I have Go code that opens a Fyne window. I run this on my MacBook and it works. I am trying to get it to run on a KVM Windows server. This issue isn't related to this specific KVM server as I've tried this on multiple windows servers and faced the same issue. When I run my code and it tries to opens a Fyne window, I get a dialog with the error:
Fyne error: window creation error Cause:APIUnavailable: WGL: The driver does not appear to support OpenGL At: C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/in ternal/driver/glfw/driver.go:149
I saw this SO thread. The driver on my server is from "6/21/2006", has version "10.0.17763.1", and model basicdisplay.inf_amd64_5103ac179273be89\Basic Display.sys. So it seems expired since that SO thread mentions
OpenGL required is 13 years old
I tried updating windows but that didn't fix it. I also tried doing Update Driver option in Display Adapters Properties, this said driver up to date. My server provider said:
The server doesn’t have a GPU or display so naturally it doesn’t need a graphics driver. Virtual machines don't come with graphics drivers on them because they don't have GPUs. Hence why the driver is the most basic one from Windows
They also mentioned that it's not Virtual Box so there is no 3D acceleration option. My user base is mainly going to be running my app on windows servers. I don't want to have my users go through this hassle. This Github Thread mentions I can use a Mesa DLL to make this work. Is this Mesa DLL something I can just include in my download link for my users if their on windows so that they never encounter this error?
If so I tried downloading mesa3d-25.0.1-release-msvc.7z, then I extracted it and put all the DLL files in the root folder of my project. However this did not fix the issue with Fyne.
Update
runtime.cgocall(0x7ff60e2b8cd0, 0xc000e23000)
C:/Program Files/Go/src/runtime/cgocall.go:167 +0x3e fp=0xc000e22fd8 sp=0xc000e22f70 pc=0x7ff60d5c171e
github.com/go-gl/gl/v2.1/gl._Cfunc_glowTexImage2D(0x7ffb3b6dc220, 0xde1, 0x0, 0x1908, 0x48, 0x13, 0x0, 0x1908, 0x1401, 0xc000e7d000)
_cgo_gotypes.go:41396 +0x48 fp=0xc000e23000 sp=0xc000e22fd8 pc=0x7ff60e1829a8
fyne.io/fyne/v2/internal/painter/gl.(*coreContext).TexImage2D.TexImage2D.func1(...)
C:/Users/Administrator/go/pkg/mod/github.com/go-gl/gl@v0.0.0-20211210172815-726fda9656d6/v2.1/gl/package.go:26528
github.com/go-gl/gl/v2.1/gl.TexImage2D(...)
C:/Users/Administrator/go/pkg/mod/github.com/go-gl/gl@v0.0.0-20211210172815-726fda9656d6/v2.1/gl/package.go:26528
fyne.io/fyne/v2/internal/painter/gl.(*coreContext).TexImage2D(0x7ff60ece0340?, 0xde1, 0x0, 0x48, 0x13, 0x1908, 0x1401, {0xc000e7d000, 0x1560, 0x1560})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/gl_core.go:231 +0xe8 fp=0xc000e23050 sp=0xc000e23000 pc=0x7ff60e1b8b68
fyne.io/fyne/v2/internal/painter/gl.(*painter).imgToTexture(0xc000e80000, {0x7ff60efd4980?, 0xc000328880}, 0x0)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/texture.go:72 +0xea fp=0xc000e23100 sp=0xc000e23050 pc=0x7ff60e1ba0aa
fyne.io/fyne/v2/internal/painter/gl.(*painter).imgToTexture(0xc000e80000, {0x7ff60efd4920, 0xc00034fec0}, 0x0)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/texture.go:86 +0x2e8 fp=0xc000e231b0 sp=0xc000e23100 pc=0x7ff60e1ba2a8
fyne.io/fyne/v2/internal/painter/gl.(*painter).newGlTextTexture(0xc000e80000, {0x7ff60efdf6c0?, 0xc000322ab0})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/texture.go:153 +0x28f fp=0xc000e23278 sp=0xc000e231b0 pc=0x7ff60e1baa2f
fyne.io/fyne/v2/internal/painter/gl.(*painter).newGlTextTexture-fm({0x7ff60efdf6c0?, 0xc000322ab0?})
<autogenerated>:1 +0x33 fp=0xc000e232a0 sp=0xc000e23278 pc=0x7ff60e1baf33
fyne.io/fyne/v2/internal/painter/gl.(*painter).getTexture(0xc000e80000, {0x7ff60efdf6c0, 0xc000322ab0}, 0xc000e233c8)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/texture.go:39 +0x49 fp=0xc000e232e0 sp=0xc000e232a0 pc=0x7ff60e1b9f09
