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5563 | serge | 1 | /* |
2 | Copyright (c) 2008, 2009 Apple Inc. |
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3 | |||
4 | Permission is hereby granted, free of charge, to any person |
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5 | obtaining a copy of this software and associated documentation files |
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6 | (the "Software"), to deal in the Software without restriction, |
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7 | including without limitation the rights to use, copy, modify, merge, |
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8 | publish, distribute, sublicense, and/or sell copies of the Software, |
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9 | and to permit persons to whom the Software is furnished to do so, |
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10 | subject to the following conditions: |
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11 | |||
12 | The above copyright notice and this permission notice shall be |
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13 | included in all copies or substantial portions of the Software. |
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14 | |||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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16 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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17 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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18 | NONINFRINGEMENT. IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT |
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19 | HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
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20 | WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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21 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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22 | DEALINGS IN THE SOFTWARE. |
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23 | |||
24 | Except as contained in this notice, the name(s) of the above |
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25 | copyright holders shall not be used in advertising or otherwise to |
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26 | promote the sale, use or other dealings in this Software without |
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27 | prior written authorization. |
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28 | */ |
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29 | |||
30 | #include |
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31 | #include |
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32 | #include |
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33 | #include |
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34 | #include |
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35 | #include |
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36 | #include "apple_glx.h" |
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37 | #include "apple_glx_context.h" |
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38 | #include "apple_glx_drawable.h" |
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39 | #include "appledri.h" |
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40 | |||
41 | static pthread_mutex_t drawables_lock = PTHREAD_MUTEX_INITIALIZER; |
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42 | static struct apple_glx_drawable *drawables_list = NULL; |
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43 | |||
44 | static void |
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45 | lock_drawables_list(void) |
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46 | { |
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47 | int err; |
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48 | |||
49 | err = pthread_mutex_lock(&drawables_lock); |
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50 | |||
51 | if (err) { |
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52 | fprintf(stderr, "pthread_mutex_lock failure in %s: %s\n", |
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53 | __func__, strerror(err)); |
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54 | abort(); |
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55 | } |
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56 | } |
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57 | |||
58 | static void |
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59 | unlock_drawables_list(void) |
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60 | { |
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61 | int err; |
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62 | |||
63 | err = pthread_mutex_unlock(&drawables_lock); |
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64 | |||
65 | if (err) { |
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66 | fprintf(stderr, "pthread_mutex_unlock failure in %s: %s\n", |
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67 | __func__, strerror(err)); |
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68 | abort(); |
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69 | } |
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70 | } |
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71 | |||
72 | struct apple_glx_drawable * |
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73 | apple_glx_find_drawable(Display * dpy, GLXDrawable drawable) |
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74 | { |
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75 | struct apple_glx_drawable *i, *agd = NULL; |
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76 | |||
77 | lock_drawables_list(); |
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78 | |||
79 | for (i = drawables_list; i; i = i->next) { |
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80 | if (i->drawable == drawable) { |
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81 | agd = i; |
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82 | break; |
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83 | } |
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84 | } |
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85 | |||
86 | unlock_drawables_list(); |
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87 | |||
88 | return agd; |
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89 | } |
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90 | |||
91 | static void |
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92 | drawable_lock(struct apple_glx_drawable *agd) |
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93 | { |
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94 | int err; |
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95 | |||
96 | err = pthread_mutex_lock(&agd->mutex); |
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97 | |||
98 | if (err) { |
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99 | fprintf(stderr, "pthread_mutex_lock error: %s\n", strerror(err)); |
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100 | abort(); |
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101 | } |
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102 | } |
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103 | |||
104 | static void |
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105 | drawable_unlock(struct apple_glx_drawable *d) |
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106 | { |
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107 | int err; |
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108 | |||
109 | err = pthread_mutex_unlock(&d->mutex); |
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110 | |||
111 | if (err) { |
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112 | fprintf(stderr, "pthread_mutex_unlock error: %s\n", strerror(err)); |
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113 | abort(); |
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114 | } |
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115 | } |
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116 | |||
117 | |||
118 | static void |
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119 | reference_drawable(struct apple_glx_drawable *d) |
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120 | { |
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121 | d->lock(d); |
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122 | d->reference_count++; |
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123 | d->unlock(d); |
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124 | } |
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125 | |||
126 | static void |
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127 | release_drawable(struct apple_glx_drawable *d) |
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128 | { |
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129 | d->lock(d); |
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130 | d->reference_count--; |
