src/egl/main/eglmisc.c

   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_gles1);
 111    _EGL_CHECK_EXTENSION(KHR_surfaceless_gles2);
 112    _EGL_CHECK_EXTENSION(KHR_surfaceless_opengl);
 113
 114    _EGL_CHECK_EXTENSION(NOK_swap_region);
 115    _EGL_CHECK_EXTENSION(NOK_texture_from_pixmap);
 116 #undef _EGL_CHECK_EXTENSION
 117 }
 118
 119
 120 static void
 121 _eglUpdateAPIsString(_EGLDisplay *dpy)
 122 {
 123    char *apis = dpy->ClientAPIsString;
 124
 125    if (apis[0] || !dpy->ClientAPIs)
 126       return;
 127
 128    if (dpy->ClientAPIs & EGL_OPENGL_BIT)
 129       strcat(apis, "OpenGL ");
 130
 131    if (dpy->ClientAPIs & EGL_OPENGL_ES_BIT)
 132       strcat(apis, "OpenGL_ES ");
 133
 134    if (dpy->ClientAPIs & EGL_OPENGL_ES2_BIT)
 135       strcat(apis, "OpenGL_ES2 ");
 136
 137    if (dpy->ClientAPIs & EGL_OPENVG_BIT)
 138       strcat(apis, "OpenVG ");
 139
 140    assert(strlen(apis) < sizeof(dpy->ClientAPIsString));
 141 }
 142
 143
 144 const char *
 145 _eglQueryString(_EGLDriver *drv, _EGLDisplay *dpy, EGLint name)
 146 {
 147    (void) drv;
 148
 149    switch (name) {
 150    case EGL_VENDOR:
 151       return _EGL_VENDOR_STRING;
 152    case EGL_VERSION:
 153       _eglsnprintf(dpy->VersionString, sizeof(dpy->VersionString),
 154               "%d.%d (%s)", dpy->VersionMajor, dpy->VersionMinor,
 155               dpy->Driver->Name);
 156       return dpy->VersionString;
 157    case EGL_EXTENSIONS:
 158       _eglUpdateExtensionsString(dpy);
 159       return dpy->ExtensionsString;
 160    case EGL_CLIENT_APIS:
 161       _eglUpdateAPIsString(dpy);
 162       return dpy->ClientAPIsString;
 163    default:
 164       _eglError(EGL_BAD_PARAMETER, "eglQueryString");
 165       return NULL;
 166    }
 167 }