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.
I believe this extension can be enabled independently from
ARB_transform_feedback2, so I've enabled it universally on Gen7+.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/intel_extensions.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/mesa/drivers/dri/i965/intel_extensions.c
b/src/mesa/drivers/dri/i965/intel_extensions.c
index 0c6ed02..e08d93a 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;
}
if (ctx->API == API_OPENGL_CORE)
--
1.8.3.2
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