swapchain: Fix MAILBOX and SHARED presentation modes
This change undoes two previous changes and fixes the original
performance problem reported with b/182887411. By default, Vulkan
swapchains should use:
- 3 images for FIFO (unless limited or increased from below)
- 1 images for SHARED
This reverts the following commits:
- commit 148bad076ef46297e516b650007852937a506c8b.
"swapchain: increase the minimal buffer count to 3"
- commit ef14146f7de705c2facfc8c470ea100503dbdb57.
"swapchain: always return a signle image for shared presentation mode"
Test: Manual testing with additional logging
Bug: 204105805
Bug: 182887411
Bug: 197790618
Change-Id: I9902d11aadf946a51c3f74e1462faf620a84a977
diff --git a/vulkan/libvulkan/swapchain.cpp b/vulkan/libvulkan/swapchain.cpp
index 54b10b1..b5a0bdf 100644
--- a/vulkan/libvulkan/swapchain.cpp
+++ b/vulkan/libvulkan/swapchain.cpp
@@ -537,30 +537,6 @@
}
}
-int get_min_buffer_count(ANativeWindow* window,
- uint32_t* out_min_buffer_count) {
- constexpr int kExtraBuffers = 2;
-
- int err;
- int min_undequeued_buffers;
- err = window->query(window, NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
- &min_undequeued_buffers);
- if (err != android::OK || min_undequeued_buffers < 0) {
- ALOGE(
- "NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS query failed: %s (%d) "
- "value=%d",
- strerror(-err), err, min_undequeued_buffers);
- if (err == android::OK) {
- err = android::UNKNOWN_ERROR;
- }
- return err;
- }
-
- *out_min_buffer_count =
- static_cast<uint32_t>(min_undequeued_buffers + kExtraBuffers);
- return android::OK;
-}
-
} // anonymous namespace
VKAPI_ATTR
@@ -675,7 +651,7 @@
strerror(-err), err);
return VK_ERROR_SURFACE_LOST_KHR;
}
- capabilities->minImageCount = max_buffer_count == 1 ? 1 : 2;
+ capabilities->minImageCount = std::min(max_buffer_count, 3);
capabilities->maxImageCount = static_cast<uint32_t>(max_buffer_count);
capabilities->currentExtent =
@@ -877,13 +853,18 @@
int err;
int query_value;
- uint32_t min_buffer_count;
ANativeWindow* window = SurfaceFromHandle(surface)->window.get();
- err = get_min_buffer_count(window, &min_buffer_count);
- if (err != android::OK) {
+ err = window->query(window, NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
+ &query_value);
+ if (err != android::OK || query_value < 0) {
+ ALOGE(
+ "NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS query failed: %s (%d) "
+ "value=%d",
+ strerror(-err), err, query_value);
return VK_ERROR_SURFACE_LOST_KHR;
}
+ uint32_t min_undequeued_buffers = static_cast<uint32_t>(query_value);
err = window->query(window, NATIVE_WINDOW_MAX_BUFFER_COUNT, &query_value);
if (err != android::OK || query_value < 0) {
@@ -894,7 +875,7 @@
uint32_t max_buffer_count = static_cast<uint32_t>(query_value);
std::vector<VkPresentModeKHR> present_modes;
- if (min_buffer_count < max_buffer_count)
+ if (min_undequeued_buffers + 1 < max_buffer_count)
present_modes.push_back(VK_PRESENT_MODE_MAILBOX_KHR);
present_modes.push_back(VK_PRESENT_MODE_FIFO_KHR);
@@ -1215,14 +1196,19 @@
}
}
- uint32_t min_buffer_count;
- err = get_min_buffer_count(window, &min_buffer_count);
- if (err != android::OK) {
+ int query_value;
+ err = window->query(window, NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
+ &query_value);
+ if (err != android::OK || query_value < 0) {
+ ALOGE("window->query failed: %s (%d) value=%d", strerror(-err), err,
+ query_value);
return VK_ERROR_SURFACE_LOST_KHR;
}
-
- uint32_t num_images =
- std::max(min_buffer_count, create_info->minImageCount);
+ uint32_t min_undequeued_buffers = static_cast<uint32_t>(query_value);
+ const auto mailbox_num_images = std::max(3u, create_info->minImageCount);
+ const auto requested_images =
+ swap_interval ? create_info->minImageCount : mailbox_num_images;
+ uint32_t num_images = requested_images - 1 + min_undequeued_buffers;
// Lower layer insists that we have at least two buffers. This is wasteful
// and we'd like to relax it in the shared case, but not all the pieces are
@@ -1236,12 +1222,6 @@
return VK_ERROR_SURFACE_LOST_KHR;
}
- // In shared mode the num_images must be one regardless of how many
- // buffers were allocated for the buffer queue.
- if (swapchain_image_usage & VK_SWAPCHAIN_IMAGE_USAGE_SHARED_BIT_ANDROID) {
- num_images = 1;
- }
-
int32_t legacy_usage = 0;
if (dispatch.GetSwapchainGrallocUsage2ANDROID) {
uint64_t consumer_usage, producer_usage;