384 lines
9.7 KiB
C
384 lines
9.7 KiB
C
/********************************************************************/
|
|
/* STRIPE: converting a polygonal model to triangle strips
|
|
Francine Evans, 1996.
|
|
SUNY @ Stony Brook
|
|
Advisors: Steven Skiena and Amitabh Varshney
|
|
*/
|
|
/********************************************************************/
|
|
|
|
/*---------------------------------------------------------------------*/
|
|
/* STRIPE: add.c
|
|
This file contains the procedure code that will add information
|
|
to our data structures.
|
|
*/
|
|
/*---------------------------------------------------------------------*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include <string.h>
|
|
#include "global.h"
|
|
#include "queue.h"
|
|
#include "polverts.h"
|
|
#include "triangulate.h"
|
|
#include "ties.h"
|
|
#include "outputex.h"
|
|
#include "options.h"
|
|
#include "local.h"
|
|
|
|
BOOL new_vertex(double difference, int id1,int id2,
|
|
struct vert_struct *n)
|
|
{
|
|
/* Is the difference between id1 and id2 (2 normal vertices that
|
|
mapped to the same vertex) greater than the
|
|
threshold that was specified?
|
|
*/
|
|
struct vert_struct *pn1,*pn2;
|
|
double dot_product;
|
|
double distance1, distance2,distance;
|
|
double rad;
|
|
char arg1[100];
|
|
char arg2[100];
|
|
|
|
pn1 = n + id1;
|
|
pn2 = n + id2;
|
|
|
|
dot_product = ((pn1->x) * (pn2->x)) +
|
|
((pn1->y) * (pn2->y)) +
|
|
((pn1->z) * (pn2->z));
|
|
/* Get the absolute value */
|
|
if (dot_product < 0)
|
|
dot_product = dot_product * -1;
|
|
|
|
distance1 = sqrt( (pn1->x * pn1->x) +
|
|
(pn1->y * pn1->y) +
|
|
(pn1->z * pn1->z) );
|
|
distance2 = sqrt( (pn2->x * pn2->x) +
|
|
(pn2->y * pn2->y) +
|
|
(pn2->z * pn2->z) );
|
|
distance = distance1 * distance2;
|
|
|
|
rad = acos((double)dot_product/(double)distance);
|
|
/* convert to degrees */
|
|
rad = (180 * rad)/PI;
|
|
|
|
if ( rad <= difference)
|
|
return FALSE;
|
|
|
|
/* double checking because of imprecision with floating
|
|
point acos function
|
|
*/
|
|
sprintf( arg1,"%.5f", rad );
|
|
sprintf( arg2,"%.5f", difference );
|
|
if ( strcmp( arg1, arg2 ) <=0 )
|
|
return( FALSE );
|
|
if ( rad <= difference)
|
|
return FALSE;
|
|
else
|
|
return TRUE;
|
|
}
|
|
|
|
BOOL Check_VN(int vertex,int normal, struct vert_added *added)
|
|
{
|
|
/* Check to see if we already added this vertex and normal */
|
|
register int x,n;
|
|
|
|
n = (added+vertex)->num;
|
|
for (x = 0; x < n; x++)
|
|
{
|
|
if (*((added+vertex)->normal+x) == normal)
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
BOOL norm_array(int id, int vertex, double normal_difference,
|
|
struct vert_struct *n, int num_vert)
|
|
{
|
|
static int last;
|
|
static struct vert_added *added;
|
|
register int x;
|
|
static BOOL first = TRUE;
|
|
|
|
if (first)
|
|
{
|
|
/* This is the first time that we are in here, so we will allocate
|
|
a structure that will save the vertices that we added, so that we
|
|
do not add the same thing twice
|
|
*/
|
|
first = FALSE;
|
|
added = (struct vert_added *) malloc (sizeof (struct vert_added ) * num_vert);
|
|
/* The number of vertices added for each vertex must be initialized to
|
|
zero
|
|
*/
|
|
for (x = 0; x < num_vert; x++)
|
|
(added+x)->num = 0;
|
|
}
|
|
|
|
if (vertex)
|
|
/* Set the pointer to the vertex, we will be calling again with the
|
|
normal to fill it with
