mirror of
https://github.com/maxartz15/VolumetricLighting.git
synced 2024-11-14 02:35:36 +01:00
328 lines
8.4 KiB
C#
328 lines
8.4 KiB
C#
using UnityEngine;
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using UnityEngine.Rendering;
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using System.Collections.Generic;
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[ExecuteInEditMode]
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public class TubeLight : MonoBehaviour
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{
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public float m_Intensity = 0.8f;
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public Color m_Color = Color.white;
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public float m_Range = 10.0f;
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public float m_Radius = 0.3f;
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public float m_Length = 0.0f;
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[HideInInspector]
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public Mesh m_Sphere;
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[HideInInspector]
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public Mesh m_Capsule;
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[HideInInspector]
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public Shader m_ProxyShader;
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Material m_ProxyMaterial;
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public bool m_RenderSource = false;
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Renderer m_SourceRenderer;
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Transform m_SourceTransform;
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Mesh m_SourceMesh;
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float m_LastLength = -1;
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public const int maxPlanes = 2;
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[HideInInspector]
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public TubeLightShadowPlane[] m_ShadowPlanes = new TubeLightShadowPlane[maxPlanes];
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bool m_Initialized = false;
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MaterialPropertyBlock m_props;
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const float kMinRadius = 0.001f;
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bool renderSource {get{return m_RenderSource && m_Radius >= kMinRadius;}}
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Dictionary<Camera, CommandBuffer> m_Cameras = new Dictionary<Camera, CommandBuffer>();
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static CameraEvent kCameraEvent = CameraEvent.AfterLighting;
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void Start()
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{
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if(!Init())
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return;
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UpdateMeshesAndBounds();
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}
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bool Init()
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{
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if (m_Initialized)
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return true;
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// Sometimes on editor startup (especially after project upgrade?), Init() gets called
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// while m_ProxyShader, m_Sphere or m_Capsule is still null/hasn't loaded.
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if (m_ProxyShader == null || m_Sphere == null || m_Capsule == null)
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return false;
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// Proxy
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m_ProxyMaterial = new Material(m_ProxyShader);
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m_ProxyMaterial.hideFlags = HideFlags.HideAndDontSave;
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// Source
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m_SourceMesh = Instantiate<Mesh>(m_Capsule);
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m_SourceMesh.hideFlags = HideFlags.HideAndDontSave;
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// Can't create the MeshFilter here, since for some reason the DontSave flag has
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// no effect on it. Has to be added to the prefab instead.
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//m_SourceMeshFilter = gameObject.AddComponent<MeshFilter>();
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MeshFilter mfs = gameObject.GetComponent<MeshFilter>();
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// Hmm, causes trouble
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// mfs.hideFlags = HideFlags.HideInInspector;
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mfs.sharedMesh = m_SourceMesh;
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// A similar problem here.
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// m_SourceRenderer = gameObject.AddComponent<MeshRenderer>();
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m_SourceRenderer = gameObject.GetComponent<MeshRenderer>();
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m_SourceRenderer.enabled = true;
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// We want it to be pickable in the scene view, so no HideAndDontSave
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// Hmm, causes trouble
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// m_SourceRenderer.hideFlags = HideFlags.DontSave | HideFlags.HideInInspector;
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m_SourceTransform = transform;
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m_Initialized = true;
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return true;
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}
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void OnEnable()
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{
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if(m_props == null)
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m_props = new MaterialPropertyBlock();
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if(!Init())
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return;
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UpdateMeshesAndBounds();
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}
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void OnDisable()
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{
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if(!Application.isPlaying)
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Cleanup();
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else
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for(var e = m_Cameras.GetEnumerator(); e.MoveNext();)
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if(e.Current.Value != null)
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e.Current.Value.Clear();
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}
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void OnDestroy()
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{
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if (m_ProxyMaterial != null)
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DestroyImmediate(m_ProxyMaterial);
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if (m_SourceMesh != null)
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DestroyImmediate(m_SourceMesh);
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Cleanup();
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}
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void Cleanup()
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{
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for(var e = m_Cameras.GetEnumerator(); e.MoveNext();)
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{
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var cam = e.Current;
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if(cam.Key != null && cam.Value != null)
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cam.Key.RemoveCommandBuffer (kCameraEvent, cam.Value);
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}
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m_Cameras.Clear();
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}
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void UpdateMeshesAndBounds()
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{
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// Sanitize
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m_Range = Mathf.Max(m_Range, 0);
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m_Radius = Mathf.Max(m_Radius, 0);
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m_Length = Mathf.Max(m_Length, 0);
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m_Intensity = Mathf.Max(m_Intensity, 0);
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Vector3 sourceSize = renderSource ? Vector3.one * m_Radius * 2.0f : Vector3.one;
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if (m_SourceTransform.localScale != sourceSize || m_Length != m_LastLength)
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{
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m_LastLength = m_Length;
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Vector3[] vertices = m_Capsule.vertices;
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for (int i = 0; i < vertices.Length; i++)
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{
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if (renderSource)
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vertices[i].y += Mathf.Sign(vertices[i].y) * (- 0.5f + 0.25f * m_Length / m_Radius);
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else
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vertices[i] = Vector3.one * 0.0001f;
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}
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m_SourceMesh.vertices = vertices;
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}
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m_SourceTransform.localScale = sourceSize;
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float range = m_Range + m_Radius;
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// TODO: lazy for now, should draw a tight capsule
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range += 0.5f * m_Length;
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range *= 1.02f;
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range /= m_Radius;
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m_SourceMesh.bounds = new Bounds(Vector3.zero, Vector3.one * range);
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}
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void Update()
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{
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if(!Init())
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return;
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UpdateMeshesAndBounds();
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if(Application.isPlaying)
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for(var e = m_Cameras.GetEnumerator(); e.MoveNext();)
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if(e.Current.Value != null)
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e.Current.Value.Clear();
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}
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Color GetColor()
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{
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if (QualitySettings.activeColorSpace == ColorSpace.Gamma)
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return m_Color * m_Intensity;
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return new Color(
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Mathf.GammaToLinearSpace(m_Color.r * m_Intensity),
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Mathf.GammaToLinearSpace(m_Color.g * m_Intensity),
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Mathf.GammaToLinearSpace(m_Color.b * m_Intensity),
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1.0f
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);
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}
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void OnWillRenderObject()
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{
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if(InsideShadowmapCameraRender())
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return;
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if(!Init())
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return;
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// TODO: This is just a very rough guess. Need to properly calculate the surface emission
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// intensity based on light's intensity.
