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https://github.com/libretro/libretro-tyrquake.git
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297 lines
7.1 KiB
C
297 lines
7.1 KiB
C
/*
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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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdint.h>
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#include "d_local.h"
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#include "quakedef.h"
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#include "r_local.h"
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#ifdef NQ_HACK
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#include "client.h"
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#endif
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static int miplevel;
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static vec3_t transformed_modelorg;
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float scale_for_mip;
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int screenwidth;
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int ubasestep, errorterm, erroradjustup, erroradjustdown;
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/*
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=============
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D_MipLevelForScale
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=============
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*/
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static int
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D_MipLevelForScale(float scale)
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{
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int lmiplevel;
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if (scale >= d_scalemip[0])
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lmiplevel = 0;
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else if (scale >= d_scalemip[1])
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lmiplevel = 1;
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else if (scale >= d_scalemip[2])
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lmiplevel = 2;
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else
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lmiplevel = 3;
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if (lmiplevel < d_minmip)
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lmiplevel = d_minmip;
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return lmiplevel;
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}
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/*
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==============
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D_DrawSolidSurface
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==============
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*/
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// FIXME: clean this up
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static void
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D_DrawSolidSurface(surf_t *surf, int color)
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{
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espan_t *span;
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byte *pdest;
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int u, u2, pix;
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pix = (color << 24) | (color << 16) | (color << 8) | color;
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for (span = surf->spans; span; span = span->pnext) {
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pdest = (byte *)d_viewbuffer + screenwidth * span->v;
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u = span->u;
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u2 = span->u + span->count - 1;
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((byte *)pdest)[u] = pix;
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if (u2 - u < 8) {
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for (u++; u <= u2; u++)
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((byte *)pdest)[u] = pix;
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} else {
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for (u++; u & 3; u++)
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((byte *)pdest)[u] = pix;
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u2 -= 4;
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for (; u <= u2; u += 4)
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*(int *)((byte *)pdest + u) = pix;
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u2 += 4;
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for (; u <= u2; u++)
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((byte *)pdest)[u] = pix;
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}
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}
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}
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/*
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==============
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D_CalcGradients
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==============
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*/
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static void
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D_CalcGradients(msurface_t *pface)
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{
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float mipscale;
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vec3_t p_temp1;
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vec3_t p_saxis, p_taxis;
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float t;
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mipscale = 1.0 / (float)(1 << miplevel);
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TransformVector(pface->texinfo->vecs[0], p_saxis);
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TransformVector(pface->texinfo->vecs[1], p_taxis);
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t = xscaleinv * mipscale;
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d_sdivzstepu = p_saxis[0] * t;
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d_tdivzstepu = p_taxis[0] * t;
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t = yscaleinv * mipscale;
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d_sdivzstepv = -p_saxis[1] * t;
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d_tdivzstepv = -p_taxis[1] * t;
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d_sdivzorigin = p_saxis[2] * mipscale - xcenter * d_sdivzstepu -
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ycenter * d_sdivzstepv;
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d_tdivzorigin = p_taxis[2] * mipscale - xcenter * d_tdivzstepu -
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ycenter * d_tdivzstepv;
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VectorScale(transformed_modelorg, mipscale, p_temp1);
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t = 0x10000 * mipscale;
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sadjust = ((fixed16_t)(DotProduct(p_temp1, p_saxis) * 0x10000 + 0.5)) -
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((pface->texturemins[0] << 16) >> miplevel)
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+ pface->texinfo->vecs[0][3] * t;
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tadjust = ((fixed16_t)(DotProduct(p_temp1, p_taxis) * 0x10000 + 0.5)) -
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((pface->texturemins[1] << 16) >> miplevel)
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+ pface->texinfo->vecs[1][3] * t;
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//
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// -1 (-epsilon) so we never wander off the edge of the texture
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//
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bbextents = ((pface->extents[0] << 16) >> miplevel) - 1;
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bbextentt = ((pface->extents[1] << 16) >> miplevel) - 1;
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}
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/*
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==============
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D_DrawSurfaces
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==============
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*/
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void
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D_DrawSurfaces(void)
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{
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const entity_t *e;
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surf_t *s;
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msurface_t *pface;
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surfcache_t *pcurrentcache;
