GLIntercept 1.0 Beta

OpenGL OpenGL: Advanced Coding
1

A beta release of GLIntercept 1.0 is now out at:
http://glintercept.googlecode.com/files/GLIntercept1_0Beta00.exe

A few things to note:

  • This is more a maintainable release - new function entry points and some minor bug fixes.
  • OpenGL3.0 + pure core profiles do not work correctly (will be fixed)
  • New resource types like array textures, geometry shaders etc are not currently logged.
  • No x64 bit program support.
  • Nvidia’s multi threadded driver seems to issue an internal wglGetPixelFormat call on the first glGetError() after SwapBuffers. This internal call occurs on a different thread that does not have the main OpenGL conext - so it results in the OpenGL error:
    “GL ERROR - Function wglGetPixelFormat generated error GL_INVALID_OPERATION”
    for the first 23 times swap buffers is called.
    To fix, disable the multi-threadded driver from the Nvidia control panel:
    “Manage 3D settings -> Threadded Optimization -> Off”
    or you can enable the GLIntercept option “ThreadChecking = True” which will report the extra wglGetPixelFormat call occuring on a different thread. (as well as some other wglDescribePixelFormat calls made by the driver)

I will probably do a few more betas before the final, so hopefully a few of the above features/fixes will make it in.

As there are so many other OpenGL loggers on Windows these days I will probably not do too many more updates. (and OpenGL is a hard API to write a debugger for)

Let me know of any bugs you encounter.

2

Awesome!

3

Great! I use to use it few years back, it would be great to have it working for OpenGL 3.2 :smiley:

Maybe this should be in the Toolkits forum instead.

4

GLIntercept is one of my favourite GL Tools!

Thank you for working on it again!

5

As there are so many other OpenGL loggers on Windows these days I will probably not do too many more updates.

If you do decide to abandon it, could you at least document the code more thoroughly before you do? I took a cursory glance at the code once (to see what it would take to upgrade it to GL 3.x), and I couldn’t figure out what was going on with the inline assembly.

6

The only asm in the 0.5 src is the “#define WRAPPER_FUNCTION(n)” macro.
Here’s what it does:


int WrapperCall777(){ // notice "int" instead of "void"
	int idx = wrapperIndex[777];
	LogFunctionPre(idx,ALL_MY_ARGS);
	
	PROC extFunction = extFunctions[777]; // pointer to a function

	int result = extFunction(ALL_MY_ARGS); // arguments will automatically be correctly presented to it
	
	LogFunctionPost(idx,result);
	return result;
}



// At initialization, i.e this was done:
// extFunctions[777] = glUniformMatrix2x4fv;
7

Great work!!! I’ll check new version as soon as I can.

8

Great news and great work ! I’m using GLintercept 0.5 since it’s been out, and I’m fond of it !

Just saw this post, so could not test the v1.0 beta, does it include source code, or do you plan to use the googlecode svn ? It would be great that your great tool continues to live ‘after you’ :slight_smile:

Once more, great work and many thanks :slight_smile:

9

I’ll release source code for the final 1.0 release.

If you are curious, a source version that is almost the same is at
http://glintercept.googlecode.com/files/GLIntercept1.0_WIP00.7z

SVN is a possibility if other people start working on it. (have one other potential contributor)

10

I made a quick test on a huge app of ours and it certainly worked fine!

I have two points I’d like to improve :

  • shader edit mode can’t show shader usage if the framebuffer has sRGB enabled
  • shader editor can’t always recompile correctly programs that linked fro multiple shaders - as it recombines them in a single source, there may be duplicated uniform definitions or misplaced #version statements

these points could make a first contribution if you think it’s not’ too ambitious as a starting point :slight_smile: i did not look at the source code for now, so i’m clueless for now

cheers