本文详细介绍了如何在CodeBlocks IDE中设置现代OpenGL 3.2及以上版本，包括使用GLFW创建窗口，GLEW加载OpenGL API，以及GLM进行数学运算。教程覆盖了下载、配置和链接这些开源库的具体步骤。
Wednesday, May 8, 2013
Setup Modern OpenGL with GLFW, GLEW and GLM in Codeblocks
Modern OpenGL 3 and above version may be difficult especially for beginner because of new shaders and buffer object concepts. OpenGL 1.x is simple to understand and to setup the project also which you can find in my previous articles
here. By setting the
GLUT or just by including
gl.h and
glu.h we can acess the OpenGL function because all the API function are determined in compiled time but in modern OpenGL concept is different that all the API function are determined in run time not in compiled time.
Introduction to GLFW,GLEW and GLM
Lets discusses about all this open source library why they are necessary. GLEW (OpenGL Extension Wrangler ) will handle the run time loading of the OpenGL API. This will give access to the OpenGL 3.2 and above API functions. It is important because accessing OpenGL functions isn't as simple as #include <GL/gl.h> unless we want to use an ancient version of OpenGL. In modern OpenGL , the API functions are determined at run time,not compile time.
Lets discusses about all this open source library why they are necessary. GLEW (OpenGL Extension Wrangler ) will handle the run time loading of the OpenGL API. This will give access to the OpenGL 3.2 and above API functions. It is important because accessing OpenGL functions isn't as simple as #include <GL/gl.h> unless we want to use an ancient version of OpenGL. In modern OpenGL , the API functions are determined at run time,not compile time.
GLFW (OpenGL Frame Work
) is used to create a window, and receive mouse and keyboard input in a cross-platform way. We can use freeglut as a alternative of GLFW . GLFW is especially design for game. OpenGL does not handle window creation or input, so this must be done with the help of GLFW or other alternatives.
GLM(OpenGL Mathematics
) is a mathematics libray that handles vectors and metrices. Older versions of OpenGL provided functions like glRotate, glTranslate and glScale which would do some of the mathematics but in modern OpenGL previously mentioned functions do not exist and we have to do by ourselves. GLM will help us to do math.
Setup instruction for GLFW,GLEW and GLM
Step 1st : Download and Extract all these library
Step 2nd : Copy header files,library files and dll files to following directories.
A. Copy Header Files
Copy
glfw3.h, form GLFW library include folder, and
glew.h,glxew.h,wglew.h from GLEW library include folder to the directory
C:\Program Files\CodeBlocks\MinGW\include\GL
Since GLM is header only library copy the whole
glm folder to the directory
C:\Program Files\CodeBlocks\MinGW\include
B. Copy Library Files
Copy libglfw3.a and glfw3dll.a form GLFW library lib-mingw folder and glew32, glew32s, glew32mx, glew32mxs from GLEW library lib folder to the directory C:\Program Files\CodeBlocks\MinGW\lib
Copy libglfw3.a and glfw3dll.a form GLFW library lib-mingw folder and glew32, glew32s, glew32mx, glew32mxs from GLEW library lib folder to the directory C:\Program Files\CodeBlocks\MinGW\lib
C. Copy DILL Files
Copy
glfw3.dll form GLFW library lib-mingw folder, and
glew32.dll ,
glew32mx.dll from GLEW library bin folder to the directory
C:\Windows\System32
Step 3rd: Change
CodeBlocks linker setting
Open the Codeblocks IDE.
go to menu ->Settings->Compiler options
From there click the Linker setting tab.
From Link libraries box. Click add button and add libraries glew32.lib, glew32s.lib, libglfw3.a and libopengl32.a
All the linker must be link from the directory C:\Program Files\CodeBlocks\MinGW\lib Note: make sure that glew32s.lib must be top of the list.
Press ok . Now your library is completely setup. You can write modern OpenGL program by creating new empty cpp file. Check weather all libraries are setup successfully or not run the source code from here(simple modern OpenGL program)
Open the Codeblocks IDE.
go to menu ->Settings->Compiler options
From there click the Linker setting tab.
From Link libraries box. Click add button and add libraries glew32.lib, glew32s.lib, libglfw3.a and libopengl32.a
All the linker must be link from the directory C:\Program Files\CodeBlocks\MinGW\lib Note: make sure that glew32s.lib must be top of the list.
