public override void Draw(SpriteBatch spriteBatch, RenderTarget2D renderTarget)
{
if (Mode == FogMode.None)
{
return;
}
m_GraphicsDevice.SetRenderTarget(m_SceneRenderTarget);
m_GraphicsDevice.SamplerStates[1] = SamplerState.LinearClamp;
var camera = Camera.Main;
var cameraTransform = camera._transform;
var frustumCorners = camera.CalculateFrustumCorners(new Rectangle(0, 0, 1, 1), camera.Far, 0);
var bottomLeft = cameraTransform.TransformVector(frustumCorners[4]);
var topLeft = cameraTransform.TransformVector(frustumCorners[5]);
var topRight = cameraTransform.TransformVector(frustumCorners[6]);
var bottomRight = cameraTransform.TransformVector(frustumCorners[7]);
var frustumCornersArray = MatrixExtensions.CreateFromVector3(bottomLeft, bottomRight, topLeft, topRight);
var camPos = cameraTransform.Position;
var FdotC = camPos.Y - Height;
var paramK = (FdotC <= 0.0f ? 1.0f : 0.0f);
var excludeDepth = (ExcludeFarPixels ? 1.0f : 2.0f);
var sceneMode = Mode;
var sceneDensity = Density;
var heightParams = new Vector4(Height, FdotC, paramK, HeightDensity * 0.5f);
var distanceParams = new Vector4(-Math.Max(Start, 0.0f), excludeDepth, 0, 0);
var linear = sceneMode == FogMode.Linear;
var diff = linear ? End - Start : 0.0f;
var invDiff = Math.Abs(diff) > 0.0001f ? 1.0f / diff : 0.0f;
var sceneParams = new Vector4(sceneDensity * 1.2011224087f, sceneDensity * 1.4426950408f, linear ? -invDiff : 0.0f, linear ? End * invDiff : 0.0f);
var fogMode = new Vector4((int)sceneMode, UseRadialDistance ? 1 : 0, 0, 0);
var textureSamplerTexelSize = new Vector4(1.0f / (float)renderTarget.Width, 1.0f / (float)renderTarget.Height, renderTarget.Width, renderTarget.Height);
var projectionParams = new Vector4(1.0f, Camera.Main.Near, Camera.Main.Far, 1.0f / Camera.Main.Far);
m_Effect.Parameters["FrustumCornersWS"].SetValue(frustumCornersArray);
m_Effect.Parameters["CameraWS"].SetValue(camPos);
m_Effect.Parameters["HeightParams"].SetValue(heightParams);
m_Effect.Parameters["DistanceParams"].SetValue(distanceParams);
m_Effect.Parameters["FogParams"].SetValue(sceneParams);
m_Effect.Parameters["FogMode"].SetValue(fogMode);
m_Effect.Parameters["FogColor"].SetValue(Scene.current.RenderSettings.FogColor.ToVector4());
m_Effect.Parameters["TextureSamplerTexelSize"].SetValue(textureSamplerTexelSize);
m_Effect.Parameters["ProjectionParams"].SetValue(projectionParams);
m_Effect.Parameters["TargetTexture"].SetValue(renderTarget);
m_Effect.Parameters["DepthTexture"].SetValue(m_DepthBuffer);
var passIndex = 0;
if (DistanceFog && HeightFog)
{
passIndex = 0;
}
else if (DistanceFog)
{
passIndex = 1;
}
else
{
passIndex = 2;
}
m_Effect.CurrentTechnique.Passes[passIndex].Apply();
m_QuadRenderer.RenderFullscreenQuad();
m_GraphicsDevice.SetRenderTarget(null);
m_GraphicsDevice.Textures[1] = m_SceneRenderTarget;
var viewport = m_GraphicsDevice.Viewport;
m_GraphicsDevice.SetRenderTarget(renderTarget);
DrawFullscreenQuad(spriteBatch, m_SceneRenderTarget, m_SceneRenderTarget.Width, m_SceneRenderTarget.Height, null);
}