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annotate src/video/riscos/SDL_riscosASM.S @ 1555:780fd5b61df1

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Fixed bug #89 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:05:16 +0000
parents 1e8582152d44
children 99210400e8b9
rev   line source
1459
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1 ;
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2 ; SDL - Simple DirectMedia Layer
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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 ; Assembler routines for RISC OS display
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23 ;
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24
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25 AREA |C$$CODE|
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26
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27 EXPORT |RISCOS_Put32|
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28
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29 ; Display 32bpp to 32bpp, 1:1
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30 ;
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31 ; Code provided by Adrain Lees
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32 ;
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33 ; entry a1 -> destination
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34 ; a2 = dest width in pixels
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35 ; a3 = dest line length in bytes
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36 ; a4 = dest height in scanlines
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37 ; arg5 -> source
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38 ; arg6 = byte offset from end of source line to start of next
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39
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40 Arg5 * 10*4
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41 Arg6 * Arg5+4
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42
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43 RISCOS_Put32 ROUT
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44 STMFD sp!,{a2,v1-v6,sl,fp,lr}
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45 LDR ip,[sp,#Arg5]
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46 MOV lr,a1
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47 B ucp64lp
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48
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49 00 ;tail strip of 1-15 pixels
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50
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51 LDR v1,[ip],#4
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52 01 SUBS a2,a2,#1
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53 STR v1,[lr],#4
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54 LDRHI v1,[ip],#4
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55 BHI %01
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56 B %02
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57
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58 ucp64end ADDS a2,a2,#16
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59 BNE %00
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60
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61 02 SUBS a4,a4,#1 ;height--
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62 LDRHI v1,[sp,#Arg6]
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63 LDRHI a2,[sp] ;reload width
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64 BLS %03
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65
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66 ;move to start of next scanline
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67
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68 ADD lr,a1,a3
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69 ADD a1,a1,a3
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70 ADD ip,ip,v1
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71
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72 ucp64lp SUBS a2,a2,#16
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73 BLO ucp64end
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74
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75 PLD [ip,#64]
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76
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77 LDR v1,[ip],#4
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78 LDR v2,[ip],#4
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79 LDR v3,[ip],#4
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80 LDR v4,[ip],#4
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81 LDR v5,[ip],#4
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82 LDR v6,[ip],#4
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83 LDR sl,[ip],#4
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84 LDR fp,[ip],#4
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85 STR v1,[lr],#4
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86 STR v2,[lr],#4
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87 STR v3,[lr],#4
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88 STR v4,[lr],#4
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89 STR v5,[lr],#4
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90 STR v6,[lr],#4
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91 STR sl,[lr],#4
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92 STR fp,[lr],#4
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93
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94 PLD [ip,#64]
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95
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96 LDR v1,[ip],#4
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97 LDR v2,[ip],#4
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98 LDR v3,[ip],#4
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99 LDR v4,[ip],#4
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100 LDR v5,[ip],#4
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101 LDR v6,[ip],#4
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102 LDR sl,[ip],#4
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103 LDR fp,[ip],#4
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104 STR v1,[lr],#4
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105 STR v2,[lr],#4
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106 STR v3,[lr],#4
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107 STR v4,[lr],#4
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108 STR v5,[lr],#4
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109 STR v6,[lr],#4
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110 STR sl,[lr],#4
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111 STR fp,[lr],#4
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112
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113 B ucp64lp
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114
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115 03 LDMFD sp!,{a2,v1-v6,sl,fp,pc}
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116