mirror of
https://github.com/yquake2/yquake2remaster.git
synced 2025-01-11 12:21:42 +00:00
730 lines
12 KiB
C
730 lines
12 KiB
C
/*
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* Copyright (C) 1997-2001 Id Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* =======================================================================
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*
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* Warps. Used on water surfaces und for skybox rotation.
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*
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* =======================================================================
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*/
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#include "header/local.h"
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#define TURBSCALE (256.0 / (2 * M_PI))
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#define SUBDIVIDE_SIZE 64
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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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extern model_t *loadmodel;
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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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msurface_t *warpface;
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int skytexorder[6] = {0, 2, 1, 3, 4, 5};
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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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float r_turbsin[] = {
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#include "constants/warpsin.h"
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};
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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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int st_to_vec[6][3] = {
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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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};
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int vec_to_st[6][3] = {
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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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};
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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
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R_BoundPoly(int numverts, float *verts, vec3_t mins, vec3_t maxs)
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{
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int i, j;
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float *v;
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mins[0] = mins[1] = mins[2] = 9999;
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maxs[0] = maxs[1] = maxs[2] = -9999;
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v = verts;
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for (i = 0; i < numverts; i++)
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{
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for (j = 0; j < 3; j++, v++)
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{
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if (*v < mins[j])
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{
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mins[j] = *v;
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}
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if (*v > maxs[j])
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{
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maxs[j] = *v;
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}
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}
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}
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}
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void
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R_SubdividePolygon(int numverts, float *verts)
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{
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int i, j, k;
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vec3_t mins, maxs;
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float m;
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float *v;
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vec3_t front[64], back[64];
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int f, b;
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float dist[64];
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float frac;
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glpoly_t *poly;
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float s, t;
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vec3_t total;
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float total_s, total_t;
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if (numverts > 60)
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{
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ri.Sys_Error(ERR_DROP, "numverts = %i", numverts);
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}
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R_BoundPoly(numverts, verts, mins, maxs);
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for (i = 0; i < 3; i++)
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{
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m = (mins[i] + maxs[i]) * 0.5;
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m = SUBDIVIDE_SIZE * floor(m / SUBDIVIDE_SIZE + 0.5);
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if (maxs[i] - m < 8)
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{
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continue;
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}
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if (m - mins[i] < 8)
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{
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continue;
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}
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/* cut it */
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v = verts + i;
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for (j = 0; j < numverts; j++, v += 3)
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{
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dist[j] = *v - m;
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}
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/* wrap cases */
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dist[j] = dist[0];
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v -= i;
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VectorCopy(verts, v);
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f = b = 0;
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v = verts;
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for (j = 0; j < numverts; j++, v += 3)
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{
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if (dist[j] >= 0)
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{
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VectorCopy(v, front[f]);
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f++;
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}
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if (dist[j] <= 0)
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{
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VectorCopy(v, back[b]);
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b++;
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}
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if ((dist[j] == 0) || (dist[j + 1] == 0))
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{
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continue;
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}
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if ((dist[j] > 0) != (dist[j + 1] > 0))
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{
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/* clip point */
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frac = dist[j] / (dist[j] - dist[j + 1]);
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for (k = 0; k < 3; k++)
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{
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front[f][k] = back[b][k] = v[k] + frac * (v[3 + k] - v[k]);
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}
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f++;
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b++;
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}
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}
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R_SubdividePolygon(f, front[0]);
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R_SubdividePolygon(b, back[0]);
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return;
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}
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/* add a point in the center to help keep warp valid */
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poly = Hunk_Alloc(sizeof(glpoly_t) + ((numverts - 4) + 2) * VERTEXSIZE * sizeof(float));
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poly->next = warpface->polys;
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warpface->polys = poly;
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poly->numverts = numverts + 2;
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VectorClear(total);
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total_s = 0;
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total_t = 0;
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for (i = 0; i < numverts; i++, verts += 3)
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{
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VectorCopy(verts, poly->verts[i + 1]);
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s = DotProduct(verts, warpface->texinfo->vecs[0]);
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t = DotProduct(verts, warpface->texinfo->vecs[1]);
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total_s += s;
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total_t += t;
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VectorAdd(total, verts, total);
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poly->verts[i + 1][3] = s;
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poly->verts[i + 1][4] = t;
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}
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VectorScale(total, (1.0 / numverts), poly->verts[0]);
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poly->verts[0][3] = total_s / numverts;
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poly->verts[0][4] = total_t / numverts;
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/* copy first vertex to last */
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memcpy(poly->verts[i + 1], poly->verts[1], sizeof(poly->verts[0]));
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}
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/*
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* Breaks a polygon up along axial 64 unit
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* boundaries so that turbulent and sky warps
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* can be done reasonably.
