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-rw-r--r--code/renderer/tr_marks.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/code/renderer/tr_marks.c b/code/renderer/tr_marks.c
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+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Quake III Arena source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Quake III Arena source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+===========================================================================
+*/
+// tr_marks.c -- polygon projection on the world polygons
+
+#include "tr_local.h"
+//#include "assert.h"
+
+#define MAX_VERTS_ON_POLY 64
+
+#define MARKER_OFFSET 0 // 1
+
+/*
+=============
+R_ChopPolyBehindPlane
+
+Out must have space for two more vertexes than in
+=============
+*/
+#define SIDE_FRONT 0
+#define SIDE_BACK 1
+#define SIDE_ON 2
+static void R_ChopPolyBehindPlane( int numInPoints, vec3_t inPoints[MAX_VERTS_ON_POLY],
+ int *numOutPoints, vec3_t outPoints[MAX_VERTS_ON_POLY],
+ vec3_t normal, vec_t dist, vec_t epsilon) {
+ float dists[MAX_VERTS_ON_POLY+4];
+ int sides[MAX_VERTS_ON_POLY+4];
+ int counts[3];
+ float dot;
+ int i, j;
+ float *p1, *p2, *clip;
+ float d;
+
+ // don't clip if it might overflow
+ if ( numInPoints >= MAX_VERTS_ON_POLY - 2 ) {
+ *numOutPoints = 0;
+ return;
+ }
+
+ counts[0] = counts[1] = counts[2] = 0;
+
+ // determine sides for each point
+ for ( i = 0 ; i < numInPoints ; i++ ) {
+ dot = DotProduct( inPoints[i], normal );
+ dot -= dist;
+ dists[i] = dot;
+ if ( dot > epsilon ) {
+ sides[i] = SIDE_FRONT;
+ } else if ( dot < -epsilon ) {
+ sides[i] = SIDE_BACK;
+ } else {
+ sides[i] = SIDE_ON;
+ }
+ counts[sides[i]]++;
+ }
+ sides[i] = sides[0];
+ dists[i] = dists[0];
+
+ *numOutPoints = 0;
+
+ if ( !counts[0] ) {
+ return;
+ }
+ if ( !counts[1] ) {
+ *numOutPoints = numInPoints;
+ Com_Memcpy( outPoints, inPoints, numInPoints * sizeof(vec3_t) );
+ return;
+ }
+
+ for ( i = 0 ; i < numInPoints ; i++ ) {
+ p1 = inPoints[i];
+ clip = outPoints[ *numOutPoints ];
+
+ if ( sides[i] == SIDE_ON ) {
+ VectorCopy( p1, clip );
+ (*numOutPoints)++;
+ continue;
+ }
+
+ if ( sides[i] == SIDE_FRONT ) {
+ VectorCopy( p1, clip );
+ (*numOutPoints)++;
+ clip = outPoints[ *numOutPoints ];
+ }
+
+ if ( sides[i+1] == SIDE_ON || sides[i+1] == sides[i] ) {
+ continue;
+ }
+
+ // generate a split point
+ p2 = inPoints[ (i+1) % numInPoints ];
+
+ d = dists[i] - dists[i+1];
+ if ( d == 0 ) {
+ dot = 0;
+ } else {
+ dot = dists[i] / d;
+ }
+
+ // clip xyz
+
+ for (j=0 ; j<3 ; j++) {
+ clip[j] = p1[j] + dot * ( p2[j] - p1[j] );
+ }
+
+ (*numOutPoints)++;
+ }
+}
+
+/*
+=================
+R_BoxSurfaces_r
+
+=================
+*/
+void R_BoxSurfaces_r(mnode_t *node, vec3_t mins, vec3_t maxs, surfaceType_t **list, int listsize, int *listlength, vec3_t dir) {
+
+ int s, c;
+ msurface_t *surf, **mark;
+
+ // do the tail recursion in a loop
+ while ( node->contents == -1 ) {
+ s = BoxOnPlaneSide( mins, maxs, node->plane );
+ if (s == 1) {
+ node = node->children[0];
+ } else if (s == 2) {
+ node = node->children[1];
+ } else {
+ R_BoxSurfaces_r(node->children[0], mins, maxs, list, listsize, listlength, dir);
+ node = node->children[1];
