675 lines
14 KiB
C
675 lines
14 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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.
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See the 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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// r_bsp.c
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#include "quakedef.h"
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#include "r_local.h"
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//
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// current entity info
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//
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qboolean insubmodel;
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entity_t *currententity;
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vec3_t modelorg, base_modelorg;
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// modelorg is the viewpoint reletive to
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// the currently rendering entity
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vec3_t r_entorigin; // the currently rendering entity in world
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// coordinates
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float entity_rotation[3][3];
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vec3_t r_worldmodelorg;
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int r_currentbkey;
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typedef enum {touchessolid, drawnode, nodrawnode} solidstate_t;
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#define MAX_BMODEL_VERTS 500 // 6K
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#define MAX_BMODEL_EDGES 1000 // 12K
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static mvertex_t *pbverts;
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static bedge_t *pbedges;
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static int numbverts, numbedges;
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static mvertex_t *pfrontenter, *pfrontexit;
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static qboolean makeclippededge;
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//===========================================================================
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/*
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================
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R_EntityRotate
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================
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*/
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void R_EntityRotate (vec3_t vec)
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{
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vec3_t tvec;
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VectorCopy (vec, tvec);
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vec[0] = DotProduct (entity_rotation[0], tvec);
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vec[1] = DotProduct (entity_rotation[1], tvec);
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vec[2] = DotProduct (entity_rotation[2], tvec);
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}
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/*
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================
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R_RotateBmodel
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================
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*/
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void R_RotateBmodel (void)
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{
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float angle, s, c, temp1[3][3], temp2[3][3], temp3[3][3];
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// TODO: should use a look-up table
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// TODO: should really be stored with the entity instead of being reconstructed
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// TODO: could cache lazily, stored in the entity
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// TODO: share work with R_SetUpAliasTransform
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// yaw
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angle = currententity->angles[YAW];
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angle = angle * M_PI*2 / 360;
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s = sin(angle);
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c = cos(angle);
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temp1[0][0] = c;
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temp1[0][1] = s;
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temp1[0][2] = 0;
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temp1[1][0] = -s;
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temp1[1][1] = c;
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temp1[1][2] = 0;
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temp1[2][0] = 0;
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temp1[2][1] = 0;
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temp1[2][2] = 1;
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// pitch
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angle = currententity->angles[PITCH];
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angle = angle * M_PI*2 / 360;
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s = sin(angle);
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c = cos(angle);
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temp2[0][0] = c;
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temp2[0][1] = 0;
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temp2[0][2] = -s;
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temp2[1][0] = 0;
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temp2[1][1] = 1;
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temp2[1][2] = 0;
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temp2[2][0] = s;
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temp2[2][1] = 0;
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temp2[2][2] = c;
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R_ConcatRotations (temp2, temp1, temp3);
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// roll
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angle = currententity->angles[ROLL];
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angle = angle * M_PI*2 / 360;
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s = sin(angle);
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c = cos(angle);
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temp1[0][0] = 1;
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temp1[0][1] = 0;
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temp1[0][2] = 0;
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temp1[1][0] = 0;
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temp1[1][1] = c;
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temp1[1][2] = s;
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temp1[2][0] = 0;
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temp1[2][1] = -s;
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temp1[2][2] = c;
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R_ConcatRotations (temp1, temp3, entity_rotation);
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//
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// rotate modelorg and the transformation matrix
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//
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R_EntityRotate (modelorg);
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R_EntityRotate (vpn);
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R_EntityRotate (vright);
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R_EntityRotate (vup);
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R_TransformFrustum ();
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}
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/*
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================
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R_RecursiveClipBPoly
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================
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*/
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void R_RecursiveClipBPoly (bedge_t *pedges, mnode_t *pnode, msurface_t *psurf)
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{
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bedge_t *psideedges[2], *pnextedge, *ptedge;
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int i, side, lastside;
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float dist, frac, lastdist;
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mplane_t *splitplane, tplane;
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mvertex_t *pvert, *plastvert, *ptvert;
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mnode_t *pn;
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psideedges[0] = psideedges[1] = NULL;
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makeclippededge = false;
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// transform the BSP plane into model space
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// FIXME: cache these?
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splitplane = pnode->plane;
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tplane.dist = splitplane->dist -
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DotProduct(r_entorigin, splitplane->normal);
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tplane.normal[0] = DotProduct (entity_rotation[0], splitplane->normal);
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tplane.normal[1] = DotProduct (entity_rotation[1], splitplane->normal);
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tplane.normal[2] = DotProduct (entity_rotation[2], splitplane->normal);
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// clip edges to BSP plane
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for ( ; pedges ; pedges = pnextedge)
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{
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pnextedge = pedges->pnext;
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// set the status for the last point as the previous point
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// FIXME: cache this stuff somehow?
