diff --git a/src/gpu/gpu_core.h b/src/gpu/gpu_core.h
index aa7e57b7..f092870e 100644
--- a/src/gpu/gpu_core.h
+++ b/src/gpu/gpu_core.h
@@ -493,4 +493,4 @@ void GPU_YieldOnSwapchain(GPU_Swapchain *swapchain);
  * 2. Blits `texture` into position `dst` in the backbuffer
  * 3. Presents the backbuffer
  * 4. Returns the value that the Direct queue fence will reach once GPU completes blitting (`texture` shouldn't be released while blit is in flight) */
-i64 GPU_PresentSwapchain(GPU_Swapchain *swapchain, GPU_Resource *texture, Vec2I32 backbuffer_size, Vec2I32 dst, i32 vsync);
+i64 GPU_PresentSwapchain(GPU_Swapchain *swapchain, GPU_Resource *texture, i32 vsync, Vec2I32 backbuffer_size, Vec2I32 dst_p0, Vec2I32 dst_p1, Vec2I32 src_p0, Vec2I32 src_p1);
diff --git a/src/gpu/gpu_dx12/gpu_dx12.c b/src/gpu/gpu_dx12/gpu_dx12.c
index bbb30112..b97ca8b1 100644
--- a/src/gpu/gpu_dx12/gpu_dx12.c
+++ b/src/gpu/gpu_dx12/gpu_dx12.c
@@ -1960,7 +1960,7 @@ GPU_D12_SwapchainBuffer *GPU_D12_UpdateSwapchain(GPU_D12_Swapchain *swapchain, V
     return &swapchain->buffers[backbuffer_index];
 }
 
-i64 GPU_D12_BlitToSwapchain(GPU_D12_SwapchainBuffer *dst, GPU_D12_Resource *texture, Vec2I32 dst_pos)
+i64 GPU_D12_BlitToSwapchain(GPU_D12_SwapchainBuffer *dst, GPU_D12_Resource *texture, Vec2I32 dst_p0, Vec2I32 dst_p1, Vec2I32 src_p0, Vec2I32 src_p1)
 {
     GPU_D12_SharedState *g = &GPU_D12_shared_state;
 
@@ -2029,15 +2029,14 @@ i64 GPU_D12_BlitToSwapchain(GPU_D12_SwapchainBuffer *dst, GPU_D12_Resource *text
         src_loc.SubresourceIndex = 0;
 
         Vec2I32 dst_size = swapchain->resolution;
-        Vec2I32 src_size = VEC2I32(texture->desc.texture.size.x, texture->desc.texture.size.y);
 
-        i32 dst_left = dst_pos.x;
-        i32 dst_top = dst_pos.y;
+        i32 dst_top = dst_p0.y;
+        i32 dst_left = dst_p0.x;
 
-        i32 src_left = 0;
-        i32 src_top = 0;
-        i32 src_right = src_size.x;
-        i32 src_bottom = src_size.y;
+        i32 src_left = src_p0.x;
+        i32 src_top = src_p0.y;
+        i32 src_right = src_p1.x;
+        i32 src_bottom = src_p1.y;
 
         /* Clamp copy src & dst */
         if (dst_left < 0)
@@ -2195,7 +2194,7 @@ void GPU_YieldOnSwapchain(GPU_Swapchain *gpu_swapchain)
     }
 }
 
-i64 GPU_PresentSwapchain(GPU_Swapchain *gpu_swapchain, GPU_Resource *gpu_texture, Vec2I32 backbuffer_size, Vec2I32 dst, i32 vsync)
+i64 GPU_PresentSwapchain(GPU_Swapchain *gpu_swapchain, GPU_Resource *gpu_texture, i32 vsync, Vec2I32 backbuffer_size, Vec2I32 dst_p0, Vec2I32 dst_p1, Vec2I32 src_p0, Vec2I32 src_p1)
 {
     GPU_D12_Swapchain *swapchain = (GPU_D12_Swapchain *)gpu_swapchain;
     GPU_D12_Resource *texture = (GPU_D12_Resource *)gpu_texture;
@@ -2215,7 +2214,7 @@ i64 GPU_PresentSwapchain(GPU_Swapchain *gpu_swapchain, GPU_Resource *gpu_texture
     if (is_blitable)
     {
         /* Blit */
-        fence_target = GPU_D12_BlitToSwapchain(swapchain_buffer, texture, dst);
+        fence_target = GPU_D12_BlitToSwapchain(swapchain_buffer, texture, dst_p0, dst_p1, src_p0, src_p1);
 
