1 /* -------------------------------------------------------------------------------
3 Copyright (C) 1999-2007 id Software, Inc. and contributors.
4 For a list of contributors, see the accompanying CONTRIBUTORS file.
6 This file is part of GtkRadiant.
8 GtkRadiant is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 GtkRadiant is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GtkRadiant; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 ----------------------------------------------------------------------------------
24 This code has been altered significantly from its original form, to support
25 several games based on the Quake III Arena engine, in the form of "Q3Map2."
27 ------------------------------------------------------------------------------- */
42 ExpandLongestCurve() - ydnar
43 finds length of quadratic curve specified and determines if length is longer than the supplied max
46 #define APPROX_SUBDIVISION 8
48 static void ExpandLongestCurve( float *longestCurve, vec3_t a, vec3_t b, vec3_t c )
52 vec3_t ab, bc, ac, pt, last, delta;
56 VectorSubtract( b, a, ab );
57 if( VectorNormalize( ab, ab ) < 0.125f )
59 VectorSubtract( c, b, bc );
60 if( VectorNormalize( bc, bc ) < 0.125f )
62 VectorSubtract( c, a, ac );
63 if( VectorNormalize( ac, ac ) < 0.125f )
66 /* if all 3 vectors are the same direction, then this edge is linear, so we ignore it */
67 if( DotProduct( ab, bc ) > 0.99f && DotProduct( ab, ac ) > 0.99f )
70 /* recalculate vectors */
71 VectorSubtract( b, a, ab );
72 VectorSubtract( c, b, bc );
74 /* determine length */
75 VectorCopy( a, last );
76 for( i = 0, len = 0.0f, t = 0.0f; i < APPROX_SUBDIVISION; i++, t += (1.0f / APPROX_SUBDIVISION) )
79 delta[ 0 ] = ((1.0f - t) * ab[ 0 ]) + (t * bc[ 0 ]);
80 delta[ 1 ] = ((1.0f - t) * ab[ 1 ]) + (t * bc[ 1 ]);
81 delta[ 2 ] = ((1.0f - t) * ab[ 2 ]) + (t * bc[ 2 ]);
83 /* add to first point and calculate pt-pt delta */
84 VectorAdd( a, delta, pt );
85 VectorSubtract( pt, last, delta );
87 /* add it to length and store last point */
88 len += VectorLength( delta );
89 VectorCopy( pt, last );
93 if( len > *longestCurve )
100 ExpandMaxIterations() - ydnar
101 determines how many iterations a quadratic curve needs to be subdivided with to fit the specified error
104 static void ExpandMaxIterations( int *maxIterations, int maxError, vec3_t a, vec3_t b, vec3_t c )
107 vec3_t prev, next, mid, delta, delta2;
109 int numPoints, iterations;
110 vec3_t points[ MAX_EXPANDED_AXIS ];
115 VectorCopy( a, points[ 0 ] );
116 VectorCopy( b, points[ 1 ] );
117 VectorCopy( c, points[ 2 ] );
120 for( i = 0; i + 2 < numPoints; i += 2 )
122 /* check subdivision limit */
123 if( numPoints + 2 >= MAX_EXPANDED_AXIS )
126 /* calculate new curve deltas */
127 for( j = 0; j < 3; j++ )
129 prev[ j ] = points[ i + 1 ][ j ] - points[ i ][ j ];
130 next[ j ] = points[ i + 2 ][ j ] - points[ i + 1 ][ j ];
131 mid[ j ] = (points[ i ][ j ] + points[ i + 1 ][ j ] * 2.0f + points[ i + 2 ][ j ]) * 0.25f;
134 /* see if this midpoint is off far enough to subdivide */
135 VectorSubtract( points[ i + 1 ], mid, delta );
136 len = VectorLength( delta );
143 /* create new points */
144 for( j = 0; j < 3; j++ )
146 prev[ j ] = 0.5f * (points[ i ][ j ] + points[ i + 1 ][ j ]);
147 next[ j ] = 0.5f * (points[ i + 1 ][ j ] + points[ i + 2 ][ j ]);
148 mid[ j ] = 0.5f * (prev[ j ] + next[ j ]);
151 /* push points out */
152 for( j = numPoints - 1; j > i + 3; j-- )
153 VectorCopy( points[ j - 2 ], points[ j ] );
155 /* insert new points */
156 VectorCopy( prev, points[ i + 1 ] );
157 VectorCopy( mid, points[ i + 2 ] );
158 VectorCopy( next, points[ i + 3 ] );
160 /* back up and recheck this set again, it may need more subdivision */
164 /* put the line on the curve */
165 for( i = 1; i < numPoints; i += 2 )
167 for( j = 0; j < 3; j++ )
169 prev[ j ] = 0.5f * (points[ i ][ j ] + points[ i + 1 ][ j ] );
170 next[ j ] = 0.5f * (points[ i ][ j ] + points[ i - 1 ][ j ] );
171 points[ i ][ j ] = 0.5f * (prev[ j ] + next[ j ]);
175 /* eliminate linear sections */
176 for( i = 0; i + 2 < numPoints; i++ )
179 VectorSubtract( points[ i + 1 ], points[ i ], delta );
180 len = VectorNormalize( delta, delta );
181 VectorSubtract( points[ i + 2 ], points[ i + 1 ], delta2 );
182 len2 = VectorNormalize( delta2, delta2 );
184 /* if either edge is degenerate, then eliminate it */
185 if( len < 0.0625f || len2 < 0.0625f || DotProduct( delta, delta2 ) >= 1.0f )
187 for( j = i + 1; j + 1 < numPoints; j++ )
188 VectorCopy( points[ j + 1 ], points[ j ] );
194 /* the number of iterations is 2^(points - 1) - 1 */
197 while( numPoints > 1 )
204 if( iterations > *maxIterations )
205 *maxIterations = iterations;
212 creates a mapDrawSurface_t from the patch text
215 void ParsePatch( qboolean onlyLights )
220 char texture[ MAX_QPATH ];
221 char shader[ MAX_QPATH ];
223 bspDrawVert_t *verts;
225 vec4_t delta, delta2, delta3;
234 strcpy( texture, token );
236 Parse1DMatrix( 5, info );
239 m.verts = verts = safe_malloc( m.width * m.height * sizeof( m.verts[0] ) );
241 if( m.width < 0 || m.width > MAX_PATCH_SIZE || m.height < 0 || m.height > MAX_PATCH_SIZE )
242 Error( "ParsePatch: bad size" );
245 for( j = 0; j < m.width ; j++ )
248 for( i = 0; i < m.height ; i++ )
250 Parse1DMatrix( 5, verts[ i * m.width + j ].xyz );
252 /* ydnar: fix colors */
253 for( k = 0; k < MAX_LIGHTMAPS; k++ )
255 verts[ i * m.width + j ].color[ k ][ 0 ] = 255;
256 verts[ i * m.width + j ].color[ k ][ 1 ] = 255;
257 verts[ i * m.width + j ].color[ k ][ 2 ] = 255;
258 verts[ i * m.width + j ].color[ k ][ 3 ] = 255;
265 // if brush primitives format, we may have some epairs to ignore here
267 if (g_bBrushPrimit!=BPRIMIT_OLDBRUSHES && strcmp(token,"}"))
281 if( noCurveBrushes || onlyLights )
285 /* ydnar: delete and warn about degenerate patches */
286 j = (m.width * m.height);
287 VectorClear( delta );
291 /* find first valid vector */
292 for( i = 1; i < j && delta[ 3 ] == 0; i++ )
294 VectorSubtract( m.verts[ 0 ].xyz, m.verts[ i ].xyz, delta );
295 delta[ 3 ] = VectorNormalize( delta, delta );
298 /* secondary degenerate test */
299 if( delta[ 3 ] == 0 )
303 /* if all vectors match this or are zero, then this is a degenerate patch */
304 for( i = 1; i < j && degenerate == qtrue; i++ )
306 VectorSubtract( m.verts[ 0 ].xyz, m.verts[ i ].xyz, delta2 );
307 delta2[ 3 ] = VectorNormalize( delta2, delta2 );
308 if( delta2[ 3 ] != 0 )
310 /* create inverse vector */
311 VectorCopy( delta2, delta3 );
312 delta3[ 3 ] = delta2[ 3 ];
313 VectorInverse( delta3 );
316 if( VectorCompare( delta, delta2 ) == qfalse && VectorCompare( delta, delta3 ) == qfalse )
322 /* warn and select degenerate patch */
325 xml_Select( "degenerate patch", mapEnt->mapEntityNum, entitySourceBrushes, qfalse );
330 /* find longest curve on the mesh */
333 for( j = 0; j + 2 < m.width; j += 2 )
335 for( i = 0; i + 2 < m.height; i += 2 )
337 ExpandLongestCurve( &longestCurve, verts[ i * m.width + j ].xyz, verts[ i * m.width + (j + 1) ].xyz, verts[ i * m.width + (j + 2) ].xyz ); /* row */
338 ExpandLongestCurve( &longestCurve, verts[ i * m.width + j ].xyz, verts[ (i + 1) * m.width + j ].xyz, verts[ (i + 2) * m.width + j ].xyz ); /* col */
339 ExpandMaxIterations( &maxIterations, patchSubdivisions, verts[ i * m.width + j ].xyz, verts[ i * m.width + (j + 1) ].xyz, verts[ i * m.width + (j + 2) ].xyz ); /* row */
340 ExpandMaxIterations( &maxIterations, patchSubdivisions, verts[ i * m.width + j ].xyz, verts[ (i + 1) * m.width + j ].xyz, verts[ (i + 2) * m.width + j ].xyz ); /* col */
