Mesa (master): gallium: Add PIPE_CAP_COMPUTE_SHADER_DERIVATIVES

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Module: Mesa
Branch: master
Commit: f9b29c4a5862d7caeab89e8a3bd23f3275dbd9a6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f9b29c4a5862d7caeab89e8a3bd23f3275dbd9a6

Author: Caio Marcelo de Oliveira Filho <caio.oliveira at intel.com>
Date:   Thu Mar 28 01:47:10 2019 -0700

gallium: Add PIPE_CAP_COMPUTE_SHADER_DERIVATIVES

To enable NV_compute_shader_derivatives, which allows derivatives (and
texture lookups with implicit derivatives) in compute shaders.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/gallium/auxiliary/util/u_screen.c  | 3 +++
 src/gallium/docs/source/screen.rst     | 1 +
 src/gallium/include/pipe/p_defines.h   | 1 +
 src/mesa/state_tracker/st_extensions.c | 1 +
 4 files changed, 6 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_screen.c b/src/gallium/auxiliary/util/u_screen.c
index 9f0be8060ee..43310f3e879 100644
--- a/src/gallium/auxiliary/util/u_screen.c
+++ b/src/gallium/auxiliary/util/u_screen.c
@@ -348,6 +348,9 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
    case PIPE_CAP_COMPUTE_GRID_INFO_LAST_BLOCK:
       return 0;
 
+   case PIPE_CAP_COMPUTE_SHADER_DERIVATIVES:
+      return 0;
+
    default:
       unreachable("bad PIPE_CAP_*");
    }
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index a4d6a9557c0..7d3b262d240 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -503,6 +503,7 @@ The integer capabilities:
   cases may be a smaller number.
 * ``PIPE_CAP_COMPUTE_GRID_INFO_LAST_BLOCK``: Whether pipe_grid_info::last_block
   is implemented by the driver. See struct pipe_grid_info for more details.
+* ``PIPE_CAP_COMPUTE_SHADER_DERIVATIVE``: True if the driver supports derivatives (and texture lookups with implicit derivatives) in compute shaders.
 
 .. _pipe_capf:
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 3dbdea035e4..695bb2b3f18 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -865,6 +865,7 @@ enum pipe_cap
    PIPE_CAP_NIR_COMPACT_ARRAYS,
    PIPE_CAP_MAX_VARYINGS,
    PIPE_CAP_COMPUTE_GRID_INFO_LAST_BLOCK,
+   PIPE_CAP_COMPUTE_SHADER_DERIVATIVES,
 };
 
 /**
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 405fc21b3ad..7c0d1a72dc7 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -772,6 +772,7 @@ void st_init_extensions(struct pipe_screen *screen,
       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
       { o(MESA_tile_raster_order),           PIPE_CAP_TILE_RASTER_ORDER                },
+      { o(NV_compute_shader_derivatives),    PIPE_CAP_COMPUTE_SHADER_DERIVATIVES       },
       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
       { o(NV_fill_rectangle),                PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE      },
       { o(NV_primitive_restart),             PIPE_CAP_PRIMITIVE_RESTART                },