Re: [Flightgear-devel] Problems Compiling clouds3d

[Erik Hofman]

Paul Deppe wrote:

Paul Deppe wrote:

When compiling CVS simgear/sky/clouds3d I am getting numerous warnings:
"WIN32 redefined", "initialization from int to float", "... is

implicitly a

typename",  and many others, and finally the following error

when compiling

SkyTextureState.cpp:

SkyTextureState.cpp:94: `glActiveTextureARB' undeclared (first use this
  function)

Erik wrote:

I know there is a fix in SimGear to include glext.h for windows
platforms. Maybe one of the ifdefs fails (because a version number
changed or something like that)?

Erik,

Here are some of the references to EXTGL_NEEDED in the SimGear root
directory:

-- configure.ac:

AM_CONDITIONAL(EXTGL_NEEDED, test "x$ac_cv_header_windows_h" = "xyes")

It looks like this is for windows/MSVC compilers only, but Norman might know more about it.

extgl.h is #include'd by SkyTextureState.cpp via SkyTextureState.hpp via
SkyContext.hpp.  It looks like all the ifdef's are working properly.  So I
am stumped here - why can't the compiler see the declaration of
glActiveTextureARB() when compiling SkyTextureState.cpp?  I'm missing
something.

Could it be you are linkijg against a wrong OpenGL library?
It looks like glActiveTextureARB is an OpenGl 1.3 extension, on the other hand, I have included a (compile time) check to see if glActiveTextureARB is actually supported by the system and neglect this code otherwise.

Could you check if GL_ARB_multitexture is defined in your gl.h header file?

Erik


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