annotate src/video/SDL_stretch.c @ 937:1e6366bde299

Date: Tue, 27 Jul 2004 17:14:00 +0200 From: "Eckhard Stolberg" Subject: Controller names in SDL for Windows I'm working on an Atari 2600 emulator for different systems that uses the SDL. Some time ago someone created an adaptor that lets you use your old Atari controllers with your computer through the USB port. Some of the Atari controllers require special handling by the emulator, so it would be nice, if it would be possible to detect if any of the controllers connected to the computer is this adaptor. SDL would allow that with the SDL_JoystickName function, but unfortunately it doesn't work properly on Windows. On Linux and MacOSX this function returns the name of the controller, but on Windows you'll only get the name of the joystick driver. Most joysticks nowadays use the generic Microsoft driver, so they all return the same name. In an old MSDN article (http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarinput/html/msdn_extdirect.asp) Microsoft describes how to read out the OEM controller names from the registry. I have implemented this for the SDL controller handler on Windows, and now reading the joystick name works properly there too.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Aug 2004 03:45:58 +0000
parents 1d1a823904d8
children 10b3fb28c86b
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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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This a stretch blit implementation based on ideas given to me by
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29 Tomasz Cejner - thanks! :)
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30
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31 April 27, 2000 - Sam Lantinga
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32 */
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33
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34 #include "SDL_error.h"
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35 #include "SDL_video.h"
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36 #include "SDL_blit.h"
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37
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38 /* This isn't ready for general consumption yet - it should be folded
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39 into the general blitting mechanism.
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40 */
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41
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42 #if (defined(WIN32) && !defined(_M_ALPHA) && !defined(_WIN32_WCE) && \
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43 !defined(__WATCOMC__) && !defined(__LCC__) && !defined(__FREEBCC__)) || \
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44 (defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT))
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45 #define USE_ASM_STRETCH
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46 #endif
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47
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48 #ifdef USE_ASM_STRETCH
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49
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50 #if defined(WIN32) || defined(i386)
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51 #define PREFIX16 0x66
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52 #define STORE_BYTE 0xAA
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53 #define STORE_WORD 0xAB
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54 #define LOAD_BYTE 0xAC
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55 #define LOAD_WORD 0xAD
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56 #define RETURN 0xC3
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57 #else
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58 #error Need assembly opcodes for this architecture
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59 #endif
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60
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61 #if defined(__ELF__) && defined(__GNUC__)
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62 extern unsigned char _copy_row[4096] __attribute__ ((alias ("copy_row")));
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63 #endif
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64 static unsigned char copy_row[4096];
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65
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66 static int generate_rowbytes(int src_w, int dst_w, int bpp)
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67 {
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68 static struct {
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69 int bpp;
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70 int src_w;
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71 int dst_w;
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72 } last;
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73
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74 int i;
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75 int pos, inc;
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76 unsigned char *eip;
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77 unsigned char load, store;
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78
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79 /* See if we need to regenerate the copy buffer */
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80 if ( (src_w == last.src_w) &&
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81 (dst_w == last.src_w) && (bpp == last.bpp) ) {
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82 return(0);
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83 }
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84 last.bpp = bpp;
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85 last.src_w = src_w;
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86 last.dst_w = dst_w;
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87
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88 switch (bpp) {
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89 case 1:
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90 load = LOAD_BYTE;
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91 store = STORE_BYTE;
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92 break;
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93 case 2:
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94 case 4:
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95 load = LOAD_WORD;
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96 store = STORE_WORD;
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97 break;
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98 default:
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99 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
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100 return(-1);
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101 }
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102 pos = 0x10000;
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103 inc = (src_w << 16) / dst_w;
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104 eip = copy_row;
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105 for ( i=0; i<dst_w; ++i ) {
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106 while ( pos >= 0x10000L ) {
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107 if ( bpp == 2 ) {
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108 *eip++ = PREFIX16;
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109 }
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110 *eip++ = load;
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111 pos -= 0x10000L;
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112 }
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113 if ( bpp == 2 ) {
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114 *eip++ = PREFIX16;
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115 }
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116 *eip++ = store;
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117 pos += inc;
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118 }
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119 *eip++ = RETURN;
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120
