index++] = rb_vertex+0;
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indexArray[rb_index++] = rb_vertex+2;
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indexArray[rb_index++] = rb_vertex+3;
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MakeSkyVec (skymins[0][i], skymins[1][i], i);
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MakeSkyVec (skymins[0][i], skymaxs[1][i], i);
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MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i);
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MakeSkyVec (skymaxs[0][i], skymins[1][i], i);
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RB_RenderMeshGeneric (true);
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}
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qglPopMatrix ();
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R_SetSkyFog (false); // restore normal distance fog
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}
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/*
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============
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R_SetSky
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============
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*/
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// 3dstudio environment map names
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char *suf[6] = {"rt", "bk", "lf", "ft", "up", "dn"};
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void R_SetSky (char *name, float rotate, vec3_t axis)
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{
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int i;
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char pathname[MAX_QPATH];
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float imagesize;
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strncpy (skyname, name, sizeof(skyname)-1);
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skyrotate = rotate;
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VectorCopy (axis, skyaxis);
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for (i=0 ; i<6 ; i++)
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{
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if (r_skymip->integer) { // take less memory
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// r_picmip->integer++; // directly setting cvar values is bad bad bad!!!
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Cvar_SetInteger("r_picmip", r_picmip->integer + 1);
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}
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Com_sprintf (pathname, sizeof(pathname), "env/%s%s.tga", skyname, suf[i]);
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sky_images[i] = R_FindImage (pathname, it_sky);
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// Knightmare- support .jpg skies
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if (!sky_images[i]) {
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Com_sprintf (pathname, sizeof(pathname), "env/%s%s.jpg", skyname, suf[i]);
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sky_images[i] = R_FindImage (pathname, it_sky);
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}
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if (!sky_images[i])
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sky_images[i] = glMedia.notexture;
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if ((sky_images[i]->height == sky_images[i]->width) && (sky_images[i]->width >= 256))
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imagesize = sky_images[i]->width;
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else
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imagesize = 256.0;
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if (r_skymip->integer) { // take less memory
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// r_picmip->integer--; // directly setting cvar values is bad bad bad!!!
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Cvar_SetInteger("r_picmip", r_picmip->integer - 1);
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imagesize = min(512.0, imagesize); // cap at 512
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}
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else
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imagesize = min(1024.0, imagesize); // cap at 1024
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sky_min = 1.0/imagesize; // was 256
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sky_max = (imagesize-1.0)/imagesize;
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/*if (r_skymip->integer) { // take less memory
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// r_picmip->integer--; // directly setting cvar values is bad bad bad!!!
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Cvar_SetInteger("r_picmip", r_picmip->integer - 1);
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sky_min = 1.0/512; // was 256
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sky_max = 511.0/512;
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}
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else // support max of 1024x1024
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{
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sky_min = 1.0/1024; // was 512
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sky_max = 1023.0/1024;
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}*/
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}
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}
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