mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-15 01:11:27 +00:00
bce7d5b832
This moves the common camera setup code out of the individual drivers, and completely removes vup/vright/vpn from the non-software renderers. This has highlighted the craziness around AngleVectors with it putting +X forward, -Y right and +Z up. The main issue with this is it requires a 90 degree pre-rotation about the Z axis to get the camera pointing in the right direction, and that's for the native sw renderer (vulkan needs a 90 degree pre-rotation about X, and gl and glsl need to invert an axis, too), though at least it's just a matrix swizzle and vector negation. However, it does mean the camera matrices can't be used directly. Also rename vpn to vfwd (still abbreviated, but fwd is much clearer in meaning (to me, at least) than pn (plane normal, I guess, but which way?)).
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/*
|
|
d_sky.c
|
|
|
|
(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
|
|
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include "QF/render.h"
|
|
|
|
#include "d_local.h"
|
|
#include "r_internal.h"
|
|
|
|
#define SKY_SPAN_SHIFT 5
|
|
#define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT)
|
|
|
|
|
|
static void
|
|
D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t)
|
|
{
|
|
float wu, wv, temp;
|
|
vec3_t end;
|
|
int half_width = vid.width >> 1;
|
|
int half_height = vid.height >> 1;
|
|
|
|
if (r_refdef.vrect.width >= r_refdef.vrect.height)
|
|
temp = (float) r_refdef.vrect.width;
|
|
else
|
|
temp = (float) r_refdef.vrect.height;
|
|
|
|
wu = 8192.0 * (float) (u - half_width) / temp;
|
|
wv = 8192.0 * (float) (half_height - v) / temp;
|
|
|
|
end[0] = 4096 * vfwd[0] + wu * vright[0] + wv * vup[0];
|
|
end[1] = 4096 * vfwd[1] + wu * vright[1] + wv * vup[1];
|
|
end[2] = 4096 * vfwd[2] + wu * vright[2] + wv * vup[2];
|
|
end[2] *= 3;
|
|
VectorNormalize (end);
|
|
|
|
temp = r_skytime * r_skyspeed; // TODO: add D_SetupFrame & set this there
|
|
*s = (int) ((temp + 6 * (SKYSIZE / 2 - 1) * end[0]) * 0x10000);
|
|
*t = (int) ((temp + 6 * (SKYSIZE / 2 - 1) * end[1]) * 0x10000);
|
|
}
|
|
|
|
void
|
|
D_DrawSkyScans (espan_t *pspan)
|
|
{
|
|
int count, spancount, u, v;
|
|
unsigned char *pdest;
|
|
fixed16_t s, t, snext, tnext, sstep, tstep;
|
|
int spancountminus1;
|
|
|
|
sstep = 0; // keep compiler happy
|
|
tstep = 0; // ditto
|
|
snext = 0; // ditto
|
|
tnext = 0; // ditto
|
|
|
|
do {
|
|
pdest = (unsigned char *) ((byte *) d_viewbuffer +
|
|
(screenwidth * pspan->v) + pspan->u);
|
|
|
|
count = pspan->count;
|
|
|
|
// calculate the initial s & t
|
|
u = pspan->u;
|
|
v = pspan->v;
|
|
D_Sky_uv_To_st (u, v, &s, &t);
|
|
|
|
do {
|
|
if (count >= SKY_SPAN_MAX)
|
|
spancount = SKY_SPAN_MAX;
|
|
else
|
|
spancount = count;
|
|
|
|
count -= spancount;
|
|
|
|
if (count) {
|
|
u += spancount;
|
|
|
|
// calculate s and t at far end of span,
|
|
// calculate s and t steps across span by shifting
|
|
D_Sky_uv_To_st (u, v, &snext, &tnext);
|
|
|
|
sstep = (snext - s) >> SKY_SPAN_SHIFT;
|
|
tstep = (tnext - t) >> SKY_SPAN_SHIFT;
|
|
} else {
|
|
// calculate s and t at last pixel in span,
|
|
// calculate s and t steps across span by division
|
|
spancountminus1 = (float) (spancount - 1);
|
|
|
|
if (spancountminus1 > 0) {
|
|
u += spancountminus1;
|
|
D_Sky_uv_To_st (u, v, &snext, &tnext);
|
|
|
|
sstep = (snext - s) / spancountminus1;
|
|
tstep = (tnext - t) / spancountminus1;
|
|
}
|
|
}
|
|
|
|
do {
|
|
*pdest++ = r_skysource[((t & R_SKY_TMASK) >> 8) +
|
|
((s & R_SKY_SMASK) >> 16)];
|
|
s += sstep;
|
|
t += tstep;
|
|
} while (--spancount > 0);
|
|
|
|
s = snext;
|
|
t = tnext;
|
|
|
|
} while (count > 0);
|
|
|
|
} while ((pspan = pspan->pnext) != NULL);
|
|
}
|