ioq3quest/q3map/mesh.c

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
2005-08-26 17:39:27 +00:00
#include "qbsp.h"
/*
===============================================================
MESH SUBDIVISION
===============================================================
*/
int originalWidths[MAX_EXPANDED_AXIS];
int originalHeights[MAX_EXPANDED_AXIS];
int neighbors[8][2] = {
{0,1}, {1,1}, {1,0}, {1,-1}, {0,-1}, {-1,-1}, {-1,0}, {-1,1}
};
/*
============
LerpDrawVert
============
*/
void LerpDrawVert( drawVert_t *a, drawVert_t *b, drawVert_t *out ) {
out->xyz[0] = 0.5 * (a->xyz[0] + b->xyz[0]);
out->xyz[1] = 0.5 * (a->xyz[1] + b->xyz[1]);
out->xyz[2] = 0.5 * (a->xyz[2] + b->xyz[2]);
out->st[0] = 0.5 * (a->st[0] + b->st[0]);
out->st[1] = 0.5 * (a->st[1] + b->st[1]);
out->lightmap[0] = 0.5 * (a->lightmap[0] + b->lightmap[0]);
out->lightmap[1] = 0.5 * (a->lightmap[1] + b->lightmap[1]);
out->color[0] = (a->color[0] + b->color[0]) >> 1;
out->color[1] = (a->color[1] + b->color[1]) >> 1;
out->color[2] = (a->color[2] + b->color[2]) >> 1;
out->color[3] = (a->color[3] + b->color[3]) >> 1;
}
void FreeMesh( mesh_t *m ) {
free( m->verts );
free( m );
}
void PrintMesh( mesh_t *m ) {
int i, j;
for ( i = 0 ; i < m->height ; i++ ) {
for ( j = 0 ; j < m->width ; j++ ) {
_printf("(%5.2f %5.2f %5.2f) "
, m->verts[i*m->width+j].xyz[0]
, m->verts[i*m->width+j].xyz[1]
, m->verts[i*m->width+j].xyz[2] );
}
_printf("\n");
}
}
mesh_t *CopyMesh( mesh_t *mesh ) {
mesh_t *out;
int size;
out = malloc( sizeof( *out ) );
out->width = mesh->width;
out->height = mesh->height;
size = out->width * out->height * sizeof( *out->verts );
out->verts = malloc( size );
memcpy( out->verts, mesh->verts, size );
return out;
}
/*
=================
TransposeMesh
Returns a transposed copy of the mesh, freeing the original
=================
*/
mesh_t *TransposeMesh( mesh_t *in ) {
int w, h;
mesh_t *out;
out = malloc( sizeof( *out ) );
out->width = in->height;
out->height = in->width;
out->verts = malloc( out->width * out->height * sizeof( drawVert_t ) );
for ( h = 0 ; h < in->height ; h++ ) {
for ( w = 0 ; w < in->width ; w++ ) {
out->verts[ w * in->height + h ] = in->verts[ h * in->width + w ];
}
}
FreeMesh( in );
return out;
}
void InvertMesh( mesh_t *in ) {
int w, h;
drawVert_t temp;
for ( h = 0 ; h < in->height ; h++ ) {
for ( w = 0 ; w < in->width / 2 ; w++ ) {
temp = in->verts[ h * in->width + w ];
in->verts[ h * in->width + w ] = in->verts[ h * in->width + in->width - 1 - w ];
in->verts[ h * in->width + in->width - 1 - w ] = temp;
}
}
}
/*
=================
MakeMeshNormals
=================
*/
void MakeMeshNormals( mesh_t in ) {
int i, j, k, dist;
vec3_t normal;
vec3_t sum;
int count;
vec3_t base;
vec3_t delta;
int x, y;
drawVert_t *dv;
vec3_t around[8], temp;
qboolean good[8];
qboolean wrapWidth, wrapHeight;
float len;
wrapWidth = qfalse;
for ( i = 0 ; i < in.height ; i++ ) {
VectorSubtract( in.verts[i*in.width].xyz,
in.verts[i*in.width+in.width-1].xyz, delta );
len = VectorLength( delta );
if ( len > 1.0 ) {
break;
}
}
if ( i == in.height ) {
wrapWidth = qtrue;
}
wrapHeight = qfalse;
