protected override void Initialise()
{
//draw target camera.
Camera3D camera = new Camera3D();
camera.LookAt(Vector3.Zero, new Vector3(0, 0, 4), Vector3.UnitY);
//create the draw target texture
//actual graphics resources are not created yet...
drawToTexture = new DrawTargetTexture2D(camera, 128, 128, SurfaceFormat.Color, DepthFormat.Depth24Stencil8);
//make the texture clear colour different from the screen, so it's more obvious
drawToTexture.ClearBuffer.ClearColour = Color.WhiteSmoke;
//add a sphere from tutorial 03 to the texture
drawToTexture.Add(new Tutorial_03.SphereDrawer(Vector3.Zero));
Vector2 sizeInPixels = new Vector2(512, 512);
//NEW CODE
//create the helper element, but don't give it a texture yet..
displayElement = new TexturedElement(sizeInPixels);
//create the drawToScreen object..
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//add the helper element to the screen
drawToScreen.Add(displayElement);
}
protected override void Initialise()
{
//draw targets usually need a camera.
Camera3D camera = new Camera3D();
//look at the sphere, which will be at 0,0,0
camera.LookAt(Vector3.Zero, new Vector3(0, 0, 4), Vector3.UnitY);
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create the sphere
SphereDrawer sphere = new SphereDrawer(Vector3.Zero);
//before adding the sphere, add a rect over half the background to show blending is active
//element covers half the screen
SolidColourElement element = new SolidColourElement(Color.DarkGray, new Vector2(0.5f, 1), true);
//element is added before the sphere (so it draws first)
drawToScreen.Add(element);
//add it to be drawn to the screen
drawToScreen.Add(sphere);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
Camera3D camera = new Camera3D();
camera.LookAt(Vector3.Zero, new Vector3(0, 0, 5), Vector3.UnitY);
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create a shader to display the geometry (this is the same as tutorial 02)
Vector3 lightDirection = new Vector3(1.0f, 0.5f, 0.5f);
MaterialShader material = new MaterialShader(new MaterialLightCollection());
material.UsePerPixelSpecular = true;
material.Lights.AmbientLightColour = Color.CornflowerBlue.ToVector3() * 0.5f; //set the ambient
material.Lights.AddDirectionalLight(true, lightDirection, Color.Gray); //add the first of two light sources
material.Lights.AddDirectionalLight(true, -lightDirection, Color.DarkSlateBlue);
material.SpecularColour = Color.LightYellow.ToVector3(); //give the material a nice sheen
//create a simpler shader to display the wireframe (and also used for the bounding cube)
Xen.Ex.Shaders.FillSolidColour simpleShader = new Xen.Ex.Shaders.FillSolidColour();
simpleShader.FillColour = Vector4.One * 0.01f;
Vector3 sphereSize = new Vector3(0.5f, 0.5f, 0.5f);
//create the complex sphere, this will have ~100k triangles.
//pass in a shader for wireframe rendering
sphere = new GeometryDrawer(new Xen.Ex.Geometry.Sphere(sphereSize, 200), material, simpleShader);
//create the bounding cube
sphereBoundingBox = new GeometryDrawer(new Xen.Ex.Geometry.Cube(sphereSize), simpleShader, null);
//create the occluding cube, and position it close to the camera
cube = new GeometryDrawer(new Xen.Ex.Geometry.Cube(Vector3.One), material, null);
cube.position = new Vector3(0, 0, 2.75f);
//add the cube first (so it can draw first, potentially occluding the sphere)
//if the cube was added second, it would have no effect, as it would draw after the sphere
drawToScreen.Add(cube);
//create the predicate, passing in the sphere and bounding box
Xen.Ex.Scene.DrawPredicate predicate = new Xen.Ex.Scene.DrawPredicate(sphere, sphereBoundingBox);
//add the DrawPredicate (the DrawPredicate draws it's children)
drawToScreen.Add(predicate);
//statistic overlay
statOverlay = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
drawToScreen.Add(statOverlay);
}
//NEW CODE
protected override void Initialise()
{
//draw targets usually need a camera.
Camera3D camera = new Camera3D();
//look at the sphere, which will be at 0,0,0
camera.LookAt(Vector3.Zero, new Vector3(0, 0, 4), Vector3.UnitY);
//create the draw target texture in the same way the DrawSphere sample created the draw target screen
//creates a 128x128 texture (the pixelation should be visible)
drawToTexture = new DrawTargetTexture2D(camera, 128, 128, SurfaceFormat.Color, DepthFormat.Depth24Stencil8);
//make the texture clear colour different from the screen, so it's more obvious
drawToTexture.ClearBuffer.ClearColour = Color.WhiteSmoke;
//create the sphere (reused from Tutorial_03)
Tutorial_03.SphereDrawer sphere = new Tutorial_03.SphereDrawer(Vector3.Zero);
//Note, the sphere is added to the drawToTexture, not the drawToScreen
drawToTexture.Add(sphere);
//now, create the drawToScreen object..
//The same camera is being used, although it doesn't have to be.
//The 2D element helper class that will be used will automatically push it's own 2D Camera when
//drawing, to keep itself consistent.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
Vector2 sizeInPixels = new Vector2(512, 512);
//Now create a 2D helper element that will display the texture on screen
Xen.Ex.Graphics2D.TexturedElement displayTexture = null;
//this helper class can directly take a DrawTargetTexture2D as a texture parameter.
//This saves some effort here.
//drawToTexture's Texture2D can be accessed with drawToTexture.GetTexture(),
//in a similar way to XNA render targets.
//However, at this point, drawToTexture.GetTexture() will be null - as the draw
//target has yet to be drawn to.
//drawToTexture.Warm() can be called, which will create the resources now.
//However calling Warm() doesn't totally solve the problem because the texture
//will change when content needs reloading (this happens after a device reset, etc)
//The 2D helper element takes care of this itself.
//Content loading/reloading and dealing with GetTexture() will be covered in the next example.
