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625 lines
16 KiB
C
625 lines
16 KiB
C
/*
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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 Quake III Arena source code; 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 "tr_local.h"
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/*
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This file does all of the processing necessary to turn a raw grid of points
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read from the map file into a srfGridMesh_t ready for rendering.
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The level of detail solution is direction independent, based only on subdivided
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distance from the true curve.
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Only a single entry point:
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srfGridMesh_t *R_SubdividePatchToGrid( int width, int height,
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drawVert_t points[MAX_PATCH_SIZE*MAX_PATCH_SIZE] ) {
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*/
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/*
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============
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LerpDrawVert
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============
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*/
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static void LerpDrawVert( drawVert_t *a, drawVert_t *b, drawVert_t *out ) {
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out->xyz[0] = 0.5f * (a->xyz[0] + b->xyz[0]);
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out->xyz[1] = 0.5f * (a->xyz[1] + b->xyz[1]);
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out->xyz[2] = 0.5f * (a->xyz[2] + b->xyz[2]);
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out->st[0] = 0.5f * (a->st[0] + b->st[0]);
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out->st[1] = 0.5f * (a->st[1] + b->st[1]);
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out->lightmap[0] = 0.5f * (a->lightmap[0] + b->lightmap[0]);
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out->lightmap[1] = 0.5f * (a->lightmap[1] + b->lightmap[1]);
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out->color[0] = (a->color[0] + b->color[0]) >> 1;
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out->color[1] = (a->color[1] + b->color[1]) >> 1;
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out->color[2] = (a->color[2] + b->color[2]) >> 1;
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out->color[3] = (a->color[3] + b->color[3]) >> 1;
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}
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/*
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============
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Transpose
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============
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*/
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static void Transpose( int width, int height, drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE] ) {
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int i, j;
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drawVert_t temp;
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if ( width > height ) {
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for ( i = 0 ; i < height ; i++ ) {
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for ( j = i + 1 ; j < width ; j++ ) {
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if ( j < height ) {
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// swap the value
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temp = ctrl[j][i];
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ctrl[j][i] = ctrl[i][j];
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ctrl[i][j] = temp;
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} else {
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// just copy
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ctrl[j][i] = ctrl[i][j];
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}
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}
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}
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} else {
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for ( i = 0 ; i < width ; i++ ) {
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for ( j = i + 1 ; j < height ; j++ ) {
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if ( j < width ) {
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// swap the value
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temp = ctrl[i][j];
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ctrl[i][j] = ctrl[j][i];
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ctrl[j][i] = temp;
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} else {
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// just copy
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ctrl[i][j] = ctrl[j][i];
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}
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}
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}
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}
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}
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/*
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=================
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MakeMeshNormals
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Handles all the complicated wrapping and degenerate cases
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=================
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*/
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static void MakeMeshNormals( int width, int height, drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE] ) {
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int i, j, k, dist;
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vec3_t normal;
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vec3_t sum;
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int count = 0;
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vec3_t base;
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vec3_t delta;
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int x, y;
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drawVert_t *dv;
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vec3_t around[8], temp;
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qboolean good[8];
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qboolean wrapWidth, wrapHeight;
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float len;
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static int neighbors[8][2] = {
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{0,1}, {1,1}, {1,0}, {1,-1}, {0,-1}, {-1,-1}, {-1,0}, {-1,1}
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};
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wrapWidth = qfalse;
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for ( i = 0 ; i < height ; i++ ) {
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VectorSubtract( ctrl[i][0].xyz, ctrl[i][width-1].xyz, delta );
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len = VectorLengthSquared( delta );
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if ( len > 1.0 ) {
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break;
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}
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}
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if ( i == height ) {
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wrapWidth = qtrue;
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}
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wrapHeight = qfalse;
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for ( i = 0 ; i < width ; i++ ) {
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VectorSubtract( ctrl[0][i].xyz, ctrl[height-1][i].xyz, delta );
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len = VectorLengthSquared( delta );
