gallium: Add PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL

This adds an option to treat gl_PointCoord as a system value.

Signed-off-by: Andreas Baierl <[email protected]>
Reviewed-by: Qiang Yu <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

4 files changed, 6 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_screen.c b/src/gallium/auxiliary/util/u_screen.c
index 2736deb2c6a..810ba8d1751 100644
--- a/src/gallium/auxiliary/util/u_screen.c
+++ b/src/gallium/auxiliary/util/u_screen.c
@@ -227,6 +227,7 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
    case PIPE_CAP_MULTI_DRAW_INDIRECT:
    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
+   case PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL:
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
       return 0;
 
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index b993087ac3c..ba7a9d440d4 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -303,6 +303,8 @@ The integer capabilities:
   TGSI opcodes are supported.
 * ``PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL``: If state trackers should use
   a system value for the POSITION fragment shader input.
+* ``PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL``: If state trackers should use
+  a system value for the POINT fragment shader input.
 * ``PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL``: If state trackers should use
   a system value for the FACE fragment shader input.
   Also, the FACE system value is integer, not float.
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index d6e33ce9daa..0271a08f690 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -798,6 +798,7 @@ enum pipe_cap
    PIPE_CAP_MULTI_DRAW_INDIRECT,
    PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS,
    PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL,
+   PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL,
    PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL,
    PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT,
    PIPE_CAP_INVALIDATE_BUFFER,
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 3b771081592..867ec49eb1c 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -444,6 +444,8 @@ void st_init_limits(struct pipe_screen *screen,
 
    c->GLSLFragCoordIsSysVal =
       screen->get_param(screen, PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL);
+   c->GLSLPointCoordIsSysVal =
+      screen->get_param(screen, PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL);
    c->GLSLFrontFacingIsSysVal =
       screen->get_param(screen, PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL);