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authorNicolai Hähnle <[email protected]>2016-06-01 13:17:29 +0200
committerNicolai Hähnle <[email protected]>2016-06-07 23:45:17 +0200
commitd3a584defec988faa09960adea90545399440827 (patch)
tree973e7efd0b1f1271fa9795961a7b9fc9c19768ac /src/gallium/auxiliary/tgsi/tgsi_scan.c
parentb7a0c0ec7f5626bbec4904e6754f27087120ec54 (diff)
tgsi/scan: add uses_derivatives (v2)
v2: - TG4 does not calculate derivatives (Ilia) - also handle SAMPLE* instructions (Roland) Cc: 12.0 <[email protected]> Reviewed-by: Marek Olšák <[email protected]> (v1) Reviewed-by: Brian Paul <[email protected]> (v1) Reviewed-by: Ilia Mirkin <[email protected]> Reviewed-by: Roland Scheidegger <[email protected]>
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_scan.c')
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi_scan.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 1baf031d73e..98d86fc37a6 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -68,6 +68,33 @@ is_texture_inst(unsigned opcode)
tgsi_get_opcode_info(opcode)->is_tex);
}
+
+/**
+ * Is the opcode an instruction which computes a derivative explicitly or
+ * implicitly?
+ */
+static bool
+computes_derivative(unsigned opcode)
+{
+ if (tgsi_get_opcode_info(opcode)->is_tex) {
+ return opcode != TGSI_OPCODE_TG4 &&
+ opcode != TGSI_OPCODE_TXD &&
+ opcode != TGSI_OPCODE_TXF &&
+ opcode != TGSI_OPCODE_TXL &&
+ opcode != TGSI_OPCODE_TXL2 &&
+ opcode != TGSI_OPCODE_TXQ &&
+ opcode != TGSI_OPCODE_TXQ_LZ &&
+ opcode != TGSI_OPCODE_TXQS;
+ }
+
+ return opcode == TGSI_OPCODE_DDX || opcode == TGSI_OPCODE_DDX_FINE ||
+ opcode == TGSI_OPCODE_DDY || opcode == TGSI_OPCODE_DDY_FINE ||
+ opcode == TGSI_OPCODE_SAMPLE ||
+ opcode == TGSI_OPCODE_SAMPLE_B ||
+ opcode == TGSI_OPCODE_SAMPLE_C;
+}
+
+
static void
scan_instruction(struct tgsi_shader_info *info,
const struct tgsi_full_instruction *fullinst,
@@ -263,6 +290,9 @@ scan_instruction(struct tgsi_shader_info *info,
if (is_mem_inst)
info->num_memory_instructions++;
+ if (computes_derivative(fullinst->Instruction.Opcode))
+ info->uses_derivatives = true;
+
info->num_instructions++;
}