Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer.c @ 5053:b5b42be9333c
Fixed bug #1026
Vittorio Giovara 2010-07-16 19:09:28 PDT
i was reading SDL_renderer_gles and i noticed that every time we there
is some gl call the gl state is modified with a couple of
glEnableClientState()/glDisableClientState.
While this is completely fine for desktops systems, this is a major
performace kill on mobile devices, right where opengles is
implemented.
Normal practice in this case is to update the glstate once, keep it
always the same and disable/enable other states only in very special
occasions.
On the web there's plenty of documentation (on the top of my head
http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5
) and i personally tried this.
I modified my code and got a 10 fps boost, then modified SDL_render_gles and
shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i
got an 80% performance increase with this technique.
I have attached a dif of my changes, hope that it will be included in
mainstream.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 19 Jan 2011 23:56:16 -0800 |
parents | f7b03b6838cb |
children | b530ef003506 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
3697 | 3 Copyright (C) 1997-2010 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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6 modify it under the terms of the GNU Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
1312
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 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 | |
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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13 Lesser General Public License for more details. |
0 | 14 |
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
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15 You should have received a copy of the GNU Lesser General Public |
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
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16 License along with this library; if not, write to the Free Software |
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
0 | 21 */ |
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Use consistent identifiers for the various platforms we support.
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22 #include "SDL_config.h" |
0 | 23 |
24 /* This provides the default mixing callback for the SDL audio routines */ | |
25 | |
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c71e05b4dc2e
More header massaging... works great on Windows. ;-)
Sam Lantinga <slouken@libsdl.org>
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26 #include "SDL_cpuinfo.h" |
0 | 27 #include "SDL_timer.h" |
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More header massaging... works great on Windows. ;-)
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parents:
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28 #include "SDL_audio.h" |
0 | 29 #include "SDL_sysaudio.h" |
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
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30 #include "SDL_mixer_MMX.h" |
574
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Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
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31 #include "SDL_mixer_MMX_VC.h" |
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
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32 #include "SDL_mixer_m68k.h" |
0 | 33 |
34 /* This table is used to add two sound values together and pin | |
35 * the value to avoid overflow. (used with permission from ARDI) | |
36 * Changed to use 0xFE instead of 0xFF for better sound quality. | |
37 */ | |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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38 static const Uint8 mix8[] = { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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39 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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40 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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41 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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51 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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52 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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53 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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54 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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55 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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56 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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57 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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58 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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59 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
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changeset
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60 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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61 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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62 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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63 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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64 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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65 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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66 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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67 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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68 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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69 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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70 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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71 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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72 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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73 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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74 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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75 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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76 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
|
77 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
|
78 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
|
79 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
|
80 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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81 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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82 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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83 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1442
diff
changeset
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84 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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85 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE |
0 | 86 }; |
87 | |
88 /* The volume ranges from 0 - 128 */ | |
89 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) | |
90 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) | |
91 | |
1982
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First shot at new audio data types (int32 and float32).
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92 |
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First shot at new audio data types (int32 and float32).
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93 void |
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First shot at new audio data types (int32 and float32).
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94 SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format, |
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First shot at new audio data types (int32 and float32).
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95 Uint32 len, int volume) |
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First shot at new audio data types (int32 and float32).
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96 { |
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First shot at new audio data types (int32 and float32).
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97 if (volume == 0) { |
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First shot at new audio data types (int32 and float32).
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98 return; |
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First shot at new audio data types (int32 and float32).
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99 } |
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First shot at new audio data types (int32 and float32).
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parents:
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100 |
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c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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101 switch (format) { |
0 | 102 |
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c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
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103 case AUDIO_U8: |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
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104 { |
3630
efb79807afe1
Merged r5194:5195 from branches/SDL-1.2: coldfire cpu arch support.
