Hardcore Vulkan migration began

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug",
+            "type": "gdb",
+            "request": "launch",
+            "target": "./zig-out/learnopengl",
+            "cwd": "${workspaceRoot}",
+            "valuesFormatting": "parseText"
+        }
+    ]
+}

build.zig

@@ -3,6 +3,20 @@ const Build = std.Build;
 const Step = Build.Step;
 const GenerateAssetManifest = @import("tools/GenerateAssetManifest.zig");
 
+fn buildVulkanWrapper(b: *Build, target: Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) *Build.Module {
+    const registry = b.dependency("vulkan_headers", .{}).path("registry/vk.xml");
+    const vk_gen = b.dependency("vulkan_zig", .{}).artifact("vulkan-zig-generator");
+    const vk_generate_cmd = b.addRunArtifact(vk_gen);
+    vk_generate_cmd.addFileArg(registry);
+    const vk_zig_path = vk_generate_cmd.addOutputFileArg("vk.zig");
+
+    return b.addModule("vk", .{
+        .root_source_file = vk_zig_path,
+        .optimize = optimize,
+        .target = target,
+    });
+}
+
 // Although this function looks imperative, note that its job is to
 // declaratively construct a build graph that will be executed by an external
 // runner.
@@ -23,6 +37,8 @@ pub fn build(b: *Build) void {
         "Prioritize performance, safety, or binary size for build time tools",
     ) orelse .Debug;
 
+    const vk = buildVulkanWrapper(b, target, optimize);
+
     const tracy = b.dependency("zig-tracy", .{
         .target = target,
         .optimize = optimize,
@@ -67,6 +83,7 @@ pub fn build(b: *Build) void {
         l.root_module.addImport("assets", assets_mod);
         l.root_module.addImport("asset_manifest", asset_manifest_mod);
         l.root_module.addImport("tracy", tracy.module("tracy"));
+        l.root_module.addImport("vk", vk);
         l.linkLibrary(tracy.artifact("tracy"));
     }
 
@@ -153,7 +170,6 @@ pub fn build(b: *Build) void {
 
 const asset_extensions = [_][]const u8{
     "obj",
-    "glsl",
     "prog",
     "png",
     "dds",
@@ -226,8 +242,14 @@ fn buildAssetCompiler(b: *Build, optimize: std.builtin.OptimizeMode, assets_mod:
         //.formats = @as([]const u8, "3DS,3MF,AC,AMF,ASE,Assbin,Assjson,Assxml,B3D,Blender,BVH,C4D,COB,Collada,CSM,DXF,FBX,glTF,glTF2,HMP,IFC,Irr,LWO,LWS,M3D,MD2,MD3,MD5,MDC,MDL,MMD,MS3D,NDO,NFF,Obj,OFF,Ogre,OpenGEX,Ply,Q3BSP,Q3D,Raw,SIB,SMD,Step,STEPParser,STL,Terragen,Unreal,X,X3D,XGL"),
         .formats = @as([]const u8, "Obj,FBX,glTF,glTF2,Blend"),
     });
+    const mach_dxcompiler_dep = b.dependency("mach_dxcompiler", .{
+        .target = b.graph.host,
+        .optimize = optimize,
+        .from_source = true,
+        .spirv = true,
+        .skip_tests = true,
+    });
     const zalgebra_dep = b.dependency("zalgebra", .{});
-
     const assimp_lib = assimp_dep.artifact("assimp");
 
     const assetc = b.addExecutable(.{
@@ -247,8 +269,11 @@ fn buildAssetCompiler(b: *Build, optimize: std.builtin.OptimizeMode, assets_mod:
     assetc.linkSystemLibrary("ispc_texcomp");
 
     const zalgebra_mod = zalgebra_dep.module("zalgebra");
+    const mach_dxcompiler_mod = mach_dxcompiler_dep.module("mach-dxcompiler");
     const formats_mod = b.addModule("formats", .{ .root_source_file = b.path("src/formats.zig") });
+
     formats_mod.addImport("zalgebra", zalgebra_mod);
+    formats_mod.addImport("mach-dxcompiler", mach_dxcompiler_mod);
     formats_mod.addImport("assets", assets_mod);
     assetc.root_module.addImport("formats", formats_mod);
     assetc.root_module.addImport("zalgebra", zalgebra_mod);

build.zig.zon

@@ -31,6 +31,18 @@
             .url = "https://github.com/sergeypdev/zig-tracy/tarball/2b818574810a66deacc424298c1a7679ca6e4375",
             .hash = "1220638bc94d67225a620e1abd71d85b299c8b764490fd51233ed73d76ee44cc5835",
         },
+        .vulkan_headers = .{
+            .url = "https://github.com/KhronosGroup/Vulkan-Headers/archive/v1.3.283.tar.gz",
+            .hash = "1220a7e73d72a0d56bc2a65f9d8999a7c019e42260a0744c408d1cded111bc205e10",
+        },
+        .vulkan_zig = .{
+            .url = "https://github.com/Snektron/vulkan-zig/tarball/66b7b773bb61e2102025f2d5ff0ae8c5f53e19cc",
+            .hash = "12208958f173b8b81bfac797955f0416ab38b21d1f69d4ebf6c7ca460a828a41cd45",
+        },
+        .mach_dxcompiler = .{
+            .url = "https://github.com/sinnwrig/mach-dxcompiler/tarball/c3dfe92f3f04d4a3262dbc1a71f0016b9af92eb4",
+            .hash = "12202f48e7cf06b1f2ecfd84f16effbd5bb9d644ea17e8a6144b4301a4dea198cf9c",
+        },
     },
     .paths = .{
         // This makes *all* files, recursively, included in this package. It is generally

src/AssetManager.zig

@@ -1596,18 +1596,18 @@ const VertexBufferHeap = struct {
         var index_buddy = try BuddyAllocator.init(allocator, 4096, 13);
         errdefer index_buddy.deinit();
 
-        const vertex_buf_size = vertex_buddy.getSize();
+        // const vertex_buf_size = vertex_buddy.getSize();
-        const index_buf_size = index_buddy.getSize();
+        // const index_buf_size = index_buddy.getSize();
 
-        var bufs = [_]gl.GLuint{ 0, 0, 0, 0, 0 };
+        const bufs = [_]gl.GLuint{ 0, 0, 0, 0, 0 };
-        gl.createBuffers(bufs.len, &bufs);
+        // gl.createBuffers(bufs.len, &bufs);
-        errdefer gl.deleteBuffers(bufs.len, &bufs);
+        // errdefer gl.deleteBuffers(bufs.len, &bufs);
 
