e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | This library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | #include "SDL_mixer_MMX_VC.h" |
25 | |
26 | #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ |
27 | #if ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) |
28 | // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples |
29 | // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) |
30 | // Converted to Intel ASM notation by Cth |
31 | // This code is licensed under the LGPL (see COPYING for details) |
32 | // |
33 | // Assumes buffer size in bytes is a multiple of 16 |
34 | // Assumes SDL_MIX_MAXVOLUME = 128 |
35 | |
36 | |
37 | //////////////////////////////////////////////// |
38 | // Mixing for 16 bit signed buffers |
39 | //////////////////////////////////////////////// |
40 | |
41 | void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume) |
42 | { |
43 | __asm |
44 | { |
45 | |
46 | push edi |
47 | push esi |
48 | push ebx |
49 | |
50 | mov edi, dst // edi = dst |
51 | mov esi, src // esi = src |
52 | mov eax, volume // eax = volume |
53 | mov ebx, nSize // ebx = size |
54 | shr ebx, 4 // process 16 bytes per iteration = 8 samples |
55 | jz endS16 |
56 | |
57 | pxor mm0, mm0 |
58 | movd mm0, eax //%%eax,%%mm0 |
59 | movq mm1, mm0 //%%mm0,%%mm1 |
60 | psllq mm0, 16 //$16,%%mm0 |
61 | por mm0, mm1 //%%mm1,%%mm0 |
62 | psllq mm0, 16 //$16,%%mm0 |
63 | por mm0, mm1 //%%mm1,%%mm0 |
64 | psllq mm0, 16 //$16,%%mm0 |
65 | por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol |
66 | |
67 | #ifndef __WATCOMC__ |
68 | align 16 |
69 | #endif |
70 | mixloopS16: |
71 | movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d |
72 | movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d |
73 | movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h |
74 | // pre charger le buffer dst dans mm7 |
75 | movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]" |
76 | // multiplier par le volume |
77 | pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) |
78 | pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) |
79 | movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h |
80 | pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) |
81 | pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) |
82 | movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) |
83 | punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v |
84 | movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) |
85 | punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v |
86 | punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v |
87 | punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v |
88 | // pre charger le buffer dst dans mm5 |
89 | movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1] |
90 | // diviser par 128 |
91 | psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME |
92 | add esi, 16 //$16,%%esi\n" |
93 | psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128 |
94 | psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128 |
95 | // mm1 = le sample avec le volume modifie |
96 | packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v) |
97 | psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128 |
98 | paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst |
99 | // mm4 = le sample avec le volume modifie |
100 | packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v) |
101 | movq [edi], mm3 //%%mm3,(%%edi)\n" |
102 | paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst |
103 | movq [edi + 8], mm6 //%%mm6,8(%%edi)\n" |
104 | add edi, 16 //$16,%%edi\n" |
105 | dec ebx //%%ebx\n" |
106 | jnz mixloopS16 |
107 | |
108 | endS16: |
109 | emms |
110 | |
111 | pop ebx |
112 | pop esi |
113 | pop edi |
114 | } |
115 | |
116 | } |
117 | |
118 | //////////////////////////////////////////////// |
119 | // Mixing for 8 bit signed buffers |
120 | //////////////////////////////////////////////// |
121 | |
122 | void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume) |
123 | { |
124 | _asm |
125 | { |
126 | |
127 | push edi |
128 | push esi |
129 | push ebx |
130 | |
131 | mov edi, dst //movl %0,%%edi // edi = dst |
132 | mov esi, src //%1,%%esi // esi = src |
133 | mov eax, volume //%3,%%eax // eax = volume |
134 | |
135 | movd mm0, eax //%%eax,%%mm0 |
136 | movq mm1, mm0 //%%mm0,%%mm1 |
137 | psllq mm0, 16 //$16,%%mm0 |
138 | por mm0, mm1 //%%mm1,%%mm0 |
139 | psllq mm0, 16 //$16,%%mm0 |
140 | por mm0, mm1 //%%mm1,%%mm0 |
141 | psllq mm0, 16 //$16,%%mm0 |
142 | por mm0, mm1 //%%mm1,%%mm0 |
143 | |
144 | mov ebx, nSize //%2,%%ebx // ebx = size |
145 | shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples |
146 | cmp ebx, 0 //$0,%%ebx |
147 | je endS8 |
148 | |
149 | #ifndef __WATCOMC__ |
150 | align 16 |
151 | #endif |
152 | mixloopS8: |
153 | pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0 |
154 | movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h |
155 | movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h |
156 | // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 |
157 | pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000.... |
158 | punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d |
159 | punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h |
160 | movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination |
161 | pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d |
162 | add esi, 8 //$8,%%esi |
163 | pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h |
164 | psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128 |
165 | psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128 |
166 | packsswb mm3, mm1 //%%mm1,%%mm3 // 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 |
167 | paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer |
168 | movq [edi], mm3 //%%mm3,(%%edi) // store back to ram |
169 | add edi, 8 //$8,%%edi |
170 | dec ebx //%%ebx |
171 | jnz mixloopS8 |
172 | |
173 | endS8: |
174 | emms |
175 | |
176 | pop ebx |
177 | pop esi |
178 | pop edi |
179 | } |
180 | } |
181 | |
182 | #endif /* SDL_ASSEMBLY_ROUTINES */ |
183 | #endif /* SDL_BUGGY_MMX_MIXERS */ |