private void UpdateCubeMap(TimeSpan deltaTime)
{
if (_cloudMapRenderer == null)
{
// This is the first call of UpdateCubeMap. Create the renderers which
// we need to render the cube map.
// The CloudMapRenderer creates and animates the LayeredCloudMaps.
_cloudMapRenderer = new CloudMapRenderer(_graphicsService);
// The SkyRenderer renders SkyNodes.
_skyRenderer = new SkyRenderer(_graphicsService);
// We use a ColorEncoder to encode a HDR image in a normal Color texture.
_colorEncoder = new ColorEncoder(_graphicsService)
{
SourceEncoding = ColorEncoding.Rgb,
TargetEncoding = SkyboxNode.Encoding,
};
// The SceneCaptureRenderer handles SceneCaptureNodes. We need to specify
// a render callback which is called in SceneCaptureNode.Render().
_sceneCaptureRenderer = new SceneCaptureRenderer(RenderSky);
// Normally, the render context is managed by the graphics service.
// When we call renderer outside of a GraphicsScreen, we have to use our
// own context instance.
_context = new RenderContext(_graphicsService);
}
// Update render context. For off-screen rendering we must at least update
// the time properties (e.g. for cloud animations).
_context.DeltaTime = deltaTime;
_context.Time += deltaTime;
_context.Frame++;
// Create cloud maps.
_cloudMapRenderer.Render(_skyGroupNode.Children, _context);
// Capture sky in cube map.
_sceneCaptureRenderer.Render(_sceneCaptureNode, _context);
}
// Renders the graphics screen. - This method is called in GraphicsManager.Render().
protected override void OnRender(RenderContext context)
{
if (ActiveCameraNode == null)
{
return;
}
// Our scene and the camera must be set in the render context. This info is
// required by many renderers.
context.Scene = Scene;
context.CameraNode = ActiveCameraNode;
// LOD (level of detail) settings are also specified in the context.
context.LodCameraNode = ActiveCameraNode;
context.LodHysteresis = 0.5f;
context.LodBias = EnableLod ? 1.0f : 0.0f;
context.LodBlendingEnabled = false;
// ----- Preprocessing
// For some scene nodes we have to update some off-screen render targets before the
// actual scene is rendered.
//
// We only have to do this for the scene nodes which are visible
// by the camera frustum:
var preprocessingQuery = Scene.Query <PreprocessingSceneQuery>(context.CameraNode, context);
#if !XBOX360
// TODO:
_terrainClipmapRenderer.Render(preprocessingQuery.TerrainNodes, context);
#endif
// Generate cloud maps.
// Only necessary if LayeredCloudMaps are used. If the cloud maps are static
// and the settings do not change, it is not necessary to generate the
// cloud maps in every frame. But in the SkySample we use animated cloud maps.
// The CloudMapRenderer can be called several times per frame, it will only
// do the work once per frame.
// See also SkySample.
_cloudMapRenderer.Render(preprocessingQuery.CloudLayerNodes, context);
// Compute ocean waves.
// Only necessary if WaterNodes with OceanWaves are used.
_waterWavesRenderer.Render(preprocessingQuery.WaterNodes, context);
// Perform render-to-texture operations.
// Only necessary if SceneCaptureNodes are used.
// See also SceneCapture2DSample.
SceneCaptureRenderer.Render(preprocessingQuery.SceneCaptureNodes, context);
// Render reflections.
// Only necessary if PlanarReflectionNodes are used.
// See also PlanarReflectionSample.
_planarReflectionRenderer.Render(preprocessingQuery.PlanarReflectionNodes, context);
// ----- Scene Rendering
// Get all scene nodes which overlap the camera frustum.
CustomSceneQuery sceneQuery = Scene.Query <CustomSceneQuery>(context.CameraNode, context);
// Render the scene nodes of the sceneQuery.
