Refactor kms_vaapi and kms_cuda

Also fixes color metadata, color range and hdr on nvidia wayland.

include/defs.h

@@ -0,0 +1,28 @@
+#ifndef GSR_DEFS_H
+#define GSR_DEFS_H
+
+typedef enum {
+    GSR_GPU_VENDOR_AMD,
+    GSR_GPU_VENDOR_INTEL,
+    GSR_GPU_VENDOR_NVIDIA
+} gsr_gpu_vendor;
+
+typedef struct {
+    gsr_gpu_vendor vendor;
+    int gpu_version; /* 0 if unknown */
+} gsr_gpu_info;
+
+typedef enum {
+    GSR_MONITOR_ROT_0,
+    GSR_MONITOR_ROT_90,
+    GSR_MONITOR_ROT_180,
+    GSR_MONITOR_ROT_270
+} gsr_monitor_rotation;
+
+typedef enum {
+    GSR_CONNECTION_X11,
+    GSR_CONNECTION_WAYLAND,
+    GSR_CONNECTION_DRM
+} gsr_connection_type;
+
+#endif /* GSR_DEFS_H */