spirv: Handle the PixelCenterInteger execution mode.

This isn't allowed by Vulkan, but might be useful someday for
SPIR-V in OpenGL (if that ever becomes a thing).  It's easy enough
to hook up, and as precedent, we already do so for OriginLowerLeft.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
index e60bb54..359fa5c 100644 (file)
--- a/src/compiler/spirv/spirv_to_nir.c
+++ b/src/compiler/spirv/spirv_to_nir.c
@@ -2330,6 +2330,9 @@ vtn_handle_execution_mode(struct vtn_builder *b, struct vtn_value *entry_point,
       break;
 
    case SpvExecutionModePixelCenterInteger:
+      b->pixel_center_integer = true;
+      break;
+
    case SpvExecutionModeXfb:
       assert(!"Unhandled execution mode");
       break;

diff --git a/src/compiler/spirv/vtn_private.h b/src/compiler/spirv/vtn_private.h
index 3840d8c..3ecffad 100644 (file)
--- a/src/compiler/spirv/vtn_private.h
+++ b/src/compiler/spirv/vtn_private.h
@@ -378,6 +378,7 @@ struct vtn_builder {
    const char *entry_point_name;
    struct vtn_value *entry_point;
    bool origin_upper_left;
+   bool pixel_center_integer;
 
    struct vtn_function *func;
    struct exec_list functions;

diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index bbe1166..0c7f0f7 100644 (file)
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -1016,6 +1016,9 @@ var_decoration_cb(struct vtn_builder *b, struct vtn_value *val, int member,
 
       if (builtin == SpvBuiltInFragCoord || builtin == SpvBuiltInSamplePosition)
          nir_var->data.origin_upper_left = b->origin_upper_left;
+
+      if (builtin == SpvBuiltInFragCoord)
+         nir_var->data.pixel_center_integer = b->pixel_center_integer;
       break;
    }
    case SpvDecorationRowMajor: