From 3bf7c4e61b27b4452e6e956bcf8524318c80a96f Mon Sep 17 00:00:00 2001
From: David Allemang <david.allemang@kitware.com>
Date: Thu, 21 Mar 2024 14:14:43 -0400
Subject: [PATCH] vulkan-tutorial 05

---
 src/Context.zig | 72 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 60 insertions(+), 12 deletions(-)

diff --git a/src/Context.zig b/src/Context.zig
index 4b9b0a8..6f08bca 100644
--- a/src/Context.zig
+++ b/src/Context.zig
@@ -17,6 +17,12 @@ vki: InstanceDispatch,
 vkd: DeviceDispatch,
 
 instance: vk.Instance,
+device: vk.Device,
+
+queues: struct {
+    graphics: vk.Queue,
+},
+
 messenger: if (USE_DEBUG_LAYERS) vk.DebugUtilsMessengerEXT else void,
 
 pub fn init(allocator: std.mem.Allocator) !Self {
@@ -161,26 +167,63 @@ pub fn init(allocator: std.mem.Allocator) !Self {
     defer allocator.free(queue_family_properties);
     vki.getPhysicalDeviceQueueFamilyProperties(selected.device, &queue_family_count, queue_family_properties.ptr);
 
-    var indices = struct {
-        graphics: ?u32 = null,
-    }{};
+    // todo this should be incorporated with physical device selection/ranking.
+    const Indices = struct {
+        graphics: u32,
+    };
+    const indices: Indices = find_index: {
+        var graphics: ?u32 = null;
 
-    for (queue_family_properties, 0..) |prop, idx| {
-        if (indices.graphics == null) {
-            if (prop.queue_flags.graphics_bit) {
-                indices.graphics = @intCast(idx);
+        for (queue_family_properties, 0..) |prop, idx| {
+            if (graphics == null and prop.queue_flags.graphics_bit) {
+                graphics = @intCast(idx);
+            }
+
+            if (graphics != null) {
+                break :find_index .{ .graphics = graphics.? };
             }
         }
 
-        if (indices.graphics != null) {
-            break;
-        }
-    }
+        return error.IncompatibleDeviceQueues;
+    };
+
+    const priorities = [_]f32{1.0};
+    const queue_create_infos = [_]vk.DeviceQueueCreateInfo{
+        .{
+            .queue_family_index = indices.graphics,
+            .queue_count = priorities.len,
+            .p_queue_priorities = &priorities,
+        },
+    };
+
+    const device_create_info = vk.DeviceCreateInfo{
+        .queue_create_info_count = queue_create_infos.len,
+        .p_queue_create_infos = &queue_create_infos,
+        .p_enabled_features = &selected.feats,
+        // .enabled_extension_count = @intCast(exts.items.len),
+        // .pp_enabled_extension_names = exts.items.ptr,
+        .enabled_layer_count = @intCast(layers.items.len),
+        .pp_enabled_layer_names = layers.items.ptr,
+    };
+
+    self.device = try vki.createDevice(
+        selected.device,
+        &device_create_info,
+        null,
+    );
+    self.vkd = try DeviceDispatch.load(self.device, vki.dispatch.vkGetDeviceProcAddr);
+    const vkd = self.vkd;
+    errdefer vkd.destroyDevice(self.device, null);
+
+    self.queues = .{
+        .graphics = vkd.getDeviceQueue(self.device, indices.graphics, 0),
+    };
 
     return self;
 }
 
 pub fn deinit(self: Self) void {
+    self.vkd.destroyDevice(self.device, null);
     if (USE_DEBUG_LAYERS) self.vki.destroyDebugUtilsMessengerEXT(
         self.instance,
         self.messenger,
@@ -260,6 +303,11 @@ const InstanceDispatch = vk.InstanceWrapper(.{
     .getPhysicalDeviceProperties = true,
     .getPhysicalDeviceFeatures = true,
     .getPhysicalDeviceQueueFamilyProperties = true,
+    .createDevice = true,
+    .getDeviceProcAddr = true,
 });
 
-const DeviceDispatch = vk.DeviceWrapper(.{});
+const DeviceDispatch = vk.DeviceWrapper(.{
+    .destroyDevice = true,
+    .getDeviceQueue = true,
+});