osg学习（五十七）double declaration in gles osg_ModelViewProjectionMatrix
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osg state convertVertexShaderSourceToOsgBuiltIns inserts these and the double declaration is causing an error in gles
osgEarth/ShaderUtils.cpp
void applySupportForNoFFPImpl(GLSLChunker::Chunks& chunks)
#if !defined(OSG_GL_FIXED_FUNCTION_AVAILABLE) && !defined(OSG_GLES3_AVAILABLE) //osg state convertVertexShaderSourceToOsgBuiltIns inserts these and the double declaration is causing an error in gles
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