-        for (bufs) |buf| {
+        // for (bufs) |buf| {
-            if (buf == 0) {
+        //     if (buf == 0) {
-                return error.BufferAllocationFailed;
+        //         return error.BufferAllocationFailed;
-            }
+        //     }
-        }
+        // }
 
         const vertices = Buffer.init(bufs[0], @sizeOf(formats.Vector3));
         const normals = Buffer.init(bufs[1], @sizeOf(formats.Vector3));
@@ -1615,36 +1615,36 @@ const VertexBufferHeap = struct {
         const uvs = Buffer.init(bufs[3], @sizeOf(formats.Vector2));
         const indices = Buffer.init(bufs[4], @sizeOf(formats.Index));
 
-        gl.namedBufferStorage(
+        // gl.namedBufferStorage(
-            vertices.buffer,
+        //     vertices.buffer,
-            @intCast(vertex_buf_size * @sizeOf(formats.Vector3)),
+        //     @intCast(vertex_buf_size * @sizeOf(formats.Vector3)),
-            null,
+        //     null,
-            gl.DYNAMIC_STORAGE_BIT,
+        //     gl.DYNAMIC_STORAGE_BIT,
-        );
+        // );
-        gl.namedBufferStorage(
+        // gl.namedBufferStorage(
-            normals.buffer,
+        //     normals.buffer,
-            @intCast(vertex_buf_size * @sizeOf(formats.Vector3)),
+        //     @intCast(vertex_buf_size * @sizeOf(formats.Vector3)),
-            null,
+        //     null,
-            gl.DYNAMIC_STORAGE_BIT,
+        //     gl.DYNAMIC_STORAGE_BIT,
-        );
+        // );
-        gl.namedBufferStorage(
+        // gl.namedBufferStorage(
-            tangents.buffer,
+        //     tangents.buffer,
-            @intCast(vertex_buf_size * @sizeOf(formats.Vector3)),
+        //     @intCast(vertex_buf_size * @sizeOf(formats.Vector3)),
-            null,
+        //     null,
-            gl.DYNAMIC_STORAGE_BIT,
+        //     gl.DYNAMIC_STORAGE_BIT,
-        );
+        // );
-        gl.namedBufferStorage(
+        // gl.namedBufferStorage(
-            uvs.buffer,
+        //     uvs.buffer,
-            @intCast(vertex_buf_size * @sizeOf(formats.Vector2)),
+        //     @intCast(vertex_buf_size * @sizeOf(formats.Vector2)),
-            null,
+        //     null,
-            gl.DYNAMIC_STORAGE_BIT,
+        //     gl.DYNAMIC_STORAGE_BIT,
-        );
+        // );
-        gl.namedBufferStorage(
+        // gl.namedBufferStorage(
-            indices.buffer,
+        //     indices.buffer,
-            @intCast(index_buf_size * @sizeOf(formats.Index)),
+        //     @intCast(index_buf_size * @sizeOf(formats.Index)),
-            null,
+        //     null,
-            gl.DYNAMIC_STORAGE_BIT,
+        //     gl.DYNAMIC_STORAGE_BIT,
-        );
+        // );
 
