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-rw-r--r--src/tests/CMakeLists.txt1
-rw-r--r--src/tests/common/scratch_buffer.cpp199
2 files changed, 200 insertions, 0 deletions
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index 348d1edf4..6a4022e45 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -8,6 +8,7 @@ add_executable(tests
common/host_memory.cpp
common/param_package.cpp
common/ring_buffer.cpp
+ common/scratch_buffer.cpp
common/unique_function.cpp
core/core_timing.cpp
core/internal_network/network.cpp
diff --git a/src/tests/common/scratch_buffer.cpp b/src/tests/common/scratch_buffer.cpp
new file mode 100644
index 000000000..b602c8d0a
--- /dev/null
+++ b/src/tests/common/scratch_buffer.cpp
@@ -0,0 +1,199 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <algorithm>
+#include <array>
+#include <span>
+#include <catch2/catch.hpp>
+#include "common/common_types.h"
+#include "common/scratch_buffer.h"
+
+namespace Common {
+
+TEST_CASE("ScratchBuffer: Basic Test", "[common]") {
+ ScratchBuffer<u8> buf;
+
+ REQUIRE(buf.size() == 0U);
+ REQUIRE(buf.capacity() == 0U);
+
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ buf.resize(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size());
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+}
+
+TEST_CASE("ScratchBuffer: resize_destructive Grow", "[common]") {
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ ScratchBuffer<u8> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ // Increasing the size should reallocate the buffer
+ buf.resize_destructive(payload.size() * 2);
+ REQUIRE(buf.size() == payload.size() * 2);
+ REQUIRE(buf.capacity() == payload.size() * 2);
+
+ // Since the buffer is not value initialized, reading its data will be garbage
+}
+
+TEST_CASE("ScratchBuffer: resize_destructive Shrink", "[common]") {
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ ScratchBuffer<u8> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size());
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+
+ // Decreasing the size should not cause a buffer reallocation
+ // This can be tested by ensuring the buffer capacity and data has not changed,
+ buf.resize_destructive(1U);
+ REQUIRE(buf.size() == 1U);
+ REQUIRE(buf.capacity() == payload.size());
+
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+}
+
+TEST_CASE("ScratchBuffer: resize Grow u8", "[common]") {
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ ScratchBuffer<u8> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size());
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+
+ // Increasing the size should reallocate the buffer
+ buf.resize(payload.size() * 2);
+ REQUIRE(buf.size() == payload.size() * 2);
+ REQUIRE(buf.capacity() == payload.size() * 2);
+
+ // resize() keeps the previous data intact
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+}
+
+TEST_CASE("ScratchBuffer: resize Grow u64", "[common]") {
+ std::array<u64, 10> payload;
+ payload.fill(6666);
+
+ ScratchBuffer<u64> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size() * sizeof(u64));
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+
+ // Increasing the size should reallocate the buffer
+ buf.resize(payload.size() * 2);
+ REQUIRE(buf.size() == payload.size() * 2);
+ REQUIRE(buf.capacity() == payload.size() * 2);
+
+ // resize() keeps the previous data intact
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+}
+
+TEST_CASE("ScratchBuffer: resize Shrink", "[common]") {
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ ScratchBuffer<u8> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size());
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+
+ // Decreasing the size should not cause a buffer reallocation
+ // This can be tested by ensuring the buffer capacity and data has not changed,
+ buf.resize(1U);
+ REQUIRE(buf.size() == 1U);
+ REQUIRE(buf.capacity() == payload.size());
+
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+}
+
+TEST_CASE("ScratchBuffer: Span Size", "[common]") {
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ ScratchBuffer<u8> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size());
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+
+ buf.resize(3U);
+ REQUIRE(buf.size() == 3U);
+ REQUIRE(buf.capacity() == payload.size());
+
+ const auto buf_span = std::span<u8>(buf);
+ // The span size is the last requested size of the buffer, not its capacity
+ REQUIRE(buf_span.size() == buf.size());
+
+ for (size_t i = 0; i < buf_span.size(); ++i) {
+ REQUIRE(buf_span[i] == buf[i]);
+ REQUIRE(buf_span[i] == payload[i]);
+ }
+}
+
+TEST_CASE("ScratchBuffer: Span Writes", "[common]") {
+ std::array<u8, 10> payload;
+ payload.fill(66);
+
+ ScratchBuffer<u8> buf(payload.size());
+ REQUIRE(buf.size() == payload.size());
+ REQUIRE(buf.capacity() == payload.size());
+
+ std::memcpy(buf.data(), payload.data(), payload.size());
+ for (size_t i = 0; i < payload.size(); ++i) {
+ REQUIRE(buf[i] == payload[i]);
+ }
+
+ buf.resize(3U);
+ REQUIRE(buf.size() == 3U);
+ REQUIRE(buf.capacity() == payload.size());
+
+ const auto buf_span = std::span<u8>(buf);
+ REQUIRE(buf_span.size() == buf.size());
+
+ for (size_t i = 0; i < buf_span.size(); ++i) {
+ const auto new_value = static_cast<u8>(i + 1U);
+ // Writes to a span of the scratch buffer will propogate to the buffer itself
+ buf_span[i] = new_value;
+ REQUIRE(buf[i] == new_value);
+ }
+}
+
+} // namespace Common
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