Why do I get this error:
error C2065: ‘GL_MAX_EXT’ : undeclared identifier
when using glBlendEquationEXT? I would like to perform maximum intensity projection.
That means GL_MAX_EXT wasn’t defined in the headers you included.
Look here for the values: http://oss.sgi.com/projects/ogl-sample/registry/EXT/blend_minmax.txt