[vkgen] Support ignored fields

This allows having sections in a spec used for things like `properties`
that have no corresponding fields in the actual struct: the field is
ignored when parsing and no cexpr field symbol is emitted.

libs/video/renderer/vulkan/vkgen/Makemodule.am

@@ -11,6 +11,7 @@ vkgen_dat_src= \
 	libs/video/renderer/vulkan/vkgen/vkfieldcustom.r \
 	libs/video/renderer/vulkan/vkgen/vkfielddata.r \
 	libs/video/renderer/vulkan/vkgen/vkfielddef.r \
+	libs/video/renderer/vulkan/vkgen/vkfieldignore.r \
 	libs/video/renderer/vulkan/vkgen/vkfieldreadonly.r \
 	libs/video/renderer/vulkan/vkgen/vkfieldsingle.r \
 	libs/video/renderer/vulkan/vkgen/vkfieldstring.r \
@@ -55,6 +56,7 @@ EXTRA_DIST += \
 	libs/video/renderer/vulkan/vkgen/vkfieldcustom.h \
 	libs/video/renderer/vulkan/vkgen/vkfielddata.h \
 	libs/video/renderer/vulkan/vkgen/vkfielddef.h \
+	libs/video/renderer/vulkan/vkgen/vkfieldignore.h \
 	libs/video/renderer/vulkan/vkgen/vkfieldreadonly.h \
 	libs/video/renderer/vulkan/vkgen/vkfieldsingle.h \
 	libs/video/renderer/vulkan/vkgen/vkfieldstring.h \

libs/video/renderer/vulkan/vkgen/vkfielddef.r

@@ -6,6 +6,7 @@
 #include "vkfieldcustom.h"
 #include "vkfielddata.h"
 #include "vkfielddef.h"
+#include "vkfieldignore.h"
 #include "vkfieldreadonly.h"
 #include "vkfieldsingle.h"
 #include "vkfieldstring.h"
@@ -45,6 +46,8 @@
 			return [[[ArrayField alloc] init:item struct:strct field:fname] autorelease];
 		case "readonly":
 			return [[[ReadOnlyField alloc] init:item struct:strct field:fname] autorelease];
+		case "ignore":
+			return [[[IgnoreField alloc] init:item struct:strct field:fname] autorelease];
 	}
 	return nil;
 }

libs/video/renderer/vulkan/vkgen/vkfieldignore.h

@@ -0,0 +1,14 @@
+#ifndef __renderer_vulkan_vkgen_vkfieldignore_h
+#define __renderer_vulkan_vkgen_vkfieldignore_h
+
+#include "vkfielddef.h"
+
+@class FieldType;
+
+@interface IgnoreField: FieldDef
+{
+	FieldType *type;
+}
+@end
+
+#endif//__renderer_vulkan_vkgen_vkfieldignore_h

libs/video/renderer/vulkan/vkgen/vkfieldignore.r

@@ -0,0 +1,63 @@
+#include <string.h>
+#include <PropertyList.h>
+
+#include "vkfieldignore.h"
+#include "vkfieldtype.h"
+#include "vkstruct.h"
+
+@implementation IgnoreField
+
+-init:(PLItem *)item struct:(Struct *)strct field:(string)fname
+{
+	self = [super init];
+	if (!self) {
+		return self;
+	}
+
+	line = [item line];
+	struct_name = str_hold ([strct outname]);
+	field_name = str_hold (fname);
+	return self;
+}
+
+-fromField:(qfot_var_t *)field struct:(Struct *)strct
+{
+	return self;
+}
+
+-(void)dealloc
+{
+	str_free (struct_name);
+	str_free (field_name);
+	[super dealloc];
+}
+
+-writeParseData
+{
+	return self;
+}
+
+-writeField
+{
+	string      parse_type = [FieldType anyType];
+	fprintf (output_file, "\t{\"%s\", 0, %s, parse_%s, 0},\n",
+			 field_name, parse_type, "ignore");
+	return self;
+}
+
+-writeSymbol
+{
+	return self;
+}
+
+-(string) name
+{
+	return field_name;
+}
+
+-(int) searchType
+{
+	return 1;
+}
+
+@end