mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-18 02:31:31 +00:00
318 lines
7.9 KiB
C
318 lines
7.9 KiB
C
/*
|
|
r_aclip.c
|
|
|
|
clip routines for drawing Alias models directly to the screen
|
|
|
|
Copyright (C) 1996-1997 Id Software, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to:
|
|
|
|
Free Software Foundation, Inc.
|
|
59 Temple Place - Suite 330
|
|
Boston, MA 02111-1307, USA
|
|
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
static __attribute__ ((used)) const char rcsid[] =
|
|
"$Id$";
|
|
|
|
#include "QF/render.h"
|
|
|
|
#include "d_local.h"
|
|
#include "r_internal.h"
|
|
|
|
static finalvert_t fv[2][8];
|
|
static auxvert_t av[8];
|
|
|
|
/*
|
|
R_Alias_clip_z
|
|
|
|
pfv0 is the unclipped vertex, pfv1 is the z-clipped vertex
|
|
*/
|
|
static void
|
|
R_Alias_clip_z (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
|
{
|
|
float scale;
|
|
auxvert_t *pav0, *pav1, avout;
|
|
|
|
pav0 = &av[pfv0 - &fv[0][0]];
|
|
pav1 = &av[pfv1 - &fv[0][0]];
|
|
|
|
if (pfv0->v[1] >= pfv1->v[1]) {
|
|
scale = (ALIAS_Z_CLIP_PLANE - pav0->fv[2]) /
|
|
(pav1->fv[2] - pav0->fv[2]);
|
|
|
|
avout.fv[0] = pav0->fv[0] + (pav1->fv[0] - pav0->fv[0]) * scale;
|
|
avout.fv[1] = pav0->fv[1] + (pav1->fv[1] - pav0->fv[1]) * scale;
|
|
avout.fv[2] = ALIAS_Z_CLIP_PLANE;
|
|
|
|
out->v[2] = pfv0->v[2] + (pfv1->v[2] - pfv0->v[2]) * scale;
|
|
out->v[3] = pfv0->v[3] + (pfv1->v[3] - pfv0->v[3]) * scale;
|
|
out->v[4] = pfv0->v[4] + (pfv1->v[4] - pfv0->v[4]) * scale;
|
|
} else {
|
|
scale = (ALIAS_Z_CLIP_PLANE - pav1->fv[2]) /
|
|
(pav0->fv[2] - pav1->fv[2]);
|
|
|
|
avout.fv[0] = pav1->fv[0] + (pav0->fv[0] - pav1->fv[0]) * scale;
|
|
avout.fv[1] = pav1->fv[1] + (pav0->fv[1] - pav1->fv[1]) * scale;
|
|
avout.fv[2] = ALIAS_Z_CLIP_PLANE;
|
|
|
|
out->v[2] = pfv1->v[2] + (pfv0->v[2] - pfv1->v[2]) * scale;
|
|
out->v[3] = pfv1->v[3] + (pfv0->v[3] - pfv1->v[3]) * scale;
|
|
out->v[4] = pfv1->v[4] + (pfv0->v[4] - pfv1->v[4]) * scale;
|
|
}
|
|
|
|
R_AliasProjectFinalVert (out, &avout);
|
|
|
|
if (out->v[0] < r_refdef.aliasvrect.x)
|
|
out->flags |= ALIAS_LEFT_CLIP;
|
|
if (out->v[1] < r_refdef.aliasvrect.y)
|
|
out->flags |= ALIAS_TOP_CLIP;
|
|
if (out->v[0] > r_refdef.aliasvrectright)
|
|
out->flags |= ALIAS_RIGHT_CLIP;
|
|
if (out->v[1] > r_refdef.aliasvrectbottom)
|
|
out->flags |= ALIAS_BOTTOM_CLIP;
|
|
}
|
|
|
|
#ifndef USE_INTEL_ASM
|
|
|
|
void
|
|
R_Alias_clip_left (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
|
{
|
|
float scale;
|
|
int i;
|
|
|
|
if (pfv0->v[1] >= pfv1->v[1]) {
|
|
scale = (float) (r_refdef.aliasvrect.x - pfv0->v[0]) /
|
|
(pfv1->v[0] - pfv0->v[0]);
