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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2010 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28. #include "lp_context.h"
  29. #include "lp_state.h"
  30. #include "lp_texture.h"
  31.  
  32. #include "util/u_memory.h"
  33. #include "draw/draw_context.h"
  34.  
  35. static struct pipe_stream_output_target *
  36. llvmpipe_create_so_target(struct pipe_context *pipe,
  37.                           struct pipe_resource *buffer,
  38.                           unsigned buffer_offset,
  39.                           unsigned buffer_size)
  40. {
  41.    struct draw_so_target *t;
  42.  
  43.    t = CALLOC_STRUCT(draw_so_target);
  44.    if (!t)
  45.       return NULL;
  46.  
  47.    t->target.context = pipe;
  48.    t->target.reference.count = 1;
  49.    pipe_resource_reference(&t->target.buffer, buffer);
  50.    t->target.buffer_offset = buffer_offset;
  51.    t->target.buffer_size = buffer_size;
  52.    return &t->target;
  53. }
  54.  
  55. static void
  56. llvmpipe_so_target_destroy(struct pipe_context *pipe,
  57.                            struct pipe_stream_output_target *target)
  58. {
  59.    pipe_resource_reference(&target->buffer, NULL);
  60.    FREE(target);
  61. }
  62.  
  63. static void
  64. llvmpipe_set_so_targets(struct pipe_context *pipe,
  65.                         unsigned num_targets,
  66.                         struct pipe_stream_output_target **targets,
  67.                         unsigned append_bitmask)
  68. {
  69.    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
  70.    int i;
  71.    for (i = 0; i < num_targets; i++) {
  72.       pipe_so_target_reference((struct pipe_stream_output_target **)&llvmpipe->so_targets[i], targets[i]);
  73.       /* if we're not appending then lets reset the internal
  74.          data of our so target */
  75.       if (!(append_bitmask & (1 << i)) && llvmpipe->so_targets[i]) {
  76.          llvmpipe->so_targets[i]->internal_offset = 0;
  77.          llvmpipe->so_targets[i]->emitted_vertices = 0;
  78.       }
  79.    }
  80.  
  81.    for (; i < llvmpipe->num_so_targets; i++) {
  82.       pipe_so_target_reference((struct pipe_stream_output_target **)&llvmpipe->so_targets[i], NULL);
  83.    }
  84.    llvmpipe->num_so_targets = num_targets;
  85. }
  86.  
  87. void
  88. llvmpipe_init_so_funcs(struct llvmpipe_context *pipe)
  89. {
  90.    pipe->pipe.create_stream_output_target = llvmpipe_create_so_target;
  91.    pipe->pipe.stream_output_target_destroy = llvmpipe_so_target_destroy;
  92.    pipe->pipe.set_stream_output_targets = llvmpipe_set_so_targets;
  93. }
  94.