+ }
+ }
+
+ // add the individual surfaces
+ mark = node->firstmarksurface;
+ c = node->nummarksurfaces;
+ while (c--) {
+ //
+ if (*listlength >= listsize) break;
+ //
+ surf = *mark;
+ // check if the surface has NOIMPACT or NOMARKS set
+ if ( ( surf->shader->surfaceFlags & ( SURF_NOIMPACT | SURF_NOMARKS ) )
+ || ( surf->shader->contentFlags & CONTENTS_FOG ) ) {
+ surf->viewCount = tr.viewCount;
+ }
+ // extra check for surfaces to avoid list overflows
+ else if (*(surf->data) == SF_FACE) {
+ // the face plane should go through the box
+ s = BoxOnPlaneSide( mins, maxs, &(( srfSurfaceFace_t * ) surf->data)->plane );
+ if (s == 1 || s == 2) {
+ surf->viewCount = tr.viewCount;
+ } else if (DotProduct((( srfSurfaceFace_t * ) surf->data)->plane.normal, dir) > -0.5) {
+ // don't add faces that make sharp angles with the projection direction
+ surf->viewCount = tr.viewCount;
+ }
+ }
+ else if (*(surfaceType_t *) (surf->data) != SF_GRID &&
+ *(surfaceType_t *) (surf->data) != SF_TRIANGLES)
+ surf->viewCount = tr.viewCount;
+ // check the viewCount because the surface may have
+ // already been added if it spans multiple leafs
+ if (surf->viewCount != tr.viewCount) {
+ surf->viewCount = tr.viewCount;
+ list[*listlength] = (surfaceType_t *) surf->data;
+ (*listlength)++;
+ }
+ mark++;
+ }
+}
+
+/*
+=================
+R_AddMarkFragments
+
+=================
+*/
+void R_AddMarkFragments(int numClipPoints, vec3_t clipPoints[2][MAX_VERTS_ON_POLY],
+ int numPlanes, vec3_t *normals, float *dists,
+ int maxPoints, vec3_t pointBuffer,
+ int maxFragments, markFragment_t *fragmentBuffer,
+ int *returnedPoints, int *returnedFragments,
+ vec3_t mins, vec3_t maxs) {
+ int pingPong, i;
+ markFragment_t *mf;
+
+ // chop the surface by all the bounding planes of the to be projected polygon
+ pingPong = 0;
+
+ for ( i = 0 ; i < numPlanes ; i++ ) {
+
+ R_ChopPolyBehindPlane( numClipPoints, clipPoints[pingPong],
+ &numClipPoints, clipPoints[!pingPong],
+ normals[i], dists[i], 0.5 );
+ pingPong ^= 1;
+ if ( numClipPoints == 0 ) {
+ break;
+ }
+ }
+ // completely clipped away?
+ if ( numClipPoints == 0 ) {
+ return;
+ }
+
+ // add this fragment to the returned list
+ if ( numClipPoints + (*returnedPoints) > maxPoints ) {
+ return; // not enough space for this polygon
+ }
+ /*
+ // all the clip points should be within the bounding box
+ for ( i = 0 ; i < numClipPoints ; i++ ) {
+ int j;
+ for ( j = 0 ; j < 3 ; j++ ) {
+ if (clipPoints[pingPong][i][j] < mins[j] - 0.5) break;
+ if (clipPoints[pingPong][i][j] > maxs[j] + 0.5) break;
+ }
+ if (j < 3) break;
+ }
+ if (i < numClipPoints) return;
+ */
+
+ mf = fragmentBuffer + (*returnedFragments);
+ mf->firstPoint = (*returnedPoints);
+ mf->numPoints = numClipPoints;
+ Com_Memcpy( pointBuffer + (*returnedPoints) * 3, clipPoints[pingPong], numClipPoints * sizeof(vec3_t) );
+
+ (*returnedPoints) += numClipPoints;
+ (*returnedFragments)++;
+}
+
+/*
+=================
+R_MarkFragments
+
+=================
+*/
+int R_MarkFragments( int numPoints, const vec3_t *points, const vec3_t projection,
+ int maxPoints, vec3_t pointBuffer, int maxFragments, markFragment_t *fragmentBuffer ) {
+ int numsurfaces, numPlanes;
+ int i, j, k, m, n;
+ surfaceType_t *surfaces[64];
