From: Nicolai Hähnle <nicolai.haeh...@amd.com>
Cc: 12.0 <mesa-sta...@lists.freedesktop.org>
---
src/gallium/auxiliary/tgsi/tgsi_scan.c | 26 ++++++++++++++++++++++++++
src/gallium/auxiliary/tgsi/tgsi_scan.h | 1 +
2 files changed, 27 insertions(+)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c
b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 1baf031..d202ab1 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -68,6 +68,29 @@ 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_TXD &&
+ opcode != TGSI_OPCODE_TXL &&
+ opcode != TGSI_OPCODE_TXL2 &&
+ opcode != TGSI_OPCODE_TXF &&
+ 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;
+}
+
+
static void
scan_instruction(struct tgsi_shader_info *info,
const struct tgsi_full_instruction *fullinst,
@@ -263,6 +286,9 @@ 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++;
}
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h
b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index 31adce7..f7eefa4 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -115,6 +115,7 @@ struct tgsi_shader_info
boolean writes_memory; /**< contains stores or atomics to buffers or images
*/
boolean is_msaa_sampler[PIPE_MAX_SAMPLERS];
boolean uses_doubles; /**< uses any of the double instructions */
+ boolean uses_derivatives;
unsigned clipdist_writemask;
unsigned culldist_writemask;
unsigned num_written_culldistance;
--
2.7.4
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