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https://git.code.sf.net/p/quake/quakeforge
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d25f39cc7d
It's never used after being set.
674 lines
17 KiB
C
674 lines
17 KiB
C
/*
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sw_ralias.c
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routines for setting up to draw alias models
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include "QF/image.h"
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#include "QF/render.h"
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#include "QF/skin.h"
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#include "QF/sys.h"
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#include "d_ifacea.h"
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#include "r_internal.h"
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#define LIGHT_MIN 5 // lowest light value we'll allow, to
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// avoid the need for inner-loop light
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// clamping
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affinetridesc_t r_affinetridesc;
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void *acolormap; // FIXME: should go away
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trivertx_t *r_apverts;
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// TODO: these probably will go away with optimized rasterization
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static mdl_t *pmdl;
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vec3_t r_plightvec;
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int r_ambientlight;
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float r_shadelight;
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static aliashdr_t *paliashdr;
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finalvert_t *pfinalverts;
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auxvert_t *pauxverts;
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float ziscale;
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static model_t *pmodel;
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static vec3_t alias_forward, alias_right, alias_up;
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static maliasskindesc_t *pskindesc;
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int r_amodels_drawn;
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int a_skinwidth;
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int r_anumverts;
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float aliastransform[3][4];
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typedef struct {
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int index0;
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int index1;
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} aedge_t;
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static aedge_t aedges[12] = {
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{0, 1}, {1, 2}, {2, 3}, {3, 0},
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{4, 5}, {5, 6}, {6, 7}, {7, 4},
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{0, 5}, {1, 4}, {2, 7}, {3, 6}
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};
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qboolean
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R_AliasCheckBBox (void)
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{
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int i, flags, frame, numv;
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aliashdr_t *pahdr;
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float zi, basepts[8][3], v0, v1, frac;
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finalvert_t *pv0, *pv1, viewpts[16];
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auxvert_t *pa0, *pa1, viewaux[16];
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maliasframedesc_t *pframedesc;
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qboolean zclipped, zfullyclipped;
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unsigned int anyclip, allclip;
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int minz;
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// expand, rotate, and translate points into worldspace
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currententity->trivial_accept = 0;
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pmodel = currententity->model;
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if (!(pahdr = pmodel->aliashdr))
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pahdr = Cache_Get (&pmodel->cache);
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pmdl = (mdl_t *) ((byte *) pahdr + pahdr->model);
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R_AliasSetUpTransform (0);
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// construct the base bounding box for this frame
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frame = currententity->frame;
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// TODO: don't repeat this check when drawing?
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if ((frame >= pmdl->numframes) || (frame < 0)) {
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Sys_MaskPrintf (SYS_DEV, "No such frame %d %s\n", frame, pmodel->name);
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frame = 0;
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}
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pframedesc = &pahdr->frames[frame];
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// x worldspace coordinates
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basepts[0][0] = basepts[1][0] = basepts[2][0] = basepts[3][0] =
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(float) pframedesc->bboxmin.v[0];
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basepts[4][0] = basepts[5][0] = basepts[6][0] = basepts[7][0] =
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(float) pframedesc->bboxmax.v[0];