         return .{
             .vertex_buddy = vertex_buddy,

src/GraphicsContext.zig

@@ -0,0 +1,534 @@
+const std = @import("std");
+const vk = @import("vk");
+const c = @import("sdl.zig");
+
+pub const GraphicsContext = @This();
+
+const apis: []const vk.ApiInfo = &.{
+    vk.features.version_1_0,
+    vk.features.version_1_1,
+    vk.features.version_1_2,
+    vk.features.version_1_3,
+    vk.extensions.khr_surface,
+    vk.extensions.khr_swapchain,
+};
+
+const BaseDispatch = vk.BaseWrapper(apis);
+const InstanceDispatch = vk.InstanceWrapper(apis);
+const Instance = vk.InstanceProxy(apis);
+const Device = vk.DeviceProxy(apis);
+const DeviceDispatch = Device.Wrapper;
+const CommandBuffer = vk.CommandBufferProxy(apis);
+
+const device_extensions = [_][:0]const u8{
+    vk.extensions.khr_swapchain.name,
+};
+const vk_layers = [_][:0]const u8{"VK_LAYER_KHRONOS_validation"};
+
+const MAX_FRAME_LAG = 3;
+
+allocator: std.mem.Allocator = undefined,
+window: *c.SDL_Window = undefined,
+vkb: BaseDispatch = undefined,
+vki: InstanceDispatch = undefined,
+vkd: DeviceDispatch = undefined,
+device_info: SelectedPhysicalDevice = undefined,
+instance: Instance = undefined,
+device: Device = undefined,
+queues: DeviceQueues = undefined,
+surface: vk.SurfaceKHR = .null_handle,
+swapchain: vk.SwapchainKHR = .null_handle,
+swapchain_extent: vk.Extent2D = .{ .width = 0, .height = 0 },
+swapchain_images: []vk.Image = &.{},
+
+// NOTE: TEST
+frame: u32 = 0,
+frame_syncs: [MAX_FRAME_LAG]Sync = [1]Sync{.{}} ** MAX_FRAME_LAG,
+command_pool: vk.CommandPool = .null_handle,
+
+const Sync = struct {
+    acquire_swapchain_image: vk.Semaphore = .null_handle,
+    draw_sema: vk.Semaphore = .null_handle,
+    draw_fence: vk.Fence = .null_handle,
+
+    pub fn waitForDrawAndReset(self: *Sync, gc: *GraphicsContext) !void {
+        _ = try gc.device.waitForFences(1, &.{self.draw_fence}, vk.TRUE, std.math.maxInt(u64));
+        try gc.device.resetFences(1, &.{self.draw_fence});
+    }
+};
+
+pub fn init(self: *GraphicsContext, allocator: std.mem.Allocator, window: *c.SDL_Window) !void {
+    self.allocator = allocator;
+    self.window = window;
+
+    var scratch: [4096]u8 = undefined;
+    var fba = std.heap.FixedBufferAllocator.init(&scratch);
+    const vkGetInstanceProcAddr: vk.PfnGetInstanceProcAddr = @ptrCast(c.SDL_Vulkan_GetVkGetInstanceProcAddr());
+
+    var sdl_instance_ext_count: c_uint = 0;
+    if (c.SDL_Vulkan_GetInstanceExtensions(window, &sdl_instance_ext_count, null) == c.SDL_FALSE) {
+        std.debug.print("SDL_Vulkan_GetInstanceExtensions: get count {s}\n", .{c.SDL_GetError()});
+        return error.GetSDLExtensions;
+    }
+
+    const sdl_instance_ext_names = try fba.allocator().alloc([*:0]const u8, sdl_instance_ext_count);
+    if (c.SDL_Vulkan_GetInstanceExtensions(window, &sdl_instance_ext_count, @ptrCast(sdl_instance_ext_names.ptr)) == c.SDL_FALSE) {
+        std.debug.print("SDL_Vulkan_GetInstanceExtensions: get names {s}\n", .{c.SDL_GetError()});
+        return error.GetSDLExtensions;
+    }
+
+    std.debug.print("SDL Extensions: {s}\n", .{sdl_instance_ext_names});
+
+    self.vkb = try BaseDispatch.load(vkGetInstanceProcAddr);
+
+    const instance_handle = try self.vkb.createInstance(&vk.InstanceCreateInfo{
+        .p_application_info = &vk.ApplicationInfo{
+            .api_version = vk.API_VERSION_1_3,
+            .application_version = 0,
+            .engine_version = 0,
+        },
+        .pp_enabled_layer_names = @ptrCast((&vk_layers).ptr),
+        .enabled_layer_count = @intCast(vk_layers.len),
+        .enabled_extension_count = @intCast(sdl_instance_ext_names.len),
+        .pp_enabled_extension_names = sdl_instance_ext_names.ptr,
+    }, null);
+
+    self.vki = try InstanceDispatch.load(instance_handle, vkGetInstanceProcAddr);
+    errdefer self.vki.destroyInstance(instance_handle, null);
+    self.instance = Instance.init(instance_handle, &self.vki);
+
+    var sdl_vksurface: c.VkSurfaceKHR = null;
+    if (c.SDL_Vulkan_CreateSurface(window, @as(*c.VkInstance, @ptrCast(&self.instance.handle)).*, &sdl_vksurface) == c.SDL_FALSE) {
+        std.debug.print("SDL_Vulkan_CreateSurface: {s}\n", .{c.SDL_GetError()});
+        return error.SDLVulkanCreateSurface;
+    }
+    std.debug.assert(sdl_vksurface != null);
+    self.surface = @as(*vk.SurfaceKHR, @ptrCast(&sdl_vksurface)).*;
+
+    const physical_devices = try self.instance.enumeratePhysicalDevicesAlloc(fba.allocator());
+    self.device_info = try selectPhysicalDevice(self.instance, self.surface, physical_devices);
+    const queue_config = try selectQueues(self.instance, self.device_info.physical_device);
+
+    const device_create_config = vk.DeviceCreateInfo{
+        .p_next = @ptrCast(&vk.PhysicalDeviceSynchronization2Features{ .synchronization_2 = vk.TRUE }),
+        .p_queue_create_infos = &queue_config.queue_create_info,
+        .queue_create_info_count = queue_config.queue_count,
+        .p_enabled_features = &self.device_info.features,
+        .pp_enabled_layer_names = @ptrCast((&vk_layers).ptr),
+        .enabled_layer_count = @intCast(vk_layers.len),
+        .pp_enabled_extension_names = @ptrCast((&device_extensions).ptr),
+        .enabled_extension_count = @intCast(device_extensions.len),
+    };
+
+    const device_handle = try self.instance.createDevice(self.device_info.physical_device, &device_create_config, null);
+
+    self.vkd = try DeviceDispatch.load(device_handle, self.instance.wrapper.dispatch.vkGetDeviceProcAddr);
+    errdefer self.vkd.destroyDevice(device_handle, null);
+    self.device = Device.init(device_handle, &self.vkd);
+
+    try self.maybeResizeSwapchain();
+    errdefer self.device.destroySwapchainKHR(self.swapchain, null);
+
+    // TODO: handle the case when different queue instance map to the same queue
+    const graphics_queue = QueueInstance{
+        .device = self.device,
+        .family = queue_config.graphics.family,
+        .handle = self.device.getDeviceQueue(queue_config.graphics.family, queue_config.graphics.index),
+    };
+    const compute_queue = QueueInstance{
+        .device = self.device,
+        .family = queue_config.compute.family,
+        .handle = self.device.getDeviceQueue(queue_config.graphics.family, queue_config.compute.index),
+    };
+    const host_to_device_queue = QueueInstance{
+        .device = self.device,
+        .family = queue_config.host_to_device.family,
+        .handle = self.device.getDeviceQueue(queue_config.graphics.family, queue_config.host_to_device.index),
+    };
+    const device_to_host_queue = QueueInstance{
+        .device = self.device,
+        .family = queue_config.device_to_host.family,
+        .handle = self.device.getDeviceQueue(queue_config.graphics.family, queue_config.device_to_host.index),
+    };
+
+    self.queues = DeviceQueues{
+        .graphics = graphics_queue,
+        .compute = compute_queue,
+        .host_to_device = host_to_device_queue,
+        .device_to_host = device_to_host_queue,
+    };
+
+    for (0..MAX_FRAME_LAG) |i| {
+        self.frame_syncs[i].acquire_swapchain_image = try self.device.createSemaphore(&.{}, null);
+        self.frame_syncs[i].draw_sema = try self.device.createSemaphore(&.{}, null);