|
|
*/
|
|
last = id;
|
|
else
|
|
{
|
|
/* Fill the pointer with the id of the normal */
|
|
if (*(vert_norms + last) == 0)
|
|
*(vert_norms + last) = id;
|
|
else if ((*(vert_norms + last) != id) && ((int)normal_difference != 360))
|
|
{
|
|
/* difference is big enough, we need to create a new vertex */
|
|
if (new_vertex(normal_difference,id,*(vert_norms + last),n))
|
|
{
|
|
/* First check to see if we added this vertex and normal already */
|
|
if (Check_VN(last,id,added))
|
|
return FALSE;
|
|
/* OK, create the new vertex, and have its id = the number of vertices
|
|
and its normal what we have here
|
|
*/
|
|
vert_norms = realloc(vert_norms, sizeof(int) * (num_vert + 1));
|
|
if (!vert_norms)
|
|
{
|
|
printf("Allocation error - aborting\n");
|
|
exit(1);
|
|
}
|
|
*(vert_norms + num_vert) = id;
|
|
/* We created a new vertex, now put it in our added structure so
|
|
we do not add the same thing twice
|
|
*/
|
|
(added+last)->num = (added+last)->num + 1;
|
|
if ((added+last)->num == 1)
|
|
{
|
|
/* First time */
|
|
(added+last)->normal = (int *) malloc (sizeof (int ) * 1);
|
|
*((added+last)->normal) = id;
|
|
}
|
|
else
|
|
{
|
|
/* Not the first time, reallocate space */
|
|
(added+last)->normal = realloc((added+last)->normal,sizeof(int) * (added+last)->num);
|
|
*((added+last)->normal+((added+last)->num-1)) = id;
|
|
}
|
|
return TRUE;
|
|
}
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
void add_texture(int id,BOOL vertex)
|
|
{
|
|
/* Save the texture with its vertex for future use when outputting */
|
|
static int last;
|
|
|
|
if (vertex)
|
|
last = id;
|
|
else
|
|
*(vert_texture+last) = id;
|
|
}
|
|
|
|
int add_vert_id(int id, int index_count)
|
|
{
|
|
register int x;
|
|
|
|
/* Test if degenerate, if so do not add degenerate vertex */
|
|
for (x = 1; x < index_count ; x++)
|
|
{
|
|
if (ids[x] == id)
|
|
return 0;
|
|
}
|
|
ids[index_count] = id;
|
|
return 1;
|
|
}
|
|
|
|
void add_norm_id(int id, int index_count)
|
|
{
|
|
norms[index_count] = id;
|
|
}
|
|
|
|
void AddNewFace(int ids[STRIP_MAX], int vert_count, int face_id,
|
|
int norms[STRIP_MAX])
|
|
{
|
|
PF_FACES pfNode;
|
|
int *pTempInt;
|
|
int *pnorms;
|
|
F_EDGES **pTempVertptr;
|
|
int *pTempmarked, *pTempwalked;
|
|
register int y,count = 0;
|
|
|
|
/* Add a new face into our face data structure */
|
|
|
|
pfNode = (PF_FACES) malloc(sizeof(F_FACES) );
|
|
if ( pfNode )
|
|
{
|
|
pfNode->pPolygon = (int*) malloc(sizeof(int) * (vert_count) );
|
|
pfNode->pNorms = (int*) malloc(sizeof(int) * (vert_count) );
|
|
pfNode->VertandId = (F_EDGES**)malloc(sizeof(F_EDGES*) * (vert_count));
|
|
pfNode->marked = (int*)malloc(sizeof(int) * (vert_count));
|
|
pfNode->walked = (int*)malloc(sizeof(int) * (vert_count));
|
|
}
|
|
pTempInt =pfNode->pPolygon;
|
|
pnorms = pfNode->pNorms;
|
|
pTempmarked = pfNode->marked;
|
|
pTempwalked = pfNode->walked;
|
|
pTempVertptr = pfNode->VertandId;
|
|
pfNode->nPolSize = vert_count;
|
|
pfNode->seen = -1;
|
|
pfNode->seen2 = -1;
|
|
for (y=1;y<=vert_count;y++)
|
|
{
|
|
*(pTempInt + count) = ids[y];
|
|
*(pnorms + count) = norms[y];
|
|
*(pTempmarked + count) = FALSE;
|
|
*(pTempwalked + count) = -1;
|
|
*(pTempVertptr+count) = NULL;
|
|
count++;
|
|
}
|
|
AddHead(PolFaces[face_id-1],(PLISTINFO) pfNode);
|
|
}
|
|
|
|
|
|
void CopyFace(int ids[STRIP_MAX], int vert_count, int face_id,
|
|
int norms[STRIP_MAX])
