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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
  4.  * Copyright 2009-2010 Chia-I Wu <olvaffe@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.    _EGL_CHECK_EXTENSION(EXT_buffer_age);
  120.    _EGL_CHECK_EXTENSION(EXT_swap_buffers_with_damage);
  121.  
  122.    _EGL_CHECK_EXTENSION(NV_post_sub_buffer);
  123. #undef _EGL_CHECK_EXTENSION
  124. }
  125.  
  126.  
  127. static void
  128. _eglUpdateAPIsString(_EGLDisplay *dpy)
  129. {
  130.    char *apis = dpy->ClientAPIsString;
  131.  
  132.    if (apis[0] || !dpy->ClientAPIs)
  133.       return;
  134.  
  135.    if (dpy->ClientAPIs & EGL_OPENGL_BIT)
  136.       strcat(apis, "OpenGL ");
  137.  
  138.    if (dpy->ClientAPIs & EGL_OPENGL_ES_BIT)
  139.       strcat(apis, "OpenGL_ES ");
  140.  
  141.    if (dpy->ClientAPIs & EGL_OPENGL_ES2_BIT)
  142.       strcat(apis, "OpenGL_ES2 ");
  143.  
  144.    if (dpy->ClientAPIs & EGL_OPENGL_ES3_BIT_KHR)
  145.       strcat(apis, "OpenGL_ES3 ");
  146.  
  147.    if (dpy->ClientAPIs & EGL_OPENVG_BIT)
  148.       strcat(apis, "OpenVG ");
  149.  
  150.    assert(strlen(apis) < sizeof(dpy->ClientAPIsString));
  151. }
  152.  
  153.  
  154. const char *
  155. _eglQueryString(_EGLDriver *drv, _EGLDisplay *dpy, EGLint name)
  156. {
  157.    (void) drv;
  158.  
  159.    switch (name) {
  160.    case EGL_VENDOR:
  161.       return _EGL_VENDOR_STRING;
  162.    case EGL_VERSION:
  163.       _eglsnprintf(dpy->VersionString, sizeof(dpy->VersionString),
  164.               "%d.%d (%s)", dpy->VersionMajor, dpy->VersionMinor,
  165.               dpy->Driver->Name);
  166.       return dpy->VersionString;
  167.    case EGL_EXTENSIONS:
  168.       _eglUpdateExtensionsString(dpy);
  169.       return dpy->ExtensionsString;
  170.    case EGL_CLIENT_APIS:
  171.       _eglUpdateAPIsString(dpy);
  172.       return dpy->ClientAPIsString;
  173.    default:
  174.       _eglError(EGL_BAD_PARAMETER, "eglQueryString");
  175.       return NULL;
  176.    }
  177. }
  178.