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121 /* Verify that we didn't overflow (too late) */
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122 if ( eip > (copy_row+sizeof(copy_row)) ) {
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123 SDL_SetError("Copy buffer overflow");
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124 return(-1);
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125 }
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126 return(0);
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127 }
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128
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129 #else
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130
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131 #define DEFINE_COPY_ROW(name, type) \
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132 void name(type *src, int src_w, type *dst, int dst_w) \
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133 { \
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134 int i; \
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135 int pos, inc; \
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136 type pixel = 0; \
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137 \
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138 pos = 0x10000; \
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139 inc = (src_w << 16) / dst_w; \
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140 for ( i=dst_w; i>0; --i ) { \
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141 while ( pos >= 0x10000L ) { \
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142 pixel = *src++; \
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143 pos -= 0x10000L; \
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144 } \
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145 *dst++ = pixel; \
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146 pos += inc; \
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147 } \
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148 }
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149 DEFINE_COPY_ROW(copy_row1, Uint8)
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150 DEFINE_COPY_ROW(copy_row2, Uint16)
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151 DEFINE_COPY_ROW(copy_row4, Uint32)
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152
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153 #endif /* USE_ASM_STRETCH */
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154
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155 /* The ASM code doesn't handle 24-bpp stretch blits */
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156 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
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157 {
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158 int i;
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159 int pos, inc;
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160 Uint8 pixel[3];
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161
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162 pos = 0x10000;
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163 inc = (src_w << 16) / dst_w;
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164 for ( i=dst_w; i>0; --i ) {
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diff changeset
165 while ( pos >= 0x10000L ) {
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diff changeset
166 pixel[0] = *src++;
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parents:
diff changeset
167 pixel[1] = *src++;
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diff changeset
168 pixel[2] = *src++;
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parents:
diff changeset
169 pos -= 0x10000L;
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parents:
diff changeset
170 }
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diff changeset
171 *dst++ = pixel[0];
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parents:
diff changeset
172 *dst++ = pixel[1];
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parents:
diff changeset
173 *dst++ = pixel[2];
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parents:
diff changeset
174 pos += inc;
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parents:
diff changeset
175 }
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parents:
diff changeset
176 }
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diff changeset
177
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178 /* Perform a stretch blit between two surfaces of the same format.
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parents:
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179 NOTE: This function is not safe to call from multiple threads!
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180 */
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181 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
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182 SDL_Surface *dst, SDL_Rect *dstrect)
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183 {
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184 int src_locked;
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185 int dst_locked;
0
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186 int pos, inc;
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187 int dst_width;
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188 int dst_maxrow;
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parents:
diff changeset
189 int src_row, dst_row;
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diff changeset
190 Uint8 *srcp = NULL;
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191 Uint8 *dstp;
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192 SDL_Rect full_src;
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193 SDL_Rect full_dst;
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194 #if defined(USE_ASM_STRETCH) && defined(__GNUC__)
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195 int u1, u2;
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196 #endif
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197 const int bpp = dst->format->BytesPerPixel;
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198
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199 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) {
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200 SDL_SetError("Only works with same format surfaces");
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201 return(-1);
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202 }
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203
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parents:
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204 /* Verify the blit rectangles */
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parents:
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205 if ( srcrect ) {
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206 if ( (srcrect->x < 0) || (srcrect->y < 0) ||
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207 ((srcrect->x+srcrect->w) > src->w) ||
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208 ((srcrect->y+srcrect->h) > src->h) ) {
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209 SDL_SetError("Invalid source blit rectangle");
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210 return(-1);
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parents:
diff changeset
211 }
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212 } else {
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213 full_src.x = 0;
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diff changeset
214 full_src.y = 0;
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diff changeset
215 full_src.w = src->w;
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diff changeset
216 full_src.h = src->h;
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parents:
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217 srcrect = &full_src;
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parents:
diff changeset
218 }
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parents:
diff changeset
219 if ( dstrect ) {
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parents:
diff changeset
220 if ( (dstrect->x < 0) || (dstrect->y < 0) ||
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parents:
diff changeset
221 ((dstrect->x+dstrect->w) > dst->w) ||
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parents:
diff changeset
222 ((dstrect->y+dstrect->h) > dst->h) ) {
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parents:
diff changeset
223 SDL_SetError("Invalid destination blit rectangle");
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diff changeset
224 return(-1);
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parents:
diff changeset
225 }
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parents:
diff changeset
226 } else {
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diff changeset
227 full_dst.x = 0;
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diff changeset
228 full_dst.y = 0;
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diff changeset
229 full_dst.w = dst->w;
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diff changeset
230 full_dst.h = dst->h;
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diff changeset
231 dstrect = &full_dst;
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parents:
diff changeset
232 }
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diff changeset
233
894
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234 /* Lock the destination if it's in hardware */
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235 dst_locked = 0;
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236 if ( SDL_MUSTLOCK(dst) ) {
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237 if ( SDL_LockSurface(dst) < 0 ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
238 SDL_SetError("Unable to lock destination surface");
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diff changeset
239 return(-1);
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diff changeset
240 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
241 dst_locked = 1;
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diff changeset
242 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
243 /* Lock the source if it's in hardware */
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
244 src_locked = 0;
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diff changeset
245 if ( SDL_MUSTLOCK(src) ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
246 if ( SDL_LockSurface(src) < 0 ) {
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parents: 769
diff changeset
247 if ( dst_locked ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
248 SDL_UnlockSurface(dst);
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parents: 769
diff changeset
249 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
250 SDL_SetError("Unable to lock source surface");
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
251 return(-1);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
252 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
253 src_locked = 1;
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
254 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
255
0
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parents:
diff changeset
256 /* Set up the data... */
74212992fb08 Initial revision
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parents:
diff changeset
257 pos = 0x10000;
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parents:
diff changeset
258 inc = (srcrect->h << 16) / dstrect->h;
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parents:
diff changeset
259 src_row = srcrect->y;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 dst_row = dstrect->y;
74212992fb08 Initial revision
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parents:
diff changeset
261 dst_width = dstrect->w*bpp;
74212992fb08 Initial revision
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parents:
diff changeset
262
74212992fb08 Initial revision
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parents:
diff changeset
263 #ifdef USE_ASM_STRETCH
74212992fb08 Initial revision
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parents:
diff changeset
264 /* Write the opcodes for this stretch */
74212992fb08 Initial revision
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parents:
diff changeset
265 if ( (bpp != 3) &&
74212992fb08 Initial revision
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parents:
diff changeset
266 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 #endif
74212992fb08 Initial revision
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parents:
diff changeset
270
74212992fb08 Initial revision
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parents:
diff changeset
271 /* Perform the stretch blit */
74212992fb08 Initial revision
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parents:
diff changeset
272 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 + (dstrect->x*bpp);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 while ( pos >= 0x10000L ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 srcp = (Uint8 *)src->pixels + (src_row*src->pitch)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 + (srcrect->x*bpp);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 ++src_row;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 pos -= 0x10000L;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 #ifdef USE_ASM_STRETCH
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 switch (bpp) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 #ifdef __GNUC__
627
8b9ac38381d0 Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
288 __asm__ __volatile__ (
8b9ac38381d0 Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
289 "call _copy_row"
0
74212992fb08 Initial revision
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parents:
diff changeset
290 : "=&D" (u1), "=&S" (u2)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 : "0" (dstp), "1" (srcp)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 : "memory" );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 #else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 #ifdef WIN32
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 { void *code = &copy_row;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 __asm {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 push edi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 push esi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 mov edi, dstp
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 mov esi, srcp
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 call dword ptr code
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 pop esi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 pop edi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 #else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 #error Need inline assembly for this compiler
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 #endif /* __GNUC__ */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 #else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 switch (bpp) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 case 2:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 copy_row2((Uint16 *)srcp, srcrect->w,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 (Uint16 *)dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326 case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 copy_row4((Uint32 *)srcp, srcrect->w,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 (Uint32 *)dstp, dstrect->w);
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329 break;
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330 }
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331 #endif
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332 pos += inc;
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333 }
894
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334
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335 /* We need to unlock the surfaces if they're locked */
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336 if ( dst_locked ) {
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337 SDL_UnlockSurface(dst);
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338 }
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339 if ( src_locked ) {
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340 SDL_UnlockSurface(src);
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341 }
0
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342 return(0);
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343 }
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344