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A collection of simple single file OpenGL examples

License: zlib License

C++ 100.00%

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opengl-examples's Issues

Improvement: detach shaders

According to: http://gamedev.stackexchange.com/questions/47910/after-a-succesful-gllinkprogram-should-i-delete-detach-my-shaders

it seems better to detach and delete shaders vertex/geom/frag as soon as they get attached to the shader program than doing it at the end of the main.

Cannot find XInput in Ubuntu 14.04

I tried it on Ubuntu 14.04:

ondrej@eagle:~/repos/OpenGL-Examples/build(master)$ cmake ..
-- The C compiler identification is GNU 4.8.2
-- The CXX compiler identification is GNU 4.8.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Looking for XOpenDisplay in /usr/lib/x86_64-linux-gnu/libX11.so;/usr/lib/x86_64-linux-gnu/libXext.so
-- Looking for XOpenDisplay in /usr/lib/x86_64-linux-gnu/libX11.so;/usr/lib/x86_64-linux-gnu/libXext.so - found
-- Looking for gethostbyname
-- Looking for gethostbyname - found
-- Looking for connect
-- Looking for connect - found
-- Looking for remove
-- Looking for remove - found
-- Looking for shmat
-- Looking for shmat - found
-- Found X11: /usr/lib/x86_64-linux-gnu/libX11.so
-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libGL.so  
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Found Doxygen: /usr/bin/doxygen (found version "1.8.6") 
-- Using X11 for window creation
-- Using GLX for context creation
CMake Error at glfw/CMakeLists.txt:234 (message):
  The XInput library and headers were not found


-- Configuring incomplete, errors occurred!
See also "/home/ondrej/repos/OpenGL-Examples/build/CMakeFiles/CMakeOutput.log".
See also "/home/ondrej/repos/OpenGL-Examples/build/CMakeFiles/CMakeError.log".

But the package xinput is installed in my Ubuntu

Unable to `make`

$ make
[  3%] Built target glxw
[ 24%] Built target glfw
Linking CXX executable 00skeleton
/usr/bin/ld: glxw/libglxw.a(glxw.c.o): undefined reference to symbol 'dlclose@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [00skeleton] Error 1
make[1]: *** [CMakeFiles/00skeleton.dir/all] Error 2
make: *** [all] Error 2
zsh: exit 2     make
$

failed to open window

When I try to execute the compiled examples (e.g. 01shader_vbo1) I only get

failed to open window

Do you have any idea what the problem might be?

Trouble building on Ubuntu 15.04, 64 bit

It seems to be complaining that GLXW/glxw.h is missing ..

 build  master +  $ make
Scanning dependencies of target glfw
[  1%] Building C object glfw/src/CMakeFiles/glfw.dir/clipboard.c.o
[  2%] Building C object glfw/src/CMakeFiles/glfw.dir/context.c.o
[  3%] Building C object glfw/src/CMakeFiles/glfw.dir/gamma.c.o
[  5%] Building C object glfw/src/CMakeFiles/glfw.dir/init.c.o
[  6%] Building C object glfw/src/CMakeFiles/glfw.dir/input.c.o
[  7%] Building C object glfw/src/CMakeFiles/glfw.dir/joystick.c.o
[  9%] Building C object glfw/src/CMakeFiles/glfw.dir/monitor.c.o
[ 10%] Building C object glfw/src/CMakeFiles/glfw.dir/time.c.o
[ 11%] Building C object glfw/src/CMakeFiles/glfw.dir/window.c.o
[ 13%] Building C object glfw/src/CMakeFiles/glfw.dir/x11_clipboard.c.o
[ 14%] Building C object glfw/src/CMakeFiles/glfw.dir/x11_gamma.c.o
[ 15%] Building C object glfw/src/CMakeFiles/glfw.dir/x11_init.c.o
[ 17%] Building C object glfw/src/CMakeFiles/glfw.dir/x11_monitor.c.o
[ 18%] Building C object glfw/src/CMakeFiles/glfw.dir/x11_window.c.o
[ 19%] Building C object glfw/src/CMakeFiles/glfw.dir/x11_unicode.c.o
[ 21%] Building C object glfw/src/CMakeFiles/glfw.dir/linux_joystick.c.o
[ 22%] Building C object glfw/src/CMakeFiles/glfw.dir/posix_time.c.o
[ 23%] Building C object glfw/src/CMakeFiles/glfw.dir/posix_tls.c.o
[ 25%] Building C object glfw/src/CMakeFiles/glfw.dir/glx_context.c.o
Linking C static library libglfw3.a
[ 25%] Built target glfw
Scanning dependencies of target 00skeleton
[ 26%] Building CXX object CMakeFiles/00skeleton.dir/00skeleton.cpp.o
/mnt/data/home/stu/projects/tutorials/OpenGL-Examples/00skeleton.cpp:8:23: fatal error: GLXW/glxw.h: No such file or directory
 #include <GLXW/glxw.h>
                       ^
compilation terminated.
CMakeFiles/00skeleton.dir/build.make:54: recipe for target 'CMakeFiles/00skeleton.dir/00skeleton.cpp.o' failed
make[2]: *** [CMakeFiles/00skeleton.dir/00skeleton.cpp.o] Error 1
CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/00skeleton.dir/all' failed
make[1]: *** [CMakeFiles/00skeleton.dir/all] Error 2
Makefile:117: recipe for target 'all' failed
make: *** [all] Error 2

Mac OS compilation

I tried to compile the samples on my Mac (OS X El Capitan version 10.11.6). By following the documentation, the cmake .. step worked fine but during compilation, I got the following error:

