fix crash in immediate present mode

src/au.zig

@@ -240,8 +240,6 @@ const CandidateDeviceInfo = struct {
         defer alloc.free(modes);
         _ = try I.getPhysicalDeviceSurfacePresentModesKHR(pdev, W.surface, &mode_count, modes.ptr);
 
-        std.debug.print("Modes ({s}): {any}\n", .{props.device_name, modes});
-        
         if (std.mem.indexOfAny(vk.PresentModeKHR, modes, &.{
             vk.PresentModeKHR.mailbox_khr,
             vk.PresentModeKHR.immediate_khr,

src/main.zig

@@ -57,10 +57,6 @@ fn record_render(
     cmd.drawIndexed(indices.len, 1, 0, 0, 0);
 }
 
-pub fn loader_wrapper(procname: [*c]const u8, _: ?*anyopaque) callconv(.C) vk.PfnVoidFunction {
-    return c.glfwGetInstanceProcAddress(au.I.handle, procname);
-}
-
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     defer _ = gpa.detectLeaks();
@@ -69,14 +65,6 @@ pub fn main() !void {
     try au.init(alloc);
     defer au.deinit();
 
-    {
-        const props = au.I.getPhysicalDeviceProperties(au.device_config.pdev);
-        std.debug.print(
-            "Selected Device:\n  {s}\n  mode: {}\n",
-            .{ props.device_name, au.device_config.mode },
-        );
-    }
-
     var sc = try au.SwapChain.init(alloc);
     defer sc.deinit();
 
@@ -105,7 +93,6 @@ pub fn main() !void {
     defer uber.deinit();
 
     const vkalloc = au.VkAllocator.init();
-    std.debug.print("heaps: {any}\ntypes: {any}\n", .{ vkalloc.heaps(), vkalloc.types() });
 
     const vertex_buffer = try au.D.createBuffer(&vk.BufferCreateInfo{
         .size = @sizeOf(@TypeOf(vertices)),
@@ -215,14 +202,24 @@ pub fn main() !void {
             }
         }
 
-        _ = try sc.rebuild();
-
         _ = try au.D.waitForFences(1, &.{flight.fence}, vk.TRUE, std.math.maxInt(u64));
         try au.D.resetFences(1, &.{flight.fence});
+
+        // TODO need to check the standard to see what happens to a fence or semaphore on OutOfDateKHR error.
+        //   acquire, submit, and present.
+
+        while (true) {
+            _ = try sc.rebuild();
+
+            const target = sc.acquire(flight.acquire, .null_handle) catch |err| switch (err) {
+                error.OutOfDateKHR => {
+                    sc.mark();
+                    continue;
+                },
+                else => return err,
+            };
+
             try au.D.resetCommandPool(flight.pool, .{});
-
-        const tgt = try sc.acquire(flight.acquire, .null_handle);
-
             var cmd = au.CommandBufferProxy.init(flight.cmd, au.D.wrapper);
             try cmd.beginCommandBuffer(&.{ .flags = .{ .one_time_submit_bit = true } });
 
@@ -231,7 +228,7 @@ pub fn main() !void {
                 .extent = sc.cinfo.image_extent,
             };
 
-        tgt.begin_rendering(cmd, render_area);
+            target.begin_rendering(cmd, render_area);
             record_render(
                 cmd,
                 uber,
@@ -241,7 +238,7 @@ pub fn main() !void {
                 descriptorSet,
             );
             ui.Draw(cmd);
-        tgt.end_rendering(cmd);
+            target.end_rendering(cmd);
 
             for (vertex_data) |*v| {
                 for (v.pos[0..2]) |*f| {
@@ -251,7 +248,7 @@ pub fn main() !void {
 
             try cmd.endCommandBuffer();
 
-        au.Q.submit(
+            try au.Q.submit(
                 1,
                 &.{
                     vk.SubmitInfo{
@@ -265,14 +262,18 @@ pub fn main() !void {
                     },
                 },
                 flight.fence,
-        ) catch {
+            );
-            std.debug.print("Failed to submit.\nWaiting for idle...", .{});
-            au.D.deviceWaitIdle() catch
-                std.debug.print("deviceWaitIdle failed\n", .{});
-            @panic("Submission failed");
-        };
 
-        _ = try sc.present(&.{flight.complete}, tgt); // todo suboptimal?
+            if (sc.present(&.{flight.complete}, target)) |_| {
+                break;
+            } else |err| switch (err) {
+                error.OutOfDateKHR => {
+                    sc.mark();
+                    continue;
+                },
+                else => return err,
+            }
+        }
     }
 
     try au.D.deviceWaitIdle();