[Mesa-dev] [PATCH 3/8] gallium: add a stream argument to create_query
Marek Olšák
maraeo at gmail.com
Fri Jun 27 07:54:02 PDT 2014
FWIW, I prefer adding an "index" to create_query.
Marek
On Fri, Jun 27, 2014 at 4:11 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> On Fri, Jun 27, 2014 at 9:56 AM, Roland Scheidegger <sroland at vmware.com> wrote:
>> Am 27.06.2014 06:40, schrieb Ilia Mirkin:
>>> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
>>> ---
>>> src/gallium/auxiliary/hud/hud_driver_query.c | 6 +++---
>>> src/gallium/drivers/freedreno/freedreno_query.c | 2 +-
>>> src/gallium/drivers/galahad/glhd_context.c | 6 ++++--
>>> src/gallium/drivers/i915/i915_query.c | 3 ++-
>>> src/gallium/drivers/identity/id_context.c | 6 ++++--
>>> src/gallium/drivers/ilo/ilo_query.c | 2 +-
>>> src/gallium/drivers/llvmpipe/lp_query.c | 3 ++-
>>> src/gallium/drivers/noop/noop_pipe.c | 2 +-
>>> src/gallium/drivers/nouveau/nv30/nv30_query.c | 2 +-
>>> src/gallium/drivers/nouveau/nv50/nv50_query.c | 2 +-
>>> src/gallium/drivers/nouveau/nv50/nv50_state.c | 2 +-
>>> src/gallium/drivers/nouveau/nvc0/nvc0_query.c | 2 +-
>>> src/gallium/drivers/nouveau/nvc0/nvc0_state.c | 2 +-
>>> src/gallium/drivers/r300/r300_query.c | 3 ++-
>>> src/gallium/drivers/radeon/r600_query.c | 2 +-
>>> src/gallium/drivers/rbug/rbug_context.c | 6 ++++--
>>> src/gallium/drivers/softpipe/sp_query.c | 3 ++-
>>> src/gallium/drivers/svga/svga_pipe_query.c | 4 +++-
>>> src/gallium/drivers/trace/tr_context.c | 6 ++++--
>>> src/gallium/include/pipe/p_context.h | 3 ++-
>>> src/gallium/state_trackers/clover/core/timestamp.cpp | 2 +-
>>> src/gallium/tests/graw/occlusion-query.c | 4 ++--
>>> src/gallium/tools/trace/dump_state.py | 2 +-
>>> src/mesa/state_tracker/st_cb_queryobj.c | 6 +++---
>>> 24 files changed, 48 insertions(+), 33 deletions(-)
>>>
>>> diff --git a/src/gallium/auxiliary/hud/hud_driver_query.c b/src/gallium/auxiliary/hud/hud_driver_query.c
>>> index 0f52e18..b48708c 100644
>>> --- a/src/gallium/auxiliary/hud/hud_driver_query.c
>>> +++ b/src/gallium/auxiliary/hud/hud_driver_query.c
>>> @@ -90,7 +90,7 @@ query_new_value(struct hud_graph *gr)
>>> NUM_QUERIES);
>>> pipe->destroy_query(pipe, info->query[info->head]);
>>> info->query[info->head] =
>>> - pipe->create_query(pipe, info->query_type);
>>> + pipe->create_query(pipe, info->query_type, 0);
>>> }
>>> else {
>>> /* the last query is busy, we need to add a new one we can use
>>> @@ -98,7 +98,7 @@ query_new_value(struct hud_graph *gr)
>>> info->head = (info->head+1) % NUM_QUERIES;
>>> if (!info->query[info->head]) {
>>> info->query[info->head] =
>>> - pipe->create_query(pipe, info->query_type);
>>> + pipe->create_query(pipe, info->query_type, 0);
>>> }
>>> }
>>> break;
>>> @@ -119,7 +119,7 @@ query_new_value(struct hud_graph *gr)
>>> else {
>>> /* initialize */
>>> info->last_time = now;
>>> - info->query[info->head] = pipe->create_query(pipe, info->query_type);
>>> + info->query[info->head] = pipe->create_query(pipe, info->query_type, 0);
>>> pipe->begin_query(pipe, info->query[info->head]);
>>> }
>>> }
>>> diff --git a/src/gallium/drivers/freedreno/freedreno_query.c b/src/gallium/drivers/freedreno/freedreno_query.c
