> On 2016 Nov 24, at 4:59, Tero Pulkkinen <[email protected]> wrote:
>
> webgl with emscripten seems to do something odd with GL_POINTS in windows.
> Linux/mac builds works ok, but windows browsers seem to give just black
> screen where I expect some white points. normal opengl build in win32 works
> ok, so it is something webgl related. The generated emscripten javascript
> code is able to show the GL_POINTS; but only in linux/mac build. Every
> browser in windows seem to have this problem, I've tried it with two versions
> of chrome, edge and firefox, but they all seem to give just black screen
> where GL_POINTS are expected. I've tried nvidia's gfx card, and intel card,
> but both drivers are giving the same problem.
>
> I know shaders have some issues with number of uniform variables in webgl,
> such that the limits are very small, like 15 uniform variables, before it
> hits black screen kind of problems, but I don't think this piece of code goes
> above that limit.
>
> Is there anyone who has got GL_POINTS working in windows webgl under
> emscripten?
Are you setting gl_PointSize in your shader(s)? This is required in OpenGL ES
and WebGL but not in OpenGL. If not then it is likely that the Linux/Mac
browsers you are using are using an OpenGL back-end and are failing to enforce
this requirement while those on Windows are using ANGLE or equivalent which are.
Regards
-Mark
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