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131 | d->unlock(d); |
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132 | } |
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133 | |||
134 | /* The drawables list must be locked prior to calling this. */ |
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135 | /* Return true if the drawable was destroyed. */ |
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136 | static bool |
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137 | destroy_drawable(struct apple_glx_drawable *d) |
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138 | { |
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139 | int err; |
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140 | |||
141 | d->lock(d); |
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142 | |||
143 | if (d->reference_count > 0) { |
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144 | d->unlock(d); |
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145 | return false; |
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146 | } |
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147 | |||
148 | d->unlock(d); |
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149 | |||
150 | if (d->previous) { |
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151 | d->previous->next = d->next; |
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152 | } |
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153 | else { |
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154 | /* |
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155 | * The item must be at the head of the list, if it |
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156 | * has no previous pointer. |
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157 | */ |
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158 | drawables_list = d->next; |
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159 | } |
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160 | |||
161 | if (d->next) |
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162 | d->next->previous = d->previous; |
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163 | |||
164 | unlock_drawables_list(); |
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165 | |||
166 | if (d->callbacks.destroy) { |
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167 | /* |
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168 | * Warning: this causes other routines to be called (potentially) |
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169 | * from surface_notify_handler. It's probably best to not have |
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170 | * any locks at this point locked. |
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171 | */ |
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172 | d->callbacks.destroy(d->display, d); |
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173 | } |
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174 | |||
175 | apple_glx_diagnostic("%s: freeing %p\n", __func__, (void *) d); |
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176 | |||
177 | /* Stupid recursive locks */ |
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178 | while (pthread_mutex_unlock(&d->mutex) == 0); |
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179 | |||
180 | err = pthread_mutex_destroy(&d->mutex); |
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181 | if (err) { |
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182 | fprintf(stderr, "pthread_mutex_destroy error: %s\n", strerror(err)); |
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183 | abort(); |
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184 | } |
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185 | |||
186 | free(d); |
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187 | |||
188 | /* So that the locks are balanced and the caller correctly unlocks. */ |
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189 | lock_drawables_list(); |
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190 | |||
191 | return true; |
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192 | } |
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193 | |||
194 | /* |
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195 | * This is typically called when a context is destroyed or the current |
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196 | * drawable is made None. |
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197 | */ |
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198 | static bool |
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199 | destroy_drawable_callback(struct apple_glx_drawable *d) |
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200 | { |
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201 | bool result; |
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202 | |||
203 | d->lock(d); |
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204 | |||
205 | apple_glx_diagnostic("%s: %p ->reference_count before -- %d\n", __func__, |
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206 | (void *) d, d->reference_count); |
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207 | |||
208 | d->reference_count--; |
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209 | |||
210 | if (d->reference_count > 0) { |
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211 | d->unlock(d); |
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212 | return false; |
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213 | } |
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214 | |||
215 | d->unlock(d); |
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216 | |||
217 | lock_drawables_list(); |
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218 | |||
219 | result = destroy_drawable(d); |
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220 | |||
221 | unlock_drawables_list(); |
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222 | |||
223 | return result; |
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224 | } |
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225 | |||
226 | static bool |
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227 | is_pbuffer(struct apple_glx_drawable *d) |
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228 | { |
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229 | return APPLE_GLX_DRAWABLE_PBUFFER == d->type; |
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230 | } |
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231 | |||
232 | static bool |
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233 | is_pixmap(struct apple_glx_drawable *d) |
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234 | { |
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235 | return APPLE_GLX_DRAWABLE_PIXMAP == d->type; |
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236 | } |
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237 | |||
238 | static void |
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239 | common_init(Display * dpy, GLXDrawable drawable, struct apple_glx_drawable *d) |
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240 | { |
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241 | int err; |
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242 | pthread_mutexattr_t attr; |
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243 | |||
244 | d->display = dpy; |
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245 | d->reference_count = 0; |
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246 | d->drawable = drawable; |
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247 | d->type = -1; |
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248 | |||
249 | err = pthread_mutexattr_init(&attr); |
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250 | |||
251 | if (err) { |
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252 | fprintf(stderr, "pthread_mutexattr_init error: %s\n", strerror(err)); |
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253 | abort(); |
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254 | } |
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255 | |||
256 | /* |
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257 | * There are some patterns that require a recursive mutex, |
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258 | * when working with locks that protect the apple_glx_drawable, |
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259 | * and reference functions like ->reference, and ->release. |
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260 | */ |
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261 | err = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
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262 | |||
263 | if (err) { |
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264 | fprintf(stderr, "error: setting pthread mutex type: %s\n", strerror(err)); |
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265 | abort(); |
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266 | } |
