quakeforge/libs/video/renderer/sw/sw_rsprite.c

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/*
sw_rsprite.c
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(description)
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
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <string.h>
#endif
#include <math.h>
#include "QF/console.h"
#include "QF/render.h"
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#include "QF/sys.h"
#include "r_local.h"
static int clip_current;
static vec5_t clip_verts[2][MAXWORKINGVERTS];
static int sprite_width, sprite_height;
spritedesc_t r_spritedesc;
void
R_RotateSprite (float beamlength)
{
vec3_t vec;
if (beamlength == 0.0)
return;
VectorScale (r_spritedesc.vpn, -beamlength, vec);
VectorAdd (r_entorigin, vec, r_entorigin);
VectorSubtract (modelorg, vec, modelorg);
}
/*
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R_ClipSpriteFace
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Clips the winding at clip_verts[clip_current] and changes clip_current
Throws out the back side
*/
int
R_ClipSpriteFace (int nump, clipplane_t *pclipplane)
{
int i, outcount;
float dists[MAXWORKINGVERTS + 1];
float frac, clipdist, *pclipnormal;
float *in, *instep, *outstep, *vert2;
clipdist = pclipplane->dist;
pclipnormal = pclipplane->normal;
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// calc dists
if (clip_current) {
in = clip_verts[1][0];
outstep = clip_verts[0][0];
clip_current = 0;
} else {
in = clip_verts[0][0];
outstep = clip_verts[1][0];
clip_current = 1;
}
instep = in;
for (i = 0; i < nump; i++, instep += sizeof (vec5_t) / sizeof (float)) {
dists[i] = DotProduct (instep, pclipnormal) - clipdist;
}
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// handle wraparound case
dists[nump] = dists[0];
memcpy (instep, in, sizeof (vec5_t));
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// clip the winding
instep = in;
outcount = 0;
for (i = 0; i < nump; i++, instep += sizeof (vec5_t) / sizeof (float)) {
if (dists[i] >= 0) {
memcpy (outstep, instep, sizeof (vec5_t));
outstep += sizeof (vec5_t) / sizeof (float);
outcount++;
}
if (dists[i] == 0 || dists[i + 1] == 0)
continue;
if ((dists[i] > 0) == (dists[i + 1] > 0))
continue;
// split it into a new vertex
frac = dists[i] / (dists[i] - dists[i + 1]);
vert2 = instep + sizeof (vec5_t) / sizeof (float);
outstep[0] = instep[0] + frac * (vert2[0] - instep[0]);
outstep[1] = instep[1] + frac * (vert2[1] - instep[1]);
outstep[2] = instep[2] + frac * (vert2[2] - instep[2]);
outstep[3] = instep[3] + frac * (vert2[3] - instep[3]);
outstep[4] = instep[4] + frac * (vert2[4] - instep[4]);
outstep += sizeof (vec5_t) / sizeof (float);
outcount++;
}
return outcount;
}
void
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R_SetupAndDrawSprite (void)
{
int i, nump;
float dot, scale, *pv;
vec5_t *pverts;
vec3_t left, up, right, down, transformed, local;
emitpoint_t outverts[MAXWORKINGVERTS + 1], *pout;
dot = DotProduct (r_spritedesc.vpn, modelorg);
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// backface cull
if (dot >= 0)
return;
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// build the sprite poster in worldspace
VectorScale (r_spritedesc.vright, r_spritedesc.pspriteframe->right, right);
VectorScale (r_spritedesc.vup, r_spritedesc.pspriteframe->up, up);
VectorScale (r_spritedesc.vright, r_spritedesc.pspriteframe->left, left);
VectorScale (r_spritedesc.vup, r_spritedesc.pspriteframe->down, down);
pverts = clip_verts[0];
pverts[0][0] = r_entorigin[0] + up[0] + left[0];