>>> index 8753a4b..952bb81 100644
>>> --- a/src/gallium/drivers/freedreno/freedreno_query.c
>>> +++ b/src/gallium/drivers/freedreno/freedreno_query.c
>>> @@ -40,7 +40,7 @@
>>> */
>>>
>>> static struct pipe_query *
>>> -fd_create_query(struct pipe_context *pctx, unsigned query_type)
>>> +fd_create_query(struct pipe_context *pctx, unsigned query_type, unsigned stream)
>>> {
>>> struct fd_context *ctx = fd_context(pctx);
>>> struct fd_query *q;
>>> diff --git a/src/gallium/drivers/galahad/glhd_context.c b/src/gallium/drivers/galahad/glhd_context.c
>>> index 2e61e59..3f58b21 100644
>>> --- a/src/gallium/drivers/galahad/glhd_context.c
>>> +++ b/src/gallium/drivers/galahad/glhd_context.c
>>> @@ -63,7 +63,8 @@ galahad_context_draw_vbo(struct pipe_context *_pipe,
>>>
>>> static struct pipe_query *
>>> galahad_context_create_query(struct pipe_context *_pipe,
>>> - unsigned query_type)
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct galahad_context *glhd_pipe = galahad_context(_pipe);
>>> struct pipe_context *pipe = glhd_pipe->pipe;
>>> @@ -79,7 +80,8 @@ galahad_context_create_query(struct pipe_context *_pipe,
>>> }
>>>
>>> return pipe->create_query(pipe,
>>> - query_type);
>>> + query_type,
>>> + stream);
>>> }
>>>
>>> static void
>>> diff --git a/src/gallium/drivers/i915/i915_query.c b/src/gallium/drivers/i915/i915_query.c
>>> index 0efceb1..e05c0b9 100644
>>> --- a/src/gallium/drivers/i915/i915_query.c
>>> +++ b/src/gallium/drivers/i915/i915_query.c
>>> @@ -40,7 +40,8 @@ struct i915_query
>>> };
>>>
>>> static struct pipe_query *i915_create_query(struct pipe_context *ctx,
>>> - unsigned query_type)
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct i915_query *query = CALLOC_STRUCT( i915_query );
>>>
>>> diff --git a/src/gallium/drivers/identity/id_context.c b/src/gallium/drivers/identity/id_context.c
>>> index 00414b8..31f8e60 100644
>>> --- a/src/gallium/drivers/identity/id_context.c
>>> +++ b/src/gallium/drivers/identity/id_context.c
>>> @@ -57,13 +57,15 @@ identity_draw_vbo(struct pipe_context *_pipe,
>>>
>>> static struct pipe_query *
>>> identity_create_query(struct pipe_context *_pipe,
>>> - unsigned query_type)
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct identity_context *id_pipe = identity_context(_pipe);
>>> struct pipe_context *pipe = id_pipe->pipe;
>>>
>>> return pipe->create_query(pipe,
>>> - query_type);
>>> + query_type,
>>> + stream);
>>> }
>>>
>>> static void
>>> diff --git a/src/gallium/drivers/ilo/ilo_query.c b/src/gallium/drivers/ilo/ilo_query.c
>>> index 71bcc0f..cb02bf3 100644
>>> --- a/src/gallium/drivers/ilo/ilo_query.c
>>> +++ b/src/gallium/drivers/ilo/ilo_query.c
>>> @@ -70,7 +70,7 @@ ilo_query(struct pipe_query *query)
>>> }
>>>
>>> static struct pipe_query *
>>> -ilo_create_query(struct pipe_context *pipe, unsigned query_type)
>>> +ilo_create_query(struct pipe_context *pipe, unsigned query_type, unsigned stream)
>>> {
>>> struct ilo_query *q;
>>>
>>> diff --git a/src/gallium/drivers/llvmpipe/lp_query.c b/src/gallium/drivers/llvmpipe/lp_query.c
>>> index 2bc9c1a..0ee168f 100644