+        self.frame_syncs[i].draw_fence = try self.device.createFence(&.{ .flags = .{ .signaled_bit = true } }, null);
+    }
+    self.command_pool = try self.queues.graphics.createCommandPool(.{});
+}
+
+pub fn draw(self: *GraphicsContext) !void {
+    var cmd_bufs = [_]vk.CommandBuffer{.null_handle};
+    try self.device.allocateCommandBuffers(&.{
+        .command_pool = self.command_pool,
+        .level = .primary,
+        .command_buffer_count = cmd_bufs.len,
+    }, &cmd_bufs);
+    const test_cmd_buf = CommandBuffer.init(cmd_bufs[0], &self.vkd);
+
+    const sync = &self.frame_syncs[self.frame];
+
+    try sync.waitForDrawAndReset(self);
+
+    // Move this out into a separate func
+    const swapchain_image_index: u32 = blk: {
+        var found = false;
+        var swapchain_img: u32 = 0;
+
+        try self.maybeResizeSwapchain();
+
+        while (!found) {
+            const acquire_result = try self.device.acquireNextImageKHR(self.swapchain, std.math.maxInt(u64), sync.acquire_swapchain_image, .null_handle);
+
+            switch (acquire_result.result) {
+                .success, .suboptimal_khr => {
+                    swapchain_img = acquire_result.image_index;
+                    found = true;
+                },
+                .error_out_of_date_khr => {
+                    // TODO: resize swapchain
+                    std.debug.print("Out of date swapchain\n", .{});
+                    try self.maybeResizeSwapchain();
+                },
+                .error_surface_lost_khr => {
+                    // TODO: recreate surface
+                    return error.SurfaceLost;
+                },
+                .not_ready => return error.SwapchainImageNotReady,
+                .timeout => return error.SwapchainImageTimeout,
+                else => {
+                    std.debug.print("Unexpected value: {}\n", .{acquire_result.result});
+                    @panic("Unexpected");
+                },
+            }
+        }
+
+        break :blk swapchain_img;
+    };
+
+    const current_image = self.swapchain_images[swapchain_image_index];
+
+    try test_cmd_buf.beginCommandBuffer(&.{});
+    {
+        {
+            const img_barrier = vk.ImageMemoryBarrier2{
+                .image = current_image,
+                .old_layout = .undefined,
+                .new_layout = .transfer_dst_optimal,
+                .src_access_mask = .{},
+                .dst_access_mask = .{},
+                .src_queue_family_index = self.queues.graphics.family,
+                .dst_queue_family_index = self.queues.graphics.family,
+                .subresource_range = .{
+                    .aspect_mask = .{ .color_bit = true },
+                    .base_array_layer = 0,
+                    .base_mip_level = 0,
+                    .layer_count = 1,
+                    .level_count = 1,
+                },
+            };
+            test_cmd_buf.pipelineBarrier2(&.{
+                .p_image_memory_barriers = &.{img_barrier},
+                .image_memory_barrier_count = 1,
+            });
+        }
+        test_cmd_buf.clearColorImage(current_image, .transfer_dst_optimal, &.{ .float_32 = .{ 0.8, 0.7, 0.6, 1.0 } }, 1, &.{.{
+            .aspect_mask = .{ .color_bit = true },
+            .base_array_layer = 0,
+            .base_mip_level = 0,
+            .layer_count = 1,
+            .level_count = 1,
+        }});
+        {
+            const img_barrier = vk.ImageMemoryBarrier2{
+                .image = current_image,
+                .old_layout = .transfer_dst_optimal,
+                .new_layout = .present_src_khr,
+                .src_access_mask = .{},
+                .dst_access_mask = .{},
+                .src_queue_family_index = self.queues.graphics.family,
+                .dst_queue_family_index = self.queues.graphics.family,
+                .subresource_range = .{
+                    .aspect_mask = .{ .color_bit = true },
+                    .base_array_layer = 0,
+                    .base_mip_level = 0,
+                    .layer_count = 1,
+                    .level_count = 1,
+                },
+            };
+            test_cmd_buf.pipelineBarrier2(&.{
+                .p_image_memory_barriers = &.{img_barrier},
+                .image_memory_barrier_count = 1,
+            });
+        }
+    }
+    try test_cmd_buf.endCommandBuffer();
+
+    try self.queues.graphics.submit(
+        &SubmitInfo{
+            .wait_semaphores = &.{sync.acquire_swapchain_image},
+            .wait_dst_stage_mask = &.{.{ .transfer_bit = true }},
+            .command_buffers = &.{test_cmd_buf.handle},
+            .signal_semaphores = &.{sync.draw_sema},
+        },
+        sync.draw_fence,
+    );
+
+    _ = try self.device.queuePresentKHR(self.queues.graphics.handle, &.{
+        .swapchain_count = 1,
+        .wait_semaphore_count = 1,
+        .p_wait_semaphores = &.{sync.draw_sema},
+        .p_swapchains = &.{self.swapchain},
+        .p_image_indices = &.{swapchain_image_index},
+    });
+
+    self.frame = (self.frame + 1) % MAX_FRAME_LAG;
+}
+
+fn maybeResizeSwapchain(self: *GraphicsContext) !void {
+    var width: c_int = 0;
+    var height: c_int = 0;
+    c.SDL_Vulkan_GetDrawableSize(self.window, &width, &height);
+    const new_extent = vk.Extent2D{ .width = @intCast(width), .height = @intCast(height) };
+
+    if (self.swapchain_extent.width == new_extent.width and self.swapchain_extent.height == new_extent.height) {
+        return;
+    }
+
+    if (self.swapchain_images.len > 0) {
+        self.allocator.free(self.swapchain_images);
+        self.swapchain_images = &.{};
+    }
+    self.swapchain_extent = new_extent;
+    const surface_caps = self.device_info.surface_capabilities;
+    self.swapchain = try self.device.createSwapchainKHR(&.{
+        .surface = self.surface,
+        .min_image_count = std.math.clamp(3, surface_caps.min_image_count, if (surface_caps.max_image_count == 0) std.math.maxInt(u32) else surface_caps.max_image_count),
+        .image_format = .r8g8b8a8_unorm, // tonemapping handles srgb
+        .image_color_space = .srgb_nonlinear_khr,
+        .image_extent = self.swapchain_extent,
+        .image_array_layers = 1,
+        .image_usage = .{
+            .color_attachment_bit = true,
+            .transfer_dst_bit = true,
+        },
+        .image_sharing_mode = .exclusive,
+        .present_mode = .fifo_khr, // required to be supported
+        .pre_transform = surface_caps.current_transform,
+        .composite_alpha = .{ .opaque_bit_khr = true },
+        .clipped = vk.TRUE,
+        .old_swapchain = self.swapchain,
+    }, null);
+    self.swapchain_images = try self.device.getSwapchainImagesAllocKHR(self.swapchain, self.allocator);
+}
+
+pub const DeviceQueues = struct {
+    graphics: QueueInstance,
+    compute: QueueInstance,
+    host_to_device: QueueInstance,
+    device_to_host: QueueInstance,
+};
+
+pub const SubmitInfo = struct {
+    wait_semaphores: []const vk.Semaphore = &.{},
+    wait_dst_stage_mask: []const vk.PipelineStageFlags = &.{},
+    command_buffers: []const vk.CommandBuffer = &.{},
+    signal_semaphores: []const vk.Semaphore = &.{},
