public void Draw(GraphicsDevice device, BoundingBox boundingBox, Camera camera, Color color)
{
if (declaration == null)
{
declaration = VertexPositionColor.VertexDeclaration;
}
if (effect == null)
{
effect = new BasicEffect(device);
}
effect.DiffuseColor = color.ToVector3();
effect.View = camera.EyeTransform;
effect.Projection = camera.ProjectionTransform;
Vector3 size = boundingBox.Max - boundingBox.Min;
effect.World = Matrix.CreateScale(size)*Matrix.CreateTranslation(boundingBox.Max - size*0.5f);
foreach (EffectPass pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
device.DrawUserIndexedPrimitives<VertexPositionColor>(
PrimitiveType.LineList, points,
0,
8,
index,
0,
12);
}
}
public void RenderToGBuffer(Camera camera, GraphicsDevice graphicsDevice)
{
if (_subMeshes.Count == 0)
return;
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
Mesh.SubMesh subMesh = _subMeshes[0];
ModelMeshPart meshPart = subMesh._meshPart;
graphicsDevice.SetVertexBuffers(
new VertexBufferBinding(meshPart.VertexBuffer, meshPart.VertexOffset, 0),
new VertexBufferBinding(_instanceVertexBuffer, 0, 1)
);
subMesh.RenderEffect.SetCurrentTechnique(3);
subMesh.RenderEffect.SetMatrices(Matrix.Identity, camera.EyeTransform, camera.ProjectionTransform);
//our first pass is responsible for rendering into GBuffer
subMesh.RenderEffect.SetFarClip(camera.FarClip);
//no individual skinned models for now
if (subMesh._parent.BoneMatrixes != null)
subMesh.RenderEffect.SetBones(subMesh._parent.BoneMatrixes);
subMesh.RenderEffect.Apply();
graphicsDevice.Indices = meshPart.IndexBuffer;
graphicsDevice.DrawInstancedPrimitives(PrimitiveType.TriangleList, 0, 0,
meshPart.NumVertices, meshPart.StartIndex,
meshPart.PrimitiveCount, _subMeshes.Count);
}
public CameraController(Viewport v, Matrix initialTransform)
{
camera = new Camera();
camera.Aspect = v.AspectRatio;
camera.NearClip = 0.1f;
camera.FarClip = 1000;
camera.Viewport = v;
camera.Transform = initialTransform;
targetXYZ = camera.Transform.Translation;
lastXYZ = targetXYZ;
}
public virtual void RenderToGBuffer(Camera camera, GraphicsDevice graphicsDevice)
{
RenderEffect.SetCurrentTechnique(0);
RenderEffect.SetMatrices(GlobalTransform, camera.EyeTransform, camera.ProjectionTransform);
//our first pass is responsible for rendering into GBuffer
RenderEffect.SetFarClip(camera.FarClip);
if (_parent.BoneMatrixes != null)
RenderEffect.SetBones(_parent.BoneMatrixes);
RenderEffect.Apply();
graphicsDevice.SetVertexBuffer(_meshPart.VertexBuffer, _meshPart.VertexOffset);
graphicsDevice.Indices = _meshPart.IndexBuffer;
graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, _meshPart.NumVertices, _meshPart.StartIndex, _meshPart.PrimitiveCount);
}
//construct
public MenuBackground()
{
viewport = Globals.graphics.GraphicsDevice.Viewport;
// Create the renderer, this renderer binds to the graphics device and with the given width and height, is used to
// draw everything on each frame
renderer = new Renderer(Globals.graphics.GraphicsDevice, Globals.content, viewport.Width, viewport.Height);
// The light and mesh container is used to store mesh and light obejcts. This is just for RENDERING. Not for DRAWING
