[IR/Flint] adding shared SPIR-V IR and Gen9 vertex lowering

src/software/SoftShaderModule.zig

@@ -5,15 +5,14 @@ const spv = @import("spv");
 
 const VkError = base.VkError;
 
-
 const Self = @This();
 pub const Interface = base.ShaderModule;
 
 interface: Interface,
 module: spv.Module,
 
-/// Pipelines need SPIR-V module reference so shader module may not
-/// be destroy on call to `vkDestroyShaderModule`
+/// Pipelines need a SPIR-V module reference so the shader module may outlive
+/// the application's `vkDestroyShaderModule` call.
 ref_count: std.atomic.Value(usize),
 
 pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const vk.ShaderModuleCreateInfo) VkError!*Self {
@@ -21,6 +20,7 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
     errdefer allocator.destroy(self);
 
     var interface = try Interface.init(device, allocator, info);
+    errdefer interface.deinit();
 
     const device_allocator = device.device_allocator.allocator();
 
@@ -28,11 +28,9 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
         .destroy = destroy,
     };
 
-    const code = info.p_code[0..@divExact(info.code_size, 4)];
-
     self.* = .{
         .interface = interface,
-        .module = spv.Module.init(device_allocator, code, .{
+        .module = spv.Module.init(device_allocator, interface.code(), .{
             .use_simd_vectors_specializations = base.config.soft_shaders_simd,
         }) catch |err| switch (err) {
             spv.Module.ModuleError.OutOfMemory => return VkError.OutOfHostMemory,
@@ -59,9 +57,8 @@ pub fn destroy(interface: *Interface, allocator: std.mem.Allocator) void {
 
 pub fn drop(self: *Self, allocator: std.mem.Allocator) void {
     const device_allocator = self.interface.owner.device_allocator.allocator();
-
     self.module.deinit(device_allocator);
-
+    self.interface.deinit();
     allocator.destroy(self);
 }
 
@@ -70,7 +67,6 @@ pub fn ref(self: *Self) void {
 }
 
 pub fn unref(self: *Self, allocator: std.mem.Allocator) void {
-    if (self.ref_count.fetchSub(1, .release) == 1) {
+    if (self.ref_count.fetchSub(1, .acq_rel) == 1)
         self.drop(allocator);
-    }
 }