From 1b89ff4b252d7a73a3d7e76485847a2ff59a568b Mon Sep 17 00:00:00 2001
From: David Allemang <david.allemang@kitware.com>
Date: Wed, 20 Mar 2024 19:08:59 -0400
Subject: [PATCH] vulkan-tutorial 02

---
 src/Window.zig | 57 ++++++++++++++++++++++++++++++++++++++++++++------
 src/main.zig   |  9 ++++----
 2 files changed, 56 insertions(+), 10 deletions(-)

diff --git a/src/Window.zig b/src/Window.zig
index fa39cce..690d9f9 100644
--- a/src/Window.zig
+++ b/src/Window.zig
@@ -4,16 +4,26 @@ const std = @import("std");
 const c = @import("c.zig");
 const vk = @import("vk");
 
-const BaseDispatch = vk.BaseWrapper(.{});
-const InstanceDispatch = vk.InstanceWrapper(.{});
+const BaseDispatch = vk.BaseWrapper(.{
+    .createInstance = true,
+    .getInstanceProcAddr = true,
+    .enumerateInstanceExtensionProperties = true,
+});
+const InstanceDispatch = vk.InstanceWrapper(.{
+    .destroyInstance = true,
+});
 const DeviceDispatch = vk.DeviceWrapper(.{});
 
+allocator: std.mem.Allocator,
+
 vkb: BaseDispatch,
 vki: InstanceDispatch,
 vkd: DeviceDispatch,
 
 window: *c.GLFWwindow,
 
+instance: vk.Instance,
+
 pub fn mainLoop(self: Self) void {
     while (c.glfwWindowShouldClose(self.window) == 0) : (c.glfwPollEvents()) {
         c.glfwSwapBuffers(self.window);
@@ -29,7 +39,7 @@ fn initWindow(self: *Self) !void {
         null,
         null,
     ) orelse return error.glfwCreateWindowFailed;
-    errdefer self.deinitWindow();
+    errdefer c.glfwDestroyWindow(self.window);
 }
 
 fn deinitWindow(self: Self) void {
@@ -37,15 +47,50 @@ fn deinitWindow(self: Self) void {
 }
 
 fn initVulkan(self: *Self) !void {
-    _ = self;
+    self.vkb = try BaseDispatch.load(&c.glfwGetInstanceProcAddress);
+
+    const app_info = vk.ApplicationInfo{
+        .p_application_name = "Hello World",
+        .application_version = vk.makeApiVersion(0, 0, 0, 0),
+        .p_engine_name = "No Engine",
+        .engine_version = vk.makeApiVersion(0, 0, 0, 0),
+        .api_version = vk.API_VERSION_1_3,
+    };
+
+    var glfw_ext_count: u32 = 0;
+    const glfw_exts = c.glfwGetRequiredInstanceExtensions(&glfw_ext_count);
+
+    const create_info = vk.InstanceCreateInfo{
+        .p_application_info = &app_info,
+        .enabled_extension_count = glfw_ext_count,
+        .pp_enabled_extension_names = @as([*]const [*:0]const u8, @ptrCast(glfw_exts)),
+        .enabled_layer_count = 0,
+    };
+
+    self.instance = try self.vkb.createInstance(&create_info, null);
+    self.vki = try InstanceDispatch.load(self.instance, self.vkb.dispatch.vkGetInstanceProcAddr);
+    errdefer self.vki.destroyInstance(self.instance, null);
+
+    var ext_count: u32 = 0;
+    _ = try self.vkb.enumerateInstanceExtensionProperties(null, &ext_count, null);
+    const extensions = try self.allocator.alloc(vk.ExtensionProperties, ext_count);
+    defer self.allocator.free(extensions);
+    _ = try self.vkb.enumerateInstanceExtensionProperties(null, &ext_count, extensions.ptr);
+
+    std.debug.print("available extensions:\n", .{});
+    for (extensions) |ext| {
+        std.debug.print("- {s}\n", .{ext.extension_name});
+    }
 }
 
 fn deinitVulkan(self: Self) void {
-    _ = self;
+    self.vki.destroyInstance(self.instance, null);
 }
 
-pub fn init() !Self {
+pub fn init(allocator: std.mem.Allocator) !Self {
     var self: Self = undefined;
+    self.allocator = allocator;
+
     try self.initWindow();
     errdefer self.deinitWindow();
     try self.initVulkan();
diff --git a/src/main.zig b/src/main.zig
index a2a712f..9234539 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -55,18 +55,19 @@ const Window = @import("Window.zig");
 // };
 
 pub fn main() !void {
-    // var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    // const allocator = gpa.allocator();
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer _ = gpa.detectLeaks();
 
     if (c.glfwInit() != c.GLFW_TRUE) {
         return error.GlfwInitFailed;
     }
     defer c.glfwTerminate();
 
-    const window = try Window.init();
+    const window = try Window.init(allocator);
     defer window.deinit();
 
-    window.mainLoop();
+    // window.mainLoop();
 
     // c.glfwWindowHint(c.GLFW_CLIENT_API, c.GLFW_NO_API);
     // const window: *c.GLFWwindow = c.glfwCreateWindow(1280, 720, "Hello World!", null, null) orelse return error.GlfwWindowFailed;