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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Warn about mipmap-incomplete texture being used"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=105901">105901</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Warn about mipmap-incomplete texture being used
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Mesa
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>17.2
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>mesa-dev@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>b7.10110111@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>mesa-dev@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Usage of textures with incomplete mipmap is a common OpenGL pitfall [1], since
by default GL_TEXTURE_MIN_FILTER is GL_NEAREST_MIPMAP_LINEAR. Thus it'd be very
useful if Mesa called debug callbacks on such errors.

A test case can be found in the attachment. When run, it first tries to draw a
full-screen textured quad with a mipmap-incomplete texture, and on a key press
it toggles TEXTURE_MIN_FILTER between NEAREST and NEAREST_MIPMAP_LINEAR.

Binary nvidia driver gives me a useful debug notification, leading to the
following output from the test program on each frame with mipmap-incomplete
texture use:

<span class="quote">> debug callback called, notification: Texture state usage warning: Texture 1 has no mipmaps, while its min filter requires mipmap.</span >

It would be very useful if Mesa also did this. Currently (as of 17.2) it
doesn't emit any relevant messages.

[1]:
<a href="https://www.opengl.org/archives/resources/features/KilgardTechniques/oglpitfall/">https://www.opengl.org/archives/resources/features/KilgardTechniques/oglpitfall/</a></pre>
        </div>
      </p>


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