Regal GL

[caiiiycuk]

Hi! I want to try build project against regal gl. I does not found any success story how to do this. I successfully build project against Regal in native environment. After that I compile regal with emscripten without any problem. So, for now I have static libraries libRegalGLUT.a libRegallib.a. I can`t understand how I can disable build in opengl support.

And I have linking errors:

warning: unresolved symbol: glColor4ub

warning: unresolved symbol: glClipPlanef

warning: unresolved symbol: glPopMatrix

warning: unresolved symbol: glFogf

warning: unresolved symbol: glScalef

warning: unresolved symbol: glPointParameterfv

warning: unresolved symbol: glLoadMatrixf

warning: unresolved symbol: glTranslatef

warning: unresolved symbol: glFrustumf

warning: unresolved symbol: glDisableClientState

warning: unresolved symbol: glPointParameterf

warning: unresolved symbol: glAlphaFunc

warning: unresolved symbol: glFogfv

warning: unresolved symbol: glTexCoordPointer

warning: unresolved symbol: glColor4f

warning: unresolved symbol: glMultMatrixf

warning: unresolved symbol: glPointSize

warning: unresolved symbol: glTexEnvf

warning: unresolved symbol: glTexEnvi

warning: unresolved symbol: glEnableClientState

warning: unresolved symbol: glClientActiveTexture

warning: unresolved symbol: glColorPointer

warning: unresolved symbol: glPushMatrix

But I already added libRegallib.a to build stage, and as I can see this static lib contains at least glTexEnvf:

>> llvm-nm libRegallib.a | grep glTexEnvf

00000000000085f0 T glTexEnvf

0000000000008680 T glTexEnvfv

                 U glTexEnvf

                 U glTexEnvfv

0000000000007070 T plugin_glTexEnvf

00000000000070f0 T plugin_glTexEnvfv

So, I can`t understand why glTexEnvf is unresolver

[caiiiycuk]

*  I can`t understand how I can disable built in opengl support.

[Jukka Jylänki]

You don't want to disable built-in OpenGL when building with Regal, because Regal will tack on top of OpenGL ES 2.0. But you should build code without -s LEGACY_GL_EMULATION=1 linker flag, because when using Regal, Emscripten provided legacy GL emulation features are not needed. It could be the case that Regal needs more complete GLES2 options, in which case try building with -s FULL_ES2=1.

Try checking the link order of the -l items for Regal (or try using a link group). The order of the link items matters on command line, and this looks like perhaps they were specified in the wrong order. It is possible to specify items multiple times, so you can try duplicating the link files twice, i.e. try passing -lyourcode -lRegalGLUT -lRegallib -lyourcode -lRegalGLUT -lRegallib.

2017-01-25 17:46 GMT+02:00 caiiiycuk <caii...@gmail.com>:

*  I can`t understand how I can disable built in opengl support.

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[caiiiycuk]

Ok, I found where problem is. Regal should be compiled to emscripten with special options, I use this command:

emmake make -f Makefile SYSTEM=emscripten

After that, in lib folder of Regal you can find static libs for emscripten. This libs contains rgl* methods that replace original opengl api. So, I add GL/Regal.h and compile my project again. Project was builded without any error. But when I run it in browser I does not see anything, just black screen and no errors. This project renders graphics correctly without regal on LEGACY_GL_EMULATION=1, so I think that project code is fine and problem is in integration of regal into emscripten.

I try to use all flags LEGACY_GL_EMULATION=1 | FULL_ES2=1 | FULL_ES3 = 1 results are same - black screen. Funny thing that Regal use  LEGACY_GL_EMULATION=1 to build itself. I can`t understand how I can found where problem is. Any ideas?

Also I try to build project without linking Regal libs, only with headers, and when I run program then I have this errors:

xception thrown: ReferenceError: GL is not defined,ReferenceError: GL is not defined

    at Object.createContext

    at _glutCreateWindow

    at Object._main

    at Object.callMain

    at doRun

[Александр Гурьянов]

Finally, I integrate regal gl into emscripten. You should call RegalMakeCurrent((RegalSystemContext)1); to associate emscripten gl context with regal gl context. Like this:

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    glutInitWindowPosition(0, 0);

    glutInitWindowSize(width, height);

    glutCreateWindow("app");

    RegalMakeCurrent((RegalSystemContext)1);

    glutDisplayFunc(draw);

Now in logs I see that regal gl do the job, it is rendering the game scenes. However, I don`t see anything, I think it is because this errors:

    [.Offscreen-For-WebGL-0x3d6b0c429c00]GL ERROR :GL_INVALID_OPERATION : glDrawElements: attempt to access out of range vertices in attribute 0

Also regal report about non supported features:

    warning  | Regal does not support glClientActiveTexture for ES 2.0 - skipping.

    warning  | glDisable does not support GL_POINT_SPRITE for ES 2.0.

    warning  | Regal does not support glClientActiveTexture for ES 2.0 - skipping.

More over I build myproject+regal in native enviroment in force ES2.0 mode, and I see many graphical artifacts in rendering.

Regarding to emscripten docs:

    You can consider building the codebase against the Regal Desktop OpenGL emulation library. That project offers a more complete set of emulated Desktop OpenGL features on top of OpenGL ES 2.0. 

I think that this statement is incorrect, built-in LEGACY_GL_EMULATION is much better that emulation from regal. At least it works.

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С уважением, Гурьянов Александр

[Alon Zakai]

Thanks for the update. I edited those docs now to be less optimistic about regal. Too bad it doesn't work better. Sadly the regal repo doesn't show much activity in recent years either (unless development moved somewhere else?).

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С уважением, Гурьянов Александр

[Jukka Jylänki]

Vlad Vukicevic worked on getting Regal working some years ago, as did Chad Austin. Their forks can be found at https://github.com/vvuk/regal/commits/master and https://github.com/chadaustin/regal/commits/master. I do remember running some simple working demos from both of them. Chad had ported some AngelCode GL tutorials iirc. Perhaps one of those repos might have fixes that are needed. Regarding the error, I think it might be necessary to link with -s FULL_ES2=1, because Regal might expect to be able to render from client side arrays.

Sad to see about the Regal nonsupported features though, perhaps it's not that complete as we thought.