Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Browse files
Browse the repository at this point in the history
Added MMX audio mixing code for gcc (thanks Stephane!)
- Loading branch information
Showing
5 changed files
with
238 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,185 @@ | ||
// MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples | ||
// Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) | ||
// This code is licensed under the LGPL (see COPYING for details) | ||
// | ||
// Assumes buffer size in bytes is a multiple of 16 | ||
// Assumes SDL_MIX_MAXVOLUME = 128 | ||
|
||
|
||
//////////////////////////////////////////////// | ||
// Mixing for 16 bit signed buffers | ||
//////////////////////////////////////////////// | ||
|
||
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) | ||
void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume) | ||
{ | ||
__asm__ __volatile__ ( | ||
|
||
" movl %0,%%edi\n" // edi = dst | ||
" movl %1,%%esi\n" // esi = src | ||
" movl %3,%%eax\n" // eax = volume | ||
|
||
" movl %2,%%ebx\n" // ebx = size | ||
|
||
" shrl $4,%%ebx\n" // process 16 bytes per iteration = 8 samples | ||
|
||
" jz .endS16\n" | ||
|
||
" pxor %%mm0,%%mm0\n" | ||
|
||
" movd %%eax,%%mm0\n" | ||
" movq %%mm0,%%mm1\n" | ||
" psllq $16,%%mm0\n" | ||
" por %%mm1,%%mm0\n" | ||
" psllq $16,%%mm0\n" | ||
" por %%mm1,%%mm0\n" | ||
" psllq $16,%%mm0\n" | ||
" por %%mm1,%%mm0\n" // mm0 = vol|vol|vol|vol | ||
|
||
".align 16\n" | ||
" .mixloopS16:\n" | ||
|
||
" movq (%%esi),%%mm1\n" // mm1 = a|b|c|d | ||
|
||
" movq %%mm1,%%mm2\n" // mm2 = a|b|c|d | ||
|
||
" movq 8(%%esi),%%mm4\n" // mm4 = e|f|g|h | ||
|
||
// pré charger le buffer dst dans mm7 | ||
" movq (%%edi),%%mm7\n" // mm7 = dst[0]" | ||
|
||
// multiplier par le volume | ||
" pmullw %%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) | ||
|
||
" pmulhw %%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) | ||
" movq %%mm4,%%mm5\n" // mm5 = e|f|g|h | ||
|
||
" pmullw %%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) | ||
|
||
" pmulhw %%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) | ||
" movq %%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) | ||
|
||
" punpckhwd %%mm2,%%mm1\n" // mm1 = a*v|b*v | ||
|
||
" movq %%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) | ||
" punpcklwd %%mm2,%%mm3\n" // mm3 = c*v|d*v | ||
|
||
" punpckhwd %%mm5,%%mm4\n" // mm4 = e*f|f*v | ||
|
||
" punpcklwd %%mm5,%%mm6\n" // mm6 = g*v|h*v | ||
|
||
// pré charger le buffer dst dans mm5 | ||
" movq 8(%%edi),%%mm5\n" // mm5 = dst[1] | ||
|
||
// diviser par 128 | ||
" psrad $7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME | ||
" addl $16,%%esi\n" | ||
|
||
" psrad $7,%%mm3\n" // mm3 = c*v/128|d*v/128 | ||
|
||
" psrad $7,%%mm4\n" // mm4 = e*v/128|f*v/128 | ||
|
||
// mm1 = le sample avec le volume modifié | ||
" packssdw %%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v) | ||
|
||
" psrad $7,%%mm6\n" // mm6= g*v/128|h*v/128 | ||
" paddsw %%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst | ||
|
||
