[PATCH] compositor: Set EGL_PLATFORM env variable for each backend.

[Egbert Eich]

I may have missed something, but - since the Wayland compositor 
already picks a platform backend, opens a connection and initializes the
backend specific display data structure it doesn't make sense
to let egl pick a platform. If it picks a different one the 
display specific data structure will most likely not match.
Thus determine the platform in the Wayland rendering backend by setting
the EGL_PLATFORM env variable.
For the client any other platform than 'wayland' doesn't seem to make
sense.
I'm not sure if I've got the the platform ofr openfwd right.

Signed-off-by: Egbert Eich <eich at freedesktop.org>
---
 clients/window.c                |    1 +
 compositor/compositor-drm.c     |    1 +
 compositor/compositor-openwfd.c |    1 +
 compositor/compositor-wayland.c |    1 +
 compositor/compositor-x11.c     |    1 +
 5 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/clients/window.c b/clients/window.c
index 9d0b753..8c3f8d2 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -1757,6 +1757,7 @@ init_egl(struct display *d)
 		EGL_NONE
 	};
 
+	setenv("EGL_PLATFORM", "wayland", 1);
 	d->dpy = eglGetDisplay(d->display);
 	if (!eglInitialize(d->dpy, &major, &minor)) {
 		fprintf(stderr, "failed to initialize display\n");
diff --git a/compositor/compositor-drm.c b/compositor/compositor-drm.c
index 4897b38..9fc5b49 100644
--- a/compositor/compositor-drm.c
+++ b/compositor/compositor-drm.c
@@ -269,6 +269,7 @@ init_egl(struct drm_compositor *ec, struct udev_device *device)
 		return -1;
 	}
 
+	setenv("EGL_PLATFORM", "drm", 1);
 	ec->drm.fd = fd;
 	ec->base.display = eglGetDisplay(FD_TO_EGL_NATIVE_DPY(ec->drm.fd));
 	if (ec->base.display == NULL) {
diff --git a/compositor/compositor-openwfd.c b/compositor/compositor-openwfd.c
index 0ddde52..ccd3dce 100644
--- a/compositor/compositor-openwfd.c
+++ b/compositor/compositor-openwfd.c
@@ -118,6 +118,7 @@ init_egl(struct wfd_compositor *ec)
 		return -1;
 
 	ec->wfd_fd = fd;
+	setenv("EGL_PLATFORM", "drm", 1);
 	ec->base.display = eglGetDisplay(FD_TO_EGL_NATIVE_DPY(ec->wfd_fd));
 	if (ec->base.display == NULL) {
 		fprintf(stderr, "failed to create display\n");
diff --git a/compositor/compositor-wayland.c b/compositor/compositor-wayland.c
index 1a53e8d..6cd02ed 100644
--- a/compositor/compositor-wayland.c
+++ b/compositor/compositor-wayland.c
@@ -111,6 +111,7 @@ wayland_compositor_init_egl(struct wayland_compositor *c)
 		EGL_NONE
 	};
 
+	setenv("EGL_PLATFORM", "wayland", 1);
 	c->base.display = eglGetDisplay(c->parent.display);
 	if (c->base.display == NULL) {
 		fprintf(stderr, "failed to create display\n");
diff --git a/compositor/compositor-x11.c b/compositor/compositor-x11.c
index ac31881..3517fad 100644
--- a/compositor/compositor-x11.c
+++ b/compositor/compositor-x11.c
@@ -113,6 +113,7 @@ x11_compositor_init_egl(struct x11_compositor *c)
 		EGL_NONE
 	};
 
+	setenv("EGL_PLATFORM", "x11", 1);
 	c->base.display = eglGetDisplay(c->dpy);
 	if (c->base.display == NULL) {
 		fprintf(stderr, "failed to create display\n");
-- 
1.7.3.4