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112 lines
3.9 KiB
C#
112 lines
3.9 KiB
C#
using System;
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using System.Collections;
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using TMPro;
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using UnityEngine;
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using UnityEngine.Rendering;
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namespace ConformalDecals.Text {
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[KSPAddon(KSPAddon.Startup.FlightAndEditor, true)]
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public class TextRenderer : MonoBehaviour {
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public static TextRenderer Instance {
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get {
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if (!_instance._isSetup) {
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_instance.Setup();
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}
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return _instance;
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}
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}
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public const TextureFormat TextTextureFormat = TextureFormat.Alpha8;
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public const RenderTextureFormat TextRenderTextureFormat = RenderTextureFormat.R8;
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private const string BlitShader = "ConformalDecals/TMP_Blit";
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private const int MaxTextureSize = 4096;
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private static TextRenderer _instance;
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private bool _isSetup;
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private TextMeshPro _tmp;
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private GameObject _cameraObject;
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private Camera _camera;
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private Material _blitMaterial;
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private void Start() {
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if (_instance._isSetup) {
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Debug.Log("[ConformalDecals] Duplicate TextRenderer created???");
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}
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Debug.Log("[ConformalDecals] Creating TextRenderer Object");
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_instance = this;
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DontDestroyOnLoad(gameObject);
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}
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public void Setup() {
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if (_isSetup) return;
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Debug.Log("[ConformalDecals] Setting Up TextRenderer Object");
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_tmp = gameObject.AddComponent<TextMeshPro>();
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_tmp.renderer.enabled = false; // dont automatically render
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_cameraObject = new GameObject("ConformalDecals text camera");
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_cameraObject.transform.parent = transform;
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_cameraObject.transform.SetPositionAndRotation(Vector3.back, Quaternion.identity);
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_camera = _cameraObject.AddComponent<Camera>();
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_camera.enabled = false; // dont automatically render
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_camera.orthographic = true;
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_camera.depthTextureMode = DepthTextureMode.None;
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_camera.nearClipPlane = 0.1f;
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_camera.farClipPlane = 2f;
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_isSetup = true;
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_blitMaterial = new Material(Shabby.Shabby.FindShader(BlitShader));
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}
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public Texture2D RenderToTexture(Texture2D texture2D, TMP_FontAsset font, string text, float fontSize, float pixelDensity) {
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// generate text mesh
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_tmp.SetText(text);
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_tmp.font = font;
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_tmp.fontSize = fontSize;
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_tmp.ForceMeshUpdate();
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// calculate camera and texture size
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var mesh = _tmp.mesh;
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var bounds = mesh.bounds;
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var width = Mathf.NextPowerOfTwo((int) (bounds.size.x * pixelDensity));
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var height = Mathf.NextPowerOfTwo((int) (bounds.size.y * pixelDensity));
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_camera.orthographicSize = height / pixelDensity / 2;
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_camera.aspect = (float) width / height;
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_cameraObject.transform.localPosition = new Vector3(bounds.center.x, bounds.center.y, -1);
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width = Mathf.Min(width, MaxTextureSize);
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height = Mathf.Max(height, MaxTextureSize);
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// setup render texture
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var renderTex = RenderTexture.GetTemporary(width, height, 0, TextRenderTextureFormat, RenderTextureReadWrite.Linear, 1);
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_camera.targetTexture = renderTex;
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// setup material
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_blitMaterial.SetTexture(PropertyIDs._MainTex, font.atlas);
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_blitMaterial.SetPass(0);
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// draw the mesh
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Graphics.DrawMeshNow(mesh, _tmp.renderer.localToWorldMatrix);
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var request = AsyncGPUReadback.Request(renderTex, 0, TextTextureFormat);
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request.WaitForCompletion();
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if (request.hasError) {
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throw new Exception("[ConformalDecals] Error encountered trying to request render texture data from the GPU!");
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}
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}
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}
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} |