582 lines
14 KiB
C
582 lines
14 KiB
C
/* -------------------------------------------------------------------------------
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Copyright (C) 1999-2007 id Software, Inc. and contributors.
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For a list of contributors, see the accompanying CONTRIBUTORS file.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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----------------------------------------------------------------------------------
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This code has been altered significantly from its original form, to support
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several games based on the Quake III Arena engine, in the form of "Q3Map2."
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------------------------------------------------------------------------------- */
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/* marker */
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#define PATCH_C
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/* dependencies */
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#include "vmap.h"
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/*
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ExpandLongestCurve() - ydnar
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finds length of quadratic curve specified and determines if length is longer than the supplied max
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*/
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#define APPROX_SUBDIVISION 8
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static void ExpandLongestCurve( float *longestCurve, vec3_t a, vec3_t b, vec3_t c ){
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int i;
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float t, len;
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vec3_t ab, bc, ac, pt, last, delta;
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/* calc vectors */
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VectorSubtract( b, a, ab );
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if ( VectorNormalize( ab, ab ) < 0.125f ) {
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return;
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}
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VectorSubtract( c, b, bc );
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if ( VectorNormalize( bc, bc ) < 0.125f ) {
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return;
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}
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VectorSubtract( c, a, ac );
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if ( VectorNormalize( ac, ac ) < 0.125f ) {
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return;
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}
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/* if all 3 vectors are the same direction, then this edge is linear, so we ignore it */
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if ( DotProduct( ab, bc ) > 0.99f && DotProduct( ab, ac ) > 0.99f ) {
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return;
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}
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/* recalculate vectors */
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VectorSubtract( b, a, ab );
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VectorSubtract( c, b, bc );
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/* determine length */
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VectorCopy( a, last );
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for ( i = 0, len = 0.0f, t = 0.0f; i < APPROX_SUBDIVISION; i++, t += ( 1.0f / APPROX_SUBDIVISION ) )
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{
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/* calculate delta */
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delta[ 0 ] = ( ( 1.0f - t ) * ab[ 0 ] ) + ( t * bc[ 0 ] );
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delta[ 1 ] = ( ( 1.0f - t ) * ab[ 1 ] ) + ( t * bc[ 1 ] );
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delta[ 2 ] = ( ( 1.0f - t ) * ab[ 2 ] ) + ( t * bc[ 2 ] );
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/* add to first point and calculate pt-pt delta */
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VectorAdd( a, delta, pt );
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VectorSubtract( pt, last, delta );
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/* add it to length and store last point */
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len += VectorLength( delta );
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VectorCopy( pt, last );
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}
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/* longer? */
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if ( len > *longestCurve ) {
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*longestCurve = len;
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}
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}
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/*
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ExpandMaxIterations() - ydnar
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determines how many iterations a quadratic curve needs to be subdivided with to fit the specified error
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*/
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static void ExpandMaxIterations( int *maxIterations, int maxError, vec3_t a, vec3_t b, vec3_t c ){
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int i, j;
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vec3_t prev, next, mid, delta, delta2;
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float len, len2;
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int numPoints, iterations;
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vec3_t points[ MAX_EXPANDED_AXIS ];
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/* initial setup */
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numPoints = 3;
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VectorCopy( a, points[ 0 ] );
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VectorCopy( b, points[ 1 ] );
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VectorCopy( c, points[ 2 ] );
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/* subdivide */
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for ( i = 0; i + 2 < numPoints; i += 2 )
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{
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/* check subdivision limit */
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if ( numPoints + 2 >= MAX_EXPANDED_AXIS ) {
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break;
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}
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/* calculate new curve deltas */
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for ( j = 0; j < 3; j++ )
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{
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prev[ j ] = points[ i + 1 ][ j ] - points[ i ][ j ];
