From: Brian Paul <brianp@vmware.com>
Date: Thu, 30 Sep 2010 16:52:26 +0000 (-0600)
Subject: gallivm: check for level=0 case in lp_build_minify()
X-Git-Tag: 062012170305~9444^2~453
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=874f3a57ce5ae41ced103bf5a549a2eb663db6c5;p=profile%2Fivi%2Fmesa.git

gallivm: check for level=0 case in lp_build_minify()

This lets us avoid the shift and max() operations.
---

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;
+   }
 }