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

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This lets us avoid the shift and max() operations.
This commit is contained in:
Brian Paul 2010-09-30 10:52:26 -06:00
parent 4e6f5e8d43
commit 874f3a57ce
1 changed files with 10 additions and 3 deletions
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13
src/gallium/auxiliary/gallivm/lp_bld_sample.c
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@ -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;
}
}