for ( i = 0 ; i < in.width ; i++ ) {
VectorSubtract( in.verts[i].xyz,
in.verts[i + (in.height-1)*in.width].xyz, delta );
len = VectorLength( delta );
if ( len > 1.0 ) {
break;
}
}
if ( i == in.width) {
wrapHeight = qtrue;
}
for ( i = 0 ; i < in.width ; i++ ) {
for ( j = 0 ; j < in.height ; j++ ) {
count = 0;
dv = &in.verts[j*in.width+i];
VectorCopy( dv->xyz, base );
for ( k = 0 ; k < 8 ; k++ ) {
VectorClear( around[k] );
good[k] = qfalse;
for ( dist = 1 ; dist <= 3 ; dist++ ) {
x = i + neighbors[k][0] * dist;
y = j + neighbors[k][1] * dist;
if ( wrapWidth ) {
if ( x < 0 ) {
x = in.width - 1 + x;
} else if ( x >= in.width ) {
x = 1 + x - in.width;
}
}
if ( wrapHeight ) {
if ( y < 0 ) {
y = in.height - 1 + y;
} else if ( y >= in.height ) {
y = 1 + y - in.height;
}
}
if ( x < 0 || x >= in.width || y < 0 || y >= in.height ) {
break; // edge of patch
}
VectorSubtract( in.verts[y*in.width+x].xyz, base, temp );
if ( VectorNormalize( temp, temp ) == 0 ) {
continue; // degenerate edge, get more dist
} else {
good[k] = qtrue;
VectorCopy( temp, around[k] );
break; // good edge
}
}
}
VectorClear( sum );
for ( k = 0 ; k < 8 ; k++ ) {
if ( !good[k] || !good[(k+1)&7] ) {
continue; // didn't get two points
}
CrossProduct( around[(k+1)&7], around[k], normal );
if ( VectorNormalize( normal, normal ) == 0 ) {
continue;
}
VectorAdd( normal, sum, sum );
count++;
}
if ( count == 0 ) {
//_printf("bad normal\n");
count = 1;
}
VectorNormalize( sum, dv->normal );
}
}
}
/*
=================
PutMeshOnCurve
Drops the aproximating points onto the curve
=================
*/
void PutMeshOnCurve( mesh_t in ) {
int i, j, l;
float prev, next;
// put all the aproximating points on the curve
for ( i = 0 ; i < in.width ; i++ ) {
for ( j = 1 ; j < in.height ; j += 2 ) {
for ( l = 0 ; l < 3 ; l++ ) {
prev = ( in.verts[j*in.width+i].xyz[l] + in.verts[(j+1)*in.width+i].xyz[l] ) * 0.5;
next = ( in.verts[j*in.width+i].xyz[l] + in.verts[(j-1)*in.width+i].xyz[l] ) * 0.5;
in.verts[j*in.width+i].xyz[l] = ( prev + next ) * 0.5;
}
}
}
for ( j = 0 ; j < in.height ; j++ ) {
for ( i = 1 ; i < in.width ; i += 2 ) {
for ( l = 0 ; l < 3 ; l++ ) {
prev = ( in.verts[j*in.width+i].xyz[l] + in.verts[j*in.width+i+1].xyz[l] ) * 0.5;
next = ( in.verts[j*in.width+i].xyz[l] + in.verts[j*in.width+i-1].xyz[l] ) * 0.5;
in.verts[j*in.width+i].xyz[l] = ( prev + next ) * 0.5;
}
}
}
}
/*
=================
SubdivideMesh
=================
*/
mesh_t *SubdivideMesh( mesh_t in, float maxError, float minLength ) {
int i, j, k, l;
drawVert_t prev, next, mid;
vec3_t prevxyz, nextxyz, midxyz;
vec3_t delta;
float len;
mesh_t out;
drawVert_t expand[MAX_EXPANDED_AXIS][MAX_EXPANDED_AXIS];
out.width = in.width;
out.height = in.height;
for ( i = 0 ; i < in.width ; i++ ) {
for ( j = 0 ; j < in.height ; j++ ) {
expand[j][i] = in.verts[j*in.width+i];
}
}
for ( i = 0 ; i < in.height ; i++ ) {
originalHeights[i] = i;
}
for ( i = 0 ; i < in.width ; i++ ) {
originalWidths[i] = i;
}
// horizontal subdivisions
for ( j = 0 ; j + 2 < out.width ; j += 2 ) {
// check subdivided midpoints against control points