RenderScene(sceneQuery, context, true, true, true, DrawReticle);
// ----- Clean-up
context.Scene = null;
context.CameraNode = null;
context.LodCameraNode = null;
context.LodHysteresis = 0;
}
// Renders the graphics screen. - This method is called in GraphicsManager.Render().
protected override void OnRender(RenderContext context)
{
// Abort if no active camera is set.
if (ActiveCameraNode == null)
{
return;
}
var renderTargetPool = GraphicsService.RenderTargetPool;
var graphicsDevice = GraphicsService.GraphicsDevice;
var screenRenderTarget = context.RenderTarget;
var viewport = context.Viewport;
// All intermediate render targets have the size of the target viewport.
int width = context.Viewport.Width;
int height = context.Viewport.Height;
context.Viewport = new Viewport(0, 0, width, height);
// Our scene and the camera must be set in the render context. This info is
// required by many renderers.
context.Scene = Scene;
context.CameraNode = ActiveCameraNode;
// LOD (level of detail) settings are also specified in the context.
context.LodCameraNode = ActiveCameraNode;
context.LodHysteresis = 0.5f;
context.LodBias = EnableLod ? 1.0f : 0.0f;
context.LodBlendingEnabled = false;
// Get all scene nodes which overlap the camera frustum.
CustomSceneQuery sceneQuery = Scene.Query <CustomSceneQuery>(ActiveCameraNode, context);
// Generate cloud maps.
// (Note: Only necessary if LayeredCloudMaps are used. If the cloud maps are
// static and the settings do not change, it is not necessary to generate the
// cloud maps in every frame. But in this example we use animated cloud maps.)
_cloudMapRenderer.Render(sceneQuery.SkyNodes, context);
// ----- G-Buffer Pass
// The GBufferRenderer creates context.GBuffer0 and context.GBuffer1.
_gBufferRenderer.Render(sceneQuery.RenderableNodes, sceneQuery.DecalNodes, context);
// ----- Shadow Pass
// The ShadowMapRenderer renders the shadow maps which are stored in the light nodes.
context.RenderPass = "******";
_shadowMapRenderer.Render(sceneQuery.Lights, context);
context.RenderPass = null;
// The ShadowMaskRenderer renders the shadows and stores them in one or more render
// targets ("shadows masks").
_shadowMaskRenderer.Render(sceneQuery.Lights, context);
// In this render pipeline we do not need most shadow maps anymore and can
// recycle them. The exception is the DirectionalLight shadow map which
// might still be needed for forward rendering of alpha-blended objects.
foreach (var node in sceneQuery.Lights)
{
var lightNode = (LightNode)node;
if (lightNode.Shadow != null && !(lightNode.Light is DirectionalLight))
{
renderTargetPool.Recycle(lightNode.Shadow.ShadowMap);
lightNode.Shadow.ShadowMap = null;
}
}
// ----- Light Buffer Pass
// The LightBufferRenderer creates context.LightBuffer0 (diffuse light) and
// context.LightBuffer1 (specular light).
LightBufferRenderer.Render(sceneQuery.Lights, context);
// ----- Material Pass
// In the material pass we render all meshes and decals into a single full-screen
// render target. The shaders combine the material properties (diffuse texture, etc.)
// with the light buffer info.
context.RenderTarget = renderTargetPool.Obtain2D(new RenderTargetFormat(width, height, false, SurfaceFormat.HdrBlendable, DepthFormat.Depth24Stencil8));
graphicsDevice.SetRenderTarget(context.RenderTarget);
context.Viewport = graphicsDevice.Viewport;
graphicsDevice.Clear(Color.Black);
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.Opaque;
context.RenderPass = "******";
_meshRenderer.Render(sceneQuery.RenderableNodes, context);
_decalRenderer.Render(sceneQuery.DecalNodes, context);
context.RenderPass = null;
// The meshes rendered in the last step might use additional floating-point
// textures (e.g. the light buffers) in the different graphics texture stages.