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next[ j ] = points[ i + 2 ][ j ] - points[ i + 1 ][ j ];
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mid[ j ] = ( points[ i ][ j ] + points[ i + 1 ][ j ] * 2.0f + points[ i + 2 ][ j ] ) * 0.25f;
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}
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/* see if this midpoint is off far enough to subdivide */
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VectorSubtract( points[ i + 1 ], mid, delta );
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len = VectorLength( delta );
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if ( len < maxError ) {
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continue;
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}
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/* subdivide */
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numPoints += 2;
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/* create new points */
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for ( j = 0; j < 3; j++ )
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{
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prev[ j ] = 0.5f * ( points[ i ][ j ] + points[ i + 1 ][ j ] );
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next[ j ] = 0.5f * ( points[ i + 1 ][ j ] + points[ i + 2 ][ j ] );
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mid[ j ] = 0.5f * ( prev[ j ] + next[ j ] );
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}
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/* push points out */
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for ( j = numPoints - 1; j > i + 3; j-- )
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VectorCopy( points[ j - 2 ], points[ j ] );
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/* insert new points */
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VectorCopy( prev, points[ i + 1 ] );
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VectorCopy( mid, points[ i + 2 ] );
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VectorCopy( next, points[ i + 3 ] );
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/* back up and recheck this set again, it may need more subdivision */
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i -= 2;
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}
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/* put the line on the curve */
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for ( i = 1; i < numPoints; i += 2 )
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{
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for ( j = 0; j < 3; j++ )
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{
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prev[ j ] = 0.5f * ( points[ i ][ j ] + points[ i + 1 ][ j ] );
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next[ j ] = 0.5f * ( points[ i ][ j ] + points[ i - 1 ][ j ] );
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points[ i ][ j ] = 0.5f * ( prev[ j ] + next[ j ] );
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}
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}
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/* eliminate linear sections */
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for ( i = 0; i + 2 < numPoints; i++ )
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{
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/* create vectors */
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VectorSubtract( points[ i + 1 ], points[ i ], delta );
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len = VectorNormalize( delta, delta );
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VectorSubtract( points[ i + 2 ], points[ i + 1 ], delta2 );
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len2 = VectorNormalize( delta2, delta2 );
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/* if either edge is degenerate, then eliminate it */
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if ( len < 0.0625f || len2 < 0.0625f || DotProduct( delta, delta2 ) >= 1.0f ) {
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for ( j = i + 1; j + 1 < numPoints; j++ )
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VectorCopy( points[ j + 1 ], points[ j ] );
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numPoints--;
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continue;
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}
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}
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/* the number of iterations is 2^(points - 1) - 1 */
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numPoints >>= 1;
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iterations = 0;
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while ( numPoints > 1 )
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{
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numPoints >>= 1;
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iterations++;
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}
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/* more? */
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if ( iterations > *maxIterations ) {
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*maxIterations = iterations;
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}
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}
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void ParseVertMatrix(bspDrawVert_t *v)
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{
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vec4_t vcol;
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int i;
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MatchToken( "(" );
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for ( i = 0; i < 3; i++ ) {
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GetToken( qfalse );
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v->xyz[i] = atof( token );
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}
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for ( i = 0; i < 2; i++ ) {
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GetToken( qfalse );
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v->st[i] = atof( token );
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}
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for ( i = 0; i < 4; i++ ) {
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GetToken( qfalse );
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if (!strcmp(token, ")"))
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break;
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vcol[i] = atof( token );
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}
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for ( ; i < 4; i++ ) {
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vcol[i] = 1;
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}
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if (strcmp(token, ")"))
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MatchToken( ")" );
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/* ydnar: fix colors */
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for ( i = 0; i < MAX_LIGHTMAPS; i++ )
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{
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v->color[ i ][ 0 ] = 255*vcol[0];
