mirror of
https://github.com/lbgos/rift-s-linux.git
synced 2026-10-24 04:07:35 +02:00
435 lines
19 KiB
C++
435 lines
19 KiB
C++
// Copyright 2026, lbgos
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// SPDX-License-Identifier: BSL-1.0
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#include "overlay_preview.hpp"
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#include <algorithm>
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#include <cmath>
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#include <cstring>
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#include <memory>
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#include <sstream>
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#include <stdexcept>
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#include <string>
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#include <vector>
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#include <vulkan/vulkan.h>
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namespace {
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void check(VkResult result) {
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if (result != VK_SUCCESS)
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throw std::runtime_error("Headset preview Vulkan error " +
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std::to_string(result));
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}
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std::vector<std::string> split(const std::string &value) {
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std::istringstream stream(value);
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std::vector<std::string> out;
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for (std::string part; stream >> part;)
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out.push_back(part);
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return out;
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}
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std::vector<const char *> pointers(const std::vector<std::string> &values) {
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std::vector<const char *> out;
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for (const auto &value : values)
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out.push_back(value.c_str());
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return out;
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}
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struct Preview {
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VkInstance instance{};
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VkPhysicalDevice physical{};
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VkDevice device{};
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VkQueue queue{};
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uint32_t family{};
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VkCommandPool pool{};
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VkCommandBuffer command{};
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VkFence fence{};
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VkDeviceMemory buffer_memory{};
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VkDescriptorSetLayout descriptor_layout{};
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VkDescriptorPool descriptor_pool{};
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VkDescriptorSet descriptor{};
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VkPipelineLayout pipeline_layout{};
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VkPipeline pipeline{};
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VkSampler sampler{};
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VkImageView source_view{};
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VkBuffer buffer{};
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uint32_t width{}, height{};
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vr::IVROverlayView *api{};
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vr::VROverlayView_t view{};
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bool acquired{};
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std::vector<uint8_t> pixels;
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uint32_t memory_type(uint32_t bits, VkMemoryPropertyFlags flags) {
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VkPhysicalDeviceMemoryProperties properties{};
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vkGetPhysicalDeviceMemoryProperties(physical, &properties);
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for (uint32_t i = 0; i < properties.memoryTypeCount; ++i)
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if ((bits & (1u << i)) &&
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(properties.memoryTypes[i].propertyFlags & flags) == flags)
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return i;
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throw std::runtime_error("Headset preview memory unavailable");
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}
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void initialize(vr::IVRSystem *system, vr::IVRCompositor *compositor) {
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uint32_t length =
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compositor->GetVulkanInstanceExtensionsRequired(nullptr, 0);
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if (!length || length > 65536)
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throw std::runtime_error("Headset preview extensions unavailable");
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std::string required(length, '\0');
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compositor->GetVulkanInstanceExtensionsRequired(required.data(), length);
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auto names = split(required);
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auto extensions = pointers(names);
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VkApplicationInfo app{VK_STRUCTURE_TYPE_APPLICATION_INFO};
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app.pApplicationName = "Rift S Settings";
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app.apiVersion = VK_API_VERSION_1_1;
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VkInstanceCreateInfo create{VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO};
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create.pApplicationInfo = &app;
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create.enabledExtensionCount = extensions.size();
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create.ppEnabledExtensionNames = extensions.data();
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check(vkCreateInstance(&create, nullptr, &instance));
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uint64_t output = 0;
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system->GetOutputDevice(&output, vr::TextureType_Vulkan, instance);
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physical = reinterpret_cast<VkPhysicalDevice>(output);
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if (!physical)
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throw std::runtime_error("Headset preview GPU unavailable");
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uint32_t count = 0;
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vkGetPhysicalDeviceQueueFamilyProperties(physical, &count, nullptr);
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std::vector<VkQueueFamilyProperties> families(count);
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vkGetPhysicalDeviceQueueFamilyProperties(physical, &count, families.data());
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while (family < count && (families[family].queueFlags &
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(VK_QUEUE_GRAPHICS_BIT | VK_QUEUE_COMPUTE_BIT)) !=
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(VK_QUEUE_GRAPHICS_BIT | VK_QUEUE_COMPUTE_BIT))
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++family;
