Fix T68944: Added check for SSE4.1 to denoising node.

Since OpenImageDenoise requires a CPU with SSE 4.1 or newer,
let the node act as passthrough on unsupported CPUs and display
a message in the node itself.

source/blender/blenlib/BLI_system.h

@@ -24,6 +24,7 @@
  */
 
 int BLI_cpu_support_sse2(void);
+int BLI_cpu_support_sse41(void);
 void BLI_system_backtrace(FILE *fp);
 
 /* Get CPU brand, result is to be MEM_freeN()-ed. */

source/blender/blenlib/intern/system.c

@@ -179,6 +179,19 @@ char *BLI_cpu_brand_string(void)
   return NULL;
 }
 
+int BLI_cpu_support_sse41(void)
+{
+  int result[4], num;
+  __cpuid(result, 0);
+  num = result[0];
+
+  if (num >= 1) {
+    __cpuid(result, 0x00000001);
+    return (result[2] & ((int)1 << 19)) != 0;
+  }
+  return 0;
+}
+
 void BLI_hostname_get(char *buffer, size_t bufsize)
 {
 #ifndef WIN32

source/blender/compositor/operations/COM_DenoiseOperation.cpp

@@ -97,6 +97,7 @@ void DenoiseOperation::generateDenoise(float *data,
     return;
   }
 #ifdef WITH_OPENIMAGEDENOISE
+  if (BLI_cpu_support_sse41()) {
     oidn::DeviceRef device = oidn::newDevice();
     device.commit();
 
@@ -153,10 +154,12 @@ void DenoiseOperation::generateDenoise(float *data,
     for (size_t i = 0; i < numPixels; ++i) {
       data[i * 4 + 3] = inputBufferColor[i * 4 + 3];
     }
-#else
+    return;
+  }
+#endif
+  /* If built without OIDN or running on an unsupported CPU, just pass through. */
   UNUSED_VARS(inputTileAlbedo, inputTileNormal, settings);
   ::memcpy(data,
            inputBufferColor,
            inputTileColor->getWidth() * inputTileColor->getHeight() * sizeof(float) * 4);
-#endif
 }

source/blender/editors/space_node/drawnode.c

@@ -2703,6 +2703,10 @@ static void node_composit_buts_denoise(uiLayout *layout, bContext *UNUSED(C), Po
 {
 #ifndef WITH_OPENIMAGEDENOISE
   uiItemL(layout, IFACE_("Disabled, built without OpenImageDenoise"), ICON_ERROR);
+#else
+  if (!BLI_cpu_support_sse41()) {
+    uiItemL(layout, IFACE_("Disabled, CPU with SSE4.1 is required"), ICON_ERROR);
+  }
 #endif
 
   uiItemR(layout, ptr, "use_hdr", 0, NULL, ICON_NONE);