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plastvert = pedges->v[0];
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lastdist = DotProduct (plastvert->position, tplane.normal) -
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tplane.dist;
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if (lastdist > 0)
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lastside = 0;
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else
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lastside = 1;
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pvert = pedges->v[1];
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dist = DotProduct (pvert->position, tplane.normal) - tplane.dist;
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if (dist > 0)
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side = 0;
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else
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side = 1;
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if (side != lastside)
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{
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// clipped
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if (numbverts >= MAX_BMODEL_VERTS)
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return;
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// generate the clipped vertex
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frac = lastdist / (lastdist - dist);
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ptvert = &pbverts[numbverts++];
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ptvert->position[0] = plastvert->position[0] +
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frac * (pvert->position[0] -
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plastvert->position[0]);
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ptvert->position[1] = plastvert->position[1] +
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frac * (pvert->position[1] -
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plastvert->position[1]);
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ptvert->position[2] = plastvert->position[2] +
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frac * (pvert->position[2] -
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plastvert->position[2]);
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// split into two edges, one on each side, and remember entering
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// and exiting points
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// FIXME: share the clip edge by having a winding direction flag?
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if (numbedges >= (MAX_BMODEL_EDGES - 1))
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{
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Con_Printf ("Out of edges for bmodel\n");
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return;
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}
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ptedge = &pbedges[numbedges];
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ptedge->pnext = psideedges[lastside];
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psideedges[lastside] = ptedge;
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ptedge->v[0] = plastvert;
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ptedge->v[1] = ptvert;
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ptedge = &pbedges[numbedges + 1];
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ptedge->pnext = psideedges[side];
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psideedges[side] = ptedge;
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ptedge->v[0] = ptvert;
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ptedge->v[1] = pvert;
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numbedges += 2;
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if (side == 0)
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{
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// entering for front, exiting for back
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pfrontenter = ptvert;
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makeclippededge = true;
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}
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else
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{
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pfrontexit = ptvert;
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makeclippededge = true;
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}
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}
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else
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{
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// add the edge to the appropriate side
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pedges->pnext = psideedges[side];
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psideedges[side] = pedges;
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}
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}
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// if anything was clipped, reconstitute and add the edges along the clip
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// plane to both sides (but in opposite directions)
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if (makeclippededge)
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{
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if (numbedges >= (MAX_BMODEL_EDGES - 2))
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{
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Con_Printf ("Out of edges for bmodel\n");
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return;
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}
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ptedge = &pbedges[numbedges];
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ptedge->pnext = psideedges[0];
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psideedges[0] = ptedge;
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ptedge->v[0] = pfrontexit;
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ptedge->v[1] = pfrontenter;
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ptedge = &pbedges[numbedges + 1];
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ptedge->pnext = psideedges[1];
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psideedges[1] = ptedge;
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ptedge->v[0] = pfrontenter;
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ptedge->v[1] = pfrontexit;
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numbedges += 2;
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}
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// draw or recurse further
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for (i=0 ; i<2 ; i++)
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{
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if (psideedges[i])
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{
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// draw if we've reached a non-solid leaf, done if all that's left is a
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// solid leaf, and continue down the tree if it's not a leaf
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pn = pnode->children[i];
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// we're done with this branch if the node or leaf isn't in the PVS
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if (pn->visframe == r_visframecount)
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{
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if (pn->contents < 0)
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{
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if (pn->contents != CONTENTS_SOLID)
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{
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r_currentbkey = ((mleaf_t *)pn)->key;
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R_RenderBmodelFace (psideedges[i], psurf);
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}
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}
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else
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{
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R_RecursiveClipBPoly (psideedges[i], pnode->children[i],
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psurf);
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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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R_DrawSolidClippedSubmodelPolygons
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================
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*/
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void R_DrawSolidClippedSubmodelPolygons (model_t *pmodel)
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{
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int i, j, lindex;
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vec_t dot;
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msurface_t *psurf;
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int numsurfaces;
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mplane_t *pplane;
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mvertex_t bverts[MAX_BMODEL_VERTS];
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bedge_t bedges[MAX_BMODEL_EDGES], *pbedge;
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medge_t *pedge, *pedges;
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// FIXME: use bounding-box-based frustum clipping info?
