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
  40
  41 /**
  42  * Copy the extension into the string and update the string pointer.
  43  */
  44 static EGLint
  45 _eglAppendExtension(char **str, const char *ext)
  46 {
  47    char *s = *str;
  48    size_t len = strlen(ext);
  49
  50    if (s) {
  51       memcpy(s, ext, len);
  52       s[len++] = ' ';
  53       s[len] = '\0';
  54
  55       *str += len;
  56    }
  57    else {
  58       len++;
  59    }
  60
  61    return (EGLint) len;
  62 }
  63
  64
  65 /**
  66  * Examine the individual extension enable/disable flags and recompute
  67  * the driver's Extensions string.
  68  */
  69 static void
  70 _eglUpdateExtensionsString(_EGLDisplay *dpy)
  71 {
  72 #define _EGL_CHECK_EXTENSION(ext)                                          \
  73    do {                                                                    \
  74       if (dpy->Extensions.ext) {                                           \
  75          _eglAppendExtension(&exts, "EGL_" #ext);                          \
  76          assert(exts <= dpy->Extensions.String + _EGL_MAX_EXTENSIONS_LEN); \
  77       }                                                                    \
  78    } while (0)
  79
  80    char *exts = dpy->Extensions.String;
  81
  82    if (exts[0])
  83       return;
  84
  85    _EGL_CHECK_EXTENSION(MESA_screen_surface);
  86    _EGL_CHECK_EXTENSION(MESA_copy_context);
  87    _EGL_CHECK_EXTENSION(MESA_drm_display);
  88    _EGL_CHECK_EXTENSION(MESA_drm_image);
  89
  90    _EGL_CHECK_EXTENSION(KHR_image_base);
  91    _EGL_CHECK_EXTENSION(KHR_image_pixmap);
  92    if (dpy->Extensions.KHR_image_base && dpy->Extensions.KHR_image_pixmap)
  93       _eglAppendExtension(&exts, "EGL_KHR_image");
  94
  95    _EGL_CHECK_EXTENSION(KHR_vg_parent_image);
  96    _EGL_CHECK_EXTENSION(KHR_gl_texture_2D_image);
  97    _EGL_CHECK_EXTENSION(KHR_gl_texture_cubemap_image);
  98    _EGL_CHECK_EXTENSION(KHR_gl_texture_3D_image);
  99    _EGL_CHECK_EXTENSION(KHR_gl_renderbuffer_image);
 100
 101    _EGL_CHECK_EXTENSION(KHR_reusable_sync);
 102    _EGL_CHECK_EXTENSION(KHR_fence_sync);
 103
 104    _EGL_CHECK_EXTENSION(KHR_surfaceless_gles1);
 105    _EGL_CHECK_EXTENSION(KHR_surfaceless_gles2);
 106    _EGL_CHECK_EXTENSION(KHR_surfaceless_opengl);
 107
 108    _EGL_CHECK_EXTENSION(NOK_swap_region);
 109    _EGL_CHECK_EXTENSION(NOK_texture_from_pixmap);
 110 #undef _EGL_CHECK_EXTENSION
 111 }
 112
 113
 114 static void
 115 _eglUpdateAPIsString(_EGLDisplay *dpy)
 116 {
 117    char *apis = dpy->ClientAPIs;
 118
 119    if (apis[0] || !dpy->ClientAPIsMask)
 120       return;
 121
 122    if (dpy->ClientAPIsMask & EGL_OPENGL_BIT)
 123       strcat(apis, "OpenGL ");
 124
 125    if (dpy->ClientAPIsMask & EGL_OPENGL_ES_BIT)
 126       strcat(apis, "OpenGL_ES ");
 127
 128    if (dpy->ClientAPIsMask & EGL_OPENGL_ES2_BIT)
 129       strcat(apis, "OpenGL_ES2 ");
 130
 131    if (dpy->ClientAPIsMask & EGL_OPENVG_BIT)
 132       strcat(apis, "OpenVG ");
 133
 134    assert(strlen(apis) < sizeof(dpy->ClientAPIs));
 135 }
 136
 137
 138 const char *
 139 _eglQueryString(_EGLDriver *drv, _EGLDisplay *dpy, EGLint name)
 140 {
 141    (void) drv;
 142    (void) dpy;
 143    switch (name) {
 144    case EGL_VENDOR:
 145       return _EGL_VENDOR_STRING;
 146    case EGL_VERSION:
 147       return dpy->Version;
 148    case EGL_EXTENSIONS:
 149       _eglUpdateExtensionsString(dpy);
 150       return dpy->Extensions.String;
 151 #ifdef EGL_VERSION_1_2
 152    case EGL_CLIENT_APIS:
 153       _eglUpdateAPIsString(dpy);
 154       return dpy->ClientAPIs;
 155 #endif
 156    default:
 157       _eglError(EGL_BAD_PARAMETER, "eglQueryString");
 158       return NULL;
 159    }
 160 }