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if (family == count)
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throw std::runtime_error("Headset preview queue unavailable");
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length =
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compositor->GetVulkanDeviceExtensionsRequired(physical, nullptr, 0);
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if (!length || length > 65536)
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throw std::runtime_error("Headset preview device extensions unavailable");
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required.assign(length, '\0');
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compositor->GetVulkanDeviceExtensionsRequired(physical, required.data(),
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length);
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names = split(required);
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extensions = pointers(names);
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float priority = 1;
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VkDeviceQueueCreateInfo queue_create{
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VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO};
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queue_create.queueFamilyIndex = family;
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queue_create.queueCount = 1;
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queue_create.pQueuePriorities = &priority;
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VkPhysicalDeviceTimelineSemaphoreFeatures timeline{
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VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TIMELINE_SEMAPHORE_FEATURES};
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VkPhysicalDeviceFeatures2 features{
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VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2};
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features.pNext = &timeline;
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vkGetPhysicalDeviceFeatures2(physical, &features);
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VkDeviceCreateInfo device_create{VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO};
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device_create.queueCreateInfoCount = 1;
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device_create.pQueueCreateInfos = &queue_create;
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device_create.enabledExtensionCount = extensions.size();
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device_create.ppEnabledExtensionNames = extensions.data();
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device_create.pNext = &timeline;
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check(vkCreateDevice(physical, &device_create, nullptr, &device));
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vkGetDeviceQueue(device, family, 0, &queue);
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VkCommandPoolCreateInfo pool_create{
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VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO};
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pool_create.queueFamilyIndex = family;
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pool_create.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
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check(vkCreateCommandPool(device, &pool_create, nullptr, &pool));
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VkCommandBufferAllocateInfo allocate{
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VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO};
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allocate.commandPool = pool;
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allocate.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
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allocate.commandBufferCount = 1;
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check(vkAllocateCommandBuffers(device, &allocate, &command));
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VkFenceCreateInfo fence_create{VK_STRUCTURE_TYPE_FENCE_CREATE_INFO};
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check(vkCreateFence(device, &fence_create, nullptr, &fence));
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}
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void initialize_sampling() {
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VkDescriptorSetLayoutBinding bindings[] = {
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{0, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1,
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VK_SHADER_STAGE_COMPUTE_BIT, nullptr},
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{1, VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1, VK_SHADER_STAGE_COMPUTE_BIT,
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nullptr}};
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VkDescriptorSetLayoutCreateInfo layout{
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VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO};
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layout.bindingCount = 2;
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layout.pBindings = bindings;
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check(vkCreateDescriptorSetLayout(device, &layout, nullptr,
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&descriptor_layout));
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VkDescriptorPoolSize sizes[] = {
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{VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1},
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{VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1}};
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VkDescriptorPoolCreateInfo descriptors{
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VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO};
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descriptors.maxSets = 1;
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descriptors.poolSizeCount = 2;
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descriptors.pPoolSizes = sizes;
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check(vkCreateDescriptorPool(device, &descriptors, nullptr,
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&descriptor_pool));
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VkDescriptorSetAllocateInfo allocate{
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VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO};
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allocate.descriptorPool = descriptor_pool;
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allocate.descriptorSetCount = 1;
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allocate.pSetLayouts = &descriptor_layout;
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check(vkAllocateDescriptorSets(device, &allocate, &descriptor));
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VkPushConstantRange push{VK_SHADER_STAGE_COMPUTE_BIT, 0, 28};
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VkPipelineLayoutCreateInfo pipeline_create{
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VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO};
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pipeline_create.setLayoutCount = 1;
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pipeline_create.pSetLayouts = &descriptor_layout;
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pipeline_create.pushConstantRangeCount = 1;
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pipeline_create.pPushConstantRanges = &push;
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check(vkCreatePipelineLayout(device, &pipeline_create, nullptr,
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&pipeline_layout));
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// Generated from overlay_preview.comp with glslc -fshader-stage=compute
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// -mfmt=c.
