Hello,
I've been stuck on this bug for a little while now, and I'm not sure it's
directly related to fluidsynth but I'm hoping someone can shed some light
even if it's a basic C++ issue.
For context, I have a 2d game map you can move around, The effects of the
bug I'm seeing are that the screen goes almost entirely black where it
should be rendering stuff, except for the very top of the screen which
shows what should be at the bottom of the screen, as if the camera has
moved almost all the way down. I've checked and I believe the camera/map
rendering is acting correctly.
This happens only when calling certain SDL functions from the sequencer
callback, at the very least I've found it happens with SDL_DestroyTexture
and SDL_CreateTextureFromSurface.
I have a Synth class that has a static seq_callback member. After playing
something through the sequencer I need to trigger some effects, like
showing a dialog. I have a reference to the Dialog class set on the Synth
class as a static variable (since the static seq_callback needs to access
it), and the dialog does stuff that ends up calling those SDL functions to
display text.
Example:
class Dialog {
showDialog() {
// update label with text
// this calls SDL_DestroyTexture / SDL_CreateTextureFromSurface
}
}
class Synth {
static Dialog* dialog;
static void seq_callback(...);
}
void Synth::seq_callback(...) {
dialog->showDialog("Text!"); // this succeeds, but creates the black
screen bug
}
I've tried triggering the dialog from other static functions in the same
class and it seems to work fine, the only way I've been able to reproduce
is by triggering calls to those SDL functions from the sequencer callback.
I am using:
OSX mojave
fluidsynth 1.11.1 (using brew, haven't been able to upgrade)
SDL 2.0.8 (also brew)
I think this actually used to work fine and am wondering if it's due to the
mojave upgrade (which introduced a different kind of black screen bug), but
it still seems strange that it only happens when triggered from the
callback.
Any help would be greatly appreciated.
Thanks,
Paul
---
Paul Cohn
psc...@gmail.com
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