From 16bec12e3e75e95d251745f904ac4e15af9c9724 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 28 Oct 2023 02:34:45 +0100
Subject: Initial OpenMesh based terrain data and tests

---
 test/test-terrain.cpp | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 test/test-terrain.cpp

(limited to 'test/test-terrain.cpp')

diff --git a/test/test-terrain.cpp b/test/test-terrain.cpp
new file mode 100644
index 0000000..b2358d6
--- /dev/null
+++ b/test/test-terrain.cpp
@@ -0,0 +1,48 @@
+#define BOOST_TEST_MODULE terrain
+#include <boost/test/unit_test.hpp>
+#include <stream_support.h>
+
+#include <game/terrain2.h>
+
+class TestTerrainMesh : public TerrainMesh {
+public:
+	TestTerrainMesh() : TerrainMesh {FIXTURESDIR "height/SD19.asc"} { }
+};
+
+constexpr size_t ncols = 200, nrows = 200, xllcorner = 310000, yllcorner = 490000, cellsize = 50;
+
+BOOST_FIXTURE_TEST_SUITE(ttm, TestTerrainMesh);
+
+BOOST_AUTO_TEST_CASE(loadSuccess)
+{
+	BOOST_CHECK_EQUAL(ncols * nrows, n_vertices());
+	BOOST_CHECK_EQUAL(2 * (ncols - 1) * (nrows - 1), n_faces());
+}
+
+BOOST_AUTO_TEST_CASE(normalsAllPointUp)
+{
+	BOOST_CHECK(std::all_of(faces_begin(), faces_end(), [this](auto && vh) {
+		return normal(vh).z > 0;
+	}));
+	BOOST_CHECK(std::all_of(vertices_begin(), vertices_end(), [this](auto && vh) {
+		return normal(vh).z > 0;
+	}));
+}
+
+BOOST_AUTO_TEST_CASE(trianglesContainsPoints)
+{
+	const auto face = face_handle(0);
+	auto vertices = cfv_iter(face);
+
+	BOOST_TEST_CONTEXT(point(*vertices++) << point(*vertices++) << point(*vertices++)) {
+		BOOST_CHECK(triangleContainsPoint(glm::vec2 {xllcorner, yllcorner}, face));
+		BOOST_CHECK(triangleContainsPoint(glm::vec2 {xllcorner + cellsize, yllcorner + cellsize}, face));
+		BOOST_CHECK(triangleContainsPoint(glm::vec2 {xllcorner, yllcorner + cellsize}, face));
+		BOOST_CHECK(triangleContainsPoint(glm::vec2 {xllcorner + 1, yllcorner + 1}, face));
+		BOOST_CHECK(triangleContainsPoint(glm::vec2 {xllcorner + 1, yllcorner + 2}, face));
+		BOOST_CHECK(!triangleContainsPoint(glm::vec2 {xllcorner + 3, yllcorner + 2}, face));
+		BOOST_CHECK(!triangleContainsPoint(glm::vec2 {xllcorner + cellsize, yllcorner}, face));
+	}
+}
+
+BOOST_AUTO_TEST_SUITE_END();
-- 
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