//for now, the helper class will handle things.
displayTexture = new TexturedElement(drawToTexture, sizeInPixels);
//add it to the screen
drawToScreen.Add(displayTexture);
}
protected override void Initialise()
{
//create the draw target.
drawToScreen = new DrawTargetScreen(this, new Camera3D());
//create the image displayer, passing in a reference
//to the ContentRegister for this Application instance
ImageDisplayer imageDisplayer = new ImageDisplayer(this.Content);
//add it to the screen
drawToScreen.Add(imageDisplayer);
}
//This method gets called just before the window is shown, and the device is created
protected override void Initialise()
{
//draw targets usually need a camera.
//create a 3D camera with default parameters
Camera3D camera = new Camera3D();
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
//Set the screen clear colour to blue
//(Draw targets have a built in ClearBuffer object)
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
}
protected override void Initialise()
{
//create the draw target.
drawToScreen = new DrawTargetScreen(this, new Camera2D());
//create the logo
this.xenLogo = new Xen.Logo.XenLogo(this);
//test xenLogo.EffectFinished to determine if the effect has completed.
//add it to the screen
this.drawToScreen.Add(xenLogo);
}
protected override void Initialise()
{
Camera3D camera = new Camera3D();
camera.LookAt(new Vector3(0, 0, 4), new Vector3(3, 4, 4), new Vector3(0, 0, 1));
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//NEW CODE
//create the actor instance
drawToScreen.Add(new Actor(this.Content));
}
protected override void Initialise()
{
Camera3D camera = new Camera3D();
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//NEW CODE
//create the CameraOrbit object..
//pass in the application update manager
cameraOrbit = new CameraOrbit(camera, this.UpdateManager);
//create the actor instance from Tutorial_10
drawToScreen.Add(new Tutorial_10.Actor(this.Content, Vector3.Zero));
}
protected override void Initialise()
{
Camera3D camera = new Camera3D();
camera.LookAt(Vector3.Zero, new Vector3(0, 0, 4), Vector3.UnitY);
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create the sphere
SphereDrawer sphere = new SphereDrawer(Vector3.Zero);
//add it to be drawn to the screen
drawToScreen.Add(sphere);
}
protected override void Initialise()
{
//draw targets usually need a camera.
Camera3D camera = new Camera3D();
//look at the sphere, which will be at 0,0,0. Look from 0,0,4
camera.LookAt(Vector3.Zero, new Vector3(0, 0, 4), Vector3.UnitY);
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create the sphere at 0,0,0
SphereDrawer sphere = new SphereDrawer(Vector3.Zero);
//add it to be drawn to the screen
drawToScreen.Add(sphere);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
//create the draw target.
drawToScreen = new DrawTargetScreen(this, new Camera2D());
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create the GameStateManager
GameStateManager manager = new GameStateManager(this);
//add it to the screen, and to be updated
this.drawToScreen.Add(manager);
this.UpdateManager.Add(manager);
stats = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
this.drawToScreen.Add(stats);
}
protected override void Initialise()
{
Camera2D camera = new Camera2D();
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.Black;
// uncomment this to force theparticle system to run on the CPU
// Note: This property is not available on the xbox.
//ParticleSystem.ForceUseCpuParticleSystem = true;
// Use ParticleSystem.SystemSupportsGpuParticles to determine if the particle
// system will be run on the GPU
//
// NOTE: When running on the GPU, the particle system will be processed in 16bit floating point
// The CPU particle system is not supported on the Xbox.
//NEW CODE
//create the particle system
this.particles = new ParticleSystem(this.UpdateManager);
//Like ModelInstance, the ParticleSystem content must be assigned before it can be drawn
//create the particle drawer,
//In this case, use a VelocityBillboardParticles2DElement.
//This is a special particle drawer that will 'stretch' particles in the direction they are
//travelling - giving them a streaky look.
//
particleDrawer = new Xen.Ex.Graphics.Display.VelocityBillboardParticles2DElement(this.particles, true);
//align the drawer to the bottom centre of the screen
particleDrawer.VerticalAlignment = VerticalAlignment.Bottom;
particleDrawer.HorizontalAlignment = HorizontalAlignment.Centre;
//add it to ths screen
drawToScreen.Add(particleDrawer);
}
protected override void Initialise()
{
Camera3D camera = new Camera3D();
camera.LookAt(new Vector3(0, 0, 4), new Vector3(3, 4, 4), new Vector3(0, 0, 1));
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create the actor
actor = new Actor(this.Content, this.UpdateManager);
drawToScreen.Add(actor);
text = new TextElement();
text.Position = new Vector2(30, -30); // text is aligned to the top left by default
drawToScreen.Add(text);
}
protected override void Initialise()
{
Camera3D camera = new Camera3D();
camera.LookAt(new Vector3(0, 1, 0), new Vector3(0.5f, 1, -1), new Vector3(0, 1, 0));
camera.Projection.NearClip = 0.1f;
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//create the avatar instance
drawToScreen.Add(new Avatar(this.Content, this.UpdateManager));
#if XBOX
text = new TextElement(@"Press 'A' to display a new Avatar" + Environment.NewLine + "Press 'B' to play the 'Cheer' animation.");
#else
text = new TextElement(@"Unfortunately, avatars are only supported on the XBOX...." + Environment.NewLine + "AvatarInstance will display a wireframe of an avatar skeleton, using any FBX imported animations." + Environment.NewLine + "XNA preset animations cannot be displayed in this wireframe mode.");
#endif
text.Position = new Vector2(50, -50);
drawToScreen.Add(text);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
//draw targets usually need a camera.
