Differential D1927 Diff 8208 ps/trunk/source/graphics/tests/test_Camera.h

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ps/trunk/source/graphics/tests/test_Camera.h

				/* Copyright (C) 2019 Wildfire Games.
				* This file is part of 0 A.D.
				*
				* 0 A.D. is free software: you can redistribute it and/or modify
				* it under the terms of the GNU General Public License as published by
				* the Free Software Foundation, either version 2 of the License, or
				* (at your option) any later version.
				*
				* 0 A.D. 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 General Public License for more details.
				*
				* You should have received a copy of the GNU General Public License
				* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
				*/

				#include "lib/self_test.h"

				#include "graphics/Camera.h"
				#include "maths/MathUtil.h"
				#include "maths/Vector3D.h"

				#include <vector>

				class TestCamera : public CxxTest::TestSuite
				{
				public:
				void test_frustum_perspective()
				{
				SViewPort viewPort;
				viewPort.m_X = 0;
				viewPort.m_Y = 0;
				viewPort.m_Width = 512;
				viewPort.m_Height = 512;

				CCamera camera;
				camera.SetViewPort(viewPort);
				camera.LookAlong(
				CVector3D(0.0f, 0.0f, 0.0f),
				CVector3D(0.0f, 0.0f, 1.0f),
				CVector3D(0.0f, 1.0f, 0.0f)
				);
				camera.SetProjection(1.0f, 101.0f, DEGTORAD(90.0f));
				camera.UpdateFrustum();

				const float sqrt2 = sqrtf(2.0f) / 2.0f;
				const std::vector<CPlane> expectedPlanes = {
				CVector4D(sqrt2, 0.0f, sqrt2, 0.0f),
				CVector4D(-sqrt2, 0.0f, sqrt2, 0.0f),
				CVector4D(0.0f, sqrt2, sqrt2, 0.0f),
				CVector4D(0.0f, -sqrt2, sqrt2, 0.0f),
				CVector4D(0.0f, 0.0f, -1.0f, 101.0f),
				CVector4D(0.0f, 0.0f, 1.0f, -1.0f),
				};
				CheckFrustumPlanes(camera.GetFrustum(), expectedPlanes);
				}

				// Order of planes is unknown. So use interactive checker.
				void CheckFrustumPlanes(const CFrustum& frustum, const std::vector<CPlane>& expectedPlanes)
				{
				TS_ASSERT_EQUALS(frustum.GetNumPlanes(), expectedPlanes.size());
				std::set<size_t> indices;
				for (size_t i = 0; i < expectedPlanes.size(); ++i)
				indices.insert(i);

				for (size_t i = 0; i < frustum.GetNumPlanes(); ++i)
				{
				bool found = false;
				for (size_t j : indices)
				{
				if (EqualPlanes(frustum[i], expectedPlanes[j]))
				{
				found = true;
				indices.erase(j);
				break;
				}
				}
				TS_ASSERT(found);
				}
				}

				bool EqualPlanes(const CPlane& p1, const CPlane& p2) const
				{
				const float EPS = 1e-3f;
				if (std::fabsf(p1.m_Dist - p2.m_Dist) >= EPS)
				return false;
				return
				std::fabsf(p1.m_Norm.X - p2.m_Norm.X) < EPS &&
				std::fabsf(p1.m_Norm.Y - p2.m_Norm.Y) < EPS &&
				std::fabsf(p1.m_Norm.Z - p2.m_Norm.Z) < EPS;
				}
				};