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m_props.SetVector("_EmissionColor", m_Color * Mathf.Sqrt(m_Intensity) * 2.0f);
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m_SourceRenderer.SetPropertyBlock(m_props);
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SetUpCommandBuffer();
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}
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void SetUpCommandBuffer()
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{
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Camera cam = Camera.current;
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CommandBuffer buf = null;
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if (!m_Cameras.ContainsKey(cam))
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{
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buf = new CommandBuffer();
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buf.name = gameObject.name;
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m_Cameras[cam] = buf;
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cam.AddCommandBuffer(kCameraEvent, buf);
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cam.depthTextureMode |= DepthTextureMode.Depth;
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}
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else
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{
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buf = m_Cameras[cam];
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buf.Clear();
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}
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Transform t = transform;
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Vector3 lightAxis = t.up;
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Vector3 lightPos = t.position - 0.5f * lightAxis * m_Length;
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buf.SetGlobalVector("_LightPos", new Vector4(lightPos.x, lightPos.y, lightPos.z, 1.0f/(m_Range*m_Range)));
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buf.SetGlobalVector("_LightAxis", new Vector4(lightAxis.x, lightAxis.y, lightAxis.z, 0.0f));
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buf.SetGlobalFloat("_LightAsQuad", 0);
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buf.SetGlobalFloat("_LightRadius", m_Radius);
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buf.SetGlobalFloat("_LightLength", m_Length);
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buf.SetGlobalVector("_LightColor", GetColor());
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SetShadowPlaneVectors(buf);
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float range = m_Range + m_Radius;
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// TODO: lazy for now, should draw a tight capsule
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range += 0.5f * m_Length;
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range *= 1.02f;
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range /= m_Radius;
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Matrix4x4 m = Matrix4x4.Scale(Vector3.one * range);
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buf.DrawMesh(m_Sphere, t.localToWorldMatrix * m, m_ProxyMaterial, 0, 0);
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}
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public TubeLightShadowPlane.Params[] GetShadowPlaneParams(ref TubeLightShadowPlane.Params[] p)
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{
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if (p == null || p.Length != maxPlanes)
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p = new TubeLightShadowPlane.Params[maxPlanes];
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for(int i = 0; i < maxPlanes; i++)
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{
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TubeLightShadowPlane sp = m_ShadowPlanes[i];
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p[i].plane = sp == null ? new Vector4(0, 0, 0, 1) : sp.GetShadowPlaneVector();
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p[i].feather = sp == null ? 1 : sp.feather;
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}
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return p;
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}
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TubeLightShadowPlane.Params[] sppArr = new TubeLightShadowPlane.Params[maxPlanes];
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void SetShadowPlaneVectors(CommandBuffer buf)
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{
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var p = GetShadowPlaneParams(ref sppArr);
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for (int i = 0, n = p.Length; i < n; ++i)
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{
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var spp = p[i];
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if(i == 0) {
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buf.SetGlobalVector("_ShadowPlane0", spp.plane);
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buf.SetGlobalFloat("_ShadowPlaneFeather0", spp.feather);
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} else if(i == 1) {
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buf.SetGlobalVector("_ShadowPlane1", spp.plane);
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buf.SetGlobalFloat("_ShadowPlaneFeather1", spp.feather);
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} else {
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buf.SetGlobalVector("_ShadowPlane" + i, spp.plane);
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buf.SetGlobalFloat("_ShadowPlaneFeather" + i, spp.feather);
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}
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}
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}
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void OnDrawGizmosSelected()
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{
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if (m_SourceTransform == null)
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return;
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Gizmos.color = Color.white;
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// Skip the scale
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Matrix4x4 m = new Matrix4x4();
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m.SetTRS(m_SourceTransform.position, m_SourceTransform.rotation, Vector3.one);
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Gizmos.matrix = m;
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Gizmos.DrawWireSphere(Vector3.zero, m_Radius + m_Range + 0.5f * m_Length);
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Vector3 start = 0.5f * Vector3.up * m_Length;
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Gizmos.DrawWireSphere(start, m_Radius);
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if (m_Length == 0.0f)
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return;
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Vector3 end = - 0.5f * Vector3.up * m_Length;
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Gizmos.DrawWireSphere(end, m_Radius);
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Vector3 r = Vector3.forward * m_Radius;
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Gizmos.DrawLine(start + r, end + r);
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Gizmos.DrawLine(start - r, end - r);
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r = Vector3.right * m_Radius;
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Gizmos.DrawLine(start + r, end + r);
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Gizmos.DrawLine(start - r, end - r);
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}
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void OnDrawGizmos()
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{
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// TODO: Looks like this changed the name. Find a more robust way to use the icon.
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// Gizmos.DrawIcon(transform.position, "PointLight Gizmo_MIP0.png", true);
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}
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bool InsideShadowmapCameraRender()
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{
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RenderTexture target = Camera.current.targetTexture;
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return target != null && target.format == RenderTextureFormat.Shadowmap;
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}
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}
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