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https://github.com/libretro/RetroArch
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9f7d0c74d5
* [Vulkan] Add v2 of context negotiation interface. * [Vulkan] Add vkEnumerateInstanceVersion symbol. * [Vulkan] Implement v2 context negotiation * [libretro] Add GET_HW_CONTEXT_NEGOTIATION_INTERFACE_SUPPORT. Works around issues in v1 interface where it was not possible to query what frontend would do when faces with newer interface versions. This env-call gives stronger guarantees how things have to work. * [runloop] Implement GET_HW_CONTEXT_NEGOATION_INTERFACE_SUPPORT. Fairly trivial. Just report the latest version. * [Vulkan] Add stricted wording around get_application_info in v2. * [Vulkan] Be more defensive about get_application_info() in v1.
495 lines
24 KiB
C
495 lines
24 KiB
C
/* Copyright (C) 2010-2020 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------------
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* The following license statement only applies to this libretro API header (libretro_vulkan.h)
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* ---------------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef LIBRETRO_VULKAN_H__
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#define LIBRETRO_VULKAN_H__
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#include <libretro.h>
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#include <vulkan/vulkan.h>
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#define RETRO_HW_RENDER_INTERFACE_VULKAN_VERSION 5
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#define RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN_VERSION 2
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struct retro_vulkan_image
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{
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VkImageView image_view;
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VkImageLayout image_layout;
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VkImageViewCreateInfo create_info;
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};
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typedef void (*retro_vulkan_set_image_t)(void *handle,
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const struct retro_vulkan_image *image,
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uint32_t num_semaphores,
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const VkSemaphore *semaphores,
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uint32_t src_queue_family);
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typedef uint32_t (*retro_vulkan_get_sync_index_t)(void *handle);
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typedef uint32_t (*retro_vulkan_get_sync_index_mask_t)(void *handle);
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typedef void (*retro_vulkan_set_command_buffers_t)(void *handle,
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uint32_t num_cmd,
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const VkCommandBuffer *cmd);
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typedef void (*retro_vulkan_wait_sync_index_t)(void *handle);
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typedef void (*retro_vulkan_lock_queue_t)(void *handle);
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typedef void (*retro_vulkan_unlock_queue_t)(void *handle);
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typedef void (*retro_vulkan_set_signal_semaphore_t)(void *handle, VkSemaphore semaphore);
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typedef const VkApplicationInfo *(*retro_vulkan_get_application_info_t)(void);
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struct retro_vulkan_context
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{
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VkPhysicalDevice gpu;
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VkDevice device;
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VkQueue queue;
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uint32_t queue_family_index;
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VkQueue presentation_queue;
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uint32_t presentation_queue_family_index;
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};
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/* This is only used in v1 of the negotiation interface.
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* It is deprecated since it cannot express PDF2 features or optional extensions. */
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typedef bool (*retro_vulkan_create_device_t)(
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struct retro_vulkan_context *context,
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VkInstance instance,
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VkPhysicalDevice gpu,
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VkSurfaceKHR surface,
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PFN_vkGetInstanceProcAddr get_instance_proc_addr,
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const char **required_device_extensions,
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unsigned num_required_device_extensions,
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const char **required_device_layers,
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unsigned num_required_device_layers,
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const VkPhysicalDeviceFeatures *required_features);
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typedef void (*retro_vulkan_destroy_device_t)(void);
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/* v2 CONTEXT_NEGOTIATION_INTERFACE only. */
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typedef VkInstance (*retro_vulkan_create_instance_wrapper_t)(
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void *opaque, const VkInstanceCreateInfo *create_info);
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/* v2 CONTEXT_NEGOTIATION_INTERFACE only. */
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typedef VkInstance (*retro_vulkan_create_instance_t)(
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PFN_vkGetInstanceProcAddr get_instance_proc_addr,
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const VkApplicationInfo *app,
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retro_vulkan_create_instance_wrapper_t create_instance_wrapper,
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void *opaque);
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/* v2 CONTEXT_NEGOTIATION_INTERFACE only. */
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typedef VkDevice (*retro_vulkan_create_device_wrapper_t)(
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VkPhysicalDevice gpu, void *opaque,
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const VkDeviceCreateInfo *create_info);
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/* v2 CONTEXT_NEGOTIATION_INTERFACE only. */
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typedef bool (*retro_vulkan_create_device2_t)(
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struct retro_vulkan_context *context,
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VkInstance instance,
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VkPhysicalDevice gpu,
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VkSurfaceKHR surface,
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PFN_vkGetInstanceProcAddr get_instance_proc_addr,
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retro_vulkan_create_device_wrapper_t create_device_wrapper,
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void *opaque);
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/* Note on thread safety:
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* The Vulkan API is heavily designed around multi-threading, and
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* the libretro interface for it should also be threading friendly.
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* A core should be able to build command buffers and submit
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* command buffers to the GPU from any thread.
