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This commit is contained in:
Kirill Chikalin
307
Assets/ru.chikalin/textdecal/Scripts/TextMeshProDecal.cs
Normal file
307
Assets/ru.chikalin/textdecal/Scripts/TextMeshProDecal.cs
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using System;
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using TMPro;
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using UnityEngine;
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using Object = UnityEngine.Object;
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namespace ru.chikalin.textdecal
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{
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[ExecuteAlways]
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[RequireComponent(typeof(TMP_Text))]
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[DefaultExecutionOrder(11)]
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[AddComponentMenu("Mesh/TextMeshPro - Decal")]
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[HelpURL("https://assetstore.unity.com/")] // todo
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#if UNITY_2021_2_OR_NEWER
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[Icon("Editor/Resources/Icons/sticker.png")] // todo
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#endif
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public class TextMeshProDecal : MonoBehaviour
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{
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private const int VolumetricVertexCount = 8;
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private const int VolumetricTrianglesCount = 36;
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private readonly int[] _volumetricTriangles =
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{
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0, 1, 2, //face front
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2, 3, 0,
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1, 5, 6, //face top
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6, 2, 1,
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3, 2, 6, //face right
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6, 7, 3,
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4, 5, 1, //face left
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1, 0, 4,
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4, 0, 3, //face back
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3, 7, 4,
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7, 6, 5, //face bottom
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5, 4, 7
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};
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[Tooltip("Volumetric mesh depth")] public float depth = 1;
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private Vector3 _depthVector;
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private TMP_Text _text;
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private Vector3[] _vertices;
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private int[] _triangles;
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private Color[] _colors;
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private Vector2[] _uv;
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private Vector2[] _uv2;
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private Vector2[] _uv4;
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private Vector2[] _uv5;
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private Vector2[] _uv6;
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private Vector2[] _uv7;
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private Vector2[] _uv8;
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private Mesh _volumetricMesh;
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private Mesh VolumetricMesh
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{
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get
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{
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if (_volumetricMesh != null) return _volumetricMesh;
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_volumetricMesh = new Mesh
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{
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hideFlags = HideFlags.HideAndDontSave
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};
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#if DEVELOPMENT_BUILD || UNITY_EDITOR
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_volumetricMesh.name = "TextMeshPro Decal Mesh";
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#endif
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_volumetricMesh.MarkDynamic();
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return _volumetricMesh;
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}
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}
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private MeshFilter _meshFilter;
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private MeshFilter MeshFilter
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{
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get
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{
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if (_meshFilter != null) return _meshFilter;
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_meshFilter = GetComponent<MeshFilter>();
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if (_meshFilter != null) return _meshFilter;
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_meshFilter = gameObject.AddComponent<MeshFilter>();
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_meshFilter.hideFlags = HideFlags.HideInInspector | HideFlags.HideAndDontSave;
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return _meshFilter;
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}
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}
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private void Awake()
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{
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_text = GetComponent<TMP_Text>();
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}
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private void OnEnable()
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{
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UpdateDepthVector();
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_text.OnPreRenderText += OnPreRenderText;
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TMPro_EventManager.TEXT_CHANGED_EVENT.Add(OnTextChangedEvent);
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OnPreRenderText(_text.textInfo);
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}
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private void OnDisable()
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{
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TMPro_EventManager.TEXT_CHANGED_EVENT.Remove(OnTextChangedEvent);
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_text.OnPreRenderText -= OnPreRenderText;
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_text.ForceMeshUpdate();
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MeshFilter.sharedMesh = _text.mesh;
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if (_volumetricMesh != null)
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{
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DestroyImmediate(_volumetricMesh);
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}
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}
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private void OnTextChangedEvent(Object obj)
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{
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if (obj != _text || !string.IsNullOrEmpty(_text.text)) return;
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// force update if text is empty
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OnPreRenderText(_text.textInfo);
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}
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private void OnPreRenderText(TMP_TextInfo textInfo)
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{
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// todo remove
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if (_text.isVolumetricText)
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{
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var textMesh = _text.mesh;
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MeshFilter.sharedMesh = textMesh;
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}
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else
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{
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PrepareMeshData(textInfo);
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var characterIndex = 0;
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for (var i = 0; i < textInfo.characterCount; i++)
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{
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var characterInfo = textInfo.characterInfo[i];
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if (!characterInfo.isVisible) continue;
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var materialIndex = characterInfo.materialReferenceIndex;
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var meshInfo = textInfo.meshInfo[materialIndex];
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AddCharacter(characterInfo, meshInfo, characterIndex++);
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}
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UpdateMesh();
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}
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}
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/// <summary>
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/// Add volumetric mesh for a character
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/// </summary>
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/// <param name="charInfo">TextMesh character info</param>
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/// <param name="meshInfo">TextMesh mesh info</param>
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/// <param name="characterIndex">Character index</param>
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private void AddCharacter(TMP_CharacterInfo charInfo, TMP_MeshInfo meshInfo, int characterIndex)
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{
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var volumetricVertexIndex = characterIndex * VolumetricVertexCount;
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var vertexIndex = charInfo.vertexIndex;
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/*
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* copy TextMesh vertices
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*/
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var bl = meshInfo.vertices[vertexIndex + 0];
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var tl = meshInfo.vertices[vertexIndex + 1];
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var tr = meshInfo.vertices[vertexIndex + 2];
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var br = meshInfo.vertices[vertexIndex + 3];
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_vertices[volumetricVertexIndex + 0] = bl;
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_vertices[volumetricVertexIndex + 1] = tl;
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_vertices[volumetricVertexIndex + 2] = tr;
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_vertices[volumetricVertexIndex + 3] = br;
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/*
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* Extrude face to make a cube
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*/
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_vertices[volumetricVertexIndex + 4] = bl + _depthVector;
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_vertices[volumetricVertexIndex + 5] = tl + _depthVector;
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_vertices[volumetricVertexIndex + 6] = tr + _depthVector;
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_vertices[volumetricVertexIndex + 7] = br + _depthVector;
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/*
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* Fill volumetric triangles
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*/
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for (var i = 0; i < _volumetricTriangles.Length; i++)
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{
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_triangles[characterIndex * VolumetricTrianglesCount + i] = volumetricVertexIndex + _volumetricTriangles[i];
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}
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/*
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* Copy TextMesh UVs
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*/
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_uv[volumetricVertexIndex + 0] = charInfo.vertex_BL.uv;
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_uv[volumetricVertexIndex + 1] = charInfo.vertex_TL.uv;
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_uv[volumetricVertexIndex + 2] = charInfo.vertex_TR.uv;
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_uv[volumetricVertexIndex + 3] = charInfo.vertex_BR.uv;
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_uv[volumetricVertexIndex + 4] = charInfo.vertex_BL.uv;
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_uv[volumetricVertexIndex + 5] = charInfo.vertex_TL.uv;
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_uv[volumetricVertexIndex + 6] = charInfo.vertex_TR.uv;
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_uv[volumetricVertexIndex + 7] = charInfo.vertex_BR.uv;
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_uv2[volumetricVertexIndex + 0] = charInfo.vertex_BL.uv2;
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_uv2[volumetricVertexIndex + 1] = charInfo.vertex_TL.uv2;
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_uv2[volumetricVertexIndex + 2] = charInfo.vertex_TR.uv2;
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_uv2[volumetricVertexIndex + 3] = charInfo.vertex_BR.uv2;
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_uv2[volumetricVertexIndex + 4] = charInfo.vertex_BL.uv2;
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_uv2[volumetricVertexIndex + 5] = charInfo.vertex_TL.uv2;
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_uv2[volumetricVertexIndex + 6] = charInfo.vertex_TR.uv2;
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_uv2[volumetricVertexIndex + 7] = charInfo.vertex_BR.uv2;
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/*
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* Additional mesh data for decal shader
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*/
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// character bottom left vertex position
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var uv4 = new Vector2(bl.x, bl.y);
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// character bottom left UV
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var uv5 = charInfo.vertex_BL.uv;
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// character 3D size
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var width = Vector3.Distance(br, bl);
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var height = Vector3.Distance(tr, br);
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var uv6 = new Vector2(width, height);
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// character UV size
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var uvWidth = Vector2.Distance(charInfo.vertex_BR.uv, charInfo.vertex_BL.uv);
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var uvHeight = Vector2.Distance(charInfo.vertex_TR.uv, charInfo.vertex_BR.uv);
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var uv7 = new Vector2(uvWidth, uvHeight);
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// character 3D Z-rotation
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var angle = Vector3.SignedAngle(Vector3.up, tl - bl, Vector3.forward);
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var uv8 = Mathf.Deg2Rad * angle;
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for (var i = 0; i < VolumetricVertexCount; i++)
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{
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_uv4[volumetricVertexIndex + i] = uv4;
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_uv5[volumetricVertexIndex + i] = uv5;
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_uv6[volumetricVertexIndex + i] = uv6;
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_uv7[volumetricVertexIndex + i] = uv7;
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_colors[volumetricVertexIndex + i] = charInfo.color;
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_uv8[volumetricVertexIndex + i].x = uv8;
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}
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}
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private void UpdateMesh()
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{
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var mesh = VolumetricMesh;
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mesh.Clear();
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mesh.vertices = _vertices;
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mesh.triangles = _triangles;
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mesh.uv = _uv;
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mesh.uv2 = _uv2;
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mesh.colors = _colors;
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mesh.uv4 = _uv4;
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mesh.uv5 = _uv5;
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mesh.uv6 = _uv6;
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mesh.uv7 = _uv7;
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mesh.uv8 = _uv8;
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if (MeshFilter.sharedMesh != mesh)
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{
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MeshFilter.sharedMesh = mesh;
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}
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mesh.RecalculateBounds();
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mesh.MarkModified();
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}
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private void PrepareMeshData(TMP_TextInfo textInfo)
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{
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var size = textInfo.characterInfo.Length;
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var vertexSize = size * VolumetricVertexCount;
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UpdateArray(ref _vertices, vertexSize);
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UpdateArray(ref _triangles, size * VolumetricTrianglesCount);
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UpdateArray(ref _colors, vertexSize);
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UpdateArray(ref _uv, vertexSize);
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UpdateArray(ref _uv2, vertexSize);
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UpdateArray(ref _uv4, vertexSize);
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UpdateArray(ref _uv5, vertexSize);
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UpdateArray(ref _uv6, vertexSize);
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UpdateArray(ref _uv7, vertexSize);
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UpdateArray(ref _uv8, vertexSize);
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}
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private static void UpdateArray<T>(ref T[] array, int size)
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{
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if (array == null)
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{
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array = new T[size];
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return;
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}
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if (array.Length < size)
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{
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Array.Resize(ref array, size);
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}
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Array.Clear(array, 0, array.Length);
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}
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#if UNITY_EDITOR
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private void OnValidate()
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{
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if (_text != null)
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{
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_text.ForceMeshUpdate();
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}
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UpdateDepthVector();
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}
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#endif
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private void UpdateDepthVector() => _depthVector = new Vector3(0, 0, depth);
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}
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}
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