adding fragment derivatives, base pipeline cache, missing KHR function to avoid CTS crash + lots of minor bugfixes

src/vulkan/utils.zig

@@ -1,3 +1,29 @@
+const std = @import("std");
+const vk = @import("vulkan");
+
+pub fn boundedName(name: [*:0]const u8, max_len: usize) ?[]const u8 {
+    const bytes = name[0..max_len];
+    const len = std.mem.indexOfScalar(u8, bytes, 0) orelse return null;
+    return bytes[0..len];
+}
+
+pub fn propertyName(comptime max_len: usize, name: *const [max_len]u8) []const u8 {
+    return std.mem.sliceTo(name[0..], 0);
+}
+
+pub fn extensionName(name: *const [vk.MAX_EXTENSION_NAME_SIZE]u8) []const u8 {
+    return propertyName(vk.MAX_EXTENSION_NAME_SIZE, name);
+}
+
+pub fn isSupportedExtension(name: []const u8, extensions: []const vk.ExtensionProperties) bool {
+    for (extensions) |extension| {
+        if (std.mem.eql(u8, name, extensionName(&extension.extension_name))) {
+            return true;
+        }
+    }
+    return false;
+}
+
 pub fn writePacked(comptime T: type, bytes: []u8, value: T) void {
     const raw: [@sizeOf(T)]u8 = @bitCast(value);
     @memcpy(bytes[0..@sizeOf(T)], raw[0..]);