RenderWindow::draw not working on different thread?

[Flawe]

So I have my main thread set up to create the window and poll the event queue. I set the window to inactive on this thread, launch a second thread and do most of the logic and rendering there.

I use mostly ogl calls but I wanted to add some text rendering utilizing what is available in sfml. I quickly found out that text doesn't render. After investigating a bit, it seems any calls to RenderWindow::draw have no effect when they happen on this second thread. If I do them on the main thread where I created the window every works just fine.

Any ideas what I might be missing? I'm resetting the ogl states, everything else works just fine, no errors, or artifacts, no nothing.

Thanks!

EDIT: I just synced an built latest from the github repo, for what it's worth

[eXpl0it3r]

I set the window to inactive on this thread, launch a second thread and do most of the logic and rendering there.

Do you also set the second thread active?

[Laurent]

If you call setText not in the drawing thread, make sure to call glFlush() after it so that the drawing thread is aware of the new glyphs.

[Flawe]

Thanks for the quick reply guys...

It all happens on the drawing thread (which is set to active). I've tried adding the glFlush as well but no change. This seems to affect any calls to renderWindow::draw, shapes and text, etc.

[Flawe]

For what it's worth, I can confirm the internal RenderTarget::draw call is made with the vertex list, and the glDrawArray happens with no error.

[Laurent]

I'm afraid you'll have to provide a complete and minimal code that reproduces the error

[Flawe]

Ah, interesting, it's not the thread at all. I have some buffers stored in vram and some code that looks like this:

...
glDeleteBuffers(1, &vbo);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, numVerts * sizeof(sVertexData), NULL, GL_DYNAMIC_DRAW);
...
glDeleteBuffers(1, &ibo);
glGenBuffers(1, &ibo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, numIndices * sizeof(u32), NULL, GL_STATIC_DRAW);
...

if I remove/bypass this code the font rendering works just fine.

edit: to be more specific, it's just the vertex buffer causing the issue, the index array can be allocated just fine without breaking font rendering.

[Laurent]

You must call

glBindBuffer(GL_ARRAY_BUFFER, 0);

before drawingSFML stuff.

It should be inside RenderTarget::resetGLStates(), I'll add it soon.

[Flawe]

cool, thanks!