lightAndMeshContainer = new SimpleSceneGraph();
lightAndMeshContainer.SetSubMeshDelegate(delegate(Mesh.SubMesh subMesh)
{
renderer.SetupSubMesh(subMesh);
subMesh.RenderEffect.AmbientParameter.SetValue(Vector4.Zero);
});
lightAndMeshContainer.SetLightDelegate(delegate(Light l) { });
camera = new Camera();
camera.Aspect = viewport.AspectRatio;
camera.NearClip = 0.1f;
camera.FarClip = 1000;
camera.Viewport = viewport;
camera.Transform = Matrix.CreateFromYawPitchRoll(MathHelper.ToRadians(170),-0.3f,0) * Matrix.CreateTranslation(2,5f,-4);
Mesh m = new Mesh();
m.Model = AssetLoader.mdl_menuscene;
m.Transform = Matrix.Identity;
lightAndMeshContainer.AddMesh(m);
Light mainlight = new Light();
mainlight.LightType = Light.Type.Spot;
mainlight.Color = Color.AntiqueWhite;
mainlight.Transform = Matrix.CreateFromYawPitchRoll(MathHelper.ToRadians(170),-0.7f,0) * Matrix.CreateTranslation(0, 5f, -4);
mainlight.SpotAngle = 50;
mainlight.SpotExponent = 1;
mainlight.Radius = 13;
mainlight.Intensity = 2f;
lightAndMeshContainer.AddLight(mainlight);
}
private void BuildLightEntries(Camera camera)
{
_lightEntries.Clear();
for (int index = 0; index < _visibleLights.Count; index++)
{
LightEntry lightEntry = new LightEntry();
lightEntry.light = _visibleLights[index];
_lightEntries.Add(lightEntry);
}
}
/// <summary>
/// Do a frustum culling test on each sub mesh, adding the visible ones to our list
/// </summary>
/// <param name="camera"></param>
/// <param name="meshes"></param>
private void CullVisibleMeshes(Camera camera, BaseSceneGraph sceneGraph)
{
for (int index = 0; index < _visibleMeshes.Length; index++)
{
_visibleMeshes[index].Clear();
}
sceneGraph.GetVisibleMeshes(camera.Frustum, _visibleMeshes);
}
private void DrawBlendObjects(Camera camera)
{
_graphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
_graphicsDevice.BlendState = BlendState.Additive;
List<Mesh.SubMesh> meshes = _visibleMeshes[(int)MeshMetadata.ERenderQueue.Blend];
for (int index = 0; index < meshes.Count; index++)
{
Mesh.SubMesh visibleMesh = meshes[index];
visibleMesh.GenericRender(camera, GraphicsDevice);
}
//reset states, since the custom shaders could have overriden them
_graphicsDevice.DepthStencilState = DepthStencilState.DepthRead;
_graphicsDevice.BlendState = BlendState.Additive;
_graphicsDevice.BlendFactor = Color.White;
_graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
Matrix projectionTransform = camera.ProjectionTransform;
Matrix eyeTransform = camera.EyeTransform;
}
private void DrawOpaqueObjects(Camera camera)
{
List<Mesh.SubMesh> meshes = _visibleMeshes[(int)MeshMetadata.ERenderQueue.SkipGbuffer];
for (int index = 0; index < meshes.Count; index++)
{
Mesh.SubMesh visibleMesh = meshes[index];
visibleMesh.GenericRender(camera, GraphicsDevice);
}
}
public void ReconstructShading(Camera camera, GraphicsDevice graphicsDevice)
{
for (int index = 0; index < _instancingGroups.Count; index++)
{
InstancingGroup instancingGroup = _instancingGroups[index];
instancingGroup.ReconstructShading(camera, graphicsDevice);
}
}
private void RenderToGbuffer(Camera camera)
{
List<Mesh.SubMesh> meshes = _visibleMeshes[(int)MeshMetadata.ERenderQueue.Default];
