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117 lines
3.7 KiB
C#
117 lines
3.7 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using TMPro;
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using UnityEngine;
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using UnityEngine.Rendering;
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public class TextRenderTest : MonoBehaviour {
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//[InspectorButton("go")] public bool button;
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public Camera _camera;
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public GameObject _cameraObject;
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public TextMeshPro _tmp;
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public Material _blitMaterial;
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public Material _targetMaterial;
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public RenderTexture renderTex;
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private float pixelDensity = 8;
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private int MaxTextureSize = 4096;
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private static readonly int Decal = Shader.PropertyToID("_Decal");
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public const TextureFormat TextTextureFormat = TextureFormat.RG16;
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public const RenderTextureFormat TextRenderTextureFormat = RenderTextureFormat.R8;
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// Start is called before the first frame update
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void Start() {
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Debug.Log("starting...");
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StartCoroutine(OnRender());
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}
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// Update is called once per frame
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void Update() { }
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private IEnumerator OnRender() {
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Debug.Log("starting...2");
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// calculate camera and texture size
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_tmp.ForceMeshUpdate();
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var mesh = _tmp.mesh;
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mesh.RecalculateBounds();
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var bounds = mesh.bounds;
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Debug.Log(bounds.size);
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var width = bounds.size.x * pixelDensity;
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var height = bounds.size.y * pixelDensity;
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var widthPoT = Mathf.NextPowerOfTwo((int) width);
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var heightPoT = Mathf.NextPowerOfTwo((int) height);
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if (widthPoT > MaxTextureSize) {
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widthPoT /= widthPoT / MaxTextureSize;
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heightPoT /= widthPoT / MaxTextureSize;
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}
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if (heightPoT > MaxTextureSize) {
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widthPoT /= heightPoT / MaxTextureSize;
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heightPoT /= heightPoT / MaxTextureSize;
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}
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widthPoT = Mathf.Min(widthPoT, MaxTextureSize);
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heightPoT = Mathf.Min(heightPoT, MaxTextureSize);
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var widthRatio = widthPoT / width;
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var heightRatio = heightPoT / height;
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var sizeRatio = Mathf.Min(widthRatio, heightRatio);
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Debug.Log(sizeRatio);
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int scaledHeight = (int) (sizeRatio * height);
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int scaledWidth = (int) (sizeRatio * width);
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Debug.Log($"width = {scaledWidth}");
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Debug.Log($"height = {scaledHeight}");
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_camera.orthographicSize = scaledHeight / pixelDensity / 2;
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_camera.aspect = (float) widthPoT / heightPoT;
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_cameraObject.transform.localPosition = new Vector3(bounds.center.x, bounds.center.y, -1);
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var halfHeight = heightPoT / pixelDensity / 2 / sizeRatio;
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var halfWidth = widthPoT / pixelDensity / 2 / sizeRatio;
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var matrix = Matrix4x4.Ortho(bounds.center.x - halfWidth, bounds.center.x + halfWidth,
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bounds.center.y - halfHeight, bounds.center.y + halfHeight, -1, 1);
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// setup texture
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var texture = new Texture2D(widthPoT, heightPoT, TextTextureFormat, true);
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_targetMaterial.SetTexture(Decal, texture);
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// setup render texture
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renderTex = RenderTexture.GetTemporary(widthPoT, heightPoT, 0, TextRenderTextureFormat, RenderTextureReadWrite.Linear, 1);
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renderTex.autoGenerateMips = false;
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RenderTexture.active = renderTex;
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GL.PushMatrix();
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GL.LoadProjectionMatrix(matrix);
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_blitMaterial.SetPass(0);
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Graphics.DrawMeshNow(mesh, Matrix4x4.identity);
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GL.PopMatrix();
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// setup material
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_blitMaterial.mainTexture = _tmp.font.atlas;
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yield return null;
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RenderTexture.active = renderTex;
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texture.ReadPixels(new Rect(0, 0, widthPoT, heightPoT), 0, 0, true);
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texture.Apply(false, true);
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RenderTexture.ReleaseTemporary(renderTex);
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}
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} |