[cogl/fosdem-2012] kms: Adds api to get at the drm file descriptor

[Robert Bragg <rbragg src gnome org>]

commit ddd0acc36c492d96a6fb92238813e19736469000
Author: Robert Bragg <robert linux intel com>
Date:   Mon Jan 23 15:37:51 2012 +0000

    kms: Adds api to get at the drm file descriptor
    
    This adds a cogl_kms_renderer_get_drm_fd() function that lets developers
    access the drm file descriptor being used for controlling the kernel
    mode setting.

 cogl/Makefile.am                  |    2 +
 cogl/cogl-kms-renderer.h          |   51 +++++++++++++++++++++++++++++++++++++
 cogl/cogl.h                       |    3 ++
 cogl/winsys/cogl-winsys-egl-kms.c |   15 +++++++++++
 4 files changed, 71 insertions(+), 0 deletions(-)
---
diff --git a/cogl/Makefile.am b/cogl/Makefile.am
index 0c223b8..8cfe317 100644
--- a/cogl/Makefile.am
+++ b/cogl/Makefile.am
@@ -397,6 +397,8 @@ cogl_sources_c += \
 	$(srcdir)/winsys/cogl-winsys-egl-wayland-private.h
 endif
 if SUPPORT_EGL_PLATFORM_KMS
+cogl_public_h += \
+	$(srcdir)/cogl-kms-renderer.h
 cogl_sources_c += \
 	$(srcdir)/winsys/cogl-winsys-egl-kms.c \
 	$(srcdir)/winsys/cogl-winsys-egl-kms-private.h
diff --git a/cogl/cogl-kms-renderer.h b/cogl/cogl-kms-renderer.h
new file mode 100644
index 0000000..0458ff3
--- /dev/null
+++ b/cogl/cogl-kms-renderer.h
@@ -0,0 +1,51 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2011 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <cogl/cogl.h> can be included directly."
+#endif
+
+#ifndef __COGL_KMS_RENDERER_H__
+#define __COGL_KMS_RENDERER_H__
+
+#include <cogl/cogl-types.h>
+#include <cogl/cogl-renderer.h>
+
+G_BEGIN_DECLS
+
+/**
+ * cogl_kms_renderer_get_drm_fd:
+ * @renderer: A #CoglRenderer
+ *
+ * Queries the file descriptor Cogl is using internally for communicating with
+ * the drm driver.
+ *
+ * Return value: The drm filedescriptor or -1 if no drm filedesriptor has been
+ *               opened by Cogl.
+ * Stability: unstable
+ */
+int
+cogl_kms_renderer_get_drm_fd (CoglRenderer *renderer);
+
+G_END_DECLS
+#endif /* __COGL_KMS_RENDERER_H__ */
diff --git a/cogl/cogl.h b/cogl/cogl.h
index 5a8691b..ab46eeb 100644
--- a/cogl/cogl.h
+++ b/cogl/cogl.h
@@ -98,6 +98,9 @@ typedef struct _CoglFramebuffer CoglFramebuffer;
 #include <cogl/cogl-framebuffer.h>
 #include <cogl/cogl-onscreen.h>
 #include <cogl/cogl-poll.h>
+#if defined (COGL_HAS_EGL_PLATFORM_KMS_SUPPORT)
+#include <cogl/cogl-kms-renderer.h>
+#endif
 #if defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
 #include <cogl/cogl-wayland-renderer.h>
 #endif
diff --git a/cogl/winsys/cogl-winsys-egl-kms.c b/cogl/winsys/cogl-winsys-egl-kms.c
index b48faa3..58de181 100644
--- a/cogl/winsys/cogl-winsys-egl-kms.c
+++ b/cogl/winsys/cogl-winsys-egl-kms.c
@@ -649,3 +649,18 @@ _cogl_winsys_egl_kms_get_vtable (void)
 
   return &vtable;
 }
+
+int
+cogl_kms_renderer_get_drm_fd (CoglRenderer *renderer)
+{
+  _COGL_RETURN_VAL_IF_FAIL (cogl_is_renderer (renderer), -1);
+
+  if (renderer->connected)
+    {
+      CoglRendererEGL *egl_renderer = renderer->winsys;
+      CoglRendererKMS *kms_renderer = egl_renderer->platform;
+      return kms_renderer->fd;
+    }
+  else
+    return -1;
+}