pverts[0][1] = r_entorigin[1] + up[1] + left[1];
pverts[0][2] = r_entorigin[2] + up[2] + left[2];
pverts[0][3] = 0;
pverts[0][4] = 0;
pverts[1][0] = r_entorigin[0] + up[0] + right[0];
pverts[1][1] = r_entorigin[1] + up[1] + right[1];
pverts[1][2] = r_entorigin[2] + up[2] + right[2];
pverts[1][3] = sprite_width;
pverts[1][4] = 0;
pverts[2][0] = r_entorigin[0] + down[0] + right[0];
pverts[2][1] = r_entorigin[1] + down[1] + right[1];
pverts[2][2] = r_entorigin[2] + down[2] + right[2];
pverts[2][3] = sprite_width;
pverts[2][4] = sprite_height;
pverts[3][0] = r_entorigin[0] + down[0] + left[0];
pverts[3][1] = r_entorigin[1] + down[1] + left[1];
pverts[3][2] = r_entorigin[2] + down[2] + left[2];
pverts[3][3] = 0;
pverts[3][4] = sprite_height;
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// clip to the frustum in worldspace
nump = 4;
clip_current = 0;
for (i = 0; i < 4; i++) {
nump = R_ClipSpriteFace (nump, &view_clipplanes[i]);
if (nump < 3)
return;
if (nump >= MAXWORKINGVERTS)
Sys_Error ("R_SetupAndDrawSprite: too many points");
}
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// transform vertices into viewspace and project
pv = &clip_verts[clip_current][0][0];
r_spritedesc.nearzi = -999999;
for (i = 0; i < nump; i++) {
VectorSubtract (pv, r_origin, local);
TransformVector (local, transformed);
if (transformed[2] < NEAR_CLIP)
transformed[2] = NEAR_CLIP;
pout = &outverts[i];
pout->zi = 1.0 / transformed[2];
if (pout->zi > r_spritedesc.nearzi)
r_spritedesc.nearzi = pout->zi;
pout->s = pv[3];
pout->t = pv[4];
scale = xscale * pout->zi;
pout->u = (xcenter + scale * transformed[0]);
scale = yscale * pout->zi;
pout->v = (ycenter - scale * transformed[1]);
pv += sizeof (vec5_t) / sizeof (*pv);
}
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// draw it
r_spritedesc.nump = nump;
r_spritedesc.pverts = outverts;
D_DrawSprite ();
}
mspriteframe_t *
R_GetSpriteframe (msprite_t *psprite)
{
mspritegroup_t *pspritegroup;
mspriteframe_t *pspriteframe;
int i, numframes, frame;
float *pintervals, fullinterval, targettime, time;
frame = currententity->frame;
if ((frame >= psprite->numframes) || (frame < 0)) {
Con_Printf ("R_DrawSprite: no such frame %d\n", frame);
frame = 0;
}
if (psprite->frames[frame].type == SPR_SINGLE) {
pspriteframe = psprite->frames[frame].frameptr;
} else {
pspritegroup = (mspritegroup_t *) psprite->frames[frame].frameptr;
pintervals = pspritegroup->intervals;
numframes = pspritegroup->numframes;
fullinterval = pintervals[numframes - 1];
time = r_realtime + currententity->syncbase;
// when loading in Mod_LoadSpriteGroup, we guaranteed all interval
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// values are positive, so we don't have to worry about division by 0
targettime = time - ((int) (time / fullinterval)) * fullinterval;
for (i = 0; i < (numframes - 1); i++) {
if (pintervals[i] > targettime)
break;
}
pspriteframe = pspritegroup->frames[i];
}
return pspriteframe;
}
void
R_DrawSprite (void)
{
int i;
msprite_t *psprite;
vec3_t tvec;
float dot, angle, sr, cr;
psprite = currententity->model->cache.data;
r_spritedesc.pspriteframe = R_GetSpriteframe (psprite);
sprite_width = r_spritedesc.pspriteframe->width;
sprite_height = r_spritedesc.pspriteframe->height;
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// TODO: make this caller-selectable
if (psprite->type == SPR_FACING_UPRIGHT) {
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// generate the sprite's axes, with vup straight up in worldspace, and
// r_spritedesc.vright perpendicular to modelorg.