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// y worldspace coordinates
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basepts[0][1] = basepts[3][1] = basepts[5][1] = basepts[6][1] =
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(float) pframedesc->bboxmin.v[1];
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basepts[1][1] = basepts[2][1] = basepts[4][1] = basepts[7][1] =
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(float) pframedesc->bboxmax.v[1];
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// z worldspace coordinates
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basepts[0][2] = basepts[1][2] = basepts[4][2] = basepts[5][2] =
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(float) pframedesc->bboxmin.v[2];
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basepts[2][2] = basepts[3][2] = basepts[6][2] = basepts[7][2] =
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(float) pframedesc->bboxmax.v[2];
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zclipped = false;
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zfullyclipped = true;
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minz = 9999;
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for (i = 0; i < 8; i++) {
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R_AliasTransformVector (&basepts[i][0], &viewaux[i].fv[0]);
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if (viewaux[i].fv[2] < ALIAS_Z_CLIP_PLANE) {
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// we must clip points that are closer than the near clip plane
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viewpts[i].flags = ALIAS_Z_CLIP;
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zclipped = true;
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} else {
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if (viewaux[i].fv[2] < minz)
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minz = viewaux[i].fv[2];
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viewpts[i].flags = 0;
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zfullyclipped = false;
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}
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}
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if (zfullyclipped) {
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if (!pmodel->aliashdr)
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Cache_Release (&pmodel->cache);
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return false; // everything was near-z-clipped
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}
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numv = 8;
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if (zclipped) {
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// organize points by edges, use edges to get new points (possible
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// trivial reject)
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for (i = 0; i < 12; i++) {
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// edge endpoints
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pv0 = &viewpts[aedges[i].index0];
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pv1 = &viewpts[aedges[i].index1];
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pa0 = &viewaux[aedges[i].index0];
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pa1 = &viewaux[aedges[i].index1];
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// if one end is clipped and the other isn't, make a new point
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if (pv0->flags ^ pv1->flags) {
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frac = (ALIAS_Z_CLIP_PLANE - pa0->fv[2]) /
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(pa1->fv[2] - pa0->fv[2]);
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viewaux[numv].fv[0] = pa0->fv[0] +
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(pa1->fv[0] - pa0->fv[0]) * frac;
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viewaux[numv].fv[1] = pa0->fv[1] +
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(pa1->fv[1] - pa0->fv[1]) * frac;
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viewaux[numv].fv[2] = ALIAS_Z_CLIP_PLANE;
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viewpts[numv].flags = 0;
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numv++;
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}
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}
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}
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// project the vertices that remain after clipping
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anyclip = 0;
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allclip = ALIAS_XY_CLIP_MASK;
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// TODO: probably should do this loop in ASM, especially if we use floats
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for (i = 0; i < numv; i++) {
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// we don't need to bother with vertices that were z-clipped
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if (viewpts[i].flags & ALIAS_Z_CLIP)
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continue;
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zi = 1.0 / viewaux[i].fv[2];
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// FIXME: do with chop mode in ASM, or convert to float
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v0 = (viewaux[i].fv[0] * xscale * zi) + xcenter;
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v1 = (viewaux[i].fv[1] * yscale * zi) + ycenter;
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flags = 0;
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if (v0 < r_refdef.fvrectx)
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flags |= ALIAS_LEFT_CLIP;
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if (v1 < r_refdef.fvrecty)
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flags |= ALIAS_TOP_CLIP;
