Used internally in freedreno/ir3 for the vec2 value that hw passes to
shader to use as coordinate for bary.f (varying fetch) instruction.
This is not the same as SYSTEM_VALUE_FRAG_COORD.
Signed-off-by: Rob Clark <robdcl...@gmail.com>
---
Up until now, we'd been hard-coding the location of this value (ie. to
r0.xy), mostly because originally in the early a3xx days I didn't know
which bits could configure this value (blob was always using r0.xy so
in cmdstream traces it always showed up as 0's).
But starting with a6xx, the address register aliases r0.x, which kinda
throws a monkey-wrench in the existing scheme of hard-coding. The good
news is that I know the bits to configure this value for a3xx-a6xx.
So I'm shifting over to handling this like a sysval.
src/compiler/shader_enums.c | 1 +
src/compiler/shader_enums.h | 6 ++++++
src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 1 +
3 files changed, 8 insertions(+)
diff --git a/src/compiler/shader_enums.c b/src/compiler/shader_enums.c
index a874083a0b7..0210b503d3f 100644
--- a/src/compiler/shader_enums.c
+++ b/src/compiler/shader_enums.c
@@ -244,6 +244,7 @@ gl_system_value_name(gl_system_value sysval)
ENUM(SYSTEM_VALUE_DEVICE_INDEX),
ENUM(SYSTEM_VALUE_VIEW_INDEX),
ENUM(SYSTEM_VALUE_VERTEX_CNT),
+ ENUM(SYSTEM_VALUE_VARYING_COORD),
};
STATIC_ASSERT(ARRAY_SIZE(names) == SYSTEM_VALUE_MAX);
return NAME(sysval);
diff --git a/src/compiler/shader_enums.h b/src/compiler/shader_enums.h
index f8e22925f35..5c36f55283c 100644
--- a/src/compiler/shader_enums.h
+++ b/src/compiler/shader_enums.h
@@ -601,6 +601,12 @@ typedef enum
*/
SYSTEM_VALUE_VERTEX_CNT,
+ /**
+ * Driver internal varying-coord, used for varying-fetch instructions.
+ * Not externally visible.
+ */
+ SYSTEM_VALUE_VARYING_COORD,
+
SYSTEM_VALUE_MAX /**< Number of values */
} gl_system_value;
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index aec53309172..ec79a7f4918 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5601,6 +5601,7 @@ _mesa_sysval_to_semantic(unsigned sysval)
case SYSTEM_VALUE_LOCAL_INVOCATION_INDEX:
case SYSTEM_VALUE_GLOBAL_INVOCATION_ID:
case SYSTEM_VALUE_VERTEX_CNT:
+ case SYSTEM_VALUE_VARYING_COORD:
default:
assert(!"Unexpected SYSTEM_VALUE_ enum");
return TGSI_SEMANTIC_COUNT;
--
2.17.1
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