{"action":"opened","issue":{"url":"https://api.github.com/repos/wangjwchn/MetalAcc/issues/4","repository_url":"https://api.github.com/repos/wangjwchn/MetalAcc","labels_url":"https://api.github.com/repos/wangjwchn/MetalAcc/issues/4/labels{/name}","comments_url":"https://api.github.com/repos/wangjwchn/MetalAcc/issues/4/comments","events_url":"https://api.github.com/repos/wangjwchn/MetalAcc/issues/4/events","html_url":"https://github.com/wangjwchn/MetalAcc/issues/4","id":196327102,"number":4,"title":"请问下如果多级处理链，纹理如果需要改变大小怎么做","user":{"login":"swlfigo","id":6550691,"avatar_url":"https://avatars.githubusercontent.com/u/6550691?v=3","gravatar_id":"","url":"https://api.github.com/users/swlfigo","html_url":"https://github.com/swlfigo","followers_url":"https://api.github.com/users/swlfigo/followers","following_url":"https://api.github.com/users/swlfigo/following{/other_user}","gists_url":"https://api.github.com/users/swlfigo/gists{/gist_id}","starred_url":"https://api.github.com/users/swlfigo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/swlfigo/subscriptions","organizations_url":"https://api.github.com/users/swlfigo/orgs","repos_url":"https://api.github.com/users/swlfigo/repos","events_url":"https://api.github.com/users/swlfigo/events{/privacy}","received_events_url":"https://api.github.com/users/swlfigo/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-12-19T04:02:37Z","updated_at":"2016-12-19T04:02:37Z","closed_at":null,"body":"最近想写个类似 gpuimage 的处理链，就是上级A生成一张纹理给下级B再处理，用的是 metal 文件用的是kernel开头的函数那种，如果我想上级A输出的纹理尺寸是(1000,1000)给下级，下级B再处理完生成(100 , 900)这种尺寸的, 我在MTLTextureDescriptor设置纹理尺寸了，但是生成出来的B纹理是A纹理的（100,900）位置裁剪，并不是将1000 1000 尺寸纹理 压缩画到 100 900 上面，请问下应该怎么设置呢，新手研究"}}
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