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if (v0 > r_refdef.fvrectright)
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flags |= ALIAS_RIGHT_CLIP;
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if (v1 > r_refdef.fvrectbottom)
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flags |= ALIAS_BOTTOM_CLIP;
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anyclip |= flags;
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allclip &= flags;
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}
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if (allclip) {
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if (!pmodel->aliashdr)
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Cache_Release (&pmodel->cache);
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return false; // trivial reject off one side
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}
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currententity->trivial_accept = !anyclip & !zclipped;
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if (currententity->trivial_accept) {
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if (minz > (r_aliastransition + (pmdl->size * r_resfudge))) {
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currententity->trivial_accept |= 2;
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}
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}
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if (!pmodel->aliashdr)
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Cache_Release (&pmodel->cache);
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return true;
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}
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void
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R_AliasTransformVector (vec3_t in, vec3_t out)
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{
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out[0] = DotProduct (in, aliastransform[0]) + aliastransform[0][3];
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out[1] = DotProduct (in, aliastransform[1]) + aliastransform[1][3];
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out[2] = DotProduct (in, aliastransform[2]) + aliastransform[2][3];
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}
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void
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R_AliasClipAndProjectFinalVert (finalvert_t *fv, auxvert_t *av)
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{
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if (av->fv[2] < ALIAS_Z_CLIP_PLANE) {
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fv->flags |= ALIAS_Z_CLIP;
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return;
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}
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R_AliasProjectFinalVert (fv, av);
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if (fv->v[0] < r_refdef.aliasvrect.x)
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fv->flags |= ALIAS_LEFT_CLIP;
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if (fv->v[1] < r_refdef.aliasvrect.y)
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fv->flags |= ALIAS_TOP_CLIP;
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if (fv->v[0] > r_refdef.aliasvrectright)
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fv->flags |= ALIAS_RIGHT_CLIP;
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if (fv->v[1] > r_refdef.aliasvrectbottom)
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fv->flags |= ALIAS_BOTTOM_CLIP;
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}
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static void
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R_AliasTransformFinalVert16 (auxvert_t *av, trivertx_t *pverts)
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{
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trivertx_t * pextra;
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float vextra[3];
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pextra = pverts + pmdl->numverts;
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vextra[0] = pverts->v[0] + pextra->v[0] / (float)256;
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vextra[1] = pverts->v[1] + pextra->v[1] / (float)256;
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vextra[2] = pverts->v[2] + pextra->v[2] / (float)256;
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av->fv[0] = DotProduct (vextra, aliastransform[0]) +
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aliastransform[0][3];
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av->fv[1] = DotProduct (vextra, aliastransform[1]) +
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aliastransform[1][3];
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av->fv[2] = DotProduct (vextra, aliastransform[2]) +
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aliastransform[2][3];
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}
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static void
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R_AliasTransformFinalVert8 (auxvert_t *av, trivertx_t *pverts)
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{
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av->fv[0] = DotProduct (pverts->v, aliastransform[0]) +
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aliastransform[0][3];
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av->fv[1] = DotProduct (pverts->v, aliastransform[1]) +
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aliastransform[1][3];
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av->fv[2] = DotProduct (pverts->v, aliastransform[2]) +
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aliastransform[2][3];
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}
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/*
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R_AliasPreparePoints
