Module: Mesa
Branch: master
Commit: 874f3a57ce5ae41ced103bf5a549a2eb663db6c5
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=874f3a57ce5ae41ced103bf5a549a2eb663db6c5
Author: Brian Paul <bri...@vmware.com>
Date: Thu Sep 30 10:52:26 2010 -0600
gallivm: check for level=0 case in lp_build_minify()
This lets us avoid the shift and max() operations.
---
src/gallium/auxiliary/gallivm/lp_bld_sample.c | 13 ++++++++++---
1 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample.c
b/src/gallium/auxiliary/gallivm/lp_bld_sample.c
index d9fbbbe..6e53bca 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_sample.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_sample.c
@@ -362,9 +362,16 @@ lp_build_minify(struct lp_build_sample_context *bld,
LLVMValueRef base_size,
LLVMValueRef level)
{
- LLVMValueRef size = LLVMBuildLShr(bld->builder, base_size, level, "minify");
- size = lp_build_max(&bld->int_coord_bld, size, bld->int_coord_bld.one);
- return size;
+ if (level == bld->int_coord_bld.zero) {
+ /* if we're using mipmap level zero, no minification is needed */
+ return base_size;
+ }
+ else {
+ LLVMValueRef size =
+ LLVMBuildLShr(bld->builder, base_size, level, "minify");
+ size = lp_build_max(&bld->int_coord_bld, size, bld->int_coord_bld.one);
+ return size;
+ }
}
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