Add lighting test and benchmark (#12802)

1 files changed, 86 insertions, 0 deletions

diff --git a/src/benchmark/benchmark_lighting.cpp b/src/benchmark/benchmark_lighting.cpp
new file mode 100644
index 000000000..498553715
--- /dev/null
+++ b/src/benchmark/benchmark_lighting.cpp
@@ -0,0 +1,86 @@
+/*
+Minetest
+Copyright (C) 2022 Minetest Authors
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "benchmark_setup.h"
+#include "voxelalgorithms.h"
+#include "dummygamedef.h"
+#include "dummymap.h"
+
+TEST_CASE("benchmark_lighting")
+{
+	DummyGameDef gamedef;
+	NodeDefManager *ndef = gamedef.getWritableNodeDefManager();
+
+	v3s16 pmin(-16, -16, -16);
+	v3s16 pmax(15, 15, 15);
+	v3s16 bpmin = getNodeBlockPos(pmin), bpmax = getNodeBlockPos(pmax);
+	DummyMap map(&gamedef, bpmin, bpmax);
+
+	content_t content_wall;
+	{
+		ContentFeatures f;
+		f.name = "stone";
+		content_wall = ndef->set(f.name, f);
+	}
+
+	content_t content_light;
+	{
+		ContentFeatures f;
+		f.name = "light";
+		f.param_type = CPT_LIGHT;
+		f.light_propagates = true;
+		f.light_source = 14;
+		content_light = ndef->set(f.name, f);
+	}
+
+	// Make a platform with a light below it.
+	{
+		std::map<v3s16, MapBlock*> modified_blocks;
+		MMVManip vm(&map);
+		vm.initialEmerge(bpmin, bpmax, false);
+		s32 volume = vm.m_area.getVolume();
+		for (s32 i = 0; i < volume; i++)
+			vm.m_data[i] = MapNode(CONTENT_AIR);
+		for (s16 z = -10; z <= 10; z++)
+		for (s16 x = -10; x <= 10; x++)
+			vm.setNodeNoEmerge(v3s16(x, 1, z), MapNode(content_wall));
+		vm.setNodeNoEmerge(v3s16(0, -10, 0), MapNode(content_light));
+		voxalgo::blit_back_with_light(&map, &vm, &modified_blocks);
+	}
+
+	BENCHMARK_ADVANCED("voxalgo::update_lighting_nodes")(Catch::Benchmark::Chronometer meter) {
+		std::map<v3s16, MapBlock*> modified_blocks;
+		meter.measure([&] {
+			map.addNodeAndUpdate(v3s16(0, 0, 0), MapNode(content_light), modified_blocks);
+			map.removeNodeAndUpdate(v3s16(0, 0, 0), modified_blocks);
+		});
+	};
+
+	BENCHMARK_ADVANCED("voxalgo::blit_back_with_light")(Catch::Benchmark::Chronometer meter) {
+		std::map<v3s16, MapBlock*> modified_blocks;
+		MMVManip vm(&map);
+		vm.initialEmerge(v3s16(0, 0, 0), v3s16(0, 0, 0), false);
+		meter.measure([&] {
+			vm.setNodeNoEmerge(v3s16(0, 0, 0), MapNode(content_light));
+			voxalgo::blit_back_with_light(&map, &vm, &modified_blocks);
+			vm.setNodeNoEmerge(v3s16(0, 0, 0), MapNode(CONTENT_AIR));
+			voxalgo::blit_back_with_light(&map, &vm, &modified_blocks);
+		});
+	};
+}