Mirror of forum.nim-lang.org

1843 :: Is the opengl package currently broken?

• Varsias (orginal) [2015-12-06T00:05:05+01:00] view original

  I installed some fresh copies of the opengl and glfw wrappers via nimble today and tried to compile the following minimal example:

  
  import opengl
  import glfw/glfw
  
  
  glfw.init()
  
  var win = newGlWin(dim = (w: 640, h: 480), title = "Minimal example")
  win.makeContextCurrent()
  
  loadExtensions()
  
  win.destroy()
  glfw.terminate()
  Run

  Compilation aborts with the following error message: (file path)..\nimcache\nimgl.o:nimgl.c:(.text+0x957): undefined reference to 'nimLoadProcs0' Since this refers to the C code generated for the loadExtensions proc, my guess would be that something broke with the latest nim release and needs to be updated. I looked at the relevant lines calling nimLoadProcs0 in opengl.nim, but I don't really understand most of what's going on there, so I can't fix it myself. Any help regarding this particular problem would be appreciated.

---

• Kerp (orginal) [2015-12-06T03:01:39+01:00] view original

  try this code with the glfw3 package not the high level wrapper.

  
  import os, glfw/glfw3 as glfw
  import opengl
  
  
  
  #{.deadCodeElim: on.}
  
  enableAutoGLErrorCheck(true)
  
  
  proc main() =
    
    var Win: glfw.Window
    
    if glfw.Init() == cint(0):
       echo(" glfw did not init/n")
       quit()
    
    glfw.WindowHint(glfw.CONTEXT_VERSION_MAJOR,4)
    glfw.WindowHint(glfw.CONTEXT_VERSION_MINOR,3)
    #glfw.WindowHint(glfw.OPENGL_PROFILE,glfw.OPENGL_COMPAT_PROFILE)
    
    Win = glfw.CreateWindow(800.cint,600.cint,"Opengl Window",nil,nil)
    
    glfw.MakeContextCurrent(Win)
    
    loadExtensions()
    
    while glfw.WindowShouldClose(Win) == 0:
     
     glClear(GL_COLOR_BUFFER_BIT)
     glClearColor(0.5,0.0,0.1,1.0)
     
     glfw.SwapBuffers(Win)
     glfw.PollEvents()
  
  
  glfw.Terminate()
  
  main()
  
  Run

  i have gotten this to work u still have to compile the .dll to work with your compiler using cmake and glfw3

---

• Araq (orginal) [2015-12-06T11:48:59+01:00] view original

  I know of no such regression. However, if you don't use any extension, you must not call loadExtensions. This loadExtensions mess is hard to improve over, but thanks to it you get dead code elimination even with OpenGL's downright impertinent way of dynamic loading.

---