mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-13 08:27:39 +00:00
0c437492b4
For now, OpenGL and Vulkan renderers are broken as I focused on getting the software renderer working (which was quite tricky to get right). This fixes a couple of issues: the segfault when warping the screen (due to the scene rendering move invalidating the warp buffer), and warp always having 320x200 resolution. There's still the problem of the effect being too subtle at high resolution, but that's just a matter of updating the tables and tweaking the code in D_WarpScreen. Another issue is the Draw functions should probably write directly to the main frame buffer or even one passed in as a parameter. This would remove the need for binding the main buffer at the beginning and end of the frame.
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/*
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d_sky.c
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(description)
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "QF/render.h"
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#include "d_local.h"
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#include "r_internal.h"
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#define SKY_SPAN_SHIFT 5
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#define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT)
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float d_skyoffs;
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static void
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D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t)
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{
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float wu, wv, temp;
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vec3_t end;
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int half_width = vid.width >> 1;
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int half_height = vid.height >> 1;
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if (r_refdef.vrect.width >= r_refdef.vrect.height)
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temp = (float) r_refdef.vrect.width;
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else
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temp = (float) r_refdef.vrect.height;
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wu = 8192.0 * (float) (u - half_width) / temp;
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wv = 8192.0 * (float) (half_height - v) / temp;
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end[0] = 4096 * vfwd[0] + wu * vright[0] + wv * vup[0];
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end[1] = 4096 * vfwd[1] + wu * vright[1] + wv * vup[1];
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end[2] = 4096 * vfwd[2] + wu * vright[2] + wv * vup[2];
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end[2] *= 3;
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VectorNormalize (end);
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*s = (int) ((d_skyoffs + 6 * (SKYSIZE / 2 - 1) * end[0]) * 0x10000);
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*t = (int) ((d_skyoffs + 6 * (SKYSIZE / 2 - 1) * end[1]) * 0x10000);
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}
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void
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D_DrawSkyScans (espan_t *pspan)
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{
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int count, spancount, u, v;
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byte *pdest;
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fixed16_t s, t, snext, tnext, sstep, tstep;
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int spancountminus1;
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sstep = 0; // keep compiler happy
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tstep = 0; // ditto
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snext = 0; // ditto
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tnext = 0; // ditto
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do {
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pdest = d_viewbuffer + (d_rowbytes * pspan->v) + pspan->u;
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count = pspan->count;
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// calculate the initial s & t
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u = pspan->u;
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v = pspan->v;
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D_Sky_uv_To_st (u, v, &s, &t);
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do {
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if (count >= SKY_SPAN_MAX)
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spancount = SKY_SPAN_MAX;
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else
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spancount = count;
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count -= spancount;
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if (count) {
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u += spancount;
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// calculate s and t at far end of span,
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// calculate s and t steps across span by shifting
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D_Sky_uv_To_st (u, v, &snext, &tnext);
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sstep = (snext - s) >> SKY_SPAN_SHIFT;
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tstep = (tnext - t) >> SKY_SPAN_SHIFT;
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} else {
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// calculate s and t at last pixel in span,
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// calculate s and t steps across span by division
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spancountminus1 = (float) (spancount - 1);
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if (spancountminus1 > 0) {
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u += spancountminus1;
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D_Sky_uv_To_st (u, v, &snext, &tnext);
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sstep = (snext - s) / spancountminus1;
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tstep = (tnext - t) / spancountminus1;
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}
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}
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do {
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*pdest++ = r_skysource[((t & R_SKY_TMASK) >> 8) +
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((s & R_SKY_SMASK) >> 16)];
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s += sstep;
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t += tstep;
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} while (--spancount > 0);
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s = snext;
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t = tnext;
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} while (count > 0);
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} while ((pspan = pspan->pnext) != NULL);
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}
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