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*/
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struct retro_hw_render_context_negotiation_interface_vulkan
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{
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/* Must be set to RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN. */
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enum retro_hw_render_context_negotiation_interface_type interface_type;
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/* Usually set to RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN_VERSION,
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* but can be lower depending on GET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_SUPPORT. */
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unsigned interface_version;
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/* If non-NULL, returns a VkApplicationInfo struct that the frontend can use instead of
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* its "default" application info.
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* VkApplicationInfo::apiVersion also controls the target core Vulkan version for instance level functionality.
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* Lifetime of the returned pointer must remain until the retro_vulkan_context is initialized.
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*
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* NOTE: For optimal compatibility with e.g. Android which is very slow to update its loader,
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* a core version of 1.1 should be requested. Features beyond that can be requested with extensions.
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* Vulkan 1.0 is only appropriate for legacy cores, but is still supported.
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* A frontend is free to bump the instance creation apiVersion as necessary if the frontend requires more advanced core features.
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*
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* v2: This function must not be NULL, and must not return NULL.
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* v1: It was not clearly defined if this function could return NULL.
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* Frontends should be defensive and provide a default VkApplicationInfo
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* if this function returns NULL or if this function is NULL.
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*/
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retro_vulkan_get_application_info_t get_application_info;
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/* If non-NULL, the libretro core will choose one or more physical devices,
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* create one or more logical devices and create one or more queues.
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* The core must prepare a designated PhysicalDevice, Device, Queue and queue family index
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* which the frontend will use for its internal operation.
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*
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* If gpu is not VK_NULL_HANDLE, the physical device provided to the frontend must be this PhysicalDevice if the call succeeds.
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* The core is still free to use other physical devices for other purposes that are private to the core.
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*
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* The frontend will request certain extensions and layers for a device which is created.
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* The core must ensure that the queue and queue_family_index support GRAPHICS and COMPUTE.
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*
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* If surface is not VK_NULL_HANDLE, the core must consider presentation when creating the queues.
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* If presentation to "surface" is supported on the queue, presentation_queue must be equal to queue.
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* If not, a second queue must be provided in presentation_queue and presentation_queue_index.
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* If surface is not VK_NULL_HANDLE, the instance from frontend will have been created with supported for
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* VK_KHR_surface extension.
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*
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* The core is free to set its own queue priorities.
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* Device provided to frontend is owned by the frontend, but any additional device resources must be freed by core
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* in destroy_device callback.
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*
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* If this function returns true, a PhysicalDevice, Device and Queues are initialized.
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* If false, none of the above have been initialized and the frontend will attempt
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* to fallback to "default" device creation, as if this function was never called.
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*/
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retro_vulkan_create_device_t create_device;
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/* If non-NULL, this callback is called similar to context_destroy for HW_RENDER_INTERFACE.
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* However, it will be called even if context_reset was not called.
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* This can happen if the context never succeeds in being created.
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* destroy_device will always be called before the VkInstance
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* of the frontend is destroyed if create_device was called successfully so that the core has a chance of
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* tearing down its own device resources.
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*
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* Only auxillary resources should be freed here, i.e. resources which are not part of retro_vulkan_context.
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* v2: Auxillary instance resources created during create_instance can also be freed here.
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*/
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retro_vulkan_destroy_device_t destroy_device;
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/* v2 API: If interface_version is < 2, fields below must be ignored.
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* If the frontend does not support interface version 2, the v1 entry points will be used instead. */
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/* If non-NULL, this is called to create an instance, otherwise a VkInstance is created by the frontend.
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* v1 interface bug: The only way to enable instance features is through core versions signalled in VkApplicationInfo.
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* The frontend may request that certain extensions and layers
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* are enabled on the VkInstance. Application may add additional features.
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* If app is non-NULL, apiVersion controls the minimum core version required by the application.
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* Return a VkInstance or VK_NULL_HANDLE. The VkInstance is owned by the frontend.
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*
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* Rather than call vkCreateInstance directly, a core must call the CreateInstance wrapper provided with:
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* VkInstance instance = create_instance_wrapper(opaque, &create_info);
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* If the core wishes to create a private instance for whatever reason (relying on shared memory for example),
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* it may call vkCreateInstance directly. */
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retro_vulkan_create_instance_t create_instance;
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/* If non-NULL and frontend recognizes negotiation interface >= 2, create_device2 takes precedence over create_device.
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* Similar to create_device, but is extended to better understand new core versions and PDF2 feature enablement.
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* Requirements for create_device2 are the same as create_device unless a difference is mentioned.
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*
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* v2 consideration:
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* If the chosen gpu by frontend cannot be supported, a core must return false.
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*
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* NOTE: "Cannot be supported" is intentionally vaguely defined.
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* Refusing to run on an iGPU for a very intensive core with desktop GPU as a minimum spec may be in the gray area.
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* Not supporting optional features is not a good reason to reject a physical device, however.
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*
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* On device creation feature with explicit gpu, a frontend should fall back create_device2 with gpu == VK_NULL_HANDLE and let core
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* decide on a supported device if possible.
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*
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* A core must assume that the explicitly provided GPU is the only guaranteed attempt it has to create a device.
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* A fallback may not be attempted if there are particular reasons why only a specific physical device can work,
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* but these situations should be esoteric and rare in nature, e.g. a libretro frontend is implemented with external memory
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* and only LUID matching would work.
