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[Vulkan] Smarter transient cache

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Detect cases where requested vertex data has already been uploaded in a larger buffer
This commit is contained in:
DrChat
2018-02-10 21:08:17 -06:00
parent e3787c05c1
commit d015de4a84
2 changed files with 28 additions and 7 deletions
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33
src/xenia/gpu/vulkan/buffer_cache.cc
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@@ -415,10 +415,22 @@ VkDeviceSize BufferCache::TryAllocateTransientData(VkDeviceSize length,
VkDeviceSize BufferCache::FindCachedTransientData(uint32_t guest_address,
uint32_t guest_length) {
uint64_t key = uint64_t(guest_length) << 32 | uint64_t(guest_address);
auto it = transient_cache_.find(key);
if (it != transient_cache_.end()) {
return it->second;
if (transient_cache_.empty()) {
// Short-circuit exit.
return VK_WHOLE_SIZE;
}
// Find the first element > guest_address
auto it = transient_cache_.upper_bound(guest_address);
if (it != transient_cache_.begin()) {
// it = first element < guest_address
--it;
if (it->first <= guest_address &&
(it->first + it->second.first) >= (guest_address + guest_length)) {
// This element is contained within some existing transient data.
return it->second.second + (guest_address - it->first);
}
}
return VK_WHOLE_SIZE;
@@ -427,8 +439,17 @@ VkDeviceSize BufferCache::FindCachedTransientData(uint32_t guest_address,
void BufferCache::CacheTransientData(uint32_t guest_address,
uint32_t guest_length,
VkDeviceSize offset) {
uint64_t key = uint64_t(guest_length) << 32 | uint64_t(guest_address);
transient_cache_[key] = offset;
transient_cache_[guest_address] = {guest_length, offset};
// Erase any entries contained within
auto it = transient_cache_.upper_bound(guest_address);
while (it != transient_cache_.end()) {
if ((guest_address + guest_length) >= (it->first + it->second.first)) {
it = transient_cache_.erase(it);
} else {
break;
}
}
}
void BufferCache::Flush(VkCommandBuffer command_buffer) {