Signed-off-by: Ilia Mirkin <imir...@alum.mit.edu>
---
src/gallium/auxiliary/tgsi/tgsi_strings.c | 1 +
src/gallium/docs/source/tgsi.rst | 8 ++++++++
src/gallium/include/pipe/p_shader_tokens.h | 3 ++-
src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 4 +++-
4 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c
b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index 8271ea0..ad2fc59 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -95,6 +95,7 @@ const char *tgsi_semantic_names[TGSI_SEMANTIC_COUNT] =
"TESSOUTER",
"TESSINNER",
"VERTICESIN",
+ "FRAG_HELPER",
};
const char *tgsi_texture_names[TGSI_TEXTURE_COUNT] =
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 314fe1b..8377fc0 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -2941,6 +2941,14 @@ TGSI_SEMANTIC_VERTICESIN
For tessellation evaluation/control shaders, this semantic label indicates the
number of vertices provided in the input patch. Only the X value is defined.
+TGSI_SEMANTIC_FRAG_HELPER
+"""""""""""""""""""""""""
+
+For fragment shaders, this semantic indicates whether the current
+invocation is covered or not. Helper invocations are created in order
+to properly compute derivatives, however it may be desirable to skip
+some of the logic in those cases. See ``gl_HelperInvocation`` documentation.
+
Declaration Interpolate
^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/gallium/include/pipe/p_shader_tokens.h
b/src/gallium/include/pipe/p_shader_tokens.h
index b36e0a3..c234e75 100644
--- a/src/gallium/include/pipe/p_shader_tokens.h
+++ b/src/gallium/include/pipe/p_shader_tokens.h
@@ -185,7 +185,8 @@ struct tgsi_declaration_interp
#define TGSI_SEMANTIC_TESSOUTER 32 /**< outer tessellation levels */
#define TGSI_SEMANTIC_TESSINNER 33 /**< inner tessellation levels */
#define TGSI_SEMANTIC_VERTICESIN 34 /**< number of input vertices */
-#define TGSI_SEMANTIC_COUNT 35 /**< number of semantic values */
+#define TGSI_SEMANTIC_FRAG_HELPER 35 /**< current invocation is helper */
+#define TGSI_SEMANTIC_COUNT 36 /**< number of semantic values */
struct tgsi_declaration_semantic
{
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index fc728d1..8b9cf86 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4614,7 +4614,7 @@ const unsigned _mesa_sysval_to_semantic[SYSTEM_VALUE_MAX]
= {
TGSI_SEMANTIC_SAMPLEID,
TGSI_SEMANTIC_SAMPLEPOS,
TGSI_SEMANTIC_SAMPLEMASK,
- 0, /* gl_HelperInvocation */
+ TGSI_SEMANTIC_FRAG_HELPER,
/* Tessellation shaders
*/
@@ -5381,6 +5381,8 @@ st_translate_program(
TGSI_SEMANTIC_BASEVERTEX);
assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_TESS_COORD] ==
TGSI_SEMANTIC_TESSCOORD);
+ assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_FRAG_HELPER] ==
+ TGSI_SEMANTIC_FRAG_HELPER);
t = CALLOC_STRUCT(st_translate);
if (!t) {
--
2.4.6
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
