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https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-16 01:42:01 +00:00
671 lines
15 KiB
C
671 lines
15 KiB
C
/*
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r_edge.c
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(description)
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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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$Id$
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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 "QF/sound.h"
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#include "d_ifacea.h"
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#include "r_local.h"
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#include "QF/render.h"
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#if 0
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FIXME
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the complex cases add new polys on most lines, so dont optimize for
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keeping them the same have multiple free span lists to try to get better
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coherence ? low depth complexity-- 1 to 3 or so this breaks spans at every
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edge, even hidden ones (bad)
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have a sentinal at both ends ?
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#endif
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edge_t *auxedges;
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edge_t *r_edges, *edge_p, *edge_max;
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surf_t *surfaces, *surface_p, *surf_max;
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// surfaces are generated in back to front order by the bsp, so if a surf
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// pointer is greater than another one, it should be drawn in front
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// surfaces[1] is the background, and is used as the active surface stack
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edge_t *newedges[MAXHEIGHT];
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edge_t *removeedges[MAXHEIGHT];
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espan_t *span_p, *max_span_p;
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int r_currentkey;
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extern int screenwidth;
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int current_iv;
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int edge_head_u_shift20, edge_tail_u_shift20;
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static void (*pdrawfunc) (void);
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edge_t edge_head;
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edge_t edge_tail;
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edge_t edge_aftertail;
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edge_t edge_sentinel;
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float fv;
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void R_GenerateSpans (void);
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void R_GenerateSpansBackward (void);
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void R_LeadingEdge (edge_t *edge);
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void R_LeadingEdgeBackwards (edge_t *edge);
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void R_TrailingEdge (surf_t *surf, edge_t *edge);
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void
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R_DrawCulledPolys (void)
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{
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surf_t *s;
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msurface_t *pface;
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currententity = &r_worldentity;
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if (r_worldpolysbacktofront) {
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for (s = surface_p - 1; s > &surfaces[1]; s--) {
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if (!s->spans)
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continue;
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if (!(s->flags & SURF_DRAWBACKGROUND)) {
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pface = (msurface_t *) s->data;
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R_RenderPoly (pface, 15);
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}
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}
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} else {
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for (s = &surfaces[1]; s < surface_p; s++) {
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if (!s->spans)
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continue;
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if (!(s->flags & SURF_DRAWBACKGROUND)) {
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pface = (msurface_t *) s->data;
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R_RenderPoly (pface, 15);
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}
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}
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}
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}
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void
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R_BeginEdgeFrame (void)
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{
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int v;
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edge_p = r_edges;
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edge_max = &r_edges[r_numallocatededges];
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surface_p = &surfaces[2]; // background is surface 1,
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// surface 0 is a dummy
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surfaces[1].spans = NULL; // no background spans yet
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surfaces[1].flags = SURF_DRAWBACKGROUND;
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// put the background behind everything in the world
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pdrawfunc = R_GenerateSpans;
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surfaces[1].key = 0x7FFFFFFF;
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r_currentkey = 0;
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// FIXME: set with memset
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for (v = r_refdef.vrect.y; v < r_refdef.vrectbottom; v++) {
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newedges[v] = removeedges[v] = NULL;
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}
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}
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#ifndef USE_INTEL_ASM
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/*
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R_InsertNewEdges
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Adds the edges in the linked list edgestoadd, adding them to the edges
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in the linked list edgelist. edgestoadd is assumed to be sorted on u,
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and non-empty (this is actually newedges[v]). edgelist is assumed to
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be sorted on u, with a sentinel at the end (actually, this is the
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active edge table starting at edge_head.next).
