Mercurial > sdl-ios-xcode
annotate src/SDL_error.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> |
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date | Wed, 19 Jan 2011 23:56:16 -0800 |
parents | b12d76ef05e2 |
children | 2ee8112bfc6b |
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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6 modify it under the terms of the GNU Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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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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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
252
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Simple error handling in SDL */ | |
25 | |
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26 #ifdef __ANDROID__ |
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27 #include <android/log.h> |
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28 #endif |
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29 |
0 | 30 #include "SDL_error.h" |
31 #include "SDL_error_c.h" | |
32 | |
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33 /*#define DEBUG_ERROR*/ |
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34 |
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35 /* Routine to get the thread-specific error variable */ |
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36 #if SDL_THREADS_DISABLED |
4627 | 37 /* The default (non-thread-safe) global error variable */ |
0 | 38 static SDL_error SDL_global_error; |
39 #define SDL_GetErrBuf() (&SDL_global_error) | |
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40 #else |
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41 extern SDL_error *SDL_GetErrBuf(void); |
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42 #endif /* SDL_THREADS_DISABLED */ |
0 | 43 |
44 #define SDL_ERRBUFIZE 1024 | |
45 | |
46 /* Private functions */ | |
47 | |
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48 static const char * |
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49 SDL_LookupString(const char *key) |
0 | 50 { |
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51 /* FIXME: Add code to lookup key in language string hash-table */ |
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52 return key; |
0 | 53 } |
54 | |
55 /* Public functions */ | |
56 | |
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57 void |
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58 SDL_SetError(const char *fmt, ...) |
0 | 59 { |
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60 va_list ap; |
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61 SDL_error *error; |
0 | 62 |
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63 /* Copy in the key, mark error as valid */ |
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64 error = SDL_GetErrBuf(); |
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65 error->error = 1; |
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66 SDL_strlcpy((char *) error->key, fmt, sizeof(error->key)); |
0 | 67 |
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68 va_start(ap, fmt); |
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69 error->argc = 0; |
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70 while (*fmt) { |
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71 if (*fmt++ == '%') { |
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72 while (*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) { |
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73 ++fmt; |
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74 } |
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75 switch (*fmt++) { |
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76 case 0: /* Malformed format string.. */ |
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77 --fmt; |
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78 break; |
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79 case 'c': |
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80 case 'i': |
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81 case 'd': |
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82 case 'u': |
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83 case 'o': |
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84 case 'x': |
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85 case 'X': |
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86 error->args[error->argc++].value_i = va_arg(ap, int); |
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87 break; |
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88 case 'f': |
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89 error->args[error->argc++].value_f = va_arg(ap, double); |
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90 break; |
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91 case 'p': |
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92 error->args[error->argc++].value_ptr = va_arg(ap, void *); |
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93 break; |
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94 case 's': |
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95 { |
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96 int i = error->argc; |
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97 const char *str = va_arg(ap, const char *); |
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98 if (str == NULL) |
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99 str = "(null)"; |
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100 SDL_strlcpy((char *) error->args[i].buf, str, |
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101 ERR_MAX_STRLEN); |
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102 error->argc++; |
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103 } |
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104 break; |
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105 default: |
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106 break; |
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107 } |
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108 if (error->argc >= ERR_MAX_ARGS) { |
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109 break; |
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110 } |
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111 } |
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112 } |
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113 va_end(ap); |
0 | 114 |
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115 /* If we are in debug mode, print out an error message */ |
0 | 116 #ifdef DEBUG_ERROR |
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117 fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError()); |
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118 #ifdef __ANDROID__ |
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119 __android_log_print(ANDROID_LOG_INFO, "SDL", "ERROR: %s", SDL_GetError()); |
0 | 120 #endif |
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121 #endif /* DEBUG_ERROR */ |
0 | 122 } |
123 | |
124 /* This function has a bit more overhead than most error functions | |
125 so that it supports internationalization and thread-safe errors. | |
126 */ | |
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127 static char * |
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128 SDL_GetErrorMsg(char *errstr, unsigned int maxlen) |
0 | 129 { |
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130 SDL_error *error; |
0 | 131 |
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132 /* Clear the error string */ |
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133 *errstr = '\0'; |
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134 --maxlen; |
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135 |
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136 /* Get the thread-safe error, and print it out */ |
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137 error = SDL_GetErrBuf(); |
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138 if (error->error) { |
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139 const char *fmt; |
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140 char *msg = errstr; |
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141 int len; |
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142 int argi; |
0 | 143 |
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144 fmt = SDL_LookupString(error->key); |
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145 argi = 0; |
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146 while (*fmt && (maxlen > 0)) { |
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147 if (*fmt == '%') { |
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148 char tmp[32], *spot = tmp; |
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149 *spot++ = *fmt++; |