for (int index = 0; index < meshes.Count; index++)
{
Mesh.SubMesh mesh = meshes[index];
if (!mesh.InstanceEnabled)
{
mesh.RenderToGBuffer(camera, GraphicsDevice);
}
else
{
InstancingGroupManager.AddInstancedSubMesh(mesh);
}
}
InstancingGroupManager.GenerateInstanceInfo(GraphicsDevice);
InstancingGroupManager.RenderToGBuffer(camera, GraphicsDevice);
}
private void ReconstructShading(Camera camera)
{
List<Mesh.SubMesh> meshes = _visibleMeshes[(int)MeshMetadata.ERenderQueue.Default];
for (int index = 0; index < meshes.Count; index++)
{
Mesh.SubMesh visibleMesh = meshes[index];
if (!visibleMesh.InstanceEnabled)
{
visibleMesh.ReconstructShading(camera, GraphicsDevice);
}
}
//reuse the instance groups
InstancingGroupManager.ReconstructShading(camera, GraphicsDevice);
}
/// <summary>
/// It assumes that this shader is not the default LPP shader, and it will use ONLY the first technique
/// </summary>
/// <param name="camera"></param>
/// <param name="graphicsDevice"></param>
/// <param name="renderStatistics"></param>
public void GenericRender(Camera camera, GraphicsDevice graphicsDevice)
{
RenderEffect.SetMatrices(GlobalTransform, camera.EyeTransform, camera.ProjectionTransform);
if (_parent.BoneMatrixes != null)
RenderEffect.SetBones(_parent.BoneMatrixes);
RenderEffect.Apply();
graphicsDevice.SetVertexBuffer(_meshPart.VertexBuffer, _meshPart.VertexOffset);
graphicsDevice.Indices = _meshPart.IndexBuffer;
graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, _meshPart.NumVertices, _meshPart.StartIndex, _meshPart.PrimitiveCount);
}
public void ReconstructShading(Camera camera, GraphicsDevice graphicsDevice)
{
if (_subMeshes.Count == 0)
return;
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
Mesh.SubMesh subMesh = _subMeshes[0];
ModelMeshPart meshPart = subMesh._meshPart;
graphicsDevice.SetVertexBuffers(
new VertexBufferBinding(meshPart.VertexBuffer, meshPart.VertexOffset, 0),
new VertexBufferBinding(_instanceVertexBuffer, 0, 1)
);
subMesh.RenderEffect.SetCurrentTechnique(4);
subMesh.RenderEffect.Apply();
graphicsDevice.Indices = meshPart.IndexBuffer;
graphicsDevice.DrawInstancedPrimitives(PrimitiveType.TriangleList, 0, 0,
meshPart.NumVertices, meshPart.StartIndex,
meshPart.PrimitiveCount, _subMeshes.Count);
}
/// <summary>
/// Generate the shadow maps and matrixes for the visible lights. We should limit
/// our shadow-casters based on number of available shadow maps (we could use some
/// performance-related heuristic here too)
/// </summary>
/// <param name="camera"></param>
/// <param name="meshes"></param>
/// <param name="renderWorld"></param>
private void GenerateShadows(Camera camera, BaseSceneGraph sceneGraph)
{
for (int index = 0; index < _lightShadowCasters.Count; index++)
{
LightEntry light = _lightShadowCasters[index];
//only spot
if (light.light.LightType == Light.Type.Spot)
{
_shadowRenderer.GenerateShadowTextureSpotLight(this, sceneGraph, light.light, light.spotShadowMap);
}
}
}
private void ReconstructZBuffer(Camera camera)
{
//bind effect
_reconstructZBuffer.Parameters["GBufferPixelSize"].SetValue(new Vector2(0.5f / _width, 0.5f / _height));
_reconstructZBuffer.Parameters["DepthBuffer"].SetValue(_depthBuffer);