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if ( len > 1.0 ) {
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break;
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}
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}
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if ( i == width) {
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wrapHeight = qtrue;
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}
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for ( i = 0 ; i < width ; i++ ) {
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for ( j = 0 ; j < height ; j++ ) {
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count = 0;
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dv = &ctrl[j][i];
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VectorCopy( dv->xyz, base );
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for ( k = 0 ; k < 8 ; k++ ) {
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VectorClear( around[k] );
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good[k] = qfalse;
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for ( dist = 1 ; dist <= 3 ; dist++ ) {
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x = i + neighbors[k][0] * dist;
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y = j + neighbors[k][1] * dist;
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if ( wrapWidth ) {
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if ( x < 0 ) {
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x = width - 1 + x;
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} else if ( x >= width ) {
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x = 1 + x - width;
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}
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}
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if ( wrapHeight ) {
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if ( y < 0 ) {
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y = height - 1 + y;
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} else if ( y >= height ) {
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y = 1 + y - height;
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}
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}
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if ( x < 0 || x >= width || y < 0 || y >= height ) {
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break; // edge of patch
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}
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VectorSubtract( ctrl[y][x].xyz, base, temp );
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if ( VectorNormalize2( temp, temp ) == 0 ) {
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continue; // degenerate edge, get more dist
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} else {
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good[k] = qtrue;
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VectorCopy( temp, around[k] );
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break; // good edge
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}
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}
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}
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VectorClear( sum );
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for ( k = 0 ; k < 8 ; k++ ) {
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if ( !good[k] || !good[(k+1)&7] ) {
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continue; // didn't get two points
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}
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CrossProduct( around[(k+1)&7], around[k], normal );
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if ( VectorNormalize2( normal, normal ) == 0 ) {
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continue;
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}
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VectorAdd( normal, sum, sum );
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count++;
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}
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//if ( count == 0 ) {
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// printf("bad normal\n");
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//}
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VectorNormalize2( sum, dv->normal );
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}
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}
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}
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/*
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============
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InvertCtrl
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============
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*/
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static void InvertCtrl( int width, int height, drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE] ) {
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int i, j;
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drawVert_t temp;
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for ( i = 0 ; i < height ; i++ ) {
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for ( j = 0 ; j < width/2 ; j++ ) {
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temp = ctrl[i][j];
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ctrl[i][j] = ctrl[i][width-1-j];
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ctrl[i][width-1-j] = temp;
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}
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}
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}
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/*
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=================
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InvertErrorTable
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=================
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*/
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static void InvertErrorTable( float errorTable[2][MAX_GRID_SIZE], int width, int height ) {
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int i;
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float copy[2][MAX_GRID_SIZE];
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Com_Memcpy( copy, errorTable, sizeof( copy ) );
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for ( i = 0 ; i < width ; i++ ) {
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errorTable[1][i] = copy[0][i]; //[width-1-i];
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}
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for ( i = 0 ; i < height ; i++ ) {
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errorTable[0][i] = copy[1][height-1-i];
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}
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}
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/*
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==================
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PutPointsOnCurve
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==================
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*/
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static void PutPointsOnCurve( drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE],
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int width, int height ) {
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int i, j;
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drawVert_t prev, next;
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for ( i = 0 ; i < width ; i++ ) {
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for ( j = 1 ; j < height ; j += 2 ) {
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LerpDrawVert( &ctrl[j][i], &ctrl[j+1][i], &prev );
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LerpDrawVert( &ctrl[j][i], &ctrl[j-1][i], &next );
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LerpDrawVert( &prev, &next, &ctrl[j][i] );
