Merge pull request surge-synthesizer#1 from kurasu/master

updating from kurasu

README.md

@@ -137,3 +137,7 @@ An example of setting the environment variable `VST2SDK_DIR` would be:
 ```export VST2SDK_DIR=~/programming/VST_SDK_2.4```
 
 ***NOTE***: This environment variable needs to be set _before_ running `premake5 xcode4` - which generates projects / and is part of the `build-osx.sh` script.
+
+## References
+
+* IRC channel #surgesynth @ irc.freenode.net

src/common/AbstractSynthesizer.cpp

@@ -2,41 +2,37 @@
 //	Copyright 2005 Claes Johanson & vember|audio
 //-------------------------------------------------------------------------------------------------------
 #include "AbstractSynthesizer.h"
+#if WINDOWS
+#include <Windows.h>
+#endif
 
-#define SSE_STATE_FLAG 0x8040
-
-#if !MAC && !__linux__
 #include <CpuArchitecture.h>
 
-int SSE_VERSION;
-
-#include <Windows.h>
-#endif
+const char *SSE2ErrorText =
+   "This plugin requires a CPU supporting the SSE2 instruction set.";
+const char *CMOVErrorText =
+   "This plugin requires a CPU supporting the CMOV instruction.";
 
 void initDllGlobals()
 {
-#if !MAC && !__linux__ // intel macs always support SSE2
-   unsigned int arch = determine_support();
-   // detect
-   if (arch & ca_SSE3)
-   {
-      SSE_VERSION = 3;
-   }
-   else if (arch & ca_SSE2)
-   {
-      SSE_VERSION = 2;
-   }
-   else
+   initCpuArchitecture();
+
+   if (!(CpuArchitecture & CaSSE2))
    {
-      SSE_VERSION = 0;
-      MessageBox(::GetActiveWindow(),
-                 "This plugin requires a CPU supporting the SSE2 instruction set.",
+#if WINDOWS
+      MessageBox(::GetActiveWindow(), SSE2ErrorText,
                  "Surge: System requirements not met", MB_OK | MB_ICONERROR);
+#else
+      fprintf(stderr, "%s: %s", __func__, SSE2ErrorText);
+#endif
    }
-   if (!(arch & ca_CMOV))
+   if (!(CpuArchitecture & CaCMOV))
    {
-      MessageBox(::GetActiveWindow(), "This plugin requires a CPU supporting the CMOV instruction.",
+#if WINDOWS
+      MessageBox(::GetActiveWindow(), CMOVErrorText,
                  "Surge: System requirements not met", MB_OK | MB_ICONERROR);
-   }
+#else
+      fprintf(stderr, "%s: %s", __func__, CMOVErrorText);
 #endif
+   }
 }

src/common/CpuArchitecture.cpp

@@ -1,44 +1,33 @@
-#if !MAC
 #include "CpuArchitecture.h"
 #include <string.h>
 
+unsigned int CpuArchitecture = 0;
+
 extern "C" void __cpuid(int* CPUInfo, int InfoType);
 #pragma intrinsic(__cpuid)
 
-unsigned int determine_support()
+void initCpuArchitecture()
 {
-   unsigned int arch = 0;
+#if WINDOWS
    int CPUInfo[4] = {-1};
    __cpuid(CPUInfo, 0);
    char vendor[12];
    memcpy(vendor, &CPUInfo[1], 4 * sizeof(char));
    memcpy(&vendor[8], &CPUInfo[2], 4 * sizeof(char));
    memcpy(&vendor[4], &CPUInfo[3], 4 * sizeof(char));
    if (!CPUInfo[0])
-      return 0; // no additional instructions supported
+      return; // no additional instructions supported
 
    __cpuid(CPUInfo, 1);
    if ((1 << 15) & CPUInfo[3])
-      arch |= ca_CMOV;
-   if ((1 << 25) & CPUInfo[3])
-      arch |= ca_SSE;
+      CpuArchitecture |= CaCMOV;
    if ((1 << 26) & CPUInfo[3])
-      arch |= ca_SSE2;
-   if (CPUInfo[2] & 0x1)
-      arch |= ca_SSE3;
-
-   // get number of extended pages
-   __cpuid(CPUInfo, 0x80000000);
-   unsigned int extendedpages = CPUInfo[0];
-
-   // determine 3DNow! support
-   if (!strncmp("AuthenticAMD", vendor, 12) && (extendedpages >= 0x80000001))
-   {
-      __cpuid(CPUInfo, 0x80000001);
-      if (((1 << 30) & CPUInfo[3]) && ((1 << 31) & CPUInfo[3]))
-         arch |= ca_3DNOW;
-   }
-
-   return arch;
+      CpuArchitecture |= CaSSE2;
+#else
+   __builtin_cpu_init();
+   if (__builtin_cpu_supports("sse2"))
+      CpuArchitecture |= CaSSE2;
+   if (__builtin_cpu_supports("cmov"))
+      CpuArchitecture |= CaCMOV;
+#endif
 }
-#endif

src/common/CpuArchitecture.h

@@ -1,13 +1,14 @@
+#ifndef CPUARCHITECTURE_H
+#define CPUARCHITECTURE_H
 
 enum CpuArchitecture
 {
-   ca_SSE = 0x1,
-   ca_SSE2 = 0x2,
-   ca_SSE3 = 0x4,
-   ca_3DNOW = 0x8,
-   ca_X64 = 0x10,
-   ca_PPC = 0x20,
-   ca_CMOV = 0x40,
+   CaSSE2 = 0x2,
+   CaCMOV = 0x40,
 };
 
-unsigned int determine_support();
+extern unsigned int CpuArchitecture;
+
+void initCpuArchitecture();
+
+#endif // CPUARCHITECTURE_H