src/vulkan/isl.c

   1 /*
   2  * Copyright 2015 Intel Corporation
   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  *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  *  and/or sell copies of the Software, and to permit persons to whom the
   9  *  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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  *  IN THE SOFTWARE.
  22  */
  23
  24 #include <assert.h>
  25
  26 #include "mesa/main/imports.h"
  27
  28 #include "isl.h"
  29
  30 /**
  31  * Log base 2, rounding towards zero.
  32  */
  33 static inline uint32_t
  34 isl_log2u(uint32_t n)
  35 {
  36    assert(n != 0);
  37    return 31 - __builtin_clz(n);
  38 }
  39
  40 void
  41 isl_device_init(struct isl_device *dev,
  42                 const struct brw_device_info *info)
  43 {
  44    dev->info = info;
  45 }
  46
  47 /**
  48  * The returned extent's units are (width=bytes, height=rows).
  49  */
  50 void
  51 isl_tiling_get_extent(const struct isl_device *dev,
  52                       enum isl_tiling tiling,
  53                       uint32_t cpp,
  54                       struct isl_extent2d *e)
  55 {
  56    static const struct isl_extent2d legacy_extents[] = {
  57       [ISL_TILING_LINEAR]  = {   1,   1 },
  58       [ISL_TILING_X]       = { 512,   8 },
  59       [ISL_TILING_Y]       = { 128,  32 },
  60       [ISL_TILING_W]       = { 128,  32 },
  61    };
  62
  63    static const struct isl_extent2d yf_extents[] = {
  64       /*cpp*/
  65       /* 1*/ [0] = {   64, 64 },
  66       /* 2*/ [1] = {  128, 32 },
  67       /* 4*/ [2] = {  128, 32 },
  68       /* 8*/ [3] = {  256, 16 },
  69       /*16*/ [4] = {  256, 16 },
  70    };
  71
  72    assert(cpp > 0);
  73
  74    switch (tiling) {
  75    case ISL_TILING_LINEAR:
  76    case ISL_TILING_X:
  77    case ISL_TILING_Y:
  78    case ISL_TILING_W:
  79       *e = legacy_extents[tiling];
  80       return;
  81    case ISL_TILING_Yf:
  82    case ISL_TILING_Ys:
  83       assert(_mesa_is_pow_two(cpp));
  84       *e = yf_extents[isl_log2u(cpp)];
  85       if (tiling == ISL_TILING_Ys) {
  86          e->width *= 4;
  87          e->height *= 4;
  88       }
  89       return;
  90    }
  91 }