mirror of
https://github.com/WinampDesktop/winamp.git
synced 2025-06-10 11:59:58 -05:00
Quack 3
This commit is contained in:
Literally A Penguin
committed by
GitHub
GitHub
parent
e8bd66b89c
commit
0bf99969fd
323
ref_soft/r_aclip.c
Normal file
323
ref_soft/r_aclip.c
Normal file
@@ -0,0 +1,323 @@
|
||||
/*
|
||||
Copyright (C) 1997-2001 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 the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||||
|
||||
*/
|
||||
// r_aclip.c: clip routines for drawing Alias models directly to the screen
|
||||
|
||||
#include "r_local.h"
|
||||
|
||||
static finalvert_t fv[2][8];
|
||||
|
||||
void R_AliasProjectAndClipTestFinalVert (finalvert_t *fv);
|
||||
void R_Alias_clip_top (finalvert_t *pfv0, finalvert_t *pfv1,
|
||||
finalvert_t *out);
|
||||
void R_Alias_clip_bottom (finalvert_t *pfv0, finalvert_t *pfv1,
|
||||
finalvert_t *out);
|
||||
void R_Alias_clip_left (finalvert_t *pfv0, finalvert_t *pfv1,
|
||||
finalvert_t *out);
|
||||
void R_Alias_clip_right (finalvert_t *pfv0, finalvert_t *pfv1,
|
||||
finalvert_t *out);
|
||||
|
||||
|
||||
/*
|
||||
================
|
||||
R_Alias_clip_z
|
||||
|
||||
pfv0 is the unclipped vertex, pfv1 is the z-clipped vertex
|
||||
================
|
||||
*/
|
||||
void R_Alias_clip_z (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
||||
{
|
||||
float scale;
|
||||
|
||||
scale = (ALIAS_Z_CLIP_PLANE - pfv0->xyz[2]) /
|
||||
(pfv1->xyz[2] - pfv0->xyz[2]);
|
||||
|
||||
out->xyz[0] = pfv0->xyz[0] + (pfv1->xyz[0] - pfv0->xyz[0]) * scale;
|
||||
out->xyz[1] = pfv0->xyz[1] + (pfv1->xyz[1] - pfv0->xyz[1]) * scale;
|
||||
out->xyz[2] = ALIAS_Z_CLIP_PLANE;
|
||||
|
||||
out->s = pfv0->s + (pfv1->s - pfv0->s) * scale;
|
||||
out->t = pfv0->t + (pfv1->t - pfv0->t) * scale;
|
||||
out->l = pfv0->l + (pfv1->l - pfv0->l) * scale;
|
||||
|
||||
R_AliasProjectAndClipTestFinalVert (out);
|
||||
}
|
||||
|
||||
|
||||
#if !id386
|
||||
|
||||
void R_Alias_clip_left (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
||||
{
|
||||
float scale;
|
||||
|
||||
if (pfv0->v >= pfv1->v )
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrect.x - pfv0->u) /
|
||||
(pfv1->u - pfv0->u);
|
||||
out->u = pfv0->u + ( pfv1->u - pfv0->u ) * scale + 0.5;
|
||||
out->v = pfv0->v + ( pfv1->v - pfv0->v ) * scale + 0.5;
|
||||
out->s = pfv0->s + ( pfv1->s - pfv0->s ) * scale + 0.5;
|
||||
out->t = pfv0->t + ( pfv1->t - pfv0->t ) * scale + 0.5;
|
||||
out->l = pfv0->l + ( pfv1->l - pfv0->l ) * scale + 0.5;
|
||||
out->zi = pfv0->zi + ( pfv1->zi - pfv0->zi) * scale + 0.5;
|
||||
}
|
||||
else
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrect.x - pfv1->u) /
|
||||
(pfv0->u - pfv1->u);
|
||||
out->u = pfv1->u + ( pfv0->u - pfv1->u ) * scale + 0.5;
|
||||
out->v = pfv1->v + ( pfv0->v - pfv1->v ) * scale + 0.5;
|
||||
out->s = pfv1->s + ( pfv0->s - pfv1->s ) * scale + 0.5;