// We reset the texture stages (setting all GraphicsDevice.Textures to null),
// otherwise XNA might throw exceptions.
graphicsDevice.ResetTextures();
// ----- Occlusion Queries
_lensFlareRenderer.UpdateOcclusion(sceneQuery.LensFlareNodes, context);
// ----- Sky
_skyRenderer.Render(sceneQuery.SkyNodes, context);
// ----- Fog
_fogRenderer.Render(sceneQuery.FogNodes, context);
// ----- Forward Rendering of Alpha-Blended Meshes and Particles
graphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.AlphaBlend;
context.RenderPass = "******";
AlphaBlendSceneRenderer.Render(sceneQuery.RenderableNodes, context, RenderOrder.BackToFront);
context.RenderPass = null;
graphicsDevice.ResetTextures();
// The shadow maps could be used by some shaders of the alpha-blended
// objects - but now, we can recycle all shadow maps.
foreach (var node in sceneQuery.Lights)
{
var lightNode = (LightNode)node;
if (lightNode.Shadow != null)
{
renderTargetPool.Recycle(lightNode.Shadow.ShadowMap);
lightNode.Shadow.ShadowMap = null;
}
}
// ----- Post Processors
// The post-processors modify the scene image and the result is written into
// the final render target - which is usually the back buffer (but this could
// also be another off-screen render target used in another graphics screen).
context.SourceTexture = context.RenderTarget;
context.RenderTarget = screenRenderTarget;
context.Viewport = viewport;
PostProcessors.Process(context);
renderTargetPool.Recycle((RenderTarget2D)context.SourceTexture);
context.SourceTexture = null;
// ----- Lens Flares
_lensFlareRenderer.Render(sceneQuery.LensFlareNodes, context);
// ----- Optional: Restore the Z-Buffer
// Currently, the hardware depth buffer is not initialized with useful data because
// every time we change the render target, XNA deletes the depth buffer. If we want
// the debug rendering to use correct depth buffer, we can restore the depth buffer
// using the RebuildZBufferRenderer. If we remove this step, then the DebugRenderer
// graphics will overlay the whole 3D scene.
_rebuildZBufferRenderer.Render(context, true);
// ----- Debug Output
// Render debug info added by game objects.
DebugRenderer.Render(context);
// ----- Draw Reticle
if (DrawReticle)
{
_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
_spriteBatch.Draw(
_reticle,
new Vector2(viewport.Width / 2 - _reticle.Width / 2, viewport.Height / 2 - _reticle.Height / 2),
Color.Black);
_spriteBatch.End();
}
// Render intermediate render targets for debugging.
// We do not use the public DebugRenderer here because the public DebugRenderer
// might not be cleared every frame (the game logic can choose how it wants to
// use the public renderer).
if (VisualizeIntermediateRenderTargets)
{
_internalDebugRenderer.DrawTexture(context.GBuffer0, new Rectangle(0, 0, 200, 200));
_internalDebugRenderer.DrawTexture(context.GBuffer1, new Rectangle(200, 0, 200, 200));
_internalDebugRenderer.DrawTexture(context.LightBuffer0, new Rectangle(400, 0, 200, 200));
_internalDebugRenderer.DrawTexture(context.LightBuffer1, new Rectangle(600, 0, 200, 200));
for (int i = 0; i < _shadowMaskRenderer.ShadowMasks.Count; i++)
{
var shadowMask = _shadowMaskRenderer.ShadowMasks[i];
if (shadowMask != null)
{
_internalDebugRenderer.DrawTexture(shadowMask, new Rectangle((i) * 200, 200, 200, 200));
}
}
_internalDebugRenderer.Render(context);
_internalDebugRenderer.Clear();
}
// ----- Clean-up
// It is very important to give every intermediate render target back to the
// render target pool!
renderTargetPool.Recycle(context.GBuffer0);
context.GBuffer0 = null;
renderTargetPool.Recycle(context.GBuffer1);
context.GBuffer1 = null;
renderTargetPool.Recycle((RenderTarget2D)context.Data[RenderContextKeys.DepthBufferHalf]);
context.Data.Remove(RenderContextKeys.DepthBufferHalf);
renderTargetPool.Recycle(context.LightBuffer0);
context.LightBuffer0 = null;
renderTargetPool.Recycle(context.LightBuffer1);
context.LightBuffer1 = null;
_shadowMaskRenderer.RecycleShadowMasks();
context.Scene = null;
context.CameraNode = null;
context.LodHysteresis = 0;
context.LodCameraNode = null;
context.RenderPass = null;
}
private void Render(RenderContext context)
{
var originalRenderTarget = context.RenderTarget;
var originalViewport = context.Viewport;
var graphicsDevice = context.GraphicsService.GraphicsDevice;
if (_updateCubeMap)
{
_updateCubeMap = false;
_cloudMapRenderer.Render(_skyNodes, context);
// Create a camera with 45° FOV for a single cube map face.
