rusticl/program: accept and ignore Intel's 4G memory flags

Some applications are making use of it whenever they identify an Intel
device.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38720>

src/gallium/frontends/rusticl/api/memory.rs

@@ -14,6 +14,7 @@ use crate::core::format::*;
 use crate::core::gl::*;
 use crate::core::memory::*;
 use crate::core::queue::*;
+use crate::rusticl_warn_once;
 
 use mesa_rust_gen::pipe_fd_type;
 use mesa_rust_util::properties::Properties;
@@ -48,7 +49,8 @@ fn validate_mem_flags(flags: cl_mem_flags, validation: MemFlagValidationType) ->
             | CL_MEM_WRITE_ONLY
             | CL_MEM_READ_ONLY
             | CL_MEM_KERNEL_READ_AND_WRITE
-            | CL_MEM_IMMUTABLE_EXT,
+            | CL_MEM_IMMUTABLE_EXT
+            | CL_MEM_ALLOW_UNRESTRICTED_SIZE_INTEL,
     );
 
     if validation != MemFlagValidationType::Imported {
@@ -66,6 +68,12 @@ fn validate_mem_flags(flags: cl_mem_flags, validation: MemFlagValidationType) ->
         return Err(CL_INVALID_VALUE);
     }
 
+    if flags & cl_bitfield::from(CL_MEM_ALLOW_UNRESTRICTED_SIZE_INTEL) != 0 {
+        rusticl_warn_once!(
+            "Use of CL_MEM_ALLOW_UNRESTRICTED_SIZE_INTEL detected. This flag is ignored and applications shouldn't use them with rusticl."
+        );
+    }
+
     Ok(())
 }
 

src/gallium/frontends/rusticl/core/program.rs

@@ -309,6 +309,8 @@ fn prepare_options(options: &str, dev: &Device) -> Vec<CString> {
             "-cl-denorms-are-zero" => Some("-fdenormal-fp-math=positive-zero"),
             // We can ignore it as long as we don't support ifp
             "-cl-no-subgroup-ifp" => None,
+            // Some applications use this argument when they detect Intel hardware.
+            "-cl-intel-greater-than-4GB-buffer-required" => None,
             _ => Some(a),
         })
         .map(CString::new)

src/gallium/frontends/rusticl/meson.build

@@ -136,6 +136,8 @@ rusticl_opencl_bindings_rs = rust.bindgen(
     'rusticl_opencl_bindings.h',
     opencl_headers,
   ],
+  # required by 'CL_intel/cl_ext_private.h'
+  language : 'cpp',
   output : 'rusticl_opencl_bindings.rs',
   include_directories : [
     inc_include,

src/gallium/frontends/rusticl/rusticl_opencl_bindings.h

@@ -12,6 +12,9 @@
 #endif
 #include "GL/mesa_glinterop.h"
 
+/* We include custom vendor headers last */
+#include "CL_intel/cl_ext_private.h"
+
 #define DECL_CL_STRUCT(name) struct name { const cl_icd_dispatch *dispatch; }
 DECL_CL_STRUCT(_cl_command_queue);
 DECL_CL_STRUCT(_cl_context);