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gallium: add support for gl_HelperInvocation semantic 

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Glenn Kennard <glenn.kennard@gmail.com>
This commit is contained in:
Ilia Mirkin 2015-09-14 16:23:04 -04:00
parent 20748318c5
commit e3d9dbe304
4 changed files with 14 additions and 2 deletions
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1
src/gallium/auxiliary/tgsi/tgsi_strings.c
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@ -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] =

8
src/gallium/docs/source/tgsi.rst
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@ -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
^^^^^^^^^^^^^^^^^^^^^^^

3
src/gallium/include/pipe/p_shader_tokens.h
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@ -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
{

4
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
View File

@ -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) {