MTLTextureDescriptor *textureDescriptor = [[MTLTextureDescriptor alloc] init];
textureDescriptor.textureType = inTexture.textureType;
textureDescriptor.pixelFormat = inTexture.pixelFormat;
textureDescriptor.width = inTexture.width;
textureDescriptor.height = inTexture.height;
textureDescriptor.usage = inTexture.usage;
textureDescriptor.usage = MTLTextureUsageShaderRead | MTLTextureUsageShaderWrite; // the key statement solved the issue
applechang
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