st/mesa: improve the guess_and_alloc_texture() heuristic
If GL_BASE_LEVEL==0 and GL_MAX_LEVEL==0 that's a pretty good hint that there'll be a single mipmap level in the texture. Google Earth sets the texture's state this way before the first glTexImage call. This saves a bit of texture memory.
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@ -375,6 +375,8 @@ guess_and_alloc_texture(struct st_context *st,
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*/
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if ((stObj->base.Sampler.MinFilter == GL_NEAREST ||
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stObj->base.Sampler.MinFilter == GL_LINEAR ||
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(stObj->base.BaseLevel == 0 &&
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stObj->base.MaxLevel == 0) ||
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stImage->base._BaseFormat == GL_DEPTH_COMPONENT ||
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stImage->base._BaseFormat == GL_DEPTH_STENCIL_EXT) &&
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!stObj->base.GenerateMipmap &&
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