         u32 present_flags = 0;
         if (GPU_D12_TearingIsAllowed && vsync == 0)
diff --git a/src/gpu/gpu_dx12/gpu_dx12.h b/src/gpu/gpu_dx12/gpu_dx12.h
index f8d1bc52..4050a94a 100644
--- a/src/gpu/gpu_dx12/gpu_dx12.h
+++ b/src/gpu/gpu_dx12/gpu_dx12.h
@@ -380,7 +380,7 @@ u64 GPU_D12_EndRawCommandList(GPU_D12_RawCommandList *cl);
 
 void GPU_D12_InitSwapchainResources(GPU_D12_Swapchain *swapchain);
 GPU_D12_SwapchainBuffer *GPU_D12_UpdateSwapchain(GPU_D12_Swapchain *swapchain, Vec2I32 resolution);
-i64 GPU_D12_BlitToSwapchain(GPU_D12_SwapchainBuffer *swapchain_buffer, GPU_D12_Resource *texture, Vec2I32 dst_pos);
+i64 GPU_D12_BlitToSwapchain(GPU_D12_SwapchainBuffer *dst, GPU_D12_Resource *texture, Vec2I32 dst_p0, Vec2I32 dst_p1, Vec2I32 src_p0, Vec2I32 src_p1);
 
 ////////////////////////////////////////////////////////////
 //~ Sync job
diff --git a/src/pp/pp.c b/src/pp/pp.c
index 3ef02e4e..c9cc1a16 100644
--- a/src/pp/pp.c
+++ b/src/pp/pp.c
@@ -359,10 +359,8 @@ void PP_UpdateUser(void)
 
     //- Begin UI frame
     UI_FrameFlag ui_frame_flags = 0;
-    if (g->ui_debug)
-    {
-        ui_frame_flags |= UI_FrameFlag_Debug;
-    }
+    ui_frame_flags |= UI_FrameFlag_Debug * !!g->ui_debug;
+    ui_frame_flags |= UI_FrameFlag_Vsync * !!VSYNC;
     UI_Frame ui_frame = UI_BeginFrame(ui_frame_flags);
     WND_Frame window_frame = ui_frame.window_frame;
     ControllerEventsArray controller_events = window_frame.controller_events;
diff --git a/src/ui/ui_core.c b/src/ui/ui_core.c
index dbb255a3..a367d35a 100644
--- a/src/ui/ui_core.c
+++ b/src/ui/ui_core.c
@@ -1353,14 +1353,16 @@ i64 UI_EndFrame(UI_Frame frame)
     //- Present & end frame
 
     {
-        /* FIXME: Real xform */
-
         Vec2I32 backbuffer_size = monitor_size;
         if (!g->swapchain)
         {
             g->swapchain = GPU_AcquireSwapchain(frame.window_frame.window_handle, GPU_Format_R8G8B8A8_Unorm, backbuffer_size);
         }
-        g->gpu_submit_fence_target = GPU_PresentSwapchain(g->swapchain, g->render_target, backbuffer_size, VEC2I32(0, 0), VSYNC);
+        Vec2I32 dst_p0 = VEC2I32(0, 0);
+        Vec2I32 dst_p1 = VEC2I32(0, 0);
+        Vec2I32 src_p0 = VEC2I32(0, 0);
+        Vec2I32 src_p1 = draw_size;
+        g->gpu_submit_fence_target = GPU_PresentSwapchain(g->swapchain, g->render_target, AnyBit(g->frame_flags, UI_FrameFlag_Vsync), backbuffer_size, dst_p0, dst_p1, src_p0, src_p1);
     }
     WND_EndFrame(frame.window_frame);
 
diff --git a/src/ui/ui_core.h b/src/ui/ui_core.h
index ced12891..2ab0bcce 100644
--- a/src/ui/ui_core.h
+++ b/src/ui/ui_core.h
@@ -269,6 +269,7 @@ Enum(UI_FrameFlag)
 {
     UI_FrameFlag_None  = 0,
     UI_FrameFlag_Debug = (1 << 0),
+    UI_FrameFlag_Vsync = (1 << 1),
 };
 
 Struct(UI_Frame)