+};
+
+pub const QueueInstance = struct {
+    const Self = @This();
+
+    mu: std.Thread.Mutex = .{},
+    device: Device,
+    handle: vk.Queue,
+    family: u32,
+
+    pub fn createCommandPool(self: *Self, flags: vk.CommandPoolCreateFlags) !vk.CommandPool {
+        return self.device.createCommandPool(&.{
+            .flags = flags,
+            .queue_family_index = self.family,
+        }, null);
+    }
+
+    pub fn submit(self: *Self, info: *const SubmitInfo, fence: vk.Fence) Device.QueueSubmitError!void {
+        std.debug.assert(info.wait_semaphores.len == info.wait_dst_stage_mask.len);
+
+        var vk_submit_info = vk.SubmitInfo{};
+
+        if (info.wait_semaphores.len > 0) {
+            vk_submit_info.p_wait_semaphores = info.wait_semaphores.ptr;
+            vk_submit_info.p_wait_dst_stage_mask = info.wait_dst_stage_mask.ptr;
+            vk_submit_info.wait_semaphore_count = @intCast(info.wait_semaphores.len);
+        }
+
+        if (info.command_buffers.len > 0) {
+            vk_submit_info.p_command_buffers = info.command_buffers.ptr;
+            vk_submit_info.command_buffer_count = @intCast(info.command_buffers.len);
+        }
+
+        if (info.signal_semaphores.len > 0) {
+            vk_submit_info.p_signal_semaphores = info.signal_semaphores.ptr;
+            vk_submit_info.signal_semaphore_count = @intCast(info.signal_semaphores.len);
+        }
+
+        try self.submitVK(&.{vk_submit_info}, fence);
+    }
+
+    pub fn submitVK(self: *Self, infos: []const vk.SubmitInfo, fence: vk.Fence) Device.QueueSubmitError!void {
+        self.mu.lock();
+        defer self.mu.unlock();
+
+        try self.device.queueSubmit(self.handle, @intCast(infos.len), infos.ptr, fence);
+    }
+};
+
+const SelectedPhysicalDevice = struct {
+    physical_device: vk.PhysicalDevice,
+    properties: vk.PhysicalDeviceProperties,
+    features: vk.PhysicalDeviceFeatures,
+    surface_capabilities: vk.SurfaceCapabilitiesKHR,
+};
+
+fn selectPhysicalDevice(vki: Instance, surface: vk.SurfaceKHR, devices: []vk.PhysicalDevice) !SelectedPhysicalDevice {
+    // TODO: select suitable physical device, allow overriding using some user config
+    for (devices) |device| {
+        const props = vki.getPhysicalDeviceProperties(device);
+        const features = vki.getPhysicalDeviceFeatures(device);
+        const surface_caps = try vki.getPhysicalDeviceSurfaceCapabilitiesKHR(device, surface);
+        return SelectedPhysicalDevice{
+            .physical_device = device,
+            .properties = props,
+            .features = features,
+            .surface_capabilities = surface_caps,
+        };
+    }
+
+    return error.NoDeviceFound;
+}
+
+const DeviceQueueConfig = struct {
+    const Config = struct {
+        family: u32,
+        index: u32,
+    };
+    queue_create_info: [4]vk.DeviceQueueCreateInfo = undefined,
+    queue_count: u32 = 0,
+    graphics: Config,
+    compute: Config,
+    host_to_device: Config,
+    device_to_host: Config,
+};
+
+// Hardcode queue priorities, no idea why I would need to use them
+const queue_priorities = [_]f32{ 1.0, 1.0, 1.0, 1.0, 1.0 };
+
+fn selectQueues(instance: Instance, device: vk.PhysicalDevice) !DeviceQueueConfig {
+    var scratch: [1024]u8 = undefined;
+    var fba = std.heap.FixedBufferAllocator.init(&scratch);
+    const queue_family_props = try instance.getPhysicalDeviceQueueFamilyPropertiesAlloc(device, fba.allocator());
+
+    if (queue_family_props.len == 0) {
+        return error.NoQueues;
+    }
+
+    var queue_create_info: [4]vk.DeviceQueueCreateInfo = undefined;
+    var queue_count: u32 = 0;
+    var graphics: ?DeviceQueueConfig.Config = null;
+    var compute: ?DeviceQueueConfig.Config = null;
+    var host_to_device: ?DeviceQueueConfig.Config = null;
+    var device_to_host: ?DeviceQueueConfig.Config = null;
+
+    // We're on Intel most likely, just a single queue for everything :(
+    if (queue_family_props.len == 1) {
+        if (!queue_family_props[0].queue_flags.contains(.{ .graphics_bit = true, .compute_bit = true, .transfer_bit = true })) {
+            return error.InvalidQueue;
+        }
+        graphics = .{ .family = 0, .index = 0 };
+        compute = graphics;
+        device_to_host = graphics;
+        host_to_device = graphics;
+        queue_create_info[0] = .{
+            .queue_family_index = 0,
+            .queue_count = 1,
+            .p_queue_priorities = &queue_priorities,
+        };
+        queue_count = 1;
+    } else {
+        for (queue_family_props, 0..) |props, family_idx| {
+            // Jackpot, generous Jensen provided us with an all powerfull queue family, use it for everything
+            if (props.queue_flags.contains(.{ .graphics_bit = true, .compute_bit = true, .transfer_bit = true }) and props.queue_count >= 4) {
+                graphics = .{
+                    .family = @intCast(family_idx),
+                    .index = 0,
+                };
+                compute = .{
+                    .family = @intCast(family_idx),
+                    .index = 1,
+                };
+                host_to_device = .{
+                    .family = @intCast(family_idx),
+                    .index = 2,
+                };
+                device_to_host = .{
+                    .family = @intCast(family_idx),
+                    .index = 3,
+                };
+                queue_create_info[0] = .{
+                    .queue_family_index = 0,
+                    .queue_count = 4,
+                    .p_queue_priorities = &queue_priorities,
+                };
+                queue_count = 1;
+                break;
+            }
+
+            // TODO: make queue create info for AMD
+            // Probably AMD, one graphics+compute queue, 2 separate compute queues, one pure transfer queue
+            if (props.queue_flags.graphics_bit) {
+                graphics = .{
+                    .family = @intCast(family_idx),
+                    .index = 0,
+                };
+            }
+            if (props.queue_flags.compute_bit and (compute == null or !props.queue_flags.graphics_bit)) {
+                compute = .{
+                    .family = @intCast(family_idx),
+                    .index = 0,
+                };
+            }
+            if (props.queue_flags.transfer_bit and (host_to_device == null or !props.queue_flags.graphics_bit or !props.queue_flags.compute_bit)) {
+                device_to_host = .{
+                    .family = @intCast(family_idx),
+                    .index = 0,
+                };
+                host_to_device = .{
+                    .family = @intCast(family_idx),
+                    .index = 0,
+                };
+            }
+        }
+    }
+
+    if (graphics == null or compute == null or device_to_host == null or host_to_device == null) {
+        return error.MissingQueueFeatures;
+    }
+
+    return .{
+        .queue_create_info = queue_create_info,
+        .queue_count = queue_count,
+        .graphics = graphics.?,
+        .compute = compute.?,
+        .host_to_device = host_to_device.?,
+        .device_to_host = device_to_host.?,
+    };
+}

