diff --git a/arcade/gl/buffer.py b/arcade/gl/buffer.py
index 8918bd97d..2980d686e 100644
--- a/arcade/gl/buffer.py
+++ b/arcade/gl/buffer.py
@@ -66,7 +66,7 @@ def __init__(
         elif reserve > 0:
             self._size = reserve
             # populate the buffer with zero byte values
-            data = (gl.GLubyte * self._size)(0)
+            data = (gl.GLubyte * self._size)()
             gl.glBufferData(gl.GL_ARRAY_BUFFER, self._size, data, self._usage)
         else:
             raise ValueError("Buffer takes byte data or number of reserved bytes")
diff --git a/arcade/gl/compute_shader.py b/arcade/gl/compute_shader.py
index 6d1650a03..f52f74ca4 100644
--- a/arcade/gl/compute_shader.py
+++ b/arcade/gl/compute_shader.py
@@ -17,7 +17,7 @@ class ComputeShader:
     def __init__(self, ctx: "Context", glsl_source: str) -> None:
         self._ctx = ctx
         self._source = glsl_source
-        self._uniforms: Dict[str, Uniform] = dict()
+        self._uniforms: Dict[str, Union[UniformBlock, Uniform]] = dict()
 
         from arcade.gl import ShaderException
 
diff --git a/arcade/gl/context.py b/arcade/gl/context.py
index 25b197af2..01be837c7 100644
--- a/arcade/gl/context.py
+++ b/arcade/gl/context.py
@@ -7,6 +7,7 @@
                     Union)
 
 import pyglet
+import pyglet.gl.lib
 from pyglet import gl
 from pyglet.window import Window
 
@@ -17,7 +18,7 @@
 from .program import Program
 from .query import Query
 from .texture import Texture2D
-from .types import BufferDescription
+from .types import BufferDescription, GLenumLike, PyGLenum
 from .vertex_array import Geometry
 from ..types import BufferProtocol
 
@@ -872,9 +873,9 @@ def texture(
         components: int = 4,
         dtype: str = "f1",
         data: Optional[BufferProtocol] = None,
-        wrap_x: Optional[gl.GLenum] = None,
-        wrap_y: Optional[gl.GLenum] = None,
-        filter: Optional[Tuple[gl.GLenum, gl.GLenum]] = None,
+        wrap_x: Optional[PyGLenum] = None,
+        wrap_y: Optional[PyGLenum] = None,
+        filter: Optional[Tuple[GLenumLike, GLenumLike]] = None,
         samples: int = 0,
         immutable: bool = False,
     ) -> Texture2D:
@@ -1313,36 +1314,36 @@ def __init__(self, ctx):
 
             warn("Error happened while querying of limits. Moving on ..")
 
-    def get_int_tuple(self, enum: gl.GLenum, length: int):
+    def get_int_tuple(self, enum: GLenumLike, length: int):
         """Get an enum as an int tuple"""
         try:
             values = (c_int * length)()
             gl.glGetIntegerv(enum, values)
             return tuple(values)
-        except gl.lib.GLException:
+        except pyglet.gl.lib.GLException:
             return tuple([0] * length)
 
-    def get(self, enum: gl.GLenum, default=0) -> int:
+    def get(self, enum: GLenumLike, default=0) -> int:
         """Get an integer limit"""
         try:
             value = c_int()
             gl.glGetIntegerv(enum, value)
             return value.value
-        except gl.lib.GLException:
+        except pyglet.gl.lib.GLException:
             return default
 
-    def get_float(self, enum: gl.GLenum, default=0.0) -> float:
+    def get_float(self, enum: GLenumLike, default=0.0) -> float:
         """Get a float limit"""
         try:
             value = c_float()
             gl.glGetFloatv(enum, value)
             return value.value
-        except gl.lib.GLException:
+        except pyglet.gl.lib.GLException:
             return default
 
-    def get_str(self, enum: gl.GLenum) -> str:
+    def get_str(self, enum: GLenumLike) -> str:
         """Get a string limit"""
         try:
             return cast(gl.glGetString(enum), c_char_p).value.decode()  # type: ignore
-        except gl.lib.GLException:
+        except pyglet.gl.lib.GLException:
             return "Unknown"
diff --git a/arcade/gl/geometry.py b/arcade/gl/geometry.py
index 8b45e3b17..4356c5193 100644
--- a/arcade/gl/geometry.py
+++ b/arcade/gl/geometry.py
@@ -231,9 +231,9 @@ def sphere(
     R = 1.0 / (rings - 1)
     S = 1.0 / (sectors - 1)
 