var perspectiveProjection = new PerspectiveProjection();
perspectiveProjection.SetFieldOfView(ConstantsF.PiOver2, 1, 1, 100);
context.CameraNode = new CameraNode(new Camera(perspectiveProjection));
var size = _skybox.Texture.Size;
var hdrFormat = new RenderTargetFormat(size, size, false, SurfaceFormat.HdrBlendable, DepthFormat.None);
var hdrTarget = context.GraphicsService.RenderTargetPool.Obtain2D(hdrFormat);
var ldrFormat = new RenderTargetFormat(size, size, false, SurfaceFormat.Color, DepthFormat.None);
var ldrTarget = context.GraphicsService.RenderTargetPool.Obtain2D(ldrFormat);
var spriteBatch = GraphicsService.GetSpriteBatch();
for (int side = 0; side < 6; side++)
{
// Rotate camera to face the current cube map face.
var cubeMapFace = (CubeMapFace)side;
context.CameraNode.View = Matrix44F.CreateLookAt(
new Vector3F(),
GraphicsHelper.GetCubeMapForwardDirection(cubeMapFace),
GraphicsHelper.GetCubeMapUpDirection(cubeMapFace));
// Render sky into HDR render target.
graphicsDevice.SetRenderTarget(hdrTarget);
context.RenderTarget = hdrTarget;
context.Viewport = graphicsDevice.Viewport;
graphicsDevice.Clear(Color.Black);
_skyRenderer.Render(_skyNodes, context);
graphicsDevice.BlendState = BlendState.Opaque;
// Convert HDR to RGBM.
context.SourceTexture = hdrTarget;
context.RenderTarget = ldrTarget;
_colorEncoder.Process(context);
context.SourceTexture = null;
// Copy RGBM texture into cube map face.
graphicsDevice.SetRenderTarget((RenderTargetCube)_skybox.Texture, cubeMapFace);
spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, null, null, null);
spriteBatch.Draw(ldrTarget, new Vector2(0, 0), Color.White);
spriteBatch.End();
}
context.GraphicsService.RenderTargetPool.Recycle(ldrTarget);
context.GraphicsService.RenderTargetPool.Recycle(hdrTarget);
}
graphicsDevice.BlendState = BlendState.Opaque;
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
context.CameraNode = _cameraObject.CameraNode;
var tempFormat = new RenderTargetFormat(originalRenderTarget);
tempFormat.SurfaceFormat = SurfaceFormat.HdrBlendable;
var tempTarget = context.GraphicsService.RenderTargetPool.Obtain2D(tempFormat);
graphicsDevice.SetRenderTarget(tempTarget);
graphicsDevice.Viewport = originalViewport;
context.RenderTarget = tempTarget;
context.Viewport = originalViewport;
_skyRenderer.Render(_skybox, context);
context.SourceTexture = tempTarget;
context.RenderTarget = originalRenderTarget;
_hdrFilter.Process(context);
context.SourceTexture = null;
context.GraphicsService.RenderTargetPool.Recycle(tempTarget);
RenderDebugInfo(context);
context.CameraNode = null;
}
protected override void OnRender(RenderContext context)
{
// This screen expects two cameras.
if (ActiveCameraNodeA == null || ActiveCameraNodeB == null)
{
return;
}
var renderTargetPool = GraphicsService.RenderTargetPool;
var graphicsDevice = GraphicsService.GraphicsDevice;
var originalRenderTarget = context.RenderTarget;
var fullViewport = context.Viewport;
// Get a render target for the first camera. Use half the width because we split
// the screen horizontally.