src/Render.zig

@@ -9,6 +9,9 @@ const math = @import("math.zig");
 const formats = @import("formats.zig");
 const AABB = AssetManager.AABB; // TODO: move AABB out of formats pls
 const tracy = @import("tracy");
+const GraphicsContext = @import("GraphicsContext.zig");
+
+const gc = GraphicsContext.init();
 
 const za = @import("zalgebra");
 const Vec2 = za.Vec2;

src/game.zig

@@ -3,7 +3,7 @@ const globals = @import("globals.zig");
 const InitMemory = globals.InitMemory;
 const GameMemory = globals.GameMemory;
 const c = @import("sdl.zig");
-const gl = @import("gl.zig");
+// const gl = @import("gl.zig");
 const AssetManager = @import("AssetManager.zig");
 const Render = @import("Render.zig");
 const formats = @import("formats.zig");
@@ -16,6 +16,7 @@ const Quat = za.Quat;
 const a = @import("asset_manifest");
 const windows = std.os.windows;
 const tracy = @import("tracy");
+const GraphicsContext = @import("GraphicsContext.zig");
 
 pub extern "dwmapi" fn DwmEnableMMCSS(fEnableMMCSS: windows.BOOL) callconv(windows.WINAPI) windows.HRESULT;
 pub extern "dwmapi" fn DwmFlush() callconv(windows.WINAPI) void;
@@ -42,19 +43,19 @@ fn game_init_window_err(global_allocator: std.mem.Allocator) !void {
     // _ = DwmEnableMMCSS(1);
     try sdl_try(c.SDL_Init(c.SDL_INIT_EVERYTHING));
 
-    try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_DOUBLEBUFFER, 1));
+    // try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_DOUBLEBUFFER, 1));
-    try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_CONTEXT_MAJOR_VERSION, 4));
+    // try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_CONTEXT_MAJOR_VERSION, 4));
-    try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_CONTEXT_MINOR_VERSION, 5));
+    // try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_CONTEXT_MINOR_VERSION, 5));
-    try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_CONTEXT_PROFILE_MASK, c.SDL_GL_CONTEXT_PROFILE_CORE));
+    // try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_CONTEXT_PROFILE_MASK, c.SDL_GL_CONTEXT_PROFILE_CORE));
-    try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, 0));
+    // try sdl_try(c.SDL_GL_SetAttribute(c.SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, 0));
 
     const maybe_window = c.SDL_CreateWindow(
-        "Learn OpenGL with Zig!",
+        "Vulkan Engine",
         c.SDL_WINDOWPOS_UNDEFINED,
         c.SDL_WINDOWPOS_UNDEFINED,
         globals.DEFAULT_WIDTH,
         globals.DEFAULT_HEIGHT,
-        c.SDL_WINDOW_SHOWN | c.SDL_WINDOW_OPENGL | c.SDL_WINDOW_ALLOW_HIGHDPI | c.SDL_WINDOW_RESIZABLE,
+        c.SDL_WINDOW_SHOWN | c.SDL_WINDOW_ALLOW_HIGHDPI | c.SDL_WINDOW_RESIZABLE | c.SDL_WINDOW_VULKAN,
     );
     if (maybe_window == null) {
         std.log.err("SDL Error: {s}", .{c.SDL_GetError()});
@@ -62,26 +63,28 @@ fn game_init_window_err(global_allocator: std.mem.Allocator) !void {
     }
     const window = maybe_window.?;
 
-    const context = c.SDL_GL_CreateContext(window);
+    // const context = c.SDL_GL_CreateContext(window);
 
-    try sdl_try(c.SDL_GL_SetSwapInterval(0));
+    // try sdl_try(c.SDL_GL_SetSwapInterval(0));
 
     globals.g_init = try global_allocator.create(InitMemory);
     globals.g_init_exists = true;
     globals.g_init.* = .{
         .global_allocator = global_allocator,
         .window = window,
-        .context = context,
+        .context = null,
         .width = globals.DEFAULT_WIDTH,
         .height = globals.DEFAULT_HEIGHT,
     };
 
+    try globals.g_init.gc.init(global_allocator, window);
+
     const version = &globals.g_init.syswm_info.version;
     version.major = c.SDL_MAJOR_VERSION;
     version.minor = c.SDL_MINOR_VERSION;
     version.patch = c.SDL_PATCHLEVEL;
 
-    c.SDL_GL_GetDrawableSize(window, &globals.g_init.width, &globals.g_init.height);
+    // c.SDL_GL_GetDrawableSize(window, &globals.g_init.width, &globals.g_init.height);
 
     if (c.SDL_GetWindowWMInfo(window, &globals.g_init.syswm_info) == 0) {
         const err = c.SDL_GetError();
@@ -98,70 +101,70 @@ export fn game_init_window(global_allocator: *std.mem.Allocator) void {
     };
 }
 
