src/panfrost/encoder/pan_texture.c

   1 /*
   2  * Copyright (C) 2008 VMware, Inc.
   3  * Copyright (C) 2014 Broadcom
   4  * Copyright (C) 2018-2019 Alyssa Rosenzweig
   5  * Copyright (C) 2019-2020 Collabora, Ltd.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  *
  26  */
  27
  28 #include "util/macros.h"
  29 #include "pan_texture.h"
  30
  31 /* Computes sizes for checksumming, which is 8 bytes per 16x16 tile.
  32  * Checksumming is believed to be a CRC variant (CRC64 based on the size?).
  33  * This feature is also known as "transaction elimination". */
  34
  35 #define CHECKSUM_TILE_WIDTH 16
  36 #define CHECKSUM_TILE_HEIGHT 16
  37 #define CHECKSUM_BYTES_PER_TILE 8
  38
  39 unsigned
  40 panfrost_compute_checksum_size(
  41         struct panfrost_slice *slice,
  42         unsigned width,
  43         unsigned height)
  44 {
  45         unsigned aligned_width = ALIGN_POT(width, CHECKSUM_TILE_WIDTH);
  46         unsigned aligned_height = ALIGN_POT(height, CHECKSUM_TILE_HEIGHT);
  47
  48         unsigned tile_count_x = aligned_width / CHECKSUM_TILE_WIDTH;
  49         unsigned tile_count_y = aligned_height / CHECKSUM_TILE_HEIGHT;
  50
  51         slice->checksum_stride = tile_count_x * CHECKSUM_BYTES_PER_TILE;
  52
  53         return slice->checksum_stride * tile_count_y;
  54 }