mirror of
https://github.com/UberGames/ioef.git
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554 lines
12 KiB
C
Executable file
554 lines
12 KiB
C
Executable file
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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 Foobar; 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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*/
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#include "qbsp.h"
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int c_fogFragment;
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int c_fogPatchFragments;
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/*
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====================
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DrawSurfToMesh
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====================
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*/
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mesh_t *DrawSurfToMesh( mapDrawSurface_t *ds ) {
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mesh_t *m;
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m = malloc( sizeof( *m ) );
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m->width = ds->patchWidth;
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m->height = ds->patchHeight;
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m->verts = malloc( sizeof(m->verts[0]) * m->width * m->height );
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memcpy( m->verts, ds->verts, sizeof(m->verts[0]) * m->width * m->height );
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return m;
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}
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/*
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====================
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SplitMeshByPlane
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====================
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*/
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void SplitMeshByPlane( mesh_t *in, vec3_t normal, float dist, mesh_t **front, mesh_t **back ) {
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int w, h, split;
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float d[MAX_PATCH_SIZE][MAX_PATCH_SIZE];
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drawVert_t *dv, *v1, *v2;
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int c_front, c_back, c_on;
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mesh_t *f, *b;
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int i;
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float frac;
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int frontAprox, backAprox;
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for ( i = 0 ; i < 2 ; i++ ) {
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dv = in->verts;
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c_front = 0;
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c_back = 0;
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c_on = 0;
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for ( h = 0 ; h < in->height ; h++ ) {
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for ( w = 0 ; w < in->width ; w++, dv++ ) {
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d[h][w] = DotProduct( dv->xyz, normal ) - dist;
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if ( d[h][w] > ON_EPSILON ) {
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c_front++;
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} else if ( d[h][w] < -ON_EPSILON ) {
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c_back++;
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} else {
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c_on++;
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}
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}
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}
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*front = NULL;
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*back = NULL;
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if ( !c_front ) {
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*back = in;
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return;
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}
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if ( !c_back ) {
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*front = in;
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return;
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}
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// find a split point
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split = -1;
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for ( w = 0 ; w < in->width -1 ; w++ ) {
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if ( ( d[0][w] < 0 ) != ( d[0][w+1] < 0 ) ) {
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if ( split == -1 ) {
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split = w;
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break;
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}
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}
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}
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if ( split == -1 ) {
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if ( i == 1 ) {
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qprintf( "No crossing points in patch\n");
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*front = in;
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return;
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}
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in = TransposeMesh( in );
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InvertMesh( in );
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continue;
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}
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// make sure the split point stays the same for all other rows
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for ( h = 1 ; h < in->height ; h++ ) {
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for ( w = 0 ; w < in->width -1 ; w++ ) {
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if ( ( d[h][w] < 0 ) != ( d[h][w+1] < 0 ) ) {
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if ( w != split ) {
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_printf( "multiple crossing points for patch -- can't clip\n");
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*front = in;
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return;
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}
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}
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}
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if ( ( d[h][split] < 0 ) == ( d[h][split+1] < 0 ) ) {
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_printf( "differing crossing points for patch -- can't clip\n");
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*front = in;
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return;
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}
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}
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break;
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}
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// create two new meshes
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f = malloc( sizeof( *f ) );
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f->width = split + 2;
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if ( ! (f->width & 1) ) {
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f->width++;
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frontAprox = 1;
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} else {
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frontAprox = 0;
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}
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if ( f->width > MAX_PATCH_SIZE ) {
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Error( "MAX_PATCH_SIZE after split");
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}
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f->height = in->height;
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f->verts = malloc( sizeof(f->verts[0]) * f->width * f->height );
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b = malloc( sizeof( *b ) );
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b->width = in->width - split;
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if ( ! (b->width & 1) ) {
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b->width++;
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backAprox = 1;
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} else {
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backAprox = 0;
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}
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if ( b->width > MAX_PATCH_SIZE ) {
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Error( "MAX_PATCH_SIZE after split");
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}
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b->height = in->height;
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b->verts = malloc( sizeof(b->verts[0]) * b->width * b->height );
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if ( d[0][0] > 0 ) {
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*front = f;
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*back = b;
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} else {
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*front = b;
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*back = f;
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}
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// distribute the points
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for ( w = 0 ; w < in->width ; w++ ) {
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for ( h = 0 ; h < in->height ; h++ ) {
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if ( w <= split ) {
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f->verts[ h * f->width + w ] = in->verts[ h * in->width + w ];
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} else {
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b->verts[ h * b->width + w - split + backAprox ] = in->verts[ h * in->width + w ];
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}
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}
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}
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// clip the crossing line
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for ( h = 0 ; h < in->height ; h++ ) {
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dv = &f->verts[ h * f->width + split + 1 ];
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v1 = &in->verts[ h * in->width + split ];
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v2 = &in->verts[ h * in->width + split + 1 ];
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frac = d[h][split] / ( d[h][split] - d[h][split+1] );
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for ( i = 0 ; i < 10 ; i++ ) {
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dv->xyz[i] = v1->xyz[i] + frac * ( v2->xyz[i] - v1->xyz[i] );
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}
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dv->xyz[10] = 0;//set all 4 colors to 0
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if ( frontAprox ) {
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f->verts[ h * f->width + split + 2 ] = *dv;
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}
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b->verts[ h * b->width ] = *dv;
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if ( backAprox ) {
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b->verts[ h * b->width + 1 ] = *dv;
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}
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}
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/*
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PrintMesh( in );
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_printf("\n");
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PrintMesh( f );
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_printf("\n");
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PrintMesh( b );
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_printf("\n");
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*/
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FreeMesh( in );
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}
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/*
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====================
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ChopPatchByBrush
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====================
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*/
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qboolean ChopPatchByBrush( mapDrawSurface_t *ds, bspbrush_t *b ) {
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int i, j;
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side_t *s;
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plane_t *plane;
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mesh_t *outside[MAX_BRUSH_SIDES];
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int numOutside;
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mesh_t *m, *front, *back;
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mapDrawSurface_t *newds;
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m = DrawSurfToMesh( ds );
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numOutside = 0;
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// only split by the top and bottom planes to avoid
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// some messy patch clipping issues
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for ( i = 4 ; i <= 5 ; i++ ) {
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s = &b->sides[ i ];
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plane = &mapplanes[ s->planenum ];
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SplitMeshByPlane( m, plane->normal, plane->dist, &front, &back );
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if ( !back ) {
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// nothing actually contained inside
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for ( j = 0 ; j < numOutside ; j++ ) {
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FreeMesh( outside[j] );
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}
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return qfalse;
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}
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m = back;
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if ( front ) {
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if ( numOutside == MAX_BRUSH_SIDES ) {
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Error( "MAX_BRUSH_SIDES" );
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}
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outside[ numOutside ] = front;
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numOutside++;
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}
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}
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// all of outside fragments become seperate drawsurfs
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c_fogPatchFragments += numOutside;
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for ( i = 0 ; i < numOutside ; i++ ) {
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newds = DrawSurfaceForMesh( outside[ i ] );
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newds->shaderInfo = ds->shaderInfo;
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FreeMesh( outside[ i ] );
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}
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// replace ds with m
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ds->patchWidth = m->width;
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ds->patchHeight = m->height;
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ds->numVerts = m->width * m->height;
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free( ds->verts );
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ds->verts = malloc( ds->numVerts * sizeof( *ds->verts ) );
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memcpy( ds->verts, m->verts, ds->numVerts * sizeof( *ds->verts ) );
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FreeMesh( m );
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return qtrue;
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}
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//===============================================================================
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/*
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====================
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WindingFromDrawSurf
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====================
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*/
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winding_t *WindingFromDrawSurf( mapDrawSurface_t *ds ) {
