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4358 | Serge | 1 | /* |
2 | Copyright (c) 2008 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 | |||
35 | #include "apple_cgl.h" |
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36 | #include "apple_glx.h" |
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37 | |||
38 | #ifndef OPENGL_FRAMEWORK_PATH |
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39 | #define OPENGL_FRAMEWORK_PATH "/System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL" |
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40 | #endif |
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41 | |||
42 | static void *dl_handle = NULL; |
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43 | |||
44 | struct apple_cgl_api apple_cgl; |
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45 | |||
46 | static bool initialized = false; |
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47 | |||
48 | static void * |
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49 | sym(void *h, const char *name) |
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50 | { |
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51 | void *s; |
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52 | |||
53 | s = dlsym(h, name); |
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54 | |||
55 | if (NULL == s) { |
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56 | fprintf(stderr, "error: %s\n", dlerror()); |
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57 | abort(); |
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58 | } |
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59 | |||
60 | return s; |
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61 | } |
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62 | |||
63 | void |
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64 | apple_cgl_init(void) |
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65 | { |
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66 | void *h; |
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67 | const char *opengl_framework_path; |
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68 | |||
69 | if (initialized) |
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70 | return; |
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71 | |||
72 | opengl_framework_path = getenv("OPENGL_FRAMEWORK_PATH"); |
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73 | if (!opengl_framework_path) { |
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74 | opengl_framework_path = OPENGL_FRAMEWORK_PATH; |
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75 | } |
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76 | |||
77 | (void) dlerror(); /*drain dlerror */ |
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78 | h = dlopen(opengl_framework_path, RTLD_NOW); |
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79 | |||
80 | if (NULL == h) { |
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81 | fprintf(stderr, "error: unable to dlopen %s : %s\n", |
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82 | opengl_framework_path, dlerror()); |
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83 | abort(); |
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84 | } |
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85 | |||
86 | dl_handle = h; |
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87 | |||
88 | apple_cgl.get_version = sym(h, "CGLGetVersion"); |
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89 | |||
90 | apple_cgl.get_version(&apple_cgl.version_major, &apple_cgl.version_minor); |
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91 | |||
92 | apple_glx_diagnostic("CGL major %d minor %d\n", apple_cgl.version_major, apple_cgl.version_minor); |
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93 | |||
94 | if (1 != apple_cgl.version_major) { |
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95 | fprintf(stderr, "WARNING: the CGL major version has changed!\n" |
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96 | "libGL may be incompatible!\n"); |
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97 | } |
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98 | |||
99 | apple_cgl.choose_pixel_format = sym(h, "CGLChoosePixelFormat"); |
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100 | apple_cgl.destroy_pixel_format = sym(h, "CGLDestroyPixelFormat"); |
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101 | |||
102 | apple_cgl.clear_drawable = sym(h, "CGLClearDrawable"); |
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103 | apple_cgl.flush_drawable = sym(h, "CGLFlushDrawable"); |
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104 | |||
105 | apple_cgl.create_context = sym(h, "CGLCreateContext"); |
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106 | apple_cgl.destroy_context = sym(h, "CGLDestroyContext"); |
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107 | |||
108 | apple_cgl.set_current_context = sym(h, "CGLSetCurrentContext"); |
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109 | apple_cgl.get_current_context = sym(h, "CGLGetCurrentContext"); |
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110 | apple_cgl.error_string = sym(h, "CGLErrorString"); |
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111 | |||
112 | apple_cgl.set_off_screen = sym(h, "CGLSetOffScreen"); |
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113 | |||
114 | apple_cgl.copy_context = sym(h, "CGLCopyContext"); |
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115 | |||
116 | apple_cgl.create_pbuffer = sym(h, "CGLCreatePBuffer"); |
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117 | apple_cgl.destroy_pbuffer = sym(h, "CGLDestroyPBuffer"); |
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118 | apple_cgl.set_pbuffer = sym(h, "CGLSetPBuffer"); |
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119 | |||
120 | initialized = true; |
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121 | } |
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122 | |||
123 | void * |
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124 | apple_cgl_get_dl_handle(void) |
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125 | { |
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126 | return dl_handle; |
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127 | } |