// mm4 = le sample avec le volume modifié | ||
" packssdw %%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v) | ||
" movq %%mm3,(%%edi)\n" | ||
|
||
" paddsw %%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst | ||
|
||
" movq %%mm6,8(%%edi)\n" | ||
|
||
" addl $16,%%edi\n" | ||
|
||
" dec %%ebx\n" | ||
|
||
" jnz .mixloopS16\n" | ||
|
||
" emms\n" | ||
|
||
".endS16:\n" | ||
: | ||
: "m" (dst), "m"(src),"m"(size), | ||
"m"(volume) | ||
: "eax","ebx", "esi", "edi","memory" | ||
); | ||
} | ||
|
||
|
||
|
||
//////////////////////////////////////////////// | ||
// Mixing for 8 bit signed buffers | ||
//////////////////////////////////////////////// | ||
|
||
void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume) | ||
{ | ||
__asm__ __volatile__ ( | ||
|
||
" movl %0,%%edi\n" // edi = dst | ||
" movl %1,%%esi\n" // esi = src | ||
" movl %3,%%eax\n" // eax = volume | ||
|
||
" movd %%ebx,%%mm0\n" | ||
" movq %%mm0,%%mm1\n" | ||
" psllq $16,%%mm0\n" | ||
" por %%mm1,%%mm0\n" | ||
" psllq $16,%%mm0\n" | ||
" por %%mm1,%%mm0\n" | ||
" psllq $16,%%mm0\n" | ||
" por %%mm1,%%mm0\n" | ||
|
||
" movl %2,%%ebx\n" // ebx = size | ||
" shr $3,%%ebx\n" // process 8 bytes per iteration = 8 samples | ||
|
||
" cmp $0,%%ebx\n" | ||
" je .endS8\n" | ||
|
||
".align 16\n" | ||
" .mixloopS8:\n" | ||
|
||
" pxor %%mm2,%%mm2\n" // mm2 = 0 | ||
" movq (%%esi),%%mm1\n" // mm1 = a|b|c|d|e|f|g|h | ||
|
||
" movq %%mm1,%%mm3\n" // mm3 = a|b|c|d|e|f|g|h | ||
|
||
// on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 | ||
" pcmpgtb %%mm1,%%mm2\n" // mm2 = 11111111|00000000|00000000.... | ||
|
||
" punpckhbw %%mm2,%%mm1\n" // mm1 = 0|a|0|b|0|c|0|d | ||
|
||
" punpcklbw %%mm2,%%mm3\n" // mm3 = 0|e|0|f|0|g|0|h | ||
" movq (%%edi),%%mm2\n" // mm2 = destination | ||
|
||
" pmullw %%mm0,%%mm1\n" // mm1 = v*a|v*b|v*c|v*d | ||
" addl $8,%%esi\n" | ||
|
||
" pmullw %%mm0,%%mm3\n" // mm3 = v*e|v*f|v*g|v*h | ||
" psraw $7,%%mm1\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128 | ||
|
||
" psraw $7,%%mm3\n" // mm3 = v*e/128|v*f/128|v*g/128|v*h/128 | ||
|
||
" packsswb %%mm1,%%mm3\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128 | ||
|
||
" paddsb %%mm2,%%mm3\n" // add to destination buffer | ||
|
||
" movq %%mm3,(%%edi)\n" // store back to ram | ||
" addl $8,%%edi\n" | ||
|
||
" dec %%ebx\n" | ||
|
||
" jnz .mixloopS8\n" | ||
|
||
".endS8:\n" | ||
" emms\n" | ||
: | ||
: "m" (dst), "m"(src),"m"(size), | ||
"m"(volume) | ||
: "eax","ebx", "esi", "edi","memory" | ||
); | ||
} | ||
#endif | ||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,13 @@ | ||
// headers for MMX assembler version of SDL_MixAudio | ||
// Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) | ||
// This code is licensed under the LGPL (see COPYING for details) | ||
// | ||
// Assumes buffer size in bytes is a multiple of 16 | ||
// Assumes SDL_MIX_MAXVOLUME = 128 | ||
|
||
|
||
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) | ||
void SDL_MixAudio_MMX_S16(char* ,char* ,unsigned int ,int ); | ||
void SDL_MixAudio_MMX_S8(char* ,char* ,unsigned int ,int ); | ||
#endif | ||
|