Unity把Texture2D复制到坐标点击处的Texture2D

今天做一个画图程序，类似给一个白纸，
然后用类似印章的图形点哪里就在哪里出现。

Unity在处理Texture2D上只有对像素进行操作，
所以要用到GL的一些方法，执行效率可能会更高。

代码比较简单，直接贴上应该能看懂。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;//复制一个Texture到另外一个Texture.
public class CDrawTexture : MonoBehaviour
{Material nowMat;    Texture2D nowTexture;   //当前纹理RectInt nowWH;  //宽高Color clearColor = new Color(0f, 0f, 0f, 0f);   //清除的色值public void InitDrawTexture(){nowMat = PrefabList.inst.SpriteDefault;}public Texture2D CreateNewTexture(int w, int h){Clear();nowWH = new RectInt(0, 0, w, h);nowTexture = new Texture2D(w, h);FillColor(nowTexture, clearColor);return nowTexture;}public void Clear(){if (nowTexture != null){DestroyImmediate(nowTexture);}}public Texture2D CopyTexture(Texture2D source,Vector3 penpos){RenderTexture renderTexture = RenderTexture.GetTemporary(nowWH.width, nowWH.height);RenderTexture.active = renderTexture;//清空 GLGL.Clear(false, true, clearColor);//把source渲染到GLRenderGLStuff(nowWH.width, nowWH.height, nowMat, nowTexture, nowWH.width, nowWH.height, -new Vector3(nowWH.width, nowWH.height,0f)/2);//把目标渲染到GLRenderGLStuff(nowWH.width, nowWH.height, nowMat, source, source.width, source.height, penpos * globalData.pixUnit);//读取 RenderTexture 到材质 nowTexturenowTexture.ReadPixels(new Rect(0, 0, nowWH.width, nowWH.height), 0, 0);nowTexture.Apply();RenderTexture.active = null;RenderTexture.ReleaseTemporary(renderTexture);return nowTexture;}//把某个颜色填充static void FillColor(Texture2D t, Color c){RenderTexture renderTexture = RenderTexture.GetTemporary(t.width, t.height);RenderTexture.active = renderTexture;GL.Clear(false, true, c);//读取 RenderTexture 到材质 nowTexturet.ReadPixels(new Rect(0, 0, t.width, t.height), 0, 0);t.Apply();RenderTexture.active = null;RenderTexture.ReleaseTemporary(renderTexture);}/// <summary>/// 把一个Texture复制到另外一个Texture/// </summary>/// <param name="width">目标纹理大小</param>/// <param name="height">目标纹理大小</param>/// <param name="material"></param>/// <param name="source">复制的纹理</param>/// <param name="sw">复制的纹理宽</param>/// <param name="sh">复制的纹理高</param>/// <param name="penpos">鼠标位置</param>static void RenderGLStuff(int width, int height, Material material, Texture2D source, float sw, float sh, Vector3 penpos){material.SetPass(0);GL.PushMatrix();//GL入栈GL.LoadPixelMatrix(0, width, height, 0);Graphics.DrawTexture(new Rect(0, 0, 0, 0), source);GL.LoadOrtho(); //转换为正交投影变换GL.Begin(GL.QUADS);float szWidth = sw / width;float szHeight = sh / height;Vector2 at = new Vector2((penpos.x + width / 2f) / width, (penpos.y + height / 2f) / height);GL.TexCoord2(0, 0); GL.Vertex3(at.x + 0f, at.y + 0f, 0f);   //设置纹理和顶点坐标GL.TexCoord2(1, 0); GL.Vertex3(at.x + szWidth, at.y + 0f, 0f);GL.TexCoord2(1, 1); GL.Vertex3(at.x + szWidth, at.y + szHeight, 0f);GL.TexCoord2(0, 1); GL.Vertex3(at.x + 0f, at.y + szHeight, 0f);GL.End();GL.PopMatrix(); //GL出栈}
}

在其他脚本调用:

public void PaintXY(Vector3 pos){if (nowTool == null)return;pos.z = Mathf.Abs(nowMaskObj.transform.position.z - myCamera.transform.position.z);Vector3 at = myCamera.ScreenToWorldPoint(pos);Vector3 lo = nowMaskObj.transform.InverseTransformPoint(at);gameRoot.inst.drawTexture.CopyTexture(PrefabList.inst.tPen,lo);//Debug.Log("PaintXY :" + lo );checkValue = true;}

