adding base for Xeon Phi driver

src/phi/PhiPipeline.zig

@@ -0,0 +1,37 @@
+const std = @import("std");
+const vk = @import("vulkan");
+const base = @import("base");
+
+const VkError = base.VkError;
+
+const Self = @This();
+pub const Interface = base.Pipeline;
+
+interface: Interface,
+
+pub fn createCompute(device: *base.Device, allocator: std.mem.Allocator, cache: ?*base.PipelineCache, info: *const vk.ComputePipelineCreateInfo) VkError!*Self {
+    const self = allocator.create(Self) catch return VkError.OutOfHostMemory;
+    errdefer allocator.destroy(self);
+
+    var interface = try Interface.initCompute(device, allocator, cache, info);
+    interface.vtable = &.{ .destroy = destroy };
+
+    self.* = .{ .interface = interface };
+    return self;
+}
+
+pub fn createGraphics(device: *base.Device, allocator: std.mem.Allocator, cache: ?*base.PipelineCache, info: *const vk.GraphicsPipelineCreateInfo) VkError!*Self {
+    const self = allocator.create(Self) catch return VkError.OutOfHostMemory;
+    errdefer allocator.destroy(self);
+
+    var interface = try Interface.initGraphics(device, allocator, cache, info);
+    interface.vtable = &.{ .destroy = destroy };
+
+    self.* = .{ .interface = interface };
+    return self;
+}
+
+pub fn destroy(interface: *Interface, allocator: std.mem.Allocator) void {
+    const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
+    allocator.destroy(self);
+}