92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/* Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(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. See the
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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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See file, 'COPYING', for details.
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*/
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#include <light/light.hh>
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#include <light/trace.hh>
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#include <light/ltface.hh>
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#include <common/bsputils.hh>
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#ifdef HAVE_EMBREE
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#include <light/trace_embree.hh>
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#endif
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#include <cassert>
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/*
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==============
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Light_PointInLeaf
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from hmap2
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==============
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*/
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const mleaf_t *Light_PointInLeaf( const mbsp_t *bsp, const qvec3d &point )
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{
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int num = 0;
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while( num >= 0 )
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num = bsp->dnodes[num].children[bsp->dplanes[bsp->dnodes[num].planenum].distance_to_fast(point) < 0];
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return &bsp->dleafs[-1 - num];
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}
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/*
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==============
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Light_PointContents
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from hmap2
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==============
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*/
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int Light_PointContents( const mbsp_t *bsp, const qvec3d &point )
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{
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return Light_PointInLeaf(bsp, point)->contents;
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}
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/*
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* ============================================================================
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* FENCE TEXTURE TESTING
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* ============================================================================
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*/
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/**
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* Given a float texture coordinate, returns a pixel index to sample in [0, width-1].
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* This assumes the texture repeats and nearest filtering
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*/
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uint32_t clamp_texcoord(vec_t in, uint32_t width)
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{
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if (in >= 0.0f) {
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return (uint32_t)in % width;
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} else {
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vec_t in_abs = ceil(fabs(in));
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uint32_t in_abs_mod = (uint32_t)in_abs % width;
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return (width - in_abs_mod) % width;
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}
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}
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qvec4b SampleTexture(const mface_t *face, const mtexinfo_t *tex, const img::texture *texture, const mbsp_t *bsp, const qvec3d &point)
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{
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if (texture == nullptr || !texture->meta.width) {
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return {};
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}
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qvec2d texcoord = WorldToTexCoord(point, tex);
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const uint32_t x = clamp_texcoord(texcoord[0], texture->meta.width);
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const uint32_t y = clamp_texcoord(texcoord[1], texture->meta.height);
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return texture->pixels[(texture->meta.width * y) + x];
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}
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