创建MTLTexture对象时无法识别的选择器错误

Question

我使用以下代码创建了一个MTLTexture对象（为清楚起见，只列出了部分代码）。

int tmpbuf[4096]
id<MTLDevice> device = MTLCreateSystemDefaultDevice();
MTLTextureDescriptor* desc = [MTLTextureDescriptor    texture2DDescriptorWithPixelFormat: MTLPixelFormatA8Unorm  width: 64 height:64 mipmapped: NO];
id<MTLTexture> input_texture    = [device newTextureWithDescpriptor:desc];

//memory for the texture
MTLOrigin texture_origin = { 0, 0,  0};
MTLSize   texture_size   = {64, 64, 0};
MTLRegion texture_region = {texture_origin, texture_size}; 
[input_texture  replaceRegion: texture_region mipmaplevel: 0 withBytes: tmpbuf bytesPerRow: 64 ];

运行代码时：

id<MTLTexture> input_texture    = [device newTextureWithDescpriptor:desc];

错误[MTLIGAccelDevice newTextureWithDescpriptor:]: unrecognized selector sent to instance 0x7fd0a3012200 was reported.此代码已在OS X系统上编译和运行。我不知道为什么会发生这个错误。

Answer 1

确保首先在第一行的末尾添加;，然后为第三个MTLSize参数添加非空值。下面的代码片段在我的OS X 10.11.6机器上编译得很好。

    int tmpbuf[4096];
    id<MTLDevice> device = MTLCreateSystemDefaultDevice();
    MTLTextureDescriptor* desc = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat: MTLPixelFormatA8Unorm  width: 64 height:64 mipmapped: NO];
    id<MTLTexture> input_texture = [device newTextureWithDescriptor:desc];
    MTLOrigin texture_origin = { 0, 0,  0};
    MTLSize   texture_size   = {64, 64, 1};
    MTLRegion texture_region = {texture_origin, texture_size};
    [input_texture replaceRegion:texture_region mipmapLevel:0 withBytes:tmpbuf bytesPerRow:64];