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psurf = &pmodel->surfaces[pmodel->firstmodelsurface];
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numsurfaces = pmodel->nummodelsurfaces;
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pedges = pmodel->edges;
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for (i=0 ; i<numsurfaces ; i++, psurf++)
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{
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// find which side of the node we are on
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pplane = psurf->plane;
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dot = DotProduct (modelorg, pplane->normal) - pplane->dist;
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// draw the polygon
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if (((psurf->flags & SURF_PLANEBACK) && (dot < -BACKFACE_EPSILON)) ||
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(!(psurf->flags & SURF_PLANEBACK) && (dot > BACKFACE_EPSILON)))
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{
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// FIXME: use bounding-box-based frustum clipping info?
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// copy the edges to bedges, flipping if necessary so always
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// clockwise winding
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// FIXME: if edges and vertices get caches, these assignments must move
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// outside the loop, and overflow checking must be done here
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pbverts = bverts;
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pbedges = bedges;
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numbverts = numbedges = 0;
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if (psurf->numedges > 0)
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{
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pbedge = &bedges[numbedges];
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numbedges += psurf->numedges;
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for (j=0 ; j<psurf->numedges ; j++)
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{
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lindex = pmodel->surfedges[psurf->firstedge+j];
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if (lindex > 0)
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{
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pedge = &pedges[lindex];
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pbedge[j].v[0] = &r_pcurrentvertbase[pedge->v[0]];
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pbedge[j].v[1] = &r_pcurrentvertbase[pedge->v[1]];
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}
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else
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{
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lindex = -lindex;
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pedge = &pedges[lindex];
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pbedge[j].v[0] = &r_pcurrentvertbase[pedge->v[1]];
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pbedge[j].v[1] = &r_pcurrentvertbase[pedge->v[0]];
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}
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pbedge[j].pnext = &pbedge[j+1];
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}
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pbedge[j-1].pnext = NULL; // mark end of edges
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R_RecursiveClipBPoly (pbedge, currententity->topnode, psurf);
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}
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else
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{
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Sys_Error ("no edges in bmodel");
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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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R_DrawSubmodelPolygons
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================
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*/
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void R_DrawSubmodelPolygons (model_t *pmodel, int clipflags)
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{
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int i;
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vec_t dot;
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msurface_t *psurf;
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int numsurfaces;
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mplane_t *pplane;
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// FIXME: use bounding-box-based frustum clipping info?
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psurf = &pmodel->surfaces[pmodel->firstmodelsurface];
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numsurfaces = pmodel->nummodelsurfaces;
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for (i=0 ; i<numsurfaces ; i++, psurf++)
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{
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// find which side of the node we are on
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pplane = psurf->plane;
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dot = DotProduct (modelorg, pplane->normal) - pplane->dist;
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// draw the polygon
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if (((psurf->flags & SURF_PLANEBACK) && (dot < -BACKFACE_EPSILON)) ||
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(!(psurf->flags & SURF_PLANEBACK) && (dot > BACKFACE_EPSILON)))
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{
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r_currentkey = ((mleaf_t *)currententity->topnode)->key;
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// FIXME: use bounding-box-based frustum clipping info?
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R_RenderFace (psurf, clipflags);
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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_RecursiveWorldNode
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================
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*/
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void R_RecursiveWorldNode (mnode_t *node, int clipflags)
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{
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int i, c, side, *pindex;
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vec3_t acceptpt, rejectpt;
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mplane_t *plane;
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msurface_t *surf, **mark;
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mleaf_t *pleaf;
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double d, dot;
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if (node->contents == CONTENTS_SOLID)
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return; // solid
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if (node->visframe != r_visframecount)
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return;
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// cull the clipping planes if not trivial accept
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// FIXME: the compiler is doing a lousy job of optimizing here; it could be
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// twice as fast in ASM
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if (clipflags)
