Implement :class:~.OpenGLImageMobject

[icedcoffeeee]

Overview: What does this pull request change?

This PR aims to bring compatibility for ImageMobject to the opengl renderer. In light of issues from 3b1b's version (some warping issue, further discussed in #1837 ), this approach uses the shaders from OpenGLTexturedSurface.

OpenGLImageMobjectTest.mp4

Numpy arrays as input

In making its cairo counterpart as equals, there exist efforts in making a numpy array as an acceptable input. Though, the output between cairo and this (opengl) is very clear, since the default sampling filter on cairo is 'bicubic' while moderngl only allows 'linear' and 'nearest' as well as some mipmap combination. Consequently, making a checkerboard pattern on an OpenGLSurface should be easy since all that's left is to automate the numpy array calculation to be passed to an OpenGLTexturedSurface (left for another PR).

Motivation and Explanation: Why and how do your changes improve the library?

Links to added or changed documentation pages

Further Information and Comments

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested

[Darylgolden]

I haven't reviewed the main part of the PR yet, but just some comments that jumped out at me.

[icedcoffeeee]

Update:

I managed to make moderngl textures to only take in PIL.Image.Image and let PIL handle the image processing such as resampling and image modes.

Code:

from manim import *
from manim.opengl import *
class Test(Scene):
    def construct(self):
        assets = Path("example_scenes", "assets")
        picture = assets / "1280px-Whole_world_-_land_and_oceans"
        a = OpenGLImageMobject(picture)
        b = OpenGLImageMobject(np.uint8([[0, 100, 30, 200], [255, 0, 5, 33]]))
        Group(a, b).arrange()
        self.add(a, b)

CLI: manim example.py Test -p --renderer=opengl

Output:

[behackl]

I've finally reviewed this: thank you very much, the code LGTM and I've also tested it successfully. I'll leave this open for just a little while longer in case anyone else wants to take another look.

[naveen521kk]

LGTM

requested changes have been carried out