101 lines
2.9 KiB
C++
101 lines
2.9 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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* 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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color_rgba // mxd. int -> color_rgba
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SampleTexture(const mface_t *face, const mbsp_t *bsp, const qvec3d &point)
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{
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color_rgba sample{};
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const auto *miptex = Face_RgbaMiptex(bsp, face);
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if (miptex == nullptr || !miptex->width)
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return sample;
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const gtexinfo_t *tex = &bsp->texinfo[face->texinfo];
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vec_t texcoord[2];
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WorldToTexCoord(point, tex, texcoord);
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const uint32_t x = clamp_texcoord(texcoord[0], miptex->width);
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const uint32_t y = clamp_texcoord(texcoord[1], miptex->height);
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const uint8_t *data = miptex->data.get() + ((miptex->width * y) + x) * 4;
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sample.r = data[0];
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sample.g = data[1];
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sample.b = data[2];
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sample.a = data[3];
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return sample;
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}
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hitresult_t TestSky(const qvec3d &start, const qvec3d &dirn, const modelinfo_t *self, const mface_t **face_out)
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{
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return Embree_TestSky(start, dirn, self, face_out);
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}
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hitresult_t TestLight(const qvec3d &start, const qvec3d &stop, const modelinfo_t *self)
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{
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return Embree_TestLight(start, stop, self);
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}
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raystream_intersection_t *MakeIntersectionRayStream(int maxrays)
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{
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return Embree_MakeIntersectionRayStream(maxrays);
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}
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raystream_occlusion_t *MakeOcclusionRayStream(int maxrays)
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{
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return Embree_MakeOcclusionRayStream(maxrays);
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}
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void MakeTnodes(const mbsp_t *bsp)
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{
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Embree_TraceInit(bsp);
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}
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