anv/android: support creating images from external format

Since we don't know the exact format at creation time, some initialization
is done only when bound with memory in vkBindImageMemory.

v2: demand dedicated allocation in vkGetImageMemoryRequirements2 if
    image has external format

v3: refactor prepare_ahw_image, support vkBindImageMemory2,
    calculate stride correctly for rgb(x) surfaces, rename as
    'resolve_ahw_image'

v4: rebase to b43f955037 changes
v5: add some assertions to verify input correctness (Lionel)

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_android.c

@@ -373,6 +373,42 @@ anv_create_ahw_memory(VkDevice device_h,
    return VK_SUCCESS;
 }
 
+VkResult
+anv_image_from_external(
+   VkDevice device_h,
+   const VkImageCreateInfo *base_info,
+   const struct VkExternalMemoryImageCreateInfo *create_info,
+   const VkAllocationCallbacks *alloc,
+   VkImage *out_image_h)
+{
+   ANV_FROM_HANDLE(anv_device, device, device_h);
+
+   const struct VkExternalFormatANDROID *ext_info =
+      vk_find_struct_const(base_info->pNext, EXTERNAL_FORMAT_ANDROID);
+
+   if (ext_info && ext_info->externalFormat != 0) {
+      assert(base_info->format == VK_FORMAT_UNDEFINED);
+      assert(base_info->imageType == VK_IMAGE_TYPE_2D);
+      assert(base_info->usage == VK_IMAGE_USAGE_SAMPLED_BIT);
+      assert(base_info->tiling == VK_IMAGE_TILING_OPTIMAL);
+   }
+
+   struct anv_image_create_info anv_info = {
+      .vk_info = base_info,
+      .isl_extra_usage_flags = ISL_SURF_USAGE_DISABLE_AUX_BIT,
+      .external_format = true,
+   };
+
+   VkImage image_h;
+   VkResult result = anv_image_create(device_h, &anv_info, alloc, &image_h);
+   if (result != VK_SUCCESS)
+      return result;
+
+   *out_image_h = image_h;
+
+   return VK_SUCCESS;
+}
+
 VkResult
 anv_image_from_gralloc(VkDevice device_h,
                        const VkImageCreateInfo *base_info,