use nvml for nvidia gpu memory instead of nvctrl

src/cpu_gpu.h

@@ -76,7 +76,7 @@ void *getNvidiaGpuInfo(void *){
         getNvidiaInfo();
         gpuLoad = nvidiaUtilization.gpu;
         gpuTemp = nvidiaTemp;
-        gpuMemUsed = nvidiaMemUsed();
+        gpuMemUsed = nvidiaMemory.used / (1024 * 1024);
     }
 
     pthread_detach(nvidiaSmiThread);

src/loaders/loader_nvml.cpp

@@ -135,6 +135,18 @@ bool libnvml_loader::Load(const std::string& library_name) {
     return false;
   }
 
+  #if defined(LIBRARY_LOADER_NVML_H_DLOPEN)
+  nvmlDeviceGetMemoryInfo =
+      reinterpret_cast<decltype(this->nvmlDeviceGetMemoryInfo)>(
+          dlsym(library_, "nvmlDeviceGetMemoryInfo"));
+#endif
+#if defined(LIBRARY_LOADER_NVML_H_DT_NEEDED)
+  nvmlDeviceGetMemoryInfo = &::nvmlDeviceGetMemoryInfo;
+#endif
+  if (!nvmlDeviceGetMemoryInfo) {
+    CleanUp(true);
+    return false;
+  }
 
   loaded_ = true;
   return true;

src/meson.build

@@ -40,10 +40,10 @@ vklayer_files = files(
   'nvml.cpp',
   'file_utils.cpp',
   'memory.cpp',
-  'nvctrl.cpp',
+  # 'nvctrl.cpp',
 )
 
-lib_xnvctrl = cc.find_library('XNVCtrl')
+# lib_xnvctrl = cc.find_library('XNVCtrl')
 vklayer_mesa_overlay = shared_library(
   'MangoHud',
   util_files,
@@ -66,8 +66,7 @@ vklayer_mesa_overlay = shared_library(
     vulkan_wsi_deps, 
     libimgui_core_dep, 
     dep_dl,
-    dep_pthread,
-    lib_xnvctrl],
+    dep_pthread],
   include_directories : inc_common,
   link_args : cc.get_supported_link_arguments(['-Wl,-Bsymbolic-functions', '-Wl,-z,relro']),
   install : true

src/nvml.cpp

@@ -8,7 +8,7 @@ nvmlDevice_t nvidiaDevice;
 bool nvmlSuccess = false;
 unsigned int nvidiaTemp;
 struct nvmlUtilization_st nvidiaUtilization;
-struct nvmlMemory_st nvidiaMemory;
+struct nvmlMemory_st nvidiaMemory {};
 
 bool checkNvidia(){
     if (nvml.IsLoaded()){
@@ -29,5 +29,5 @@ void getNvidiaInfo(){
     nvml.nvmlDeviceGetHandleByIndex(0, &nvidiaDevice);
     nvml.nvmlDeviceGetUtilizationRates(nvidiaDevice, &nvidiaUtilization);
     nvml.nvmlDeviceGetTemperature(nvidiaDevice, NVML_TEMPERATURE_GPU, &nvidiaTemp);
-    // nvml.nvmlDeviceGetMemoryInfo(nvidiaDevice, &nvidiaMemory);
+    nvml.nvmlDeviceGetMemoryInfo(nvidiaDevice, &nvidiaMemory);
 }