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General clipped case
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*/
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static void
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R_AliasPreparePoints (void)
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{
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int i;
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stvert_t *pstverts;
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finalvert_t *fv;
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auxvert_t *av;
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mtriangle_t *ptri;
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finalvert_t *pfv[3];
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pstverts = (stvert_t *) ((byte *) paliashdr + paliashdr->stverts);
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r_anumverts = pmdl->numverts;
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fv = pfinalverts;
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av = pauxverts;
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if (pmdl->ident == HEADER_MDL16) {
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for (i = 0; i < r_anumverts; i++, fv++, av++, r_apverts++,
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pstverts++) {
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R_AliasTransformFinalVert16 (av, r_apverts);
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R_AliasTransformFinalVert (fv, r_apverts, pstverts);
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R_AliasClipAndProjectFinalVert (fv, av);
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}
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} else {
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for (i = 0; i < r_anumverts; i++, fv++, av++, r_apverts++,
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pstverts++) {
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R_AliasTransformFinalVert8 (av, r_apverts);
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R_AliasTransformFinalVert (fv, r_apverts, pstverts);
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R_AliasClipAndProjectFinalVert (fv, av);
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}
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}
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// clip and draw all triangles
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r_affinetridesc.numtriangles = 1;
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ptri = (mtriangle_t *) ((byte *) paliashdr + paliashdr->triangles);
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for (i = 0; i < pmdl->numtris; i++, ptri++) {
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pfv[0] = &pfinalverts[ptri->vertindex[0]];
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pfv[1] = &pfinalverts[ptri->vertindex[1]];
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pfv[2] = &pfinalverts[ptri->vertindex[2]];
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if (pfv[0]->flags & pfv[1]->flags & pfv[2]->flags
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& (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP))
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continue; // completely clipped
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if (!((pfv[0]->flags | pfv[1]->flags | pfv[2]->flags)
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& (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP))) { // totally unclipped
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r_affinetridesc.pfinalverts = pfinalverts;
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r_affinetridesc.ptriangles = ptri;
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D_PolysetDraw ();
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} else { // partially clipped
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R_AliasClipTriangle (ptri);
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}
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}
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}
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void
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R_AliasSetUpTransform (int trivial_accept)
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{
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int i;
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float rotationmatrix[3][4], t2matrix[3][4];
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static float tmatrix[3][4];
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static float viewmatrix[3][4];
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VectorCopy (currententity->transform + 0, alias_forward);
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VectorNegate (currententity->transform + 4, alias_right);
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VectorCopy (currententity->transform + 8, alias_up);
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tmatrix[0][0] = pmdl->scale[0];
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tmatrix[1][1] = pmdl->scale[1];
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tmatrix[2][2] = pmdl->scale[2];
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tmatrix[0][3] = pmdl->scale_origin[0];
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tmatrix[1][3] = pmdl->scale_origin[1];
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tmatrix[2][3] = pmdl->scale_origin[2];
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// TODO: can do this with simple matrix rearrangement
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for (i = 0; i < 3; i++) {
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t2matrix[i][0] = alias_forward[i];
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t2matrix[i][1] = -alias_right[i];
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t2matrix[i][2] = alias_up[i];
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}
