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authorIlia Mirkin <[email protected]>2015-09-14 16:23:04 -0400
committerIlia Mirkin <[email protected]>2015-11-12 17:58:23 -0500
commite3d9dbe3046c4fd10c6b4c66d8016e908ea7c140 (patch)
tree447ddd78a7f4d668f4b37d1198fc15620115e15f /src
parent20748318c5b870fc27f699637041e67a67321f5f (diff)
gallium: add support for gl_HelperInvocation semantic
Signed-off-by: Ilia Mirkin <[email protected]> Reviewed-by: Glenn Kennard <[email protected]>
Diffstat (limited to 'src')
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi_strings.c1
-rw-r--r--src/gallium/docs/source/tgsi.rst8
-rw-r--r--src/gallium/include/pipe/p_shader_tokens.h3
-rw-r--r--src/mesa/state_tracker/st_glsl_to_tgsi.cpp4
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 89369d60f4e..fc29a2398aa 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",
+ "HELPER_INVOCATION",
};
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 01e18f3084e..e7b0c2f6377 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_HELPER_INVOCATION
+"""""""""""""""""""""""""""""""
+
+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 e0ab9013dd5..a3137aec8db 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_HELPER_INVOCATION 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 b56512706b0..3ad1afdecda 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4408,7 +4408,7 @@ const unsigned _mesa_sysval_to_semantic[SYSTEM_VALUE_MAX] = {
TGSI_SEMANTIC_SAMPLEID,
TGSI_SEMANTIC_SAMPLEPOS,
TGSI_SEMANTIC_SAMPLEMASK,
- 0, /* gl_HelperInvocation */
+ TGSI_SEMANTIC_HELPER_INVOCATION,
/* Tessellation shaders
*/
@@ -5139,6 +5139,8 @@ 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_HELPER_INVOCATION] ==
+ TGSI_SEMANTIC_HELPER_INVOCATION);
t = CALLOC_STRUCT(st_translate);
if (!t) {