public SampleGraphicsScreen(IServiceLocator services)
: base(services.GetInstance<IGraphicsService>())
{
_sampleFramework = services.GetInstance<SampleFramework>();
Name = "SampleScreen";
ClearBackground = false;
BackgroundColor = new Color(220, 220, 220);
DrawReticle = false;
UseFixedWidthFont = false;
// Use 2D texture for reticle.
var contentManager = services.GetInstance<ContentManager>();
_reticle = contentManager.Load<Texture2D>("Reticle");
// Get the sprite fonts used in the UI theme.
var uiContentManager = services.GetInstance<ContentManager>("UIContent");
_defaultFont = uiContentManager.Load<SpriteFont>("UI Themes/BlendBlue/Default");
_fixedWidthFont = uiContentManager.Load<SpriteFont>("UI Themes/BlendBlue/Console");
// Set up 2D camera such that (0, 0) is upper, left corner of screen and
// (screenWidth, screenHeight) is lower, right corner of screen.
var graphicsDevice = GraphicsService.GraphicsDevice;
int screenWidth = graphicsDevice.PresentationParameters.BackBufferWidth;
int screenHeight = graphicsDevice.PresentationParameters.BackBufferHeight;
var projection = new OrthographicProjection
{
Near = 0, Far = 2000,
Left = 0, Right = screenWidth,
Top = 0, Bottom = screenHeight,
};
var camera = new Camera(projection);
_cameraNode2D = new CameraNode(camera)
{
PoseWorld = new Pose(new Vector3F(0, 0, 1000)),
};
// Initialize renderers.
_spriteBatch = new SpriteBatch(graphicsDevice);
_meshRenderer = new MeshRenderer();
_billboardRenderer = new BillboardRenderer(GraphicsService, 2048);
DebugRenderer2D = new DebugRenderer(GraphicsService, _defaultFont)
{
SpriteFont = _defaultFont,
DefaultColor = new Color(0, 0, 0),
DefaultTextPosition = new Vector2F(10)
};
DebugRenderer = new DebugRenderer(GraphicsService, _defaultFont)
{
SpriteFont = _defaultFont,
DefaultColor = new Color(0, 0, 0),
DefaultTextPosition = new Vector2F(10)
};
Scene = new Scene();
}
protected virtual void CloneCore(Camera source)
{
Name = source.Name;
LastProjection = source.LastProjection;
}
private bool _cullingEnabled = true; // True to use frustum culling. False to disable frustum culling.
public FrustumCullingSample(Microsoft.Xna.Framework.Game game)
: base(game)
{
GraphicsScreen.ClearBackground = true;
GraphicsScreen.BackgroundColor = Color.CornflowerBlue;
// The top-down camera.
var orthographicProjection = new OrthographicProjection();
orthographicProjection.Set(
LevelSize * 1.1f * GraphicsService.GraphicsDevice.Viewport.AspectRatio,
LevelSize * 1.1f,
1,
10000f);
var topDownCamera = new Camera(orthographicProjection);
_topDownCameraNode = new CameraNode(topDownCamera)
{
View = Matrix44F.CreateLookAt(new Vector3F(0, 1000, 0), new Vector3F(0, 0, 0), -Vector3F.UnitZ),
};
// The perspective camera moving through the scene.
var perspectiveProjection = new PerspectiveProjection();
perspectiveProjection.SetFieldOfView(
MathHelper.ToRadians(45),
GraphicsService.GraphicsDevice.Viewport.AspectRatio,
1,
500);
var sceneCamera = new Camera(perspectiveProjection);
_sceneCameraNode = new CameraNode(sceneCamera);
// Initialize collision detection.
// We use one collision domain that manages all objects.
_domain = new CollisionDomain(new CollisionDetection())
{
// We exchange the default broad phase with a DualPartition. The DualPartition
// has special support for frustum culling.
BroadPhase = new DualPartition<CollisionObject>(),
};
// Create a lot of random objects and add them to the collision domain.
RandomHelper.Random = new Random(12345);
for (int i = 0; i < NumberOfObjects; i++)
{
// A real scene consists of a lot of complex objects such as characters, vehicles,
// buildings, lights, etc. When doing frustum culling we need to test each objects against
// the viewing frustum. If it intersects with the viewing frustum, the object is visible
// from the camera's point of view. However, in practice we do not test the exact object
// against the viewing frustum. Each objects is approximated by a simpler shape. In our
// example, we assume that each object is approximated with an oriented bounding box.
// (We could also use an other shape, such as a bounding sphere.)
// Create a random box.
Shape randomShape = new BoxShape(RandomHelper.Random.NextVector3F(1, 10));
// Create a random position.
Vector3F randomPosition;
randomPosition.X = RandomHelper.Random.NextFloat(-LevelSize / 2, LevelSize / 2);
randomPosition.Y = RandomHelper.Random.NextFloat(0, 2);
randomPosition.Z = RandomHelper.Random.NextFloat(-LevelSize / 2, LevelSize / 2);
// Create a random orientation.
QuaternionF randomOrientation = RandomHelper.Random.NextQuaternionF();
// Create object and add it to collision domain.
var geometricObject = new GeometricObject(randomShape, new Pose(randomPosition, randomOrientation));
var collisionObject = new CollisionObject(geometricObject)
{
CollisionGroup = 0,
};
_domain.CollisionObjects.Add(collisionObject);
}
// Per default, the collision domain computes collision between all objects.
// In this sample we do not need this information and disable it with a collision
// filter.
// In a real application, we would use this collision information for rendering,
// for example, to find out which lights overlap with which meshes, etc.
var filter = new CollisionFilter();
// Disable collision between objects in collision group 0.
filter.Set(0, 0, false);
_domain.CollisionDetection.CollisionFilter = filter;
// Start with the scene camera.
GraphicsScreen.CameraNode = _sceneCameraNode;
// We will collect a few statistics for debugging.
Profiler.SetFormat("NoCull", 1000, "Time in ms to submit DebugRenderer draw jobs without frustum culling.");
Profiler.SetFormat("WithCull", 1000, "Time in ms to submit DebugRenderer draw jobs with frustum culling.");
}