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{
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for (i=0 ; i<4 ; i++)
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{
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if (! (clipflags & (1<<i)) )
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continue; // don't need to clip against it
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// generate accept and reject points
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// FIXME: do with fast look-ups or integer tests based on the sign bit
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// of the floating point values
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pindex = pfrustum_indexes[i];
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rejectpt[0] = (float)node->minmaxs[pindex[0]];
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rejectpt[1] = (float)node->minmaxs[pindex[1]];
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rejectpt[2] = (float)node->minmaxs[pindex[2]];
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d = DotProduct (rejectpt, view_clipplanes[i].normal);
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d -= view_clipplanes[i].dist;
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if (d <= 0)
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return;
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acceptpt[0] = (float)node->minmaxs[pindex[3+0]];
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acceptpt[1] = (float)node->minmaxs[pindex[3+1]];
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acceptpt[2] = (float)node->minmaxs[pindex[3+2]];
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d = DotProduct (acceptpt, view_clipplanes[i].normal);
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d -= view_clipplanes[i].dist;
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if (d >= 0)
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clipflags &= ~(1<<i); // node is entirely on screen
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}
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}
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// if a leaf node, draw stuff
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if (node->contents < 0)
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{
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pleaf = (mleaf_t *)node;
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mark = pleaf->firstmarksurface;
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c = pleaf->nummarksurfaces;
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if (c)
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{
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do
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{
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(*mark)->visframe = r_framecount;
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mark++;
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} while (--c);
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}
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// deal with model fragments in this leaf
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if (pleaf->efrags)
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{
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R_StoreEfrags (&pleaf->efrags);
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}
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pleaf->key = r_currentkey;
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r_currentkey++; // all bmodels in a leaf share the same key
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}
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else
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{
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// node is just a decision point, so go down the apropriate sides
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// find which side of the node we are on
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plane = node->plane;
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switch (plane->type)
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{
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case PLANE_X:
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dot = modelorg[0] - plane->dist;
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break;
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case PLANE_Y:
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dot = modelorg[1] - plane->dist;
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break;
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case PLANE_Z:
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dot = modelorg[2] - plane->dist;
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break;
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default:
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dot = DotProduct (modelorg, plane->normal) - plane->dist;
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break;
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}
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if (dot >= 0)
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side = 0;
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|
else
|
|
side = 1;
|
|
|
|
// recurse down the children, front side first
|
|
R_RecursiveWorldNode (node->children[side], clipflags);
|
|
|
|
// draw stuff
|
|
c = node->numsurfaces;
|
|
|
|
if (c)
|
|
{
|
|
surf = cl.worldmodel->surfaces + node->firstsurface;
|
|
|
|
if (dot < -BACKFACE_EPSILON)
|
|
{
|
|
do
|
|
{
|
|
if ((surf->flags & SURF_PLANEBACK) &&
|
|
(surf->visframe == r_framecount))
|
|
{
|
|
if (r_drawpolys)
|
|
{
|
|
if (r_worldpolysbacktofront)
|
|
{
|
|
if (numbtofpolys < MAX_BTOFPOLYS)
|
|
{
|
|
pbtofpolys[numbtofpolys].clipflags =
|
|
clipflags;
|
|
pbtofpolys[numbtofpolys].psurf = surf;
|
|
numbtofpolys++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
R_RenderPoly (surf, clipflags);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
R_RenderFace (surf, clipflags);
|
|
}
|
|
}
|
|
|
|
surf++;
|
|
} while (--c);
|
|
}
|
|
else if (dot > BACKFACE_EPSILON)
|
|
{
|
|
do
|
|
{
|
|
if (!(surf->flags & SURF_PLANEBACK) &&
|
|
(surf->visframe == r_framecount))
|
|
{
|
|
if (r_drawpolys)
|
|
{
|
|
if (r_worldpolysbacktofront)
|
|
{
|
|
if (numbtofpolys < MAX_BTOFPOLYS)
|
|
{
|
|
pbtofpolys[numbtofpolys].clipflags =
|
|
clipflags;
|
|
pbtofpolys[numbtofpolys].psurf = surf;
|
|
numbtofpolys++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
R_RenderPoly (surf, clipflags);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
R_RenderFace (surf, clipflags);
|
|
}
|
|
}
|
|
|
|
surf++;
|
|
} while (--c);
|
|
}
|
|
|
|
// all surfaces on the same node share the same sequence number
|
|
r_currentkey++;
|
|
}
|
|
|
|
// recurse down the back side
|
|
R_RecursiveWorldNode (node->children[!side], clipflags);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
================
|
|
R_RenderWorld
|
|
================
|
|
*/
|
|
void R_RenderWorld (void)
|
|
{
|
|
int i;
|
|
model_t *clmodel;
|
|
btofpoly_t btofpolys[MAX_BTOFPOLYS];
|
|
|
|
pbtofpolys = btofpolys;
|
|
|
|
currententity = &cl_entities[0];
|
|
VectorCopy (r_origin, modelorg);
|
|
clmodel = currententity->model;
|
|
r_pcurrentvertbase = clmodel->vertexes;
|
|
|
|
R_RecursiveWorldNode (clmodel->nodes, 15);
|
|
|
|
// if the driver wants the polygons back to front, play the visible ones back
|
|
// in that order
|
|
if (r_worldpolysbacktofront)
|
|
{
|
|
for (i=numbtofpolys-1 ; i>=0 ; i--)
|
|
{
|
|
R_RenderPoly (btofpolys[i].psurf, btofpolys[i].clipflags);
|
|
}
|
|
}
|
|
}
|
|
|
|
|