Find /dev/dri/card path that exists (the first one)

include/capture/kms_vaapi.h

@@ -12,6 +12,7 @@ typedef struct {
     Display *dpy;
     const char *display_to_capture; /* if this is "screen", then the entire x11 screen is captured (all displays). A copy is made of this */
     gsr_gpu_info gpu_inf;
+    const char *card_path; /* reference */
 } gsr_capture_kms_vaapi_params;
 
 gsr_capture* gsr_capture_kms_vaapi_create(const gsr_capture_kms_vaapi_params *params);

include/capture/xcomposite_vaapi.h

@@ -11,6 +11,7 @@ typedef struct {
     Window window;
     bool follow_focused; /* If this is set then |window| is ignored */
     vec2i region_size; /* This is currently only used with |follow_focused| */
+    const char *card_path; /* reference */
 } gsr_capture_xcomposite_vaapi_params;
 
 gsr_capture* gsr_capture_xcomposite_vaapi_create(const gsr_capture_xcomposite_vaapi_params *params);

include/utils.h

@@ -36,4 +36,7 @@ bool get_monitor_by_name(Display *display, const char *name, gsr_monitor *monito
 
 bool gl_get_gpu_info(Display *dpy, gsr_gpu_info *info);
 
+/* |output| should be at least 128 bytes in size */
+bool gsr_get_valid_card_path(char *output);
+
 #endif /* GSR_UTILS_H */