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changeset
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105 #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && defined(SDL_ASSEMBLY_ROUTINES) |
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106 SDL_MixAudio_m68k_U8((char *) dst, (char *) src, |
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107 (unsigned long) len, (long) volume, |
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108 (char *) mix8); |
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109 #else |
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110 Uint8 src_sample; |
0 | 111 |
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112 while (len--) { |
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113 src_sample = *src; |
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114 ADJUST_VOLUME_U8(src_sample, volume); |
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115 *dst = mix8[*dst + src_sample]; |
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116 ++dst; |
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117 ++src; |
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118 } |
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119 #endif |
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120 } |
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121 break; |
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123 case AUDIO_S8: |
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124 { |
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125 #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ |
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126 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) |
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127 if (SDL_HasMMX()) { |
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128 SDL_MixAudio_MMX_S8((char *) dst, (char *) src, |
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129 (unsigned int) len, (int) volume); |
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130 } else |
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131 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) |
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132 if (SDL_HasMMX()) { |
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133 SDL_MixAudio_MMX_S8_VC((char *) dst, (char *) src, |
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134 (unsigned int) len, (int) volume); |
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135 } else |
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136 #endif |
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137 #endif |
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138 #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && defined(SDL_ASSEMBLY_ROUTINES) |
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139 SDL_MixAudio_m68k_S8((char *) dst, (char *) src, |
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140 (unsigned long) len, (long) volume); |
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141 #else |
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142 { |
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143 Sint8 *dst8, *src8; |
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144 Sint8 src_sample; |
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145 int dst_sample; |
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146 const int max_audioval = ((1 << (8 - 1)) - 1); |
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147 const int min_audioval = -(1 << (8 - 1)); |
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149 src8 = (Sint8 *) src; |
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150 dst8 = (Sint8 *) dst; |
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151 while (len--) { |
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152 src_sample = *src8; |
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153 ADJUST_VOLUME(src_sample, volume); |
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154 dst_sample = *dst8 + src_sample; |
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155 if (dst_sample > max_audioval) { |
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156 *dst8 = max_audioval; |
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157 } else if (dst_sample < min_audioval) { |
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158 *dst8 = min_audioval; |
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159 } else { |
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160 *dst8 = dst_sample; |
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161 } |
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162 ++dst8; |
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163 ++src8; |
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164 } |
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165 } |
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166 #endif |
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167 } |
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168 break; |
0 | 169 |
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170 case AUDIO_S16LSB: |
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171 { |
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172 #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ |
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173 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) |
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174 if (SDL_HasMMX()) { |
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175 SDL_MixAudio_MMX_S16((char *) dst, (char *) src, |
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176 (unsigned int) len, (int) volume); |
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177 } else |
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178 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) |
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179 if (SDL_HasMMX()) { |
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180 SDL_MixAudio_MMX_S16_VC((char *) dst, (char *) src, |
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181 (unsigned int) len, (int) volume); |
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182 } else |
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183 #endif |
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184 #endif |
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185 #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && defined(SDL_ASSEMBLY_ROUTINES) |
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186 SDL_MixAudio_m68k_S16LSB((short *) dst, (short *) src, |
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187 (unsigned long) len, (long) volume); |
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188 #else |
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189 { |
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190 Sint16 src1, src2; |
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191 int dst_sample; |
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192 const int max_audioval = ((1 << (16 - 1)) - 1); |
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193 const int min_audioval = -(1 << (16 - 1)); |
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195 len /= 2; |
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196 while (len--) { |
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197 src1 = ((src[1]) << 8 | src[0]); |
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198 ADJUST_VOLUME(src1, volume); |
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199 src2 = ((dst[1]) << 8 | dst[0]); |
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200 src += 2; |
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201 dst_sample = src1 + src2; |
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202 if (dst_sample > max_audioval) { |
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203 dst_sample = max_audioval; |
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204 } else if (dst_sample < min_audioval) { |
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205 dst_sample = min_audioval; |
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206 } |
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207 dst[0] = dst_sample & 0xFF; |
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208 dst_sample >>= 8; |
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209 dst[1] = dst_sample & 0xFF; |
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210 dst += 2; |
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211 } |
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212 } |
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213 #endif |
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214 } |
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215 break; |
0 | 216 |
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217 case AUDIO_S16MSB: |
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218 { |
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219 #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && defined(SDL_ASSEMBLY_ROUTINES) |
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220 SDL_MixAudio_m68k_S16MSB((short *) dst, (short *) src, |
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221 (unsigned long) len, (long) volume); |
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222 #else |
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223 Sint16 src1, src2; |
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224 int dst_sample; |
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225 const int max_audioval = ((1 << (16 - 1)) - 1); |
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226 const int min_audioval = -(1 << (16 - 1)); |
0 | 227 |
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228 len /= 2; |
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229 while (len--) { |
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230 src1 = ((src[0]) << 8 | src[1]); |
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231 ADJUST_VOLUME(src1, volume); |
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232 src2 = ((dst[0]) << 8 | dst[1]); |
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233 src += 2; |
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234 dst_sample = src1 + src2; |
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235 if (dst_sample > max_audioval) { |
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236 dst_sample = max_audioval; |
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237 } else if (dst_sample < min_audioval) { |
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238 dst_sample = min_audioval; |
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239 } |
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240 dst[1] = dst_sample & 0xFF; |
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241 dst_sample >>= 8; |
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242 dst[0] = dst_sample & 0xFF; |
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243 dst += 2; |
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244 } |
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245 #endif |
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246 } |
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247 break; |
0 | 248 |
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249 case AUDIO_S32LSB: |
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250 { |
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251 const Uint32 *src32 = (Uint32 *) src; |
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252 Uint32 *dst32 = (Uint32 *) dst; |
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253 Sint64 src1, src2; |
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254 Sint64 dst_sample; |
1985
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255 const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); |
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256 const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); |
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257 |
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258 len /= 4; |
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259 while (len--) { |
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260 src1 = (Sint64) ((Sint32) SDL_SwapLE32(*src32)); |
1982
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261 src32++; |
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262 ADJUST_VOLUME(src1, volume); |
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263 src2 = (Sint64) ((Sint32) SDL_SwapLE32(*dst32)); |
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264 dst_sample = src1 + src2; |
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265 if (dst_sample > max_audioval) { |
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266 dst_sample = max_audioval; |
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267 } else if (dst_sample < min_audioval) { |
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268 dst_sample = min_audioval; |
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269 } |
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270 *(dst32++) = SDL_SwapLE32((Uint32) ((Sint32) dst_sample)); |
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271 } |
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272 } |
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273 break; |
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274 |
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275 case AUDIO_S32MSB: |
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276 { |
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277 const Uint32 *src32 = (Uint32 *) src; |
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278 Uint32 *dst32 = (Uint32 *) dst; |
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279 Sint64 src1, src2; |
1982
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280 Sint64 dst_sample; |
1985
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281 const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); |
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282 const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); |
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283 |
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284 len /= 4; |
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285 while (len--) { |
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286 src1 = (Sint64) ((Sint32) SDL_SwapBE32(*src32)); |
1982
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287 src32++; |
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288 ADJUST_VOLUME(src1, volume); |
2013
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289 src2 = (Sint64) ((Sint32) SDL_SwapBE32(*dst32)); |
1982
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290 dst_sample = src1 + src2; |
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291 if (dst_sample > max_audioval) { |
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292 dst_sample = max_audioval; |
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293 } else if (dst_sample < min_audioval) { |
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294 dst_sample = min_audioval; |
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295 } |
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296 *(dst32++) = SDL_SwapBE32((Uint32) ((Sint32) dst_sample)); |
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297 } |
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298 } |
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299 break; |
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300 |
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301 case AUDIO_F32LSB: |
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302 { |
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303 const float fmaxvolume = 1.0f / ((float) SDL_MIX_MAXVOLUME); |
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304 const float fvolume = (float) volume; |
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305 const float *src32 = (float *) src; |
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306 float *dst32 = (float *) dst; |
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307 float src1, src2; |
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308 double dst_sample; |
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309 /* !!! FIXME: are these right? */ |
2130
3ee59c43d784
Fixes for compiling with Visual C++ 8.0 Express Edition
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2049
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|
310 const double max_audioval = 3.402823466e+38F; |
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Fixes for compiling with Visual C++ 8.0 Express Edition
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|
311 const double min_audioval = -3.402823466e+38F; |
1982
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312 |
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313 len /= 4; |
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314 while (len--) { |
2014
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Replaced unions with calls to SDL_SwapFloat...
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2013
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315 src1 = ((SDL_SwapFloatLE(*src32) * fvolume) * fmaxvolume); |
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316 src2 = SDL_SwapFloatLE(*dst32); |
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317 src32++; |
1982
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318 |
2014
7abe37467fa5
Replaced unions with calls to SDL_SwapFloat...
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parents:
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|
319 dst_sample = ((double) src1) + ((double) src2); |
1982
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First shot at new audio data types (int32 and float32).
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|
320 if (dst_sample > max_audioval) { |
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|
321 dst_sample = max_audioval; |
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322 } else if (dst_sample < min_audioval) { |
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|
323 dst_sample = min_audioval; |
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324 } |
2014
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2013
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|
325 *(dst32++) = SDL_SwapFloatLE((float) dst_sample); |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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parents:
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326 } |
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327 } |
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328 break; |
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329 |
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330 case AUDIO_F32MSB: |
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331 { |
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332 const float fmaxvolume = 1.0f / ((float) SDL_MIX_MAXVOLUME); |
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333 const float fvolume = (float) volume; |
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334 const float *src32 = (float *) src; |
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335 float *dst32 = (float *) dst; |
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336 float src1, src2; |
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337 double dst_sample; |
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338 /* !!! FIXME: are these right? */ |
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339 const double max_audioval = 3.402823466e+38F; |
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340 const double min_audioval = -3.402823466e+38F; |
1982
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341 |
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342 len /= 4; |
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343 while (len--) { |
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344 src1 = ((SDL_SwapFloatBE(*src32) * fvolume) * fmaxvolume); |
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345 src2 = SDL_SwapFloatBE(*dst32); |
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346 src32++; |
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347 |
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348 dst_sample = ((double) src1) + ((double) src2); |
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349 if (dst_sample > max_audioval) { |
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350 dst_sample = max_audioval; |
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351 } else if (dst_sample < min_audioval) { |
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352 dst_sample = min_audioval; |
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353 } |
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354 *(dst32++) = SDL_SwapFloatBE((float) dst_sample); |
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355 } |
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356 } |
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357 break; |
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358 |
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359 default: /* If this happens... FIXME! */ |
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360 SDL_SetError("SDL_MixAudio(): unknown audio format"); |
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361 return; |
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362 } |
0 | 363 } |
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364 |
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365 /* vi: set ts=4 sw=4 expandtab: */ |