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

src/soft/SoftShaderModule.zig

@@ -14,7 +14,6 @@ pub const Interface = base.ShaderModule;
 
 interface: Interface,
 module: spv.Module,
-module_allocator: std.heap.ArenaAllocator,
 
 /// Pipelines need SPIR-V module reference so shader module may not
 /// be destroy on call to `vkDestroyShaderModule`
@@ -29,10 +28,6 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
     const soft_device: *SoftDevice = @alignCast(@fieldParentPtr("interface", device));
     const device_allocator = soft_device.device_allocator.allocator();
 
-    var module_allocator_arena: std.heap.ArenaAllocator = .init(device_allocator);
-    errdefer module_allocator_arena.deinit();
-    const module_allocator = module_allocator_arena.allocator();
-
     interface.vtable = &.{
         .destroy = destroy,
     };
@@ -41,7 +36,7 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
 
     self.* = .{
         .interface = interface,
-        .module = spv.Module.init(module_allocator, code, .{
+        .module = spv.Module.init(device_allocator, code, .{
             .use_simd_vectors_specializations = base.config.shaders_simd,
         }) catch |err| switch (err) {
             spv.Module.ModuleError.OutOfMemory => return VkError.OutOfHostMemory,
@@ -55,9 +50,9 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
                 return VkError.ValidationFailed;
             },
         },
-        .module_allocator = module_allocator_arena,
         .ref_count = std.atomic.Value(usize).init(1),
     };
+
     return self;
 }
 
@@ -67,7 +62,11 @@ pub fn destroy(interface: *Interface, allocator: std.mem.Allocator) void {
 }
 
 pub fn drop(self: *Self, allocator: std.mem.Allocator) void {
-    self.module_allocator.deinit();
+    const soft_device: *SoftDevice = @alignCast(@fieldParentPtr("interface", self.interface.owner));
+    const device_allocator = soft_device.device_allocator.allocator();
+
+    self.module.deinit(device_allocator);
+
     allocator.destroy(self);
 }