var format = new RenderTargetFormat(context.RenderTarget)
{
Width = fullViewport.Width / 2
};
var renderTargetA = renderTargetPool.Obtain2D(format);
context.Scene = Scene;
context.LodHysteresis = 0.5f;
context.LodBias = 1.0f;
context.LodBlendingEnabled = true;
for (int i = 0; i < 2; i++)
{
Viewport halfViewport;
RenderTarget2D currentRenderTarget;
if (i == 0)
{
// The first camera renders into renderTargetA.
context.CameraNode = ActiveCameraNodeA;
halfViewport = new Viewport(0, 0, fullViewport.Width / 2, fullViewport.Height);
currentRenderTarget = renderTargetA;
}
else
{
// The second camera renders into the right half of the final render target.
context.CameraNode = ActiveCameraNodeB;
halfViewport = new Viewport(fullViewport.X + fullViewport.Width / 2, fullViewport.Y, fullViewport.Width / 2, fullViewport.Height);
currentRenderTarget = originalRenderTarget;
}
context.LodCameraNode = context.CameraNode;
CustomSceneQuery sceneQuery = Scene.Query <CustomSceneQuery>(context.CameraNode, context);
// Cloud maps need to be updated only once.
if (i == 0)
{
_cloudMapRenderer.Render(sceneQuery.SkyNodes, context);
}
// ----- G-Buffer Pass
_gBufferRenderer.Render(sceneQuery.RenderableNodes, sceneQuery.DecalNodes, context);
// ----- Shadow Pass
context.RenderPass = "******";
_shadowMapRenderer.Render(sceneQuery.Lights, context);
context.RenderPass = null;
context.Viewport = halfViewport;
_shadowMaskRenderer.Render(sceneQuery.Lights, context);
// Recycle shadow maps.
foreach (var node in sceneQuery.Lights)
{
var lightNode = (LightNode)node;
if (lightNode.Shadow != null)
{
renderTargetPool.Recycle(lightNode.Shadow.ShadowMap);
lightNode.Shadow.ShadowMap = null;
}
}
// ----- Light Buffer Pass
_lightBufferRenderer.Render(sceneQuery.Lights, context);
// ----- Material Pass
context.RenderTarget = renderTargetPool.Obtain2D(new RenderTargetFormat(
context.Viewport.Width,
context.Viewport.Height,
false,
SurfaceFormat.HdrBlendable,
DepthFormat.Depth24Stencil8));
graphicsDevice.SetRenderTarget(context.RenderTarget);
context.Viewport = graphicsDevice.Viewport;
graphicsDevice.Clear(Color.Black);
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.Opaque;
context.RenderPass = "******";
_meshRenderer.Render(sceneQuery.RenderableNodes, context);
_decalRenderer.Render(sceneQuery.DecalNodes, context);
context.RenderPass = null;
graphicsDevice.ResetTextures();
// ----- Occlusion Queries
_lensFlareRenderer.UpdateOcclusion(sceneQuery.LensFlareNodes, context);
// ----- Sky
_skyRenderer.Render(sceneQuery.SkyNodes, context);
// ----- Fog
_fogRenderer.Render(sceneQuery.FogNodes, context);
// ----- Forward Rendering of Alpha-Blended Meshes and Particles
graphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.AlphaBlend;
context.RenderPass = "******";
_transparentSceneRenderer.Render(sceneQuery.RenderableNodes, context, RenderOrder.BackToFront);
context.RenderPass = null;
graphicsDevice.ResetTextures();
// ----- Lens Flares
_lensFlareRenderer.Render(sceneQuery.LensFlareNodes, context);
// ----- Post Processors
context.SourceTexture = context.RenderTarget;
context.RenderTarget = currentRenderTarget;
context.Viewport = halfViewport;
PostProcessors.Process(context);
renderTargetPool.Recycle((RenderTarget2D)context.SourceTexture);
context.SourceTexture = null;
// ----- Optional: Restore the Z-Buffer
_rebuildZBufferRenderer.Render(context, true);
// ----- Debug Output
DebugRenderer.Render(context);
// ----- Draw Reticle
if (DrawReticle)
{
_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
_spriteBatch.Draw(
_reticle,
new Vector2(halfViewport.Width / 2 - _reticle.Width / 2, halfViewport.Height / 2 - _reticle.Height / 2),
Color.Black);
_spriteBatch.End();
}
// ----- Clean-up
renderTargetPool.Recycle(context.GBuffer0);
context.GBuffer0 = null;
renderTargetPool.Recycle(context.GBuffer1);
context.GBuffer1 = null;
renderTargetPool.Recycle((RenderTarget2D)context.Data[RenderContextKeys.DepthBufferHalf]);
context.Data.Remove(RenderContextKeys.DepthBufferHalf);
renderTargetPool.Recycle(context.LightBuffer0);
context.LightBuffer0 = null;
renderTargetPool.Recycle(context.LightBuffer1);
context.LightBuffer1 = null;
_shadowMaskRenderer.RecycleShadowMasks();
// ----- Copy image of first camera.
