forked from valve/halflife-sdk
352 lines
6.6 KiB
C
352 lines
6.6 KiB
C
/***
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*
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* Copyright (c) 1996-2002, Valve LLC. All rights reserved.
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*
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* This product contains software technology licensed from Id
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* Software, Inc. ("Id Technology"). Id Technology (c) 1996 Id Software, Inc.
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* All Rights Reserved.
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*
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****/
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// tristrip - convert triangle list into tristrips and fans
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#pragma warning( disable : 4244 )
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#pragma warning( disable : 4237 )
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#pragma warning( disable : 4305 )
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include "cmdlib.h"
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#include "lbmlib.h"
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#include "scriplib.h"
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#include "mathlib.h"
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#include "..\..\engine\studio.h"
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#include "studiomdl.h"
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int used[MAXSTUDIOTRIANGLES];
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// the command list holds counts and s/t values that are valid for
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// every frame
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short commands[MAXSTUDIOTRIANGLES * 13];
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int numcommands;
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// all frames will have their vertexes rearranged and expanded
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// so they are in the order expected by the command list
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int allverts, alltris;
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int stripverts[MAXSTUDIOTRIANGLES+2];
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int striptris[MAXSTUDIOTRIANGLES+2];
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int stripcount;
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int neighbortri[MAXSTUDIOTRIANGLES][3];
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int neighboredge[MAXSTUDIOTRIANGLES][3];
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s_trianglevert_t (*triangles)[3];
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s_mesh_t *pmesh;
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void FindNeighbor (int starttri, int startv)
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{
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s_trianglevert_t m1, m2;
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int j;
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s_trianglevert_t *last, *check;
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int k;
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// used[starttri] |= (1 << startv);
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last = &triangles[starttri][0];
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m1 = last[(startv+1)%3];
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m2 = last[(startv+0)%3];
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for (j=starttri+1, check=&triangles[starttri+1][0] ; j<pmesh->numtris ; j++, check += 3)
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{
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if (used[j] == 7)
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continue;
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for (k=0 ; k<3 ; k++)
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{
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if (memcmp(&check[k],&m1,sizeof(m1)))
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continue;
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if (memcmp(&check[ (k+1)%3 ],&m2,sizeof(m2)))
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continue;
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neighbortri[starttri][startv] = j;
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neighboredge[starttri][startv] = k;
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neighbortri[j][k] = starttri;
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neighboredge[j][k] = startv;
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used[starttri] |= (1 << startv);
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used[j] |= (1 << k);
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return;
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}
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}
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}
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/*
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================
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StripLength
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================
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*/
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int StripLength (int starttri, int startv)
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{
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int j;
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int k;
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used[starttri] = 2;
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stripverts[0] = (startv)%3;
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stripverts[1] = (startv+1)%3;
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stripverts[2] = (startv+2)%3;
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striptris[0] = starttri;
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striptris[1] = starttri;
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striptris[2] = starttri;
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stripcount = 3;
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while( 1 )
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{
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if (stripcount & 1)
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{
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j = neighbortri[starttri][(startv+1)%3];
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k = neighboredge[starttri][(startv+1)%3];
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}
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else
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{
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j = neighbortri[starttri][(startv+2)%3];
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k = neighboredge[starttri][(startv+2)%3];
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}
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if (j == -1 || used[j])
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goto done;
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stripverts[stripcount] = (k+2)%3;
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striptris[stripcount] = j;
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stripcount++;
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used[j] = 2;
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starttri = j;
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startv = k;
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}
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done:
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// clear the temp used flags
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for (j=0 ; j<pmesh->numtris ; j++)
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if (used[j] == 2)
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used[j] = 0;
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return stripcount;
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}
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/*
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===========
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FanLength
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===========
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*/
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int FanLength (int starttri, int startv)
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{
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int j;
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int k;
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used[starttri] = 2;
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stripverts[0] = (startv)%3;
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stripverts[1] = (startv+1)%3;
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stripverts[2] = (startv+2)%3;
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striptris[0] = starttri;
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striptris[1] = starttri;
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striptris[2] = starttri;
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stripcount = 3;
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while( 1 )
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{
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j = neighbortri[starttri][(startv+2)%3];
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k = neighboredge[starttri][(startv+2)%3];
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if (j == -1 || used[j])
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goto done;
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stripverts[stripcount] = (k+2)%3;
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striptris[stripcount] = j;
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stripcount++;