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static constexpr uint32_t code[] =
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#include "overlay_preview_shader.inc"
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;
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VkShaderModuleCreateInfo module_create{
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VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO};
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module_create.codeSize = sizeof(code);
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module_create.pCode = code;
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VkShaderModule module{};
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check(vkCreateShaderModule(device, &module_create, nullptr, &module));
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VkComputePipelineCreateInfo compute{
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VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO};
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compute.layout = pipeline_layout;
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compute.stage = {VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
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nullptr,
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0,
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VK_SHADER_STAGE_COMPUTE_BIT,
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module,
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"main",
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nullptr};
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auto created = vkCreateComputePipelines(device, VK_NULL_HANDLE, 1, &compute,
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nullptr, &pipeline);
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vkDestroyShaderModule(device, module, nullptr);
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check(created);
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VkSamplerCreateInfo sample{VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO};
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sample.magFilter = sample.minFilter = VK_FILTER_NEAREST;
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sample.addressModeU = sample.addressModeV = sample.addressModeW =
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VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
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check(vkCreateSampler(device, &sample, nullptr, &sampler));
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}
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bool release() {
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auto result = acquired && api ? api->ReleaseOverlayView(&view)
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: vr::VROverlayError_None;
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acquired = false;
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view = {};
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return result == vr::VROverlayError_None;
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}
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void clear_buffers() {
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if (buffer)
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vkDestroyBuffer(device, buffer, nullptr);
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if (buffer_memory)
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vkFreeMemory(device, buffer_memory, nullptr);
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buffer = {};
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buffer_memory = {};
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}
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void resize(uint32_t w, uint32_t h) {
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if (w == width && h == height && buffer)
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return;
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clear_buffers();
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width = w;
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height = h;
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VkBufferCreateInfo create{VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO};
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create.size = size_t(w) * h * 4;
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create.usage = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;
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check(vkCreateBuffer(device, &create, nullptr, &buffer));
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VkMemoryRequirements requirements{};
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vkGetBufferMemoryRequirements(device, buffer, &requirements);
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VkMemoryAllocateInfo allocation{VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO};
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allocation.allocationSize = requirements.size;
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allocation.memoryTypeIndex = memory_type(
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requirements.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
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VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
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check(vkAllocateMemory(device, &allocation, nullptr, &buffer_memory));
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check(vkBindBufferMemory(device, buffer, buffer_memory, 0));
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pixels.resize(size_t(w) * h * 4);
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}
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void copy(const vr::VRVulkanTextureData_t &source,
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const vr::VRTextureBounds_t &bounds) {
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if (source.m_pDevice != device || source.m_nQueueFamilyIndex != family ||
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source.m_nSampleCount != 1 || source.m_nWidth == 0 ||
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source.m_nHeight == 0 || source.m_nWidth > 16384 ||
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source.m_nHeight > 16384)
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throw std::runtime_error("Headset preview texture unsupported");
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const float coords[] = {bounds.uMin, bounds.uMax, bounds.vMin, bounds.vMax};
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for (float value : coords)
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if (!std::isfinite(value) || value < 0 || value > 1)
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throw std::runtime_error("Headset preview bounds invalid");
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uint32_t w =
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std::lround(std::abs(bounds.uMax - bounds.uMin) * source.m_nWidth);
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uint32_t h =
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std::lround(std::abs(bounds.vMax - bounds.vMin) * source.m_nHeight);
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if (!w || !h)
