OpenGL Minimum Version Handling

[peterdell]

Background
I could not get the emulator to work on my T530 Thinkpad. It just stopped with

jac@jac-ThinkPad-W530-2:~/jac/system/X65/Tools/EMU/emu/bin$ ./emu_linux_x64
[sapp][panic][id:36][line:11163]
ABORTING because of [panic]
Aborted (core dumped)

So I went and tried to debug it. My own compiled version resulted in:

sapp][panic][id:36] /home/jac/jac/system/Linux/Programming/Repositories/emu/ext/sokol/sokol_app.h:11163:0:
LINUX_GLX_CREATE_CONTEXT_FAILED: Failed to create GL context via glXCreateContextAttribsARB

ABORTING because of [panic]
Aborted (core dumped)

I could make it work by changing the code in "sokol_main", to use GL 3.0. And it worked all fine.

Here's my request:

1. Can you add more explicit error handling/messages for such an error?
2. If there is a minimum version requirement, the code should use the minimum version and not a later one, so it remains compatible with older machines.

[smokku]

I'm not sure how to reproduce this error.

I've tried removing libEGL.so.1 from my system, but it resulted in a simple:

bin/emu: error while loading shared libraries: libEGL.so.1: cannot open shared object file: No such file or directory

[peterdell]

I had to reduce the gL version to 2.^ in X65.c
sapp_desc sokol_main(int argc, char* argv[]) {
return (sapp_desc){
.init_cb = app_init,
.frame_cb = app_frame,
.event_cb = app_input,
.cleanup_cb = app_cleanup,
.width = window_width >= default_width ? window_width : default_width,
.height = window_height >= default_height ? window_height : default_height,
.window_title = app_name,
.icon.images = {
{
.width = app_icon.width,
.height = app_icon.height,
.pixels = (sapp_range){ &app_icon.pixel_data, app_icon.width * app_icon.height * 4 },
},
},
.enable_clipboard = true,
.enable_dragndrop = true,
.html5_bubble_mouse_events = true,
// .html5_bubble_wheel_events = true,
.html5_update_document_title = true,
.logger.func = slog_func,
// JAC!
.gl_major_version = 3,
.gl_minor_version = 0,
};

The error handling and defaulting for this is probably in the sokol project.