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used[j] = 2;
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starttri = j;
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startv = k;
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}
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done:
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// clear the temp used flags
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for (j=0 ; j<pmesh->numtris ; j++)
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if (used[j] == 2)
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used[j] = 0;
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return stripcount;
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}
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/*
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================
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BuildTris
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Generate a list of trifans or strips
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for the model, which holds for all frames
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================
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*/
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int numcommandnodes;
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int BuildTris (s_trianglevert_t (*x)[3], s_mesh_t *y, byte **ppdata )
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{
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int i, j, k, m;
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int startv;
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int len, bestlen, besttype;
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int bestverts[MAXSTUDIOTRIANGLES];
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int besttris[MAXSTUDIOTRIANGLES];
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int peak[MAXSTUDIOTRIANGLES];
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int type;
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int total = 0;
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long t;
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int maxlen;
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triangles = x;
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pmesh = y;
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t = time( NULL );
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for (i=0 ; i<pmesh->numtris ; i++)
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{
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neighbortri[i][0] = neighbortri[i][1] = neighbortri[i][2] = -1;
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used[i] = 0;
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peak[i] = pmesh->numtris;
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}
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// printf("finding neighbors\n");
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for (i=0 ; i<pmesh->numtris; i++)
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{
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for (k = 0; k < 3; k++)
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{
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if (used[i] & (1 << k))
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continue;
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FindNeighbor( i, k );
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}
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// printf("%d", used[i] );
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}
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// printf("\n");
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//
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// build tristrips
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//
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numcommandnodes = 0;
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numcommands = 0;
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memset (used, 0, sizeof(used));
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for (i=0 ; i<pmesh->numtris ;)
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{
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// pick an unused triangle and start the trifan
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if (used[i])
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{
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i++;
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continue;
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}
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maxlen = 9999;
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bestlen = 0;
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m = 0;
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for (k = i; k < pmesh->numtris && bestlen < 127; k++)
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{
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int localpeak = 0;
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if (used[k])
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continue;
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if (peak[k] <= bestlen)
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continue;
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m++;
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for (type = 0 ; type < 2 ; type++)
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{
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for (startv =0 ; startv < 3 ; startv++)
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{
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if (type == 1)
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len = FanLength (k, startv);
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else
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len = StripLength (k, startv);
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if (len > 127)
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{
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// skip these, they are too long to encode
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}
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else if (len > bestlen)
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{
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besttype = type;
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bestlen = len;
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for (j=0 ; j<bestlen ; j++)
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{
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besttris[j] = striptris[j];
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bestverts[j] = stripverts[j];
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}
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// printf("%d %d\n", k, bestlen );
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}
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if (len > localpeak)
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localpeak = len;
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}
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}
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peak[k] = localpeak;
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if (localpeak == maxlen)
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break;
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}
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total += (bestlen - 2);
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// printf("%d (%d) %d\n", bestlen, pmesh->numtris - total, i );
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maxlen = bestlen;
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// mark the tris on the best strip as used
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for (j=0 ; j<bestlen ; j++)
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used[besttris[j]] = 1;
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if (besttype == 1)
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commands[numcommands++] = -bestlen;
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else
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commands[numcommands++] = bestlen;
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for (j=0 ; j<bestlen ; j++)
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{
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s_trianglevert_t *tri;
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tri = &triangles[besttris[j]][bestverts[j]];
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commands[numcommands++] = tri->vertindex;
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commands[numcommands++] = tri->normindex;
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commands[numcommands++] = tri->s;
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commands[numcommands++] = tri->t;
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}
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// printf("%d ", bestlen - 2 );
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numcommandnodes++;
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if (t != time(NULL))
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{
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printf("%2d%%\r", (total * 100) / pmesh->numtris );
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t = time(NULL);
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}
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}
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commands[numcommands++] = 0; // end of list marker
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*ppdata = (byte *)commands;
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// printf("%d %d %d\n", numcommandnodes, numcommands, pmesh->numtris );
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return numcommands * sizeof( short );
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}
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