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throw std::runtime_error("Headset preview bounds empty");
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double scale = std::min(1.0, 512.0 / std::max(w, h));
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resize(std::max(1u, uint32_t(w * scale)),
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std::max(1u, uint32_t(h * scale)));
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auto format = VkFormat(source.m_nFormat);
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VkFormatProperties properties{};
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vkGetPhysicalDeviceFormatProperties(physical, format, &properties);
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if (!(properties.optimalTilingFeatures &
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VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT))
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throw std::runtime_error("Headset preview format unsupported");
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VkImageViewCreateInfo view_create{VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO};
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view_create.image = reinterpret_cast<VkImage>(source.m_nImage);
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view_create.viewType = VK_IMAGE_VIEW_TYPE_2D;
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view_create.format = format;
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view_create.subresourceRange = {VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1};
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check(vkCreateImageView(device, &view_create, nullptr, &source_view));
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VkDescriptorImageInfo sampled{sampler, source_view,
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VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL};
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VkDescriptorBufferInfo output{buffer, 0, pixels.size()};
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VkWriteDescriptorSet writes[2]{};
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for (auto &write : writes) {
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write.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
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write.dstSet = descriptor;
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write.descriptorCount = 1;
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}
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writes[0].descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
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writes[0].pImageInfo = &sampled;
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writes[1].dstBinding = 1;
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writes[1].descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER;
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writes[1].pBufferInfo = &output;
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vkUpdateDescriptorSets(device, 2, writes, 0, nullptr);
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check(vkResetCommandBuffer(command, 0));
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VkCommandBufferBeginInfo begin{VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO};
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begin.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
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check(vkBeginCommandBuffer(command, &begin));
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// The acquired image is sampleable and stable. Never write or transition
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// it, and finish all GPU reads before ReleaseOverlayView frees the import.
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VkMemoryBarrier readable{VK_STRUCTURE_TYPE_MEMORY_BARRIER};
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readable.srcAccessMask = VK_ACCESS_MEMORY_WRITE_BIT;
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readable.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
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vkCmdPipelineBarrier(command, VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
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VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, 0, 1, &readable,
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0, nullptr, 0, nullptr);
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vkCmdBindPipeline(command, VK_PIPELINE_BIND_POINT_COMPUTE, pipeline);
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vkCmdBindDescriptorSets(command, VK_PIPELINE_BIND_POINT_COMPUTE,
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pipeline_layout, 0, 1, &descriptor, 0, nullptr);
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struct {
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float bounds[4];
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uint32_t width, height, srgb;
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} push{{bounds.uMin, bounds.vMin, bounds.uMax, bounds.vMax},
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width,
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height,
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uint32_t(format == VK_FORMAT_R8G8B8A8_SRGB ||
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format == VK_FORMAT_B8G8R8A8_SRGB ||
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format == VK_FORMAT_A8B8G8R8_SRGB_PACK32)};
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vkCmdPushConstants(command, pipeline_layout, VK_SHADER_STAGE_COMPUTE_BIT, 0,
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sizeof(push), &push);
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vkCmdDispatch(command, (width + 7) / 8, (height + 7) / 8, 1);
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VkBufferMemoryBarrier host{VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER};
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host.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT;
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host.dstAccessMask = VK_ACCESS_HOST_READ_BIT;
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host.srcQueueFamilyIndex = host.dstQueueFamilyIndex =
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VK_QUEUE_FAMILY_IGNORED;
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host.buffer = buffer;
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host.size = VK_WHOLE_SIZE;
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vkCmdPipelineBarrier(command, VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
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VK_PIPELINE_STAGE_HOST_BIT, 0, 0, nullptr, 1, &host, 0,
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nullptr);
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check(vkEndCommandBuffer(command));
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check(vkResetFences(device, 1, &fence));
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VkSubmitInfo submit{VK_STRUCTURE_TYPE_SUBMIT_INFO};
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submit.commandBufferCount = 1;
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submit.pCommandBuffers = &command;