>>> --- a/src/gallium/drivers/llvmpipe/lp_query.c
>>> +++ b/src/gallium/drivers/llvmpipe/lp_query.c
>>> @@ -50,7 +50,8 @@ static struct llvmpipe_query *llvmpipe_query( struct pipe_query *p )
>>>
>>> static struct pipe_query *
>>> llvmpipe_create_query(struct pipe_context *pipe,
>>> - unsigned type)
>>> + unsigned type,
>>> + unsigned stream)
>>> {
>>> struct llvmpipe_query *pq;
>>>
>>> diff --git a/src/gallium/drivers/noop/noop_pipe.c b/src/gallium/drivers/noop/noop_pipe.c
>>> index 27197a5..44dbe1c 100644
>>> --- a/src/gallium/drivers/noop/noop_pipe.c
>>> +++ b/src/gallium/drivers/noop/noop_pipe.c
>>> @@ -46,7 +46,7 @@ struct noop_pipe_screen {
>>> struct noop_query {
>>> unsigned query;
>>> };
>>> -static struct pipe_query *noop_create_query(struct pipe_context *ctx, unsigned query_type)
>>> +static struct pipe_query *noop_create_query(struct pipe_context *ctx, unsigned query_type, unsigned stream)
>>> {
>>> struct noop_query *query = CALLOC_STRUCT(noop_query);
>>>
>>> diff --git a/src/gallium/drivers/nouveau/nv30/nv30_query.c b/src/gallium/drivers/nouveau/nv30/nv30_query.c
>>> index 01b3817..bc7e764 100644
>>> --- a/src/gallium/drivers/nouveau/nv30/nv30_query.c
>>> +++ b/src/gallium/drivers/nouveau/nv30/nv30_query.c
>>> @@ -105,7 +105,7 @@ nv30_query(struct pipe_query *pipe)
>>> }
>>>
>>> static struct pipe_query *
>>> -nv30_query_create(struct pipe_context *pipe, unsigned type)
>>> +nv30_query_create(struct pipe_context *pipe, unsigned type, unsigned stream)
>>> {
>>> struct nv30_query *q = CALLOC_STRUCT(nv30_query);
>>> if (!q)
>>> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_query.c b/src/gallium/drivers/nouveau/nv50/nv50_query.c
>>> index 6a17139..8cac38f 100644
>>> --- a/src/gallium/drivers/nouveau/nv50/nv50_query.c
>>> +++ b/src/gallium/drivers/nouveau/nv50/nv50_query.c
>>> @@ -96,7 +96,7 @@ nv50_query_destroy(struct pipe_context *pipe, struct pipe_query *pq)
>>> }
>>>
>>> static struct pipe_query *
>>> -nv50_query_create(struct pipe_context *pipe, unsigned type)
>>> +nv50_query_create(struct pipe_context *pipe, unsigned type, unsigned stream)
>>> {
>>> struct nv50_context *nv50 = nv50_context(pipe);
>>> struct nv50_query *q;
>>> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_state.c b/src/gallium/drivers/nouveau/nv50/nv50_state.c
>>> index d0bc7ff..915ee26 100644
>>> --- a/src/gallium/drivers/nouveau/nv50/nv50_state.c
>>> +++ b/src/gallium/drivers/nouveau/nv50/nv50_state.c
>>> @@ -1028,7 +1028,7 @@ nv50_so_target_create(struct pipe_context *pipe,
>>>
>>> if (nouveau_context(pipe)->screen->class_3d >= NVA0_3D_CLASS) {
>>> targ->pq = pipe->create_query(pipe,
>>> - NVA0_QUERY_STREAM_OUTPUT_BUFFER_OFFSET);
>>> + NVA0_QUERY_STREAM_OUTPUT_BUFFER_OFFSET, 0);
>>> if (!targ->pq) {
>>> FREE(targ);
>>> return NULL;
>>> diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_query.c b/src/gallium/drivers/nouveau/nvc0/nvc0_query.c
>>> index 856f685..5ed22f2 100644
>>> --- a/src/gallium/drivers/nouveau/nvc0/nvc0_query.c
>>> +++ b/src/gallium/drivers/nouveau/nvc0/nvc0_query.c
>>> @@ -108,7 +108,7 @@ nvc0_query_destroy(struct pipe_context *pipe, struct pipe_query *pq)
>>> }
>>>
