egl,dri: Propagate context priority hint to driver->CreateContext

Jump through the layers of abstraction between egl and dri in order to
feed the context priority attribute through to the backend. This
requires us to read the value from the base _egl_context, convert it to
a DRI attribute, parse it again in the generic context creator before
passing it to the driver as a function parameter.

In order to not require us to pass back the actual value of the context
priority after creation, we impose that drivers should report the
available set of priorities during screen setup (and then they may chose
to fail if given an invalid value as that should have been checked at
the user boundary.)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Ben Widawsky <ben@bwidawsk.net> # i915/i965
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index 7ed0169a98..98402eae05 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -1100,6 +1100,12 @@ struct __DRIdri2LoaderExtensionRec {
 #define __DRI_CTX_RESET_LOSE_CONTEXT		1
 /*@}*/
 
+#define __DRI_CTX_ATTRIB_PRIORITY		4
+
+#define __DRI_CTX_PRIORITY_LOW			0
+#define __DRI_CTX_PRIORITY_MEDIUM		1
+#define __DRI_CTX_PRIORITY_HIGH			2
+
 /**
  * \name Reasons that __DRIdri2Extension::createContextAttribs might fail
  */