Press ok . Now your library is completely setup. You can write modern OpenGL program by creating new empty cpp file. Check weather all libraries are setup successfully or not run the source code from here(simple modern OpenGL program)
Posted by Dinesh Smokin at 8:44 AM
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到【灌水乐园】发言
Where do I find "libopengl.a" ?
ReplyDeleteinside the directory programfiles->codeblocks->Mingw->lib you can find
Deletesorry not libopengl.a it is libopengl32.a. I have edited my post.
DeleteWhen I download GLFW, I don't get glfw.dll. I get glfw3.dll and so on. In every file there is a 3 at the end. Am I downloading the wrong file or is it just a newer version?
ReplyDeleteyes it is new version release at june 17,2013.
DeleteOk, thanks for the answer. However, when I run the test-code I get loads of errors with GLFW, like "glfwOpenWindowHint was not declared in this scope" and so on. I've followed the instructions carefully, so I don't know what I'm doing wrong.
DeleteIn test-code there is #include so change it to $include and try. If this is not the problem then check wheather your GLFW is 64-bit and glew is 32-bit something like that. I suggest you although you computer is 64-bit use both GLFW and glew 32-bit.
DeleteIn latest GLFW use glfwWindowHint instead glfwOpenWindowHint
ReplyDeleteI think all of these need updating as their have been many function name and parameter changes.
ReplyDeleteThat and if the version number of the libraries was known it would help in removing the need to hunt and attempt to figure out what got changed to what in trying to get these samples running.
Either that or the removal of GLFW from the samples as it is the library causing the most headaches in trying to get these samples to run.
Thought the best sure fire way of having usable samples with minimal headache would be samples only using the glm Library,
as this would keep the dependance and setup simple and without the headache to many libraries that are getting updated constantly.
can you write a tutorial on using GLFW3 with GLew 1.10? The documentation is very vague on setting up a simple window.
ReplyDeleteThis site implements GLew 1.10, but it does a bit too much and eats up resources:
http://blog.gvnott.com/2013/05/18/tutorial-multiple-windows-with-glfw3-and-glew-mx/
i have been trying to get it running for quiet a while, is it possible to rar the whole directory of codeblocks and put it on the newsgroups ... thanks in advance
ReplyDeletegreetings
Dave
here(simple modern OpenGL program) program is not running. please help me. the error is given bellow
ReplyDelete||=== Build: Debug in dsf (compiler: GNU GCC Compiler) ===|
D:\openGL\dsf\main.cpp||In function 'void Render()':|
D:\openGL\dsf\main.cpp|125|error: too few arguments to function 'void glfwSwapBuffers(GLFWwindow*)'|
c:\program files (x86)\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.7.1\..\..\..\..\include\GL\glfw.h|2209|note: declared here|
D:\openGL\dsf\main.cpp||In function 'void AppMain()':|
D:\openGL\dsf\main.cpp|145|error: 'glfwOpenWindowHint' was not declared in this scope|
D:\openGL\dsf\main.cpp|147|error: 'GLFW_OPENGL_VERSION_MAJOR' was not declared in this scope|
D:\openGL\dsf\main.cpp|149|error: 'GLFW_OPENGL_VERSION_MINOR' was not declared in this scope|
D:\openGL\dsf\main.cpp|151|error: 'GLFW_WINDOW_NO_RESIZE' was not declared in this scope|
D:\openGL\dsf\main.cpp|153|error: 'GLFW_WINDOW' was not declared in this scope|
D:\openGL\dsf\main.cpp|153|error: 'glfwOpenWindow' was not declared in this scope|
D:\openGL\dsf\main.cpp|197|error: 'GLFW_OPENED' was not declared in this scope|
D:\openGL\dsf\main.cpp|197|error: 'glfwGetWindowParam' was not declared in this scope|
||=== Build failed: 9 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|
Same errors as the above guy ... Probably there are some changes in glfw.h (which in fact is glfw3.h) ...
ReplyDeleteI have updated the program now such error will not occur.
ReplyDeleteI did everything exactly as stated,but when i build and run the program ,nothing happens,it does not do anything.
ReplyDeleteDo you start with a empty project or a glfw project or something else ?
How is this going to work if you haven't put the location of the 'bin' files in codeblocks-> compiler-> toolchain executables-> additional paths ?
ReplyDeleteI did add link libraries
ReplyDeleteglew32s.lib
glew32.lib
libglfw3.a
libopengl32.a
and copy lib to CodeBlocks\MinGW\lib
but i cant build source. error is "cannot find -lglew32s.lib"
ERROR: "glm/glm.hpp no such file or directory"
ReplyDelete