if (i == 1)
{
// Copy the upper screen from the temporary render target back into the back buffer.
context.Viewport = fullViewport;
graphicsDevice.Viewport = fullViewport;
_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullNone);
_spriteBatch.Draw(
renderTargetA,
new Rectangle(0, 0, fullViewport.Width / 2, fullViewport.Height),
Color.White);
_spriteBatch.End();
renderTargetPool.Recycle(renderTargetA);
}
}
context.Scene = null;
context.CameraNode = null;
context.LodCameraNode = null;
context.RenderPass = null;
}
private void UpdateCubeMap(TimeSpan deltaTime)
{
if (_cloudMapRenderer == null)
{
// This is the first call of UpdateCubeMap. Create the renderers which
// we need to render the cube map.
// The CloudMapRenderer creates and animates the LayeredCloudMaps.
_cloudMapRenderer = new CloudMapRenderer(_graphicsService);
// The SkyRenderer renders SkyNodes.
_skyRenderer = new SkyRenderer(_graphicsService);
// We use a ColorEncoder to encode a HDR image in a normal Color texture.
_colorEncoder = new ColorEncoder(_graphicsService)
{
SourceEncoding = ColorEncoding.Rgb,
TargetEncoding = SkyboxNode.Encoding,
};
// The SceneCaptureRenderer handles SceneCaptureNodes. We need to specify
// a delegate which is called in SceneCaptureNode.Render().
_sceneCaptureRenderer = new SceneCaptureRenderer(context =>
{
var graphicsDevice = _graphicsService.GraphicsDevice;
var renderTargetPool = _graphicsService.RenderTargetPool;
// We have to render into this render target.
var ldrTarget = context.RenderTarget;
// Reset render states.
graphicsDevice.BlendState = BlendState.Opaque;
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
// Use an intermediate HDR render target with the same resolution as the final target.
var format = new RenderTargetFormat(ldrTarget)
{
SurfaceFormat = SurfaceFormat.HdrBlendable,
DepthStencilFormat = DepthFormat.Depth24Stencil8
};
var hdrTarget = renderTargetPool.Obtain2D(format);
graphicsDevice.SetRenderTarget(hdrTarget);
context.RenderTarget = hdrTarget;
graphicsDevice.Clear(Color.Black);
// Render the sky.
_skyRenderer.Render(_skyGroupNode.Children, context);
// Convert the HDR image to RGBM image.
context.SourceTexture = hdrTarget;
context.RenderTarget = ldrTarget;
_colorEncoder.Process(context);
context.SourceTexture = null;
// Clean up.
renderTargetPool.Recycle(hdrTarget);
context.RenderTarget = ldrTarget;
});
// Normally, the render context is managed by the graphics service.
// When we call renderer outside of a GraphicsScreen, we have to use our
// own context instance.
_context = new RenderContext(_graphicsService);
}
// Update render context.
// Frame needs to be updated to tell the renderers that this is a new "frame".
// (Otherwise, they might abort early to avoid duplicate work in the same frame.)
