[Mesa-dev] [PATCH] Add NV_fragment_shader_interlock support.

[kevin.rogovin at intel.com]

From: Kevin Rogovin <kevin.rogovin at gmail.com>

The main purpose for having NV_fragment_shader_interlock
extension is because that extension is also for GLES31 while
the ARB extension is for GL only.
---
 src/compiler/glsl/builtin_functions.cpp  | 18 ++++++++++++++++++
 src/compiler/glsl/glsl_parser.yy         |  6 ++++--
 src/compiler/glsl/glsl_parser_extras.cpp |  1 +
 src/compiler/glsl/glsl_parser_extras.h   |  2 ++
 src/mesa/main/extensions_table.h         |  1 +
 5 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/compiler/glsl/builtin_functions.cpp b/src/compiler/glsl/builtin_functions.cpp
index 7119903795..e7b78c0158 100644
--- a/src/compiler/glsl/builtin_functions.cpp
+++ b/src/compiler/glsl/builtin_functions.cpp
@@ -519,6 +519,12 @@ supports_arb_fragment_shader_interlock(const _mesa_glsl_parse_state *state)
    return state->ARB_fragment_shader_interlock_enable;
 }
 
+static bool
+supports_nv_fragment_shader_interlock(const _mesa_glsl_parse_state *state)
+{
+   return state->NV_fragment_shader_interlock_enable;
+}
+
 static bool
 shader_clock(const _mesa_glsl_parse_state *state)
 {
@@ -3331,6 +3337,18 @@ builtin_builder::create_builtins()
                    supports_arb_fragment_shader_interlock),
                 NULL);
 
+   add_function("beginInvocationInterlockNV",
+                _invocation_interlock(
+                   "__intrinsic_begin_invocation_interlock",
+                   supports_nv_fragment_shader_interlock),
+                NULL);
+
+   add_function("endInvocationInterlockNV",
+                _invocation_interlock(
+                   "__intrinsic_end_invocation_interlock",
+                   supports_nv_fragment_shader_interlock),
+                NULL);
+
    add_function("anyInvocationARB",
                 _vote("__intrinsic_vote_any", vote),
                 NULL);
diff --git a/src/compiler/glsl/glsl_parser.yy b/src/compiler/glsl/glsl_parser.yy
index cb7376995d..bc2571b684 100644
--- a/src/compiler/glsl/glsl_parser.yy
+++ b/src/compiler/glsl/glsl_parser.yy
@@ -1450,10 +1450,12 @@ layout_qualifier_id:
                           "only valid in fragment shader input layout declaration.");
       } else if (pixel_interlock_ordered + pixel_interlock_unordered +
                  sample_interlock_ordered + sample_interlock_unordered > 0 &&
-                 !state->ARB_fragment_shader_interlock_enable) {
+                 !state->ARB_fragment_shader_interlock_enable &&
+                 !state->NV_fragment_shader_interlock_enable) {
          _mesa_glsl_error(& @1, state,
                           "interlock layout qualifier present, but the "
-                          "GL_ARB_fragment_shader_interlock extension is not "
+                          "GL_ARB_fragment_shader_interlock or "
+                          "GL_NV_fragment_shader_interlock extension is not "
                           "enabled.");
       } else {
          $$.flags.q.pixel_interlock_ordered = pixel_interlock_ordered;
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 6d92f24ea2..393942b62c 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -724,6 +724,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT_AEP(EXT_texture_cube_map_array),
    EXT(INTEL_conservative_rasterization),
    EXT(MESA_shader_integer_functions),
+   EXT(NV_fragment_shader_interlock),
    EXT(NV_image_formats),
 };
 
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 59a173418b..3b17b54f0a 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -810,6 +810,8 @@ struct _mesa_glsl_parse_state {
    bool INTEL_conservative_rasterization_warn;
    bool MESA_shader_integer_functions_enable;
    bool MESA_shader_integer_functions_warn;
+   bool NV_fragment_shader_interlock_enable;
+   bool NV_fragment_shader_interlock_warn;
    bool NV_image_formats_enable;
    bool NV_image_formats_warn;
    /*@}*/
diff --git a/src/mesa/main/extensions_table.h b/src/mesa/main/extensions_table.h
index af5ce118da..746e821886 100644
--- a/src/mesa/main/extensions_table.h
+++ b/src/mesa/main/extensions_table.h
@@ -346,6 +346,7 @@ EXT(NV_draw_buffers                         , dummy_true
 EXT(NV_fbo_color_attachments                , dummy_true                             ,  x ,  x ,  x , ES2, 2010)
 EXT(NV_fill_rectangle                       , NV_fill_rectangle                      , GLL, GLC,  x ,  x , 2015)
 EXT(NV_fog_distance                         , NV_fog_distance                        , GLL,  x ,  x ,  x , 2001)
+EXT(NV_fragment_shader_interlock            , ARB_fragment_shader_interlock          , GLL, GLC,  x ,  31, 2015)
 EXT(NV_image_formats                        , ARB_shader_image_load_store            ,  x ,  x ,  x ,  31, 2014)
 EXT(NV_light_max_exponent                   , dummy_true                             , GLL,  x ,  x ,  x , 1999)
 EXT(NV_packed_depth_stencil                 , dummy_true                             , GLL, GLC,  x ,  x , 2000)
-- 
2.17.1