rtx-cfd legacy GPU: the kernel-writing methods take &mut self; read-only ones keep a shared borrow

crates/specialized/rtx-cfd/src/solvers/lbm/d2q9_gpu.rs

@@ -253,7 +253,7 @@ impl D2Q9GpuSolver {
     }
 
     /// GPU-accelerated collision step
-    fn gpu_collision_step(&self) -> CfdResult<()> {
+    fn gpu_collision_step(&mut self) -> CfdResult<()> {
         let buffers = self
             .gpu_buffers
             .as_mut()
@@ -300,7 +300,7 @@ impl D2Q9GpuSolver {
     }
 
     /// GPU-accelerated streaming step
-    pub fn gpu_streaming_step(&self) -> CfdResult<()> {
+    pub fn gpu_streaming_step(&mut self) -> CfdResult<()> {
         let buffers = self
             .gpu_buffers
             .as_mut()
@@ -344,7 +344,7 @@ impl D2Q9GpuSolver {
     }
 
     /// GPU-accelerated macroscopic variable computation
-    fn gpu_compute_macroscopic(&self) -> CfdResult<()> {
+    fn gpu_compute_macroscopic(&mut self) -> CfdResult<()> {
         let buffers = self
             .gpu_buffers
             .as_mut()
@@ -391,7 +391,7 @@ impl D2Q9GpuSolver {
     }
 
     /// Compute equilibrium distributions on GPU
-    fn gpu_compute_equilibrium(&self) -> CfdResult<()> {
+    fn gpu_compute_equilibrium(&mut self) -> CfdResult<()> {
         let buffers = self
             .gpu_buffers
             .as_mut()
@@ -435,7 +435,7 @@ impl D2Q9GpuSolver {
     }
 
     /// GPU-accelerated bounce-back boundary conditions
-    pub fn gpu_apply_bounce_back_boundaries(&self) -> CfdResult<()> {
+    pub fn gpu_apply_bounce_back_boundaries(&mut self) -> CfdResult<()> {
         let buffers = self
             .gpu_buffers
             .as_mut()
@@ -539,7 +539,7 @@ impl D2Q9GpuSolver {
     pub fn get_macroscopic_at(&self, i: usize, j: usize) -> CfdResult<(f64, Vector2<f64>)> {
         let buffers = self
             .gpu_buffers
-            .as_mut()
+            .as_ref()
             .ok_or_else(|| CfdError::gpu_error("GPU buffers not initialized"))?;
 
         let idx = j * buffers.nx + i;
@@ -585,7 +585,7 @@ impl D2Q9GpuSolver {
     pub fn update_flow_field(&self, flow_field: &mut FlowField) -> CfdResult<()> {
         let buffers = self
             .gpu_buffers
-            .as_mut()
+            .as_ref()
             .ok_or_else(|| CfdError::gpu_error("GPU buffers not initialized"))?;
 
         let (nx, ny, _, _) = flow_field.grid_info();