Xen.Ex.Camera.FirstPersonControlledCamera3D camera = new Xen.Ex.Camera.FirstPersonControlledCamera3D(this.UpdateManager);
//don't allow the camera to move
camera.MovementSensitivity *= 0;
camera.Position = new Vector3(0, 5, 0);
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = new Color(64, 64, 64);
//create the particle system
this.particles = new ParticleSystem(this.UpdateManager);
//the snow particles will be drawn as velocity particles
this.snowDrawer = new Xen.Ex.Graphics.Display.VelocityBillboardParticles3D(this.particles, false, 0.1f);
//the fog particles will be drawn as normal billboards
this.fogDrawer = new Xen.Ex.Graphics.Display.BillboardParticles3D(this.particles);
//add a ground plane to show the horizon
drawToScreen.Add(new DarkGroundPlane(new Vector4(0.225f, 0.225f, 0.225f, 1f)));
//add the particles
drawToScreen.Add(fogDrawer);
drawToScreen.Add(snowDrawer);
//Note: The particle drawers are masked in the LoadContent method
//add draw stats
stats = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
drawToScreen.Add(stats);
}
protected override void Initialise()
{
//create the draw target.
drawToScreen = new DrawTargetScreen(this, new Camera3D());
//this element will display some help text
helpDisplay = new TextElement();
helpDisplay.Position = new Vector2(100, -100);
#if XBOX360
helpDisplay.Text.SetText("Use a chatpad to input text!");
#else
helpDisplay.Text.SetText("Use the keyboard to input text!");
#endif
//add it to the screen
drawToScreen.Add(helpDisplay);
//create the text
this.textElement = new TextElementRect(new Vector2(400, 200));
this.textElement.Colour = Color.Yellow;
//align the element to the bottom centre of the screen
this.textElement.VerticalAlignment = VerticalAlignment.Bottom;
this.textElement.HorizontalAlignment = HorizontalAlignment.Centre;
//centre align the text
this.textElement.TextHorizontalAlignment = TextHorizontalAlignment.Centre;
//centre the text in the middle of the 400x200 area of the element
this.textElement.TextVerticalAlignment = VerticalAlignment.Centre;
//add it to the screen
drawToScreen.Add(textElement);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
Camera3D camera = new Xen.Ex.Camera.FirstPersonControlledCamera3D(this.UpdateManager, Vector3.Zero, true);
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.CornflowerBlue;
//NEW CODE
//create a BatchModel, this class stores the ModelData and will draw BatchModelInstances
this.batchModel = new BatchModel();
//NEW CODE
//create a large number of actors (1600)
for (float x = -20; x < 20; x++)
{
for (float y = -20; y < 20; y++)
{
drawToScreen.Add(new Actor(this.batchModel, new Vector3(x * 5, y * 5, -5)));
}
}
//this is the most important bit...
//always add the BatchModel itself to the draw target,
//this should be added *after* all BatchModelInstances have been added
//Note: each time a BatchModelInstance is drawn, it will store it's world matrix in the BatchModel
//If the BatchModel is not drawn, the buffer storing these matrices will not be emptied, and will
//eventually throw an OutOfMemoryException exception.
this.drawToScreen.Add(batchModel);
statistics = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
this.drawToScreen.Add(statistics);
}
protected override void Initialise()
{
//create the camera
Xen.Ex.Camera.FirstPersonControlledCamera3D camera =
new Xen.Ex.Camera.FirstPersonControlledCamera3D(this.UpdateManager, Vector3.Zero);
camera.Projection.FarClip *= 10;
this.camera = camera;
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
//25,000 instances
const int instanceCount = 25000;
const float areaRadius = 500;
//create the mesh instance drawer, (but add it to the screen later)
InstancedMeshGeometry meshDrawer = new InstancedMeshGeometry(instanceCount);
//the instances are added to a StaticBinaryTreePartition, which sorts the items
//into a binary tree, for more efficient culling.
//This class assumes it's children do not move (ie they are static)
Xen.Ex.Scene.StaticBinaryTreePartition sceneTree = new Xen.Ex.Scene.StaticBinaryTreePartition();
//add it to the screen
drawToScreen.Add(sceneTree);
//create the instances
Random random = new Random();
for (int i = 0; i < instanceCount; i++)
{
//create a random position in a sphere
Vector3 position = new Vector3((float)(random.NextDouble() - .5),
(float)(random.NextDouble() - .5),
(float)(random.NextDouble() - .5));
position.Normalize();
position *= (float)Math.Sqrt(random.NextDouble()) * areaRadius;
//create the instance
MeshInstance instance = new MeshInstance(meshDrawer, position);
//add the instance to the StaticBinaryTreePartition
sceneTree.Add(instance);
}
//now add the drawer (instances will be drawn by the StaticBinaryPartition, before the drawer)
drawToScreen.Add(meshDrawer);
//Note that if the StaticBinaryTreePartition was not used, then
//in each frame, every single instance would perform a CullTest to the screen
//CullTests, despite their simplicity can be very costly in large numbers.
//The StaticBinaryTreePartition will usually perform a maximum number of CullTests
//that is approximately ~30% the number of children. (in this case, ~8000 tests)
//At it's best, when it's entirely off or on screen, it will perform only 1 or 2 CullTests.
//The number of cull tests performed will be displayed in debug builds of this tutorial:
//add some statusText to display on screen to show the stats
statusText = new TextElement();
statusText.Position = new Vector2(50, -50);
drawToScreen.Add(statusText);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
//draw targets usually need a camera.
Xen.Ex.Camera.FirstPersonControlledCamera3D camera = new Xen.Ex.Camera.FirstPersonControlledCamera3D(this.UpdateManager, Vector3.Zero, false);
//don't allow the camera to move too fast
camera.MovementSensitivity *= 0.1f;
camera.LookAt(new Vector3(0, 3, 0), new Vector3(1, 5, 10), new Vector3(0, 1, 0));
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = new Color(45, 50, 60);
//create the fire and smoke particle system
this.fireParticleSystem = new ParticleSystem(this.UpdateManager);
this.smokeParticleSystem = new ParticleSystem(this.UpdateManager);
//IMPORTANT
//The following flags are FALSE by default.
