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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2012 Marek Olšák <maraeo@gmail.com>
  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 THE AUTHORS AND/OR THEIR 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 "util/u_helpers.h"
  29. #include "util/u_inlines.h"
  30.  
  31. /**
  32.  * This function is used to copy an array of pipe_vertex_buffer structures,
  33.  * while properly referencing the pipe_vertex_buffer::buffer member.
  34.  *
  35.  * enabled_buffers is updated such that the bits corresponding to the indices
  36.  * of disabled buffers are set to 0 and the enabled ones are set to 1.
  37.  *
  38.  * \sa util_copy_framebuffer_state
  39.  */
  40. void util_set_vertex_buffers_mask(struct pipe_vertex_buffer *dst,
  41.                                   uint32_t *enabled_buffers,
  42.                                   const struct pipe_vertex_buffer *src,
  43.                                   unsigned start_slot, unsigned count)
  44. {
  45.    unsigned i;
  46.    uint32_t bitmask = 0;
  47.  
  48.    dst += start_slot;
  49.  
  50.    if (src) {
  51.       for (i = 0; i < count; i++) {
  52.          if (src[i].buffer || src[i].user_buffer) {
  53.             bitmask |= 1 << i;
  54.          }
  55.          pipe_resource_reference(&dst[i].buffer, src[i].buffer);
  56.       }
  57.  
  58.       /* Copy over the other members of pipe_vertex_buffer. */
  59.       memcpy(dst, src, count * sizeof(struct pipe_vertex_buffer));
  60.  
  61.       *enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
  62.       *enabled_buffers |= bitmask << start_slot;
  63.    }
  64.    else {
  65.       /* Unreference the buffers. */
  66.       for (i = 0; i < count; i++) {
  67.          pipe_resource_reference(&dst[i].buffer, NULL);
  68.          dst[i].user_buffer = NULL;
  69.       }
  70.  
  71.       *enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
  72.    }
  73. }
  74.  
  75. /**
  76.  * Same as util_set_vertex_buffers_mask, but it only returns the number
  77.  * of bound buffers.
  78.  */
  79. void util_set_vertex_buffers_count(struct pipe_vertex_buffer *dst,
  80.                                    unsigned *dst_count,
  81.                                    const struct pipe_vertex_buffer *src,
  82.                                    unsigned start_slot, unsigned count)
  83. {
  84.    uint32_t enabled_buffers = (1ull << *dst_count) - 1;
  85.  
  86.    util_set_vertex_buffers_mask(dst, &enabled_buffers, src, start_slot,
  87.                                 count);
  88.  
  89.    *dst_count = util_last_bit(enabled_buffers);
  90. }
  91.