344 /* allocate patch mesh */
345 pm = safe_malloc( sizeof( *pm ) );
346 memset( pm, 0, sizeof( *pm ) );
348 /* ydnar: add entity/brush numbering */
349 pm->entityNum = mapEnt->mapEntityNum;
350 pm->brushNum = entitySourceBrushes;
353 sprintf( shader, "textures/%s", texture );
354 pm->shaderInfo = ShaderInfoForShader( shader );
359 /* set longest curve */
360 pm->longestCurve = longestCurve;
361 pm->maxIterations = maxIterations;
363 /* link to the entity */
364 pm->next = mapEnt->patches;
365 mapEnt->patches = pm;
372 recursively adds patches to a lod group
375 static void GrowGroup_r( parseMesh_t *pm, int patchNum, int patchCount, parseMesh_t **meshes, byte *bordering, byte *group )
381 /* early out check */
382 if( group[ patchNum ] )
387 group[ patchNum ] = 1;
388 row = bordering + patchNum * patchCount;
391 if( meshes[ patchNum ]->longestCurve > pm->longestCurve )
392 pm->longestCurve = meshes[ patchNum ]->longestCurve;
393 if( meshes[ patchNum ]->maxIterations > pm->maxIterations )
394 pm->maxIterations = meshes[ patchNum ]->maxIterations;
396 /* walk other patches */
397 for( i = 0; i < patchCount; i++ )
400 GrowGroup_r( pm, i, patchCount, meshes, bordering, group );
407 any patches that share an edge need to choose their
408 level of detail as a unit, otherwise the edges would
412 void PatchMapDrawSurfs( entity_t *e )
414 int i, j, k, l, c1, c2;
416 parseMesh_t *check, *scan;
417 mapDrawSurface_t *ds;
418 int patchCount, groupCount;
419 bspDrawVert_t *v1, *v2;
423 /* ydnar: mac os x fails with these if not static */
424 MAC_STATIC parseMesh_t *meshes[ MAX_MAP_DRAW_SURFS ];
425 MAC_STATIC qb_t grouped[ MAX_MAP_DRAW_SURFS ];
426 MAC_STATIC byte group[ MAX_MAP_DRAW_SURFS ];
430 Sys_FPrintf( SYS_VRB, "--- PatchMapDrawSurfs ---\n" );
433 for ( pm = e->patches ; pm ; pm = pm->next ) {
434 meshes[patchCount] = pm;
441 bordering = safe_malloc( patchCount * patchCount );
442 memset( bordering, 0, patchCount * patchCount );
444 // build the bordering matrix
445 for ( k = 0 ; k < patchCount ; k++ ) {
446 bordering[k*patchCount+k] = 1;
448 for ( l = k+1 ; l < patchCount ; l++ ) {
451 c1 = scan->mesh.width * scan->mesh.height;
452 v1 = scan->mesh.verts;
454 for ( i = 0 ; i < c1 ; i++, v1++ ) {
455 c2 = check->mesh.width * check->mesh.height;
456 v2 = check->mesh.verts;
457 for ( j = 0 ; j < c2 ; j++, v2++ ) {
458 if ( fabs( v1->xyz[0] - v2->xyz[0] ) < 1.0
459 && fabs( v1->xyz[1] - v2->xyz[1] ) < 1.0
460 && fabs( v1->xyz[2] - v2->xyz[2] ) < 1.0 ) {
469 // we have a connection
470 bordering[k*patchCount+l] =
471 bordering[l*patchCount+k] = 1;
474 bordering[k*patchCount+l] =
475 bordering[l*patchCount+k] = 0;
482 memset( grouped, 0, patchCount );
484 for ( i = 0; i < patchCount; i++ )
489 /* start a new group */
493 /* recursively find all patches that belong in the same group */
494 memset( group, 0, patchCount );
495 GrowGroup_r( scan, i, patchCount, meshes, bordering, group );
498 ClearBounds( bounds[ 0 ], bounds[ 1 ] );
499 for( j = 0; j < patchCount; j++ )
503 grouped[ j ] = qtrue;
505 c1 = check->mesh.width * check->mesh.height;
506 v1 = check->mesh.verts;
507 for( k = 0; k < c1; k++, v1++ )
508 AddPointToBounds( v1->xyz, bounds[ 0 ], bounds[ 1 ] );
513 //% Sys_Printf( "Longest curve: %f Iterations: %d\n", scan->longestCurve, scan->maxIterations );
515 /* create drawsurf */
516 scan->grouped = qtrue;
517 ds = DrawSurfaceForMesh( e, scan, NULL ); /* ydnar */
518 VectorCopy( bounds[ 0 ], ds->bounds[ 0 ] );
519 VectorCopy( bounds[ 1 ], ds->bounds[ 1 ] );
522 /* emit some statistics */
523 Sys_FPrintf( SYS_VRB, "%9d patches\n", patchCount );
524 Sys_FPrintf( SYS_VRB, "%9d patch LOD groups\n", groupCount );