//For looping effects, such as the fire and smoke, it's highly
//recommended to enable this flag. Otherwise, while the effect
//is offscreen, the particle system will continue to process.
this.fireParticleSystem.PauseUpdatingWhileCulled = true;
this.smokeParticleSystem.PauseUpdatingWhileCulled = true;
this.drawSorted = new Xen.Ex.Scene.DepthDrawSorter(Xen.Ex.Scene.DepthSortMode.BackToFront);
this.drawUnsorted = new DrawList();
Xen.Ex.Graphics.Display.ParticleDrawer3D fireDrawer = new Xen.Ex.Graphics.Display.VelocityBillboardParticles3D(this.fireParticleSystem, true);
Xen.Ex.Graphics.Display.ParticleDrawer3D smokeDrawer = new Xen.Ex.Graphics.Display.BillboardParticles3D(this.smokeParticleSystem);
for (int i = 0; i < 10; i++)
{
Vector3 position = new Vector3((float)Math.Cos(i * Math.PI / 5.0) * 6.0f, 0, (float)Math.Sin(i * Math.PI / 5.0) * 6.0f);
CullableParticleWrapper fireEffect, smokeEffect;
fireEffect = new CullableParticleWrapper(fireDrawer, position, new Vector3(0, 2, 0), 4);
smokeEffect = new CullableParticleWrapper(smokeDrawer, position, new Vector3(0, 6, 0), 5);
this.drawSorted.Add(fireEffect);
this.drawSorted.Add(smokeEffect);
this.drawUnsorted.Add(fireEffect);
this.drawUnsorted.Add(smokeEffect);
GroundLightDisk light = new GroundLightDisk(position);
this.drawSorted.Add(light);
this.drawUnsorted.Add(light);
}
//setup the burst effect
this.burstParticleSystem = new ParticleSystem(this.UpdateManager);
//for this case, PauseUpdatingWhileCulled is not set to true.
//The particle emitting is culled when offscreen. If set to true,
//Any particles left offscreen could 'pause', when they naturally
//wouldn't be emitted anyway.
//(The particle system will use very few resources when it has no
//active particles)
this.burstSources = new BurstSource[20];
Random rand = new Random();
for (int i = 0; i < this.burstSources.Length; i++)
{
//create the bursts out in the distance
Vector3 position = new Vector3((float)i * 5.0f - this.burstSources.Length * 2.5f, 0, -20);
float radius = 10; // with a decent radius
//give them a random starting time
this.burstSources[i] = new BurstSource(position, radius, (float)rand.NextDouble() * 2);
this.drawSorted.Add(this.burstSources[i]);
this.drawUnsorted.Add(this.burstSources[i]);
}
//the bursts need to be drawn as a group..
ParticleDrawer3D burstDrawer = new Xen.Ex.Graphics.Display.VelocityBillboardParticles3D(this.burstParticleSystem, false, 0.5f);
this.drawSorted.Add(burstDrawer);
this.drawUnsorted.Add(burstDrawer);
//Use all the burst sources to cull the drawer (may not be ideal if there were many sources...)
//Use the particle drawer CullProxy to do it
burstDrawer.CullProxy = new BurstCullProxy(this.burstSources);
//add a ground plane to show the horizon
drawToScreen.Add(new Tutorial_22.DarkGroundPlane(new Vector4(0.125f, 0.15f, 0.135f, 1)));
//add the sorted and unsorted lists
drawToScreen.Add(drawSorted);
drawToScreen.Add(drawUnsorted);
//finally, create a CullTestVisualizer, which will visually show the cull tests performed
cullTestVisualizer = new Xen.Ex.Scene.CullTestVisualizer(this.drawToScreen.Camera);
//the visualizer is added as a draw modifier
this.drawToScreen.AddModifier(cullTestVisualizer);
//add help text
this.text = new TextElement();
this.text.VerticalAlignment = VerticalAlignment.Bottom;
this.text.Position = new Vector2(50, 100);
drawToScreen.Add(this.text);
//add draw stats
stats = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
drawToScreen.Add(stats);
}
protected override void Initialise()
{
//setup ambient lighting
this.ambientLight = new MaterialLightCollection();
ambientLight.LightingEnabled = true;
ambientLight.AmbientLightColour = new Vector3(0.25f, 0.25f, 0.25f);
ambientLight.AddDirectionalLight(false, new Vector3(-1, -1, 0), new Vector3(2, 2, 2)); // add some backlighting
//setup the shadow render camera
Camera3D shadowCamera = new Camera3D();
shadowCamera.LookAt(new Vector3(1, 1, 3), new Vector3(-15, 20, 20), new Vector3(0, 0, 1));
//set the clip plane distances
shadowCamera.Projection.FarClip = 40;
shadowCamera.Projection.NearClip = 20;
shadowCamera.Projection.FieldOfView *= 0.25f;
//8bit is actually enough accuracy for this sample (given the limited range of the shadow)
SurfaceFormat textureFormat = SurfaceFormat.Color;
const int resolution = 512;
//create the shadow map texture:
drawShadowDepth = new DrawTargetTexture2D(shadowCamera, resolution, resolution, textureFormat, DepthFormat.Depth24);
drawShadowDepth.ClearBuffer.ClearColour = Color.White;
//for the shadow technique used, the shadow buffer is blurred.
//this requires an intermediate render target on the PC
DrawTargetTexture2D blurIntermediate = null;
#if !XBOX360
//not required on the xbox if the render target is small enough to fit in EDRAM in one tile
blurIntermediate = new DrawTargetTexture2D(shadowCamera, resolution, resolution, textureFormat);
#endif
//create a blur filter
shadowDepthBlurFilter = new Xen.Ex.Filters.BlurFilter(Xen.Ex.Filters.BlurFilterFormat.SevenSampleBlur, 1.0f, drawShadowDepth, blurIntermediate);
//create the scene camera
Camera3D camera = new Camera3D();
camera.LookAt(new Vector3(0, 0, 3), new Vector3(10, 10, 6), new Vector3(0, 0, 1));
camera.Projection.FieldOfView *= 0.55f;
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
drawToScreen.ClearBuffer.ClearColour = Color.Black;
//the 'scene'
//A DrawList from Tutorial 23 is used here, this stores the 'scene',
//which is just a set of actors and the ground
Tutorials.Tutorial_23.DrawList scene = new Tutorials.Tutorial_23.DrawList();
for (int x = 0; x < 2; x++)
{
for (int y = 0; y < 2; y++)
{
//create the actor instances
if (x != 0 || y != 0)
{
scene.Add(new Actor(this.Content, new Vector3(x * 6 - 3, y * 6 - 3, 0), (x + y * 2 + 1) * 0.1f, 4 - x * 2 - y));
}
}
}
//add the ground
GroundDisk ground = new GroundDisk(this.Content, 10, ambientLight);
scene.Add(ground);
//setup the draw targets...
