mirror of
https://github.com/nzp-team/vhlt.git
synced 2024-11-24 21:02:22 +00:00
470 lines
13 KiB
C++
470 lines
13 KiB
C++
#include "bsp5.h"
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// SubdivideFace
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// InitHash
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// HashVec
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// GetVertex
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// GetEdge
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// MakeFaceEdges
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static int subdivides;
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/* a surface has all of the faces that could be drawn on a given plane
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the outside filling stage can remove some of them so a better bsp can be generated */
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// =====================================================================================
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// SubdivideFace
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// If the face is >256 in either texture direction, carve a valid sized
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// piece off and insert the remainder in the next link
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// =====================================================================================
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void SubdivideFace(face_t* f, face_t** prevptr)
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{
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vec_t mins, maxs;
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vec_t v;
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int axis;
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int i;
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dplane_t plane;
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face_t* front;
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face_t* back;
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face_t* next;
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texinfo_t* tex;
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vec3_t temp;
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// special (non-surface cached) faces don't need subdivision
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#ifdef HLCSG_HLBSP_VOIDTEXINFO
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if (f->texturenum == -1)
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{
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return;
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}
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#endif
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tex = &g_texinfo[f->texturenum];
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if (tex->flags & TEX_SPECIAL)
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{
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return;
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}
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if (f->facestyle == face_hint)
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{
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return;
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}
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if (f->facestyle == face_skip)
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{
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return;
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}
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#ifdef ZHLT_NULLTEX // AJM
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if (f->facestyle == face_null)
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return; // ideally these should have their tex_special flag set, so its here jic
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#endif
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#ifdef HLCSG_HLBSP_SOLIDHINT
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if (f->facestyle == face_discardable)
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return;
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#endif
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for (axis = 0; axis < 2; axis++)
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{
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while (1)
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{
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#ifdef HLBSP_SUBDIVIDE_INMID
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const int maxlightmapsize = g_subdivide_size / TEXTURE_STEP + 1;
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int lightmapmins, lightmapmaxs;
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if (f->numpoints == 0)
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{
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break;
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}
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for (i = 0; i < f->numpoints; i++)
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{
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v = DotProduct (f->pts[i], tex->vecs[axis]) + tex->vecs[axis][3];
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if (i == 0 || v < mins)
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{
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mins = v;
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}
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if (i == 0 || v > maxs)
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{
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maxs = v;
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}
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}
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lightmapmins = (int)floor (mins / TEXTURE_STEP - 0.05); // the worst case
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lightmapmaxs = (int)ceil (maxs / TEXTURE_STEP + 0.05); // the worst case
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if (lightmapmaxs - lightmapmins <= maxlightmapsize)
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{
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break;
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}
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#else
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#ifdef ZHLT_64BIT_FIX
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mins = 99999999;
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maxs = -99999999;
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#else
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mins = 999999;
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maxs = -999999;
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#endif
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for (i = 0; i < f->numpoints; i++)
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{
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v = DotProduct(f->pts[i], tex->vecs[axis]);
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if (v < mins)
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{
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mins = v;
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}
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if (v > maxs)
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{
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maxs = v;
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}
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}
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if ((maxs - mins) <= g_subdivide_size)
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{
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break;
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}
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#endif
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// split it
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subdivides++;
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VectorCopy(tex->vecs[axis], temp);
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v = VectorNormalize(temp);
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VectorCopy(temp, plane.normal);
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#ifdef HLBSP_SUBDIVIDE_INMID
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int splitpos;
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if ((lightmapmaxs - lightmapmins - 1) - (maxlightmapsize - 1) < (maxlightmapsize - 1) / 4) // don't create very thin face
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{
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splitpos = lightmapmins + (maxlightmapsize - 1) - (maxlightmapsize - 1) / 4;
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}
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else
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{
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splitpos = lightmapmins + (maxlightmapsize - 1);
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}
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plane.dist = ((splitpos + 0.5) * TEXTURE_STEP - tex->vecs[axis][3]) / v;
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#else
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plane.dist = (mins + g_subdivide_size - TEXTURE_STEP) / v; //plane.dist = (mins + g_subdivide_size - 16) / v; //--vluzacn
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#endif
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next = f->next;
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SplitFace(f, &plane, &front, &back);
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if (!front || !back)
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{
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Developer(DEVELOPER_LEVEL_SPAM, "SubdivideFace: didn't split the %d-sided polygon @(%.0f,%.0f,%.0f)",
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f->numpoints, f->pts[0][0], f->pts[0][1], f->pts[0][2]);
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#ifndef HLBSP_SubdivideFace_FIX
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break;
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#endif
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}
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#ifdef HLBSP_SubdivideFace_FIX
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f = next;
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if (front)
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{
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front->next = f;
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f = front;