for ( i = 0 ; i < out.height ; i++ ) {
for ( l = 0 ; l < 3 ; l++ ) {
prevxyz[l] = expand[i][j+1].xyz[l] - expand[i][j].xyz[l];
nextxyz[l] = expand[i][j+2].xyz[l] - expand[i][j+1].xyz[l];
midxyz[l] = (expand[i][j].xyz[l] + expand[i][j+1].xyz[l] * 2
+ expand[i][j+2].xyz[l] ) * 0.25;
}
// if the span length is too long, force a subdivision
if ( VectorLength( prevxyz ) > minLength
|| VectorLength( nextxyz ) > minLength ) {
break;
}
// see if this midpoint is off far enough to subdivide
VectorSubtract( expand[i][j+1].xyz, midxyz, delta );
len = VectorLength( delta );
if ( len > maxError ) {
break;
}
}
if ( out.width + 2 >= MAX_EXPANDED_AXIS ) {
break; // can't subdivide any more
}
if ( i == out.height ) {
continue; // didn't need subdivision
}
// insert two columns and replace the peak
out.width += 2;
for ( k = out.width - 1 ; k > j + 3 ; k-- ) {
originalWidths[k] = originalWidths[k-2];
}
originalWidths[j+3] = originalWidths[j+1];
originalWidths[j+2] = originalWidths[j+1];
originalWidths[j+1] = originalWidths[j];
for ( i = 0 ; i < out.height ; i++ ) {
LerpDrawVert( &expand[i][j], &expand[i][j+1], &prev );
LerpDrawVert( &expand[i][j+1], &expand[i][j+2], &next );
LerpDrawVert( &prev, &next, &mid );
for ( k = out.width - 1 ; k > j + 3 ; k-- ) {
expand[i][k] = expand[i][k-2];
}
expand[i][j + 1] = prev;
expand[i][j + 2] = mid;
expand[i][j + 3] = next;
}
// back up and recheck this set again, it may need more subdivision
j -= 2;
}
// vertical subdivisions
for ( j = 0 ; j + 2 < out.height ; j += 2 ) {
// check subdivided midpoints against control points
for ( i = 0 ; i < out.width ; i++ ) {
for ( l = 0 ; l < 3 ; l++ ) {
prevxyz[l] = expand[j+1][i].xyz[l] - expand[j][i].xyz[l];
nextxyz[l] = expand[j+2][i].xyz[l] - expand[j+1][i].xyz[l];
midxyz[l] = (expand[j][i].xyz[l] + expand[j+1][i].xyz[l] * 2
+ expand[j+2][i].xyz[l] ) * 0.25;
}
// if the span length is too long, force a subdivision
if ( VectorLength( prevxyz ) > minLength
|| VectorLength( nextxyz ) > minLength ) {
break;
}
// see if this midpoint is off far enough to subdivide
VectorSubtract( expand[j+1][i].xyz, midxyz, delta );
len = VectorLength( delta );
if ( len > maxError ) {
break;
}
}
if ( out.height + 2 >= MAX_EXPANDED_AXIS ) {
break; // can't subdivide any more
}
if ( i == out.width ) {
continue; // didn't need subdivision
}
// insert two columns and replace the peak
out.height += 2;
for ( k = out.height - 1 ; k > j + 3 ; k-- ) {
originalHeights[k] = originalHeights[k-2];
}
originalHeights[j+3] = originalHeights[j+1];
originalHeights[j+2] = originalHeights[j+1];
originalHeights[j+1] = originalHeights[j];
for ( i = 0 ; i < out.width ; i++ ) {
LerpDrawVert( &expand[j][i], &expand[j+1][i], &prev );
LerpDrawVert( &expand[j+1][i], &expand[j+2][i], &next );
LerpDrawVert( &prev, &next, &mid );
for ( k = out.height - 1 ; k > j + 3 ; k-- ) {
expand[k][i] = expand[k-2][i];
}
expand[j+1][i] = prev;
expand[j+2][i] = mid;
expand[j+3][i] = next;
}
// back up and recheck this set again, it may need more subdivision
j -= 2;
}
// collapse the verts
out.verts = &expand[0][0];
for ( i = 1 ; i < out.height ; i++ ) {