|
||||
out->t = pfv1->t + ( pfv0->t - pfv1->t ) * scale + 0.5;
|
||||
out->l = pfv1->l + ( pfv0->l - pfv1->l ) * scale + 0.5;
|
||||
out->zi = pfv1->zi + ( pfv0->zi - pfv1->zi) * scale + 0.5;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void R_Alias_clip_right (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
||||
{
|
||||
float scale;
|
||||
|
||||
if ( pfv0->v >= pfv1->v )
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrectright - pfv0->u ) /
|
||||
(pfv1->u - pfv0->u );
|
||||
out->u = pfv0->u + ( pfv1->u - pfv0->u ) * scale + 0.5;
|
||||
out->v = pfv0->v + ( pfv1->v - pfv0->v ) * scale + 0.5;
|
||||
out->s = pfv0->s + ( pfv1->s - pfv0->s ) * scale + 0.5;
|
||||
out->t = pfv0->t + ( pfv1->t - pfv0->t ) * scale + 0.5;
|
||||
out->l = pfv0->l + ( pfv1->l - pfv0->l ) * scale + 0.5;
|
||||
out->zi = pfv0->zi + ( pfv1->zi - pfv0->zi) * scale + 0.5;
|
||||
}
|
||||
else
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrectright - pfv1->u ) /
|
||||
(pfv0->u - pfv1->u );
|
||||
out->u = pfv1->u + ( pfv0->u - pfv1->u ) * scale + 0.5;
|
||||
out->v = pfv1->v + ( pfv0->v - pfv1->v ) * scale + 0.5;
|
||||
out->s = pfv1->s + ( pfv0->s - pfv1->s ) * scale + 0.5;
|
||||
out->t = pfv1->t + ( pfv0->t - pfv1->t ) * scale + 0.5;
|
||||
out->l = pfv1->l + ( pfv0->l - pfv1->l ) * scale + 0.5;
|
||||
out->zi = pfv1->zi + ( pfv0->zi - pfv1->zi) * scale + 0.5;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void R_Alias_clip_top (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
|
||||
{
|
||||
float scale;
|
||||
|
||||
if (pfv0->v >= pfv1->v)
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrect.y - pfv0->v) /
|
||||
(pfv1->v - pfv0->v);
|
||||
out->u = pfv0->u + ( pfv1->u - pfv0->u ) * scale + 0.5;
|
||||
out->v = pfv0->v + ( pfv1->v - pfv0->v ) * scale + 0.5;
|
||||
out->s = pfv0->s + ( pfv1->s - pfv0->s ) * scale + 0.5;
|
||||
out->t = pfv0->t + ( pfv1->t - pfv0->t ) * scale + 0.5;
|
||||
out->l = pfv0->l + ( pfv1->l - pfv0->l ) * scale + 0.5;
|
||||
out->zi = pfv0->zi + ( pfv1->zi - pfv0->zi) * scale + 0.5;
|
||||
}
|
||||
else
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrect.y - pfv1->v) /
|
||||
(pfv0->v - pfv1->v);
|
||||
out->u = pfv1->u + ( pfv0->u - pfv1->u ) * scale + 0.5;
|
||||
out->v = pfv1->v + ( pfv0->v - pfv1->v ) * scale + 0.5;
|
||||
out->s = pfv1->s + ( pfv0->s - pfv1->s ) * scale + 0.5;
|
||||
out->t = pfv1->t + ( pfv0->t - pfv1->t ) * scale + 0.5;
|
||||
out->l = pfv1->l + ( pfv0->l - pfv1->l ) * scale + 0.5;
|
||||
out->zi = pfv1->zi + ( pfv0->zi - pfv1->zi) * scale + 0.5;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void R_Alias_clip_bottom (finalvert_t *pfv0, finalvert_t *pfv1,
|
||||
finalvert_t *out)
|
||||
{
|
||||
float scale;
|
||||
|
||||
if (pfv0->v >= pfv1->v)
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrectbottom - pfv0->v) /
|
||||
(pfv1->v - pfv0->v);
|