//create the shader provider
ShadowOutputShaderProvider shadowOutputShaderProvider = new ShadowOutputShaderProvider();
//add a ShadowMapDrawer to the shadow map texture
drawShadowDepth.Add(new ShadowMapDrawer(scene, shadowOutputShaderProvider));
//setup the scene to be drawn to the screen
//draw the scene normally (no shadow, just ambient)
drawToScreen.Add(scene);
//then draw the scene with a shadow (blended on top)
drawToScreen.Add(new ShadowedSceneDrawer(scene, shadowOutputShaderProvider, drawShadowDepth));
//add a nice faded background
Tutorial_20.BackgroundGradient background = new Tutorial_20.BackgroundGradient(Color.WhiteSmoke, Color.Black);
background.DrawAtMaxZDepth = true;
drawToScreen.Add(background);
//create a textured element that will display the shadow map texture
TexturedElement shadowDepthDisplay = new TexturedElement(drawShadowDepth, new Vector2(256, 256));
shadowDepthDisplay.VerticalAlignment = VerticalAlignment.Top;
this.drawToScreen.Add(shadowDepthDisplay);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
camera = new Camera3D();
camera.Projection.FarClip = 300;
camera.Projection.NearClip = 10;
camera.Projection.FieldOfView *= 0.55f;
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
//no need to clear the colour buffer, as a special background will be drawn
drawToScreen.ClearBuffer.ClearColourEnabled = false;
//create the light collection first
lights = new MaterialLightCollection();
// In this example, the rendering order has been manually optimized to reduce the number of pixels drawn
//
// In xen, rendering is usually explicit. This means, when a call to Draw() is made, the draw order is
// respected, and internally the object will be drawn using the graphics API.
// Objects added to the screen will have Draw() called in the order they were added.
//
// However, the draw order can also cause performance problems.
// In general, it's best to draw front to back, this means draw the objects closest to the screen first.
//
// This way, the objects at the back will be drawing behind the objects already drawn.
// Modern video cards can quickly discard pixels if they are 'behind' what is already drawn.
// Without front-to-back, the objects at the front could be drawing *over* objects already drawn.
//
// This is known as overdraw, a case where an object is drawn, only to be 'overdrawn' later in the frame.
// Reducing overdraw can help performance, especially when complex shaders are used.
//
// In this example, the sample is usually vertex-limited (that is, the bottleneck is vertex processing)
// However, it can demonstrate how optimizing for overdraw can significantly reduce the number of pixels
// that are shaded.
//
// In debug builds, the DrawStatisticsDisplay class will show the number of pixels drawn in the frame.
//
// With overdraw optimized draw order, ~1,000,000 pixels are drawn per frame. Without, upto 2,100,000
// pixels are drawn per frame (usually ~1,800,000). (A 1280x720 display has 921,600 pixels)
//
// This means that without an overdraw optimized draw order, on average, each pixel is being drawn
// twice. With an optimized draw order, this number is closer to 1.1, which is very close to the
// optimal value of 1.0 (where each pixel is only drawn once).
//
// Note that the number of pixels reported by the DrawStatisticsDisplay is for the entire frame, including
// every render target. Some PCs may not support this value, and display -1.
//
// One last point....
// This sample is an extreme test of a GPU's ability to push triangles onto the screen (vertex/triangle rate).
// However, observation will show the number of triangles drawn is often over 3,300,000!
// Assuming half the triangles are back-face culled (an accurate approximation), this still means
// there are around 1,650,000 triangles that are visible at any time.
// (But remember, the vertex shader still runs for back facing triangles!)
//
// Assuming approximatly half of these triangles are depth occluded (very approximate), still
// results in a huge number of visible triangles.
// This all means that the average triangle is drawing a *very* small number of pixels, in this case,
// the average for the actors is probably *less than 1 pixel per triangle!*.
//
// Triangles averaging less than 1 pixel are known as subpixel triangles.
// For a number of reasons, subpixel triangles are very inefficent.
// For example, if a single pixel is drawn, due to the way a video card works, the pixel shader will always
// run in multiples of 4 pixels, so a single pixel triangle will still run the pixel shader 4 times.
//
// This makes this sample a perfect candidate for level of detail optimization, where a lower resolution
// model is used as an actor gets further away from the screen.
//
// The vertex shader is also very expensive, and for each triangle, it will be run upto 3 times.
// This means the vertex shader is quite possibly running more often than the pixel shader.
// This hypothesis can be confirmed; setting the lights to per-vertex, instead of per-pixel, results
// in a significantly *lower* frame rate!
//
//
//
bool optimizeForOverdraw = true;
//create a list of actors to added to the screen
List <Actor> actors = new List <Actor>(500);
//create 500 actors!
for (int i = 0; i < 500; i++)
{
Actor actor = new Actor(this.Content, this.UpdateManager, lights, diskRadius);
actors.Add(actor);
}
//create the lights, similar to Tutorial 14
lights.AmbientLightColour = new Vector3(0.45f, 0.45f, 0.5f);
Vector3[] lightPositions = new Vector3[]
{
new Vector3(0, 30, 12),
new Vector3(0, -30, 12)
};
//setup the two lights in the scene
IDraw lightGeometry = null;
IDraw lightPoleGeometry = null;
//create geometry to display the lights
List <IDraw> lightSourceGeometry = new List <IDraw>();
//setup the lights, and create the light globe geometry
for (int i = 0; i < lightPositions.Length; i++)
{
Vector3 colour = new Vector3(5, 5, 5);
IMaterialPointLight light = lights.AddPointLight(i < 2, lightPositions[i], 8, colour, colour);
light.ConstantAttenuation = 0.25f; // make the ligh falloff curve a lot sharper (brighter at the centre)
light.LinearAttenuation = 0;
light.QuadraticAttenuation = 0.075f; //approximate inverse distance in which the brightness of the light will halve
if (lightGeometry == null)
{
lightGeometry = new Xen.Ex.Geometry.Sphere(Vector3.One, 8, true, false, false);
lightPoleGeometry = new Xen.Ex.Geometry.Cube(new Vector3(0.4f, 0.4f, lightPositions[i].Z * 0.5f));
}
//visually show the light
//create the light sphere geometry from tutorial 14.