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check(vkQueueSubmit(queue, 1, &submit, fence));
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check(vkWaitForFences(device, 1, &fence, VK_TRUE, 500000000));
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vkDestroyImageView(device, source_view, nullptr);
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source_view = {};
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void *mapped{};
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check(vkMapMemory(device, buffer_memory, 0, pixels.size(), 0, &mapped));
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std::memcpy(pixels.data(), mapped, pixels.size());
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vkUnmapMemory(device, buffer_memory);
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}
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~Preview() {
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if (device)
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vkDeviceWaitIdle(device);
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if (source_view)
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vkDestroyImageView(device, source_view, nullptr);
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release();
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clear_buffers();
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if (pipeline)
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vkDestroyPipeline(device, pipeline, nullptr);
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if (pipeline_layout)
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vkDestroyPipelineLayout(device, pipeline_layout, nullptr);
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if (sampler)
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vkDestroySampler(device, sampler, nullptr);
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if (descriptor_pool)
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vkDestroyDescriptorPool(device, descriptor_pool, nullptr);
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if (descriptor_layout)
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vkDestroyDescriptorSetLayout(device, descriptor_layout, nullptr);
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if (fence)
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vkDestroyFence(device, fence, nullptr);
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if (pool)
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vkDestroyCommandPool(device, pool, nullptr);
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if (device)
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vkDestroyDevice(device, nullptr);
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if (instance)
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vkDestroyInstance(instance, nullptr);
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}
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};
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std::unique_ptr<Preview> preview;
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std::string error;
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} // namespace
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const char *rifts_overlay_frame(vr::IVRSystem *system,
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vr::IVRCompositor *compositor,
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vr::IVROverlay *overlay,
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vr::IVROverlayView *api, const uint8_t **data,
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size_t *bytes, uint32_t *w, uint32_t *h) {
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*data = nullptr;
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*bytes = 0;
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*w = *h = 0;
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if (!system || !compositor || !overlay || !api)
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return "Headset preview unavailable";
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vr::VROverlayHandle_t handle{};
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if (overlay->FindOverlay(vr::k_pchHeadsetViewOverlayKey, &handle) !=
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vr::VROverlayError_None)
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return "Open VR View to preview";
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if (!api->IsViewingPermitted(handle))
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return "Headset preview access unavailable";
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try {
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if (!preview) {
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preview = std::make_unique<Preview>();
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preview->initialize(system, compositor);
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preview->initialize_sampling();
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}
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preview->api = api;
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vr::VRVulkanDevice_t vulkan{preview->instance, preview->device,
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preview->physical, preview->queue,
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preview->family};
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vr::VRNativeDevice_t native{&vulkan, vr::DeviceType_Vulkan};
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auto acquired = api->AcquireOverlayView(handle, &native, &preview->view,
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sizeof(preview->view));
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// Even a view with no queued frame owns native resources and must be
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// released.
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preview->acquired = true;
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if (acquired != vr::VROverlayError_None)
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throw std::runtime_error("Headset preview acquisition error " +
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std::to_string(acquired));
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if (!preview->view.texture.handle) {
|
|
if (!preview->release())
|
|
throw std::runtime_error("Headset preview release failed");
|
|
auto activity = system->GetTrackedDeviceActivityLevel(0);
|
|
return activity == vr::k_EDeviceActivityLevel_Standby
|
|
? "Put on the headset to preview"
|
|
: "Headset view has no frame";
|
|
}
|
|
if (preview->view.texture.eType != vr::TextureType_Vulkan)
|
|
throw std::runtime_error("Headset preview texture type unsupported");
|
|
preview->copy(
|
|
*static_cast<vr::VRVulkanTextureData_t *>(preview->view.texture.handle),
|
|
preview->view.textureBounds);
|
|
if (!preview->release())
|
|
throw std::runtime_error("Headset preview release failed");
|
|
*data = preview->pixels.data();
|
|
*bytes = preview->pixels.size();
|
|
*w = preview->width;
|
|
*h = preview->height;
|
|
return nullptr;
|
|
} catch (const std::exception &failure) {
|
|
error = failure.what();
|
|
preview.reset();
|
|
return error.c_str();
|
|
}
|
|
}
|
|
void rifts_overlay_shutdown() { preview.reset(); }
|