Mesa (master): st/mesa: improve the guess_and_alloc_texture() heuristic
Brian Paul
brianp at kemper.freedesktop.org
Fri Oct 19 01:22:41 UTC 2012
Module: Mesa
Branch: master
Commit: 6551c4ea3cc21169696920c5f3d3fb0bb8d6e939
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=6551c4ea3cc21169696920c5f3d3fb0bb8d6e939
Author: Brian Paul <brianp at vmware.com>
Date: Thu Oct 18 18:00:50 2012 -0600
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.
---
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 &&
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