Vector3 position = lightPositions[i];
lightSourceGeometry.Add(new Tutorial_14.LightSourceDrawer(position, lightGeometry, Color.LightYellow));
position.Z *= 0.5f;
lightSourceGeometry.Add(new Tutorial_14.LightSourceDrawer(position, lightPoleGeometry, new Color(40, 40, 70)));
}
//create the ground plane, also from tutorial 14
Tutorial_14.GroundDisk ground = new Tutorial_14.GroundDisk(this.Content, lights, diskRadius);
//this is a special background element,
//it draws a gradient over the entire screen, fading from dark at the bottom to light at the top.
Color darkBlue = new Color(40, 40, 50);
Color lightBlue = new Color(100, 100, 110);
BackgroundGradient background = new BackgroundGradient(lightBlue, darkBlue);
if (optimizeForOverdraw == false)
{
//add all the objects in a naive order
//first add the background (fills the entire screen, draws to every pixel, but is very fast)
drawToScreen.Add(background);
//then add the ground plane (all the actors will appear on top of the ground plane, overdrawing it)
drawToScreen.Add(ground);
//then add the lights (which are on top of the ground, overdrawing it)
foreach (IDraw geometry in lightSourceGeometry)
{
drawToScreen.Add(geometry);
}
//then finally add the actors, in the order they were created
foreach (Actor actor in actors)
{
drawToScreen.Add(actor);
}
}
else
{
//or, add the objects in a order optimized for overdraw
#if !XBOX360
//first, add the actors. Because they are almost always closest to the screen
//however, use a depth sorter so the actors are sorted into a front to back draw order,
//this sorting is based on the centre point of the cull tests they perform.
Xen.Ex.Scene.DepthDrawSorter sorter = new Xen.Ex.Scene.DepthDrawSorter(Xen.Ex.Scene.DepthSortMode.FrontToBack);
//Remember, the objects placed in the sorter *must* perform a valid CullTest,
//if the CullTest simply returns true/false, no sorting will occur.
//(Note the Actor.CullTest method)
//to ease the CPU load, have the sorter only sort the actors every few frames...
sorter.SortDelayFrameCount = 5;
foreach (Actor actor in actors)
{
sorter.Add(actor); // add the actors to the sorter (not the screen)
}
//the sorter itself must be added to the screen!
drawToScreen.Add(sorter); // the sorter will then draw the actors in a sorted order
#else
//In this case (on the Xbox), because the application is heavily vertex limited
//and already heavily CPU stretched by the animation system, the cost of
//sorting the actors actually causes a larger performance hit on the CPU than
//the time saved on the GPU. This inballance causes a frame rate drop.
//
//However, the reason for this may be unexpected.
//The framerate drop is not caused by the overhead of sorting the actors.
//
//Any 3D API calls made are doubly expensive on the XBOX, so in order to
//maintain 20fps in this sample, the primary (rendering) thread must not
//block, or switch to task processing.
//If it does so, valuable rendering time is lost.
//
//When using a sorter, the actors are drawn in an order that is constantly changing.
//However, they always have Update() called in a consistent order.
//
//During Update() the actors animation controllers will spawn thread tasks to
//process their animation.
//
//These tasks are processed on the three spare xbox hardware threads, they are
//processed in the order they were added.
//Processing the animation usually completes before the rendering finishes.
//(the rendering is not delayed waiting for the animation to finish).
//
//However, when sorting the actors get drawn in an unpredictable order,
//this means the last actor added could be the first actor to draw,
//in such a case, the chances of it's animation processing having completed
//is *very* low. When this happens, the rendering thread has to switch to
//processing animations, delaying rendering.
//
//So, for the xbox, it's best just to draw in the update order.
foreach (Actor actor in actors)
{
drawToScreen.Add(actor);
}
#endif
//add the light source geometry, as they are usually below the actors, but above the ground
foreach (IDraw geometry in lightSourceGeometry)
{
drawToScreen.Add(geometry);
}
//then add the ground plane, which is usually below the actors and lights.
drawToScreen.Add(ground);
//finally, enable a special feature of ElementRect.