||||
|
||||
out->u = pfv0->u + ( pfv1->u - pfv0->u ) * scale + 0.5;
|
||||
out->v = pfv0->v + ( pfv1->v - pfv0->v ) * scale + 0.5;
|
||||
out->s = pfv0->s + ( pfv1->s - pfv0->s ) * scale + 0.5;
|
||||
out->t = pfv0->t + ( pfv1->t - pfv0->t ) * scale + 0.5;
|
||||
out->l = pfv0->l + ( pfv1->l - pfv0->l ) * scale + 0.5;
|
||||
out->zi = pfv0->zi + ( pfv1->zi - pfv0->zi) * scale + 0.5;
|
||||
}
|
||||
else
|
||||
{
|
||||
scale = (float)(r_refdef.aliasvrectbottom - pfv1->v) /
|
||||
(pfv0->v - pfv1->v);
|
||||
|
||||
out->u = pfv1->u + ( pfv0->u - pfv1->u ) * scale + 0.5;
|
||||
out->v = pfv1->v + ( pfv0->v - pfv1->v ) * scale + 0.5;
|
||||
out->s = pfv1->s + ( pfv0->s - pfv1->s ) * scale + 0.5;
|
||||
out->t = pfv1->t + ( pfv0->t - pfv1->t ) * scale + 0.5;
|
||||
out->l = pfv1->l + ( pfv0->l - pfv1->l ) * scale + 0.5;
|
||||
out->zi = pfv1->zi + ( pfv0->zi - pfv1->zi) * scale + 0.5;
|
||||
}
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
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].u < r_refdef.aliasvrect.x)
|
||||
out[k].flags |= ALIAS_LEFT_CLIP;
|
||||
if (out[k].v < r_refdef.aliasvrect.y)
|
||||
out[k].flags |= ALIAS_TOP_CLIP;
|
||||
if (out[k].u > r_refdef.aliasvrectright)
|
||||
out[k].flags |= ALIAS_RIGHT_CLIP;
|
||||
if (out[k].v > r_refdef.aliasvrectbottom)
|
||||
out[k].flags |= ALIAS_BOTTOM_CLIP;
|
||||
k++;
|
||||
}
|
||||
if (!flags)
|
||||
{
|
||||
out[k] = in[i];
|
||||
k++;
|
||||
}
|
||||
}
|
||||
|
||||
return k;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
================
|
||||
R_AliasClipTriangle
|
||||
================
|
||||
*/
|
||||
void R_AliasClipTriangle (finalvert_t *index0, finalvert_t *index1, finalvert_t *index2)
|
||||
{
|
||||
int i, k, pingpong;
|
||||
unsigned clipflags;
|
||||
|
||||
// copy vertexes and fix seam texture coordinates
|
||||
fv[0][0] = *index0;
|
||||
fv[0][1] = *index1;
|
||||
fv[0][2] = *index2;
|
||||
|
||||
// clip
|
||||
clipflags = fv[0][0].flags | fv[0][1].flags | fv[0][2].flags;
|
||||
|
||||
if (clipflags & ALIAS_Z_CLIP)
|
||||
{
|
||||
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].u < r_refdef.aliasvrect.x)
|
||||
fv[pingpong][i].u = r_refdef.aliasvrect.x;
|
||||
else if (fv[pingpong][i].u > r_refdef.aliasvrectright)
|
||||
fv[pingpong][i].u = r_refdef.aliasvrectright;
|
||||
|
||||
if (fv[pingpong][i].v < r_refdef.aliasvrect.y)
|
||||
fv[pingpong][i].v = r_refdef.aliasvrect.y;
|
||||
else if (fv[pingpong][i].v > r_refdef.aliasvrectbottom)
|
||||
fv[pingpong][i].v = r_refdef.aliasvrectbottom;
|
||||
|
||||
fv[pingpong][i].flags = 0;
|
||||
}
|
||||
|
||||
// draw triangles
|
||||
for (i=1 ; i<k-1 ; i++)
|
||||
{
|
||||
aliastriangleparms.a = &fv[pingpong][0];
|
||||
aliastriangleparms.b = &fv[pingpong][i];
|
||||
aliastriangleparms.c = &fv[pingpong][i+1];
|
||||
R_DrawTriangle();
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user