% Support for plugins and for builtin high performance image processing pipeline:
[ret1, ret2, ...] = Screen('HookFunction', windowPtr, 'Subcommand', 'HookName', arg1, arg2, ...);
proxyPtr = Screen('OpenProxy', windowPtr [, imagingmode]);
transtexid = Screen('TransformTexture', sourceTexture, transformProxyPtr [, sourceTexture2][, targetTexture][, specialFlags]);
调用 "Screen" 时，未对一个或多个输出参数赋值。
出错 Untitled2 (line 9)
[w,~]=Screen("OpenWindow",0,color,scrsize);