/**************************************************************************/
/* 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;
}
}