_reconstructZBuffer.Parameters["FarClip"].SetValue(camera.FarClip);
//our projection matrix is almost all 0s, we just need these 2 values to restoure our Z-buffer from our linear depth buffer
_reconstructZBuffer.Parameters["ProjectionValues"].SetValue(new Vector2(camera.ProjectionTransform.M33, camera.ProjectionTransform.M43));
_reconstructZBuffer.CurrentTechnique.Passes[0].Apply();
//we need to always write to z-buffer
//store previous state
BlendState oldBlendState = GraphicsDevice.BlendState;
GraphicsDevice.DepthStencilState = _depthStateReconstructZ;
_quadRenderer.RenderQuad(GraphicsDevice, -Vector2.One, Vector2.One);
GraphicsDevice.DepthStencilState = _depthStateDrawLights;
GraphicsDevice.BlendState = oldBlendState;
}
public void ReconstructShading(Camera camera, GraphicsDevice graphicsDevice)
{
//this pass uses the light diffuse and specular accumulation texture (already bound in the setup stage) and reconstruct the mesh's shading
//our parameters were already filled in the first pass
RenderEffect.SetCurrentTechnique(1);
//we don't need to do this again, it was done on the previous step
//_renderEffect.SetMatrices(GlobalTransform, camera.EyeTransform, camera.ProjectionTransform);
// if (_parent.BoneMatrixes != null)
// _renderEffect.SetBones(_parent.BoneMatrixes);
RenderEffect.Apply();
graphicsDevice.SetVertexBuffer(_meshPart.VertexBuffer, _meshPart.VertexOffset);
graphicsDevice.Indices = _meshPart.IndexBuffer;
graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, _meshPart.NumVertices, _meshPart.StartIndex, _meshPart.PrimitiveCount);
}
private void RenderLights(Camera camera)
{
_lighting.Parameters["GBufferPixelSize"].SetValue(new Vector2(0.5f / _width, 0.5f / _height));
_lighting.Parameters["DepthBuffer"].SetValue(_depthBuffer);
_lighting.Parameters["NormalBuffer"].SetValue(_normalBuffer);
//just comment this line if you dont want to reconstruct the zbuffer
ReconstructZBuffer(camera);
_lighting.Parameters["TanAspect"].SetValue(new Vector2(camera.TanFovy * camera.Aspect, -camera.TanFovy));
for (int i = 0; i < _lightEntries.Count; i++)
{
LightEntry lightEntry = _lightEntries[i];
Light light = lightEntry.light;
//convert light position into viewspace
Vector3 viewSpaceLPos = Vector3.Transform(light.Transform.Translation, camera.EyeTransform);
Vector3 viewSpaceLDir = Vector3.TransformNormal(Vector3.Normalize(light.Transform.Backward), camera.EyeTransform);
_lighting.Parameters["LightPosition"].SetValue(viewSpaceLPos);
_lighting.Parameters["LightDir"].SetValue(viewSpaceLDir);
Vector4 lightColor = light.Color.ToVector4() * light.Intensity;
lightColor.W = light.SpecularIntensity;
_lighting.Parameters["LightColor"].SetValue(lightColor);
float invRadiusSqr = 1.0f / (light.Radius * light.Radius);
_lighting.Parameters["InvLightRadiusSqr"].SetValue(invRadiusSqr);
_lighting.Parameters["FarClip"].SetValue(camera.FarClip);
switch (light.LightType)
{
case Light.Type.Point:
case Light.Type.Spot:
if (light.LightType == Light.Type.Point)
{
//check if the light touches the near plane
BoundingSphere boundingSphereExpanded = light.BoundingSphere;
boundingSphereExpanded.Radius *= 1.375f; //expand it a little, because our mesh is not a perfect sphere
