本文介绍了您可以从iOS C插件“当场"写入Unity纹理吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

假设您有一个适用于iOS的低级Unity插件，

Say you have a low-level Unity plugin for iOS,

所以在c#

using System.Runtime.InteropServices;
using AOT;

public class Teste: MonoBehaviour {

    [DllImport("__Internal")] private static extern
       void set_texture_from_unity(System.IntPtr texture, int w, int h);

具有纹理，.Apply()，然后将指针发送到本地iOS插件:

have a texture, .Apply() it, and then send the pointer to the native iOS plugin:

public void ClickPassTexture() {

    tex = new Texture2D(256, 256, TextureFormat.ARGB32, false);
    tex.filterMode = FilterMode.Point;

    tex.Apply(); // ACTUALLY UPLOAD TO GPU

    someMaterial.mainTexture = tex;

    set_texture_from_unity(
       tex.GetNativeTexturePtr(), tex.width, tex.height);
}

现在是C代码.

制作带有几条彩色线条的纹理，然后将其写入Unity纹理.

Make a texture with a few colored lines, and write it to the Unity texture.

#include <OpenGLES/ES2/gl.h>
...
void set_texture_from_unity(void *g_TextureHandle,  int w, int h)) {

    // make a texture with a few gray rows
    unsigned char* data = malloc( g_TextureWidth * 4 * g_TextureHeight );
    for (int i = 0; i < 1000; ++i) { data[i] = 100; }

    // now, write that to the texture pointer given to us from Unity
    GLuint gltex = (GLuint)(size_t)(g_TextureHandle);
    glBindTexture(GL_TEXTURE_2D, gltex);
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0,
      g_TextureWidth, g_TextureHeight, GL_RGBA, GL_UNSIGNED_BYTE, data);

    free(data);

因此，在C代码中，我们似乎已经成功地修改了纹理tex.

So, in the C code, we have seemingly successfully modified the texture tex.

但是.

图片显示完全无法完成任何操作.

精美的Unity doco docs.unity3d.com/Manual/NativePluginInterface.html

The fine Unity doco docs.unity3d.com/Manual/NativePluginInterface.html

给出一个示例，其中C纹理更改被Unity渲染链中的回调调用.

gives an example where the C texture change gets called by a callback in the Unity rendering chain.

但是.

何时我们想要?

我认为这可能很简单:

    set_texture_from_unity( tex.GetNativeTexturePtr(),
          tex.width, tex.height);
    // the plugin has changed the texture...
    // perhaps an Apply will change it on screen?!
    tex.Apply();

但是不！ (如果您在.Apply之前等待几帧，这没有什么区别.)

But no! (It makes no difference if you wait a few frames before the .Apply.)

您会认为.Apply会将纹理再次发送到GPU，但似乎不起作用.

You'd think .Apply would send the texture up to the gpu again, but it seems to not work.

简而言之，在C插件运行后，如何处理所显示的代码，以使其显示先有先有"的新纹理?

当您知道一个C插件已经修改了Texture时，如何在iOS上使用Unity来显示更改?

When you know a Texture has been modified by a C plugin, this on iOS, how to get Unity to display the change???

新" Unity中的解决方案

Unity Japan的(传奇人物)高桥敬次郎发表了有史以来Unity中最重要的一件事情:

Solution in the "new" Unity

The (legendary) Keijiro Takahashi from Unity Japan, has posted probably the single most important thing ever posted from Unity:

https://github.com/keijiro/TextureUpdateExample

( 新 )框架样式纹理从插件更新的实际示例.

它和IOS一起使用

AND IT WORKS WITH IOS

再说一遍，这几乎是Unity发行的最有价值的东西！！

Again, all that can be said is this pretty much the most valuable thing ever emitted from Unity! Phew!

关于所问的问题，我确实从未找到解决方法.

Regarding the question as asked, I really have never found the solution.

这篇关于您可以从iOS C插件“当场"写入Unity纹理吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

写入Unity纹理吗

您可以从iOS C插件“当场"写入Unity纹理吗?

问题描述

推荐答案

新" Unity中的解决方案

Solution in the "new" Unity