da7ea779b7
- Rendering the shadows instead of light volumes to avoid the expensive raycasts needed to calculate the light volume. - The LOS shadows are now rendered in two passes (fully obscured + penumbra) instead of each convex hull taking up 2 passes. TODO: fix linux
440 lines
17 KiB
C#
440 lines
17 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using Microsoft.Xna.Framework.Content;
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using System.Collections.Generic;
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using System.Linq;
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namespace Barotrauma.Lights
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{
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class LightManager
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{
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private const float AmbientLightUpdateInterval = 0.2f;
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private const float AmbientLightFalloff = 0.8f;
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private static Entity viewTarget;
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public static Entity ViewTarget
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{
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get { return viewTarget; }
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set {
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if (viewTarget == value) return;
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viewTarget = value;
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}
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}
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public Color AmbientLight;
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private float lightmapScale = 0.5f;
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public RenderTarget2D lightMap
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{
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get;
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private set;
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}
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public RenderTarget2D losTexture
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{
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get;
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private set;
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}
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BasicEffect lightEffect;
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public Effect LosEffect
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{
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get; private set;
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}
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private static Texture2D alphaClearTexture;
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private List<LightSource> lights;
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public bool LosEnabled = true;
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public bool LightingEnabled = true;
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public bool ObstructVision;
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private Texture2D visionCircle;
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private Dictionary<Hull, Color> hullAmbientLights;
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private Dictionary<Hull, Color> smoothedHullAmbientLights;
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private float ambientLightUpdateTimer;
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public LightManager(GraphicsDevice graphics, ContentManager content)
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{
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lights = new List<LightSource>();
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AmbientLight = new Color(20, 20, 20, 255);
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visionCircle = Sprite.LoadTexture("Content/Lights/visioncircle.png");
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//visionCircle = new Sprite("Content/Lights/visioncircle.png", new Vector2(0.2f, 0.5f));
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var pp = graphics.PresentationParameters;
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lightMap = new RenderTarget2D(graphics,
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(int)(GameMain.GraphicsWidth*lightmapScale), (int)(GameMain.GraphicsHeight*lightmapScale), false,
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pp.BackBufferFormat, pp.DepthStencilFormat, pp.MultiSampleCount,
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RenderTargetUsage.DiscardContents);
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losTexture = new RenderTarget2D(graphics, (int)(GameMain.GraphicsWidth*lightmapScale), (int)(GameMain.GraphicsHeight*lightmapScale), false, SurfaceFormat.Color, DepthFormat.None);
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#if WINDOWS
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LosEffect = content.Load<Effect>("losshader");
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#else
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losEffect = content.Load<Effect>("losshader_opengl");
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#endif
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if (lightEffect == null)
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{
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lightEffect = new BasicEffect(GameMain.Instance.GraphicsDevice);
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lightEffect.VertexColorEnabled = true;
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lightEffect.TextureEnabled = true;
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lightEffect.Texture = LightSource.LightTexture;
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}
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hullAmbientLights = new Dictionary<Hull, Color>();
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smoothedHullAmbientLights = new Dictionary<Hull, Color>();
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if (alphaClearTexture == null)
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{
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alphaClearTexture = TextureLoader.FromFile("Content/Lights/alphaOne.png");
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}
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}
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public void AddLight(LightSource light)
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{
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lights.Add(light);
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}
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public void RemoveLight(LightSource light)
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{
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lights.Remove(light);
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}
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public void OnMapLoaded()
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{
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foreach (LightSource light in lights)
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{
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light.NeedsHullCheck = true;
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light.NeedsRecalculation = true;
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}
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}