//This makes the element draw at the maximum possible Z distance
//(behind anything else that has been drawn)
background.DrawAtMaxZDepth = true;
//add it to the screen
drawToScreen.Add(background);
}
//finally,
//create the draw statistics display
stats = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
drawToScreen.Add(stats);
}
protected override void Initialise()
{
camera = new Camera3D();
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
//clear to dark blue
drawToScreen.ClearBuffer.ClearColour = new Color(20, 20, 40);
//create the light collection
lights = new MaterialLightCollection();
//set a dark blue ambient colour
lights.AmbientLightColour = new Color(40, 40, 80).ToVector3();
//positions for two lights
Vector3[] lightPositions = new Vector3[]
{
new Vector3(0, 30, 2),
new Vector3(0, -30, 2)
};
//geometry for a light (shared for each light)
IDraw lightGeometry = null;
for (int i = 0; i < lightPositions.Length; i++)
{
float lightHalfFalloffDistance = 15;
Color lightColor = Color.LightYellow;
Color lightSpecularColour = Color.WhiteSmoke;
bool perPixel = i < 2; //first two lights are per-pixel
//interface to the light about to be created
IMaterialPointLight light = null;
//create the point light
light = lights.AddPointLight(perPixel, lightPositions[i], lightHalfFalloffDistance, lightColor, lightSpecularColour);
//adjust the lighting attenuation model, the constant defaults to 1, which prevents the light being brighter than 1.0 in the falloff equation
//set to 0.25, the light will get really bright in close (up to 4)
//(see light.QuadraticAttenuation remarks for an explanation of the falloff model)
light.ConstantAttenuation = 0.25f;
//create the light geometry (a sphere)
if (lightGeometry == null)
{
lightGeometry = new Xen.Ex.Geometry.Sphere(Vector3.One, 8, true, false, false);
}
//visually show the light with a light drawer
IDraw lightSourceDrawer = new LightSourceDrawer(lightPositions[i], lightGeometry, lightColor);
//add the light geometry to the screen
drawToScreen.Add(lightSourceDrawer);
}
//create the ground disk
GroundDisk ground = new GroundDisk(this.Content, lights, diskRadius);
//then add it to the screen
drawToScreen.Add(ground);
}
protected override void Initialise()
{
Resource.EnableResourceTracking();
//setup the view camera first
//--------------------------------------
viewCamera = new Xen.Ex.Camera.FirstPersonControlledCamera3D(this.UpdateManager);
viewCamera.Projection.FieldOfView *= 0.65f;
viewCamera.MovementSensitivity *= 0.05f;
viewCamera.LookAt(new Vector3(-3, 4, 2), new Vector3(6, 6, 2), new Vector3(0, 1, 0));
viewCamera.Projection.NearClip = 0.1f;
//shadow map setup:
//--------------------------------------
const float shadowArea = 4;
const int shadowMapResolution = 1024;
//setup the shadow map rendering camera
shadowCamera = new Camera3D();
//setup the shadow map projection to roughly cover the character
shadowCamera.Projection.Orthographic = true;
shadowCamera.Projection.NearClip = shadowArea * 2;
shadowCamera.Projection.FarClip = -shadowArea * 2;
shadowCamera.Projection.Region = new Vector4(1, -1.8f, -1, 0.2f) * shadowArea;
//setup the shadow map draw target
//find a desirable format for the shadow map,
SurfaceFormat format = SurfaceFormat.Color;
//ideally use a high precision format, but only if it's supported. Avoid full 32bit float
if (DrawTargetTexture2D.SupportsFormat(SurfaceFormat.Rg32))
{
format = SurfaceFormat.Rg32; //ushort * 2
}
else if (DrawTargetTexture2D.SupportsFormat(SurfaceFormat.HalfVector2))
{
format = SurfaceFormat.HalfVector2; //fp16 * 2
}
else if (DrawTargetTexture2D.SupportsFormat(SurfaceFormat.HalfVector4))
{
format = SurfaceFormat.HalfVector4; //fp16 * 4
}
//create the shadow map
shadowMap = new DrawTargetTexture2D(shadowCamera, shadowMapResolution, shadowMapResolution, format, DepthFormat.Depth24);
shadowMap.ClearBuffer.ClearColour = Color.White;
//setup the shadow map drawer..
shadowDrawer = new Tutorial_25.ShadowMapDrawer(null, new Tutorial_25.ShadowOutputShaderProvider());
this.shadowMap.Add(shadowDrawer);
//create the main draw targets.
//--------------------------------------
drawToScreen = new DrawTargetScreen(this, new Camera2D());
drawToScreen.ClearBuffer.ClearColourEnabled = false;
drawToRenderTarget = new DrawTargetTexture2D(viewCamera, this.WindowWidth, this.WindowHeight, SurfaceFormat.Color, DepthFormat.Depth24Stencil8, false, MultiSampleType.FourSamples, RenderTargetUsage.PlatformContents);
drawToRenderTarget.ClearBuffer.ClearColourEnabled = false;
//setup the bloom draw targets
//--------------------------------------
//scale to reduce the size of the bloom target, compared to main render target
const int bloomDownsample = 8; //eight times smaller
bloomRenderTarget = new DrawTargetTexture2D(new Camera2D(), Math.Max(1, drawToRenderTarget.Width / bloomDownsample), Math.Max(1, drawToRenderTarget.Height / bloomDownsample), SurfaceFormat.Color);
bloomRenderTarget.ClearBuffer.ClearColourEnabled = false;
bloomIntermediateRenderTarget = null;
#if WINDOWS
//the bloom intermediate target is not needed on the xbox, as the full bloom target fits in EDRAM
bloomIntermediateRenderTarget = new DrawTargetTexture2D(viewCamera, bloomRenderTarget.Width, bloomRenderTarget.Height, SurfaceFormat.Color);
bloomIntermediateRenderTarget.ClearBuffer.ClearColourEnabled = false;
#endif
//setup the blur filter, with a large 31 sample radius.
bloomBlurPass = new Xen.Ex.Filters.BlurFilter(Xen.Ex.Filters.BlurFilterFormat.ThirtyOneSampleBlur_FilteredTextureFormat, 1.0f, bloomRenderTarget, bloomIntermediateRenderTarget);
//setup the character model
this.model = new ModelInstance(); //(the model is setup in LoadContent)
this.modelRotation = new DrawRotated(model);
this.modelRotation.RotationAngle = 3;
//add the model to be drawn
drawToRenderTarget.Add(modelRotation);
//setup the shaders
this.characterRenderShader = new Shaders.Character();
this.characterBlendRenderShader = new Shaders.CharacterBlend();
//setup the output and bloom shaders
outputShader = new Shaders.RgbmDecode();
drawToScreen.Add(new ShaderElement(outputShader, new Vector2(1, 1), true));
bloomPassShader = new Shaders.RgbmDecodeBloomPass();
bloomRenderTarget.Add(new ShaderElement(bloomPassShader, new Vector2(1, 1), true));
//add a background to be drawn
drawToRenderTarget.Add(new BackgroundDrawer());
//setup the debug image displays
//--------------------------------------
this.rgmbTextureAlphaShader = new Shaders.AlphaWrite();
this.bloomTextureDisplay = new TexturedElement(this.bloomRenderTarget, new Vector2(0.2f, 0.2f), true);
this.rgbmTextureDisplay = new TexturedElement(this.drawToRenderTarget, new Vector2(0.2f, 0.2f), true);
this.rgbmTextureAlphaDisplay = new ShaderElement(this.rgmbTextureAlphaShader, new Vector2(0.2f, 0.2f), true);
this.rgbmTextureAlphaDisplay.Position = new Vector2(0.7f, 0.2f);
this.rgbmTextureDisplay.Position = new Vector2(0.7f, 0.4f);
this.bloomTextureDisplay.Position = new Vector2(0.7f, 0.6f);
this.drawToScreen.Add(this.rgbmTextureDisplay);
this.drawToScreen.Add(this.rgbmTextureAlphaDisplay);
this.drawToScreen.Add(this.bloomTextureDisplay);
//setup the render config
this.configEditor = new RenderConfigEditor(this.Content);
this.drawToScreen.Add(configEditor);
this.UpdateManager.Add(configEditor);
//add a statistics overlay.