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*/
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void
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R_InsertNewEdges (edge_t *edgestoadd, edge_t *edgelist)
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{
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edge_t *next_edge;
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do {
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next_edge = edgestoadd->next;
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edgesearch:
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist = edgelist->next;
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist = edgelist->next;
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist = edgelist->next;
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist = edgelist->next;
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goto edgesearch;
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// insert edgestoadd before edgelist
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addedge:
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edgestoadd->next = edgelist;
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edgestoadd->prev = edgelist->prev;
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edgelist->prev->next = edgestoadd;
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edgelist->prev = edgestoadd;
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} while ((edgestoadd = next_edge) != NULL);
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}
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void
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R_RemoveEdges (edge_t *pedge)
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{
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do {
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pedge->next->prev = pedge->prev;
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pedge->prev->next = pedge->next;
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} while ((pedge = pedge->nextremove) != NULL);
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}
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void
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R_StepActiveU (edge_t *pedge)
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{
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edge_t *pnext_edge, *pwedge;
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while (1) {
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nextedge:
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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goto nextedge;
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pushback:
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if (pedge == &edge_aftertail)
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return;
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// push it back to keep it sorted
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pnext_edge = pedge->next;
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// pull the edge out of the edge list
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pedge->next->prev = pedge->prev;
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pedge->prev->next = pedge->next;
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// find out where the edge goes in the edge list
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pwedge = pedge->prev->prev;
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while (pwedge->u > pedge->u) {
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pwedge = pwedge->prev;
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}
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// put the edge back into the edge list
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pedge->next = pwedge->next;
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pedge->prev = pwedge;
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pedge->next->prev = pedge;
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pwedge->next = pedge;
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pedge = pnext_edge;
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if (pedge == &edge_tail)
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return;
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}
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}
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#endif // !USE_INTEL_ASM
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void
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R_CleanupSpan (void)
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{
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surf_t *surf;
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int iu;
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espan_t *span;
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// now that we've reached the right edge of the screen, we're done with any
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// unfinished surfaces, so emit a span for whatever's on top
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surf = surfaces[1].next;
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iu = edge_tail_u_shift20;
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if (iu > surf->last_u) {
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span = span_p++;
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span->u = surf->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf->spans;
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surf->spans = span;
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}
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// reset spanstate for all surfaces in the surface stack
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do {
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surf->spanstate = 0;
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surf = surf->next;
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} while (surf != &surfaces[1]);
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}
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void
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R_LeadingEdgeBackwards (edge_t *edge)
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{
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espan_t *span;
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surf_t *surf, *surf2;
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int iu;
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// it's adding a new surface in, so find the correct place
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surf = &surfaces[edge->surfs[1]];
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// don't start a span if this is an inverted span, with the end
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// edge preceding the start edge (that is, we've already seen the
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// end edge)
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if (++surf->spanstate == 1) {
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surf2 = surfaces[1].next;
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if (surf->key > surf2->key)
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goto newtop;
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (surf->insubmodel && (surf->key == surf2->key)) {
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// must be two bmodels in the same leaf; don't care, because
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// they'll never be farthest anyway
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goto newtop;
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}
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continue_search:
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do {
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surf2 = surf2->next;
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} while (surf->key < surf2->key);
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if (surf->key == surf2->key) {
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (!surf->insubmodel)
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goto continue_search;
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// must be two bmodels in the same leaf; don't care which is
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// really in front, because they'll never be farthest anyway
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}
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goto gotposition;
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newtop:
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// emit a span (obscures current top)
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iu = edge->u >> 20;
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if (iu > surf2->last_u) {
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span = span_p++;
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span->u = surf2->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf2->spans;
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surf2->spans = span;
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}
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// set last_u on the new span
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surf->last_u = iu;
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gotposition:
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// insert before surf2
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surf->next = surf2;
