Reject software renderers in GPU probe (only accept DiscreteGpu/IntegratedGpu)

Author: ciaranra

crates/pecos-gpu-sims/src/gpu_probe.rs

@@ -61,6 +61,18 @@ pub fn request_default_gpu_device(
         device_type: info.device_type,
     };
 
+    // Reject software renderers and unknown device types -- they technically
+    // "work" but OOM on real workloads (common on CI runners without real GPUs)
+    match info.device_type {
+        wgpu::DeviceType::DiscreteGpu | wgpu::DeviceType::IntegratedGpu => {}
+        other => {
+            return Err(GpuStartupError::DeviceCreation {
+                info,
+                error: format!("Device type {other:?} is not a hardware GPU"),
+            });
+        }
+    }
+
     let (device, queue) = pollster::block_on(adapter.request_device(&wgpu::DeviceDescriptor {
         label: Some(label),
         required_features: wgpu::Features::empty(),