-fn loadGL() void {
+// fn loadGL() void {
-    const getProcAddress = struct {
+//     const getProcAddress = struct {
-        fn getProcAddress(ctx: @TypeOf(null), proc: [:0]const u8) ?gl.FunctionPointer {
+//         fn getProcAddress(ctx: @TypeOf(null), proc: [:0]const u8) ?gl.FunctionPointer {
-            _ = ctx;
+//             _ = ctx;
-            return @ptrCast(c.SDL_GL_GetProcAddress(proc));
+//             return @ptrCast(c.SDL_GL_GetProcAddress(proc));
-        }
+//         }
-    }.getProcAddress;
+//     }.getProcAddress;
-    gl.load(null, getProcAddress) catch |err| {
+//     gl.load(null, getProcAddress) catch |err| {
-        std.log.debug("Failed to load gl funcs {}\n", .{err});
+//         std.log.debug("Failed to load gl funcs {}\n", .{err});
-        @panic("gl.load");
+//         @panic("gl.load");
-    };
+//     };
-    gl.GL_ARB_bindless_texture.load(null, getProcAddress) catch |err| {
+//     gl.GL_ARB_bindless_texture.load(null, getProcAddress) catch |err| {
-        std.log.debug("Failed to load gl funcs GL_ARB_bindless_texture {}\n", .{err});
+//         std.log.debug("Failed to load gl funcs GL_ARB_bindless_texture {}\n", .{err});
-        @panic("gl.load");
+//         @panic("gl.load");
-    };
+//     };
-    gl.debugMessageCallback(glDebugCallback, null);
+//     gl.debugMessageCallback(glDebugCallback, null);
-    // gl.enable(gl.DEBUG_OUTPUT);
+//     // gl.enable(gl.DEBUG_OUTPUT);
-    // gl.enable(gl.DEBUG_OUTPUT_SYNCHRONOUS);
+//     // gl.enable(gl.DEBUG_OUTPUT_SYNCHRONOUS);
-}
+// }
-
+//
-fn glDebugCallback(source: gl.GLenum, _type: gl.GLenum, id: gl.GLuint, severity: gl.GLenum, length: gl.GLsizei, message: [*:0]const u8, userParam: ?*anyopaque) callconv(.C) void {
+// fn glDebugCallback(source: gl.GLenum, _type: gl.GLenum, id: gl.GLuint, severity: gl.GLenum, length: gl.GLsizei, message: [*:0]const u8, userParam: ?*anyopaque) callconv(.C) void {
-    _ = userParam; // autofix
+//     _ = userParam; // autofix
-    const source_str = switch (source) {
+//     const source_str = switch (source) {
-        gl.DEBUG_SOURCE_API => "API",
+//         gl.DEBUG_SOURCE_API => "API",
-        gl.DEBUG_SOURCE_WINDOW_SYSTEM => "WindowSystem",
+//         gl.DEBUG_SOURCE_WINDOW_SYSTEM => "WindowSystem",
-        gl.DEBUG_SOURCE_APPLICATION => "App",
+//         gl.DEBUG_SOURCE_APPLICATION => "App",
-        gl.DEBUG_SOURCE_SHADER_COMPILER => "ShaderCompiler",
+//         gl.DEBUG_SOURCE_SHADER_COMPILER => "ShaderCompiler",
-        gl.DEBUG_SOURCE_THIRD_PARTY => "ThirdParty",
+//         gl.DEBUG_SOURCE_THIRD_PARTY => "ThirdParty",
-        gl.DEBUG_SOURCE_OTHER => "Other",
+//         gl.DEBUG_SOURCE_OTHER => "Other",
-        else => unreachable,
+//         else => unreachable,
-    };
+//     };
-    const type_str = switch (_type) {
+//     const type_str = switch (_type) {
-        gl.DEBUG_TYPE_ERROR => "Error",
+//         gl.DEBUG_TYPE_ERROR => "Error",
-        gl.DEBUG_TYPE_DEPRECATED_BEHAVIOR => "Deprecated Behaviour",
+//         gl.DEBUG_TYPE_DEPRECATED_BEHAVIOR => "Deprecated Behaviour",
-        gl.DEBUG_TYPE_UNDEFINED_BEHAVIOR => "Undefined Behaviour",
+//         gl.DEBUG_TYPE_UNDEFINED_BEHAVIOR => "Undefined Behaviour",
-        gl.DEBUG_TYPE_PORTABILITY => "Portability",
+//         gl.DEBUG_TYPE_PORTABILITY => "Portability",
-        gl.DEBUG_TYPE_PERFORMANCE => "Performance",
+//         gl.DEBUG_TYPE_PERFORMANCE => "Performance",
-        gl.DEBUG_TYPE_MARKER => "Marker",
+//         gl.DEBUG_TYPE_MARKER => "Marker",
-        gl.DEBUG_TYPE_PUSH_GROUP => "Push Group",
+//         gl.DEBUG_TYPE_PUSH_GROUP => "Push Group",
-        gl.DEBUG_TYPE_POP_GROUP => "Pop Group",
+//         gl.DEBUG_TYPE_POP_GROUP => "Pop Group",
-        gl.DEBUG_TYPE_OTHER => "Other",
+//         gl.DEBUG_TYPE_OTHER => "Other",
-        else => unreachable,
+//         else => unreachable,
-    };
+//     };
-    switch (severity) {
+//     switch (severity) {
-        gl.DEBUG_SEVERITY_HIGH => {
+//         gl.DEBUG_SEVERITY_HIGH => {
-            std.log.scoped(.OpenGL).err("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
+//             std.log.scoped(.OpenGL).err("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
-        },
+//         },
-        gl.DEBUG_SEVERITY_MEDIUM => {
+//         gl.DEBUG_SEVERITY_MEDIUM => {
-            std.log.scoped(.OpenGL).warn("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
+//             std.log.scoped(.OpenGL).warn("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
-        },
+//         },
-        gl.DEBUG_SEVERITY_LOW => {
+//         gl.DEBUG_SEVERITY_LOW => {
-            std.log.scoped(.OpenGL).debug("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
+//             std.log.scoped(.OpenGL).debug("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
-        },
+//         },
-        gl.DEBUG_SEVERITY_NOTIFICATION => {
+//         gl.DEBUG_SEVERITY_NOTIFICATION => {
-            std.log.scoped(.OpenGL).info("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
+//             std.log.scoped(.OpenGL).info("{s}:{}:{s}: {s}", .{ source_str, id, type_str, message[0..@intCast(length)] });
-        },
+//         },
-        else => unreachable,
+//         else => unreachable,
-    }
+//     }
-}
+// }
 
 const mesh_program = a.ShaderPrograms.mesh;
 
 export fn game_init(global_allocator: *std.mem.Allocator) void {
-    loadGL();
+    // loadGL();
     tracy.startupProfiler();
 
     std.log.debug("game_init\n", .{});
@@ -171,7 +174,7 @@ export fn game_init(global_allocator: *std.mem.Allocator) void {
         .global_allocator = global_allocator.*,
         .frame_fba = std.heap.FixedBufferAllocator.init(frame_arena_buffer),
         .assetman = AssetManager.init(global_allocator.*, globals.g_mem.frame_fba.allocator()),
-        .render = Render.init(global_allocator.*, globals.g_mem.frame_fba.allocator(), &globals.g_mem.assetman),
+        // .render = Render.init(global_allocator.*, globals.g_mem.frame_fba.allocator(), &globals.g_mem.assetman),
         .world = .{ .frame_arena = globals.g_mem.frame_fba.allocator() },
     };
     globals.g_mem.render.camera = &globals.g_mem.free_cam.camera;
@@ -181,13 +184,13 @@ export fn game_init(global_allocator: *std.mem.Allocator) void {
     globals.g_mem.performance_frequency = c.SDL_GetPerformanceFrequency();
     globals.g_mem.last_frame_time = c.SDL_GetPerformanceCounter();
 