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}
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if (back)
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{
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back->next = f;
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f = back;
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}
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*prevptr = f;
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#else
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*prevptr = back;
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back->next = front;
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front->next = next;
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f = back;
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#endif
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}
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}
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}
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//===========================================================================
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typedef struct hashvert_s
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{
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struct hashvert_s* next;
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vec3_t point;
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int num;
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int numplanes; // for corner determination
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int planenums[2];
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int numedges;
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}
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hashvert_t;
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// #define POINT_EPSILON 0.01
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#define POINT_EPSILON (ON_EPSILON / 2) //#define POINT_EPSILON ON_EPSILON //--vluzacn
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static hashvert_t hvertex[MAX_MAP_VERTS];
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static hashvert_t* hvert_p;
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static face_t* edgefaces[MAX_MAP_EDGES][2];
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static int firstmodeledge = 1;
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static int firstmodelface;
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//============================================================================
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#define NUM_HASH 4096
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static hashvert_t* hashverts[NUM_HASH];
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static vec3_t hash_min;
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static vec3_t hash_scale;
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#ifdef HLBSP_HASH_FIX
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// It's okay if the coordinates go under hash_min, because they are hashed in a cyclic way (modulus by hash_numslots)
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// So please don't change the hardcoded hash_min and scale
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static int hash_numslots[3];
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#define MAX_HASH_NEIGHBORS 4
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#endif
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// =====================================================================================
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// InitHash
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// =====================================================================================
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static void InitHash()
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{
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vec3_t size;
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vec_t volume;
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vec_t scale;
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int newsize[2];
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int i;
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memset(hashverts, 0, sizeof(hashverts));
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for (i = 0; i < 3; i++)
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{
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hash_min[i] = -8000;
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size[i] = 16000;
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}
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volume = size[0] * size[1];
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scale = sqrt(volume / NUM_HASH);
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#ifdef HLBSP_HASH_FIX
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hash_numslots[0] = (int)floor (size[0] / scale);
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hash_numslots[1] = (int)floor (size[1] / scale);
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while (hash_numslots[0] * hash_numslots[1] > NUM_HASH)
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{
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Developer (DEVELOPER_LEVEL_WARNING, "hash_numslots[0] * hash_numslots[1] > NUM_HASH");
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hash_numslots[0]--;
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hash_numslots[1]--;
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}
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hash_scale[0] = hash_numslots[0] / size[0];
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hash_scale[1] = hash_numslots[1] / size[1];
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#else
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newsize[0] = size[0] / scale;
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newsize[1] = size[1] / scale;
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hash_scale[0] = newsize[0] / size[0];
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hash_scale[1] = newsize[1] / size[1];
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hash_scale[2] = newsize[1];
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#endif
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hvert_p = hvertex;
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}
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// =====================================================================================
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// HashVec
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// =====================================================================================
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#ifdef HLBSP_HASH_FIX
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static int HashVec (const vec3_t vec, int *num_hashneighbors, int *hashneighbors)
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// returned value: the one bucket that a new vertex may "write" into
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// returned hashneighbors: the buckets that we should "read" to check for an existing vertex
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{
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int h;
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int i;
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int x;
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int y;
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int slot[2];
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vec_t normalized[2];
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vec_t slotdiff[2];
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for (i = 0; i < 2; i++)
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{
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normalized[i] = hash_scale[i] * (vec[i] - hash_min[i]);
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slot[i] = (int)floor (normalized[i]);
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slotdiff[i] = normalized[i] - (vec_t)slot[i];
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slot[i] = (slot[i] + hash_numslots[i]) % hash_numslots[i];
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slot[i] = (slot[i] + hash_numslots[i]) % hash_numslots[i]; // do it twice to handle negative values
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}
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h = slot[0] * hash_numslots[1] + slot[1];
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*num_hashneighbors = 0;
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for (x = -1; x <= 1; x++)
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{
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if (x == -1 && slotdiff[0] > hash_scale[0] * (2 * POINT_EPSILON) ||
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x == 1 && slotdiff[0] < 1 - hash_scale[0] * (2 * POINT_EPSILON))
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{
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continue;
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}
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for (y = -1; y <= 1; y++)
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{
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if (y == -1 && slotdiff[1] > hash_scale[1] * (2 * POINT_EPSILON) ||
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y == 1 && slotdiff[1] < 1 - hash_scale[1] * (2 * POINT_EPSILON))
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{
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continue;
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}
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if (*num_hashneighbors >= MAX_HASH_NEIGHBORS)
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{
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Error ("HashVec: internal error.");
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}
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hashneighbors[*num_hashneighbors] =
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((slot[0] + x + hash_numslots[0]) % hash_numslots[0]) * hash_numslots[1] +
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(slot[1] + y + hash_numslots[1]) % hash_numslots[1];
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(*num_hashneighbors)++;
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}
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}
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return h;
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}
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#else // This HashVec function was subtly but horribly wrong...
