OpenGL 3.2 on Windows

support
1

opticfroggy wrote on Tuesday, July 24, 2012:

Hi,
I do the majority of my programming on my MBpro so I know that my setup works
fine there. I recently wanted to debug some OpenGL bits using geDebugger, as
well as confirm my cross-platform(ness).
When cloning my codebase down onto Win 7 I am having serious issues getting an
OpenGL 3.2 app to compile.

C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:62:26: error: 'glBindVertexArray' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:64:46: error: 'glBindBuffer' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:66:73: error: 'glVertexAttribPointer' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:69:41: error: 'glEnableVertexAttribArray' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:77:42: error: 'glDisableVertexAttribArray' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp: In member function 'void Actor::UpdateBuffers()':
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:172:36: error: 'glDeleteBuffers' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:177:37: error: 'glDeleteBuffers' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:182:34: error: 'glDeleteVertexArrays' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:194:30: error: 'glGenVertexArrays' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:196:26: error: 'glBindVertexArray' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:198:33: error: 'glGenBuffers' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:199:46: error: 'glBindBuffer' was not declared in this scope
C:\Users\Chris\workspace\OldYoungEngine\src\actors\Actor.cpp:200:78: error: 'glBufferData' was not declared in this scope
mingw32-make[2]: *** [CMakeFiles/main.dir/src/actors/Actor.cpp.obj] Error 1

This is the Errors I am getting and it would appear to be specifically GL3
related looking at the functions that are apparently not declared.

Any ideas ?
Anyone actually successfully get a 3.2 context to work on Windows 7 (Using
Eclipse project generated from CMake here, although whatever IDE etc isn’t
really important)

Thanks in advance!

2

elmindreda wrote on Tuesday, July 24, 2012:

GLFW does not provide an OpenGL header.

3

opticfroggy wrote on Tuesday, July 24, 2012:

From what I’ve read and seen from others experiences, getting Glew to work
with GLFW is a PITA.
I did try it early on when I was testing this, putting the GLEW include before
GLFW, but I still ran into issues of GLFW complaining about gl.h being
included before (or something to that affect).

It’s such a shame that this isn’t easier.

4

elmindreda wrote on Tuesday, July 24, 2012:

If you encounter any problems, or if you know where these discussions took
place, please make a post about it.

Lots of people use GLEW with GLFW with no problems and have for years, myself
included. If there are any issues, I’d like to know about them.

5

opticfroggy wrote on Tuesday, July 24, 2012:

This could be a stupid question :
Say I have this structure for e.g.

- Main.cpp
- Engine .h/.cpp
- Actors
– Actor.h/.cpp

Engine requires GLFW to do the normal initialisation etc.
Actor requires access to GL for drawing etc.

Currently (which work on OSX) before GLEW :

Actor.cpp
#include <GL/glfw.h>




Engine.h
#include <GL/glfw.h>
...
#include <Actors/Actor.h>

This works fine, obviously this is overly simplified.

Now that I’ve added GLEW to the mix should my includes look like this ?

Actor.cpp
#include <GL/glew.h>
#include <GL/glfw.h>




Engine.h
#include <GL/glew.h>
#include <GL/glfw.h>

This is what Is giving me the error : “GL/glew.h:84:2: error: #error gl.h
included before glew.h”

I know this is likely a really stupid / simple thing e.g. only including 'X’
once in place ‘Y’ instead of all over the place, else it may likely be a bad
habit I’ve picked up which is confusing me.

Thanks in advance for any pointers.

6

elmindreda wrote on Tuesday, July 24, 2012:

Are you absolutely certain you’re not including the GLFW header or an OpenGL
header before the GLEW one? The GLEW header has inclusion guards, so a second
inclusion of it wouldn’t cause any warnings at all, regardless of what was
included before.

7

opticfroggy wrote on Tuesday, July 24, 2012:

Hmm, yea after some following of includes I believe I got that sorted, however
a linker error has now presented itself (At-least I’m past compiler errors
lol)

E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0x240): undefined reference to `__imp__wglMakeCurrent@8'
mingw32-make[2]: Leaving directory `C:/Users/Chris/workspace/OldYoungEngine'
mingw32-make[1]: Leaving directory `C:/Users/Chris/workspace/OldYoungEngine'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0x251): undefined reference to `__imp__wglDeleteContext@4'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0xf99): undefined reference to `__imp__wglGetProcAddress@4'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0x1781): undefined reference to `__imp__wglMakeCurrent@8'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0x18c1): undefined reference to `__imp__wglCreateContext@4'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0x1d56): undefined reference to `__imp__glGetIntegerv@8'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_window.o):win32_window.c:(.text+0x1d6d): undefined reference to `__imp__glGetFloatv@8'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(glext.o):glext.c:(.text+0x1c0): undefined reference to `__imp__glGetIntegerv@8'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(glext.o):glext.c:(.text+0x1fb): undefined reference to `__imp__glGetIntegerv@8'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(glext.o):glext.c:(.text+0x2f0): undefined reference to `__imp__glGetIntegerv@8'
E:\Development\C++Libraries\glfw-2.7.6\lib-mingw\x86\libglfw.a(win32_glext.o):win32_glext.c:(.text+0x7e): undefined reference to `__imp__wglGetProcAddress@4'

As I referenced earlier I’m using CMake if that’s any help, MinGW and MSYS on
Win 7.

(Just to test I also tried linking against the VS lib “GLFW.lib” instead of
"libglfw.a")

8

elmindreda wrote on Tuesday, July 24, 2012:

You should read the section on using GLFW in the
readme file.