glCreateShader include directory?

OpenGL
1

I want to create a GLSL shader program, but my compiler says it cant find the function glCreateShader(), what file do i need to include for this function and other glsl shader functions?

2

Have you checked your gl.h file?
Do you maintain this yourself or do you use someone elses?

3

You need an OpenGL extension loading library to use them. Or you could write one yourself.

4

Thanks, I downloaded and installed GLEW and included the header. Now I get unresolved external linker errors. I’ve checked the gl.h file and it doesn’t contain a glCreateShader function.

5

Of course it doesn’t. When you use GLEW, you use glew.h, not gl.h. Did you read the directions?

6

Ok, sorry, I skimmed through the directions. I’m now only including glew.h and I’m still getting linker errors.

EDIT:
Actually I’ve just realised they are different.
Here is one.

unresolved external symbol __imp____glewUseProgram

I have got the GLEW dll in the system32 folder, the lib file in VC++'s lib folder, and the glew.h and wglew.h in the VC++'s include folder.

7

Did you actually link to the library? You know, have it listed in the “Linker/Input/Additional Dependencies” list of libraries to link with.

And it’s generally bad form to fling .dlls into the system folder and .libs into Visual Studio’s directories.

8

Of course! I forgot to link the lib files. Anyway I was following the instructions on the site which are obviously for older versions of VC++. Anyway I’ve now sorted put all of the lib files and headers in a seperate folder, edited the project’s “VC++ Directories” in it’s settings, put the dll in the working directory, and linked to the lib files. There are no more errors. Thanks.

EDIT:
Nope sorry, I’m getting a runtime error saying no more than…
“Unhandled exception at 0x00000000 in Upgraded Engine.exe: 0xC0000005: Access violation.”
This occurs when i use glCreateShader(GL_VERTEX_SHADER);
Forget about the runtime errors i fixed them. However the shader itself is just simply not doing anything, im still getting per vertex shading.

Nevermind again, it was faulty glsl, everything works now :smiley:

9

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