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267 | |||
268 | err = pthread_mutex_init(&d->mutex, &attr); |
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269 | |||
270 | if (err) { |
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271 | fprintf(stderr, "pthread_mutex_init error: %s\n", strerror(err)); |
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272 | abort(); |
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273 | } |
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274 | |||
275 | (void) pthread_mutexattr_destroy(&attr); |
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276 | |||
277 | d->lock = drawable_lock; |
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278 | d->unlock = drawable_unlock; |
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279 | |||
280 | d->reference = reference_drawable; |
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281 | d->release = release_drawable; |
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282 | |||
283 | d->destroy = destroy_drawable_callback; |
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284 | |||
285 | d->is_pbuffer = is_pbuffer; |
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286 | d->is_pixmap = is_pixmap; |
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287 | |||
288 | d->width = -1; |
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289 | d->height = -1; |
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290 | d->row_bytes = 0; |
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291 | d->path[0] = '\0'; |
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292 | d->fd = -1; |
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293 | d->buffer = NULL; |
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294 | d->buffer_length = 0; |
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295 | |||
296 | d->previous = NULL; |
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297 | d->next = NULL; |
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298 | } |
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299 | |||
300 | static void |
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301 | link_tail(struct apple_glx_drawable *agd) |
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302 | { |
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303 | lock_drawables_list(); |
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304 | |||
305 | /* Link the new drawable into the global list. */ |
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306 | agd->next = drawables_list; |
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307 | |||
308 | if (drawables_list) |
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309 | drawables_list->previous = agd; |
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310 | |||
311 | drawables_list = agd; |
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312 | |||
313 | unlock_drawables_list(); |
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314 | } |
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315 | |||
316 | /*WARNING: this returns a locked and referenced object. */ |
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317 | bool |
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318 | apple_glx_drawable_create(Display * dpy, |
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319 | int screen, |
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320 | GLXDrawable drawable, |
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321 | struct apple_glx_drawable **agdResult, |
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322 | struct apple_glx_drawable_callbacks *callbacks) |
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323 | { |
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324 | struct apple_glx_drawable *d; |
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325 | |||
326 | d = calloc(1, sizeof *d); |
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327 | |||
328 | if (NULL == d) { |
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329 | perror("malloc"); |
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330 | return true; |
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331 | } |
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332 | |||
333 | common_init(dpy, drawable, d); |
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334 | d->type = callbacks->type; |
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335 | d->callbacks = *callbacks; |
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336 | |||
337 | d->reference(d); |
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338 | d->lock(d); |
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339 | |||
340 | link_tail(d); |
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341 | |||
342 | apple_glx_diagnostic("%s: new drawable %p\n", __func__, (void *) d); |
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343 | |||
344 | *agdResult = d; |
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345 | |||
346 | return false; |
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347 | } |
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348 | |||
349 | static int error_count = 0; |
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350 | |||
351 | static int |
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352 | error_handler(Display * dpy, XErrorEvent * err) |
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353 | { |
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354 | if (err->error_code == BadWindow) { |
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355 | ++error_count; |
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356 | } |
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357 | |||
358 | return 0; |
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359 | } |
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360 | |||
361 | void |
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362 | apple_glx_garbage_collect_drawables(Display * dpy) |
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363 | { |
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364 | struct apple_glx_drawable *d, *dnext; |
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365 | Window root; |
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366 | int x, y; |
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367 | unsigned int width, height, bd, depth; |
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368 | int (*old_handler) (Display *, XErrorEvent *); |
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369 | |||
370 | |||
371 | if (NULL == drawables_list) |
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372 | return; |
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373 | |||
374 | old_handler = XSetErrorHandler(error_handler); |
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375 | |||
376 | XSync(dpy, False); |
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377 | |||
378 | lock_drawables_list(); |
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379 | |||
380 | for (d = drawables_list; d;) { |
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381 | dnext = d->next; |
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382 | |||
383 | d->lock(d); |
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384 | |||
385 | if (d->reference_count > 0) { |
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386 | /* |
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387 | * Skip this, because some context still retains a reference |
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388 | * to the drawable. |
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389 | */ |
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390 | d->unlock(d); |
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391 | d = dnext; |
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392 | continue; |
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393 | } |
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394 | |||
395 | d->unlock(d); |
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396 | |||
397 | error_count = 0; |
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398 | |||
399 | /* |
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400 | * Mesa uses XGetWindowAttributes, but some of these things are |
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401 | * most definitely not Windows, and that's against the rules. |
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402 | * XGetGeometry on the other hand is legal with a Pixmap and Window. |
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403 | */ |
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404 | XGetGeometry(dpy, d->drawable, &root, &x, &y, &width, &height, &bd, |
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405 | &depth); |
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406 | |||
407 | if (error_count > 0) { |
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408 | /* |
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409 | * Note: this may not actually destroy the drawable. |
