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annotate src/audio/SDL_mixer_m68k.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents d910939febfa
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 m68k assembly mix routines
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26
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27 Patrice Mandin
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28 */
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29
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30 #if defined(__M68000__) && defined(__GNUC__)
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31 void
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32 SDL_MixAudio_m68k_U8 (char *dst, char *src, long len, long volume, char *mix8)
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33 {
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34 __asm__ __volatile__ ("tstl %2\n" " beqs stoploop_u8\n" "mixloop_u8:\n"
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35 /* Mix a sample */
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36 " moveq #0,%%d0\n" " moveq #0,%%d1\n" " moveb %1@+,%%d0\n" /* d0 = *src++ */
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37 " sub #128,%%d0\n" /* d0 -= 128 */
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38 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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39 " moveb %0@,%%d1\n" /* d1 = *dst */
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40 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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41 " add #128,%%d0\n" /* d0 += 128 */
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42 " add %%d1,%%d0\n"
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43 " moveb %4@(%%d0:w),%0@+\n"
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44 /* Loop till done */
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45 " subql #1,%2\n" " bhis mixloop_u8\n" "stoploop_u8:\n": /* no return value */
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46 : /* input */
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47 "a" (dst), "a" (src), "d" (len), "d" (volume), "a" (mix8): /* clobbered registers */
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48 "d0", "d1", "cc", "memory");
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49 }
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50
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51 void
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52 SDL_MixAudio_m68k_S8 (char *dst, char *src, long len, long volume)
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53 {
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54 __asm__ __volatile__ ("tstl %2\n"
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55 " beqs stoploop_s8\n"
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56 " moveq #-128,%%d2\n"
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57 " moveq #127,%%d3\n" "mixloop_s8:\n"
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58 /* Mix a sample */
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59 " moveq #0,%%d0\n" " moveq #0,%%d1\n" " moveb %1@+,%%d0\n" /* d0 = *src++ */
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60 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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61 " moveb %0@,%%d1\n" /* d1 = *dst */
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62 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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63 " add %%d1,%%d0\n"
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64 " cmp %%d2,%%d0\n"
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65 " bges lower_limit_s8\n"
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66 " move %%d2,%%d0\n"
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67 "lower_limit_s8:\n"
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68 " cmp %%d3,%%d0\n"
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69 " bles upper_limit_s8\n"
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70 " move %%d3,%%d0\n"
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71 "upper_limit_s8:\n" " moveb %%d0,%0@+\n"
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72 /* Loop till done */
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73 " subql #1,%2\n" " bhis mixloop_s8\n" "stoploop_s8:\n": /* no return value */
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74 : /* input */
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75 "a" (dst), "a" (src), "d" (len), "d" (volume): /* clobbered registers */
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76 "d0", "d1", "d2", "d3", "cc", "memory");
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77 }
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78
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79 void
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80 SDL_MixAudio_m68k_S16MSB (short *dst, short *src, long len, long volume)
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81 {
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82 __asm__ __volatile__ ("tstl %2\n"
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83 " beqs stoploop_s16msb\n"
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84 " movel #-32768,%%d2\n"
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85 " movel #32767,%%d3\n"
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86 " lsrl #1,%2\n" "mixloop_s16msb:\n"
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87 /* Mix a sample */
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88 " move %1@+,%%d0\n" /* d0 = *src++ */
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89 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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90 " move %0@,%%d1\n" /* d1 = *dst */
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91 " extl %%d1\n" /* extend d1 to 32 bits */
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92 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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93 " addl %%d1,%%d0\n"
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94 " cmpl %%d2,%%d0\n"
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95 " bges lower_limit_s16msb\n"
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96 " move %%d2,%%d0\n"
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97 "lower_limit_s16msb:\n"
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98 " cmpl %%d3,%%d0\n"
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99 " bles upper_limit_s16msb\n"
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100 " move %%d3,%%d0\n"
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101 "upper_limit_s16msb:\n" " move %%d0,%0@+\n"
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102 /* Loop till done */
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103 " subql #1,%2\n" " bhis mixloop_s16msb\n" "stoploop_s16msb:\n": /* no return value */
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104 : /* input */
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105 "a" (dst), "a" (src), "d" (len), "d" (volume): /* clobbered registers */
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106 "d0", "d1", "d2", "d3", "cc", "memory");
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107 }
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108
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109 void
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110 SDL_MixAudio_m68k_S16LSB (short *dst, short *src, long len, long volume)
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111 {
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112 __asm__ __volatile__ ("tstl %2\n"
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113 " beqs stoploop_s16lsb\n"
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114 " movel #-32768,%%d2\n"
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115 " movel #32767,%%d3\n"
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116 " lsrl #1,%2\n" "mixloop_s16lsb:\n"
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117 /* Mix a sample */
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118 " move %1@+,%%d0\n" /* d0 = *src++ */
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119 " rorw #8,%%d0\n" " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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120 " move %0@,%%d1\n" /* d1 = *dst */
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121 " rorw #8,%%d1\n" " extl %%d1\n" /* extend d1 to 32 bits */
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122 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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123 " addl %%d1,%%d0\n"
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124 " cmpl %%d2,%%d0\n"
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125 " bges lower_limit_s16lsb\n"
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126 " move %%d2,%%d0\n"
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127 "lower_limit_s16lsb:\n"
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128 " cmpl %%d3,%%d0\n"
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129 " bles upper_limit_s16lsb\n"
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130 " move %%d3,%%d0\n"
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131 "upper_limit_s16lsb:\n"
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132 " rorw #8,%%d0\n" " move %%d0,%0@+\n"
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133 /* Loop till done */
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134 " subql #1,%2\n" " bhis mixloop_s16lsb\n" "stoploop_s16lsb:\n": /* no return value */
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135 : /* input */
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136 "a" (dst), "a" (src), "d" (len), "d" (volume): /* clobbered registers */
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137 "d0", "d1", "d2", "d3", "cc", "memory");
633
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138 }
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139 #endif
1662
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140 /* vi: set ts=4 sw=4 expandtab: */