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}
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}
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for ( j = 0 ; j < height ; j++ ) {
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for ( i = 1 ; i < width ; i += 2 ) {
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LerpDrawVert( &ctrl[j][i], &ctrl[j][i+1], &prev );
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LerpDrawVert( &ctrl[j][i], &ctrl[j][i-1], &next );
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LerpDrawVert( &prev, &next, &ctrl[j][i] );
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}
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}
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}
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/*
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=================
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R_CreateSurfaceGridMesh
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=================
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*/
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srfGridMesh_t *R_CreateSurfaceGridMesh(int width, int height,
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drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE], float errorTable[2][MAX_GRID_SIZE] ) {
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int i, j, size;
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drawVert_t *vert;
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vec3_t tmpVec;
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srfGridMesh_t *grid;
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// copy the results out to a grid
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size = (width * height - 1) * sizeof( drawVert_t ) + sizeof( *grid );
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#ifdef PATCH_STITCHING
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grid = /*ri.Hunk_Alloc*/ ri.Malloc( size );
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Com_Memset(grid, 0, size);
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grid->widthLodError = /*ri.Hunk_Alloc*/ ri.Malloc( width * 4 );
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Com_Memcpy( grid->widthLodError, errorTable[0], width * 4 );
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grid->heightLodError = /*ri.Hunk_Alloc*/ ri.Malloc( height * 4 );
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Com_Memcpy( grid->heightLodError, errorTable[1], height * 4 );
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#else
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grid = ri.Hunk_Alloc( size );
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Com_Memset(grid, 0, size);
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grid->widthLodError = ri.Hunk_Alloc( width * 4 );
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Com_Memcpy( grid->widthLodError, errorTable[0], width * 4 );
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grid->heightLodError = ri.Hunk_Alloc( height * 4 );
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Com_Memcpy( grid->heightLodError, errorTable[1], height * 4 );
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#endif
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grid->width = width;
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grid->height = height;
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grid->surfaceType = SF_GRID;
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ClearBounds( grid->meshBounds[0], grid->meshBounds[1] );
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for ( i = 0 ; i < width ; i++ ) {
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for ( j = 0 ; j < height ; j++ ) {
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vert = &grid->verts[j*width+i];
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*vert = ctrl[j][i];
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AddPointToBounds( vert->xyz, grid->meshBounds[0], grid->meshBounds[1] );
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}
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}
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// compute local origin and bounds
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VectorAdd( grid->meshBounds[0], grid->meshBounds[1], grid->localOrigin );
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VectorScale( grid->localOrigin, 0.5f, grid->localOrigin );
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VectorSubtract( grid->meshBounds[0], grid->localOrigin, tmpVec );
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grid->meshRadius = VectorLength( tmpVec );
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VectorCopy( grid->localOrigin, grid->lodOrigin );
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grid->lodRadius = grid->meshRadius;
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//
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return grid;
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}
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/*
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=================
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R_FreeSurfaceGridMesh
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=================
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*/
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void R_FreeSurfaceGridMesh( srfGridMesh_t *grid ) {
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ri.Free(grid->widthLodError);
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ri.Free(grid->heightLodError);
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ri.Free(grid);
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}
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/*
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=================
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R_SubdividePatchToGrid
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=================
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*/
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srfGridMesh_t *R_SubdividePatchToGrid( int width, int height,
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drawVert_t points[MAX_PATCH_SIZE*MAX_PATCH_SIZE] ) {
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int i, j, k, l;
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drawVert_t_cleared( prev );
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drawVert_t_cleared( next );
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drawVert_t_cleared( mid );
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float len, maxLen;
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int dir;
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int t;
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drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE];
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float errorTable[2][MAX_GRID_SIZE];
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for ( i = 0 ; i < width ; i++ ) {
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for ( j = 0 ; j < height ; j++ ) {
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ctrl[j][i] = points[j*width+i];
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}
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}
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for ( dir = 0 ; dir < 2 ; dir++ ) {
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for ( j = 0 ; j < MAX_GRID_SIZE ; j++ ) {
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errorTable[dir][j] = 0;
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}
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// horizontal subdivisions
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for ( j = 0 ; j + 2 < width ; j += 2 ) {
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// check subdivided midpoints against control points
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// FIXME: also check midpoints of adjacent patches against the control points
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// this would basically stitch all patches in the same LOD group together.