PlaneIntersectionType planeIntersectionType;
camera.Frustum.Near.Intersects(ref boundingSphereExpanded, out planeIntersectionType);
if (planeIntersectionType != PlaneIntersectionType.Back)
{
GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
GraphicsDevice.DepthStencilState = _ccwDepthState;
}
else
{
GraphicsDevice.RasterizerState = RasterizerState.CullClockwise;
GraphicsDevice.DepthStencilState = _cwDepthState;
}
Matrix lightMatrix = Matrix.CreateScale(light.Radius);
lightMatrix.Translation = light.BoundingSphere.Center;
_lighting.Parameters["WorldViewProjection"].SetValue(lightMatrix *
camera.EyeProjectionTransform);
_lighting.CurrentTechnique = _lighting.Techniques[1];
_lighting.CurrentTechnique.Passes[0].Apply();
_sphereRenderer.BindMesh(GraphicsDevice);
_sphereRenderer.RenderMesh(GraphicsDevice);
}
else
{
//check if the light touches the far plane
Plane near = camera.Frustum.Near;
near.D += 3; //give some room because we dont use a perfect-fit mesh for the spot light
PlaneIntersectionType planeIntersectionType = near.Intersects(light.Frustum);
if (planeIntersectionType != PlaneIntersectionType.Back)
{
GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
GraphicsDevice.DepthStencilState = _ccwDepthState;
}
else
{
GraphicsDevice.RasterizerState = RasterizerState.CullClockwise;
GraphicsDevice.DepthStencilState = _cwDepthState;
}
float tan = (float)Math.Tan(MathHelper.ToRadians(light.SpotAngle));
Matrix lightMatrix = Matrix.CreateScale(light.Radius * tan, light.Radius * tan, light.Radius);
lightMatrix = lightMatrix * light.Transform;
_lighting.Parameters["WorldViewProjection"].SetValue(lightMatrix *
camera.EyeProjectionTransform);
float cosSpotAngle = (float)Math.Cos(MathHelper.ToRadians(light.SpotAngle));
_lighting.Parameters["SpotAngle"].SetValue(cosSpotAngle);
_lighting.Parameters["SpotExponent"].SetValue(light.SpotExponent / (1 - cosSpotAngle));
if (lightEntry.castShadows)
{
_lighting.CurrentTechnique = _lighting.Techniques[4];
_lighting.Parameters["MatLightViewProjSpot"].SetValue(lightEntry.spotShadowMap.LightViewProjection);
_lighting.Parameters["DepthBias"].SetValue(light.ShadowDepthBias);
Vector2 shadowMapPixelSize = new Vector2(0.5f / lightEntry.spotShadowMap.Texture.Width, 0.5f / lightEntry.spotShadowMap.Texture.Height);
_lighting.Parameters["ShadowMapPixelSize"].SetValue(shadowMapPixelSize);
_lighting.Parameters["ShadowMapSize"].SetValue(new Vector2(lightEntry.spotShadowMap.Texture.Width, lightEntry.spotShadowMap.Texture.Height));
_lighting.Parameters["ShadowMap"].SetValue(lightEntry.spotShadowMap.Texture);
_lighting.Parameters["CameraTransform"].SetValue(camera.Transform);
}
else
{
_lighting.CurrentTechnique = _lighting.Techniques[3];
}
_lighting.CurrentTechnique.Passes[0].Apply();
_spotRenderer.BindMesh(GraphicsDevice);
_spotRenderer.RenderMesh(GraphicsDevice);
}
break;
default:
throw new ArgumentOutOfRangeException();
}
}
_graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
}
/// <summary>
/// Render the current scene. The culling will be performed inside this method,
/// because we need all meshes here to compute the shadow maps.
