Add glTF sampler filters and wrap modes enums

cgltf_sampler defines filter and wrap modes using cgltf_int, which
requires referencing the glTF specification to interpret those integers.
To resolve this, enumerations representing valid glTF sampler filter and
wrap modes are introduced. For backward compatibility, these
enumerations retain their original integer values to allow implicit
conversion to cgltf_int.

cgltf.h

@@ -376,13 +376,30 @@ typedef struct cgltf_image
 	cgltf_extension* extensions;
 } cgltf_image;
 
+typedef enum cgltf_filter_type {
+    cgltf_filter_type_undefined = 0,
+    cgltf_filter_type_nearest = 9728,
+    cgltf_filter_type_linear = 9729,
+    cgltf_filter_type_nearest_mipmap_nearest = 9984,
+    cgltf_filter_type_linear_mipmap_nearest = 9985,
+    cgltf_filter_type_nearest_mipmap_linear = 9986,
+    cgltf_filter_type_linear_mipmap_linear = 9987
+} cgltf_filter_type;
+
+typedef enum cgltf_wrap_mode {
+    cgltf_wrap_mode_clamp_to_edge = 33071,
+    cgltf_wrap_mode_mirrored_repeat = 33648,
+    cgltf_wrap_mode_repeat = 10497,
+    cgltf_wrap_mode_default = cgltf_wrap_mode_repeat
+} cgltf_wrap_mode;
+
 typedef struct cgltf_sampler
 {
 	char* name;
-	cgltf_int mag_filter;
-	cgltf_int min_filter;
-	cgltf_int wrap_s;
-	cgltf_int wrap_t;
+	cgltf_filter_type mag_filter;
+	cgltf_filter_type min_filter;
+	cgltf_wrap_mode wrap_s;
+	cgltf_wrap_mode wrap_t;
 	cgltf_extras extras;
 	cgltf_size extensions_count;
 	cgltf_extension* extensions;
@@ -4420,8 +4437,11 @@ static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tok
 	(void)options;
 	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
 
-	out_sampler->wrap_s = 10497;
-	out_sampler->wrap_t = 10497;
+	out_sampler->mag_filter = cgltf_filter_type_undefined;
+	out_sampler->min_filter = cgltf_filter_type_undefined;
+
+	out_sampler->wrap_s = cgltf_wrap_mode_default;
+	out_sampler->wrap_t = cgltf_wrap_mode_default;
 
 	int size = tokens[i].size;
 	++i;
@@ -4438,28 +4458,28 @@ static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tok
 		{
 			++i;
 			out_sampler->mag_filter
-				= cgltf_json_to_int(tokens + i, json_chunk);
+				= (cgltf_filter_type)cgltf_json_to_int(tokens + i, json_chunk);
 			++i;
 		}
 		else if (cgltf_json_strcmp(tokens + i, json_chunk, "minFilter") == 0)
 		{
 			++i;
 			out_sampler->min_filter
-				= cgltf_json_to_int(tokens + i, json_chunk);
+				= (cgltf_filter_type)cgltf_json_to_int(tokens + i, json_chunk);
 			++i;
 		}
 		else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapS") == 0)
 		{
 			++i;
 			out_sampler->wrap_s
-				= cgltf_json_to_int(tokens + i, json_chunk);
+				= (cgltf_wrap_mode)cgltf_json_to_int(tokens + i, json_chunk);
 			++i;
 		}
 		else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0)
 		{
 			++i;
 			out_sampler->wrap_t
-				= cgltf_json_to_int(tokens + i, json_chunk);
+				= (cgltf_wrap_mode)cgltf_json_to_int(tokens + i, json_chunk);
 			++i;
 		}
 		else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)