// 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;
}
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;
}