GLEnableOutline & Gl Logging

Here's a quick way to get torque's GLEnableOutline() working on linux, and potentially mac os x (if you change the files for that platform too).

NOTE: There is no real reason why the code can't be platform independant; Its just that nobody seems to have gotten around to cleaning it up. Similar steps can be taken to clean out and make the GL Logger platform independant too.

We will be working in X86UNIXOGLVideo.cc :

Add to the top :

static bool outlineEnabled = false; // For outline code

Go to the "OpenGLDevice::swapBuffers()" function, and add the following line to the end of the function :

if (outlineEnabled) glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

NOTE: This will clear the screen each frame so the wireframe doesn't keep drawing over itself.

At the end, insert the following block of code :

// Backup functions (copied from GLCoreFunc.h)
#define GL_FUNCTION(fn_return,fn_name,fn_args,fn_value) fn_return (*fn_name)fn_args;
GL_FUNCTION(void,       orig_glDrawArrays, (GLenum mode, GLint first, GLsizei count), return; )
GL_FUNCTION(void,       orig_glDrawElements, (GLenum mode, GLsizei count, GLenum type, const GLvoid *indices), return; )

static U32 getIndex(GLenum type, const void *indices, U32 i)
{
   if(type == GL_UNSIGNED_BYTE)
      return ((U8 *) indices)[i];
   else if(type == GL_UNSIGNED_SHORT)
      return ((U16 *) indices)[i];
   else
      return ((U32 *) indices)[i];
}

Now find the following functions in platformWIN32, and copy them into the file in the corresponding order :

static U32 getIndex(GLenum type, const void *indices, U32 i);

NOTE: for the following, remove the "static" and "APIENTRY" keywords, replace "dllglDrawArrays" and "dllglDrawElements" with "orig_glDrawArrays" and "orig_glDrawElements", then remove the "dll" prefix on all the rest of function calls

static void  APIENTRY outlineDrawElements(GLenum mode, GLsizei count, GLenum type, const void *indices)
static void APIENTRY outlineDrawArrays(GLenum mode, GLint first, GLsizei count)

Finally, here's the console function for GLEnableOutline() :

ConsoleFunction(GLEnableOutline, void, 2, 2, "GLEnableOutline(bool);")
{
   argc;
   bool enable = dAtob(argv[1]);
   if(outlineEnabled == enable)
      return;

  /* if(enable && (loggingEnabled || perfEnabled))
      return;*/

   outlineEnabled = enable;

   if ( enable )
   {
      orig_glDrawArrays = glDrawArrays;
      orig_glDrawElements = glDrawElements;
      glDrawElements = outlineDrawElements;
      glDrawArrays = outlineDrawArrays;
   }
   else
   {
      glDrawElements = orig_glDrawElements;
      glDrawArrays = orig_glDrawArrays;
   }
}

I may roll these changes into a patch (in a more platform independant way of course), so stay tuned.