egl: add EGL_EXT_device_drm support

Add implementation based around the drmDevice API. As such it's only
available only when building with libdrm. With the latter already a
requirement when using !SW code paths in the platform code.

Note: the current code will work if a device is hot-plugged. Yet
hot-unplugged is not implemented, since I have no ways of testing it.

v2:
 - ddd some _eglDeviceSupports checks
 - require DRM_NODE_RENDER
 - add _eglGetDRMDeviceRenderNode helper

v3:
 - flip inverted asserts (Mathias)

Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Mathias Fröhlich <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/egl/main/egldevice.h b/src/egl/main/egldevice.h
index 74b5ddeee5c..ddcdcd17f5a 100644
--- a/src/egl/main/egldevice.h
+++ b/src/egl/main/egldevice.h
@@ -60,6 +60,7 @@ _eglAddDevice(int fd, bool software);
 
 enum _egl_device_extension {
    _EGL_DEVICE_SOFTWARE,
+   _EGL_DEVICE_DRM,
 };
 
 typedef enum _egl_device_extension _EGLDeviceExtension;
@@ -67,6 +68,9 @@ typedef enum _egl_device_extension _EGLDeviceExtension;
 EGLBoolean
 _eglDeviceSupports(_EGLDevice *dev, _EGLDeviceExtension ext);
 
+const char *
+_eglGetDRMDeviceRenderNode(_EGLDevice *dev);
+
 EGLBoolean
 _eglQueryDeviceAttribEXT(_EGLDevice *dev, EGLint attribute,
                          EGLAttrib *value);