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// This will not work if the view direction is very close to straight
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// up or down, because the cross product will be between two nearly
// parallel vectors and starts to approach an undefined state, so we
// don't draw if the two vectors are less than 1 degree apart
tvec[0] = -modelorg[0];
tvec[1] = -modelorg[1];
tvec[2] = -modelorg[2];
VectorNormalize (tvec);
dot = tvec[2]; // same as DotProduct (tvec,
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// r_spritedesc.vup) because
// r_spritedesc.vup is 0, 0, 1
if ((dot > 0.999848) || (dot < -0.999848)) // cos(1 degree) =
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// 0.999848
return;
r_spritedesc.vup[0] = 0;
r_spritedesc.vup[1] = 0;
r_spritedesc.vup[2] = 1;
r_spritedesc.vright[0] = tvec[1];
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//CrossProduct(r_spritedesc.vup, -modelorg, r_spritedesc.vright)
r_spritedesc.vright[1] = -tvec[0];
r_spritedesc.vright[2] = 0;
VectorNormalize (r_spritedesc.vright);
r_spritedesc.vpn[0] = -r_spritedesc.vright[1];
r_spritedesc.vpn[1] = r_spritedesc.vright[0];
r_spritedesc.vpn[2] = 0;
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//CrossProduct (r_spritedesc.vright, r_spritedesc.vup, r_spritedesc.vpn)
} else if (psprite->type == SPR_VP_PARALLEL) {
// generate the sprite's axes, completely parallel to the viewplane.
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// There are no problem situations, because the sprite is always in the
// same position relative to the viewer
for (i = 0; i < 3; i++) {
r_spritedesc.vup[i] = vup[i];
r_spritedesc.vright[i] = vright[i];
r_spritedesc.vpn[i] = vpn[i];
}
} else if (psprite->type == SPR_VP_PARALLEL_UPRIGHT) {
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// generate the sprite's axes, with vup straight up in worldspace, and
// r_spritedesc.vright parallel to the viewplane.
// This will not work if the view direction is very close to straight
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// up or down, because the cross product will be between two nearly
// parallel vectors and starts to approach an undefined state, so we
// don't draw if the two vectors are less than 1 degree apart
dot = vpn[2]; // same as DotProduct (vpn,
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// r_spritedesc.vup) because
// r_spritedesc.vup is 0, 0, 1
if ((dot > 0.999848) || (dot < -0.999848)) // cos(1 degree) =
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// 0.999848
return;
r_spritedesc.vup[0] = 0;
r_spritedesc.vup[1] = 0;
r_spritedesc.vup[2] = 1;
r_spritedesc.vright[0] = vpn[1];
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//CrossProduct (r_spritedesc.vup, vpn,
r_spritedesc.vright[1] = -vpn[0]; // r_spritedesc.vright)
r_spritedesc.vright[2] = 0;
VectorNormalize (r_spritedesc.vright);
r_spritedesc.vpn[0] = -r_spritedesc.vright[1];
r_spritedesc.vpn[1] = r_spritedesc.vright[0];
r_spritedesc.vpn[2] = 0;
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//CrossProduct (r_spritedesc.vright, r_spritedesc.vup, r_spritedesc.vpn)
} else if (psprite->type == SPR_ORIENTED) {
// generate the sprite's axes, according to the sprite's world
// orientation
AngleVectors (currententity->angles, r_spritedesc.vpn,
r_spritedesc.vright, r_spritedesc.vup);
} else if (psprite->type == SPR_VP_PARALLEL_ORIENTED) {
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// generate the sprite's axes, parallel to the viewplane, but rotated
// in that plane around the center according to the sprite entity's
// roll angle. So vpn stays the same, but vright and vup rotate
angle = currententity->angles[ROLL] * (M_PI * 2 / 360);
sr = sin (angle);
cr = cos (angle);
for (i = 0; i < 3; i++) {
r_spritedesc.vpn[i] = vpn[i];
r_spritedesc.vright[i] = vright[i] * cr + vup[i] * sr;
r_spritedesc.vup[i] = vright[i] * -sr + vup[i] * cr;
}
} else {
Sys_Error ("R_DrawSprite: Bad sprite type %d", psprite->type);
}
R_RotateSprite (psprite->beamlength);
R_SetupAndDrawSprite ();
}