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static unsigned HashVec(const vec3_t vec)
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{
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unsigned h;
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h = hash_scale[0] * (vec[0] - hash_min[0]) * hash_scale[2] + hash_scale[1] * (vec[1] - hash_min[1]);
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if (h >= NUM_HASH)
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{
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return NUM_HASH - 1;
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}
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return h;
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}
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#endif
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// =====================================================================================
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// GetVertex
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// =====================================================================================
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static int GetVertex(const vec3_t in, const int planenum)
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{
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int h;
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int i;
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hashvert_t* hv;
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vec3_t vert;
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#ifdef HLBSP_HASH_FIX
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int num_hashneighbors;
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int hashneighbors[MAX_HASH_NEIGHBORS];
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#endif
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for (i = 0; i < 3; i++)
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{
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if (fabs(in[i] - VectorRound(in[i])) < 0.001)
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{
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vert[i] = VectorRound(in[i]);
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}
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else
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{
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vert[i] = in[i];
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}
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}
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#ifdef HLBSP_HASH_FIX
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h = HashVec(vert, &num_hashneighbors, hashneighbors);
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#else
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h = HashVec(vert);
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#endif
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#ifdef HLBSP_HASH_FIX
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for (i = 0; i < num_hashneighbors; i++)
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for (hv = hashverts[hashneighbors[i]]; hv; hv = hv->next)
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#else
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for (hv = hashverts[h]; hv; hv = hv->next)
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#endif
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{
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if (fabs(hv->point[0] - vert[0]) < POINT_EPSILON
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&& fabs(hv->point[1] - vert[1]) < POINT_EPSILON && fabs(hv->point[2] - vert[2]) < POINT_EPSILON)
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{
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hv->numedges++;
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if (hv->numplanes == 3)
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{
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return hv->num; // allready known to be a corner
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}
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for (i = 0; i < hv->numplanes; i++)
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{
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if (hv->planenums[i] == planenum)
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{
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return hv->num; // allready know this plane
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}
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}
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if (hv->numplanes != 2)
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{
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hv->planenums[hv->numplanes] = planenum;
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}
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hv->numplanes++;
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return hv->num;
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}
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}
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hv = hvert_p;
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hv->numedges = 1;
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hv->numplanes = 1;
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hv->planenums[0] = planenum;
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hv->next = hashverts[h];
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hashverts[h] = hv;
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VectorCopy(vert, hv->point);
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hv->num = g_numvertexes;
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hlassume(hv->num != MAX_MAP_VERTS, assume_MAX_MAP_VERTS);
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hvert_p++;
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// emit a vertex
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hlassume(g_numvertexes < MAX_MAP_VERTS, assume_MAX_MAP_VERTS);
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g_dvertexes[g_numvertexes].point[0] = vert[0];
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g_dvertexes[g_numvertexes].point[1] = vert[1];
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g_dvertexes[g_numvertexes].point[2] = vert[2];
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g_numvertexes++;
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return hv->num;
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}
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//===========================================================================
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// =====================================================================================
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// GetEdge
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// Don't allow four way edges
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// =====================================================================================
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int GetEdge(const vec3_t p1, const vec3_t p2, face_t* f)
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{
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int v1;
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int v2;
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dedge_t* edge;
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int i;
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hlassert(f->contents);
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v1 = GetVertex(p1, f->planenum);
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v2 = GetVertex(p2, f->planenum);
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for (i = firstmodeledge; i < g_numedges; i++)
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{
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edge = &g_dedges[i];
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if (v1 == edge->v[1] && v2 == edge->v[0] && !edgefaces[i][1] && edgefaces[i][0]->contents == f->contents
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#ifdef HLBSP_EDGESHARE_SAMESIDE
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&& edgefaces[i][0]->planenum != (f->planenum ^ 1)
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&& edgefaces[i][0]->contents == f->contents
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#endif
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)
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{
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edgefaces[i][1] = f;
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return -i;
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}
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}
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// emit an edge
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hlassume(g_numedges < MAX_MAP_EDGES, assume_MAX_MAP_EDGES);
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edge = &g_dedges[g_numedges];
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g_numedges++;
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edge->v[0] = v1;
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edge->v[1] = v2;
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edgefaces[i][0] = f;
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return i;
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}
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// =====================================================================================
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// MakeFaceEdges
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// =====================================================================================
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void MakeFaceEdges()
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{
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InitHash();
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firstmodeledge = g_numedges;
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firstmodelface = g_numfaces;
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}
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