+/**************************************************************************
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
+ * Copyright 2010-2011 LunarG, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
/**
* Functions related to EGLDisplay.
*/
#include "eglmutex.h"
#include "egllog.h"
+/* Includes for _eglNativePlatformDetectNativeDisplay */
+#ifdef HAVE_MINCORE
+#include <unistd.h>
+#include <sys/mman.h>
+#endif
+#ifdef HAVE_WAYLAND_PLATFORM
+#include <wayland-client.h>
+#endif
+#ifdef HAVE_DRM_PLATFORM
+#include <gbm.h>
+#endif
+#ifdef HAVE_FBDEV_PLATFORM
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif
+
+
+/**
+ * Map --with-egl-platforms names to platform types.
+ */
+static const struct {
+ _EGLPlatformType platform;
+ const char *name;
+} egl_platforms[_EGL_NUM_PLATFORMS] = {
+ { _EGL_PLATFORM_WINDOWS, "gdi" },
+ { _EGL_PLATFORM_X11, "x11" },
+ { _EGL_PLATFORM_WAYLAND, "wayland" },
+ { _EGL_PLATFORM_DRM, "drm" },
+ { _EGL_PLATFORM_FBDEV, "fbdev" },
+ { _EGL_PLATFORM_ANDROID, "android" }
+};
+
/**
* Return the native platform by parsing EGL_PLATFORM.
static _EGLPlatformType
_eglGetNativePlatformFromEnv(void)
{
- /* map --with-egl-platforms names to platform types */
- static const struct {
- _EGLPlatformType platform;
- const char *name;
- } egl_platforms[_EGL_NUM_PLATFORMS] = {
- { _EGL_PLATFORM_WINDOWS, "gdi" },
- { _EGL_PLATFORM_X11, "x11" },
- { _EGL_PLATFORM_DRM, "drm" },
- { _EGL_PLATFORM_FBDEV, "fbdev" }
- };
_EGLPlatformType plat = _EGL_INVALID_PLATFORM;
const char *plat_name;
EGLint i;
}
+/**
+ * Perform validity checks on a generic pointer.
+ */
+static EGLBoolean
+_eglPointerIsDereferencable(void *p)
+{
+#ifdef HAVE_MINCORE
+ uintptr_t addr = (uintptr_t) p;
+ unsigned char valid = 0;
+ const long page_size = getpagesize();
+
+ if (p == NULL)
+ return EGL_FALSE;
+
+ /* align addr to page_size */
+ addr &= ~(page_size - 1);
+
+ if (mincore((void *) addr, page_size, &valid) < 0) {
+ _eglLog(_EGL_DEBUG, "mincore failed: %m");
+ return EGL_FALSE;
+ }
+
+ return (valid & 0x01) == 0x01;
+#else
+ return p != NULL;
+#endif
+}
+
+
+/**
+ * Try detecting native platform with the help of native display characteristcs.
+ */
+static _EGLPlatformType
+_eglNativePlatformDetectNativeDisplay(EGLNativeDisplayType nativeDisplay)
+{
+#ifdef HAVE_FBDEV_PLATFORM
+ struct stat buf;
+#endif
+
+ if (nativeDisplay == EGL_DEFAULT_DISPLAY)
+ return _EGL_INVALID_PLATFORM;
+
+#ifdef HAVE_FBDEV_PLATFORM
+ /* fbdev is the only platform that can be a file descriptor. */
+ if (fstat((intptr_t) nativeDisplay, &buf) == 0 && S_ISCHR(buf.st_mode))
+ return _EGL_PLATFORM_FBDEV;
+#endif
+
+ if (_eglPointerIsDereferencable(nativeDisplay)) {
+ void *first_pointer = *(void **) nativeDisplay;
+
+#ifdef HAVE_WAYLAND_PLATFORM
+ /* wl_display is a wl_proxy, which is a wl_object.
+ * wl_object's first element points to the interfacetype. */
+ if (first_pointer == &wl_display_interface)
+ return _EGL_PLATFORM_WAYLAND;
+#endif
+
+#ifdef HAVE_DRM_PLATFORM
+ /* gbm has a pointer to its constructor as first element. */
+ if (first_pointer == gbm_create_device)
+ return _EGL_PLATFORM_DRM;
+#endif
+
+#ifdef HAVE_X11_PLATFORM
+ /* If not matched to any other platform, fallback to x11. */
+ return _EGL_PLATFORM_X11;
+#endif
+ }
+
+ return _EGL_INVALID_PLATFORM;
+}
+
+
/**
* Return the native platform. It is the platform of the EGL native types.
*/
_EGLPlatformType
-_eglGetNativePlatform(void)
+_eglGetNativePlatform(EGLNativeDisplayType nativeDisplay)
{
static _EGLPlatformType native_platform = _EGL_INVALID_PLATFORM;
+ char *detection_method = NULL;
if (native_platform == _EGL_INVALID_PLATFORM) {
native_platform = _eglGetNativePlatformFromEnv();
- if (native_platform == _EGL_INVALID_PLATFORM)
- native_platform = _EGL_NATIVE_PLATFORM;
+ detection_method = "environment overwrite";
+ if (native_platform == _EGL_INVALID_PLATFORM) {
+ native_platform = _eglNativePlatformDetectNativeDisplay(nativeDisplay);
+ detection_method = "autodetected";
+ if (native_platform == _EGL_INVALID_PLATFORM) {
+ native_platform = _EGL_NATIVE_PLATFORM;
+ detection_method = "build-time configuration";
+ }
+ }
}
+ if (detection_method != NULL)
+ _eglLog(_EGL_DEBUG, "Native platform type: %s (%s)",
+ egl_platforms[native_platform].name, detection_method);
+
return native_platform;
}
projects / mesa.git / blobdiff