mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 21:02:50 +00:00
315 lines
7.9 KiB
C
315 lines
7.9 KiB
C
/*
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r_aclip.c
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clip routines for drawing Alias models directly to the screen
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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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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#include "QF/render.h"
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#include "d_local.h"
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#include "r_local.h"
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static finalvert_t fv[2][8];
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static auxvert_t av[8];
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/*
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R_Alias_clip_z
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pfv0 is the unclipped vertex, pfv1 is the z-clipped vertex
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*/
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static void
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R_Alias_clip_z (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
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{
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float scale;
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auxvert_t *pav0, *pav1, avout;
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pav0 = &av[pfv0 - &fv[0][0]];
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pav1 = &av[pfv1 - &fv[0][0]];
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if (pfv0->v[1] >= pfv1->v[1]) {
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scale = (ALIAS_Z_CLIP_PLANE - pav0->fv[2]) /
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(pav1->fv[2] - pav0->fv[2]);
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avout.fv[0] = pav0->fv[0] + (pav1->fv[0] - pav0->fv[0]) * scale;
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avout.fv[1] = pav0->fv[1] + (pav1->fv[1] - pav0->fv[1]) * scale;
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avout.fv[2] = ALIAS_Z_CLIP_PLANE;
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out->v[2] = pfv0->v[2] + (pfv1->v[2] - pfv0->v[2]) * scale;
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out->v[3] = pfv0->v[3] + (pfv1->v[3] - pfv0->v[3]) * scale;
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out->v[4] = pfv0->v[4] + (pfv1->v[4] - pfv0->v[4]) * scale;
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} else {
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scale = (ALIAS_Z_CLIP_PLANE - pav1->fv[2]) /
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(pav0->fv[2] - pav1->fv[2]);
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avout.fv[0] = pav1->fv[0] + (pav0->fv[0] - pav1->fv[0]) * scale;
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avout.fv[1] = pav1->fv[1] + (pav0->fv[1] - pav1->fv[1]) * scale;
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avout.fv[2] = ALIAS_Z_CLIP_PLANE;
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out->v[2] = pfv1->v[2] + (pfv0->v[2] - pfv1->v[2]) * scale;
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out->v[3] = pfv1->v[3] + (pfv0->v[3] - pfv1->v[3]) * scale;
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out->v[4] = pfv1->v[4] + (pfv0->v[4] - pfv1->v[4]) * scale;
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}
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R_AliasProjectFinalVert (out, &avout);
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if (out->v[0] < r_refdef.aliasvrect.x)
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out->flags |= ALIAS_LEFT_CLIP;
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if (out->v[1] < r_refdef.aliasvrect.y)
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out->flags |= ALIAS_TOP_CLIP;
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if (out->v[0] > r_refdef.aliasvrectright)
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out->flags |= ALIAS_RIGHT_CLIP;
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if (out->v[1] > r_refdef.aliasvrectbottom)
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out->flags |= ALIAS_BOTTOM_CLIP;
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}
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void
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R_Alias_clip_left (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
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{
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float scale;
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int i;
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if (pfv0->v[1] >= pfv1->v[1]) {
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scale = (float) (r_refdef.aliasvrect.x - pfv0->v[0]) /
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(pfv1->v[0] - pfv0->v[0]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
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} else {
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scale = (float) (r_refdef.aliasvrect.x - pfv1->v[0]) /
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(pfv0->v[0] - pfv1->v[0]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
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}
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}
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void
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R_Alias_clip_right (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
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{
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float scale;
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int i;
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if (pfv0->v[1] >= pfv1->v[1]) {
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scale = (float) (r_refdef.aliasvrectright - pfv0->v[0]) /
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(pfv1->v[0] - pfv0->v[0]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
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} else {
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scale = (float) (r_refdef.aliasvrectright - pfv1->v[0]) /
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(pfv0->v[0] - pfv1->v[0]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
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}
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}
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void
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R_Alias_clip_top (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
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{
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float scale;
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int i;
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if (pfv0->v[1] >= pfv1->v[1]) {
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scale = (float) (r_refdef.aliasvrect.y - pfv0->v[1]) /
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(pfv1->v[1] - pfv0->v[1]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
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} else {
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scale = (float) (r_refdef.aliasvrect.y - pfv1->v[1]) /
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(pfv0->v[1] - pfv1->v[1]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
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}
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}
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void
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R_Alias_clip_bottom (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
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{
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float scale;
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int i;
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if (pfv0->v[1] >= pfv1->v[1]) {
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scale = (float) (r_refdef.aliasvrectbottom - pfv0->v[1]) /
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(pfv1->v[1] - pfv0->v[1]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
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} else {
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scale = (float) (r_refdef.aliasvrectbottom - pfv1->v[1]) /
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(pfv0->v[1] - pfv1->v[1]);
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for (i = 0; i < 6; i++)
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out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
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}
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}
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static int
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R_AliasClip (finalvert_t *in, finalvert_t *out, int flag, int count,