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v->color[ i ][ 1 ] = 255*vcol[1];
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v->color[ i ][ 2 ] = 255*vcol[2];
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v->color[ i ][ 3 ] = 255*vcol[3];
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}
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}
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/*
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ParsePatch()
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creates a mapDrawSurface_t from the patch text
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*/
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void ParsePatch( qboolean onlyLights, qboolean fixedtess, qboolean extended ){
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vec_t info[ 5 ];
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int i, j;
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parseMesh_t *pm;
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char texture[ MAX_QPATH ];
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char shader[ MAX_QPATH ];
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mesh_t m;
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bspDrawVert_t *verts;
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epair_t *ep;
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vec4_t delta, delta2, delta3;
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qboolean degenerate;
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float longestCurve;
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int maxIterations;
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MatchToken( "{" );
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/* get texture */
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GetToken( qtrue );
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strcpy( texture, token );
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if (extended)
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Parse1DMatrix( 7, info );
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else
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Parse1DMatrix( 5, info );
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//Hack for fixed tessellation
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/* info[2] = info[3] = 2;
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fixedtess = qtrue;*/
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m.width = info[0];
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m.height = info[1];
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if (extended) {
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m.subdiv_x = fixedtess?info[2]:-1;
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m.subdiv_y = fixedtess?info[3]:-1;
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} else {
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m.subdiv_x = fixedtess?info[0]:-1;
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m.subdiv_y = fixedtess?info[1]:-1;
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}
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if (m.subdiv_x == 0)
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m.subdiv_x = -1;
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if (m.subdiv_y == 0)
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m.subdiv_y = -1;
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m.verts = verts = safe_malloc( m.width * m.height * sizeof( m.verts[0] ) );
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if ( m.width < 0 || m.width > MAX_PATCH_SIZE || m.height < 0 || m.height > MAX_PATCH_SIZE ) {
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Error( "ParsePatch: bad size" );
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}
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MatchToken( "(" );
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for ( j = 0; j < m.width; j++ )
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{
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MatchToken( "(" );
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for ( i = 0; i < m.height; i++ )
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ParseVertMatrix(&verts[ i * m.width + j ]);
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MatchToken( ")" );
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}
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MatchToken( ")" );
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// if brush primitives format, we may have some epairs to ignore here
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GetToken( qtrue );
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if ( g_bBrushPrimit != BPRIMIT_OLDBRUSHES && strcmp( token,"}" ) ) {
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ep = ParseEPair();
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free( ep->key );
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free( ep->value );
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free( ep );
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}
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else{
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UnGetToken();
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}
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MatchToken( "}" );
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MatchToken( "}" );
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/* short circuit */
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if ( noCurveBrushes || onlyLights ) {
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return;
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}
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/* ydnar: delete and warn about degenerate patches */
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j = ( m.width * m.height );
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VectorClear( delta );
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delta[ 3 ] = 0;
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degenerate = qtrue;
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/* find first valid vector */
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for ( i = 1; i < j && delta[ 3 ] == 0; i++ )
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{
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VectorSubtract( m.verts[ 0 ].xyz, m.verts[ i ].xyz, delta );
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delta[ 3 ] = VectorNormalize( delta, delta );
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}
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/* secondary degenerate test */
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if ( delta[ 3 ] == 0 ) {
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degenerate = qtrue;
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}
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else
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{
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/* if all vectors match this or are zero, then this is a degenerate patch */
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for ( i = 1; i < j && degenerate == qtrue; i++ )
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{
