Anti-Aliasing in GPU shader Module(OpenGL)

Question

How to smooth the bound of the shape? If you run the following script in blender,
you can see the Jagged Edge in that shape.

import bpy, gpu, bgl
from gpu_extras.batch import batch_for_shader

vertices = [[150, 41.52], [150, 71.52], [56, 234.39],
    [30.0, 249.4], [270, 249.4], [244.02, 234.39]]
indices = ((0, 1, 2), (0, 2, 3), (2, 3, 4), (2, 4, 5), (0, 1, 4), (1, 5, 4))

shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
batch = batch_for_shader(shader, 'TRIS', {"pos": vertices}, indices=indices)

def draw():
    # bgl.glHint(bgl.GL_POLYGON_SMOOTH_HINT, bgl.GL_NICEST)
    # bgl.glEnable(bgl.GL_BLEND)
    # bgl.glEnable(bgl.GL_POLYGON_SMOOTH)

    shader.bind()
    shader.uniform_float("color", (0, 0.5, 0.5, 1.0))
    batch.draw(shader)

bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')

So, I try some code to smooth the bound.

bgl.glHint(bgl.GL_POLYGON_SMOOTH_HINT, bgl.GL_NICEST)
bgl.glEnable(bgl.GL_BLEND)
bgl.glEnable(bgl.GL_POLYGON_SMOOTH)

But it has some gap inside. I am no idea how to fix it.

Answer 1

As far as I know (and from looking at the docs), I don't see any smoothing options for gpu module. Also note that bgl is likely to be deprecated eventually.

I know you said you'd rather not, but as my answer, I'd suggest loading an image. Ideally there would be a way to tint the image within Blender (not sure if that's the case), but if not you can create multiple icons of different colors.