Add 'glfw-vulkan/' from commit 'ce8109c1aa73e1785c78acec5a9ec1bc9fa25099'

git-subtree-dir: glfw-vulkan
git-subtree-mainline: df6751f276
git-subtree-split: ce8109c1aa

glfw-vulkan/src/nu/ImGui.zig

@@ -0,0 +1,110 @@
+//! all imgui code through this path
+
+const std = @import("std");
+
+const vk = @import("vk");
+const nu = @import("../nu.zig");
+
+const Render = @import("Render.zig");
+const Window = @import("Window.zig");
+
+const im = @import("cimgui");
+pub usingnamespace im;
+
+pub const Config = struct {};
+const config = nu.config.imgui;
+
+pub const depends = .{ Render, Window };
+
+pub fn loader_wrapper(procname: [*c]const u8, _: ?*anyopaque) callconv(.C) vk.PfnVoidFunction {
+    return Render.ctx.glfwGetInstanceProcAddress(Render.ctx.instance.*, procname);
+}
+
+var ctx: *im.ImGuiContext = undefined;
+var descriptor_pool: vk.DescriptorPool = undefined;
+
+pub fn setup(_: std.mem.Allocator) !void {
+    ctx = im.igCreateContext(null) orelse {
+        return error.igCreateContextFailed;
+    };
+    errdefer im.igDestroyContext(ctx);
+
+    if (!im.impl.ImGui_ImplVulkan_LoadFunctions(loader_wrapper, null)) {
+        return error.igVulkanLoadFunctionsFailed;
+    }
+
+    if (!im.impl.ImGui_ImplGlfw_InitForVulkan(@ptrCast(Window.handle), true)) {
+        return error.igGlfwInitFailed;
+    }
+    errdefer im.impl.ImGui_ImplGlfw_Shutdown();
+
+    descriptor_pool = try Render.ctx.D.createDescriptorPool(
+        &vk.DescriptorPoolCreateInfo{
+            .flags = .{ .free_descriptor_set_bit = true },
+            .pool_size_count = 1,
+            .p_pool_sizes = &.{vk.DescriptorPoolSize{
+                .descriptor_count = 32,
+                .type = .combined_image_sampler,
+            }},
+            .max_sets = 32,
+        },
+        null,
+    );
+    errdefer Render.ctx.D.destroyDescriptorPool(descriptor_pool, null);
+
+    if (im.impl.ImGui_ImplVulkan_Init(@constCast(&im.impl.ImGui_ImplVulkan_InitInfo{
+        .Instance = @ptrFromInt(@intFromEnum(Render.ctx.instance.*)),
+        .PhysicalDevice = @ptrFromInt(@intFromEnum(Render.ctx.pdevice.*)),
+        .Device = @ptrFromInt(@intFromEnum(Render.ctx.device.*)),
+        .QueueFamily = Render.ctx.family.*, // todo
+        .Queue = @ptrFromInt(@intFromEnum(Render.ctx.Q.handle)), // todo
+        .DescriptorPool = @ptrFromInt(@intFromEnum(descriptor_pool)),
+        .RenderPass = null,
+        .MinImageCount = 2,
+        .ImageCount = @intCast(Render.sc.frames_in_flight),
+        .PipelineRenderingCreateInfo = @bitCast(vk.PipelineRenderingCreateInfo{
+            .view_mask = 0,
+            .depth_attachment_format = .undefined,
+            .stencil_attachment_format = .undefined,
+            .color_attachment_count = 1,
+            .p_color_attachment_formats = &.{Render.sc.cinfo.image_format}, // todo
+        }),
+        .MSAASamples = 0,
+        .PipelineCache = null,
+        .Subpass = 0,
+        .UseDynamicRendering = true,
+        .Allocator = null,
+    })) != true) {
+        return error.igVulkanInitFailed;
+    }
+    errdefer im.impl.ImGui_ImplVulkan_Shutdown();
+
+    if (!im.impl.ImGui_ImplVulkan_CreateFontsTexture()) {
+        return error.igVulkanFontTextureFailed;
+    }
+}
+
+pub fn teardown() void {
+    Render.ctx.D.deviceWaitIdle() catch |err| std.debug.panic("Device wait failed: {!}", .{err});
+    im.impl.ImGui_ImplVulkan_Shutdown();
+    Render.ctx.D.destroyDescriptorPool(descriptor_pool, null);
+    im.impl.ImGui_ImplGlfw_Shutdown();
+    im.igDestroyContext(ctx);
+}
+
+pub fn frame() !void {
+    im.impl.ImGui_ImplGlfw_NewFrame();
+    im.impl.ImGui_ImplVulkan_NewFrame();
+    im.igNewFrame();
+}
+
+pub fn rpresent(cmd: Render.ctx.CommandBufferProxy) void { // todo
+    im.igEndFrame();
+    im.igRender();
+
+    im.impl.ImGui_ImplVulkan_RenderDrawData(
+        @ptrCast(im.igGetDrawData()),
+        @ptrFromInt(@intFromEnum(cmd.handle)),
+        null,
+    );
+}