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t2matrix[0][3] = -modelorg[0];
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t2matrix[1][3] = -modelorg[1];
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t2matrix[2][3] = -modelorg[2];
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// FIXME: can do more efficiently than full concatenation
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R_ConcatTransforms (t2matrix, tmatrix, rotationmatrix);
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// TODO: should be global, set when vright, etc., set
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VectorCopy (vright, viewmatrix[0]);
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VectorCopy (vup, viewmatrix[1]);
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VectorNegate (viewmatrix[1], viewmatrix[1]);
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VectorCopy (vpn, viewmatrix[2]);
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// viewmatrix[0][3] = 0;
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// viewmatrix[1][3] = 0;
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// viewmatrix[2][3] = 0;
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R_ConcatTransforms (viewmatrix, rotationmatrix, aliastransform);
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// do the scaling up of x and y to screen coordinates as part of the transform
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// for the unclipped case (it would mess up clipping in the clipped case).
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// Also scale down z, so 1/z is scaled 31 bits for free, and scale down x and y
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// correspondingly so the projected x and y come out right
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// FIXME: make this work for clipped case too?
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if (trivial_accept && pmdl->ident != HEADER_MDL16) {
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for (i = 0; i < 4; i++) {
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aliastransform[0][i] *= aliasxscale *
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(1.0 / ((float) 0x8000 * 0x10000));
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aliastransform[1][i] *= aliasyscale *
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(1.0 / ((float) 0x8000 * 0x10000));
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aliastransform[2][i] *= 1.0 / ((float) 0x8000 * 0x10000);
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}
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}
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}
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/*
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R_AliasTransformFinalVert
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now this function just copies the texture coordinates and calculates
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lighting actual 3D transform is done by R_AliasTransformFinalVert8/16
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functions above */
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void
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R_AliasTransformFinalVert (finalvert_t *fv, trivertx_t *pverts,
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stvert_t *pstverts)
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{
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int temp;
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float lightcos, *plightnormal;
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fv->v[2] = pstverts->s;
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fv->v[3] = pstverts->t;
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fv->flags = pstverts->onseam;
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// lighting
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plightnormal = r_avertexnormals[pverts->lightnormalindex];
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lightcos = DotProduct (plightnormal, r_plightvec);
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temp = r_ambientlight;
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if (lightcos < 0) {
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temp += (int) (r_shadelight * lightcos);
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// clamp; because we limited the minimum ambient and shading light,
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// we don't have to clamp low light, just bright
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if (temp < 0)
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temp = 0;
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}
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fv->v[4] = temp;
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}
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#ifdef PIC
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#undef USE_INTEL_ASM //XXX asm pic hack
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#endif
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#ifndef USE_INTEL_ASM
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void
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R_AliasTransformAndProjectFinalVerts (finalvert_t *fv, stvert_t *pstverts)
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{
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int i, temp;
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float lightcos, *plightnormal, zi;
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trivertx_t *pverts;
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pverts = r_apverts;
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for (i = 0; i < r_anumverts; i++, fv++, pverts++, pstverts++) {
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// transform and project
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zi = 1.0 / (DotProduct (pverts->v, aliastransform[2]) +
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aliastransform[2][3]);