+ vec3_t mins, maxs;
+ int returnedFragments;
+ int returnedPoints;
+ vec3_t normals[MAX_VERTS_ON_POLY+2];
+ float dists[MAX_VERTS_ON_POLY+2];
+ vec3_t clipPoints[2][MAX_VERTS_ON_POLY];
+ int numClipPoints;
+ float *v;
+ srfGridMesh_t *cv;
+ drawVert_t *dv;
+ vec3_t normal;
+ vec3_t projectionDir;
+ vec3_t v1, v2;
+ int *indexes;
+
+ //increment view count for double check prevention
+ tr.viewCount++;
+
+ //
+ VectorNormalize2( projection, projectionDir );
+ // find all the brushes that are to be considered
+ ClearBounds( mins, maxs );
+ for ( i = 0 ; i < numPoints ; i++ ) {
+ vec3_t temp;
+
+ AddPointToBounds( points[i], mins, maxs );
+ VectorAdd( points[i], projection, temp );
+ AddPointToBounds( temp, mins, maxs );
+ // make sure we get all the leafs (also the one(s) in front of the hit surface)
+ VectorMA( points[i], -20, projectionDir, temp );
+ AddPointToBounds( temp, mins, maxs );
+ }
+
+ if (numPoints > MAX_VERTS_ON_POLY) numPoints = MAX_VERTS_ON_POLY;
+ // create the bounding planes for the to be projected polygon
+ for ( i = 0 ; i < numPoints ; i++ ) {
+ VectorSubtract(points[(i+1)%numPoints], points[i], v1);
+ VectorAdd(points[i], projection, v2);
+ VectorSubtract(points[i], v2, v2);
+ CrossProduct(v1, v2, normals[i]);
+ VectorNormalizeFast(normals[i]);
+ dists[i] = DotProduct(normals[i], points[i]);
+ }
+ // add near and far clipping planes for projection
+ VectorCopy(projectionDir, normals[numPoints]);
+ dists[numPoints] = DotProduct(normals[numPoints], points[0]) - 32;
+ VectorCopy(projectionDir, normals[numPoints+1]);
+ VectorInverse(normals[numPoints+1]);
+ dists[numPoints+1] = DotProduct(normals[numPoints+1], points[0]) - 20;
+ numPlanes = numPoints + 2;
+
+ numsurfaces = 0;
+ R_BoxSurfaces_r(tr.world->nodes, mins, maxs, surfaces, 64, &numsurfaces, projectionDir);
+ //assert(numsurfaces <= 64);
+ //assert(numsurfaces != 64);
+
+ returnedPoints = 0;
+ returnedFragments = 0;
+
+ for ( i = 0 ; i < numsurfaces ; i++ ) {
+
+ if (*surfaces[i] == SF_GRID) {
+
+ cv = (srfGridMesh_t *) surfaces[i];
+ for ( m = 0 ; m < cv->height - 1 ; m++ ) {
+ for ( n = 0 ; n < cv->width - 1 ; n++ ) {
+ // We triangulate the grid and chop all triangles within
+ // the bounding planes of the to be projected polygon.
+ // LOD is not taken into account, not such a big deal though.
+ //
+ // It's probably much nicer to chop the grid itself and deal
+ // with this grid as a normal SF_GRID surface so LOD will
+ // be applied. However the LOD of that chopped grid must
+ // be synced with the LOD of the original curve.
+ // One way to do this; the chopped grid shares vertices with
+ // the original curve. When LOD is applied to the original
+ // curve the unused vertices are flagged. Now the chopped curve
+ // should skip the flagged vertices. This still leaves the
+ // problems with the vertices at the chopped grid edges.
+ //
+ // To avoid issues when LOD applied to "hollow curves" (like
+ // the ones around many jump pads) we now just add a 2 unit
+ // offset to the triangle vertices.
+ // The offset is added in the vertex normal vector direction
+ // so all triangles will still fit together.
+ // The 2 unit offset should avoid pretty much all LOD problems.