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maxLen = 0;
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for ( i = 0 ; i < height ; i++ ) {
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vec3_t midxyz;
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vec3_t midxyz2;
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vec3_t dir;
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vec3_t projected;
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float d;
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// calculate the point on the curve
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for ( l = 0 ; l < 3 ; l++ ) {
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midxyz[l] = (ctrl[i][j].xyz[l] + ctrl[i][j+1].xyz[l] * 2
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+ ctrl[i][j+2].xyz[l] ) * 0.25f;
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}
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// see how far off the line it is
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// using dist-from-line will not account for internal
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// texture warping, but it gives a lot less polygons than
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// dist-from-midpoint
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VectorSubtract( midxyz, ctrl[i][j].xyz, midxyz );
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VectorSubtract( ctrl[i][j+2].xyz, ctrl[i][j].xyz, dir );
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VectorNormalize( dir );
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d = DotProduct( midxyz, dir );
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VectorScale( dir, d, projected );
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VectorSubtract( midxyz, projected, midxyz2);
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len = VectorLengthSquared( midxyz2 ); // we will do the sqrt later
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if ( len > maxLen ) {
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maxLen = len;
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}
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}
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maxLen = sqrt(maxLen);
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// if all the points are on the lines, remove the entire columns
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if ( maxLen < 0.1f ) {
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errorTable[dir][j+1] = 999;
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continue;
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}
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// see if we want to insert subdivided columns
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if ( width + 2 > MAX_GRID_SIZE ) {
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errorTable[dir][j+1] = 1.0f/maxLen;
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continue; // can't subdivide any more
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}
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if ( maxLen <= r_subdivisions->value ) {
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errorTable[dir][j+1] = 1.0f/maxLen;
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continue; // didn't need subdivision
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}
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errorTable[dir][j+2] = 1.0f/maxLen;
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// insert two columns and replace the peak
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width += 2;
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for ( i = 0 ; i < height ; i++ ) {
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LerpDrawVert( &ctrl[i][j], &ctrl[i][j+1], &prev );
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LerpDrawVert( &ctrl[i][j+1], &ctrl[i][j+2], &next );
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LerpDrawVert( &prev, &next, &mid );
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for ( k = width - 1 ; k > j + 3 ; k-- ) {
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ctrl[i][k] = ctrl[i][k-2];
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}
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ctrl[i][j + 1] = prev;
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ctrl[i][j + 2] = mid;
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ctrl[i][j + 3] = next;
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}
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// back up and recheck this set again, it may need more subdivision
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j -= 2;
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}
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Transpose( width, height, ctrl );
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t = width;
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width = height;
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height = t;
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}
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// put all the aproximating points on the curve
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PutPointsOnCurve( ctrl, width, height );
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// cull out any rows or columns that are colinear
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for ( i = 1 ; i < width-1 ; i++ ) {
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if ( errorTable[0][i] != 999 ) {
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continue;
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}
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for ( j = i+1 ; j < width ; j++ ) {
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for ( k = 0 ; k < height ; k++ ) {
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ctrl[k][j-1] = ctrl[k][j];
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}