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surf->prev = surf2->prev;
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surf2->prev->next = surf;
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surf2->prev = surf;
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}
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}
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void
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R_TrailingEdge (surf_t *surf, edge_t *edge)
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{
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espan_t *span;
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int iu;
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// don't generate a span if this is an inverted span, with the end edge
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// preceding the start edge (that is, we haven't seen the start edge yet)
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if (--surf->spanstate == 0) {
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if (surf->insubmodel)
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r_bmodelactive--;
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if (surf == surfaces[1].next) {
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// emit a span (current top going away)
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iu = edge->u >> 20;
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if (iu > surf->last_u) {
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span = span_p++;
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span->u = surf->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf->spans;
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surf->spans = span;
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}
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// set last_u on the surface below
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surf->next->last_u = iu;
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}
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surf->prev->next = surf->next;
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surf->next->prev = surf->prev;
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}
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}
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#ifndef USE_INTEL_ASM
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void
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R_LeadingEdge (edge_t *edge)
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{
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espan_t *span;
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surf_t *surf, *surf2;
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int iu;
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double fu, newzi, testzi, newzitop, newzibottom;
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if (edge->surfs[1]) {
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// it's adding a new surface in, so find the correct place
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surf = &surfaces[edge->surfs[1]];
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// don't start a span if this is an inverted span, with the end
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// edge preceding the start edge (that is, we've already seen the
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// end edge)
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if (++surf->spanstate == 1) {
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if (surf->insubmodel)
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r_bmodelactive++;
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surf2 = surfaces[1].next;
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if (surf->key < surf2->key)
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goto newtop;
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (surf->insubmodel && (surf->key == surf2->key)) {
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// must be two bmodels in the same leaf; sort on 1/z
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fu = (float) (edge->u - 0xFFFFF) * (1.0 / 0x100000);
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newzi = surf->d_ziorigin + fv * surf->d_zistepv +
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fu * surf->d_zistepu;
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newzibottom = newzi * 0.99;
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testzi = surf2->d_ziorigin + fv * surf2->d_zistepv +
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fu * surf2->d_zistepu;
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if (newzibottom >= testzi) {
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goto newtop;
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}
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newzitop = newzi * 1.01;
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if (newzitop >= testzi) {
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if (surf->d_zistepu >= surf2->d_zistepu) {
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goto newtop;
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}
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}
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}
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continue_search:
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do {
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surf2 = surf2->next;
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} while (surf->key > surf2->key);
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if (surf->key == surf2->key) {
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// if it's two surfaces on the same plane, the one that's
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// already active is in front, so keep going unless it's a
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// bmodel
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if (!surf->insubmodel)
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goto continue_search;
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// must be two bmodels in the same leaf; sort on 1/z
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fu = (float) (edge->u - 0xFFFFF) * (1.0 / 0x100000);
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newzi = surf->d_ziorigin + fv * surf->d_zistepv +
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fu * surf->d_zistepu;
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newzibottom = newzi * 0.99;
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testzi = surf2->d_ziorigin + fv * surf2->d_zistepv +
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fu * surf2->d_zistepu;
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if (newzibottom >= testzi) {
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goto gotposition;
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}
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newzitop = newzi * 1.01;
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if (newzitop >= testzi) {
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if (surf->d_zistepu >= surf2->d_zistepu) {
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goto gotposition;
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}
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}
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goto continue_search;
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}
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goto gotposition;
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newtop:
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// emit a span (obscures current top)
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iu = edge->u >> 20;
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if (iu > surf2->last_u) {
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span = span_p++;
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span->u = surf2->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf2->spans;
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surf2->spans = span;
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}
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// set last_u on the new span
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surf->last_u = iu;
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gotposition:
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// insert before surf2
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surf->next = surf2;
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surf->prev = surf2->prev;
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surf2->prev->next = surf;
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surf2->prev = surf;
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}
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}
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}
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void
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R_GenerateSpans (void)
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{
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edge_t *edge;
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surf_t *surf;
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r_bmodelactive = 0;
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// clear active surfaces to just the background surface
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surfaces[1].next = surfaces[1].prev = &surfaces[1];
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surfaces[1].last_u = edge_head_u_shift20;