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public void Update(float deltaTime)
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{
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if (ambientLightUpdateTimer > 0.0f)
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{
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ambientLightUpdateTimer -= deltaTime;
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}
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else
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{
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CalculateAmbientLights();
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ambientLightUpdateTimer = AmbientLightUpdateInterval;
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}
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foreach (Hull hull in hullAmbientLights.Keys)
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{
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if (!smoothedHullAmbientLights.ContainsKey(hull))
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{
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smoothedHullAmbientLights.Add(hull, Color.TransparentBlack);
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}
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}
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foreach (Hull hull in smoothedHullAmbientLights.Keys.ToList())
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{
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Color targetColor = Color.TransparentBlack;
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hullAmbientLights.TryGetValue(hull, out targetColor);
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smoothedHullAmbientLights[hull] = Color.Lerp(smoothedHullAmbientLights[hull], targetColor, deltaTime);
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}
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}
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public void UpdateLightMap(GraphicsDevice graphics, SpriteBatch spriteBatch, Camera cam, Effect blur)
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{
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if (!LightingEnabled) return;
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graphics.SetRenderTarget(lightMap);
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Rectangle viewRect = cam.WorldView;
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viewRect.Y -= cam.WorldView.Height;
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//clear to some small ambient light
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graphics.Clear(AmbientLight);
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graphics.BlendState = BlendState.Additive;
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spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.Additive, null, null, null, null, cam.Transform * Matrix.CreateScale(new Vector3(lightmapScale, lightmapScale, 1.0f)));
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Matrix transform = cam.ShaderTransform
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* Matrix.CreateOrthographic(GameMain.GraphicsWidth, GameMain.GraphicsHeight, -1, 1) * 0.5f;
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Vector3 offset = Vector3.Zero;// new Vector3(Submarine.MainSub.DrawPosition.X, Submarine.MainSub.DrawPosition.Y, 0.0f);
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foreach (LightSource light in lights)
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{
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if (light.Color.A < 1 || light.Range < 1.0f || !light.Enabled) continue;
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if (!MathUtils.CircleIntersectsRectangle(light.WorldPosition, light.Range, viewRect)) continue;
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light.Draw(spriteBatch, lightEffect, transform);
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}
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lightEffect.World = Matrix.CreateTranslation(offset) * transform;
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GameMain.ParticleManager.Draw(spriteBatch, false, null, Particles.ParticleBlendState.Additive);
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foreach (Hull hull in smoothedHullAmbientLights.Keys)
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{
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if (smoothedHullAmbientLights[hull].A < 0.01f) continue;
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var drawRect =
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hull.Submarine == null ?
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hull.Rect :
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new Rectangle((int)(hull.Submarine.DrawPosition.X + hull.Rect.X), (int)(hull.Submarine.DrawPosition.Y + hull.Rect.Y), hull.Rect.Width, hull.Rect.Height);
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GUI.DrawRectangle(spriteBatch,
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new Vector2(drawRect.X, -drawRect.Y),
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new Vector2(hull.Rect.Width, hull.Rect.Height),
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smoothedHullAmbientLights[hull], true);
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}
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if (Character.Controlled != null)
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{
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if (Character.Controlled.FocusedItem != null)
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{
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Character.Controlled.FocusedItem.IsHighlighted = true;
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}
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if (Character.Controlled.FocusedCharacter != null)
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{
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Character.Controlled.FocusedCharacter.Draw(spriteBatch);
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}
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foreach (Item item in Item.ItemList)
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{
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if (item.IsHighlighted)
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{
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item.Draw(spriteBatch, false, true);
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}
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}
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Vector2 drawPos = Character.Controlled.DrawPosition;
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drawPos.Y = -drawPos.Y;
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//ambient light decreases the brightness of the halo (no need for a bright halo if the ambient light is bright enough)
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float ambientBrightness = (AmbientLight.R + AmbientLight.B + AmbientLight.G) / 255.0f / 3.0f;
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Color haloColor = Color.White * (1.0f - ambientBrightness);
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spriteBatch.Draw(
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LightSource.LightTexture, drawPos, null, haloColor * 0.4f, 0.0f,
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new Vector2(LightSource.LightTexture.Width / 2, LightSource.LightTexture.Height / 2), 1.0f, SpriteEffects.None, 0.0f);
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}
