#207 Add support to emscripten, flascc and nacl

[Anonymous]

These platforms uses opengl es 1/2 and have their own limitations (as in flascc with a very limited opengl support).
But would be interesting to get glew working at least without breaking the build and providing basic ogles functionalities (glGenBuffers, etc.).

[Nigel Stewart]

Two thing on this:

There is an es branch that is now somewhat stale, but was reportedly working for ES. It's a bit of shame that it didn't get merged at the time, but there is some chance that it is useful in it's current form.

I did some recent work to parse the ES extensions are reorganize the GLEW tree to have both desktop GL and ES along side. I have not taken this to the next step, but it would be interesting for someone to continue that work, perhaps bringing in some of the es branch stuff.

• Nigel

[Marcos Scriven]

Hi

I'm trying to compile OpenCSG with Emscripten, and this would be extremely useful.

It's not impossible without it - in the Emscripten tests you see this kind of thing a lot https://github.com/kripken/emscripten/blob/master/tests/cubegeom.c:

#if !EMSCRIPTEN
#define USE_GLEW 1
#endif

#if USE_GLEW
#include "GL/glew.h"
#endif

#include "SDL/SDL.h"
#if !USE_GLEW
#include "SDL/SDL_opengl.h"
#endif

But in OpenCSG there's lots of chunks all over the place like this (src/channelManager.cpp):

if (GLEW_ARB_texture_rectangle || GLEW_EXT_texture_rectangle || GLEW_NV_texture_rectangle)
            glDisable(GL_TEXTURE_RECTANGLE_ARB);

So not as easy a just dropping in SDL_opengl.h replacement, unfortunately.

Thanks

Marcos

[Nigel Stewart]

Regal does currently support both ES1 and ES2.
https://github.com/p3/regal

If I could turn this into a feature-request, I would.