src/egl/main/eglmisc.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * Small/misc EGL functions
  31  */
  32
  33
  34 #include <assert.h>
  35 #include <string.h>
  36 #include "eglcurrent.h"
  37 #include "eglmisc.h"
  38 #include "egldisplay.h"
  39 #include "egldriver.h"
  40 #include "eglstring.h"
  41
  42
  43 /**
  44  * Copy the extension into the string and update the string pointer.
  45  */
  46 static EGLint
  47 _eglAppendExtension(char **str, const char *ext)
  48 {
  49    char *s = *str;
  50    size_t len = strlen(ext);
  51
  52    if (s) {
  53       memcpy(s, ext, len);
  54       s[len++] = ' ';
  55       s[len] = '\0';
  56
  57       *str += len;
  58    }
  59    else {
  60       len++;
  61    }
  62
  63    return (EGLint) len;
  64 }
  65
  66
  67 /**
  68  * Examine the individual extension enable/disable flags and recompute
  69  * the driver's Extensions string.
  70  */
  71 static void
  72 _eglUpdateExtensionsString(_EGLDisplay *dpy)
  73 {
  74 #define _EGL_CHECK_EXTENSION(ext)                                          \
  75    do {                                                                    \
  76       if (dpy->Extensions.ext) {                                           \
  77          _eglAppendExtension(&exts, "EGL_" #ext);                          \
  78          assert(exts <= dpy->ExtensionsString + _EGL_MAX_EXTENSIONS_LEN);  \
  79       }                                                                    \
  80    } while (0)
  81
  82    char *exts = dpy->ExtensionsString;
  83
  84    if (exts[0])
  85       return;
  86
  87    _EGL_CHECK_EXTENSION(MESA_screen_surface);
  88    _EGL_CHECK_EXTENSION(MESA_copy_context);
  89    _EGL_CHECK_EXTENSION(MESA_drm_display);
  90    _EGL_CHECK_EXTENSION(MESA_drm_image);
  91
  92    _EGL_CHECK_EXTENSION(KHR_image_base);
  93    _EGL_CHECK_EXTENSION(KHR_image_pixmap);
  94    if (dpy->Extensions.KHR_image_base && dpy->Extensions.KHR_image_pixmap)
  95       _eglAppendExtension(&exts, "EGL_KHR_image");
  96
  97    _EGL_CHECK_EXTENSION(KHR_vg_parent_image);
  98    _EGL_CHECK_EXTENSION(KHR_gl_texture_2D_image);
  99    _EGL_CHECK_EXTENSION(KHR_gl_texture_cubemap_image);
 100    _EGL_CHECK_EXTENSION(KHR_gl_texture_3D_image);
 101    _EGL_CHECK_EXTENSION(KHR_gl_renderbuffer_image);
 102
 103    _EGL_CHECK_EXTENSION(KHR_reusable_sync);
 104    _EGL_CHECK_EXTENSION(KHR_fence_sync);
 105
 106    _EGL_CHECK_EXTENSION(KHR_surfaceless_gles1);
 107    _EGL_CHECK_EXTENSION(KHR_surfaceless_gles2);
 108    _EGL_CHECK_EXTENSION(KHR_surfaceless_opengl);
 109
 110    _EGL_CHECK_EXTENSION(NOK_swap_region);
 111    _EGL_CHECK_EXTENSION(NOK_texture_from_pixmap);
 112 #undef _EGL_CHECK_EXTENSION
 113 }
 114
 115
 116 static void
 117 _eglUpdateAPIsString(_EGLDisplay *dpy)
 118 {
 119    char *apis = dpy->ClientAPIsString;
 120
 121    if (apis[0] || !dpy->ClientAPIs)
 122       return;
 123
 124    if (dpy->ClientAPIs & EGL_OPENGL_BIT)
 125       strcat(apis, "OpenGL ");
 126
 127    if (dpy->ClientAPIs & EGL_OPENGL_ES_BIT)
 128       strcat(apis, "OpenGL_ES ");
 129
 130    if (dpy->ClientAPIs & EGL_OPENGL_ES2_BIT)
 131       strcat(apis, "OpenGL_ES2 ");
 132
 133    if (dpy->ClientAPIs & EGL_OPENVG_BIT)
 134       strcat(apis, "OpenVG ");
 135
 136    assert(strlen(apis) < sizeof(dpy->ClientAPIsString));
 137 }
 138
 139
 140 const char *
 141 _eglQueryString(_EGLDriver *drv, _EGLDisplay *dpy, EGLint name)
 142 {
 143    (void) drv;
 144
 145    switch (name) {
 146    case EGL_VENDOR:
 147       return _EGL_VENDOR_STRING;
 148    case EGL_VERSION:
 149       _eglsnprintf(dpy->VersionString, sizeof(dpy->VersionString),
 150               "%d.%d (%s)", dpy->VersionMajor, dpy->VersionMinor,
 151               dpy->Driver->Name);
 152       return dpy->VersionString;
 153    case EGL_EXTENSIONS:
 154       _eglUpdateExtensionsString(dpy);
 155       return dpy->ExtensionsString;
 156    case EGL_CLIENT_APIS:
 157       _eglUpdateAPIsString(dpy);
 158       return dpy->ClientAPIsString;
 159    default:
 160       _eglError(EGL_BAD_PARAMETER, "eglQueryString");
 161       return NULL;
 162    }
 163 }