osg学习（五十四）PNG lib warning : Interlace handling should be turned on when using png_read_image
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应打开隔行处理。用PS打开png图片后在保存时，把交错选项勾选“无”。
PNG lib warning : Interlace handling should be turned on when using png_read_image
VERTEX glCompileShader "" FAILED
VERTEX Shader "" infolog:
0(6) : error C5060: out can't be used with non-varying texCoord
0(6) : error C5060: out can't be used with non-varying texCoord
(0) : error C2003: incompatible options for link
Warning: detected OpenGL error 'invalid operation' at after pcp->apply(Unfiorm&) in GLObjectsVisitor::apply(osg::StateSet& stateset), unifrom name: tile_xyz
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