>>> static struct pipe_query *
>>> -nvc0_query_create(struct pipe_context *pipe, unsigned type)
>>> +nvc0_query_create(struct pipe_context *pipe, unsigned type, unsigned stream)
>>> {
>>> struct nvc0_context *nvc0 = nvc0_context(pipe);
>>> struct nvc0_query *q;
>>> diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_state.c b/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
>>> index c92aaac..ef9d479 100644
>>> --- a/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
>>> +++ b/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
>>> @@ -1022,7 +1022,7 @@ nvc0_so_target_create(struct pipe_context *pipe,
>>> if (!targ)
>>> return NULL;
>>>
>>> - targ->pq = pipe->create_query(pipe, NVC0_QUERY_TFB_BUFFER_OFFSET);
>>> + targ->pq = pipe->create_query(pipe, NVC0_QUERY_TFB_BUFFER_OFFSET, 0);
>>> if (!targ->pq) {
>>> FREE(targ);
>>> return NULL;
>>> diff --git a/src/gallium/drivers/r300/r300_query.c b/src/gallium/drivers/r300/r300_query.c
>>> index fbf44c6..05b54b9 100644
>>> --- a/src/gallium/drivers/r300/r300_query.c
>>> +++ b/src/gallium/drivers/r300/r300_query.c
>>> @@ -30,7 +30,8 @@
>>> #include <stdio.h>
>>>
>>> static struct pipe_query *r300_create_query(struct pipe_context *pipe,
>>> - unsigned query_type)
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct r300_context *r300 = r300_context(pipe);
>>> struct r300_screen *r300screen = r300->screen;
>>> diff --git a/src/gallium/drivers/radeon/r600_query.c b/src/gallium/drivers/radeon/r600_query.c
>>> index c439441..ac126ea 100644
>>> --- a/src/gallium/drivers/radeon/r600_query.c
>>> +++ b/src/gallium/drivers/radeon/r600_query.c
>>> @@ -346,7 +346,7 @@ static void r600_emit_query_predication(struct r600_common_context *ctx, struct
>>> }
>>> }
>>>
>>> -static struct pipe_query *r600_create_query(struct pipe_context *ctx, unsigned query_type)
>>> +static struct pipe_query *r600_create_query(struct pipe_context *ctx, unsigned query_type, unsigned stream)
>>> {
>>> struct r600_common_context *rctx = (struct r600_common_context *)ctx;
>>> struct r600_query *query;
>>> diff --git a/src/gallium/drivers/rbug/rbug_context.c b/src/gallium/drivers/rbug/rbug_context.c
>>> index 2b99ddd..91254f0 100644
>>> --- a/src/gallium/drivers/rbug/rbug_context.c
>>> +++ b/src/gallium/drivers/rbug/rbug_context.c
>>> @@ -134,14 +134,16 @@ rbug_draw_vbo(struct pipe_context *_pipe, const struct pipe_draw_info *info)
>>>
>>> static struct pipe_query *
>>> rbug_create_query(struct pipe_context *_pipe,
>>> - unsigned query_type)
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct rbug_context *rb_pipe = rbug_context(_pipe);
>>> struct pipe_context *pipe = rb_pipe->pipe;
>>>
>>> pipe_mutex_lock(rb_pipe->call_mutex);
>>> return pipe->create_query(pipe,
>>> - query_type);
>>> + query_type,
>>> + stream);
>>> pipe_mutex_unlock(rb_pipe->call_mutex);
>>> }
>>>
>>> diff --git a/src/gallium/drivers/softpipe/sp_query.c b/src/gallium/drivers/softpipe/sp_query.c
>>> index 8822370..647da8b 100644
>>> --- a/src/gallium/drivers/softpipe/sp_query.c
>>> +++ b/src/gallium/drivers/softpipe/sp_query.c
>>> @@ -53,7 +53,8 @@ static struct softpipe_query *softpipe_query( struct pipe_query *p )