memmove( &out.verts[i*out.width], expand[i], out.width * sizeof(drawVert_t) );
}
return CopyMesh(&out);
}
/*
================
ProjectPointOntoVector
================
*/
void ProjectPointOntoVector( vec3_t point, vec3_t vStart, vec3_t vEnd, vec3_t vProj )
{
vec3_t pVec, vec;
VectorSubtract( point, vStart, pVec );
VectorSubtract( vEnd, vStart, vec );
VectorNormalize( vec, vec );
// project onto the directional vector for this segment
VectorMA( vStart, DotProduct( pVec, vec ), vec, vProj );
}
/*
================
RemoveLinearMeshColumsRows
================
*/
mesh_t *RemoveLinearMeshColumnsRows( mesh_t *in ) {
int i, j, k;
float len, maxLength;
vec3_t proj, dir;
mesh_t out;
drawVert_t expand[MAX_EXPANDED_AXIS][MAX_EXPANDED_AXIS];
out.width = in->width;
out.height = in->height;
for ( i = 0 ; i < in->width ; i++ ) {
for ( j = 0 ; j < in->height ; j++ ) {
expand[j][i] = in->verts[j*in->width+i];
}
}
for ( j = 1 ; j < out.width - 1; j++ ) {
maxLength = 0;
for ( i = 0 ; i < out.height ; i++ ) {
ProjectPointOntoVector(expand[i][j].xyz, expand[i][j-1].xyz, expand[i][j+1].xyz, proj);
VectorSubtract(expand[i][j].xyz, proj, dir);
len = VectorLength(dir);
if (len > maxLength) {
maxLength = len;
}
}
if (maxLength < 0.1)
{
out.width--;
for ( i = 0 ; i < out.height ; i++ ) {
for (k = j; k < out.width; k++) {
expand[i][k] = expand[i][k+1];
}
}
for (k = j; k < out.width; k++) {
originalWidths[k] = originalWidths[k+1];
}
j--;
}
}
for ( j = 1 ; j < out.height - 1; j++ ) {
maxLength = 0;
for ( i = 0 ; i < out.width ; i++ ) {
ProjectPointOntoVector(expand[j][i].xyz, expand[j-1][i].xyz, expand[j+1][i].xyz, proj);
VectorSubtract(expand[j][i].xyz, proj, dir);
len = VectorLength(dir);
if (len > maxLength) {
maxLength = len;
}
}
if (maxLength < 0.1)
{
out.height--;
for ( i = 0 ; i < out.width ; i++ ) {
for (k = j; k < out.height; k++) {
expand[k][i] = expand[k+1][i];
}
}
for (k = j; k < out.height; k++) {
originalHeights[k] = originalHeights[k+1];
}
j--;
}
}
// collapse the verts
out.verts = &expand[0][0];
for ( i = 1 ; i < out.height ; i++ ) {
memmove( &out.verts[i*out.width], expand[i], out.width * sizeof(drawVert_t) );
}
return CopyMesh(&out);
}
/*
============
LerpDrawVertAmount
============
*/
void LerpDrawVertAmount( drawVert_t *a, drawVert_t *b, float amount, drawVert_t *out ) {
out->xyz[0] = a->xyz[0] + amount * (b->xyz[0] - a->xyz[0]);
out->xyz[1] = a->xyz[1] + amount * (b->xyz[1] - a->xyz[1]);
out->xyz[2] = a->xyz[2] + amount * (b->xyz[2] - a->xyz[2]);
out->st[0] = a->st[0] + amount * (b->st[0] - a->st[0]);
out->st[1] = a->st[1] + amount * (b->st[1] - a->st[1]);
out->lightmap[0] = a->lightmap[0] + amount * (b->lightmap[0] - a->lightmap[0]);
out->lightmap[1] = a->lightmap[1] + amount * (b->lightmap[1] - a->lightmap[1]);
out->color[0] = a->color[0] + amount * (b->color[0] - a->color[0]);
out->color[1] = a->color[1] + amount * (b->color[1] - a->color[1]);
out->color[2] = a->color[2] + amount * (b->color[2] - a->color[2]);
out->color[3] = a->color[3] + amount * (b->color[3] - a->color[3]);
out->normal[0] = a->normal[0] + amount * (b->normal[0] - a->normal[0]);
