diff options
Diffstat (limited to 'WinQuake/d_sky.c')
| -rw-r--r-- | WinQuake/d_sky.c | 276 |
1 files changed, 138 insertions, 138 deletions
diff --git a/WinQuake/d_sky.c b/WinQuake/d_sky.c index 2f77d93..6007b6a 100644 --- a/WinQuake/d_sky.c +++ b/WinQuake/d_sky.c @@ -1,138 +1,138 @@ -/* -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 the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - -*/ -// d_sky.c - -#include "quakedef.h" -#include "r_local.h" -#include "d_local.h" - -#define SKY_SPAN_SHIFT 5 -#define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT) - - -/* -================= -D_Sky_uv_To_st -================= -*/ -void D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t) -{ - float wu, wv, temp; - vec3_t end; - - 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-((int)vid.width>>1)) / temp; - wv = 8192.0 * (float)(((int)vid.height>>1)-v) / temp; - - end[0] = 4096*vpn[0] + wu*vright[0] + wv*vup[0]; - end[1] = 4096*vpn[1] + wu*vright[1] + wv*vup[1]; - end[2] = 4096*vpn[2] + wu*vright[2] + wv*vup[2]; - end[2] *= 3; - VectorNormalize (end); - - temp = skytime*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); -} - - -/* -================= -D_DrawSkyScans8 -================= -*/ -void D_DrawSkyScans8 (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 - - 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); -} - +/*
+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 the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+*/
+// d_sky.c
+
+#include "quakedef.h"
+#include "r_local.h"
+#include "d_local.h"
+
+#define SKY_SPAN_SHIFT 5
+#define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT)
+
+
+/*
+=================
+D_Sky_uv_To_st
+=================
+*/
+void D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t)
+{
+ float wu, wv, temp;
+ vec3_t end;
+
+ 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-((int)vid.width>>1)) / temp;
+ wv = 8192.0 * (float)(((int)vid.height>>1)-v) / temp;
+
+ end[0] = 4096*vpn[0] + wu*vright[0] + wv*vup[0];
+ end[1] = 4096*vpn[1] + wu*vright[1] + wv*vup[1];
+ end[2] = 4096*vpn[2] + wu*vright[2] + wv*vup[2];
+ end[2] *= 3;
+ VectorNormalize (end);
+
+ temp = skytime*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);
+}
+
+
+/*
+=================
+D_DrawSkyScans8
+=================
+*/
+void D_DrawSkyScans8 (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
+
+ 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);
+}
+
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