drawStats = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
drawToScreen.Add(drawStats);
}
protected override void Initialise()
{
//DrawStatisticsDisplay requires that resource tracking is enabled
Resource.EnableResourceTracking();
//Xen.Ex provides a very useful Camera3D called 'FirstPersonControlledCamera3D'.
//This camera uses player input to act as a simple first-person style flythrough camera
Xen.Ex.Camera.FirstPersonControlledCamera3D camera = null;
//it uses player input, so the UpdateManager must be passed in
camera = new Xen.Ex.Camera.FirstPersonControlledCamera3D(this.UpdateManager);
//in this case, we want the z-axis to be the up/down axis (otherwise it's the Y-axis)
camera.ZAxisUp = true;
//also it's default is a bit too fast moving
camera.MovementSensitivity *= 0.1f;
camera.LookAt(new Vector3(1, 0, 0), new Vector3(), new Vector3(0, 0, 1));
this.camera = camera;
//create the draw target.
drawToScreen = new DrawTargetScreen(this, camera);
//create a large number of actor instance from tutorial 10..
for (int n = 0; n <= 16; n++)
{
//create in a half circle
float angle = (n / 16.0f) * MathHelper.Pi;
Vector3 position = new Vector3((float)Math.Sin(angle), (float)Math.Cos(angle), 0);
//not too close together
position *= 10;
drawToScreen.Add(new Tutorial_10.Actor(this.Content, position));
}
//this element will display the camera position
positionDisplay = new TextElement();
//TextElement (unlike other Elements) defaults to Top Left alignment
//So, in order to bring it closer to the centre of the screen (due to potential overscan)
//it's position needs to be set 'right' and 'down' from 'top left'
//(this is just an example, see XNA docs for correct overscan compensation behaviour)
positionDisplay.Position = new Vector2(40, -40); //offset from top left corner alignment
//add it to the screen
drawToScreen.Add(positionDisplay);
Vector2 sizeInPixels = new Vector2(400, 200);
//create the main block of yellow text
this.yellowElement = new TextElementRect(sizeInPixels);
this.yellowElement.Colour = Color.Yellow;
//first line of text... this will have a flashing 2D element embedded
string embeddedText = @"This is a text box with a large amount of custom text! It also includes an embedded 2D element: , which is a 16x16 SolidColourElement";
uint insertAtIndex = 96; // Hard coded to insert a 2D element at character index 96 which is about here: ^
//add a bunch of text...
this.yellowElement.Text.AppendLine(embeddedText);
this.yellowElement.Text.AppendLine();
this.yellowElement.Text.AppendLine(@"This class is:");
this.yellowElement.Text.AppendLine(this.GetType().FullName);
this.yellowElement.Text.AppendLine(@"It is located in assembly:");
this.yellowElement.Text.AppendLine(this.GetType().Assembly.FullName);
this.yellowElement.Text.AppendLine();
//add an embedded 2D element within the text
//create it..
this.embeddedElement = new SolidColourElement(Color.Red, new Vector2(16, 16)); // quite small
this.embeddedElement.AlphaBlendState = AlphaBlendState.Alpha;
//add it.
this.yellowElement.AddInline(this.embeddedElement, insertAtIndex);
#if XBOX360
this.yellowElement.Text.AppendLine(@"Press and hold both thumbsticks to show the debug overlay");
#else
this.yellowElement.Text.AppendLine(@"Press F12 to show the debug overlay");
#endif
//align the element rectangle to the bottom centre of the screen
this.yellowElement.VerticalAlignment = VerticalAlignment.Bottom;
this.yellowElement.HorizontalAlignment = HorizontalAlignment.Centre;
//centre align the text
this.yellowElement.TextHorizontalAlignment = TextHorizontalAlignment.Centre;
//centre the text in the middle of the 400x200 area of the element rectangle
this.yellowElement.TextVerticalAlignment = VerticalAlignment.Centre;
//add it to the screen
drawToScreen.Add(yellowElement);
//create the statistics display
//this class will query the DrawState for the previous frames DrawStatistics structure.
//this structure provides a large number of statistics for the drawn frame.
//The DrawStatisticsDisplay displays some of the more important statistics. It will also
//display thread activity on the xbox.
//DrawStatistics are only available in DEBUG xen builds
//They can be accessed at runtime with DrawState GetPreviousFrameStatistics()
//at runtime, pressing 'F12' will toggle the overlay (or holding both thumbsticks on x360)
this.statisticsOverlay = new Xen.Ex.Graphics2D.Statistics.DrawStatisticsDisplay(this.UpdateManager);
//As of xen 1.5, by default the DrawStatisticsDisplay displays a significantly reduced number of graphs.
//To display the full set of graphs (which generally takes up the entire screen), set the following
//property to 'true':
//this.statisticsOverlay.DisplayFullGraphList = true;
//then add it to the screen
drawToScreen.Add(statisticsOverlay);
}