removed t_f field that was not used any longer

openwfs/devices/__init__.py

@@ -10,5 +10,8 @@
 except ImportError:
     pass  # ok, we don't have nidaqmx installed
 
-from . import slm
-from .slm import SLM
+try:
+    from . import slm
+    from .slm import SLM
+except ImportError:
+    pass  # ok, we don't have glfw or PyOpenGL installed

openwfs/devices/slm/__init__.py

@@ -1,3 +1,20 @@
+try:
+    import glfw
+    import OpenGL
+except ImportError:
+    raise ImportError(
+        """Could not initialize OpenGL because the glfw or PyOpenGL package is missing. 
+        To install, make sure to install the required packages:
+         ```pip install glfw```
+         ```pip install PyOpenGL```
+        Alternatively, specify the opengl extra when installing openwfs:
+         ```pip install openwfs[opengl]```
+         
+        Note that these installs will fail if no suitable OpenGL driver is found on the system. 
+        Please make sure you have the latest video drivers installed.
+        """
+    )
+
 from . import geometry
 from . import patch
 from . import shaders

pyproject.toml

@@ -23,7 +23,6 @@ build-backend = "poetry.core.masonry.api"
 python = ">=3.9,<4.0"
 numpy = ">=1.25.2"  # also allow numpy 2.x.y
 astropy = ">=5.1.0" # assuming the astropy.units is stable
-glfw = "^2.5.9"
 opencv-python = "^4.9.0.80"
 matplotlib = "^3.7.3"
 scipy = "^1.11.3"
@@ -32,11 +31,8 @@ annotated-types = "^0.7.0"
 # optional dependencies for hardware components
 nidaqmx = { version = "^1.0.1", optional = true }
 harvesters = { version = "^1.4.2", optional = true }
-
-[tool.poetry.group.opengl.dependencies]
-# also required, but can be omitted explicitly using the without option
-# this is used for read the docs, which has trouble with the OpenGL dependency
-PyOpenGL = "^3.1.7"
+PyOpenGL = { version = "^3.1.7", optional = true }
+glfw = { version = "^2.5.9", optional = true }
 
 [tool.poetry.extras]
 # optional dependencies for hardware components
@@ -45,6 +41,7 @@ PyOpenGL = "^3.1.7"
 # or poetry install --extras "nidaq" --extras "genicam"
 nidaq = ["nidaqmx"]
 genicam = ["harvesters"]
+opengl = ["PyOpenGL", "glfw"]
 
 [tool.black]
 line-length = 120