_context.Frame++;
// DeltaTime is relevant for renderers such as the CloudMapRenderer because it
// might have to animate the clouds.
_context.DeltaTime = deltaTime;
// Create cloud maps.
_cloudMapRenderer.Render(_skyGroupNode.Children, _context);
// Capture sky in cube map.
_sceneCaptureRenderer.Render(_sceneCaptureNode, _context);
}
protected override void OnRender(RenderContext context)
{
if (ActiveCameraNode == null)
{
return;
}
var renderTargetPool = GraphicsService.RenderTargetPool;
var graphicsDevice = GraphicsService.GraphicsDevice;
var originalRenderTarget = context.RenderTarget;
var fullViewport = context.Viewport;
// Get a render target for the first camera. Use half the width and height.
int halfWidth = fullViewport.Width / 2;
int halfHeight = fullViewport.Height / 2;
var format = new RenderTargetFormat(context.RenderTarget)
{
Width = halfWidth,
Height = halfHeight
};
var renderTarget0 = renderTargetPool.Obtain2D(format);
var renderTarget1 = renderTargetPool.Obtain2D(format);
var renderTarget2 = renderTargetPool.Obtain2D(format);
var viewport0 = new Viewport(0, 0, halfWidth, halfHeight);
var viewport1 = new Viewport(halfWidth, 0, halfWidth, halfHeight);
var viewport2 = new Viewport(0, halfHeight, halfWidth, halfHeight);
context.Scene = Scene;
context.CameraNode = ActiveCameraNode;
context.LodCameraNode = context.CameraNode;
context.LodHysteresis = 0.5f;
// Reduce detail level by increasing the LOD bias.
context.LodBias = 2.0f;
for (int i = 0; i < 4; i++)
{
Viewport halfViewport;
RenderTarget2D currentRenderTarget;
if (i == 0)
{
// TOP, LEFT
currentRenderTarget = renderTarget0;
halfViewport = new Viewport(0, 0, viewport0.Width, viewport0.Height);
context.LodBlendingEnabled = false;
}
else if (i == 1)
{
// TOP, RIGHT
currentRenderTarget = renderTarget1;
halfViewport = new Viewport(0, 0, viewport1.Width, viewport1.Height);
context.LodBlendingEnabled = true;
}
else if (i == 2)
{
// BOTTOM, LEFT
currentRenderTarget = renderTarget2;
halfViewport = new Viewport(0, 0, viewport2.Width, viewport2.Height);
context.LodBlendingEnabled = false;
}
else
{
// BOTTOM, RIGHT
currentRenderTarget = originalRenderTarget;
halfViewport = new Viewport(fullViewport.X + halfWidth, fullViewport.Y + halfHeight, halfWidth, halfHeight);
context.LodBlendingEnabled = true;
}
var sceneQuery = Scene.Query <SceneQueryWithLodBlending>(context.CameraNode, context);
if (i == 0 || i == 1)
{
// TOP
for (int j = 0; j < sceneQuery.RenderableNodes.Count; j++)
{
if (sceneQuery.RenderableNodes[j].UserFlags == 1)
{
sceneQuery.RenderableNodes[j] = null;
}
}
}
else
{
// BOTTOM
for (int j = 0; j < sceneQuery.RenderableNodes.Count; j++)
{
if (sceneQuery.RenderableNodes[j].UserFlags == 2)
{
sceneQuery.RenderableNodes[j] = null;
}
}
}
// Cloud maps need to be updated only once.
if (i == 0)
{
_cloudMapRenderer.Render(sceneQuery.SkyNodes, context);
}
// ----- G-Buffer Pass
_gBufferRenderer.Render(sceneQuery.RenderableNodes, sceneQuery.DecalNodes, context);
// ----- Shadow Pass
context.RenderPass = "******";
_shadowMapRenderer.Render(sceneQuery.Lights, context);
context.RenderPass = null;
context.Viewport = halfViewport;
_shadowMaskRenderer.Render(sceneQuery.Lights, context);
// Recycle shadow maps.