-    vertices = [0] * (rings * sectors * 3)
-    normals = [0] * (rings * sectors * 3)
-    uvs = [0] * (rings * sectors * 2)
+    vertices = [0.0] * (rings * sectors * 3)
+    normals = [0.0] * (rings * sectors * 3)
+    uvs = [0.0] * (rings * sectors * 2)
 
     v, n, t = 0, 0, 0
     for r in range(rings):
diff --git a/arcade/gl/glsl.py b/arcade/gl/glsl.py
index 05569e9ca..81f2546e9 100644
--- a/arcade/gl/glsl.py
+++ b/arcade/gl/glsl.py
@@ -4,7 +4,7 @@
 from pyglet import gl
 
 from .exceptions import ShaderException
-from .types import SHADER_TYPE_NAMES
+from .types import SHADER_TYPE_NAMES, PyGLenum
 
 
 class ShaderSource:
@@ -31,7 +31,7 @@ def __init__(
         ctx: gl.Context,
         source: str,
         common: Optional[Iterable[str]],
-        source_type: gl.GLenum,
+        source_type: PyGLenum,
     ):
         """Create a shader source wrapper."""
         self._source = source.strip()
diff --git a/arcade/gl/program.py b/arcade/gl/program.py
index ecf6ada87..ac0de00b4 100644
--- a/arcade/gl/program.py
+++ b/arcade/gl/program.py
@@ -15,7 +15,7 @@
 from pyglet import gl
 
 from .uniform import Uniform, UniformBlock
-from .types import AttribFormat, GLTypes, SHADER_TYPE_NAMES
+from .types import AttribFormat, GLTypes, SHADER_TYPE_NAMES, PyGLenum
 from .exceptions import ShaderException
 
 if TYPE_CHECKING:  # handle import cycle caused by type hinting
@@ -93,7 +93,7 @@ def __init__(
                 f"Valid modes are: {self._valid_capture_modes}."
             )
 
-        shaders = [(vertex_shader, gl.GL_VERTEX_SHADER)]
+        shaders: List[Tuple[str, int]] = [(vertex_shader, gl.GL_VERTEX_SHADER)]
         if fragment_shader:
             shaders.append((fragment_shader, gl.GL_FRAGMENT_SHADER))
         if geometry_shader:
@@ -486,7 +486,7 @@ def _query_uniform_block(self, location: int) -> Tuple[int, int, str]:
         return index, b_size.value, u_name.value.decode()
 
     @staticmethod
-    def compile_shader(source: str, shader_type: gl.GLenum) -> gl.GLuint:
+    def compile_shader(source: str, shader_type: PyGLenum) -> gl.GLuint:
         """Compile the shader code of the given type.
 
         `shader_type` could be GL_VERTEX_SHADER, GL_FRAGMENT_SHADER, ...
diff --git a/arcade/gl/texture.py b/arcade/gl/texture.py
index 44474d8e4..685e8ca81 100644
--- a/arcade/gl/texture.py
+++ b/arcade/gl/texture.py
@@ -6,7 +6,7 @@
 
 from .buffer import Buffer
 from .utils import data_to_ctypes
-from .types import pixel_formats, BufferOrBufferProtocol
+from .types import PyGLuint, pixel_formats, BufferOrBufferProtocol
 from ..types import BufferProtocol
 
 if TYPE_CHECKING:  # handle import cycle caused by type hinting
@@ -115,8 +115,8 @@ def __init__(
         dtype: str = "f1",
         data: Optional[BufferProtocol] = None,
         filter: Optional[Tuple[gl.GLuint, gl.GLuint]] = None,
-        wrap_x: Optional[gl.GLuint] = None,
-        wrap_y: Optional[gl.GLuint] = None,
+        wrap_x: Optional[PyGLuint] = None,
+        wrap_y: Optional[PyGLuint] = None,
         target=gl.GL_TEXTURE_2D,
         depth=False,
         samples: int = 0,
diff --git a/arcade/gl/types.py b/arcade/gl/types.py
index 76bf0ce69..67e7e7190 100644
--- a/arcade/gl/types.py
+++ b/arcade/gl/types.py
@@ -1,5 +1,5 @@
 import re
-from typing import Optional, Iterable, List, Union
+from typing import Dict, Optional, Iterable, List, Sequence, Tuple, Union
 
 from pyglet import gl
 
@@ -9,6 +9,10 @@
 
 BufferOrBufferProtocol = Union[BufferProtocol, Buffer]
 
