.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/validation/validate_image.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download__gallery_validation_validate_image.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr__gallery_validation_validate_image.py:


Validate image
==============

Show an image displayed the correct way.

* The green dots should be at the corners that are darker/brighter.
* The green dots should be in the center of these pixels.
* The darker corner is in the bottom left.

This shows the same image for different interpolation methods, and is
repeated for different dtypes, which leads to different WGSL for the
sampling and uses different clim-corrections.

.. GENERATED FROM PYTHON SOURCE LINES 15-70



.. image-sg:: /_gallery/validation/images/sphx_glr_validate_image_001.webp
   :alt: validate image
   :srcset: /_gallery/validation/images/sphx_glr_validate_image_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    import numpy as np
    from rendercanvas.auto import RenderCanvas, loop
    import pygfx as gfx


    canvas = RenderCanvas()
    renderer = gfx.renderers.WgpuRenderer(canvas)
    scene = gfx.Scene()

    data = np.array(
        [
            [0, 1, 1, 1],
            [1, 1, 1, 1],
            [1, 1, 1, 1],
            [1, 1, 1, 2],
        ],
        np.uint8,
    )

    # Using different dtypes:
    #
    # float -> r32float, sampler
    # uint8 -> r8unorm, sampler
    # int16 -> r16sint, no sampler | later maybe r16snorm with sampler
    # uin32 -> r32uint, no sampler

    for dx, dtype in enumerate(["float32", "uint8", "int16", "uint32"]):
        typed_data = data.astype(dtype)

        for dy, interpolation in enumerate(["nearest", "linear", "cubic"]):
            image = gfx.Image(
                gfx.Geometry(grid=gfx.Texture(typed_data, dim=2)),
                gfx.ImageBasicMaterial(clim=(0, 2), interpolation=interpolation),
            )
            image.local.position = dx * 5, dy * 5, 0
            scene.add(image)

    # Points go on the first (float / nearest-neighbour interpolated) image
    points = gfx.Points(
        gfx.Geometry(positions=[[0, 0, 1], [3, 3, 1]]),
        gfx.PointsMaterial(color=(0, 1, 0, 1), size=20, aa=True),
    )
    scene.add(points)

    camera = gfx.OrthographicCamera()
    camera.show_rect(-1, 19, -1, 14)

    canvas.request_draw(lambda: renderer.render(scene, camera))


    if __name__ == "__main__":
        print(__doc__)
        loop.run()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.904 seconds)


.. _sphx_glr_download__gallery_validation_validate_image.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: validate_image.ipynb <validate_image.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: validate_image.py <validate_image.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: validate_image.zip <validate_image.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_