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spriteBatch.End();
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graphics.SetRenderTarget(null);
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graphics.BlendState = BlendState.AlphaBlend;
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}
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public void UpdateObstructVision(GraphicsDevice graphics, SpriteBatch spriteBatch, Camera cam, Vector2 lookAtPosition)
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{
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if (!LosEnabled && !ObstructVision) return;
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graphics.SetRenderTarget(losTexture);
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spriteBatch.Begin(SpriteSortMode.Deferred, null, null, null, null, null, cam.Transform * Matrix.CreateScale(new Vector3(lightmapScale, lightmapScale, 1.0f)));
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if (ObstructVision)
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{
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graphics.Clear(Color.Black);
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Vector2 diff = lookAtPosition - ViewTarget.WorldPosition;
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diff.Y = -diff.Y;
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float rotation = MathUtils.VectorToAngle(diff);
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Vector2 scale = new Vector2(
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MathHelper.Clamp(diff.Length() / 256.0f, 2.0f, 5.0f), 2.0f);
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spriteBatch.Draw(visionCircle, new Vector2(ViewTarget.WorldPosition.X, -ViewTarget.WorldPosition.Y), null, Color.White, rotation,
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new Vector2(LightSource.LightTexture.Width * 0.2f, LightSource.LightTexture.Height / 2), scale, SpriteEffects.None, 0.0f);
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}
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else
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{
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graphics.Clear(Color.White);
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}
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spriteBatch.End();
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//--------------------------------------
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if (LosEnabled && ViewTarget != null)
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{
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Vector2 pos = ViewTarget.WorldPosition;
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Rectangle camView = new Rectangle(cam.WorldView.X, cam.WorldView.Y - cam.WorldView.Height, cam.WorldView.Width, cam.WorldView.Height);
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Matrix shadowTransform = cam.ShaderTransform
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* Matrix.CreateOrthographic(GameMain.GraphicsWidth, GameMain.GraphicsHeight, -1, 1) * 0.5f;
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var convexHulls = ConvexHull.GetHullsInRange(viewTarget.Position, cam.WorldView.Width*0.75f, viewTarget.Submarine);
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if (convexHulls != null)
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{
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List<VertexPositionColor> shadowVerts = new List<VertexPositionColor>();
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List<VertexPositionTexture> penumbraVerts = new List<VertexPositionTexture>();
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foreach (ConvexHull convexHull in convexHulls)
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{
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if (!convexHull.Enabled || !convexHull.Intersects(camView)) continue;
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Vector2 relativeLightPos = pos;
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if (convexHull.ParentEntity?.Submarine != null) relativeLightPos -= convexHull.ParentEntity.Submarine.Position;
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convexHull.CalculateShadowVertices(relativeLightPos, true);
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//convert triangle strips to a triangle list
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for (int i = 0; i < convexHull.shadowVertexCount * 2 - 2; i++)
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{
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if (i % 2 == 0)
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{
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shadowVerts.Add(convexHull.ShadowVertices[i]);
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shadowVerts.Add(convexHull.ShadowVertices[i + 1]);
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shadowVerts.Add(convexHull.ShadowVertices[i + 2]);
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}
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else
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{
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shadowVerts.Add(convexHull.ShadowVertices[i]);
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shadowVerts.Add(convexHull.ShadowVertices[i + 2]);
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shadowVerts.Add(convexHull.ShadowVertices[i + 1]);
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}
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}
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penumbraVerts.AddRange(convexHull.PenumbraVertices);
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}
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ConvexHull.shadowEffect.World = shadowTransform;
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ConvexHull.shadowEffect.CurrentTechnique.Passes[0].Apply();
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graphics.DrawUserPrimitives(PrimitiveType.TriangleList, shadowVerts.ToArray(), 0, shadowVerts.Count / 3, VertexPositionColor.VertexDeclaration);
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ConvexHull.penumbraEffect.World = shadowTransform;
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ConvexHull.penumbraEffect.CurrentTechnique.Passes[0].Apply();
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graphics.DrawUserPrimitives(PrimitiveType.TriangleList, penumbraVerts.ToArray(), 0, penumbraVerts.Count / 3, VertexPositionTexture.VertexDeclaration);
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}
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}
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graphics.SetRenderTarget(null);
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}
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private void CalculateAmbientLights()
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{
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hullAmbientLights.Clear();
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foreach (LightSource light in lights)
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{
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if (light.Color.A < 1f || light.Range < 1.0f) continue;
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var newAmbientLights = AmbientLightHulls(light);
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foreach (Hull hull in newAmbientLights.Keys)
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{
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if (hullAmbientLights.ContainsKey(hull))
