From: Brian Paul <[email protected]>
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.
---
src/mesa/state_tracker/st_cb_texture.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/src/mesa/state_tracker/st_cb_texture.c
b/src/mesa/state_tracker/st_cb_texture.c
index 5bf3dc6..218c8d1 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -375,6 +375,8 @@ guess_and_alloc_texture(struct st_context *st,
*/
if ((stObj->base.Sampler.MinFilter == GL_NEAREST ||
stObj->base.Sampler.MinFilter == GL_LINEAR ||
+ (stObj->base.BaseLevel == 0 &&
+ stObj->base.MaxLevel == 0) ||
stImage->base._BaseFormat == GL_DEPTH_COMPONENT ||
stImage->base._BaseFormat == GL_DEPTH_STENCIL_EXT) &&
!stObj->base.GenerateMipmap &&
--
1.7.4.1
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