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
|
|
} else {
|
|
scale = (float) (r_refdef.aliasvrect.x - pfv1->v[0]) /
|
|
(pfv0->v[0] - pfv1->v[0]);
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
R_Alias_clip_right (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
|
{
|
|
float scale;
|
|
int i;
|
|
|
|
if (pfv0->v[1] >= pfv1->v[1]) {
|
|
scale = (float) (r_refdef.aliasvrectright - pfv0->v[0]) /
|
|
(pfv1->v[0] - pfv0->v[0]);
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
|
|
} else {
|
|
scale = (float) (r_refdef.aliasvrectright - pfv1->v[0]) /
|
|
(pfv0->v[0] - pfv1->v[0]);
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
R_Alias_clip_top (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
|
{
|
|
float scale;
|
|
int i;
|
|
|
|
if (pfv0->v[1] >= pfv1->v[1]) {
|
|
scale = (float) (r_refdef.aliasvrect.y - pfv0->v[1]) /
|
|
(pfv1->v[1] - pfv0->v[1]);
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
|
|
} else {
|
|
scale = (float) (r_refdef.aliasvrect.y - pfv1->v[1]) /
|
|
(pfv0->v[1] - pfv1->v[1]);
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
R_Alias_clip_bottom (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
|
{
|
|
float scale;
|
|
int i;
|
|
|
|
if (pfv0->v[1] >= pfv1->v[1]) {
|
|
scale = (float) (r_refdef.aliasvrectbottom - pfv0->v[1]) /
|
|
(pfv1->v[1] - pfv0->v[1]);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i]) * scale + 0.5;
|
|
} else {
|
|
scale = (float) (r_refdef.aliasvrectbottom - pfv1->v[1]) /
|
|
(pfv0->v[1] - pfv1->v[1]);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i]) * scale + 0.5;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
static int
|
|
R_AliasClip (finalvert_t *in, finalvert_t *out, int flag, int count,
|
|
void (*clip) (finalvert_t *pfv0, finalvert_t *pfv1,
|
|
finalvert_t *out))
|
|
{
|
|
int i, j, k;
|
|
int flags, oldflags;
|
|
|
|
j = count - 1;
|
|
k = 0;
|
|
for (i = 0; i < count; j = i, i++) {
|
|
oldflags = in[j].flags & flag;
|
|
flags = in[i].flags & flag;
|
|
|
|
if (flags && oldflags)
|
|
continue;
|
|
if (oldflags ^ flags) {
|
|
clip (&in[j], &in[i], &out[k]);
|
|
out[k].flags = 0;
|
|
if (out[k].v[0] < r_refdef.aliasvrect.x)
|
|
out[k].flags |= ALIAS_LEFT_CLIP;
|
|
if (out[k].v[1] < r_refdef.aliasvrect.y)
|
|
out[k].flags |= ALIAS_TOP_CLIP;
|
|
if (out[k].v[0] > r_refdef.aliasvrectright)
|
|
out[k].flags |= ALIAS_RIGHT_CLIP;
|
|
if (out[k].v[1] > r_refdef.aliasvrectbottom)
|
|
out[k].flags |= ALIAS_BOTTOM_CLIP;
|
|
k++;
|
|
}
|
|
if (!flags) {
|
|
out[k] = in[i];
|
|
k++;
|
|
}
|
|
}
|
|
|
|
return k;
|
|
}
|
|
|
|
|
|
void
|
|
R_AliasClipTriangle (mtriangle_t *ptri)
|
|
{
|
|