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150 while ((*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) |
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151 && spot < (tmp + SDL_arraysize(tmp) - 2)) { |
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152 *spot++ = *fmt++; |
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153 } |
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154 *spot++ = *fmt++; |
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155 *spot++ = '\0'; |
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156 switch (spot[-2]) { |
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157 case '%': |
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158 *msg++ = '%'; |
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159 maxlen -= 1; |
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160 break; |
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161 case 'c': |
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162 case 'i': |
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163 case 'd': |
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164 case 'u': |
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165 case 'o': |
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166 case 'x': |
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167 case 'X': |
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168 len = |
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169 SDL_snprintf(msg, maxlen, tmp, |
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170 error->args[argi++].value_i); |
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171 msg += len; |
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172 maxlen -= len; |
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173 break; |
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174 case 'f': |
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175 len = |
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176 SDL_snprintf(msg, maxlen, tmp, |
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177 error->args[argi++].value_f); |
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178 msg += len; |
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179 maxlen -= len; |
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180 break; |
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181 case 'p': |
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182 len = |
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183 SDL_snprintf(msg, maxlen, tmp, |
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184 error->args[argi++].value_ptr); |
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185 msg += len; |
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186 maxlen -= len; |
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187 break; |
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188 case 's': |
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189 len = |
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190 SDL_snprintf(msg, maxlen, tmp, |
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Reverted Bob's indent checkin
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191 SDL_LookupString(error->args[argi++]. |
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192 buf)); |
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193 msg += len; |
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194 maxlen -= len; |
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195 break; |
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196 } |
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197 } else { |
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198 *msg++ = *fmt++; |
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199 maxlen -= 1; |
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200 } |
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201 } |
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202 *msg = 0; /* NULL terminate the string */ |
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203 } |
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204 return (errstr); |
0 | 205 } |
206 | |
207 /* Available for backwards compatibility */ | |
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While you can actually write to the error buffer, conceptually it's read-only.
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208 const char * |
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209 SDL_GetError(void) |
0 | 210 { |
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211 static char errmsg[SDL_ERRBUFIZE]; |
0 | 212 |
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While you can actually write to the error buffer, conceptually it's read-only.
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213 return SDL_GetErrorMsg(errmsg, SDL_ERRBUFIZE); |
0 | 214 } |
215 | |
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216 void |
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217 SDL_ClearError(void) |
0 | 218 { |
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219 SDL_error *error; |
0 | 220 |
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221 error = SDL_GetErrBuf(); |
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222 error->error = 0; |
0 | 223 } |
224 | |
225 /* Very common errors go here */ | |
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226 void |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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227 SDL_Error(SDL_errorcode code) |
0 | 228 { |
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229 switch (code) { |
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230 case SDL_ENOMEM: |
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231 SDL_SetError("Out of memory"); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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232 break; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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233 case SDL_EFREAD: |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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234 SDL_SetError("Error reading from datastream"); |
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235 break; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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236 case SDL_EFWRITE: |
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237 SDL_SetError("Error writing to datastream"); |
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238 break; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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239 case SDL_EFSEEK: |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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240 SDL_SetError("Error seeking in datastream"); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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241 break; |
3317 | 242 case SDL_UNSUPPORTED: |
243 SDL_SetError("That operation is not supported"); | |
244 break; | |
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245 default: |
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|
246 SDL_SetError("Unknown SDL error"); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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247 break; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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248 } |
0 | 249 } |
250 | |
251 #ifdef TEST_ERROR | |
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252 int |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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253 main(int argc, char *argv[]) |
0 | 254 { |
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255 char buffer[BUFSIZ + 1]; |
0 | 256 |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
257 SDL_SetError("Hi there!"); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
258 printf("Error 1: %s\n", SDL_GetError()); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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259 SDL_ClearError(); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
260 SDL_memset(buffer, '1', BUFSIZ); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
261 buffer[BUFSIZ] = 0; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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262 SDL_SetError("This is the error: %s (%f)", buffer, 1.0); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
263 printf("Error 2: %s\n", SDL_GetError()); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
264 exit(0); |
0 | 265 } |
266 #endif | |
4992
b12d76ef05e2
Added an extra line for consistency
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|
267 |
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268 /* vi: set ts=4 sw=4 expandtab: */ |