fyne.io/fyne/v2/internal/painter/gl.(*painter).drawTextureWithDetails(0xc000e80000, {0x7ff60efdf6c0, 0xc000322ab0}, 0xc000e51578?, {0xe23400?, 0xc0?}, {0xd89b1b2?, 0x7ff6?}, {0x5ad158?, 0xc0?}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/draw.go:249 +0x6d fp=0xc000e23368 sp=0xc000e232e0 pc=0x7ff60e1b620d
fyne.io/fyne/v2/internal/painter/gl.(*painter).drawText(0xc000e80000, 0xc000322ab0, {0x0?, 0x0?}, {0xe23470?, 0xc0?})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/draw.go:243 +0x1f6 fp=0xc000e233e8 sp=0xc000e23368 pc=0x7ff60e1b6136
fyne.io/fyne/v2/internal/painter/gl.(*painter).drawObject(0x7ff60d56739f?, {0x7ff60efdf6c0?, 0xc000322ab0?}, {0xd5c8a01?, 0x7ff6?}, {0x67db8bff?, 0x0?})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/draw.go:139 +0x105 fp=0xc000e23438 sp=0xc000e233e8 pc=0x7ff60e1b56e5
fyne.io/fyne/v2/internal/painter/gl.(*painter).Paint(0xc000e80000, {0x7ff60efdf6c0, 0xc000322ab0}, {0x1?, 0x0?}, {0xe234e8?, 0xc0?})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/painter/gl/painter.go:93 +0x70 fp=0xc000e23480 sp=0xc000e23438 pc=0x7ff60e1b9250
fyne.io/fyne/v2/internal/driver/glfw.(*glCanvas).paint.func1(0xc000e23528?, {0xd56739f?, 0x7ff6?})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/glfw/canvas.go:296 +0x128 fp=0xc000e234e8 sp=0xc000e23480 pc=0x7ff60e1d8388
fyne.io/fyne/v2/internal/driver/common.(*Canvas).walkTree.func1({0x7ff60efdf6c0, 0xc000322ab0}, {0xefdfa20?, 0x7ff6?}, {0x12b140?, 0xc0?}, {0xe62e40?, 0xc0?})
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/common/canvas.go:503 +0x222 fp=0xc000e23538 sp=0xc000e234e8 pc=0x7ff60e1bdc22
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf6c0, 0xc000322ab0}, 0x0, {0x7ff60efdfa20, 0xc00012b140}, {0xe23658?, 0xc0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:171 +0x24a fp=0xc000e235f8 sp=0xc000e23538 pc=0x7ff60e174baa
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdfa20, 0xc00012b140}, 0x0, {0x7ff60efdf420, 0xc00044aee0}, {0xe23718?, 0xc0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e236b8 sp=0xc000e235f8 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf420, 0xc00044aee0}, 0x0, {0x7ff60efdfc60, 0xc00030d730}, {0x400008?, 0xc0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e23778 sp=0xc000e236b8 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdfc60, 0xc00030d730}, 0x0, {0x7ff60efdf360, 0xc0008e80f0}, {0xe23898?, 0xc0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e23838 sp=0xc000e23778 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf360, 0xc0008e80f0}, 0x0, {0x7ff60efdf3c0, 0xc0008e8140}, {0xe23958?, 0xc0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e238f8 sp=0xc000e23838 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf3c0, 0xc0008e8140}, 0x0, {0x7ff60efdf480, 0xc00047c000}, {0xe23a18?, 0xc0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e239b8 sp=0xc000e238f8 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf480, 0xc00047c000}, 0x0, {0x7ff60efdf3c0, 0xc00047e000}, {0x0?, 0x0?}, {0x43960000?, 0x440b4000?}, {0x40800000?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e23a78 sp=0xc000e239b8 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf3c0, 0xc00047e000}, 0x0, {0x7ff60efdf360, 0xc0008e8000}, {0xf94ace0?, 0x7ff6?}, {0xeff61e0?, 0x7ff6?}, {0xe3a320?, ...}, ...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:192 +0x36c fp=0xc000e23b38 sp=0xc000e23a78 pc=0x7ff60e174ccc
fyne.io/fyne/v2/internal/driver.walkObjectTree.func1(...)
C:/Users/Administrator/go/pkg/mod/fyne.io/fyne/v2@v2.5.2/internal/driver/util.go:178
fyne.io/fyne/v2/internal/driver.walkObjectTree({0x7ff60efdf360, 0xc0008e8000}, 0x0, {0x0, 0x0}, {0x3?, 0x2?}, {0x0?, 0x0?}, {0x0?, ...}, ...)
First I had to build my code using go build. Only this way was the program able to recognize the Mesa DLL.
Second of all, only the opengl32.dll file was needed from the Mesa download. I put this next to the exe build. But when I run like this I got the error in the question.
To fix this I created a run.bat file and inserted the following code which worked.
@echo off
set GALLIUM_DRIVER=llvmpipe
Main.exe
pause