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errorTable[0][j-1] = errorTable[0][j];
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}
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width--;
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}
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for ( i = 1 ; i < height-1 ; i++ ) {
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if ( errorTable[1][i] != 999 ) {
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continue;
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}
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for ( j = i+1 ; j < height ; j++ ) {
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for ( k = 0 ; k < width ; k++ ) {
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ctrl[j-1][k] = ctrl[j][k];
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}
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errorTable[1][j-1] = errorTable[1][j];
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}
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height--;
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}
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#if 1
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// flip for longest tristrips as an optimization
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// the results should be visually identical with or
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// without this step
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if ( height > width ) {
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Transpose( width, height, ctrl );
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InvertErrorTable( errorTable, width, height );
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t = width;
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width = height;
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height = t;
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InvertCtrl( width, height, ctrl );
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}
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#endif
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// calculate normals
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MakeMeshNormals( width, height, ctrl );
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return R_CreateSurfaceGridMesh( width, height, ctrl, errorTable );
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}
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/*
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===============
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R_GridInsertColumn
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===============
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*/
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srfGridMesh_t *R_GridInsertColumn( srfGridMesh_t *grid, int column, int row, vec3_t point, float loderror ) {
|
|
int i, j;
|
|
int width, height, oldwidth;
|
|
drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE];
|
|
float errorTable[2][MAX_GRID_SIZE];
|
|
float lodRadius;
|
|
vec3_t lodOrigin;
|
|
|
|
oldwidth = 0;
|
|
width = grid->width + 1;
|
|
if (width > MAX_GRID_SIZE)
|
|
return NULL;
|
|
height = grid->height;
|
|
for (i = 0; i < width; i++) {
|
|
if (i == column) {
|
|
//insert new column
|
|
for (j = 0; j < grid->height; j++) {
|
|
LerpDrawVert( &grid->verts[j * grid->width + i-1], &grid->verts[j * grid->width + i], &ctrl[j][i] );
|
|
if (j == row)
|
|
VectorCopy(point, ctrl[j][i].xyz);
|
|
}
|
|
errorTable[0][i] = loderror;
|
|
continue;
|
|
}
|
|
errorTable[0][i] = grid->widthLodError[oldwidth];
|
|
for (j = 0; j < grid->height; j++) {
|
|
ctrl[j][i] = grid->verts[j * grid->width + oldwidth];
|
|
}
|
|
oldwidth++;
|
|
}
|
|
for (j = 0; j < grid->height; j++) {
|
|
errorTable[1][j] = grid->heightLodError[j];
|
|
}
|
|
// put all the aproximating points on the curve
|
|
//PutPointsOnCurve( ctrl, width, height );
|
|
// calculate normals
|
|
MakeMeshNormals( width, height, ctrl );
|
|
|
|
VectorCopy(grid->lodOrigin, lodOrigin);
|
|
lodRadius = grid->lodRadius;
|
|
// free the old grid
|
|
R_FreeSurfaceGridMesh(grid);
|
|
// create a new grid
|
|
grid = R_CreateSurfaceGridMesh( width, height, ctrl, errorTable );
|
|
grid->lodRadius = lodRadius;
|
|
VectorCopy(lodOrigin, grid->lodOrigin);
|
|
return grid;
|
|
}
|
|
|
|
/*
|
|
===============
|
|
R_GridInsertRow
|
|
===============
|
|
*/
|
|
srfGridMesh_t *R_GridInsertRow( srfGridMesh_t *grid, int row, int column, vec3_t point, float loderror ) {
|
|
int i, j;
|
|
int width, height, oldheight;
|
|
drawVert_t ctrl[MAX_GRID_SIZE][MAX_GRID_SIZE];
|
|
float errorTable[2][MAX_GRID_SIZE];
|
|
float lodRadius;
|
|
vec3_t lodOrigin;
|
|
|
|
oldheight = 0;
|
|
width = grid->width;
|
|
height = grid->height + 1;
|
|
if (height > MAX_GRID_SIZE)
|
|
return NULL;
|
|
for (i = 0; i < height; i++) {
|
|
if (i == row) {
|
|
//insert new row
|
|
for (j = 0; j < grid->width; j++) {
|
|
LerpDrawVert( &grid->verts[(i-1) * grid->width + j], &grid->verts[i * grid->width + j], &ctrl[i][j] );
|
|
if (j == column)
|
|
VectorCopy(point, ctrl[i][j].xyz);
|
|
}
|
|
errorTable[1][i] = loderror;
|
|
continue;
|
|
}
|
|
errorTable[1][i] = grid->heightLodError[oldheight];
|
|
for (j = 0; j < grid->width; j++) {
|
|
ctrl[i][j] = grid->verts[oldheight * grid->width + j];
|
|
}
|
|
oldheight++;
|
|
}
|
|
for (j = 0; j < grid->width; j++) {
|
|
errorTable[0][j] = grid->widthLodError[j];
|
|
}
|
|
// put all the aproximating points on the curve
|
|
//PutPointsOnCurve( ctrl, width, height );
|
|
// calculate normals
|
|
MakeMeshNormals( width, height, ctrl );
|
|
|
|
VectorCopy(grid->lodOrigin, lodOrigin);
|
|
lodRadius = grid->lodRadius;
|
|
// free the old grid
|
|
R_FreeSurfaceGridMesh(grid);
|
|
// create a new grid
|
|
grid = R_CreateSurfaceGridMesh( width, height, ctrl, errorTable );
|
|
grid->lodRadius = lodRadius;
|
|
VectorCopy(lodOrigin, grid->lodOrigin);
|
|
return grid;
|
|
}
|