int i, k, pingpong;
|
|
mtriangle_t mtri;
|
|
unsigned int clipflags;
|
|
|
|
// copy vertexes and fix seam texture coordinates
|
|
if (ptri->facesfront) {
|
|
fv[0][0] = pfinalverts[ptri->vertindex[0]];
|
|
fv[0][1] = pfinalverts[ptri->vertindex[1]];
|
|
fv[0][2] = pfinalverts[ptri->vertindex[2]];
|
|
} else {
|
|
for (i = 0; i < 3; i++) {
|
|
fv[0][i] = pfinalverts[ptri->vertindex[i]];
|
|
|
|
if (!ptri->facesfront && (fv[0][i].flags & ALIAS_ONSEAM))
|
|
fv[0][i].v[2] += r_affinetridesc.seamfixupX16;
|
|
}
|
|
}
|
|
|
|
// clip
|
|
clipflags = fv[0][0].flags | fv[0][1].flags | fv[0][2].flags;
|
|
|
|
if (clipflags & ALIAS_Z_CLIP) {
|
|
for (i = 0; i < 3; i++)
|
|
av[i] = pauxverts[ptri->vertindex[i]];
|
|
|
|
k = R_AliasClip (fv[0], fv[1], ALIAS_Z_CLIP, 3, R_Alias_clip_z);
|
|
if (k == 0)
|
|
return;
|
|
|
|
pingpong = 1;
|
|
clipflags = fv[1][0].flags | fv[1][1].flags | fv[1][2].flags;
|
|
} else {
|
|
pingpong = 0;
|
|
k = 3;
|
|
}
|
|
|
|
if (clipflags & ALIAS_LEFT_CLIP) {
|
|
k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
|
|
ALIAS_LEFT_CLIP, k, R_Alias_clip_left);
|
|
if (k == 0)
|
|
return;
|
|
|
|
pingpong ^= 1;
|
|
}
|
|
|
|
if (clipflags & ALIAS_RIGHT_CLIP) {
|
|
k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
|
|
ALIAS_RIGHT_CLIP, k, R_Alias_clip_right);
|
|
if (k == 0)
|
|
return;
|
|
|
|
pingpong ^= 1;
|
|
}
|
|
|
|
if (clipflags & ALIAS_BOTTOM_CLIP) {
|
|
k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
|
|
ALIAS_BOTTOM_CLIP, k, R_Alias_clip_bottom);
|
|
if (k == 0)
|
|
return;
|
|
|
|
pingpong ^= 1;
|
|
}
|
|
|
|
if (clipflags & ALIAS_TOP_CLIP) {
|
|
k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1],
|
|
ALIAS_TOP_CLIP, k, R_Alias_clip_top);
|
|
if (k == 0)
|
|
return;
|
|
|
|
pingpong ^= 1;
|
|
}
|
|
|
|
for (i = 0; i < k; i++) {
|
|
if (fv[pingpong][i].v[0] < r_refdef.aliasvrect.x)
|
|
fv[pingpong][i].v[0] = r_refdef.aliasvrect.x;
|
|
else if (fv[pingpong][i].v[0] > r_refdef.aliasvrectright)
|
|
fv[pingpong][i].v[0] = r_refdef.aliasvrectright;
|
|
|
|
if (fv[pingpong][i].v[1] < r_refdef.aliasvrect.y)
|
|
fv[pingpong][i].v[1] = r_refdef.aliasvrect.y;
|
|
else if (fv[pingpong][i].v[1] > r_refdef.aliasvrectbottom)
|
|
fv[pingpong][i].v[1] = r_refdef.aliasvrectbottom;
|
|
|
|
fv[pingpong][i].flags = 0;
|
|
}
|
|
|
|
// draw triangles
|
|
mtri.facesfront = ptri->facesfront;
|
|
r_affinetridesc.ptriangles = &mtri;
|
|
r_affinetridesc.pfinalverts = fv[pingpong];
|
|
|
|
// FIXME: do all at once as trifan?
|
|
mtri.vertindex[0] = 0;
|
|
for (i = 1; i < k - 1; i++) {
|
|
mtri.vertindex[1] = i;
|
|
mtri.vertindex[2] = i + 1;
|
|
D_PolysetDraw ();
|
|
}
|
|
}
|