/*
 * Copyright © 2016 Red Hat.
 * Copyright © 2016 Bas Nieuwenhuizen
 * Copyright © 2017 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vk_util.h"
#include "util/debug.h"

#include "compiler/spirv/nir_spirv.h"

uint32_t vk_get_driver_version(void)
{
   const char *minor_string = strchr(PACKAGE_VERSION, '.');
   const char *patch_string = minor_string ? strchr(minor_string + 1, '.') : NULL;
   int major = atoi(PACKAGE_VERSION);
   int minor = minor_string ? atoi(minor_string + 1) : 0;
   int patch = patch_string ? atoi(patch_string + 1) : 0;
   if (strstr(PACKAGE_VERSION, "devel")) {
      if (patch == 0) {
         patch = 99;
         if (minor == 0) {
            minor = 99;
            --major;
         } else
            --minor;
      } else
         --patch;
   }
   return VK_MAKE_VERSION(major, minor, patch);
}

uint32_t vk_get_version_override(void)
{
   const char *str = getenv("MESA_VK_VERSION_OVERRIDE");
   if (str == NULL)
      return 0;

   const char *minor_str = strchr(str, '.');
   const char *patch_str = minor_str ? strchr(minor_str + 1, '.') : NULL;

   int major = atoi(str);
   int minor = minor_str ? atoi(minor_str + 1) : 0;
   int patch = patch_str ? atoi(patch_str + 1) : 0;

   /* Do some basic version sanity checking */
   if (major < 1 || minor < 0 || patch < 0 || minor > 1023 || patch > 4095)
      return 0;

   return VK_MAKE_VERSION(major, minor, patch);
}

void
vk_warn_non_conformant_implementation(const char *driver_name)
{
   if (env_var_as_boolean("MESA_VK_IGNORE_CONFORMANCE_WARNING", false))
      return;

   fprintf(stderr, "WARNING: %s is not a conformant Vulkan implementation, "
                   "testing use only.\n", driver_name);
}

struct nir_spirv_specialization*
vk_spec_info_to_nir_spirv(const VkSpecializationInfo *spec_info,
                          uint32_t *out_num_spec_entries)
{
   if (spec_info == NULL || spec_info->mapEntryCount == 0)
      return NULL;

   uint32_t num_spec_entries = spec_info->mapEntryCount;
   struct nir_spirv_specialization *spec_entries =
      calloc(num_spec_entries, sizeof(*spec_entries));

   for (uint32_t i = 0; i < num_spec_entries; i++) {
      VkSpecializationMapEntry entry = spec_info->pMapEntries[i];
      const void *data = (uint8_t *)spec_info->pData + entry.offset;
      assert((uint8_t *)data + entry.size <=
             (uint8_t *)spec_info->pData + spec_info->dataSize);

      spec_entries[i].id = spec_info->pMapEntries[i].constantID;
      switch (entry.size) {
      case 8:
         spec_entries[i].value.u64 = *(const uint64_t *)data;
         break;
      case 4:
         spec_entries[i].value.u32 = *(const uint32_t *)data;
         break;
      case 2:
         spec_entries[i].value.u16 = *(const uint16_t *)data;
         break;
      case 1:
         spec_entries[i].value.u8 = *(const uint8_t *)data;
         break;
      case 0:
      default:
         /* The Vulkan spec says:
          *
          *    "For a constantID specialization constant declared in a
          *    shader, size must match the byte size of the constantID. If
          *    the specialization constant is of type boolean, size must be
          *    the byte size of VkBool32."
          *
          * Therefore, since only scalars can be decorated as
          * specialization constants, we can assume that if it doesn't have
          * a size of 1, 2, 4, or 8, any use in a shader would be invalid
          * usage.  The spec further says:
          *
          *    "If a constantID value is not a specialization constant ID
          *    used in the shader, that map entry does not affect the
          *    behavior of the pipeline."
          *
          * so we should ignore any invalid specialization constants rather
          * than crash or error out when we see one.
          */
         break;
      }
   }

   *out_num_spec_entries = num_spec_entries;
   return spec_entries;
}