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410 | * If another context retains a reference to the drawable |
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411 | * after the reference count test above. |
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412 | */ |
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413 | (void) destroy_drawable(d); |
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414 | error_count = 0; |
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415 | } |
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416 | |||
417 | d = dnext; |
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418 | } |
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419 | |||
420 | XSetErrorHandler(old_handler); |
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421 | |||
422 | unlock_drawables_list(); |
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423 | } |
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424 | |||
425 | unsigned int |
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426 | apple_glx_get_drawable_count(void) |
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427 | { |
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428 | unsigned int result = 0; |
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429 | struct apple_glx_drawable *d; |
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430 | |||
431 | lock_drawables_list(); |
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432 | |||
433 | for (d = drawables_list; d; d = d->next) |
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434 | ++result; |
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435 | |||
436 | unlock_drawables_list(); |
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437 | |||
438 | return result; |
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439 | } |
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440 | |||
441 | struct apple_glx_drawable * |
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442 | apple_glx_drawable_find_by_type(GLXDrawable drawable, int type, int flags) |
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443 | { |
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444 | struct apple_glx_drawable *d; |
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445 | |||
446 | lock_drawables_list(); |
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447 | |||
448 | for (d = drawables_list; d; d = d->next) { |
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449 | if (d->type == type && d->drawable == drawable) { |
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450 | if (flags & APPLE_GLX_DRAWABLE_REFERENCE) |
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451 | d->reference(d); |
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452 | |||
453 | if (flags & APPLE_GLX_DRAWABLE_LOCK) |
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454 | d->lock(d); |
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455 | |||
456 | unlock_drawables_list(); |
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457 | |||
458 | return d; |
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459 | } |
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460 | } |
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461 | |||
462 | unlock_drawables_list(); |
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463 | |||
464 | return NULL; |
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465 | } |
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466 | |||
467 | struct apple_glx_drawable * |
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468 | apple_glx_drawable_find(GLXDrawable drawable, int flags) |
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469 | { |
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470 | struct apple_glx_drawable *d; |
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471 | |||
472 | lock_drawables_list(); |
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473 | |||
474 | for (d = drawables_list; d; d = d->next) { |
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475 | if (d->drawable == drawable) { |
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476 | if (flags & APPLE_GLX_DRAWABLE_REFERENCE) |
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477 | d->reference(d); |
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478 | |||
479 | if (flags & APPLE_GLX_DRAWABLE_LOCK) |
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480 | d->lock(d); |
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481 | |||
482 | unlock_drawables_list(); |
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483 | |||
484 | return d; |
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485 | } |
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486 | } |
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487 | |||
488 | unlock_drawables_list(); |
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489 | |||
490 | return NULL; |
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491 | } |
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492 | |||
493 | /* Return true if the type is valid for the drawable. */ |
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494 | bool |
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495 | apple_glx_drawable_destroy_by_type(Display * dpy, |
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496 | GLXDrawable drawable, int type) |
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497 | { |
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498 | struct apple_glx_drawable *d; |
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499 | |||
500 | lock_drawables_list(); |
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501 | |||
502 | for (d = drawables_list; d; d = d->next) { |
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503 | if (drawable == d->drawable && type == d->type) { |
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504 | /* |
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505 | * The user has requested that we destroy this resource. |
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506 | * However, there may be references in the contexts to it, so |
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507 | * release it, and call destroy_drawable which doesn't destroy |
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508 | * if the reference_count is > 0. |
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509 | */ |
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510 | d->release(d); |
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511 | |||
512 | apple_glx_diagnostic("%s d->reference_count %d\n", |
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513 | __func__, d->reference_count); |
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514 | |||
515 | destroy_drawable(d); |
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516 | unlock_drawables_list(); |
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517 | return true; |
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518 | } |
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519 | } |
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520 | |||
521 | unlock_drawables_list(); |
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522 | |||
523 | return false; |
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524 | } |
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525 | |||
526 | struct apple_glx_drawable * |
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527 | apple_glx_drawable_find_by_uid(unsigned int uid, int flags) |
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528 | { |
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529 | struct apple_glx_drawable *d; |
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530 | |||
531 | lock_drawables_list(); |
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532 | |||
533 | for (d = drawables_list; d; d = d->next) { |
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534 | /* Only surfaces have a uid. */ |
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535 | if (APPLE_GLX_DRAWABLE_SURFACE == d->type) { |
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536 | if (d->types.surface.uid == uid) { |
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537 | if (flags & APPLE_GLX_DRAWABLE_REFERENCE) |
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538 | d->reference(d); |
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539 | |||
540 | if (flags & APPLE_GLX_DRAWABLE_LOCK) |
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541 | d->lock(d); |
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542 | |||
543 | unlock_drawables_list(); |
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544 | |||
545 | return d; |
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546 | } |
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547 | } |
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548 | } |
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549 | |||
550 | unlock_drawables_list(); |
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551 | |||
552 | return NULL; |
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553 | } |