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void (*clip) (finalvert_t *pfv0, finalvert_t *pfv1,
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finalvert_t *out))
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{
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int i, j, k;
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int flags, oldflags;
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j = count - 1;
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k = 0;
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for (i = 0; i < count; j = i, i++) {
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oldflags = in[j].flags & flag;
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flags = in[i].flags & flag;
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if (flags && oldflags)
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continue;
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if (oldflags ^ flags) {
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clip (&in[j], &in[i], &out[k]);
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out[k].flags = 0;
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if (out[k].v[0] < r_refdef.aliasvrect.x)
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out[k].flags |= ALIAS_LEFT_CLIP;
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if (out[k].v[1] < r_refdef.aliasvrect.y)
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out[k].flags |= ALIAS_TOP_CLIP;
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if (out[k].v[0] > r_refdef.aliasvrectright)
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out[k].flags |= ALIAS_RIGHT_CLIP;
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if (out[k].v[1] > r_refdef.aliasvrectbottom)
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out[k].flags |= ALIAS_BOTTOM_CLIP;
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k++;
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}
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if (!flags) {
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out[k] = in[i];
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k++;
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}
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}
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return k;
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}
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void
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R_AliasClipTriangle (mtriangle_t *ptri)
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{
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int i, k, pingpong;
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mtriangle_t mtri;
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unsigned int clipflags;
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// copy vertexes and fix seam texture coordinates
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if (ptri->facesfront) {
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fv[0][0] = pfinalverts[ptri->vertindex[0]];
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fv[0][1] = pfinalverts[ptri->vertindex[1]];
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fv[0][2] = pfinalverts[ptri->vertindex[2]];
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} else {
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for (i = 0; i < 3; i++) {
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fv[0][i] = pfinalverts[ptri->vertindex[i]];
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if (!ptri->facesfront && (fv[0][i].flags & ALIAS_ONSEAM))
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fv[0][i].v[2] += r_affinetridesc.seamfixupX16;
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}
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}
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// clip
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clipflags = fv[0][0].flags | fv[0][1].flags | fv[0][2].flags;
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if (clipflags & ALIAS_Z_CLIP) {
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for (i = 0; i < 3; i++)
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av[i] = pauxverts[ptri->vertindex[i]];
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k = R_AliasClip (fv[0], fv[1], ALIAS_Z_CLIP, 3, R_Alias_clip_z);
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if (k == 0)
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return;
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pingpong = 1;
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clipflags = fv[1][0].flags | fv[1][1].flags | fv[1][2].flags;
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} else {
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pingpong = 0;
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k = 3;
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}
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if (clipflags & ALIAS_LEFT_CLIP) {
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k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
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ALIAS_LEFT_CLIP, k, R_Alias_clip_left);
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if (k == 0)
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return;
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pingpong ^= 1;
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}
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if (clipflags & ALIAS_RIGHT_CLIP) {
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k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
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ALIAS_RIGHT_CLIP, k, R_Alias_clip_right);
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if (k == 0)
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return;
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pingpong ^= 1;
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}
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if (clipflags & ALIAS_BOTTOM_CLIP) {
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k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
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ALIAS_BOTTOM_CLIP, k, R_Alias_clip_bottom);
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if (k == 0)
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return;
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pingpong ^= 1;
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}
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if (clipflags & ALIAS_TOP_CLIP) {
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k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
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ALIAS_TOP_CLIP, k, R_Alias_clip_top);
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if (k == 0)
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return;
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pingpong ^= 1;
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}
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for (i = 0; i < k; i++) {
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if (fv[pingpong][i].v[0] < r_refdef.aliasvrect.x)
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fv[pingpong][i].v[0] = r_refdef.aliasvrect.x;
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else if (fv[pingpong][i].v[0] > r_refdef.aliasvrectright)
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fv[pingpong][i].v[0] = r_refdef.aliasvrectright;
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if (fv[pingpong][i].v[1] < r_refdef.aliasvrect.y)
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fv[pingpong][i].v[1] = r_refdef.aliasvrect.y;
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else if (fv[pingpong][i].v[1] > r_refdef.aliasvrectbottom)
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fv[pingpong][i].v[1] = r_refdef.aliasvrectbottom;
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fv[pingpong][i].flags = 0;
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}
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// draw triangles
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mtri.facesfront = ptri->facesfront;
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r_affinetridesc.ptriangles = &mtri;
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r_affinetridesc.pfinalverts = fv[pingpong];
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// FIXME: do all at once as trifan?
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mtri.vertindex[0] = 0;
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for (i = 1; i < k - 1; i++) {
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mtri.vertindex[1] = i;
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mtri.vertindex[2] = i + 1;
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D_PolysetDraw ();
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}
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}
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