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-rw-r--r--src/panfrost/pandecode/decode.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/panfrost/pandecode/decode.c b/src/panfrost/pandecode/decode.c
index 8fc18b2ee74..208f4103c75 100644
--- a/src/panfrost/pandecode/decode.c
+++ b/src/panfrost/pandecode/decode.c
@@ -1387,6 +1387,38 @@ pandecode_attribute_meta(int job_no, int count, const struct mali_vertex_tiler_p
attr_meta = pandecode_fetch_gpu_mem(attr_mem, p,
sizeof(*attr_mem));
+ /* If the record is discard, it should be zero for everything else */
+
+ if (attr_meta->format == MALI_VARYING_DISCARD) {
+ uint64_t zero =
+ attr_meta->index |
+ attr_meta->unknown1 |
+ attr_meta->unknown3 |
+ attr_meta->src_offset;
+
+ if (zero)
+ pandecode_msg("XXX: expected empty record for varying discard\n");
+
+ /* We want to look for a literal 0000 swizzle -- this
+ * is not encoded with all zeroes, however */
+
+ enum mali_channel z = MALI_CHANNEL_ZERO;
+ unsigned zero_swizzle = z | (z << 3) | (z << 6) | (z << 9);
+ bool good_swizzle = attr_meta->swizzle == zero_swizzle;
+
+ if (!good_swizzle)
+ pandecode_msg("XXX: expected zero swizzle for discard\n");
+
+ if (!varying)
+ pandecode_msg("XXX: cannot discard attribute\n");
+
+ /* If we're all good, omit the record */
+ if (!zero && varying && good_swizzle) {
+ pandecode_log("/* discarded varying */\n");
+ continue;
+ }
+ }
+
pandecode_log("{\n");
pandecode_indent++;
pandecode_prop("index = %d", attr_meta->index);