[ 91%] Generating include/KHR/khrplatform.h
Downloading KHR/khrplatform.h from http://www.khronos.org/registry/egl/api/KHR/khrplatform.h to /Users/gbittoun/Documents/OpenGL-Examples/build/glxw/include/KHR/khrplatform.h
[ 92%] Generating include/GLES2/gl2.h, include/GLES2/gl2ext.h, include/GLES2/gl2platform.h
Downloading GLES2/gl2.h from http://www.khronos.org/registry/gles/api/GLES2/gl2.h to /Users/gbittoun/Documents/OpenGL-Examples/build/glxw/include/GLES2/gl2.h
Downloading GLES2/gl2platform.h from http://www.khronos.org/registry/gles/api/GLES2/gl2platform.h to /Users/gbittoun/Documents/OpenGL-Examples/build/glxw/include/GLES2/gl2platform.h
Downloading GLES2/gl2ext.h from http://www.khronos.org/registry/gles/api/GLES2/gl2ext.h to /Users/gbittoun/Documents/OpenGL-Examples/build/glxw/include/GLES2/gl2ext.h
[ 92%] Generating src/glxw_es2.c, include/GLXW/glxw_es2.h
Parsing header gl2ext.h
Generating header /Users/gbittoun/Documents/OpenGL-Examples/build/glxw/include/GLXW/glxw_es2.h
Generating library source /Users/gbittoun/Documents/OpenGL-Examples/build/glxw/src/glxw_es2.c
Scanning dependencies of target glxw_es2
[ 93%] Building C object glxw/CMakeFiles/glxw_es2.dir/src/glxw_es2.c.o
/Users/gbittoun/Documents/OpenGL-Examples/build/glxw/src/glxw_es2.c:3:10: fatal error: 'EGL/egl.h' file not found
#include <EGL/egl.h>
         ^
1 error generated.
make[2]: *** [glxw/CMakeFiles/glxw_es2.dir/src/glxw_es2.c.o] Error 1
make[1]: *** [glxw/CMakeFiles/glxw_es2.dir/all] Error 2
make: *** [all] Error 2

I looked for this egl.h file on my computer and it seems that it indeed doesn’t exist or at least, not in a directory named EGL. I could find it in the directory /opt/X11/include/GLES. I tried to copy it in the include dir of glxw… without success.

Is there a way to compile these examples on mac ? I don’t renounce to make them work, I’ll open a pull request if I find a correct way to fix this.

failed to open window

All examples just say:

ondrej@eagle:~/repos/OpenGL-Examples/build(master)$ ./00skeleton 
failed to open window

It's caused by this part:

    // create a window
    GLFWwindow *window;
    if((window = glfwCreateWindow(width, height, "00skeleton", 0, 0)) == 0) {
        std::cerr << "failed to open window" << std::endl;
        glfwTerminate();
        return 1;
    }

But I don't know how to fix it.

syntax error?

Hi,
I have build these projects with CodeBlocks and MinGW on windows.
Everything is correct except compute shader nbody.
I have some errors in Code Blocks:

||=== Build: all in OPENGLEXAMPLES (compiler: GNU GCC Compiler) ===|
E:\Lab\OpenGL-Examples\13compute_shader_nbody.cpp||In function 'int main()':|
E:\Lab\OpenGL-Examples\13compute_shader_nbody.cpp|368|error: taking address of temporary array|
CMakeFiles\13compute_shader_nbody.dir\build.make|54|recipe for target 'CMakeFiles/13compute_shader_nbody.dir/13compute_shader_nbody.cpp.obj' failed|
CMakeFiles\Makefile2|636|recipe for target 'CMakeFiles/13compute_shader_nbody.dir/all' failed|
E:\Lab\OpenGL-Examples\build\Makefile|116|recipe for target 'all' failed|
||=== Build failed: 4 error(s), 0 warning(s) (0 minute(s), 3 second(s)) ===|

I suspect line 368

glBindBuffersBase(GL_SHADER_STORAGE_BUFFER, 0, 2, (const GLuint[]){positions_vbo, velocities_vbo});

Please give me some advice how fix this line.

Compile error happens on MacOS

fatal error: 'KHR/khrplatform.h' file not found

build$ make
Scanning dependencies of target glxw
[ 1%] Building C object glxw/CMakeFiles/glxw.dir/src/glxw.c.o
In file included from /Users/anonymous/git/OpenGL/OpenGL-Examples/build/glxw/src/glxw.c:1:
In file included from /Users/anonymous/git/OpenGL/OpenGL-Examples/build/glxw/include/GLXW/glxw.h:7:
/Users/anonymous/git/OpenGL/OpenGL-Examples/build/glxw/include/GL/glcorearb.h:82:10: fatal error: 'KHR/khrplatform.h' file not found
#include <KHR/khrplatform.h>
^~~~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [glxw/CMakeFiles/glxw.dir/src/glxw.c.o] Error 1
make[1]: *** [glxw/CMakeFiles/glxw.dir/all] Error 2
make: *** [all] Error 2

Failed to open window on some examples

I reckon this is because it's not getting the opengl version it wants, any chance of some more error reporting ?

These ones got the error:

./11tesselation
./12shader_image_load_store
./13compute_shader_nbody

BTW, these are all all very nice examples :)

progschj / opengl-examples Goto Github PK

opengl-examples's People

Contributors

Stargazers

Watchers

Forkers

opengl-examples's Issues

Improvement: detach shaders

Cannot find XInput in Ubuntu 14.04

Unable to `make`

failed to open window

Trouble building on Ubuntu 15.04, 64 bit

Mac OS compilation

failed to open window

syntax error?

Compile error happens on MacOS

fatal error: 'KHR/khrplatform.h' file not found

Failed to open window on some examples

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