-    var majorVer: gl.GLint = 0;
+    // var majorVer: gl.GLint = 0;
-    var minorVer: gl.GLint = 0;
+    // var minorVer: gl.GLint = 0;
-    gl.getIntegerv(gl.MAJOR_VERSION, &majorVer);
+    // gl.getIntegerv(gl.MAJOR_VERSION, &majorVer);
-    gl.getIntegerv(gl.MINOR_VERSION, &minorVer);
+    // gl.getIntegerv(gl.MINOR_VERSION, &minorVer);
-    std.log.debug("OpenGL Version: {}.{}", .{ majorVer, minorVer });
+    // std.log.debug("OpenGL Version: {}.{}", .{ majorVer, minorVer });
 
-    gl.viewport(0, 0, globals.g_init.width, globals.g_init.height);
+    // gl.viewport(0, 0, globals.g_init.width, globals.g_init.height);
 
     _ = globals.g_mem.world.addEntity(.{
         .flags = .{ .dir_light = true, .rotate = true },
@@ -402,7 +405,7 @@ export fn game_update() bool {
                             c.SDL_GL_GetDrawableSize(ginit.window, &ginit.width, &ginit.height);
                             std.log.debug("w: {}, h: {}\n", .{ ginit.width, ginit.height });
 
-                            gl.viewport(0, 0, ginit.width, ginit.height);
+                            // gl.viewport(0, 0, ginit.width, ginit.height);
                         },
                         else => {},
                     }
@@ -458,8 +461,10 @@ export fn game_update() bool {
         }
     }
 
+    ginit.gc.draw() catch @panic("draw error");
+
     // Render
-    {
+    if (false) {
         const zone = tracy.initZone(@src(), .{ .name = "game.render()" });
         defer zone.deinit();
         gmem.render.begin();
@@ -516,11 +521,11 @@ export fn game_update() bool {
         }
     }
 
-    {
+    // {
-        const zone = tracy.initZone(@src(), .{ .name = "SDL_GL_SwapWindow" });
+    //     const zone = tracy.initZone(@src(), .{ .name = "SDL_GL_SwapWindow" });
-        defer zone.deinit();
+    //     defer zone.deinit();
-        c.SDL_GL_SwapWindow(ginit.window);
+    //     c.SDL_GL_SwapWindow(ginit.window);
-    }
+    // }
     tracy.frameMark();
     //c.SDL_Delay(1);
 
@@ -535,7 +540,7 @@ export fn game_shutdown() void {
     gmem.assetman.deinit();
     gmem.global_allocator.free(gmem.frame_fba.buffer);
     gmem.global_allocator.destroy(gmem);
-    gl.disable(gl.DEBUG_OUTPUT);
+    // gl.disable(gl.DEBUG_OUTPUT);
     tracy.shutdownProfiler();
 }
 
@@ -553,7 +558,7 @@ export fn game_hot_reload(init_memory: ?*anyopaque, gmemory: ?*anyopaque) void {
     if (init_memory) |init_mem| {
         globals.g_init = @alignCast(@ptrCast(init_mem));
         globals.g_init_exists = true;
-        loadGL();
+        // loadGL();
     }
     if (gmemory) |gmem| {
         globals.g_mem = @alignCast(@ptrCast(gmem));

src/globals.zig

@@ -3,6 +3,7 @@ const c = @import("sdl.zig");
 const Render = @import("Render.zig");
 const AssetManager = @import("AssetManager.zig");
 const World = @import("entity.zig").World;
+const GraphicsContext = @import("GraphicsContext.zig");
 
 const za = @import("zalgebra");
 const Vec2 = za.Vec2;
@@ -28,12 +29,13 @@ pub const InitMemory = struct {
     fullscreen: bool = false,
     vsync: bool = false,
     syswm_info: c.SDL_SysWMinfo = .{},
+    gc: GraphicsContext = .{},
 };
 pub const GameMemory = struct {
     global_allocator: std.mem.Allocator,
     frame_fba: std.heap.FixedBufferAllocator,
     assetman: AssetManager,
-    render: Render,
+    render: Render = undefined,
     performance_frequency: u64 = 0,
     last_frame_time: u64 = 0,
     delta_time: f32 = 0.0000001,

src/mem/Arena.zig

@@ -0,0 +1,65 @@
+const std = @import("std");
+
+const Arena = @This();
+
+memory: []align(std.mem.page_size) u8,
+ptr: usize = 0,
+commited_pages: usize = 0,
+
+pub fn init(reserve_mem: usize) !Arena {
+    const slice = try std.posix.mmap(null, reserve_mem, std.posix.PROT.NONE, .{ .TYPE = .PRIVATE, .ANONYMOUS = true }, -1, 0);
+
+    return Arena{
+        .memory = slice,
+    };
+}
+
+pub fn allocator(self: *Arena) std.mem.Allocator {
+    return std.mem.Allocator{
+        .ptr = @ptrCast(self),
+        .vtable = &vtable,
+    };
+}
+
+const vtable = std.mem.Allocator.VTable{
+    .alloc = rawAlloc,
+};
+
+/// This function is not intended to be called except from within the
+/// implementation of an Allocator
+pub inline fn rawAlloc(self: *Arena, len: usize, ptr_align: u8, ret_addr: usize) ?[*]u8 {
+    _ = ret_addr; // autofix
+    const result = std.mem.alignForwardLog2(usize, self.ptr, ptr_align);
+
+    const new_ptr = result + len;
+
+    if (new_ptr >= self.memory.len) {
+        return null;
+    }
+
+    if (new_ptr >= self.getLastPageEnd()) {
+        self.reservePagesUpTo(new_ptr) catch {
+            return null;
+        };
+    }
+
+    self.ptr = new_ptr;
+
+    return &self.memory.ptr[result];
+}
+
+inline fn getLastPageEnd(self: *const Arena) usize {
+    return std.mem.page_size * (self.commited_pages + 1);
+}
+
+fn reservePagesUpTo(self: *Arena, addr: usize) !void {
+    while (addr >= self.getLastPageEnd()) {
+        switch (std.os.errno(std.os.linux.mprotect(self.getLastPageEnd(), std.mem.page_size, std.os.linux.PROT.WRITE | std.os.linux.PROT.READ))) {
+            .SUCCESS => {},
+            .ENOMEM => return error.OutOfMemory,
+            .EINVAL => unreachable,
+            else => unreachable,
+        }
+        self.commited_pages += 1;
+    }
+}

src/sdl.zig

@@ -1,6 +1,7 @@
 pub usingnamespace @cImport({
     @cInclude("SDL2/SDL.h");
     @cInclude("SDL2/SDL_syswm.h");
+    @cInclude("SDL2/SDL_vulkan.h");
 });
 
 // When using system sdl2 library this might not be defined