Add overclocking option -oc to workaround a NVIDIA driver bug (forcefully set to p2 state when using cuda)

src/xnvctrl.c

@@ -0,0 +1,44 @@
+#include "../include/xnvctrl.h"
+#include "../include/library_loader.h"
+#include <string.h>
+
+bool gsr_xnvctrl_load(gsr_xnvctrl *self, Display *display) {
+    memset(self, 0, sizeof(gsr_xnvctrl));
+    self->display = display;
+
+    dlerror(); /* clear */
+    void *lib = dlopen("libXNVCtrl.so.0", RTLD_LAZY);
+    if(!lib) {
+        fprintf(stderr, "gsr error: gsr_xnvctrl_load failed: failed to load libXNVCtrl.so.0, error: %s\n", dlerror());
+        return false;
+    }
+
+    dlsym_assign required_dlsym[] = {
+        { (void**)&self->XNVCTRLQueryExtension, "XNVCTRLQueryExtension" },
+        { (void**)&self->XNVCTRLSetTargetAttributeAndGetStatus, "XNVCTRLSetTargetAttributeAndGetStatus" },
+        { (void**)&self->XNVCTRLQueryValidTargetAttributeValues, "XNVCTRLQueryValidTargetAttributeValues" },
+        { (void**)&self->XNVCTRLQueryTargetStringAttribute, "XNVCTRLQueryTargetStringAttribute" },
+
+        { NULL, NULL }
+    };
+
+    if(!dlsym_load_list(lib, required_dlsym)) {
+        fprintf(stderr, "gsr error: gsr_xnvctrl_load failed: missing required symbols in libXNVCtrl.so.0\n");
+        goto fail;
+    }
+
+    self->library = lib;
+    return true;
+
+    fail:
+    dlclose(lib);
+    memset(self, 0, sizeof(gsr_xnvctrl));
+    return false;
+}
+
+void gsr_xnvctrl_unload(gsr_xnvctrl *self) {
+    if(self->library) {
+        dlclose(self->library);
+        memset(self, 0, sizeof(gsr_xnvctrl));
+    }
+}