+GLenumLike = Union[gl.GLenum, int]
+PyGLenum = int
+GLuintLike = Union[gl.GLuint, int]
+PyGLuint = int
 
 _float_base_format = (0, gl.GL_RED, gl.GL_RG, gl.GL_RGB, gl.GL_RGBA)
 _int_base_format = (
@@ -102,8 +106,10 @@
 }
 
 
-def gl_name(gl_type: gl.GLenum) -> str:
+def gl_name(gl_type: Optional[PyGLenum]) -> Union[str, PyGLenum, None]:
     """Return the name of a gl type"""
+    if gl_type is None:
+        return None
     return GL_NAMES.get(gl_type, gl_type)
 
 
@@ -112,7 +118,7 @@ class AttribFormat:
     Represents an attribute in a BufferDescription or a Program.
 
     :param str name: Name of the attribute
-    :param gl.GLEnum gl_type: The OpenGL type such as GL_FLOAT, GL_HALF_FLOAT etc.
+    :param GLenumLike gl_type: The OpenGL type such as GL_FLOAT, GL_HALF_FLOAT etc.
     :param int bytes_per_component: Number of bytes a single component takes
     :param int offset: (Optional offset for BufferDescription)
     :param int location: (Optional location for program attribute)
@@ -128,9 +134,10 @@ class AttribFormat:
     )
 
     def __init__(
-        self, name: str, gl_type: gl.GLenum, components: int, bytes_per_component: int, offset=0, location=0
+        self, name: Optional[str], gl_type: Optional[PyGLenum], components: int, bytes_per_component: int, offset=0,
+        location=0
     ):
-        self.name: str = name
+        self.name = name
         self.gl_type = gl_type
         self.components = components
         self.bytes_per_component = bytes_per_component
@@ -188,7 +195,7 @@ class BufferDescription:
 
     # Describe all variants of a format string to simplify parsing (single component)
     # format: gl_type, byte_size
-    _formats = {
+    _formats: Dict[str, Tuple[Optional[PyGLenum], int]] = {
         # (gl enum, byte size)
         # Floats
         "f": (gl.GL_FLOAT, 4),
@@ -227,7 +234,7 @@ def __init__(
         self,
         buffer: Buffer,
         formats: str,
-        attributes: Iterable[str],
+        attributes: Sequence[str],
         normalized: Optional[Iterable[str]] = None,
         instanced: bool = False,
     ):
@@ -266,7 +273,7 @@ def __init__(
                 f"attributes ({len(self.attributes)})"
             )
 
-        def zip_attrs(formats, attributes):
+        def zip_attrs(formats: List[str], attributes: Sequence[str]):
             """Join together formats and attribute names taking padding into account"""
             attr_index = 0
             for f in formats:
@@ -344,7 +351,7 @@ class TypeInfo:
     """
     __slots__ = "name", "enum", "gl_type", "gl_size", "components"
 
-    def __init__(self, name: str, enum: gl.GLenum, gl_type: gl.GLenum, gl_size: int, components: int):
+    def __init__(self, name: str, enum: GLenumLike, gl_type: PyGLenum, gl_size: int, components: int):
         self.name = name
         self.enum = enum
         self.gl_type = gl_type
diff --git a/arcade/gl/uniform.py b/arcade/gl/uniform.py
index 5a3c3a9fe..778d5b0f1 100644
--- a/arcade/gl/uniform.py
+++ b/arcade/gl/uniform.py
@@ -114,8 +114,6 @@ def __init__(self, ctx, program_id, location, name, data_type, array_length):
         self._components = 0
         #: The getter function configured for this uniform
         #: The setter function configured for this uniform
-        self.getter = None
-        self.setter = None
         self._setup_getters_and_setters()
 
