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      1 /*
      2  * Copyright 2010 Marek Olk <maraeo (at) gmail.com>
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * on the rights to use, copy, modify, merge, publish, distribute, sub
      8  * license, and/or sell copies of the Software, and to permit persons to whom
      9  * the Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
     19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     21  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
     22 
     23 #include "pipe/p_context.h"
     24 #include "util/u_index_modify.h"
     25 #include "util/u_inlines.h"
     26 
     27 /* Ubyte indices. */
     28 
     29 void util_shorten_ubyte_elts_to_userptr(struct pipe_context *context,
     30 					const struct pipe_draw_info *info,
     31                                         unsigned add_transfer_flags,
     32 					int index_bias,
     33 					unsigned start,
     34 					unsigned count,
     35 					void *out)
     36 {
     37     struct pipe_transfer *src_transfer = NULL;
     38     const unsigned char *in_map;
     39     unsigned short *out_map = out;
     40     unsigned i;
     41 
     42     if (info->has_user_indices) {
     43        in_map = info->index.user;
     44     } else {
     45        in_map = pipe_buffer_map(context, info->index.resource,
     46                                 PIPE_TRANSFER_READ |
     47                                 add_transfer_flags,
     48                                 &src_transfer);
     49     }
     50     in_map += start;
     51 
     52     for (i = 0; i < count; i++) {
     53         *out_map = (unsigned short)(*in_map + index_bias);
     54         in_map++;
     55         out_map++;
     56     }
     57 
     58     if (src_transfer)
     59        pipe_buffer_unmap(context, src_transfer);
     60 }
     61 
     62 /* Ushort indices. */
     63 
     64 void util_rebuild_ushort_elts_to_userptr(struct pipe_context *context,
     65 					 const struct pipe_draw_info *info,
     66                                          unsigned add_transfer_flags,
     67 					 int index_bias,
     68 					 unsigned start, unsigned count,
     69 					 void *out)
     70 {
     71     struct pipe_transfer *in_transfer = NULL;
     72     const unsigned short *in_map;
     73     unsigned short *out_map = out;
     74     unsigned i;
     75 
     76     if (info->has_user_indices) {
     77        in_map = info->index.user;
     78     } else {
     79        in_map = pipe_buffer_map(context, info->index.resource,
     80                                 PIPE_TRANSFER_READ |
     81                                 add_transfer_flags,
     82                                 &in_transfer);
     83     }
     84     in_map += start;
     85 
     86     for (i = 0; i < count; i++) {
     87         *out_map = (unsigned short)(*in_map + index_bias);
     88         in_map++;
     89         out_map++;
     90     }
     91 
     92     if (in_transfer)
     93        pipe_buffer_unmap(context, in_transfer);
     94 }
     95 
     96 /* Uint indices. */
     97 
     98 void util_rebuild_uint_elts_to_userptr(struct pipe_context *context,
     99 				       const struct pipe_draw_info *info,
    100                                        unsigned add_transfer_flags,
    101 				       int index_bias,
    102 				       unsigned start, unsigned count,
    103 				       void *out)
    104 {
    105     struct pipe_transfer *in_transfer = NULL;
    106     const unsigned int *in_map;
    107     unsigned int *out_map = out;
    108     unsigned i;
    109 
    110     if (info->has_user_indices) {
    111        in_map = info->index.user;
    112     } else {
    113        in_map = pipe_buffer_map(context, info->index.resource,
    114                                 PIPE_TRANSFER_READ |
    115                                 add_transfer_flags,
    116                                 &in_transfer);
    117     }
    118     in_map += start;
    119 
    120     for (i = 0; i < count; i++) {
    121         *out_map = (unsigned int)(*in_map + index_bias);
    122         in_map++;
    123         out_map++;
    124     }
    125 
    126     if (in_transfer)
    127        pipe_buffer_unmap(context, in_transfer);
    128 }
    129