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      1 /*
      2  * Copyright  2013 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  */
     23 
     24 #include <assert.h>
     25 #include <string.h>
     26 #include <stdio.h>
     27 
     28 #include "dispatch_common.h"
     29 
     30 int
     31 epoxy_conservative_egl_version(void)
     32 {
     33     EGLDisplay dpy = eglGetCurrentDisplay();
     34 
     35     if (!dpy)
     36         return 14;
     37 
     38     return epoxy_egl_version(dpy);
     39 }
     40 
     41 /**
     42  * @brief Returns the version of OpenGL we are using
     43  *
     44  * The version is encoded as:
     45  *
     46  * ```
     47  *
     48  *   version = major * 10 + minor
     49  *
     50  * ```
     51  *
     52  * So it can be easily used for version comparisons.
     53  *
     54  * @param The EGL display
     55  *
     56  * @return The encoded version of EGL we are using
     57  *
     58  * @see epoxy_gl_version()
     59  */
     60 int
     61 epoxy_egl_version(EGLDisplay dpy)
     62 {
     63     int major, minor;
     64     const char *version_string;
     65     int ret;
     66 
     67     version_string = eglQueryString(dpy, EGL_VERSION);
     68     if (!version_string)
     69         return 0;
     70 
     71     ret = sscanf(version_string, "%d.%d", &major, &minor);
     72     assert(ret == 2);
     73     return major * 10 + minor;
     74 }
     75 
     76 bool
     77 epoxy_conservative_has_egl_extension(const char *ext)
     78 {
     79     return epoxy_has_egl_extension(eglGetCurrentDisplay(), ext);
     80 }
     81 
     82 /**
     83  * @brief Returns true if the given EGL extension is supported in the current context.
     84  *
     85  * @param dpy The EGL display
     86  * @param extension The name of the EGL extension
     87  *
     88  * @return `true` if the extension is available
     89  *
     90  * @see epoxy_has_gl_extension()
     91  * @see epoxy_has_glx_extension()
     92  */
     93 bool
     94 epoxy_has_egl_extension(EGLDisplay dpy, const char *ext)
     95 {
     96     return epoxy_extension_in_string(eglQueryString(dpy, EGL_EXTENSIONS), ext) || epoxy_extension_in_string(eglQueryString(NULL, EGL_EXTENSIONS), ext);
     97 }
     98 
     99 /**
    100  * @brief Checks whether EGL is available.
    101  *
    102  * @return `true` if EGL is available
    103  *
    104  * @newin{1,4}
    105  */
    106 bool
    107 epoxy_has_egl(void)
    108 {
    109 #if !PLATFORM_HAS_EGL
    110     return false;
    111 #else
    112     if (epoxy_load_egl(false, true)) {
    113         EGLDisplay* (* pf_eglGetCurrentDisplay) (void);
    114 
    115         pf_eglGetCurrentDisplay = epoxy_conservative_egl_dlsym("eglGetCurrentDisplay", false);
    116         if (pf_eglGetCurrentDisplay)
    117             return true;
    118     }
    119 
    120     return false;
    121 #endif /* PLATFORM_HAS_EGL */
    122 }
    123