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mk_empty_cache.cpp
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mk_empty_cache.cpp
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#include "vulkan/vulkan.h"
#include <cassert>
#include <cstdint>
#include <cstdio>
#include <fcntl.h>
#include <iostream>
#include <string>
#include <sys/io.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
void printHelp() {
std::cerr << "mk-empty-cache -- Vulkan application to create an empty Vulkan Pipeline Cache file\n\n"
<< "USAGE:\t mk-empty-cache output-cache-file.bin\n";
}
int main(int argc, char **argv) {
if (argc != 2) {
printHelp();
return 3;
}
std::string firstArg(argv[1]);
if (firstArg.empty() || firstArg.front() == '-' || firstArg.front() == '?' || firstArg.find("help") == 0) {
printHelp();
return 3;
}
int cacheFD = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, mode_t(0666));
if (cacheFD == -1) {
perror("Error opening output cache file for write");
return 3;
}
#define CHECKED(VK_CALL...) \
do { \
auto vkCallRes = (VK_CALL); \
if (vkCallRes != VK_SUCCESS) { \
std::cerr << #VK_CALL << " failed, value = " << static_cast<int64_t>(vkCallRes) << " (" << __FILE__ << ":" \
<< __LINE__ << ")\n"; \
return 4; \
} \
} while (false)
VkApplicationInfo appInfo = {};
appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
appInfo.pApplicationName = "mk-empty-cache";
appInfo.applicationVersion = VK_MAKE_VERSION(0, 0, 1);
appInfo.pEngineName = "No Engine (headless)";
appInfo.engineVersion = VK_MAKE_VERSION(0, 0, 1);
appInfo.apiVersion = VK_API_VERSION_1_0;
VkInstanceCreateInfo createInfo = {};
createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
createInfo.pApplicationInfo = &appInfo;
VkInstance instance = nullptr;
CHECKED(vkCreateInstance(&createInfo, nullptr, &instance));
uint32_t gpuCount = 0;
CHECKED(vkEnumeratePhysicalDevices(instance, &gpuCount, nullptr));
std::vector<VkPhysicalDevice> physicalDevices(gpuCount);
CHECKED(vkEnumeratePhysicalDevices(instance, &gpuCount, physicalDevices.data()));
VkPhysicalDevice physicalDevice = physicalDevices[0];
VkDeviceCreateInfo deviceCreateInfo = {};
deviceCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
deviceCreateInfo.queueCreateInfoCount = 0;
VkDevice device = nullptr;
CHECKED(vkCreateDevice(physicalDevice, &deviceCreateInfo, nullptr, &device));
VkPipelineCacheCreateInfo pipelineCacheCreateInfo = {};
pipelineCacheCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_CACHE_CREATE_INFO;
pipelineCacheCreateInfo.initialDataSize = 0;
pipelineCacheCreateInfo.pInitialData = nullptr;
VkPipelineCache pipelineCache = nullptr;
CHECKED(vkCreatePipelineCache(device, &pipelineCacheCreateInfo, nullptr, &pipelineCache));
size_t pipelineCacheSize = 0;
CHECKED(vkGetPipelineCacheData(device, pipelineCache, &pipelineCacheSize, nullptr));
if (pipelineCacheSize == 0) {
std::cerr << "Queried pipeline cache data is, unexpectedly, empty\n";
return 4;
}
if (ftruncate(cacheFD, pipelineCacheSize) != 0) {
perror("Faield to resize the output cache file");
return 4;
}
void *outBuffer = mmap(nullptr, pipelineCacheSize, PROT_READ | PROT_WRITE, MAP_SHARED, cacheFD, 0);
if (outBuffer == MAP_FAILED) {
perror("Failed to mmap the output file");
return 4;
}
CHECKED(vkGetPipelineCacheData(device, pipelineCache, &pipelineCacheSize, outBuffer));
std::cout << "Pipeline cache data successfully written to " << firstArg << std::endl;
munmap(outBuffer, pipelineCacheSize);
close(cacheFD);
vkDestroyPipelineCache(device, pipelineCache, nullptr);
vkDestroyDevice(device, nullptr);
vkDestroyInstance(instance, nullptr);
return 0;
#undef CHECKED
}