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VectorSubtract( m.verts[ 0 ].xyz, m.verts[ i ].xyz, delta2 );
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delta2[ 3 ] = VectorNormalize( delta2, delta2 );
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if ( delta2[ 3 ] != 0 ) {
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/* create inverse vector */
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VectorCopy( delta2, delta3 );
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delta3[ 3 ] = delta2[ 3 ];
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VectorInverse( delta3 );
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/* compare */
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if ( VectorCompare( delta, delta2 ) == qfalse && VectorCompare( delta, delta3 ) == qfalse ) {
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degenerate = qfalse;
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}
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}
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}
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}
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/* warn and select degenerate patch */
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if ( degenerate ) {
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xml_Select( "degenerate patch", mapEnt->mapEntityNum, entitySourceBrushes, qfalse );
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free( m.verts );
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return;
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}
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/* find longest curve on the mesh */
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longestCurve = 0.0f;
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maxIterations = 0;
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if (!fixedtess)
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{
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for ( j = 0; j + 2 < m.width; j += 2 )
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{
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for ( i = 0; i + 2 < m.height; i += 2 )
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{
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ExpandLongestCurve( &longestCurve, verts[ i * m.width + j ].xyz, verts[ i * m.width + ( j + 1 ) ].xyz, verts[ i * m.width + ( j + 2 ) ].xyz ); /* row */
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ExpandLongestCurve( &longestCurve, verts[ i * m.width + j ].xyz, verts[ ( i + 1 ) * m.width + j ].xyz, verts[ ( i + 2 ) * m.width + j ].xyz ); /* col */
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ExpandMaxIterations( &maxIterations, patchSubdivisions, verts[ i * m.width + j ].xyz, verts[ i * m.width + ( j + 1 ) ].xyz, verts[ i * m.width + ( j + 2 ) ].xyz ); /* row */
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ExpandMaxIterations( &maxIterations, patchSubdivisions, verts[ i * m.width + j ].xyz, verts[ ( i + 1 ) * m.width + j ].xyz, verts[ ( i + 2 ) * m.width + j ].xyz ); /* col */
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}
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}
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}
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/* allocate patch mesh */
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pm = safe_malloc( sizeof( *pm ) );
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memset( pm, 0, sizeof( *pm ) );
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/* ydnar: add entity/brush numbering */
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pm->entityNum = mapEnt->mapEntityNum;
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pm->brushNum = entitySourceBrushes;
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/* set shader */
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sprintf( shader, "textures/%s", texture );
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pm->shaderInfo = ShaderInfoForShader( shader, 0 );
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/* set mesh */
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pm->mesh = m;
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/* set longest curve */
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pm->longestCurve = longestCurve;
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pm->maxIterations = maxIterations;
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/* link to the entity */
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pm->next = mapEnt->patches;
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mapEnt->patches = pm;
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}
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/*
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GrowGroup_r()
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recursively adds patches to a lod group
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*/
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static void GrowGroup_r( parseMesh_t *pm, int patchNum, int patchCount, parseMesh_t **meshes, byte *bordering, byte *group ){
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int i;
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const byte *row;
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/* early out check */
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if ( group[ patchNum ] ) {
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return;
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}
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/* set it */
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group[ patchNum ] = 1;
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row = bordering + patchNum * patchCount;
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/* check maximums */
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if ( meshes[ patchNum ]->longestCurve > pm->longestCurve ) {
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pm->longestCurve = meshes[ patchNum ]->longestCurve;
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}
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if ( meshes[ patchNum ]->maxIterations > pm->maxIterations ) {
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pm->maxIterations = meshes[ patchNum ]->maxIterations;
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}
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/* walk other patches */
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for ( i = 0; i < patchCount; i++ )
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{
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if ( row[ i ] ) {
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GrowGroup_r( pm, i, patchCount, meshes, bordering, group );
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}
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}
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}
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/*
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PatchMapDrawSurfs()
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any patches that share an edge need to choose their
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level of detail as a unit, otherwise the edges would
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pull apart.
