Multitexturing

[c_olin]

I am using GameTutorials.com's terrain multitexturing tutorial, and i copy and pasted the stuff i needed, but when i compiled, i get this error:
--------------------Configuration: lesson1 - Win32 Debug--------------------
Linking...
Lesson1.obj : error LNK2001: unresolved external symbol "void (__stdcall* glMultiTexCoord2fARB)(unsigned int,float,float)" (?glMultiTexCoord2fARB@@3P6GXIMM@ZA)
Lesson1.obj : error LNK2001: unresolved external symbol "void (__stdcall* glActiveTextureARB)(unsigned int)" (?glActiveTextureARB@@3P6GXI@ZA)
Debug/lesson1.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

lesson1.exe - 3 error(s), 0 warning(s)

WHAT DID I MISS??????


thanks!

[JanHH]

http://nomad.openglforums.com/part15.html

[c_olin]

i tried that website, but his sourcecode is messey!

can you please explain waht you need to declar before you do the other stuff!?!?

[JanHH]

you need to get the function pointer as they are extensions, this PFNGLMULTITEXARB.. stuff.

[c_olin]

i have that!

[JotDot]

You're using two variables that are not declared.

I think I found the tutorial you used. In main.h you probably copied this:
// Here are the multitexture function prototypes
typedef void (APIENTRY * PFNGLMULTITEXCOORD2FARBPROC) (GLenum target, GLfloat s, GLfloat t);
typedef void (APIENTRY * PFNGLACTIVETEXTUREARBPROC) (GLenum target);

// Here we extern our function pointers for multitexturing capabilities
extern PFNGLMULTITEXCOORD2FARBPROC glMultiTexCoord2fARB;
extern PFNGLACTIVETEXTUREARBPROC glActiveTextureARB;


Notice the function pointers are extern. You must have forgot to copy the declarations of those two variables in main.cpp:

// Our function pointers for the ARB multitexturing functions
PFNGLMULTITEXCOORD2FARBPROC glMultiTexCoord2fARB = NULL;
PFNGLACTIVETEXTUREARBPROC glActiveTextureARB = NULL;

Add those two in one of your cpp files and you should be ok.