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// generate spans
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for (edge = edge_head.next; edge != &edge_tail; edge = edge->next) {
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if (edge->surfs[0]) {
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// it has a left surface, so a surface is going away for this span
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surf = &surfaces[edge->surfs[0]];
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R_TrailingEdge (surf, edge);
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if (!edge->surfs[1])
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continue;
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}
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R_LeadingEdge (edge);
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}
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R_CleanupSpan ();
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}
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#endif // !USE_INTEL_ASM
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void
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R_GenerateSpansBackward (void)
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{
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edge_t *edge;
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r_bmodelactive = 0;
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// clear active surfaces to just the background surface
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surfaces[1].next = surfaces[1].prev = &surfaces[1];
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surfaces[1].last_u = edge_head_u_shift20;
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// generate spans
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for (edge = edge_head.next; edge != &edge_tail; edge = edge->next) {
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if (edge->surfs[0])
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R_TrailingEdge (&surfaces[edge->surfs[0]], edge);
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if (edge->surfs[1])
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R_LeadingEdgeBackwards (edge);
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}
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R_CleanupSpan ();
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}
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/*
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R_ScanEdges
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Input:
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newedges[] array
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this has links to edges, which have links to surfaces
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Output:
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Each surface has a linked list of its visible spans
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*/
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void
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R_ScanEdges (void)
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{
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int iv, bottom;
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byte basespans[MAXSPANS * sizeof (espan_t) + CACHE_SIZE];
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espan_t *basespan_p;
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surf_t *s;
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basespan_p = (espan_t *)
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((long) (basespans + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
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max_span_p = &basespan_p[MAXSPANS - r_refdef.vrect.width];
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span_p = basespan_p;
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// clear active edges to just the background edges around the whole screen
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// FIXME: most of this only needs to be set up once
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edge_head.u = r_refdef.vrect.x << 20;
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edge_head_u_shift20 = edge_head.u >> 20;
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edge_head.u_step = 0;
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edge_head.prev = NULL;
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edge_head.next = &edge_tail;
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edge_head.surfs[0] = 0;
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edge_head.surfs[1] = 1;
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edge_tail.u = (r_refdef.vrectright << 20) + 0xFFFFF;
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edge_tail_u_shift20 = edge_tail.u >> 20;
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edge_tail.u_step = 0;
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edge_tail.prev = &edge_head;
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edge_tail.next = &edge_aftertail;
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edge_tail.surfs[0] = 1;
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edge_tail.surfs[1] = 0;
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edge_aftertail.u = -1; // force a move
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edge_aftertail.u_step = 0;
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edge_aftertail.next = &edge_sentinel;
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edge_aftertail.prev = &edge_tail;
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// FIXME: do we need this now that we clamp x in r_draw.c?
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edge_sentinel.u = 2000 << 24; // make sure nothing sorts past this
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edge_sentinel.prev = &edge_aftertail;
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// process all scan lines
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bottom = r_refdef.vrectbottom - 1;
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for (iv = r_refdef.vrect.y; iv < bottom; iv++) {
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current_iv = iv;
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fv = (float) iv;
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// mark that the head (background start) span is pre-included
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surfaces[1].spanstate = 1;
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if (newedges[iv]) {
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R_InsertNewEdges (newedges[iv], edge_head.next);
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}
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(*pdrawfunc) ();
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// flush the span list if we can't be sure we have enough spans left
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// for the next scan
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if (span_p > max_span_p) {
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VID_UnlockBuffer ();
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S_ExtraUpdate (); // don't let sound get messed up if going slow
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VID_LockBuffer ();
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if (r_drawculledpolys)
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R_DrawCulledPolys ();
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else
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D_DrawSurfaces ();
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// clear the surface span pointers
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for (s = &surfaces[1]; s < surface_p; s++)
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s->spans = NULL;
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span_p = basespan_p;
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}
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if (removeedges[iv])
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R_RemoveEdges (removeedges[iv]);
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if (edge_head.next != &edge_tail)
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R_StepActiveU (edge_head.next);
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}
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// do the last scan (no need to step or sort or remove on the last scan)
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current_iv = iv;
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fv = (float) iv;
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// mark that the head (background start) span is pre-included
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surfaces[1].spanstate = 1;
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if (newedges[iv])
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R_InsertNewEdges (newedges[iv], edge_head.next);
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(*pdrawfunc) ();
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// draw whatever's left in the span list
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if (r_drawculledpolys)
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R_DrawCulledPolys ();
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else
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D_DrawSurfaces ();
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}
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