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// x, y, and z are scaled down by 1/2**31 in the transform, so 1/z is
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// scaled up by 1/2**31, and the scaling cancels out for x and y in
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// the projection
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fv->v[5] = zi;
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fv->v[0] = ((DotProduct (pverts->v, aliastransform[0]) +
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aliastransform[0][3]) * zi) + aliasxcenter;
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fv->v[1] = ((DotProduct (pverts->v, aliastransform[1]) +
|
|
aliastransform[1][3]) * zi) + aliasycenter;
|
|
|
|
fv->v[2] = pstverts->s;
|
|
fv->v[3] = pstverts->t;
|
|
fv->flags = pstverts->onseam;
|
|
|
|
// lighting
|
|
plightnormal = r_avertexnormals[pverts->lightnormalindex];
|
|
lightcos = DotProduct (plightnormal, r_plightvec);
|
|
temp = r_ambientlight;
|
|
|
|
if (lightcos < 0) {
|
|
temp += (int) (r_shadelight * lightcos);
|
|
|
|
// clamp; because we limited the minimum ambient and shading
|
|
// light, we don't have to clamp low light, just bright
|
|
if (temp < 0)
|
|
temp = 0;
|
|
}
|
|
|
|
fv->v[4] = temp;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void
|
|
R_AliasProjectFinalVert (finalvert_t *fv, auxvert_t *av)
|
|
{
|
|
float zi;
|
|
|
|
// project points
|
|
zi = 1.0 / av->fv[2];
|
|
|
|
fv->v[5] = zi * ziscale;
|
|
|
|
fv->v[0] = (av->fv[0] * aliasxscale * zi) + aliasxcenter;
|
|
fv->v[1] = (av->fv[1] * aliasyscale * zi) + aliasycenter;
|
|
}
|
|
|
|
static void
|
|
R_AliasPrepareUnclippedPoints (void)
|
|
{
|
|
stvert_t *pstverts;
|
|
finalvert_t *fv;
|
|
|
|
pstverts = (stvert_t *) ((byte *) paliashdr + paliashdr->stverts);
|
|
r_anumverts = pmdl->numverts;
|
|
// FIXME: just use pfinalverts directly?
|
|
fv = pfinalverts;
|
|
|
|
R_AliasTransformAndProjectFinalVerts (fv, pstverts);
|
|
|
|
if (r_affinetridesc.drawtype)
|
|
D_PolysetDrawFinalVerts (fv, r_anumverts);
|
|
|
|
r_affinetridesc.pfinalverts = pfinalverts;
|
|
r_affinetridesc.ptriangles = (mtriangle_t *)
|
|
((byte *) paliashdr + paliashdr->triangles);
|
|
r_affinetridesc.numtriangles = pmdl->numtris;
|
|
|
|
D_PolysetDraw ();
|
|
}
|
|
|
|
static void
|
|
R_AliasSetupSkin (void)
|
|
{
|
|
int skinnum;
|
|
|
|
skinnum = currententity->skinnum;
|
|
if ((skinnum >= pmdl->numskins) || (skinnum < 0)) {
|
|
Sys_MaskPrintf (SYS_DEV, "R_AliasSetupSkin: no such skin # %d\n",
|
|
skinnum);
|
|
skinnum = 0;
|
|
}
|
|
|
|
pskindesc = R_AliasGetSkindesc (skinnum, paliashdr);
|
|
|
|
a_skinwidth = pmdl->skinwidth;
|
|
|
|
r_affinetridesc.pskin = (void *) ((byte *) paliashdr + pskindesc->skin);
|
|
r_affinetridesc.skinwidth = a_skinwidth;
|
|
r_affinetridesc.seamfixupX16 = (a_skinwidth >> 1) << 16;
|
|
r_affinetridesc.skinheight = pmdl->skinheight;
|
|
|
|
acolormap = vid.colormap8;
|
|
if (currententity->skin) {
|
|
tex_t *base;
|
|
|
|
base = currententity->skin->texels;
|
|
if (base) {
|
|
r_affinetridesc.pskin = base->data;
|
|
r_affinetridesc.skinwidth = base->width;
|
|
r_affinetridesc.skinheight = base->height;
|
|
}
|
|
acolormap = currententity->skin->colormap;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
R_AliasSetupLighting (alight_t *plighting)
|
|
{
|
|
// guarantee that no vertex will ever be lit below LIGHT_MIN, so we don't
|
|
// have to clamp off the bottom
|
|
r_ambientlight = plighting->ambientlight;
|
|
|
|
if (r_ambientlight < LIGHT_MIN)
|
|
r_ambientlight = LIGHT_MIN;
|
|
|
|
r_ambientlight = (255 - r_ambientlight) << VID_CBITS;
|
|
|
|
if (r_ambientlight < LIGHT_MIN)
|
|
r_ambientlight = LIGHT_MIN;
|
|
|
|
r_shadelight = plighting->shadelight;
|
|
|
|
if (r_shadelight < 0)
|
|
r_shadelight = 0;
|
|
|
|
r_shadelight *= VID_GRADES;
|
|
|
|
// rotate the lighting vector into the model's frame of reference
|
|
r_plightvec[0] = DotProduct (plighting->plightvec, alias_forward);
|
|
r_plightvec[1] = -DotProduct (plighting->plightvec, alias_right);
|
|
r_plightvec[2] = DotProduct (plighting->plightvec, alias_up);
|
|
}
|
|
|
|
/*
|
|
R_AliasSetupFrame
|
|
|
|
set r_apverts
|
|
*/
|
|
static void
|
|
R_AliasSetupFrame (void)
|
|
{
|
|
maliasframedesc_t *frame;
|
|
|
|
frame = R_AliasGetFramedesc (currententity->frame, paliashdr);
|
|
r_apverts = (trivertx_t *) ((byte *) paliashdr + frame->frame);
|
|
}
|
|
|
|
|
|
void
|
|
R_AliasDrawModel (alight_t *plighting)
|
|
{
|
|
int size;
|
|
finalvert_t *finalverts;
|
|
|
|
r_amodels_drawn++;
|
|
|
|
if (!(paliashdr = currententity->model->aliashdr))
|
|
paliashdr = Cache_Get (¤tentity->model->cache);
|
|
pmdl = (mdl_t *) ((byte *) paliashdr + paliashdr->model);
|
|
|
|
size = (CACHE_SIZE - 1)
|
|
+ sizeof (finalvert_t) * (pmdl->numverts + 1)
|
|
+ sizeof (auxvert_t) * pmdl->numverts;
|
|
finalverts = (finalvert_t *) Hunk_TempAlloc (size);
|
|
if (!finalverts)
|
|
Sys_Error ("R_AliasDrawModel: out of memory");
|
|
|
|
// cache align
|
|
pfinalverts = (finalvert_t *)
|
|
(((intptr_t) &finalverts[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
|
|
pauxverts = (auxvert_t *) &pfinalverts[pmdl->numverts + 1];
|
|
|
|
R_AliasSetupSkin ();
|
|
R_AliasSetUpTransform (currententity->trivial_accept);
|
|
R_AliasSetupLighting (plighting);
|
|
R_AliasSetupFrame ();
|
|
|
|
r_affinetridesc.drawtype = (currententity->trivial_accept == 3) &&
|
|
r_recursiveaffinetriangles;
|
|
|
|
if (!acolormap)
|
|
acolormap = vid.colormap8;
|
|
|
|
if (r_affinetridesc.drawtype) {
|
|
D_PolysetUpdateTables (); // FIXME: precalc...
|
|
} else {
|
|
#ifdef USE_INTEL_ASM
|
|
D_Aff8Patch (acolormap);
|
|
#endif
|
|
}
|
|
|
|
if (currententity != vr_data.view_model)
|
|
ziscale = (float) 0x8000 *(float) 0x10000;
|
|
else
|
|
ziscale = (float) 0x8000 *(float) 0x10000 *3.0;
|
|
|
|
if (currententity->trivial_accept && pmdl->ident != HEADER_MDL16)
|
|
R_AliasPrepareUnclippedPoints ();
|
|
else
|
|
R_AliasPreparePoints ();
|
|
|
|
if (!currententity->model->aliashdr)
|
|
Cache_Release (¤tentity->model->cache);
|
|
}
|