util/u_helpers.c

   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 #include "util/u_upload_mgr.h"
  31
  32 /**
  33  * This function is used to copy an array of pipe_vertex_buffer structures,
  34  * while properly referencing the pipe_vertex_buffer::buffer member.
  35  *
  36  * enabled_buffers is updated such that the bits corresponding to the indices
  37  * of disabled buffers are set to 0 and the enabled ones are set to 1.
  38  *
  39  * \sa util_copy_framebuffer_state
  40  */
  41 void util_set_vertex_buffers_mask(struct pipe_vertex_buffer *dst,
  42                                   uint32_t *enabled_buffers,
  43                                   const struct pipe_vertex_buffer *src,
  44                                   unsigned start_slot, unsigned count)
  45 {
  46    unsigned i;
  47    uint32_t bitmask = 0;
  48
  49    dst += start_slot;
  50
  51    if (src) {
  52       for (i = 0; i < count; i++) {
  53          if (src[i].buffer || src[i].user_buffer) {
  54             bitmask |= 1 << i;
  55          }
  56          pipe_resource_reference(&dst[i].buffer, src[i].buffer);
  57       }
  58
  59       /* Copy over the other members of pipe_vertex_buffer. */
  60       memcpy(dst, src, count * sizeof(struct pipe_vertex_buffer));
  61
  62       *enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
  63       *enabled_buffers |= bitmask << start_slot;
  64    }
  65    else {
  66       /* Unreference the buffers. */
  67       for (i = 0; i < count; i++) {
  68          pipe_resource_reference(&dst[i].buffer, NULL);
  69          dst[i].user_buffer = NULL;
  70       }
  71
  72       *enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
  73    }
  74 }
  75
  76 /**
  77  * Same as util_set_vertex_buffers_mask, but it only returns the number
  78  * of bound buffers.
  79  */
  80 void util_set_vertex_buffers_count(struct pipe_vertex_buffer *dst,
  81                                    unsigned *dst_count,
  82                                    const struct pipe_vertex_buffer *src,
  83                                    unsigned start_slot, unsigned count)
  84 {
  85    unsigned i;
  86    uint32_t enabled_buffers = 0;
  87
  88    for (i = 0; i < *dst_count; i++) {
  89       if (dst[i].buffer || dst[i].user_buffer)
  90          enabled_buffers |= (1ull << i);
  91    }
  92
  93    util_set_vertex_buffers_mask(dst, &enabled_buffers, src, start_slot,
  94                                 count);
  95
  96    *dst_count = util_last_bit(enabled_buffers);
  97 }
  98
  99
 100 void
 101 util_set_index_buffer(struct pipe_index_buffer *dst,
 102                       const struct pipe_index_buffer *src)
 103 {
 104    if (src) {
 105       pipe_resource_reference(&dst->buffer, src->buffer);
 106       memcpy(dst, src, sizeof(*dst));
 107    }
 108    else {
 109       pipe_resource_reference(&dst->buffer, NULL);
 110       memset(dst, 0, sizeof(*dst));
 111    }
 112 }
 113
 114 /**
 115  * Given a user index buffer, save the structure to "saved", and upload it.
 116  */
 117 bool
 118 util_save_and_upload_index_buffer(struct pipe_context *pipe,
 119                                   const struct pipe_draw_info *info,
 120                                   const struct pipe_index_buffer *ib,
 121                                   struct pipe_index_buffer *out_saved)
 122 {
 123    struct pipe_index_buffer new_ib = {0};
 124    unsigned start_offset = info->start * ib->index_size;
 125
 126    u_upload_data(pipe->stream_uploader, start_offset,
 127                  info->count * ib->index_size, 4,
 128                  (char*)ib->user_buffer + start_offset,
 129                  &new_ib.offset, &new_ib.buffer);
 130    if (!new_ib.buffer)
 131       return false;
 132    u_upload_unmap(pipe->stream_uploader);
 133
 134    new_ib.offset -= start_offset;
 135    new_ib.index_size = ib->index_size;
 136
 137    util_set_index_buffer(out_saved, ib);
 138    pipe->set_index_buffer(pipe, &new_ib);
 139    pipe_resource_reference(&new_ib.buffer, NULL);
 140    return true;
 141 }