out->normal[1] = a->normal[1] + amount * (b->normal[1] - a->normal[1]);
out->normal[2] = a->normal[2] + amount * (b->normal[2] - a->normal[2]);
VectorNormalize(out->normal, out->normal);
}
/*
=================
SubdivideMeshQuads
=================
*/
mesh_t *SubdivideMeshQuads( mesh_t *in, float minLength, int maxsize, int widthtable[], int heighttable[]) {
int i, j, k, w, h, maxsubdivisions, subdivisions;
vec3_t dir;
float length, maxLength, amount;
mesh_t out;
drawVert_t expand[MAX_EXPANDED_AXIS][MAX_EXPANDED_AXIS];
out.width = in->width;
out.height = in->height;
for ( i = 0 ; i < in->width ; i++ ) {
for ( j = 0 ; j < in->height ; j++ ) {
expand[j][i] = in->verts[j*in->width+i];
}
}
if (maxsize > MAX_EXPANDED_AXIS)
Error("SubdivideMeshQuads: maxsize > MAX_EXPANDED_AXIS");
// horizontal subdivisions
maxsubdivisions = (maxsize - in->width) / (in->width - 1);
for ( w = 0, j = 0 ; w < in->width - 1; w++, j += subdivisions + 1) {
maxLength = 0;
for ( i = 0 ; i < out.height ; i++ ) {
VectorSubtract(expand[i][j+1].xyz, expand[i][j].xyz, dir);
length = VectorLength( dir );
if (length > maxLength) {
maxLength = length;
}
}
subdivisions = (int) (maxLength / minLength);
if (subdivisions > maxsubdivisions)
subdivisions = maxsubdivisions;
widthtable[w] = subdivisions + 1;
if (subdivisions <= 0)
continue;
out.width += subdivisions;
for ( k = out.width - 1; k >= j + subdivisions; k-- ) {
originalWidths[k] = originalWidths[k-subdivisions];
}
for (k = 1; k <= subdivisions; k++) {
originalWidths[j+k] = originalWidths[j];
}
for ( i = 0 ; i < out.height ; i++ ) {
for ( k = out.width - 1 ; k > j + subdivisions; k-- ) {
expand[i][k] = expand[i][k-subdivisions];
}
for (k = 1; k <= subdivisions; k++)
{
amount = (float) k / (subdivisions + 1);
LerpDrawVertAmount(&expand[i][j], &expand[i][j+subdivisions+1], amount, &expand[i][j+k]);
}
}
}
maxsubdivisions = (maxsize - in->height) / (in->height - 1);
for ( h = 0, j = 0 ; h < in->height - 1; h++, j += subdivisions + 1) {
maxLength = 0;
for ( i = 0 ; i < out.width ; i++ ) {
VectorSubtract(expand[j+1][i].xyz, expand[j][i].xyz, dir);
length = VectorLength( dir );
if (length > maxLength) {
maxLength = length;
}
}
subdivisions = (int) (maxLength / minLength);
if (subdivisions > maxsubdivisions)
subdivisions = maxsubdivisions;
heighttable[h] = subdivisions + 1;
if (subdivisions <= 0)
continue;
out.height += subdivisions;
for ( k = out.height - 1; k >= j + subdivisions; k-- ) {
originalHeights[k] = originalHeights[k-subdivisions];
}
for (k = 1; k <= subdivisions; k++) {
originalHeights[j+k] = originalHeights[j];
}
for ( i = 0 ; i < out.width ; i++ ) {
for ( k = out.height - 1 ; k > j + subdivisions; k-- ) {
expand[k][i] = expand[k-subdivisions][i];
}
for (k = 1; k <= subdivisions; k++)
{
amount = (float) k / (subdivisions + 1);
LerpDrawVertAmount(&expand[j][i], &expand[j+subdivisions+1][i], amount, &expand[j+k][i]);
}
}
}
// collapse the verts
out.verts = &expand[0][0];
for ( i = 1 ; i < out.height ; i++ ) {
memmove( &out.verts[i*out.width], expand[i], out.width * sizeof(drawVert_t) );
}
return CopyMesh(&out);
}