initial commit, 4.5 stable

platform/windows/cpu_feature_validation.c

@@ -0,0 +1,80 @@
+/**************************************************************************/
+/*  cpu_feature_validation.c                                              */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include <windows.h>
+#ifdef _MSC_VER
+#include <intrin.h> // For builtin __cpuid.
+#else
+void __cpuid(int *r_cpuinfo, int p_info) {
+	// Note: Some compilers have a buggy `__cpuid` intrinsic, using inline assembly (based on LLVM-20 implementation) instead.
+	__asm__ __volatile__(
+			"xchgq %%rbx, %q1;"
+			"cpuid;"
+			"xchgq %%rbx, %q1;"
+			: "=a"(r_cpuinfo[0]), "=r"(r_cpuinfo[1]), "=c"(r_cpuinfo[2]), "=d"(r_cpuinfo[3])
+			: "0"(p_info));
+}
+#endif
+
+#ifndef PF_SSE4_2_INSTRUCTIONS_AVAILABLE
+#define PF_SSE4_2_INSTRUCTIONS_AVAILABLE 38
+#endif
+
+#ifdef WINDOWS_SUBSYSTEM_CONSOLE
+extern int WINAPI mainCRTStartup();
+#else
+extern int WINAPI WinMainCRTStartup();
+#endif
+
+#if defined(__GNUC__) || defined(__clang__)
+extern int WINAPI ShimMainCRTStartup() __attribute__((used));
+#endif
+
+extern int WINAPI ShimMainCRTStartup() {
+	BOOL win_sse42_supported = FALSE;
+	BOOL cpuid_sse42_supported = FALSE;
+
+	int cpuinfo[4];
+	__cpuid(cpuinfo, 0x01);
+
+	win_sse42_supported = IsProcessorFeaturePresent(PF_SSE4_2_INSTRUCTIONS_AVAILABLE);
+	cpuid_sse42_supported = cpuinfo[2] & (1 << 20);
+
+	if (win_sse42_supported || cpuid_sse42_supported) {
+#ifdef WINDOWS_SUBSYSTEM_CONSOLE
+		return mainCRTStartup();
+#else
+		return WinMainCRTStartup();
+#endif
+	} else {
+		MessageBoxW(NULL, L"A CPU with SSE4.2 instruction set support is required.", L"Godot Engine", MB_OK | MB_ICONEXCLAMATION | MB_TASKMODAL);
+		return -1;
+	}
+}