Use direct composition for d3d12 backend

drivers/d3d12/rendering_context_driver_d3d12.h

@@ -60,6 +60,7 @@
 #endif
 
 #include "d3dx12.h"
+#include <dcomp.h>
 #include <dxgi1_6.h>
 
 #include <wrl/client.h>
@@ -114,6 +115,9 @@ class RenderingContextDriverD3D12 : public RenderingContextDriver {
 		uint32_t height = 0;
 		DisplayServer::VSyncMode vsync_mode = DisplayServer::VSYNC_ENABLED;
 		bool needs_resize = false;
+		ComPtr<IDCompositionDevice> composition_device;
+		ComPtr<IDCompositionTarget> composition_target;
+		ComPtr<IDCompositionVisual> composition_visual;
 	};
 
 	HMODULE lib_d3d12 = nullptr;

drivers/d3d12/rendering_device_driver_d3d12.cpp

@@ -2469,7 +2469,7 @@ Error RenderingDeviceDriverD3D12::swap_chain_resize(CommandQueueID p_cmd_queue,
 	DXGI_SWAP_CHAIN_DESC1 swap_chain_desc = {};
 	if (swap_chain->d3d_swap_chain != nullptr) {
 		_swap_chain_release_buffers(swap_chain);
-		res = swap_chain->d3d_swap_chain->ResizeBuffers(p_desired_framebuffer_count, 0, 0, DXGI_FORMAT_UNKNOWN, creation_flags);
+		res = swap_chain->d3d_swap_chain->ResizeBuffers(p_desired_framebuffer_count, surface->width, surface->height, DXGI_FORMAT_UNKNOWN, creation_flags);
 		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_UNAVAILABLE);
 	} else {
 		swap_chain_desc.BufferCount = p_desired_framebuffer_count;
@@ -2478,22 +2478,19 @@ Error RenderingDeviceDriverD3D12::swap_chain_resize(CommandQueueID p_cmd_queue,
 		swap_chain_desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
 		swap_chain_desc.SampleDesc.Count = 1;
 		swap_chain_desc.Flags = creation_flags;
-		swap_chain_desc.Scaling = DXGI_SCALING_NONE;
+		swap_chain_desc.Scaling = DXGI_SCALING_STRETCH;
 		if (OS::get_singleton()->is_layered_allowed()) {
 			swap_chain_desc.AlphaMode = DXGI_ALPHA_MODE_PREMULTIPLIED;
 			has_comp_alpha[(uint64_t)p_cmd_queue.id] = true;
 		} else {
 			swap_chain_desc.AlphaMode = DXGI_ALPHA_MODE_IGNORE;
 			has_comp_alpha[(uint64_t)p_cmd_queue.id] = false;
 		}
+		swap_chain_desc.Width = surface->width;
+		swap_chain_desc.Height = surface->height;
 
 		ComPtr<IDXGISwapChain1> swap_chain_1;
-		res = context_driver->dxgi_factory_get()->CreateSwapChainForHwnd(command_queue->d3d_queue.Get(), surface->hwnd, &swap_chain_desc, nullptr, nullptr, swap_chain_1.GetAddressOf());
-		if (!SUCCEEDED(res) && swap_chain_desc.AlphaMode != DXGI_ALPHA_MODE_IGNORE) {
-			swap_chain_desc.AlphaMode = DXGI_ALPHA_MODE_IGNORE;
-			has_comp_alpha[(uint64_t)p_cmd_queue.id] = false;
-			res = context_driver->dxgi_factory_get()->CreateSwapChainForHwnd(command_queue->d3d_queue.Get(), surface->hwnd, &swap_chain_desc, nullptr, nullptr, swap_chain_1.GetAddressOf());
-		}
+		res = context_driver->dxgi_factory_get()->CreateSwapChainForComposition(command_queue->d3d_queue.Get(), &swap_chain_desc, nullptr, swap_chain_1.GetAddressOf());
 		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
 
 		swap_chain_1.As(&swap_chain->d3d_swap_chain);
@@ -2503,6 +2500,32 @@ Error RenderingDeviceDriverD3D12::swap_chain_resize(CommandQueueID p_cmd_queue,
 		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
 	}
 
+	if (surface->composition_device.Get() == nullptr) {
+		res = DCompositionCreateDevice(nullptr, IID_PPV_ARGS(surface->composition_device.GetAddressOf()));
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+
+		res = surface->composition_device->CreateTargetForHwnd(surface->hwnd, TRUE, surface->composition_target.GetAddressOf());
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+
+		res = surface->composition_device->CreateVisual(surface->composition_visual.GetAddressOf());
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+
+		res = surface->composition_visual->SetContent(swap_chain->d3d_swap_chain.Get());
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+
+		res = surface->composition_target->SetRoot(surface->composition_visual.Get());
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+
+		res = surface->composition_device->Commit();
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+	} else {
+		res = surface->composition_visual->SetContent(swap_chain->d3d_swap_chain.Get());
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+
+		res = surface->composition_device->Commit();
+		ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
+	}
+
 	res = swap_chain->d3d_swap_chain->GetDesc1(&swap_chain_desc);
 	ERR_FAIL_COND_V(!SUCCEEDED(res), ERR_CANT_CREATE);
 	ERR_FAIL_COND_V(swap_chain_desc.BufferCount == 0, ERR_CANT_CREATE);

platform/windows/detect.py

@@ -178,13 +178,14 @@ def get_opts():
 
     return [
         ("mingw_prefix", "MinGW prefix", mingw),
-        # Targeted Windows version: 7 (and later), minimum supported version
+        # Targeted Windows version: 8 (and later), minimum supported version
         # XP support dropped after EOL due to missing API for IPv6 and other issues
         # Vista support dropped after EOL due to GH-10243
+        # Windows 7 support dropped after EOL due to GH-95630
         (
             "target_win_version",
-            "Targeted Windows version, >= 0x0601 (Windows 7)",
-            "0x0601",
+            "Targeted Windows version, >= 0x0602 (Windows 8)",
+            "0x0602",
         ),
         EnumVariable("windows_subsystem", "Windows subsystem", "gui", ("gui", "console")),
         (
@@ -945,6 +946,6 @@ def check_d3d12_installed(env):
 
 
 def validate_win_version(env):
-    if int(env["target_win_version"], 16) < 0x0601:
-        print_error("`target_win_version` should be 0x0601 or higher (Windows 7).")
+    if int(env["target_win_version"], 16) < 0x0602:
+        print_error("`target_win_version` should be 0x0602 or higher (Windows 8).")
         sys.exit(255)

platform/windows/display_server_windows.cpp

@@ -2167,6 +2167,10 @@ void DisplayServerWindows::_get_window_style(bool p_main_window, bool p_initiali
 
 	r_style |= WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
 	r_style_ex |= WS_EX_ACCEPTFILES;
+
+	if (OS::get_singleton()->get_current_rendering_driver_name() == "d3d12") {
+		r_style_ex |= WS_EX_NOREDIRECTIONBITMAP;
+	}
 }
 
 void DisplayServerWindows::_update_window_style(WindowID p_window, bool p_repaint) {