>>>
>>> static struct pipe_query *
>>> softpipe_create_query(struct pipe_context *pipe,
>>> - unsigned type)
>>> + unsigned type,
>>> + unsigned stream)
>>> {
>>> struct softpipe_query* sq;
>>>
>>> diff --git a/src/gallium/drivers/svga/svga_pipe_query.c b/src/gallium/drivers/svga/svga_pipe_query.c
>>> index 0283aa9..76d485b 100644
>>> --- a/src/gallium/drivers/svga/svga_pipe_query.c
>>> +++ b/src/gallium/drivers/svga/svga_pipe_query.c
>>> @@ -74,7 +74,9 @@ svga_get_query_result(struct pipe_context *pipe,
>>>
>>>
>>> static struct pipe_query *
>>> -svga_create_query( struct pipe_context *pipe, unsigned query_type )
>>> +svga_create_query(struct pipe_context *pipe,
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct svga_context *svga = svga_context( pipe );
>>> struct svga_screen *svgascreen = svga_screen(pipe->screen);
>>> diff --git a/src/gallium/drivers/trace/tr_context.c b/src/gallium/drivers/trace/tr_context.c
>>> index 3e99598..35301ab 100644
>>> --- a/src/gallium/drivers/trace/tr_context.c
>>> +++ b/src/gallium/drivers/trace/tr_context.c
>>> @@ -127,7 +127,8 @@ trace_context_draw_vbo(struct pipe_context *_pipe,
>>>
>>> static INLINE struct pipe_query *
>>> trace_context_create_query(struct pipe_context *_pipe,
>>> - unsigned query_type)
>>> + unsigned query_type,
>>> + unsigned stream)
>>> {
>>> struct trace_context *tr_ctx = trace_context(_pipe);
>>> struct pipe_context *pipe = tr_ctx->pipe;
>>> @@ -137,8 +138,9 @@ trace_context_create_query(struct pipe_context *_pipe,
>>>
>>> trace_dump_arg(ptr, pipe);
>>> trace_dump_arg(query_type, query_type);
>>> + trace_dump_arg(int, stream);
>>>
>>> - query = pipe->create_query(pipe, query_type);
>>> + query = pipe->create_query(pipe, query_type, stream);
>>>
>>> trace_dump_ret(ptr, query);
>>>
>>> diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
>>> index bc43530..5b7532c 100644
>>> --- a/src/gallium/include/pipe/p_context.h
>>> +++ b/src/gallium/include/pipe/p_context.h
>>> @@ -109,7 +109,8 @@ struct pipe_context {
>>> */
>>> /*@{*/
>>> struct pipe_query *(*create_query)( struct pipe_context *pipe,
>>> - unsigned query_type );
>>> + unsigned query_type,
>>> + unsigned stream );
>>>
>>> void (*destroy_query)(struct pipe_context *pipe,
>>> struct pipe_query *q);
>>> diff --git a/src/gallium/state_trackers/clover/core/timestamp.cpp b/src/gallium/state_trackers/clover/core/timestamp.cpp
>>> index f168d61..481c4f9 100644
>>> --- a/src/gallium/state_trackers/clover/core/timestamp.cpp
>>> +++ b/src/gallium/state_trackers/clover/core/timestamp.cpp
>>> @@ -29,7 +29,7 @@ using namespace clover;
>>>
>>> timestamp::query::query(command_queue &q) :
>>> q(q),
>>> - _query(q.pipe->create_query(q.pipe, PIPE_QUERY_TIMESTAMP)) {
>>> + _query(q.pipe->create_query(q.pipe, PIPE_QUERY_TIMESTAMP, 0)) {
>>> }
>>>
>>> timestamp::query::query(query &&other) :
>>> diff --git a/src/gallium/tests/graw/occlusion-query.c b/src/gallium/tests/graw/occlusion-query.c
>>> index f5227e3..d03934f 100644
>>> --- a/src/gallium/tests/graw/occlusion-query.c
>>> +++ b/src/gallium/tests/graw/occlusion-query.c
>>> @@ -169,8 +169,8 @@ draw(void)
