Mesa (master): i965: Enable the ARB_transform_feedback3 extension on Gen7+.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: c4ec0ad8a90c2023cb77e578d39dddb0cddeada9
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c4ec0ad8a90c2023cb77e578d39dddb0cddeada9

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sat Oct 26 13:20:02 2013 -0700

i965: Enable the ARB_transform_feedback3 extension on Gen7+.

This extension is written a bit strangely.  Although it introduces the
concept of multiple transform feedback streams, it doesn't actually
provide more than a single stream.

The ARB_gpu_shader5 extension is what introduces the ability to write to
streams other than stream #0 and increases the required number of streams.

Since we don't yet support ARB_gpu_shader5, we can safely enable
ARB_transform_feedback3 even though we only support a single stream.
This does provide some useful functionality: applications can now use
more than one interleaved transform feedback buffer.

v2: Only expose the extension if ARB_transform_feedback2 is also
    available, to avoid confusing applications (suggested by Ian).

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/mesa/drivers/dri/i965/intel_extensions.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/intel_extensions.c b/src/mesa/drivers/dri/i965/intel_extensions.c
index 337e7e8..31e15bb 100644
--- a/src/mesa/drivers/dri/i965/intel_extensions.c
+++ b/src/mesa/drivers/dri/i965/intel_extensions.c
@@ -230,6 +230,7 @@ intelInitExtensions(struct gl_context *ctx)
       ctx->Extensions.ARB_conservative_depth = true;
       if (can_do_pipelined_register_writes(brw)) {
          ctx->Extensions.ARB_transform_feedback2 = true;
+         ctx->Extensions.ARB_transform_feedback3 = true;
       }
    }