diff options
| author | Zack Rusin <zackr@vmware.com> | 2013-08-15 13:10:22 -0400 |
|---|---|---|
| committer | Zack Rusin <zackr@vmware.com> | 2013-08-15 16:26:32 -0400 |
| commit | 7115bc3940c4c1952d503d9d56ebe6fd1fb11645 (patch) | |
| tree | 53e95c9973f39b3baaf476b968725617c11ce02d /src/gallium/auxiliary/gallivm | |
| parent | 035bf2198368d3fa69387788a63039d71319f0bf (diff) | |
draw: handle nan clipdistance
If clipdistance for one of the vertices is nan (or inf) then the
entire primitive should be discarded.
Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Diffstat (limited to 'src/gallium/auxiliary/gallivm')
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_arit.c | 26 | ||||
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_arit.h | 6 |
2 files changed, 32 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c index 98409c3be86..f7daabc639e 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c @@ -3671,3 +3671,29 @@ lp_build_isfinite(struct lp_build_context *bld, return lp_build_compare(bld->gallivm, int_type, PIPE_FUNC_NOTEQUAL, intx, infornan32); } + +/* + * Returns true if the number is nan or inf and false otherwise. + * The input has to be a floating point vector. + */ +LLVMValueRef +lp_build_is_inf_or_nan(struct gallivm_state *gallivm, + const struct lp_type type, + LLVMValueRef x) +{ + LLVMBuilderRef builder = gallivm->builder; + struct lp_type int_type = lp_int_type(type); + LLVMValueRef const0 = lp_build_const_int_vec(gallivm, int_type, + 0x7f800000); + LLVMValueRef ret; + + assert(type.floating); + + ret = LLVMBuildBitCast(builder, x, lp_build_vec_type(gallivm, int_type), ""); + ret = LLVMBuildAnd(builder, ret, const0, ""); + ret = lp_build_compare(gallivm, int_type, PIPE_FUNC_EQUAL, + ret, const0); + + return ret; +} + diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.h b/src/gallium/auxiliary/gallivm/lp_bld_arit.h index 35119d18f7b..d98025e42e3 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_arit.h +++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.h @@ -42,6 +42,7 @@ struct lp_type; struct lp_build_context; +struct gallivm_state; /** @@ -353,4 +354,9 @@ lp_build_isfinite(struct lp_build_context *bld, LLVMValueRef x); +LLVMValueRef +lp_build_is_inf_or_nan(struct gallivm_state *gallivm, + const struct lp_type type, + LLVMValueRef x); + #endif /* !LP_BLD_ARIT_H */ |