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{
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//hull already lit by some other light source -> add the ambient lights up
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hullAmbientLights[hull] = new Color(
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hullAmbientLights[hull].R + newAmbientLights[hull].R,
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hullAmbientLights[hull].G + newAmbientLights[hull].G,
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hullAmbientLights[hull].B + newAmbientLights[hull].B,
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hullAmbientLights[hull].A + newAmbientLights[hull].A);
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}
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else
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{
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hullAmbientLights.Add(hull, newAmbientLights[hull]);
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}
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}
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}
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}
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/// <summary>
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/// Add ambient light to the hull the lightsource is inside + all adjacent hulls connected by a gap
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/// </summary>
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private Dictionary<Hull, Color> AmbientLightHulls(LightSource light)
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{
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Dictionary<Hull, Color> hullAmbientLight = new Dictionary<Hull, Color>();
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var hull = Hull.FindHull(light.WorldPosition);
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if (hull == null) return hullAmbientLight;
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return AmbientLightHulls(hull, hullAmbientLight, light.Color * (light.Range / 2000.0f));
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}
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/// <summary>
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/// A flood fill algorithm that adds ambient light to all hulls the starting hull is connected to
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/// </summary>
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private Dictionary<Hull, Color> AmbientLightHulls(Hull hull, Dictionary<Hull, Color> hullAmbientLight, Color currColor)
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{
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if (hullAmbientLight.ContainsKey(hull))
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{
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if (hullAmbientLight[hull].A > currColor.A)
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return hullAmbientLight;
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else
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hullAmbientLight[hull] = currColor;
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}
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else
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{
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hullAmbientLight.Add(hull, currColor);
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}
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Color nextHullLight = currColor * AmbientLightFalloff;
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//light getting too dark to notice -> no need to spread further
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if (nextHullLight.A < 20) return hullAmbientLight;
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//use hashset to make sure that each hull is only included once
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HashSet<Hull> hulls = new HashSet<Hull>();
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foreach (Gap g in hull.ConnectedGaps)
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{
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if (!g.IsRoomToRoom || !g.PassAmbientLight || g.Open < 0.5f) continue;
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hulls.Add((g.linkedTo[0] == hull ? g.linkedTo[1] : g.linkedTo[0]) as Hull);
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}
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foreach (Hull h in hulls)
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{
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hullAmbientLight = AmbientLightHulls(h, hullAmbientLight, nextHullLight);
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}
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return hullAmbientLight;
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}
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public void ClearLights()
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{
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lights.Clear();
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}
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}
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class CustomBlendStates
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{
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static CustomBlendStates()
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{
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Multiplicative = new BlendState();
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Multiplicative.ColorSourceBlend = Multiplicative.AlphaSourceBlend = Blend.Zero;
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Multiplicative.ColorDestinationBlend = Multiplicative.AlphaDestinationBlend = Blend.SourceColor;
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Multiplicative.ColorBlendFunction = Multiplicative.AlphaBlendFunction = BlendFunction.Add;
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WriteToAlpha = new BlendState();
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WriteToAlpha.ColorWriteChannels = ColorWriteChannels.Alpha;
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MultiplyWithAlpha = new BlendState();
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MultiplyWithAlpha.ColorDestinationBlend = MultiplyWithAlpha.AlphaDestinationBlend = Blend.One;
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MultiplyWithAlpha.ColorSourceBlend = MultiplyWithAlpha.AlphaSourceBlend = Blend.DestinationAlpha;
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LOS = new BlendState();
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LOS.ColorSourceBlend = LOS.AlphaSourceBlend = Blend.Zero;
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LOS.ColorDestinationBlend = LOS.AlphaDestinationBlend = Blend.InverseSourceColor;
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LOS.ColorBlendFunction = LOS.AlphaBlendFunction = BlendFunction.Add;
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}
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public static BlendState Multiplicative { get; private set; }
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public static BlendState WriteToAlpha { get; private set; }
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public static BlendState MultiplyWithAlpha { get; private set; }
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public static BlendState LOS { get; private set; }
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}
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}
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