foreach (var node in sceneQuery.Lights)
{
var lightNode = (LightNode)node;
if (lightNode.Shadow != null)
{
renderTargetPool.Recycle(lightNode.Shadow.ShadowMap);
lightNode.Shadow.ShadowMap = null;
}
}
// ----- Light Buffer Pass
_lightBufferRenderer.Render(sceneQuery.Lights, context);
// ----- Material Pass
context.RenderTarget = renderTargetPool.Obtain2D(new RenderTargetFormat(
context.Viewport.Width,
context.Viewport.Height,
false,
SurfaceFormat.HdrBlendable,
DepthFormat.Depth24Stencil8));
graphicsDevice.SetRenderTarget(context.RenderTarget);
context.Viewport = graphicsDevice.Viewport;
graphicsDevice.Clear(Color.Black);
graphicsDevice.DepthStencilState = DepthStencilState.Default;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.Opaque;
context.RenderPass = "******";
_meshRenderer.Render(sceneQuery.RenderableNodes, context);
_decalRenderer.Render(sceneQuery.DecalNodes, context);
context.RenderPass = null;
graphicsDevice.ResetTextures();
// ----- Occlusion Queries
_lensFlareRenderer.UpdateOcclusion(sceneQuery.LensFlareNodes, context);
// ----- Sky
_skyRenderer.Render(sceneQuery.SkyNodes, context);
// ----- Fog
_fogRenderer.Render(sceneQuery.FogNodes, context);
// ----- Forward Rendering of Alpha-Blended Meshes and Particles
graphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
graphicsDevice.BlendState = BlendState.AlphaBlend;
context.RenderPass = "******";
_transparentSceneRenderer.Render(sceneQuery.RenderableNodes, context, RenderOrder.BackToFront);
context.RenderPass = null;
graphicsDevice.ResetTextures();
// ----- Lens Flares
_lensFlareRenderer.Render(sceneQuery.LensFlareNodes, context);
// ----- Post Processors
context.SourceTexture = context.RenderTarget;
context.RenderTarget = currentRenderTarget;
context.Viewport = halfViewport;
PostProcessors.Process(context);
renderTargetPool.Recycle((RenderTarget2D)context.SourceTexture);
context.SourceTexture = null;
// ----- Optional: Restore the Z-Buffer
_rebuildZBufferRenderer.Render(context, true);
// ----- Debug Output
DebugRenderer.Render(context);
// ----- Draw Reticle
if (DrawReticle)
{
_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
_spriteBatch.Draw(
_reticle,
new Vector2(halfViewport.Width / 2 - _reticle.Width / 2, halfViewport.Height / 2 - _reticle.Height / 2),
Color.Black);
_spriteBatch.End();
}
// ----- Clean-up
renderTargetPool.Recycle(context.GBuffer0);
context.GBuffer0 = null;
renderTargetPool.Recycle(context.GBuffer1);
context.GBuffer1 = null;
renderTargetPool.Recycle((RenderTarget2D)context.Data[RenderContextKeys.DepthBufferHalf]);
context.Data.Remove(RenderContextKeys.DepthBufferHalf);
renderTargetPool.Recycle(context.LightBuffer0);
context.LightBuffer0 = null;
renderTargetPool.Recycle(context.LightBuffer1);
context.LightBuffer1 = null;
_shadowMaskRenderer.RecycleShadowMasks();
sceneQuery.Reset();
}
// ----- Copy screens.
// Copy the previous screens from the temporary render targets into the back buffer.
context.Viewport = fullViewport;
graphicsDevice.Viewport = fullViewport;
_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullNone);
_spriteBatch.Draw(renderTarget0, viewport0.Bounds, Color.White);
_spriteBatch.Draw(renderTarget1, viewport1.Bounds, Color.White);
_spriteBatch.Draw(renderTarget2, viewport2.Bounds, Color.White);
_spriteBatch.End();
renderTargetPool.Recycle(renderTarget0);
renderTargetPool.Recycle(renderTarget1);
renderTargetPool.Recycle(renderTarget2);
context.Scene = null;
context.CameraNode = null;
context.LodCameraNode = null;
context.RenderPass = null;
}