+
+ numClipPoints = 3;
+
+ dv = cv->verts + m * cv->width + n;
+
+ VectorCopy(dv[0].xyz, clipPoints[0][0]);
+ VectorMA(clipPoints[0][0], MARKER_OFFSET, dv[0].normal, clipPoints[0][0]);
+ VectorCopy(dv[cv->width].xyz, clipPoints[0][1]);
+ VectorMA(clipPoints[0][1], MARKER_OFFSET, dv[cv->width].normal, clipPoints[0][1]);
+ VectorCopy(dv[1].xyz, clipPoints[0][2]);
+ VectorMA(clipPoints[0][2], MARKER_OFFSET, dv[1].normal, clipPoints[0][2]);
+ // check the normal of this triangle
+ VectorSubtract(clipPoints[0][0], clipPoints[0][1], v1);
+ VectorSubtract(clipPoints[0][2], clipPoints[0][1], v2);
+ CrossProduct(v1, v2, normal);
+ VectorNormalizeFast(normal);
+ if (DotProduct(normal, projectionDir) < -0.1) {
+ // add the fragments of this triangle
+ R_AddMarkFragments(numClipPoints, clipPoints,
+ numPlanes, normals, dists,
+ maxPoints, pointBuffer,
+ maxFragments, fragmentBuffer,
+ &returnedPoints, &returnedFragments, mins, maxs);
+
+ if ( returnedFragments == maxFragments ) {
+ return returnedFragments; // not enough space for more fragments
+ }
+ }
+
+ VectorCopy(dv[1].xyz, clipPoints[0][0]);
+ VectorMA(clipPoints[0][0], MARKER_OFFSET, dv[1].normal, clipPoints[0][0]);
+ VectorCopy(dv[cv->width].xyz, clipPoints[0][1]);
+ VectorMA(clipPoints[0][1], MARKER_OFFSET, dv[cv->width].normal, clipPoints[0][1]);
+ VectorCopy(dv[cv->width+1].xyz, clipPoints[0][2]);
+ VectorMA(clipPoints[0][2], MARKER_OFFSET, dv[cv->width+1].normal, clipPoints[0][2]);
+ // check the normal of this triangle
+ VectorSubtract(clipPoints[0][0], clipPoints[0][1], v1);
+ VectorSubtract(clipPoints[0][2], clipPoints[0][1], v2);
+ CrossProduct(v1, v2, normal);
+ VectorNormalizeFast(normal);
+ if (DotProduct(normal, projectionDir) < -0.05) {
+ // add the fragments of this triangle
+ R_AddMarkFragments(numClipPoints, clipPoints,
+ numPlanes, normals, dists,
+ maxPoints, pointBuffer,
+ maxFragments, fragmentBuffer,
+ &returnedPoints, &returnedFragments, mins, maxs);
+
+ if ( returnedFragments == maxFragments ) {
+ return returnedFragments; // not enough space for more fragments
+ }
+ }
+ }
+ }
+ }
+ else if (*surfaces[i] == SF_FACE) {
+
+ srfSurfaceFace_t *surf = ( srfSurfaceFace_t * ) surfaces[i];
+
+ // check the normal of this face
+ if (DotProduct(surf->plane.normal, projectionDir) > -0.5) {
+ continue;
+ }
+
+ indexes = (int *)( (byte *)surf + surf->ofsIndices );
+ for ( k = 0 ; k < surf->numIndices ; k += 3 ) {
+ for ( j = 0 ; j < 3 ; j++ ) {
+ v = surf->points[0] + VERTEXSIZE * indexes[k+j];;
+ VectorMA( v, MARKER_OFFSET, surf->plane.normal, clipPoints[0][j] );
+ }
+
+ // add the fragments of this face
+ R_AddMarkFragments( 3 , clipPoints,
+ numPlanes, normals, dists,
+ maxPoints, pointBuffer,
+ maxFragments, fragmentBuffer,
+ &returnedPoints, &returnedFragments, mins, maxs);
+ if ( returnedFragments == maxFragments ) {
+ return returnedFragments; // not enough space for more fragments
+ }
+ }
+ }
+ else if(*surfaces[i] == SF_TRIANGLES && r_marksOnTriangleMeshes->integer) {
+
+ srfTriangles_t *surf = (srfTriangles_t *) surfaces[i];
+
+ for (k = 0; k < surf->numIndexes; k += 3)
+ {
+ for(j = 0; j < 3; j++)
+ {
+ v = surf->verts[surf->indexes[k + j]].xyz;
+ VectorMA(v, MARKER_OFFSET, surf->verts[surf->indexes[k + j]].normal, clipPoints[0][j]);
+ }
+
+ // add the fragments of this face
+ R_AddMarkFragments(3, clipPoints,
+ numPlanes, normals, dists,
+ maxPoints, pointBuffer,
+ maxFragments, fragmentBuffer, &returnedPoints, &returnedFragments, mins, maxs);
+ if(returnedFragments == maxFragments)
+ {
+ return returnedFragments; // not enough space for more fragments
+ }
+ }
+ }
+ }
+ return returnedFragments;
+}
+
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