src/gallium/drivers/virgl/virgl_streamout.c

/*
 * Copyright 2014, 2015 Red Hat.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "util/u_inlines.h"
#include "util/u_memory.h"
#include "virgl_context.h"
#include "virgl_encode.h"
#include "virtio-gpu/virgl_protocol.h"
#include "virgl_resource.h"

static struct pipe_stream_output_target *virgl_create_so_target(
   struct pipe_context *ctx,
   struct pipe_resource *buffer,
   unsigned buffer_offset,
   unsigned buffer_size)
{
   struct virgl_context *vctx = virgl_context(ctx);
   struct virgl_resource *res = virgl_resource(buffer);
   struct virgl_so_target *t = CALLOC_STRUCT(virgl_so_target);
   uint32_t handle;

   if (!t)
      return NULL;
   handle = virgl_object_assign_handle();

   t->base.reference.count = 1;
   t->base.context = ctx;
   pipe_resource_reference(&t->base.buffer, buffer);
   t->base.buffer_offset = buffer_offset;
   t->base.buffer_size = buffer_size;
   t->handle = handle;

   res->bind_history |= PIPE_BIND_STREAM_OUTPUT;
   util_range_add(&res->b, &res->valid_buffer_range, buffer_offset,
                  buffer_offset + buffer_size);
   virgl_resource_dirty(res, 0);

   virgl_encoder_create_so_target(vctx, handle, res, buffer_offset, buffer_size);
   return &t->base;
}

static void virgl_destroy_so_target(struct pipe_context *ctx,
                                   struct pipe_stream_output_target *target)
{
   struct virgl_context *vctx = virgl_context(ctx);
   struct virgl_so_target *t = virgl_so_target(target);

   pipe_resource_reference(&t->base.buffer, NULL);
   virgl_encode_delete_object(vctx, t->handle, VIRGL_OBJECT_STREAMOUT_TARGET);
   FREE(t);
}

static void virgl_set_so_targets(struct pipe_context *ctx,
                                unsigned num_targets,
                                struct pipe_stream_output_target **targets,
                                const unsigned *offset)
{
   struct virgl_context *vctx = virgl_context(ctx);
   int i;
   for (i = 0; i < num_targets; i++) {
      if (targets[i]) {
         struct virgl_winsys *vws = virgl_screen(vctx->base.screen)->vws;
         struct virgl_resource *res = virgl_resource(targets[i]->buffer);

         pipe_resource_reference(&vctx->so_targets[i].base.buffer, targets[i]->buffer);

         vws->emit_res(vws, vctx->cbuf, res->hw_res, FALSE);
      } else {
         pipe_resource_reference(&vctx->so_targets[i].base.buffer, NULL);
      }
   }
   for (i = num_targets; i < vctx->num_so_targets; i++)
      pipe_resource_reference(&vctx->so_targets[i].base.buffer, NULL);
   vctx->num_so_targets = num_targets;
   virgl_encoder_set_so_targets(vctx, num_targets, targets, 0);//append_bitmask);
}

void virgl_init_so_functions(struct virgl_context *vctx)
{
   vctx->base.create_stream_output_target = virgl_create_so_target;
   vctx->base.stream_output_target_destroy = virgl_destroy_so_target;
   vctx->base.set_stream_output_targets = virgl_set_so_targets;
}