Function alloc_mem

libavutil/hwcontext_vulkan.c:2315–2371

}

static int alloc_mem(AVHWDeviceContext *ctx, VkMemoryRequirements *req,
                     VkMemoryPropertyFlagBits req_flags, const void *alloc_extension,
                     VkMemoryPropertyFlagBits *mem_flags, VkDeviceMemory *mem)
{
    VkResult ret;
    int index = -1;
    VulkanDevicePriv *p = ctx->hwctx;
    FFVulkanFunctions *vk = &p->vkctx.vkfn;
    AVVulkanDeviceContext *dev_hwctx = &p->p;
    VkMemoryAllocateInfo alloc_info = {
        .sType          = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
        .pNext          = alloc_extension,
        .allocationSize = req->size,
    };

    /* The vulkan spec requires memory types to be sorted in the "optimal"
     * order, so the first matching type we find will be the best/fastest one */
    for (int i = 0; i < p->mprops.memoryTypeCount; i++) {
        const VkMemoryType *type = &p->mprops.memoryTypes[i];

        /* The memory type must be supported by the requirements (bitfield) */
        if (!(req->memoryTypeBits & (1 << i)))
            continue;

        /* The memory type flags must include our properties */
        if ((type->propertyFlags & req_flags) != req_flags)
            continue;

        /* The memory type must be large enough */
        if (req->size > p->mprops.memoryHeaps[type->heapIndex].size)
            continue;

        /* Found a suitable memory type */
        index = i;
        break;
    }

    if (index < 0) {
        av_log(ctx, AV_LOG_ERROR, "No memory type found for flags 0x%x\n",
               req_flags);
        return AVERROR(EINVAL);
    }

    alloc_info.memoryTypeIndex = index;

    ret = vk->AllocateMemory(dev_hwctx->act_dev, &alloc_info,
                             dev_hwctx->alloc, mem);
    if (ret != VK_SUCCESS) {
        av_log(ctx, AV_LOG_ERROR, "Failed to allocate memory: %s\n",
               ff_vk_ret2str(ret));
        return AVERROR(ENOMEM);
    }

    *mem_flags |= p->mprops.memoryTypes[index].propertyFlags;

    return 0;
}