Initial commit

src/vulkan_renderer.zig

@@ -0,0 +1,120 @@
+const std = @import("std");
+const sdl = @import("sdl2");
+const vk = @import("vulkan");
+
+const apis: []const vk.ApiInfo = &.{
+    // You can either add invidiual functions by manually creating an 'api'
+    .{
+        .base_commands = .{
+            .createInstance = true,
+        },
+        .instance_commands = .{
+            .createDevice = true,
+        },
+    },
+    // Or you can add entire feature sets or extensions
+    vk.features.version_1_0,
+    vk.extensions.khr_surface,
+    vk.extensions.khr_swapchain,
+};
+
+const BaseDispatch = vk.BaseWrapper(apis);
+const InstanceDispatch = vk.InstanceWrapper(apis);
+
+const Instance = vk.InstanceProxy(apis);
+
+pub const VulkanRenderer = struct {
+    const Self = @This();
+
+    allocator: std.mem.Allocator,
+
+    vkb: BaseDispatch,
+
+    window: sdl.Window,
+
+    instance: Instance,
+    surface: vk.SurfaceKHR,
+
+    pub fn init(window: sdl.Window, allocator: std.mem.Allocator) !Self {
+        const vkb = try BaseDispatch.load(try sdl.vulkan.getVkGetInstanceProcAddr());
+
+        const extensions = try sdl.vulkan.getInstanceExtensionsAlloc(window, allocator);
+        defer allocator.free(extensions);
+
+        std.debug.print("[Required instance extensions]\n", .{});
+        for (extensions) |ext| {
+            std.debug.print("\t- {s}\n", .{ext});
+        }
+
+        if (!try checkExtensions(vkb, &extensions, allocator)) {
+            return error.ExtensionNotPresent;
+        }
+
+        const app_info = vk.ApplicationInfo{
+            .p_application_name = "Vulkan SDL Test",
+            .application_version = vk.makeApiVersion(0, 0, 1, 0),
+            .p_engine_name = "Vulkan SDL Test",
+            .engine_version = vk.makeApiVersion(0, 0, 1, 0),
+            .api_version = vk.API_VERSION_1_3,
+        };
+
+        const inst = try vkb.createInstance(&.{
+            .p_application_info = &app_info,
+            .enabled_extension_count = @intCast(extensions.len),
+            .pp_enabled_extension_names = @ptrCast(extensions),
+        }, null);
+
+        const vki = try allocator.create(InstanceDispatch);
+        defer allocator.destroy(vki);
+        vki.* = try InstanceDispatch.load(inst, vkb.dispatch.vkGetInstanceProcAddr);
+        var instance = Instance.init(inst, vki);
+        errdefer instance.destroyInstance(null);
+
+        const surface = try sdl.vulkan.createSurface(window, instance.handle);
+
+        var physical_device_count: u32 = 0;
+        _ = try instance.enumeratePhysicalDevices(&physical_device_count, null);
+
+        std.debug.print("Physical devices: {d}\n", .{physical_device_count});
+
+        return .{
+            .allocator = allocator,
+            .window = window,
+            .vkb = vkb,
+            .instance = instance,
+            .surface = surface,
+        };
+    }
+
+    pub fn deinit(self: *Self) void {
+        self.instance.destroySurfaceKHR(self.surface, null);
+        self.instance.destroyInstance(null);
+
+        self.allocator.destroy(self.instance.wrapper);
+    }
+};
+
+fn checkExtensions(vkb: BaseDispatch, required_extensions: *const [][*:0]const u8, allocator: std.mem.Allocator) !bool {
+    var prop_count: u32 = 0;
+    _ = try vkb.enumerateInstanceExtensionProperties(null, &prop_count, null);
+
+    const props = try allocator.alloc(vk.ExtensionProperties, prop_count);
+    defer allocator.free(props);
+
+    _ = try vkb.enumerateInstanceExtensionProperties(null, &prop_count, props.ptr);
+
+    for (required_extensions.*) |required_extension| {
+        var found = false;
+        for (props) |prop| {
+            if (std.mem.eql(u8, std.mem.sliceTo(&prop.extension_name, 0), std.mem.span(required_extension))) {
+                found = true;
+            }
+        }
+
+        if (!found) {
+            return false;
+        }
+    }
+
+    return true;
+}