rusticl/memory: fallback if allocating linear images fails

Signed-off-by: Karol Herbst <git@karolherbst.de>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25052>

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

@@ -375,13 +375,27 @@ impl Mem {
         };
 
         let texture = if parent.is_none() {
-            Some(context.create_texture(
+            let mut texture = context.create_texture(
                 &image_desc,
                 image_format,
                 host_ptr,
                 bit_check(flags, CL_MEM_COPY_HOST_PTR),
                 res_type,
-            )?)
+            );
+
+            // if we error allocating a Staging resource, just try with normal as
+            // `CL_MEM_ALLOC_HOST_PTR` is just a performance hint.
+            if res_type == ResourceType::Staging && texture.is_err() {
+                texture = context.create_texture(
+                    &image_desc,
+                    image_format,
+                    host_ptr,
+                    bit_check(flags, CL_MEM_COPY_HOST_PTR),
+                    ResourceType::Normal,
+                )
+            }
+
+            Some(texture?)
         } else {
             None
         };

src/gallium/frontends/rusticl/mesa/pipe/screen.rs

@@ -69,7 +69,7 @@ impl ComputeParam<Vec<u64>> for PipeScreen {
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, PartialEq, Eq)]
 pub enum ResourceType {
     Normal,
     Staging,