下面是写代码中遇到的一些知识点，总结在下面。

如果只是对纹理的复制，可以用下面的方法

        if (SystemInfo.copyTextureSupport == UnityEngine.Rendering.CopyTextureSupport.None){//High GC allocs hereColor[] pixelBuffer = source.GetPixels((int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height);nowTexture.SetPixels(pixelBuffer);nowTexture.Apply();}else{Graphics.CopyTexture(source, 0, 0, (int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height, nowTexture, 0, 0, 0, 0);}

另外关于Graphics.DrawTexture的一些高级用法，也研究了下，并做一些记录。

public static void DrawTexture(Rect screenRect, Texture texture, Material mat = null, int pass = -1);
public static void DrawTexture(Rect screenRect, Texture texture, int leftBorder, int rightBorder, int topBorder, int bottomBorder, Material mat = null, int pass = -1);
public static void DrawTexture(Rect screenRect, Texture texture, Rect sourceRect, int leftBorder, int rightBorder, int topBorder, int bottomBorder, Material mat = null, int pass = -1);
public static void DrawTexture(Rect screenRect, Texture texture, Rect sourceRect, int leftBorder, int rightBorder, int topBorder, int bottomBorder, Color color, Material mat = null, int pass = -1);
ParametersscreenRect    Rectangle on the screen to use for the texture. In pixel coordinates with (0,0) in the upper-left corner.
texture Texture to draw.
sourceRect  Region of the texture to use. In normalized coordinates with (0,0) in the bottom-left corner.
leftBorder  Number of pixels from the left that are not affected by scale.
rightBorder Number of pixels from the right that are not affected by scale.
topBorder   Number of pixels from the top that are not affected by scale.
bottomBorder    Number of pixels from the bottom that are not affected by scale.
color   Color that modulates the output. The neutral value is (0.5, 0.5, 0.5, 0.5). Set as vertex color for the shader.
mat Custom Material that can be used to draw the texture. If null is passed, a default material with the Internal-GUITexture.shader is used.
pass    If -1 (default), draws all passes in the material. Otherwise, draws given pass only.

这里的sourRect参数可以实现复制纹理中的部分，例如图集中的一块。
但是这里要注意，在这里踩了大坑。一直搞不对，原来这个参数的范围是0~1之间的。文档中竟然只字未提，可恶，只是说0,0点是左下角。下来的4个Border应该是9宫格用法了，没用上，直接写0就好了。

下面是一个测试例子。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class NewBehaviourScript : MonoBehaviour
{Rect rect = new Rect(1034, 644, 445, 606);Rect nowWH = new Rect(0, 0, 445, 606);public Texture2D nowTexture;   //当前纹理public SpriteRenderer sprite;public Texture2D source;// Start is called before the first frame updatevoid Start(){nowTexture = new Texture2D((int)nowWH.width, (int)nowWH.height, TextureFormat.ARGB32, false);Sprite nowMaskSprite = Sprite.Create(nowTexture, new Rect(0, 0, nowTexture.width, nowTexture.height), new Vector2(0.5f, 0.5f));sprite.sprite = nowMaskSprite;}void OnGUI(){if (Event.current.type.Equals(EventType.Repaint)){//Graphics.DrawTexture(new Rect(0f, 0f, 800, 800), text);RenderTexture renderTexture = RenderTexture.GetTemporary((int)nowWH.width, (int)nowWH.height, 0);RenderTexture.active = renderTexture;//清空 GLGL.Clear(false, true, Color.clear);Rect x = new Rect(rect.x / source.width, ((source.height - rect.y- rect.height) / source.height), (rect.width ) / source.width, rect.height/ source.height);GL.PushMatrix();//GL入栈//使用Graphics类直接进行Texture绘制时，由于属于直接绘制到平面上，//所以需要转换到平面像素空间内，所以需要用到LoadPixelMatrix方法GL.LoadPixelMatrix(0, nowWH.width, nowWH.height,0);// (int)(r.x*r.width/2048), r.width, r.height, (int)(r.y * r.height / 2048));//x = new Rect(0f, 0f, 1f, 1f);Graphics.DrawTexture(nowWH, source, x, 0, 0, 0, 0);GL.PopMatrix(); //GL出栈Rect s = new Rect(0f, 0f, 1f, 1f);nowTexture.ReadPixels(nowWH, 0, 0);nowTexture.Apply();RenderTexture.active = null;RenderTexture.ReleaseTemporary(renderTexture);}}
}

source是我做的一个测试图。

new Rect(1034, 644, 445, 606);
这个区域就是想获得的图片

运行效果

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