|
|
{
|
|
PF_FACES pfNode;
|
|
int *pTempInt;
|
|
int *pnorms;
|
|
F_EDGES **pTempVertptr;
|
|
int *pTempmarked, *pTempwalked;
|
|
register int y,count = 0;
|
|
|
|
/* Copy a face node into a new node, used after the global algorithm
|
|
is run, so that we can save whatever is left into a new structure
|
|
*/
|
|
|
|
pfNode = (PF_FACES) malloc(sizeof(F_FACES) );
|
|
if ( pfNode )
|
|
{
|
|
pfNode->pPolygon = (int*) malloc(sizeof(int) * (vert_count) );
|
|
pfNode->pNorms = (int*) malloc(sizeof(int) * (vert_count) );
|
|
pfNode->VertandId = (F_EDGES**)malloc(sizeof(F_EDGES*) * (vert_count));
|
|
pfNode->marked = (int*)malloc(sizeof(int) * (vert_count));
|
|
pfNode->walked = (int*)malloc(sizeof(int) * (vert_count));
|
|
}
|
|
pTempInt =pfNode->pPolygon;
|
|
pnorms = pfNode->pNorms;
|
|
pTempmarked = pfNode->marked;
|
|
pTempwalked = pfNode->walked;
|
|
pTempVertptr = pfNode->VertandId;
|
|
pfNode->nPolSize = vert_count;
|
|
pfNode->seen = -1;
|
|
pfNode->seen2 = -1;
|
|
for (y=0;y<vert_count;y++)
|
|
{
|
|
*(pTempInt + count) = ids[y];
|
|
*(pnorms + count) = norms[y];
|
|
*(pTempmarked + count) = FALSE;
|
|
*(pTempwalked + count) = -1;
|
|
*(pTempVertptr+count) = NULL;
|
|
count++;
|
|
}
|
|
AddHead(PolFaces[face_id-1],(PLISTINFO) pfNode);
|
|
}
|
|
|
|
void Add_Edge(int v1,int v2)
|
|
{
|
|
PF_EDGES temp = NULL;
|
|
ListHead *pListHead;
|
|
BOOL flag = TRUE;
|
|
register int t,count = 0;
|
|
|
|
/* Add a new edge into the edge data structure */
|
|
if (v1 > v2)
|
|
{
|
|
t = v1;
|
|
v1 = v2;
|
|
v2 = t;
|
|
}
|
|
|
|
pListHead = PolEdges[v1];
|
|
temp = (PF_EDGES) PeekList(pListHead,LISTHEAD,count);
|
|
if (temp == NULL)
|
|
{
|
|
printf("Have the wrong edge \n:");
|
|
exit(1);
|
|
}
|
|
|
|
while (flag)
|
|
{
|
|
if (v2 == temp->edge[0])
|
|
return;
|
|
else
|
|
temp = (PF_EDGES) PeekList(pListHead,LISTHEAD,++count);
|
|
}
|
|
}
|
|
|
|
void Add_AdjEdge(int v1,int v2,int fnum,int index1 )
|
|
{
|
|
PF_EDGES temp = NULL;
|
|
PF_FACES temp2 = NULL;
|
|
PF_EDGES pfNode;
|
|
ListHead *pListHead;
|
|
ListHead *pListFace;
|
|
BOOL flag = TRUE;
|
|
register int count = 0;
|
|
register int t,v3 = -1;
|
|
|
|
if (v1 > v2)
|
|
{
|
|
t = v1;
|
|
v1 = v2;
|
|
v2 = t;
|
|
}
|
|
pListFace = PolFaces[fnum];
|
|
temp2 = (PF_FACES) PeekList(pListFace,LISTHEAD,0);
|
|
pListHead = PolEdges[v1];
|
|
temp = (PF_EDGES) PeekList(pListHead,LISTHEAD,count);
|
|
if (temp == NULL)
|
|
flag = FALSE;
|
|
count++;
|
|
while (flag)
|
|
{
|
|
if (v2 == temp->edge[0])
|
|
{
|
|
/* If greater than 2 polygons adjacent to an edge, then we will
|
|
only save the first 2 that we found. We will have a small performance
|
|
hit, but this does not happen often.
|
|
*/
|
|
if (temp->edge[2] == -1)
|
|
temp->edge[2] = fnum;
|
|
else
|
|
v3 = temp->edge[2];
|
|
flag = FALSE;
|
|
}
|
|
else
|
|
{
|
|
temp = (PF_EDGES) PeekList(pListHead,LISTHEAD,count);
|
|
count++;
|
|
if (temp == NULL)
|
|
flag = FALSE;
|
|
}
|
|
}
|
|
|
|
/* Did not find it */
|
|
if (temp == NULL)
|
|
{
|
|
pfNode = (PF_EDGES) malloc(sizeof(F_EDGES) );
|
|
if ( pfNode )
|
|
{
|
|
pfNode->edge[0] = v2;
|
|
pfNode->edge[1] = fnum;
|
|
pfNode->edge[2] = v3;
|
|
AddTail( PolEdges[v1], (PLISTINFO) pfNode );
|
|
}
|
|
else
|
|
{
|
|
printf("Out of memory!\n");
|
|
exit(1);
|
|
}
|
|
|
|
*(temp2->VertandId+index1) = pfNode;
|
|
}
|
|
else
|
|
*(temp2->VertandId+index1) = temp;
|
|
}
|