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winding_t *w;
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int i;
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w = AllocWinding( ds->numVerts );
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w->numpoints = ds->numVerts;
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for ( i = 0 ; i < ds->numVerts ; i++ ) {
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VectorCopy( ds->verts[i].xyz, w->p[i] );
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}
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return w;
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}
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/*
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====================
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ChopFaceByBrush
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There may be a fragment contained in the brush
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====================
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*/
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qboolean ChopFaceByBrush( mapDrawSurface_t *ds, bspbrush_t *b ) {
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int i, j;
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side_t *s;
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plane_t *plane;
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winding_t *w;
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winding_t *front, *back;
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winding_t *outside[MAX_BRUSH_SIDES];
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int numOutside;
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mapDrawSurface_t *newds;
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drawVert_t *dv;
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shaderInfo_t *si;
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float mins[2];
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// brush primitive :
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// axis base
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vec3_t texX,texY;
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vec_t x,y;
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w = WindingFromDrawSurf( ds );
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numOutside = 0;
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for ( i = 0 ; i < b->numsides ; i++ ) {
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s = &b->sides[ i ];
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if ( s->backSide ) {
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continue;
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}
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plane = &mapplanes[ s->planenum ];
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// handle coplanar outfacing (don't fog)
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if ( ds->side->planenum == s->planenum ) {
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return qfalse;
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}
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// handle coplanar infacing (keep inside)
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if ( ( ds->side->planenum ^ 1 ) == s->planenum ) {
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continue;
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}
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// general case
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ClipWindingEpsilon( w, plane->normal, plane->dist, ON_EPSILON,
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&front, &back );
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FreeWinding( w );
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if ( !back ) {
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// nothing actually contained inside
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for ( j = 0 ; j < numOutside ; j++ ) {
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FreeWinding( outside[j] );
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}
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return qfalse;
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}
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if ( front ) {
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if ( numOutside == MAX_BRUSH_SIDES ) {
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Error( "MAX_BRUSH_SIDES" );
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}
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outside[ numOutside ] = front;
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numOutside++;
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}
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w = back;
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}
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// all of outside fragments become seperate drawsurfs
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// linked to the same side
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c_fogFragment += numOutside;
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s = ds->side;
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for ( i = 0 ; i < numOutside ; i++ ) {
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newds = DrawSurfaceForSide( ds->mapBrush, s, outside[i] );
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FreeWinding( outside[i] );
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}
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// replace ds->verts with the verts for w
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ds->numVerts = w->numpoints;
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free( ds->verts );
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ds->verts = malloc( ds->numVerts * sizeof( *ds->verts ) );
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memset( ds->verts, 0, ds->numVerts * sizeof( *ds->verts ) );
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si = s->shaderInfo;
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mins[0] = 9999;
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mins[1] = 9999;
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// compute s/t coordinates from brush primitive texture matrix
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// compute axis base
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ComputeAxisBase( mapplanes[s->planenum].normal, texX, texY );
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for ( j = 0 ; j < w->numpoints ; j++ ) {
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dv = ds->verts + j;
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VectorCopy( w->p[j], dv->xyz );
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if (g_bBrushPrimit==BPRIMIT_OLDBRUSHES)
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{
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// calculate texture s/t
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dv->st[0] = s->vecs[0][3] + DotProduct( s->vecs[0], dv->xyz );
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dv->st[1] = s->vecs[1][3] + DotProduct( s->vecs[1], dv->xyz );
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dv->st[0] /= si->width;
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dv->st[1] /= si->height;
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}
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else
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{
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// calculate texture s/t from brush primitive texture matrix
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x = DotProduct( dv->xyz, texX );
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y = DotProduct( dv->xyz, texY );
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dv->st[0]=s->texMat[0][0]*x+s->texMat[0][1]*y+s->texMat[0][2];
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dv->st[1]=s->texMat[1][0]*x+s->texMat[1][1]*y+s->texMat[1][2];
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}
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if ( dv->st[0] < mins[0] ) {
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mins[0] = dv->st[0];
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}
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if ( dv->st[1] < mins[1] ) {
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mins[1] = dv->st[1];
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}
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// copy normal
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VectorCopy ( mapplanes[s->planenum].normal, dv->normal );
