glsl: keep track of ssbo variable being accessed, add access params

Currently any access params (coherent/volatile/restrict) are being lost
when lowering to the ssbo load/store intrinsics. Keep track of the
variable being used, and bake its access params in as the last arg of
the load/store intrinsics.

If the variable is accessed via an instance block, then 'variable'
points to the instance block variable and not the field inside the
instance block that we are accessing. In order to check access
parameters for the field itself we need to detect this case and keep
track of the corresponding field struct so we can extract the specific
field access information from there instead.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]> (v1)
v1 -> v2: add tracking of struct field
v2 -> v3: minor adjustments based on Iago's feedback
Reviewed-by: Iago Toral Quiroga <[email protected]>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/compiler/shader_enums.h b/src/compiler/shader_enums.h
index efc0b0d515e..d4326c55a9d 100644
--- a/src/compiler/shader_enums.h
+++ b/src/compiler/shader_enums.h
@@ -535,6 +535,16 @@ enum gl_frag_depth_layout
    FRAG_DEPTH_LAYOUT_UNCHANGED
 };
 
+/**
+ * \brief Buffer access qualifiers
+ */
+enum gl_buffer_access_qualifier
+{
+   ACCESS_COHERENT = 1,
+   ACCESS_RESTRICT = 2,
+   ACCESS_VOLATILE = 4,
+};
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif