annotate src/video/riscos/SDL_riscosASM.s @ 1035:974ba6ae0fa3

Date: Wed, 26 Jan 2005 13:37:09 GMT From: Peter Naulls Subject: RISC OS SDL Patches Sam, I've attached a diff of the latest changes to libSDL for RISC OS support. These changes are by Alan Buckley and myself. The most significant of these are: Optimised assembler blit rountines - I've attached the file src/video/riscos/SDL_riscosASM.s which is needed for this. Move to using /dev/dsp instead of its own audio implementation. This means that src/audio/riscos/SDL_drenderer.c should be removed Typo fixes. Mainly correct spelling of "RISC OS", but some from elsewhere too.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2005 18:01:31 +0000
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children 7eeb3324d37d
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1035
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1 Date: Wed, 26 Jan 2005 13:37:09 GMT
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2 From: Peter Naulls <peter@chocky.org>
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3 To: slouken@libsdl.org
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4 Subject: RISC OS SDL Patches
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5
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6 ;
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7 ; SDL - Simple DirectMedia Layer
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8 ; Copyright (C) 1997-2004 Sam Lantinga
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9 ;
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10 ; This library is free software; you can redistribute it and/or
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11 ; modify it under the terms of the GNU Library General Public
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12 ; License as published by the Free Software Foundation; either
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13 ; version 2 of the License, or (at your option) any later version.
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14 ;
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15 ; This library is distributed in the hope that it will be useful,
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16 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ; Library General Public License for more details.
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19 ;
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20 ; You should have received a copy of the GNU Library General Public
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21 ; License along with this library; if not, write to the Free
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22 ; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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23 ;
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24 ; Sam Lantinga
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25 ; slouken@devolution.com
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26 ;
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27 ; Assembler routines for RISC OS display
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28 ;
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29
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30 AREA |C$$CODE|
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31
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32 EXPORT |RISCOS_Put32|
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33
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34 ; Display 32bpp to 32bpp, 1:1
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35 ;
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36 ; Code provided by Adrain Lees
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37 ;
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38 ; entry a1 -> destination
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39 ; a2 = dest width in pixels
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40 ; a3 = dest line length in bytes
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41 ; a4 = dest height in scanlines
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42 ; arg5 -> source
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43 ; arg6 = byte offset from end of source line to start of next
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44
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45 Arg5 * 10*4
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46 Arg6 * Arg5+4
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47
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48 RISCOS_Put32 ROUT
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49 STMFD sp!,{a2,v1-v6,sl,fp,lr}
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50 LDR ip,[sp,#Arg5]
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51 MOV lr,a1
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52 B ucp64lp
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53
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54 00 ;tail strip of 1-15 pixels
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55
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56 LDR v1,[ip],#4
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57 01 SUBS a2,a2,#1
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58 STR v1,[lr],#4
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59 LDRHI v1,[ip],#4
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60 BHI %01
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61 B %02
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62
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63 ucp64end ADDS a2,a2,#16
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64 BNE %00
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65
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66 02 SUBS a4,a4,#1 ;height--
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67 LDRHI v1,[sp,#Arg6]
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68 LDRHI a2,[sp] ;reload width
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69 BLS %03
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70
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71 ;move to start of next scanline
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72
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73 ADD lr,a1,a3
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74 ADD a1,a1,a3
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75 ADD ip,ip,v1
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76
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77 ucp64lp SUBS a2,a2,#16
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78 BLO ucp64end
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79
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80 PLD [ip,#64]
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81
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82 LDR v1,[ip],#4
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83 LDR v2,[ip],#4
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84 LDR v3,[ip],#4
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85 LDR v4,[ip],#4
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86 LDR v5,[ip],#4
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87 LDR v6,[ip],#4
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88 LDR sl,[ip],#4
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89 LDR fp,[ip],#4
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90 STR v1,[lr],#4
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91 STR v2,[lr],#4
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92 STR v3,[lr],#4
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93 STR v4,[lr],#4
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94 STR v5,[lr],#4
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95 STR v6,[lr],#4
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96 STR sl,[lr],#4
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97 STR fp,[lr],#4
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98
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99 PLD [ip,#64]
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100
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101 LDR v1,[ip],#4
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102 LDR v2,[ip],#4
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103 LDR v3,[ip],#4
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104 LDR v4,[ip],#4
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105 LDR v5,[ip],#4
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106 LDR v6,[ip],#4
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107 LDR sl,[ip],#4
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108 LDR fp,[ip],#4
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109 STR v1,[lr],#4
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110 STR v2,[lr],#4
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111 STR v3,[lr],#4
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112 STR v4,[lr],#4
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113 STR v5,[lr],#4
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114 STR v6,[lr],#4
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115 STR sl,[lr],#4
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116 STR fp,[lr],#4
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117
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118 B ucp64lp
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119
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120 03 LDMFD sp!,{a2,v1-v6,sl,fp,pc}
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121