renderer_vulkan: Add setting to log pipeline statistics

Use VK_KHR_pipeline_executable_properties when enabled and available to
log statistics about the pipeline cache in a game.

For example, this is on Turing GPUs when generating a pipeline cache
from Super Smash Bros. Ultimate:

Average pipeline statistics
==========================================
Code size:       6433.167
Register count:    32.939

More advanced results could be presented, at the moment it's just an
average of all 3D and compute pipelines.

1 files changed, 100 insertions, 0 deletions

diff --git a/src/video_core/renderer_vulkan/pipeline_statistics.cpp b/src/video_core/renderer_vulkan/pipeline_statistics.cpp
new file mode 100644
index 000000000..bfec931a6
--- /dev/null
+++ b/src/video_core/renderer_vulkan/pipeline_statistics.cpp
@@ -0,0 +1,100 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <string_view>
+
+#include <fmt/format.h>
+
+#include "common/common_types.h"
+#include "common/logging/log.h"
+#include "video_core/renderer_vulkan/pipeline_statistics.h"
+#include "video_core/vulkan_common/vulkan_device.h"
+#include "video_core/vulkan_common/vulkan_wrapper.h"
+
+namespace Vulkan {
+
+using namespace std::string_view_literals;
+
+static u64 GetUint64(const VkPipelineExecutableStatisticKHR& statistic) {
+    switch (statistic.format) {
+    case VK_PIPELINE_EXECUTABLE_STATISTIC_FORMAT_INT64_KHR:
+        return static_cast<u64>(statistic.value.i64);
+    case VK_PIPELINE_EXECUTABLE_STATISTIC_FORMAT_UINT64_KHR:
+        return statistic.value.u64;
+    case VK_PIPELINE_EXECUTABLE_STATISTIC_FORMAT_FLOAT64_KHR:
+        return static_cast<u64>(statistic.value.f64);
+    default:
+        return 0;
+    }
+}
+
+PipelineStatistics::PipelineStatistics(const Device& device_) : device{device_} {}
+
+void PipelineStatistics::Collect(VkPipeline pipeline) {
+    const auto& dev{device.GetLogical()};
+    const std::vector properties{dev.GetPipelineExecutablePropertiesKHR(pipeline)};
+    const u32 num_executables{static_cast<u32>(properties.size())};
+    for (u32 executable = 0; executable < num_executables; ++executable) {
+        const auto statistics{dev.GetPipelineExecutableStatisticsKHR(pipeline, executable)};
+        if (statistics.empty()) {
+            continue;
+        }
+        Stats stage_stats;
+        for (const auto& statistic : statistics) {
+            const char* const name{statistic.name};
+            if (name == "Binary Size"sv || name == "Code size"sv || name == "Instruction Count"sv) {
+                stage_stats.code_size = GetUint64(statistic);
+            } else if (name == "Register Count"sv) {
+                stage_stats.register_count = GetUint64(statistic);
+            } else if (name == "SGPRs"sv || name == "numUsedSgprs"sv) {
+                stage_stats.sgpr_count = GetUint64(statistic);
+            } else if (name == "VGPRs"sv || name == "numUsedVgprs"sv) {
+                stage_stats.vgpr_count = GetUint64(statistic);
+            } else if (name == "Branches"sv) {
+                stage_stats.branches_count = GetUint64(statistic);
+            } else if (name == "Basic Block Count"sv) {
+                stage_stats.basic_block_count = GetUint64(statistic);
+            }
+        }
+        std::lock_guard lock{mutex};
+        collected_stats.push_back(stage_stats);
+    }
+}
+
+void PipelineStatistics::Report() const {
+    double num{};
+    Stats total;
+    {
+        std::lock_guard lock{mutex};
+        for (const Stats& stats : collected_stats) {
+            total.code_size += stats.code_size;
+            total.register_count += stats.register_count;
+            total.sgpr_count += stats.sgpr_count;
+            total.vgpr_count += stats.vgpr_count;
+            total.branches_count += stats.branches_count;
+            total.basic_block_count += stats.basic_block_count;
+        }
+        num = static_cast<double>(collected_stats.size());
+    }
+    std::string report;
+    const auto add = [&](const char* fmt, u64 value) {
+        if (value > 0) {
+            report += fmt::format(fmt::runtime(fmt), static_cast<double>(value) / num);
+        }
+    };
+    add("Code size:      {:9.03f}\n", total.code_size);
+    add("Register count: {:9.03f}\n", total.register_count);
+    add("SGPRs:          {:9.03f}\n", total.sgpr_count);
+    add("VGPRs:          {:9.03f}\n", total.vgpr_count);
+    add("Branches count: {:9.03f}\n", total.branches_count);
+    add("Basic blocks:   {:9.03f}\n", total.basic_block_count);
+
+    LOG_INFO(Render_Vulkan,
+             "\nAverage pipeline statistics\n"
+             "==========================================\n"
+             "{}\n",
+             report);
+}
+
+} // namespace Vulkan