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st/mesa: don't allocate mipmapped texture for NEAREST_MIPMAP_LINEAR

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Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák 2019-08-02 19:11:53 -04:00
parent 5180a222c0
commit d1ad4fda31
1 changed files with 12 additions and 0 deletions
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12
src/mesa/state_tracker/st_cb_texture.c
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@ -523,6 +523,18 @@ allocate_full_mipmap(const struct st_texture_object *stObj,
/* not a mipmap minification filter */
return FALSE;
/* If the following sequence of GL calls is used:
* glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, ...
* glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
*
* we would needlessly allocate a mipmapped texture, because the initial
* MinFilter is GL_NEAREST_MIPMAP_LINEAR. Catch this case and don't
* allocate a mipmapped texture by default. This may cause texture
* reallocation later, but GL_NEAREST_MIPMAP_LINEAR is pretty rare.
*/
if (stObj->base.Sampler.MinFilter == GL_NEAREST_MIPMAP_LINEAR)
return FALSE;
if (stObj->base.Target == GL_TEXTURE_3D)
/* 3D textures are seldom mipmapped */
return FALSE;