Mercurial > sdl-ios-xcode
diff src/audio/SDL_mixer.c @ 539:a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 09 Nov 2002 06:13:28 +0000 |
| parents | f6ffac90895c |
| children | 64fe373be3dc |
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--- a/src/audio/SDL_mixer.c Sat Nov 09 05:52:49 2002 +0000 +++ b/src/audio/SDL_mixer.c Sat Nov 09 06:13:28 2002 +0000 @@ -35,7 +35,24 @@ #include "SDL_mutex.h" #include "SDL_timer.h" #include "SDL_sysaudio.h" +#include "SDL_mixer_MMX.h" +/* Function to check the CPU flags */ +#define MMX_CPU 0x800000 +#ifdef USE_ASMBLIT +#define CPU_Flags() Hermes_X86_CPU() +#else +#define CPU_Flags() 0L +#endif + +#ifdef USE_ASMBLIT +#define X86_ASSEMBLER +#define HermesConverterInterface void +#define HermesClearInterface void +#define STACKCALL + +#include "HeadX86.h" +#endif /* This table is used to add two sound values together and pin * the value to avoid overflow. (used with permission from ARDI) @@ -130,6 +147,15 @@ break; case AUDIO_S8: { + +#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) + if (CPU_Flags() & MMX_CPU) + { + SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); + } + else +#endif + { Sint8 *dst8, *src8; Sint8 src_sample; int dst_sample; @@ -153,10 +179,19 @@ ++dst8; ++src8; } + } } break; case AUDIO_S16LSB: { +#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) + if (CPU_Flags() & MMX_CPU) + { + SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); + } + else +#endif + { Sint16 src1, src2; int dst_sample; const int max_audioval = ((1<<(16-1))-1); @@ -180,6 +215,7 @@ dst[1] = dst_sample&0xFF; dst += 2; } + } } break;