Play bootSound.btsnd while shaders/pipelines are compiling (#1047)

src/util/CMakeLists.txt

@@ -1,5 +1,7 @@
 add_library(CemuUtil
   boost/bluetooth.h
+  bootSound/BootSoundReader.cpp
+  bootSound/BootSoundReader.h
   ChunkedHeap/ChunkedHeap.h
   containers/flat_hash_map.hpp
   containers/IntervalBucketContainer.h

src/util/bootSound/BootSoundReader.cpp

@@ -0,0 +1,51 @@
+#include "BootSoundReader.h"
+#include "Cafe/CafeSystem.h"
+
+BootSoundReader::BootSoundReader(FSCVirtualFile* bootsndFile, sint32 blockSize) : bootsndFile(bootsndFile), blockSize(blockSize)
+{
+	// crash if this constructor is invoked with a blockSize that has a different number of samples per channel
+	cemu_assert(blockSize % (sizeof(sint16be) * 2) == 0);
+
+	fsc_setFileSeek(bootsndFile, 0);
+	fsc_readFile(bootsndFile, &muteBits, 4);
+	fsc_readFile(bootsndFile, &loopPoint, 4);
+
+	buffer.resize(blockSize / sizeof(sint16));
+	bufferBE.resize(blockSize / sizeof(sint16be));
+
+	// workaround: SM3DW has incorrect loop point
+	const auto titleId = CafeSystem::GetForegroundTitleId();
+	if(titleId == 0x0005000010145D00 || titleId == 0x0005000010145C00 || titleId == 0x0005000010106100)
+		loopPoint = 113074;
+}
+
+sint16* BootSoundReader::getSamples()
+{
+	size_t totalRead = 0;
+	const size_t loopPointOffset = 8 + loopPoint * 4;
+	while (totalRead < blockSize)
+	{
+		auto read = fsc_readFile(bootsndFile, bufferBE.data(), blockSize - totalRead);
+		if (read == 0)
+		{
+			cemuLog_log(LogType::Force, "failed to read PCM samples from bootSound.btsnd");
+			return nullptr;
+		}
+		if (read % (sizeof(sint16be) * 2) != 0)
+		{
+			cemuLog_log(LogType::Force, "failed to play bootSound.btsnd: reading PCM data stopped at an odd number of samples (is the file corrupt?)");
+			return nullptr;
+		}
+
+		std::copy_n(bufferBE.begin(), read / sizeof(sint16be), buffer.begin() + (totalRead / sizeof(sint16)));
+		totalRead += read;
+		if (totalRead < blockSize)
+			fsc_setFileSeek(bootsndFile, loopPointOffset);
+	}
+
+	// handle case where the end of a block of samples lines up with the end of the file
+	if(fsc_getFileSeek(bootsndFile) == fsc_getFileSize(bootsndFile))
+		fsc_setFileSeek(bootsndFile, loopPointOffset);
+
+	return buffer.data();
+}

src/util/bootSound/BootSoundReader.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "Cafe/Filesystem/fsc.h"
+
+class BootSoundReader
+{
+  public:
+	BootSoundReader() = delete;
+	BootSoundReader(FSCVirtualFile* bootsndFile, sint32 blockSize);
+
+	sint16* getSamples();
+
+  private:
+	FSCVirtualFile* bootsndFile{};
+	sint32 blockSize{};
+
+	uint32be muteBits{};
+	uint32be loopPoint{};
+	std::vector<sint16> buffer{};
+	std::vector<sint16be> bufferBE{};
+};