257 lines
7.2 KiB
C++
257 lines
7.2 KiB
C++
/* Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 2017 Eric Wasylishen
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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/bounce.hh>
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#include <cstdint>
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#include <atomic>
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#include <light/light.hh>
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#include <light/entities.hh> // for EstimateVisibleBoundsAtPoint
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#include <light/ltface.hh>
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#include <light/surflight.hh>
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#include <light/trace.hh> // for Light_PointInLeaf
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#include <common/polylib.hh>
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#include <common/bsputils.hh>
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#include <vector>
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#include <unordered_map>
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#include <mutex>
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#include <common/qvec.hh>
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#include <common/parallel.hh>
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using namespace polylib;
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static std::atomic_size_t bouncelightpoints;
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void ResetBounce()
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{
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bouncelightpoints = 0;
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}
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static bool Face_ShouldBounce(const mbsp_t *bsp, const mface_t *face)
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{
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// make bounce light, only if this face is shadow casting
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const modelinfo_t *mi = ModelInfoForFace(bsp, Face_GetNum(bsp, face));
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if (!mi || !mi->shadow.boolValue()) {
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return false;
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}
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if (!Face_IsLightmapped(bsp, face)) {
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return false;
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}
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const char *texname = Face_TextureName(bsp, face);
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if (!Q_strcasecmp("skip", texname)) {
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return false;
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}
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// check for "_bounce" "-1"
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const auto &ext_info = extended_texinfo_flags[face->texinfo];
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if (ext_info.no_bounce) {
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return false;
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}
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// don't bounce *from* emission surfaces
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if (IsSurfaceLitFace(bsp, face)) {
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return false;
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}
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// don't bounce from faces on non-default object channels
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if (mi->object_channel_mask.value() != CHANNEL_MASK_DEFAULT) {
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return false;
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}
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if (ext_info.object_channel_mask.value_or(CHANNEL_MASK_DEFAULT) != CHANNEL_MASK_DEFAULT) {
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return false;
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}
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return true;
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}
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static void MakeBounceLight(const mbsp_t *bsp, const settings::worldspawn_keys &cfg, lightsurf_t &surf,
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qvec3d texture_color, int32_t style, const std::vector<qvec3f> &points, const winding_t &winding, const vec_t &area,
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const qvec3d &facenormal, const qvec3d &facemidpoint)
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{
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if (!Face_IsEmissive(bsp, surf.face)) {
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return;
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}
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bouncelightpoints += points.size();
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// Calculate emit color and intensity...
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// Calculate intensity...
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vec_t intensity = qv::max(texture_color);
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if (intensity <= 0.0) {
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return;
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}
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if (!surf.vpl) {
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auto &l = surf.vpl = std::make_unique<surfacelight_t>();
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// Normalize color...
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if (intensity > 1.0) {
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texture_color *= 1.0 / intensity;
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}
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// Sanity checks...
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Q_assert(!points.empty());
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// Add surfacelight...
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l->surfnormal = facenormal;
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l->points = points;
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// Init bbox...
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if (light_options.visapprox.value() == visapprox_t::RAYS) {
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l->bounds = EstimateVisibleBoundsAtPoint(facemidpoint);
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}
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for (auto &pt : l->points) {
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if (light_options.visapprox.value() == visapprox_t::VIS) {
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l->leaves.push_back(Light_PointInLeaf(bsp, pt));
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} else if (light_options.visapprox.value() == visapprox_t::RAYS) {
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l->bounds += EstimateVisibleBoundsAtPoint(pt);
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}
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}
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l->pos = facemidpoint;
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}
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// Store surfacelight settings...
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{
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auto &l = surf.vpl;
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auto &setting = l->styles.emplace_back();
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setting.bounce = true;
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setting.style = style;
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setting.totalintensity = intensity * area;
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setting.intensity = setting.totalintensity / l->points.size();
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setting.color = texture_color;
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}
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}
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static void MakeBounceLightsThread(const settings::worldspawn_keys &cfg, const mbsp_t *bsp, const mface_t &face)
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{
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if (!Face_ShouldBounce(bsp, &face)) {
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return;
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}
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auto &surf_ptr = LightSurfaces()[&face - bsp->dfaces.data()];
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if (!surf_ptr) {
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return;
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}
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auto &surf = *surf_ptr.get();
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// no lights
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if (!surf.lightmapsByStyle.size()) {
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return;
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}
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winding_t winding = winding_t::from_face(bsp, &face);
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vec_t area = winding.area();
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if (area < 1.f) {
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return;
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}
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// Create winding...
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winding.remove_colinear();
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// grab the average color across the whole set of lightmaps for this face.
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// this doesn't change regardless of the above settings.
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std::unordered_map<int, qvec3d> sum;
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vec_t sample_divisor = surf.lightmapsByStyle.front().samples.size();
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bool has_any_color = false;
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for (const auto &lightmap : surf.lightmapsByStyle) {
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if (lightmap.style && !cfg.bouncestyled.value()) {
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continue;
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}
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for (auto &sample : lightmap.samples) {
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sum[lightmap.style] += sample.color;
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}
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}
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for (auto &sample : sum) {
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if (!qv::emptyExact(sample.second)) {
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sample.second /= sample_divisor;
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has_any_color = true;
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}
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}
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// no bounced color, we can leave early
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if (!has_any_color) {
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return;
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}
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// lerp between gray and the texture color according to `bouncecolorscale` (0 = use gray, 1 = use texture color)
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const qvec3d &blendedcolor = Face_LookupTextureBounceColor(bsp, &face);
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// final colors to emit
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std::unordered_map<int, qvec3d> emitcolors;
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for (const auto &styleColor : sum) {
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emitcolors[styleColor.first] = styleColor.second * blendedcolor;
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}
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qplane3d faceplane = winding.plane();
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// Get face normal and midpoint...
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qvec3d facenormal = faceplane.normal;
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qvec3d facemidpoint = winding.center() + facenormal; // Lift 1 unit
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std::vector<qvec3f> points;
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if (light_options.emissivequality.value() == emissivequality_t::LOW ||
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light_options.emissivequality.value() == emissivequality_t::MEDIUM) {
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points = {facemidpoint};
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if (light_options.emissivequality.value() == emissivequality_t::MEDIUM) {
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for (auto &pt : winding) {
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points.push_back(pt + faceplane.normal);
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}
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}
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} else {
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winding.dice(cfg.bouncelightsubdivision.value(),
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[&points, &faceplane](winding_t &w) { points.push_back(w.center() + faceplane.normal); });
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}
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for (auto &style : emitcolors) {
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MakeBounceLight(bsp, cfg, surf, style.second, style.first, points, winding, area, facenormal, facemidpoint);
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}
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}
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void MakeBounceLights(const settings::worldspawn_keys &cfg, const mbsp_t *bsp)
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{
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logging::funcheader();
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logging::parallel_for_each(bsp->dfaces, [&](const mface_t &face) { MakeBounceLightsThread(cfg, bsp, face); });
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// logging::print("{} bounce lights created, with {} points\n", bouncelights.size(), bouncelightpoints);
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}
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