diff options
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c index 6780d3e53c4..337b6f73fd1 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c @@ -1445,6 +1445,8 @@ lp_build_sample_compare(struct lp_build_sample_context *bld, LLVMBuilderRef builder = bld->gallivm->builder; LLVMValueRef res, p; const unsigned chan = 0; + unsigned chan_type; + const struct util_format_description *format_desc; if (bld->static_sampler_state->compare_mode == PIPE_TEX_COMPARE_NONE) return; @@ -1466,11 +1468,22 @@ lp_build_sample_compare(struct lp_build_sample_context *bld, coord, tex); } - /* Clamp p coords to [0,1] */ - p = lp_build_clamp(&bld->coord_bld, p, - bld->coord_bld.zero, - bld->coord_bld.one); + /* Clamp p coords to [0,1] for fixed function depth texture format */ + format_desc = util_format_description(bld->static_texture_state->format); + /* not entirely sure we couldn't end up with non-valid swizzle here */ + chan_type = format_desc->swizzle[0] <= UTIL_FORMAT_SWIZZLE_W ? + format_desc->channel[format_desc->swizzle[0]].type : + UTIL_FORMAT_TYPE_FLOAT; + if (chan_type != UTIL_FORMAT_TYPE_FLOAT) { + p = lp_build_clamp(&bld->coord_bld, p, + bld->coord_bld.zero, bld->coord_bld.one); + } + /* + * technically this is not entirely correct for unorm depth as the ref value + * should be converted to the depth format (quantization!) and comparison + * then done in texture format. + */ /* result = (p FUNC texel) ? 1 : 0 */ res = lp_build_cmp(texel_bld, bld->static_sampler_state->compare_func, p, texel[chan]); |