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}
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// adjust the texture coordinates to be as close to 0 as possible
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if ( !si->globalTexture ) {
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mins[0] = floor( mins[0] );
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mins[1] = floor( mins[1] );
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for ( i = 0 ; i < w->numpoints ; i++ ) {
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dv = ds->verts + i;
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dv->st[0] -= mins[0];
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dv->st[1] -= mins[1];
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}
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}
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return qtrue;
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}
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//===============================================================================
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/*
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=====================
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FogDrawSurfs
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Call after the surface list has been pruned,
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before tjunction fixing
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before lightmap allocation
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=====================
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*/
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void FogDrawSurfs( void ) {
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int i, j, k;
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mapDrawSurface_t *ds;
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bspbrush_t *b;
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vec3_t mins, maxs;
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int c_fogged;
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int numBaseDrawSurfs;
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dfog_t *fog;
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qprintf("----- FogDrawsurfs -----\n");
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c_fogged = 0;
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c_fogFragment = 0;
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// find all fog brushes
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for ( b = entities[0].brushes ; b ; b = b->next ) {
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if ( !(b->contents & CONTENTS_FOG) ) {
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continue;
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}
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if ( numFogs == MAX_MAP_FOGS ) {
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Error( "MAX_MAP_FOGS" );
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}
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fog = &dfogs[numFogs];
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numFogs++;
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fog->brushNum = b->outputNumber;
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// find a side with a valid shaderInfo
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// non-axial fog columns may have bevel planes that need to be skipped
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for ( i = 0 ; i < b->numsides ; i++ ) {
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if ( b->sides[i].shaderInfo && (b->sides[i].shaderInfo->contents & CONTENTS_FOG) ) {
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strcpy( fog->shader, b->sides[i].shaderInfo->shader );
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break;
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}
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}
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if ( i == b->numsides ) {
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continue; // shouldn't happen
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}
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fog->visibleSide = -1;
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// clip each surface into this, but don't clip any of
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// the resulting fragments to the same brush
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numBaseDrawSurfs = numMapDrawSurfs;
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for ( i = 0 ; i < numBaseDrawSurfs ; i++ ) {
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ds = &mapDrawSurfs[i];
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// bound the drawsurf
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ClearBounds( mins, maxs );
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for ( j = 0 ; j < ds->numVerts ; j++ ) {
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AddPointToBounds( ds->verts[j].xyz, mins, maxs );
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}
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// check against the fog brush
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for ( k = 0 ; k < 3 ; k++ ) {
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if ( mins[k] > b->maxs[k] ) {
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break;
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}
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if ( maxs[k] < b->mins[k] ) {
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break;
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}
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}
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if ( k < 3 ) {
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continue; // bboxes don't intersect
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}
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if ( ds->mapBrush == b ) {
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int s;
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s = ds->side - b->sides;
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if ( s <= 6 ) { // not one of the reversed inside faces
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// this is a visible fog plane
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if ( fog->visibleSide != -1 ) {
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_printf( "WARNING: fog brush %i has multiple visible sides\n", b->brushnum );
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}
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fog->visibleSide = s;
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}
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}
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if ( ds->miscModel ) {
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// we could write splitting code for trimodels if we wanted to...
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c_fogged++;
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ds->fogNum = numFogs - 1;
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} else if ( ds->patch ) {
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if ( ChopPatchByBrush( ds, b ) ) {
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c_fogged++;
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ds->fogNum = numFogs - 1;
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}
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} else {
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if ( ChopFaceByBrush( ds, b ) ) {
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c_fogged++;
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ds->fogNum = numFogs - 1;
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}
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}
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}
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}
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|
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// split the drawsurfs by the fog brushes
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|
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qprintf( "%5i fogs\n", numFogs );
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qprintf( "%5i fog polygon fragments\n", c_fogFragment );
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qprintf( "%5i fog patch fragments\n", c_fogPatchFragments );
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qprintf( "%5i fogged drawsurfs\n", c_fogged );
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}
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