/// </summary>
/// <param name="camera">Current camera</param>
/// <param name="visibleLights"></param>
/// <param name="meshes">All meshes</param>
/// <param name="sceneGraph"></param>
/// <param name="particleSystems"></param>
/// <param name="gameTime"></param>
/// <param name="lights">Visible lights</param>
/// <returns></returns>
public RenderTarget2D RenderScene(Camera camera, BaseSceneGraph sceneGraph)
{
InstancingGroupManager.Reset();
sceneGraph.DoPreFrameWork(camera.Frustum);
_depthDownsampledThisFrame = false;
_currentCamera = camera;
//compute the frustum corners for this camera
ComputeFrustumCorners(camera);
//this resets the free shadow maps
_shadowRenderer.InitFrame();
_visibleLights.Clear();
sceneGraph.GetVisibleLights(camera.Frustum, _visibleLights);
//sort lights, choose the shadow casters
BuildLightEntries(camera);
SelectShadowCasters();
//generate all shadow maps
GenerateShadows(camera, sceneGraph);
//first of all, we must bind our GBuffer and reset all states
GraphicsDevice.SetRenderTargets(_gBufferBinding);
GraphicsDevice.Clear(ClearOptions.DepthBuffer | ClearOptions.Stencil, Color.Black, 1.0f, 0);
GraphicsDevice.BlendState = BlendState.Opaque;
GraphicsDevice.DepthStencilState = DepthStencilState.None;
GraphicsDevice.RasterizerState = RasterizerState.CullNone;
//bind the effect that outputs the default GBuffer values
_clearGBuffer.CurrentTechnique.Passes[0].Apply();
//draw a full screen quad for clearing our GBuffer
_quadRenderer.RenderQuad(GraphicsDevice, -Vector2.One, Vector2.One);
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
//select the visible meshes
CullVisibleMeshes(camera, sceneGraph);
//now, render them to the G-Buffer
RenderToGbuffer(camera);
//resolve our GBuffer and render the lights
//clear the light buffer with black
GraphicsDevice.SetRenderTargets(_lightAccumBinding);
//dont be fooled by Color.Black, as its alpha is 255 (or 1.0f)
GraphicsDevice.Clear(new Color(0, 0, 0, 0));
//dont use depth/stencil test...we dont have a depth buffer, anyway
GraphicsDevice.DepthStencilState = DepthStencilState.None;
GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
//draw using additive blending.
//At first I was using BlendState.additive, but it seems to use alpha channel for modulation,
//and as we use alpha channel as the specular intensity, we have to create our own blend state here
GraphicsDevice.BlendState = _lightAddBlendState;
RenderLights(camera);
//reconstruct each object shading, using the light texture as input (and another specific parameters too)
GraphicsDevice.SetRenderTarget(_outputTexture);
GraphicsDevice.Clear(ClearOptions.DepthBuffer | ClearOptions.Stencil | ClearOptions.Target, Color.Black, 1.0f, 0);
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
GraphicsDevice.BlendState = BlendState.Opaque;
GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
//reconstruct the shading, using the already culled list
ReconstructShading(camera);
//render objects that doesn't need the lightbuffer information, such as skyboxes, pure reflective meshes, etc
DrawOpaqueObjects(camera);
//draw objects with transparency
DrawBlendObjects(camera);
//draw SSAO texture. It's not correct to do it here, because ideally the SSAO should affect only
//the ambient light, but it looks good this way
//unbind our final buffer and return it
GraphicsDevice.SetRenderTarget(null);
return _outputTexture;
}
/// <summary>
/// Compute the frustum corners for a camera.
/// Its used to reconstruct the pixel position using only the depth value.
/// Read here for more information
/// http://mynameismjp.wordpress.com/2009/03/10/reconstructing-position-from-depth/
/// </summary>
/// <param name="camera"> Current rendering camera </param>
private void ComputeFrustumCorners(Camera camera)
{
camera.Frustum.GetCorners(_cornersWorldSpace);
Matrix matView = camera.EyeTransform; //this is the inverse of our camera transform
Vector3.Transform(_cornersWorldSpace, ref matView, _cornersViewSpace); //put the frustum into view space
for (int i = 0; i < 4; i++) //take only the 4 farthest points
{
_currentFrustumCorners[i] = _cornersViewSpace[i + 4];
}
Vector3 temp = _currentFrustumCorners[3];
_currentFrustumCorners[3] = _currentFrustumCorners[2];
_currentFrustumCorners[2] = temp;
}
public void RenderToGBuffer(Camera camera, GraphicsDevice graphicsDevice)
{
for (int index = 0; index < _instancingGroups.Count; index++)
{
InstancingGroup instancingGroup = _instancingGroups[index];
instancingGroup.RenderToGBuffer(camera, graphicsDevice);
}
}