Wow... How did I not notice IWindow exposes a GL context? <:cat_facepalm:759429636538105906>

L

Lyris the Kitori•4/8/23, 2:08 AM

we all miss things

MMachinarius Wow... How did I not notice IWindow exposes a GL context? <:cat_facepalm:7594296...

C

chairclr•4/8/23, 2:08 AM

thats how they get you

M

MachinariusOP•4/8/23, 2:11 AM

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        throw new InvalidOperationException("Could not get a proc address for " + name);
      }
      return procAddress;
    });
    if (grGlInterface == null) {
      throw new InvalidOperationException("Could not create a GLFW GRGL context");
    }

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        throw new InvalidOperationException("Could not get a proc address for " + name);
      }
      return procAddress;
    });
    if (grGlInterface == null) {
      throw new InvalidOperationException("Could not create a GLFW GRGL context");
    }

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        throw new InvalidOperationException("Could not get a proc address for " + name);
      }
      return procAddress;
    });
    if (grGlInterface == null) {
      throw new InvalidOperationException("Could not create a GLFW GRGL context");
    }

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        throw new InvalidOperationException("Could not get a proc address for " + name);
      }
      return procAddress;
    });
    if (grGlInterface == null) {
      throw new InvalidOperationException("Could not create a GLFW GRGL context");
    }

Still won't work

L

Lyris the Kitori•4/8/23, 2:11 AM

dont throw an exception

L

Lyris the Kitori•4/8/23, 2:11 AM

return nullptr

M

MachinariusOP•4/8/23, 2:12 AM

I hit the

return procAddress

return procAddress

return procAddress

return procAddress break-point multiple times, but the app crashes before I hit the

if

if

statement

L

Lyris the Kitori•4/8/23, 2:12 AM

crashing with what

L

Lyris the Kitori•4/8/23, 2:12 AM

how is it crashing

M

MachinariusOP•4/8/23, 2:14 AM

http://pastie.org/p/4u2lI1riz2GVdqyo73WI0X

M

MachinariusOP•4/8/23, 2:14 AM

Last few lines of the log

L

Lyris the Kitori•4/8/23, 2:14 AM

exited with code 0 means it exited cleanly

L

Lyris the Kitori•4/8/23, 2:14 AM

is an exception being thrown?

M

MachinariusOP•4/8/23, 2:15 AM

But it doesn't hit the breakpoint on the

if

if

right after the

Create

Create

call

- And it should crash because I have a NIE exception right after that anyways

M

MachinariusOP•4/8/23, 2:19 AM

2
Returning address 140000246277600 for proc glGetString
Returning address 140000246277632 for proc glGetStringi
Returning address 140000246271008 for proc glGetIntegerv
Returning address 140000246345920 for proc eglQueryString
Returning address 140000246345952 for proc eglGetCurrentDisplay

2
Returning address 140000246277600 for proc glGetString
Returning address 140000246277632 for proc glGetStringi
Returning address 140000246271008 for proc glGetIntegerv
Returning address 140000246345920 for proc eglQueryString
Returning address 140000246345952 for proc eglGetCurrentDisplay

2
Returning address 140000246277600 for proc glGetString
Returning address 140000246277632 for proc glGetStringi
Returning address 140000246271008 for proc glGetIntegerv
Returning address 140000246345920 for proc eglQueryString
Returning address 140000246345952 for proc eglGetCurrentDisplay

2
Returning address 140000246277600 for proc glGetString
Returning address 140000246277632 for proc glGetStringi
Returning address 140000246271008 for proc glGetIntegerv
Returning address 140000246345920 for proc eglQueryString
Returning address 140000246345952 for proc eglGetCurrentDisplay

Added a few more logs, but nothing conclusive. It seems all GL run-time look-ups skiaSharp is trying to do work, though it looks-up

glGetString

glGetString

glGetString

glGetString twice for some reason

M

MachinariusOP•4/8/23, 2:20 AM

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        procAddress = IntPtr.Zero;
      }
      Console.WriteLine($"Returning address {procAddress} for proc {name}");
      return procAddress;
    });

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        procAddress = IntPtr.Zero;
      }
      Console.WriteLine($"Returning address {procAddress} for proc {name}");
      return procAddress;
    });

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        procAddress = IntPtr.Zero;
      }
      Console.WriteLine($"Returning address {procAddress} for proc {name}");
      return procAddress;
    });

var grGlInterface = GRGlInterface.Create((name) => {
      if (!window.GLContext.TryGetProcAddress(name, out var procAddress)) {
        procAddress = IntPtr.Zero;
      }
      Console.WriteLine($"Returning address {procAddress} for proc {name}");
      return procAddress;
    });

Won't throw exceptions any more, but still won't work

L

Lyris the Kitori•4/8/23, 2:21 AM

given it seems to be exiting cleanly idk

M

MachinariusOP•4/8/23, 2:21 AM

Could it be that somehow the native code is asking for a clean termination somewhere?

L

Lyris the Kitori•4/8/23, 2:21 AM

maybe

M

MachinariusOP•4/8/23, 2:21 AM

Sneaky

exit(0)

exit(0)

exit(0)

exit(0) somewhere

M

MachinariusOP•4/8/23, 2:22 AM

I'll bite the bullet and

strace

strace

this

M

MachinariusOP•4/8/23, 2:25 AM

Apparently the (0) exit code is a red-herring from the VSCode debugger.

┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> dotnet run
Returning address 139470428931552 for proc glGetString
Returning address 139470428931552 for proc glGetString
Returning address 139470428931584 for proc glGetStringi
Returning address 139470428924960 for proc glGetIntegerv
Returning address 139470428999872 for proc eglQueryString
Returning address 139470428999904 for proc eglGetCurrentDisplay
┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> echo $?
139

┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> dotnet run
Returning address 139470428931552 for proc glGetString
Returning address 139470428931552 for proc glGetString
Returning address 139470428931584 for proc glGetStringi
Returning address 139470428924960 for proc glGetIntegerv
Returning address 139470428999872 for proc eglQueryString
Returning address 139470428999904 for proc eglGetCurrentDisplay
┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> echo $?
139

┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> dotnet run
Returning address 139470428931552 for proc glGetString
Returning address 139470428931552 for proc glGetString
Returning address 139470428931584 for proc glGetStringi
Returning address 139470428924960 for proc glGetIntegerv
Returning address 139470428999872 for proc eglQueryString
Returning address 139470428999904 for proc eglGetCurrentDisplay
┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> echo $?
139

┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> dotnet run
Returning address 139470428931552 for proc glGetString
Returning address 139470428931552 for proc glGetString
Returning address 139470428931584 for proc glGetStringi
Returning address 139470428924960 for proc glGetIntegerv
Returning address 139470428999872 for proc eglQueryString
Returning address 139470428999904 for proc eglGetCurrentDisplay
┏[machinarius][broken_silkdotnet] ≡  ?1 ~1
┖[~/Projects/DoomThing]> echo $?
139

M

MachinariusOP•4/8/23, 2:26 AM

The true exit code is 139

M

MachinariusOP•4/8/23, 2:27 AM

139 - Segmentation error. Could it be we're feeding Skia invalid proc addresses that don't belong to us?

M

MachinariusOP•4/8/23, 2:43 AM

I am guessing I'll just have to bite the bullet and learn 2d OpenGL, I give up lol

M

MachinariusOP•4/8/23, 3:08 AM

This makes very little sense to me. The proc addresses returned to Skia are indeed mapped into the memory that belongs to my process!