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render/vulkan: Handle multi-descriptor sets

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A combined image sampler may need several descriptors in a descriptor
set. We are not currently checking how many descriptors are required,
nor is it presumably guaranteed that such multi-descriptor allocation
will not fail due to fragmentation.

If the pool free counter is not zero, try to allocate but continue with
the next pool and fall back to creating a new pool if the allocation
failed.

Fixes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/4010
This commit is contained in:
Kenny Levinsen 2025-09-08 15:40:55 +02:00 • committed by Simon Ser
parent d7ae9a866b
commit dd7f543189
1 changed files with 61 additions and 48 deletions
Download patch file Download diff file Expand all files Collapse all files

109
render/vulkan/renderer.c
View file

@ -66,59 +66,72 @@ static struct wlr_vk_descriptor_pool *alloc_ds(
struct wl_list *pool_list, size_t *last_pool_size) {
VkResult res;
bool found = false;
struct wlr_vk_descriptor_pool *pool;
wl_list_for_each(pool, pool_list, link) {
if (pool->free > 0) {
found = true;
break;
}
}
if (!found) { // create new pool
pool = calloc(1, sizeof(*pool));
if (!pool) {
wlr_log_errno(WLR_ERROR, "allocation failed");
return NULL;
}
size_t count = 2 * (*last_pool_size);
if (!count) {
count = start_descriptor_pool_size;
}
pool->free = count;
VkDescriptorPoolSize pool_size = {
.descriptorCount = count,
.type = type,
};
VkDescriptorPoolCreateInfo dpool_info = {
.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO,
.maxSets = count,
.poolSizeCount = 1,
.pPoolSizes = &pool_size,
.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT,
};
res = vkCreateDescriptorPool(renderer->dev->dev, &dpool_info, NULL,
&pool->pool);
if (res != VK_SUCCESS) {
wlr_vk_error("vkCreateDescriptorPool", res);
free(pool);
return NULL;
}
*last_pool_size = count;
wl_list_insert(pool_list, &pool->link);
}
VkDescriptorSetAllocateInfo ds_info = {
.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
.descriptorSetCount = 1,
.pSetLayouts = layout,
.descriptorPool = pool->pool,
};
struct wlr_vk_descriptor_pool *pool;
wl_list_for_each(pool, pool_list, link) {
if (pool->free > 0) {
ds_info.descriptorPool = pool->pool;
res = vkAllocateDescriptorSets(renderer->dev->dev, &ds_info, ds);
switch (res) {
case VK_ERROR_FRAGMENTED_POOL:
case VK_ERROR_OUT_OF_POOL_MEMORY:
// Descriptor sets with more than one descriptor can cause us
// to run out of pool memory early or lead to fragmentation
// that makes the pool unable to service our allocation
// request. Try the next pool or allocate a new one.
continue;
case VK_SUCCESS:
--pool->free;
return pool;
default:
wlr_vk_error("vkAllocateDescriptorSets", res);
return NULL;
}
}
}
pool = calloc(1, sizeof(*pool));
if (!pool) {
wlr_log_errno(WLR_ERROR, "allocation failed");
return NULL;
}
size_t count = 2 * (*last_pool_size);
if (!count) {
count = start_descriptor_pool_size;
}
pool->free = count;
VkDescriptorPoolSize pool_size = {
.descriptorCount = count,
.type = type,
};
VkDescriptorPoolCreateInfo dpool_info = {
.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO,
.maxSets = count,
.poolSizeCount = 1,
.pPoolSizes = &pool_size,
.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT,
};
res = vkCreateDescriptorPool(renderer->dev->dev, &dpool_info, NULL,
&pool->pool);
if (res != VK_SUCCESS) {
wlr_vk_error("vkCreateDescriptorPool", res);
free(pool);
return NULL;
}
*last_pool_size = count;
wl_list_insert(pool_list, &pool->link);
ds_info.descriptorPool = pool->pool;
res = vkAllocateDescriptorSets(renderer->dev->dev, &ds_info, ds);
if (res != VK_SUCCESS) {
wlr_vk_error("vkAllocateDescriptorSets", res);