From 11aec42474520355517eca41d3c82f989cd1d60a Mon Sep 17 00:00:00 2001
From: jacob <jacob@cagori.com>
Date: Wed, 24 Sep 2025 18:08:09 -0500
Subject: [PATCH] fake swapchain frame latency wait

---
 src/config.h                | 2 +-
 src/gpu/gpu_dx12/gpu_dx12.c | 9 +++++++--
 src/gpu/gpu_dx12/gpu_dx12.h | 2 +-
 src/meta/meta.c             | 1 +
 src/pp/pp.c                 | 8 ++++----
 5 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/config.h b/src/config.h
index 42c7ace3..0499a2f7 100644
--- a/src/config.h
+++ b/src/config.h
@@ -96,4 +96,4 @@
 
 #define VSYNC !RtcIsEnabled
 #define AUDIO_ENABLED 0
-#define FPS_LIMIT 0
+#define FPS_LIMIT 300
diff --git a/src/gpu/gpu_dx12/gpu_dx12.c b/src/gpu/gpu_dx12/gpu_dx12.c
index 89e42a53..ba526ea2 100644
--- a/src/gpu/gpu_dx12/gpu_dx12.c
+++ b/src/gpu/gpu_dx12/gpu_dx12.c
@@ -2112,9 +2112,14 @@ void GPU_ReleaseSwapchain(GPU_Swapchain *swapchain)
     /* TODO */
 }
 
-void GPU_YieldOnSwapchain(GPU_Swapchain *swapchain)
+void GPU_YieldOnSwapchain(GPU_Swapchain *gpu_swapchain)
 {
-    /* TODO */
+    /* TODO: Actually yield, don't block */
+    GPU_D12_Swapchain *swapchain = (GPU_D12_Swapchain *)gpu_swapchain;
+    if (swapchain->waitable)
+    {
+        WaitForSingleObjectEx(swapchain->waitable, 1000, 1);
+    }
 }
 
 i64 GPU_PresentSwapchain(GPU_Swapchain *gpu_swapchain, GPU_Resource *gpu_texture, Vec2I32 backbuffer_size, Vec2I32 dst, i32 vsync)
diff --git a/src/gpu/gpu_dx12/gpu_dx12.h b/src/gpu/gpu_dx12/gpu_dx12.h
index b083e5bd..80da76c0 100644
--- a/src/gpu/gpu_dx12/gpu_dx12.h
+++ b/src/gpu/gpu_dx12/gpu_dx12.h
@@ -12,7 +12,7 @@
 //~ Tweakable defines
 
 #define GPU_D12_TearingIsAllowed        1
-#define GPU_D12_FrameLatency            0  /* TODO: Set this to 1 */
+#define GPU_D12_FrameLatency            1
 #define GPU_D12_SwapchainBufferCount    4
 #define GPU_D12_SwapchainFlags          (((GPU_D12_TearingIsAllowed != 0)   * DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING) \
                                       | ((GPU_D12_FrameLatency != 0)        * DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT))
diff --git a/src/meta/meta.c b/src/meta/meta.c
index f27bf08b..2fe8aed1 100644
--- a/src/meta/meta.c
+++ b/src/meta/meta.c
@@ -922,6 +922,7 @@ JobDef(Build, _, __)
             PushStringToList(arena, &cp.warnings_msvc, Lit("-wd4101"));  /* unreferenced local variable */
             PushStringToList(arena, &cp.warnings_msvc, Lit("-wd4189"));  /* local variable is initialized but not referenced */
             PushStringToList(arena, &cp.warnings_msvc, Lit("-wd4200"));  /* nonstandard extension used: zero-sized array in struct/union */
+            PushStringToList(arena, &cp.warnings_msvc, Lit("-wd4702"));  /* unreachable code */
         }
 
         //- Clang
diff --git a/src/pp/pp.c b/src/pp/pp.c
index a639e904..0d3cc505 100644
--- a/src/pp/pp.c
+++ b/src/pp/pp.c
@@ -2560,10 +2560,6 @@ JobDef(UpdateUserOrSleep, UNUSED sig, UNUSED id)
         P_Window *window = g->window;
         {
             __profn("User sleep");
-            {
-                __profn("Swapchain wait");
-                GPU_YieldOnSwapchain(g->swapchain);
-            }
 #if FPS_LIMIT > 0
             {
                 __profn("Frame limiter wait");
@@ -2571,6 +2567,10 @@ JobDef(UpdateUserOrSleep, UNUSED sig, UNUSED id)
                 time_ns = TimeNs();
             }
 #endif
+            {
+                __profn("Swapchain wait");
+                GPU_YieldOnSwapchain(g->swapchain);
+            }
         }
         UpdateUser(window);
     }