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      1 /**************************************************************************
      2  *
      3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
      4  * Copyright 2009-2010 Chia-I Wu <olvaffe (at) gmail.com>
      5  * Copyright 2010-2011 LunarG, Inc.
      6  * All Rights Reserved.
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining a
      9  * copy of this software and associated documentation files (the
     10  * "Software"), to deal in the Software without restriction, including
     11  * without limitation the rights to use, copy, modify, merge, publish,
     12  * distribute, sub license, and/or sell copies of the Software, and to
     13  * permit persons to whom the Software is furnished to do so, subject to
     14  * the following conditions:
     15  *
     16  * The above copyright notice and this permission notice (including the
     17  * next paragraph) shall be included in all copies or substantial portions
     18  * of the Software.
     19  *
     20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     25  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     26  * DEALINGS IN THE SOFTWARE.
     27  *
     28  **************************************************************************/
     29 
     30 
     31 /**
     32  * Small/misc EGL functions
     33  */
     34 
     35 
     36 #include <assert.h>
     37 #include <string.h>
     38 #include "eglcurrent.h"
     39 #include "eglmisc.h"
     40 #include "egldisplay.h"
     41 #include "egldriver.h"
     42 #include "eglstring.h"
     43 
     44 
     45 /**
     46  * Copy the extension into the string and update the string pointer.
     47  */
     48 static EGLint
     49 _eglAppendExtension(char **str, const char *ext)
     50 {
     51    char *s = *str;
     52    size_t len = strlen(ext);
     53 
     54    if (s) {
     55       memcpy(s, ext, len);
     56       s[len++] = ' ';
     57       s[len] = '\0';
     58 
     59       *str += len;
     60    }
     61    else {
     62       len++;
     63    }
     64 
     65    return (EGLint) len;
     66 }
     67 
     68 
     69 /**
     70  * Examine the individual extension enable/disable flags and recompute
     71  * the driver's Extensions string.
     72  */
     73 static void
     74 _eglUpdateExtensionsString(_EGLDisplay *dpy)
     75 {
     76 #define _EGL_CHECK_EXTENSION(ext)                                          \
     77    do {                                                                    \
     78       if (dpy->Extensions.ext) {                                           \
     79          _eglAppendExtension(&exts, "EGL_" #ext);                          \
     80          assert(exts <= dpy->ExtensionsString + _EGL_MAX_EXTENSIONS_LEN);  \
     81       }                                                                    \
     82    } while (0)
     83 
     84    char *exts = dpy->ExtensionsString;
     85 
     86    if (exts[0])
     87       return;
     88 
     89    _EGL_CHECK_EXTENSION(MESA_screen_surface);
     90    _EGL_CHECK_EXTENSION(MESA_copy_context);
     91    _EGL_CHECK_EXTENSION(MESA_drm_display);
     92    _EGL_CHECK_EXTENSION(MESA_drm_image);
     93 
     94    _EGL_CHECK_EXTENSION(WL_bind_wayland_display);
     95 
     96    _EGL_CHECK_EXTENSION(KHR_image_base);
     97    _EGL_CHECK_EXTENSION(KHR_image_pixmap);
     98    if (dpy->Extensions.KHR_image_base && dpy->Extensions.KHR_image_pixmap)
     99       _eglAppendExtension(&exts, "EGL_KHR_image");
    100 
    101    _EGL_CHECK_EXTENSION(KHR_vg_parent_image);
    102    _EGL_CHECK_EXTENSION(KHR_gl_texture_2D_image);
    103    _EGL_CHECK_EXTENSION(KHR_gl_texture_cubemap_image);
    104    _EGL_CHECK_EXTENSION(KHR_gl_texture_3D_image);
    105    _EGL_CHECK_EXTENSION(KHR_gl_renderbuffer_image);
    106 
    107    _EGL_CHECK_EXTENSION(KHR_reusable_sync);
    108    _EGL_CHECK_EXTENSION(KHR_fence_sync);
    109 
    110    _EGL_CHECK_EXTENSION(KHR_surfaceless_context);
    111    _EGL_CHECK_EXTENSION(KHR_create_context);
    112 
    113    _EGL_CHECK_EXTENSION(NOK_swap_region);
    114    _EGL_CHECK_EXTENSION(NOK_texture_from_pixmap);
    115 
    116    _EGL_CHECK_EXTENSION(ANDROID_image_native_buffer);
    117 
    118    _EGL_CHECK_EXTENSION(EXT_create_context_robustness);
    119 
    120    _EGL_CHECK_EXTENSION(NV_post_sub_buffer);
    121 #undef _EGL_CHECK_EXTENSION
    122 }
    123 
    124 
    125 static void
    126 _eglUpdateAPIsString(_EGLDisplay *dpy)
    127 {
    128    char *apis = dpy->ClientAPIsString;
    129 
    130    if (apis[0] || !dpy->ClientAPIs)
    131       return;
    132 
    133    if (dpy->ClientAPIs & EGL_OPENGL_BIT)
    134       strcat(apis, "OpenGL ");
    135 
    136    if (dpy->ClientAPIs & EGL_OPENGL_ES_BIT)
    137       strcat(apis, "OpenGL_ES ");
    138 
    139    if (dpy->ClientAPIs & EGL_OPENGL_ES2_BIT)
    140       strcat(apis, "OpenGL_ES2 ");
    141 
    142    if (dpy->ClientAPIs & EGL_OPENVG_BIT)
    143       strcat(apis, "OpenVG ");
    144 
    145    assert(strlen(apis) < sizeof(dpy->ClientAPIsString));
    146 }
    147 
    148 
    149 const char *
    150 _eglQueryString(_EGLDriver *drv, _EGLDisplay *dpy, EGLint name)
    151 {
    152    (void) drv;
    153 
    154    switch (name) {
    155    case EGL_VENDOR:
    156       return _EGL_VENDOR_STRING;
    157    case EGL_VERSION:
    158       _eglsnprintf(dpy->VersionString, sizeof(dpy->VersionString),
    159               "%d.%d (%s)", dpy->VersionMajor, dpy->VersionMinor,
    160               dpy->Driver->Name);
    161       return dpy->VersionString;
    162    case EGL_EXTENSIONS:
    163       _eglUpdateExtensionsString(dpy);
    164       return dpy->ExtensionsString;
    165    case EGL_CLIENT_APIS:
    166       _eglUpdateAPIsString(dpy);
    167       return dpy->ClientAPIsString;
    168    default:
    169       _eglError(EGL_BAD_PARAMETER, "eglQueryString");
    170       return NULL;
    171    }
    172 }
    173