     @property
diff --git a/arcade/gl/vertex_array.py b/arcade/gl/vertex_array.py
index d4b45bac2..2c8ffb030 100644
--- a/arcade/gl/vertex_array.py
+++ b/arcade/gl/vertex_array.py
@@ -5,7 +5,7 @@
 from pyglet import gl
 
 from .buffer import Buffer
-from .types import BufferDescription, gl_name
+from .types import BufferDescription, GLenumLike, GLuintLike, gl_name
 from .program import Program
 
 if TYPE_CHECKING:  # handle import cycle caused by type hinting
@@ -146,7 +146,7 @@ def _build(
         # Build the vao according to the shader's attribute specifications
         for _, prog_attr in enumerate(program.attributes):
             # Do we actually have an attribute with this name in buffer descriptions?
-            if prog_attr.name.startswith("gl_"):
+            if prog_attr.name is not None and prog_attr.name.startswith("gl_"):
                 continue
             try:
                 buff_descr, attr_descr = descr_attribs[prog_attr.name]
@@ -239,7 +239,7 @@ def _build(
                 gl.glVertexAttribDivisor(prog_attr.location, 1)
 
     def render(
-        self, mode: gl.GLenum, first: int = 0, vertices: int = 0, instances: int = 1
+        self, mode: GLenumLike, first: int = 0, vertices: int = 0, instances: int = 1
     ):
         """Render the VertexArray to the currently active framebuffer.
 
@@ -259,7 +259,7 @@ def render(
         else:
             gl.glDrawArraysInstanced(mode, first, vertices, instances)
 
-    def render_indirect(self, buffer: Buffer, mode: gl.GLuint, count, first, stride):
+    def render_indirect(self, buffer: Buffer, mode: GLuintLike, count, first, stride):
         """
         Render the VertexArray to the framebuffer using indirect rendering.
 
@@ -300,8 +300,8 @@ def render_indirect(self, buffer: Buffer, mode: gl.GLuint, count, first, stride)
     def transform_interleaved(
         self,
         buffer: Buffer,
-        mode: gl.GLenum,
-        output_mode: gl.GLenum,
+        mode: GLenumLike,
+        output_mode: GLenumLike,
         first: int = 0,
         vertices: int = 0,
         instances: int = 1,
@@ -310,8 +310,8 @@ def transform_interleaved(
         """Run a transform feedback.
 
         :param Buffer buffer: The buffer to write the output
-        :param gl.GLenum mode: The input primitive mode
-        :param gl.GLenum output_mode: The output primitive mode
+        :param GLenumLike mode: The input primitive mode
+        :param GLenumLike output_mode: The output primitive mode
         :param int first: Offset start vertex
         :param int vertices: Number of vertices to render
         :param int instances: Number of instances to render
@@ -355,8 +355,8 @@ def transform_interleaved(
     def transform_separate(
         self,
         buffers: List[Buffer],
-        mode: gl.GLenum,
-        output_mode: gl.GLenum,
+        mode: GLenumLike,
+        output_mode: GLenumLike,
         first: int = 0,
         vertices: int = 0,
         instances: int = 1,
@@ -366,8 +366,8 @@ def transform_separate(
         Run a transform feedback writing to separate buffers.
 
         :param List[Buffer] buffers: The buffers to write the output
-        :param gl.GLenum mode: The input primitive mode
-        :param gl.GLenum output_mode: The output primitive mode
+        :param GLenumLike mode: The input primitive mode
+        :param GLenumLike output_mode: The output primitive mode
         :param int first: Offset start vertex
         :param int vertices: Number of vertices to render
         :param int instances: Number of instances to render
@@ -537,7 +537,7 @@ def render(
         self,
         program: Program,
         *,
-        mode: Optional[gl.GLenum] = None,
+        mode: Optional[GLenumLike] = None,
         first: int = 0,
         vertices: Optional[int] = None,
         instances: int = 1,
@@ -549,7 +549,7 @@ def render(
         or have resized the buffers after the geometry instance was created.
 
         :param Program program: The Program to render with
-        :param gl.GLenum mode: Override what primitive mode should be used
+        :param GLenumLike mode: Override what primitive mode should be used
         :param int first: Offset start vertex
         :param int vertices: Override the number of vertices to render
         :param int instances: Number of instances to render