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*/
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void
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R_SubdivideSurface(msurface_t *fa)
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{
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vec3_t verts[64];
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int numverts;
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int i;
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int lindex;
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float *vec;
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warpface = fa;
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/* convert edges back to a normal polygon */
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numverts = 0;
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for (i = 0; i < fa->numedges; i++)
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{
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lindex = loadmodel->surfedges[fa->firstedge + i];
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if (lindex > 0)
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{
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vec = loadmodel->vertexes[loadmodel->edges[lindex].v[0]].position;
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}
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else
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{
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vec = loadmodel->vertexes[loadmodel->edges[-lindex].v[1]].position;
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}
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VectorCopy(vec, verts[numverts]);
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numverts++;
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}
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R_SubdividePolygon(numverts, verts[0]);
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}
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/*
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* Does a water warp on the pre-fragmented glpoly_t chain
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*/
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void
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R_EmitWaterPolys(msurface_t *fa)
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{
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glpoly_t *p, *bp;
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float *v;
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int i;
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float s, t, os, ot;
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float scroll;
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float rdt = r_newrefdef.time;
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if (fa->texinfo->flags & SURF_FLOWING)
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{
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scroll = -64 * ((r_newrefdef.time * 0.5) - (int)(r_newrefdef.time * 0.5));
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}
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else
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{
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scroll = 0;
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}
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for (bp = fa->polys; bp; bp = bp->next)
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{
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p = bp;
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qglBegin(GL_TRIANGLE_FAN);
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for (i = 0, v = p->verts[0]; i < p->numverts; i++, v += VERTEXSIZE)
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{
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os = v[3];
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ot = v[4];
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s = os + r_turbsin[(int)((ot * 0.125 + r_newrefdef.time) * TURBSCALE) & 255];
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s += scroll;
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s *= (1.0 / 64);
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t = ot + r_turbsin[(int)((os * 0.125 + rdt) * TURBSCALE) & 255];
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t *= (1.0 / 64);
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qglTexCoord2f(s, t);
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qglVertex3fv(v);
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}
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qglEnd();
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}
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}
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void
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R_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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{
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axis = 1;
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}
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else
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{
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axis = 0;
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}
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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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{
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axis = 3;
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}
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else
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{
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axis = 2;
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}
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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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{
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axis = 5;
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}
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else
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{
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axis = 4;
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}
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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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{
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dv = vecs[j - 1];
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}
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else
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{
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dv = -vecs[-j - 1];
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}
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if (dv < 0.001)
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{
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continue; /* don't divide by zero */
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}
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j = vec_to_st[axis][0];
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if (j < 0)
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{
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s = -vecs[-j - 1] / dv;