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*/
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void PatchMapDrawSurfs( entity_t *e ){
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int i, j, k, l, c1, c2;
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parseMesh_t *pm;
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parseMesh_t *check, *scan;
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mapDrawSurface_t *ds;
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int patchCount, groupCount;
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bspDrawVert_t *v1, *v2;
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vec3_t bounds[ 2 ];
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byte *bordering;
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/* ydnar: mac os x fails with these if not static */
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MAC_STATIC parseMesh_t *meshes[ MAX_MAP_DRAW_SURFS ];
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MAC_STATIC qb_t grouped[ MAX_MAP_DRAW_SURFS ];
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MAC_STATIC byte group[ MAX_MAP_DRAW_SURFS ];
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/* note it */
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Sys_FPrintf( SYS_VRB, "--- PatchMapDrawSurfs ---\n" );
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patchCount = 0;
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for ( pm = e->patches; pm; pm = pm->next ) {
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meshes[patchCount] = pm;
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patchCount++;
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}
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if ( !patchCount ) {
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return;
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}
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bordering = safe_malloc( patchCount * patchCount );
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memset( bordering, 0, patchCount * patchCount );
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// build the bordering matrix
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for ( k = 0; k < patchCount; k++ ) {
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bordering[k * patchCount + k] = 1;
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for ( l = k + 1; l < patchCount; l++ ) {
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check = meshes[k];
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scan = meshes[l];
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c1 = scan->mesh.width * scan->mesh.height;
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v1 = scan->mesh.verts;
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for ( i = 0; i < c1; i++, v1++ ) {
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c2 = check->mesh.width * check->mesh.height;
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v2 = check->mesh.verts;
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for ( j = 0; j < c2; j++, v2++ ) {
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if ( fabs( v1->xyz[0] - v2->xyz[0] ) < 1.0
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&& fabs( v1->xyz[1] - v2->xyz[1] ) < 1.0
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&& fabs( v1->xyz[2] - v2->xyz[2] ) < 1.0 ) {
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break;
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}
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}
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if ( j != c2 ) {
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break;
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}
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}
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if ( i != c1 ) {
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// we have a connection
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bordering[k * patchCount + l] =
|
|
bordering[l * patchCount + k] = 1;
|
|
}
|
|
else {
|
|
// no connection
|
|
bordering[k * patchCount + l] =
|
|
bordering[l * patchCount + k] = 0;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/* build groups */
|
|
memset( grouped, 0, patchCount );
|
|
groupCount = 0;
|
|
for ( i = 0; i < patchCount; i++ )
|
|
{
|
|
/* get patch */
|
|
scan = meshes[ i ];
|
|
|
|
/* start a new group */
|
|
if ( !grouped[ i ] ) {
|
|
groupCount++;
|
|
}
|
|
|
|
/* recursively find all patches that belong in the same group */
|
|
memset( group, 0, patchCount );
|
|
GrowGroup_r( scan, i, patchCount, meshes, bordering, group );
|
|
|
|
/* bound them */
|
|
ClearBounds( bounds[ 0 ], bounds[ 1 ] );
|
|
for ( j = 0; j < patchCount; j++ )
|
|
{
|
|
if ( group[ j ] ) {
|
|
grouped[ j ] = qtrue;
|
|
check = meshes[ j ];
|
|
c1 = check->mesh.width * check->mesh.height;
|
|
v1 = check->mesh.verts;
|
|
for ( k = 0; k < c1; k++, v1++ )
|
|
AddPointToBounds( v1->xyz, bounds[ 0 ], bounds[ 1 ] );
|
|
}
|
|
}
|
|
|
|
/* debug code */
|
|
//% Sys_Printf( "Longest curve: %f Iterations: %d\n", scan->longestCurve, scan->maxIterations );
|
|
|
|
/* create drawsurf */
|
|
scan->grouped = qtrue;
|
|
ds = DrawSurfaceForMesh( e, scan, NULL ); /* ydnar */
|
|
VectorCopy( bounds[ 0 ], ds->bounds[ 0 ] );
|
|
VectorCopy( bounds[ 1 ], ds->bounds[ 1 ] );
|
|
}
|
|
|
|
/* emit some statistics */
|
|
Sys_FPrintf( SYS_VRB, "%9d patches\n", patchCount );
|
|
Sys_FPrintf( SYS_VRB, "%9d patch LOD groups\n", groupCount );
|
|
}
|