osg学习（57）重复声明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
}
针对gles的着色器程序，osgEarth所提供的着色器框架会在每个着色器文件版本号之后插入若干行代码，具体如下：
uniform mat4 osg_ModelViewMatrix;
uniform mat4 osg_ProjectionMatrix;
uni
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