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}
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else
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{
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s = vecs[j - 1] / dv;
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}
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j = vec_to_st[axis][1];
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if (j < 0)
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{
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t = -vecs[-j - 1] / dv;
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}
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else
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{
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t = vecs[j - 1] / dv;
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}
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if (s < skymins[0][axis])
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{
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skymins[0][axis] = s;
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}
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if (t < skymins[1][axis])
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{
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skymins[1][axis] = t;
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}
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if (s > skymaxs[0][axis])
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{
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skymaxs[0][axis] = s;
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}
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if (t > skymaxs[1][axis])
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{
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skymaxs[1][axis] = t;
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}
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}
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}
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void
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R_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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{
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ri.Sys_Error(ERR_DROP, "R_ClipSkyPolygon: MAX_CLIP_VERTS");
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}
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if (stage == 6)
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{
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/* fully clipped, so draw it */
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R_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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{
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sides[i] = SIDE_ON;
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}
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dists[i] = d;
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}
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if (!front || !back)
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{
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/* not clipped */
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R_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) ||
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(sides[i + 1] == SIDE_ON) ||
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(sides[i + 1] == sides[i]))
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{
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continue;
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}
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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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R_ClipSkyPolygon(newc[0], newv[0][0], stage + 1);
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R_ClipSkyPolygon(newc[1], newv[1][0], stage + 1);
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}
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void
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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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}
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R_ClipSkyPolygon(p->numverts, verts[0], 0);
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}
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}
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void
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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
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R_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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if (gl_farsee->value == 0)
|
|
{
|
|
b[0] = s * 2300;
|
|
b[1] = t * 2300;
|
|
b[2] = 2300;
|
|
}
|
|
else
|
|
{
|
|
b[0] = s * 4096;
|
|
b[1] = t * 4096;
|
|
b[2] = 4096;
|
|
}
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
k = st_to_vec[axis][j];
|
|
|
|
if (k < 0)
|
|
{
|
|
v[j] = -b[-k - 1];
|
|
}
|
|
else
|
|
{
|
|
v[j] = b[k - 1];
|
|
}
|
|
}
|
|
|
|
/* avoid bilerp seam */
|
|
s = (s + 1) * 0.5;
|
|
t = (t + 1) * 0.5;
|
|
|
|
if (s < sky_min)
|
|
{
|
|
s = sky_min;
|
|
}
|
|
else if (s > sky_max)
|
|
{
|
|
s = sky_max;
|
|
}
|
|
|
|
if (t < sky_min)
|
|
{
|
|
t = sky_min;
|
|
}
|
|
else if (t > sky_max)
|
|
{
|
|
t = sky_max;
|
|
}
|
|
|
|
t = 1.0 - t;
|
|
qglTexCoord2f(s, t);
|
|
qglVertex3fv(v);
|
|
}
|
|
|
|
void
|
|
R_DrawSkyBox(void)
|
|
{
|
|
int i;
|
|
|
|
if (skyrotate)
|
|
{ /* check for no sky at all */
|
|
for (i = 0; i < 6; i++)
|
|
{
|
|
if ((skymins[0][i] < skymaxs[0][i]) &&
|
|
(skymins[1][i] < skymaxs[1][i]))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == 6)
|
|
{
|
|
return; /* nothing visible */
|
|
}
|
|
}
|
|
|
|
qglPushMatrix();
|
|
qglTranslatef(r_origin[0], r_origin[1], r_origin[2]);
|
|
qglRotatef(r_newrefdef.time * skyrotate, skyaxis[0], skyaxis[1], skyaxis[2]);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
{
|
|
if (skyrotate)
|
|
{
|
|
skymins[0][i] = -1;
|
|
skymins[1][i] = -1;
|
|
skymaxs[0][i] = 1;
|
|
skymaxs[1][i] = 1;
|
|
}
|
|
|
|
if ((skymins[0][i] >= skymaxs[0][i]) ||
|
|
(skymins[1][i] >= skymaxs[1][i]))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
R_Bind(sky_images[skytexorder[i]]->texnum);
|
|
|
|
qglBegin(GL_QUADS);
|
|
R_MakeSkyVec(skymins[0][i], skymins[1][i], i);
|
|
R_MakeSkyVec(skymins[0][i], skymaxs[1][i], i);
|
|
R_MakeSkyVec(skymaxs[0][i], skymaxs[1][i], i);
|
|
R_MakeSkyVec(skymaxs[0][i], skymins[1][i], i);
|
|
qglEnd();
|
|
}
|
|
|
|
qglPopMatrix();
|
|
}
|
|
|
|
void
|
|
R_SetSky(char *name, float rotate, vec3_t axis)
|
|
{
|
|
int i;
|
|
char pathname[MAX_QPATH];
|
|
|
|
strncpy(skyname, name, sizeof(skyname) - 1);
|
|
skyrotate = rotate;
|
|
VectorCopy(axis, skyaxis);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
{
|
|
if (qglColorTableEXT && gl_ext_palettedtexture->value)
|
|
{
|
|
Com_sprintf(pathname, sizeof(pathname), "env/%s%s.pcx",
|
|
skyname, suf[i]);
|
|
}
|
|
else
|
|
{
|
|
Com_sprintf(pathname, sizeof(pathname), "env/%s%s.tga",
|
|
skyname, suf[i]);
|
|
}
|
|
|
|
sky_images[i] = R_FindImage(pathname, it_sky);
|
|
|
|
if (!sky_images[i])
|
|
{
|
|
sky_images[i] = r_notexture;
|
|
}
|
|
|
|
sky_min = 1.0 / 512;
|
|
sky_max = 511.0 / 512;
|
|
}
|
|
}
|
|
|