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vec3_t world_transformed_modelorg;
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vec3_t local_modelorg;
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e = &r_worldentity;
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TransformVector(modelorg, transformed_modelorg);
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VectorCopy(transformed_modelorg, world_transformed_modelorg);
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// TODO: could preset a lot of this at mode set time
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if (r_drawflat.value) {
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for (s = &surfaces[1]; s < surface_p; s++) {
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if (!s->spans)
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continue;
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d_zistepu = s->d_zistepu;
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d_zistepv = s->d_zistepv;
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d_ziorigin = s->d_ziorigin;
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D_DrawSolidSurface(s, (intptr_t)s->data & 0xFF);
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D_DrawZSpans(s->spans);
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}
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} else {
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for (s = &surfaces[1]; s < surface_p; s++) {
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if (!s->spans)
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continue;
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r_drawnpolycount++;
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d_zistepu = s->d_zistepu;
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d_zistepv = s->d_zistepv;
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d_ziorigin = s->d_ziorigin;
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if (s->flags & SURF_DRAWSKY) {
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if (!r_skymade) {
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R_MakeSky();
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}
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D_DrawSkyScans8(s->spans);
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D_DrawZSpans(s->spans);
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} else if (s->flags & SURF_DRAWBACKGROUND) {
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// set up a gradient for the background surface that places it
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// effectively at infinity distance from the viewpoint
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d_zistepu = 0;
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d_zistepv = 0;
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d_ziorigin = -0.9;
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D_DrawSolidSurface(s, (int)r_clearcolor.value & 0xFF);
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D_DrawZSpans(s->spans);
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} else if (s->flags & SURF_DRAWTURB) {
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pface = s->data;
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miplevel = 0;
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cacheblock = (pixel_t *)
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((byte *)pface->texinfo->texture +
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pface->texinfo->texture->offsets[0]);
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cachewidth = 64;
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if (s->insubmodel) {
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// FIXME: we don't want to do all this for every polygon!
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// TODO: store once at start of frame
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e = s->entity; //FIXME: make this passed in to
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// R_RotateBmodel ()
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VectorSubtract(r_origin, e->origin, local_modelorg);
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TransformVector(local_modelorg, transformed_modelorg);
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R_RotateBmodel(e); // FIXME: don't mess with the frustum,
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// make entity passed in
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}
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D_CalcGradients(pface);
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Turbulent8(s->spans);
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D_DrawZSpans(s->spans);
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if (s->insubmodel) {
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//
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// restore the old drawing state
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// FIXME: we don't want to do this every time!
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// TODO: speed up
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//
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e = &r_worldentity;
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VectorCopy(world_transformed_modelorg,
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transformed_modelorg);
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VectorCopy(base_vpn, vpn);
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VectorCopy(base_vup, vup);
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VectorCopy(base_vright, vright);
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VectorCopy(base_modelorg, modelorg);
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R_TransformFrustum();
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}
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} else {
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if (s->insubmodel) {
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// FIXME: we don't want to do all this for every polygon!
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// TODO: store once at start of frame
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e = s->entity; //FIXME: make this passed in to
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// R_RotateBmodel ()
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VectorSubtract(r_origin, e->origin, local_modelorg);
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TransformVector(local_modelorg, transformed_modelorg);
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R_RotateBmodel(e); // FIXME: don't mess with the frustum,
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// make entity passed in
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}
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pface = s->data;
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miplevel = D_MipLevelForScale(s->nearzi * scale_for_mip
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* pface->texinfo->mipadjust);
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// FIXME: make this passed in to D_CacheSurface
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pcurrentcache = D_CacheSurface(e, pface, miplevel);
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cacheblock = (pixel_t *)pcurrentcache->data;
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cachewidth = pcurrentcache->width;
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D_CalcGradients(pface);
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D_DrawSpans(s->spans);
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D_DrawZSpans(s->spans);
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if (s->insubmodel) {
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//
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// restore the old drawing state
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// FIXME: we don't want to do this every time!
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// TODO: speed up
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//
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e = &r_worldentity;
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VectorCopy(world_transformed_modelorg,
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transformed_modelorg);
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VectorCopy(base_vpn, vpn);
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VectorCopy(base_vup, vup);
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VectorCopy(base_vright, vright);
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VectorCopy(base_modelorg, modelorg);
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R_TransformFrustum();
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}
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}
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}
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}
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}
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