How can I bypass texture isReadable

Questions & Answers
1

Is there a way to copy a texture from the gfx card to system memory, thereby setting isReadable to true.

2

It is possible when using opengl.

in c

void EXPORT_API SetTexture(int textureID) 
{
	freopen("debug.txt", "a", stdout);
	printf("SetTexture id:%d

" ,textureID);

	glBindTexture(GL_TEXTURE_2D, textureID);

	glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &textureWidth);
	glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &textureHeight);
	printf("w:%d h:%d

" ,textureWidth ,textureHeight);

	buffer = (GLfloat *)malloc(textureWidth * textureHeight * (sizeof(GLfloat) * 4));
	glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, buffer);
}
	
bool EXPORT_API GetTexture(float* resultPixels, int* resultPixelLength)
{
	*resultPixelLength = (textureWidth * textureHeight) * 4;
	printf("GetTexture pixels%d

", resultPixelLength);

	for(int i = 0; i < *resultPixelLength; i++)
	{
		resultPixels[+i] = (float) buffer*;*

  •   }*

  •   count++;*

  •   return true;*

  • }*

  • void EXPORT_API FreeMemory()*

  • {*

  •   printf("

");*

  •   //delete(buffer);*

  •   free(buffer);*

  •   //free(bufferTest);*

  • }*

  • void EXPORT_API Close()*

  • {*

  •   fclose (stdout);*

  • }*
    in c#
    [DllImport(“Unity3dTextureSteal”)]
    private static extern void SetTexture(int textureId);
    [DllImport(“Unity3dTextureSteal”)]
    private static extern bool GetTexture(System.IntPtr ptrResultVerts, ref int resultVertLength);
    [DllImport(“Unity3dTextureSteal”)]
    private static extern void FreeMemory();
    [DllImport(“Unity3dTextureSteal”)]
    private static extern void Close();
    public static Texture2D FindTexture(Texture2D tex)
    {
    //Debug.Log(tex.name + " " + tex.format);
    SetTexture(tex.GetNativeTextureID());
    float[] pix = new float[tex.width * tex.height * 4];
    int resultVertLength = 0;
    GCHandle pArray = GCHandle.Alloc(pix, GCHandleType.Pinned);
    if (GetTexture(pArray.AddrOfPinnedObject(), ref resultVertLength))
    {
    pArray.Free();
    Color[] colors = new Color[tex.width * tex.height];
    //Debug.Log(pix.Length + " " + resultVertLength);
    int i, c;
    for (c = 0, i = 0; c < colors.Length; c++)
    {
    Color co = new Color();
    co[0] = pix*;*
    i++;
    co[1] = pix*;*
    i++;
    co[2] = pix*;*
    i++;
    co[3] = pix*;*
    i++;
    colors
    ```c
    * = co;
    }

        Texture2D texture = new Texture2D(tex.width, tex.height, TextureFormat.RGBA32, false);
    texture.SetPixels(colors, 0);
    texture.Apply(false);

    FreeMemory();

    return texture;
}
return null;

    }
    _```*_