>>> PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
>>> &clear_color, 1.0, 0);
>>>
>>> - q1 = info.ctx->create_query(info.ctx, PIPE_QUERY_OCCLUSION_COUNTER);
>>> - q2 = info.ctx->create_query(info.ctx, PIPE_QUERY_OCCLUSION_COUNTER);
>>> + q1 = info.ctx->create_query(info.ctx, PIPE_QUERY_OCCLUSION_COUNTER, 0);
>>> + q2 = info.ctx->create_query(info.ctx, PIPE_QUERY_OCCLUSION_COUNTER, 0);
>>>
>>> /* draw first, large object */
>>> set_vertices(obj1_vertices, sizeof(obj1_vertices));
>>> diff --git a/src/gallium/tools/trace/dump_state.py b/src/gallium/tools/trace/dump_state.py
>>> index 8bb29e7..0fd1c41 100755
>>> --- a/src/gallium/tools/trace/dump_state.py
>>> +++ b/src/gallium/tools/trace/dump_state.py
>>> @@ -665,7 +665,7 @@ class Context(Dispatcher):
>>> def surface_destroy(self, surface):
>>> self.interpreter.unregister_object(surface)
>>>
>>> - def create_query(self, query_type):
>>> + def create_query(self, query_type, stream):
>>> return query_type
>>>
>>> def destroy_query(self, query):
>>> diff --git a/src/mesa/state_tracker/st_cb_queryobj.c b/src/mesa/state_tracker/st_cb_queryobj.c
>>> index 78a7370..1aaa322 100644
>>> --- a/src/mesa/state_tracker/st_cb_queryobj.c
>>> +++ b/src/mesa/state_tracker/st_cb_queryobj.c
>>> @@ -132,13 +132,13 @@ st_BeginQuery(struct gl_context *ctx, struct gl_query_object *q)
>>> type == PIPE_QUERY_TIMESTAMP) {
>>> /* Determine time elapsed by emitting two timestamp queries. */
>>> if (!stq->pq_begin) {
>>> - stq->pq_begin = pipe->create_query(pipe, type);
>>> + stq->pq_begin = pipe->create_query(pipe, type, 0);
>>> stq->type = type;
>>> }
>>> pipe->end_query(pipe, stq->pq_begin);
>>> } else {
>>> if (!stq->pq) {
>>> - stq->pq = pipe->create_query(pipe, type);
>>> + stq->pq = pipe->create_query(pipe, type, 0);
>>> stq->type = type;
>>> }
>>> if (stq->pq) {
>>> @@ -164,7 +164,7 @@ st_EndQuery(struct gl_context *ctx, struct gl_query_object *q)
>>> if ((q->Target == GL_TIMESTAMP ||
>>> q->Target == GL_TIME_ELAPSED) &&
>>> !stq->pq) {
>>> - stq->pq = pipe->create_query(pipe, PIPE_QUERY_TIMESTAMP);
>>> + stq->pq = pipe->create_query(pipe, PIPE_QUERY_TIMESTAMP, 0);
>>> stq->type = PIPE_QUERY_TIMESTAMP;
>>> }
>>>
>>>
>>
>> 1-2 look good - I guess there wouldn't be any point to have different
>> emit/endprim with and without the stream index like d3d11 does.
>>
>> This one though looks ugly, a stream parameter added to all queries.
>> I think either the parameter should be more generic (like "index") so it
>> potentially applies to more query types, though I don't think there's
>> any where it actually could be used (though unlike d3d11 we actually
>> have 3 as apart from the PIPE_QUERY_SO_STATISTICS there's the separate
>> PIPE_QUERY_PRIMITIVES_GENERATED / PIPE_QUERY_PRIMITIVES_EMITTED). The
>> other possibility would be to just add different queries - I don't think
>> anyone can do nor are there any plans to support more than 4 streams
>> (this is what d3d11 does).
>
> I have no preference between the approaches. Can you/Brian/Marek come
> to an agreement, and I'll do it whatever way that is?
>
> -ilia
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