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* Cores and frontends should ensure "best effort" when negotiating like this and appropriate logging is encouraged.
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*
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* v1 note: In the v1 version of create_device, it was never expected that create_device would fail like this,
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* and frontends are not expected to attempt fall backs.
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*
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* Rather than call vkCreateDevice directly, a core must call the CreateDevice wrapper provided with:
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* VkDevice device = create_device_wrapper(gpu, opaque, &create_info);
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* If the core wishes to create a private device for whatever reason (relying on shared memory for example),
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* it may call vkCreateDevice directly.
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*
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* This allows the frontend to add additional extensions that it requires as well as adjust the PDF2 pNext as required.
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* It is also possible adjust the queue create infos in case the frontend desires to allocate some private queues.
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*
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* The get_instance_proc_addr provided in create_device2 must be the same as create_instance.
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*
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* NOTE: The frontend must not disable features requested by application.
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* NOTE: The frontend must not add any robustness features as some API behavior may change (VK_EXT_descriptor_buffer comes to mind).
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* I.e. robustBufferAccess and the like. (nullDescriptor from robustness2 is allowed to be enabled).
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*/
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retro_vulkan_create_device2_t create_device2;
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};
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struct retro_hw_render_interface_vulkan
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{
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/* Must be set to RETRO_HW_RENDER_INTERFACE_VULKAN. */
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enum retro_hw_render_interface_type interface_type;
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/* Must be set to RETRO_HW_RENDER_INTERFACE_VULKAN_VERSION. */
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unsigned interface_version;
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/* Opaque handle to the Vulkan backend in the frontend
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* which must be passed along to all function pointers
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* in this interface.
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*
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* The rationale for including a handle here (which libretro v1
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* doesn't currently do in general) is:
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*
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* - Vulkan cores should be able to be freely threaded without lots of fuzz.
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* This would break frontends which currently rely on TLS
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* to deal with multiple cores loaded at the same time.
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* - Fixing this in general is TODO for an eventual libretro v2.
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*/
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void *handle;
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/* The Vulkan instance the context is using. */
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VkInstance instance;
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/* The physical device used. */
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VkPhysicalDevice gpu;
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/* The logical device used. */
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VkDevice device;
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/* Allows a core to fetch all its needed symbols without having to link
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* against the loader itself. */
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PFN_vkGetDeviceProcAddr get_device_proc_addr;
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PFN_vkGetInstanceProcAddr get_instance_proc_addr;
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/* The queue the core must use to submit data.
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* This queue and index must remain constant throughout the lifetime
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* of the context.
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*
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* This queue will be the queue that supports graphics and compute
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* if the device supports compute.
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*/
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VkQueue queue;
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unsigned queue_index;
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/* Before calling retro_video_refresh_t with RETRO_HW_FRAME_BUFFER_VALID,
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* set which image to use for this frame.
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*
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* If num_semaphores is non-zero, the frontend will wait for the
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* semaphores provided to be signaled before using the results further
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* in the pipeline.
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*
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* Semaphores provided by a single call to set_image will only be
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* waited for once (waiting for a semaphore resets it).
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* E.g. set_image, video_refresh, and then another
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* video_refresh without set_image,
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* but same image will only wait for semaphores once.
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*
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* For this reason, ownership transfer will only occur if semaphores
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* are waited on for a particular frame in the frontend.
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*
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* Using semaphores is optional for synchronization purposes,
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* but if not using
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* semaphores, an image memory barrier in vkCmdPipelineBarrier
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* should be used in the graphics_queue.
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* Example:
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*
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* vkCmdPipelineBarrier(cmd,
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* srcStageMask = VK_PIPELINE_STAGE_ALL_GRAPHICS_BIT,
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* dstStageMask = VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
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* image_memory_barrier = {
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* srcAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,
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* dstAccessMask = VK_ACCESS_SHADER_READ_BIT,
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* });
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*
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* The use of pipeline barriers instead of semaphores is encouraged
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* as it is simpler and more fine-grained. A layout transition
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* must generally happen anyways which requires a
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* pipeline barrier.
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*
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* The image passed to set_image must have imageUsage flags set to at least
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* VK_IMAGE_USAGE_TRANSFER_SRC_BIT and VK_IMAGE_USAGE_SAMPLED_BIT.
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* The core will naturally want to use flags such as
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* VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT and/or
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* VK_IMAGE_USAGE_TRANSFER_DST_BIT depending
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* on how the final image is created.
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*
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* The image must also have been created with MUTABLE_FORMAT bit set if
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* 8-bit formats are used, so that the frontend can reinterpret sRGB
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* formats as it sees fit.
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*
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* Images passed to set_image should be created with TILING_OPTIMAL.
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* The image layout should be transitioned to either
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* VK_IMAGE_LAYOUT_GENERIC or VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL.
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* The actual image layout used must be set in image_layout.
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*
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* The image must be a 2D texture which may or not be layered
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* and/or mipmapped.
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*
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* The image must be suitable for linear sampling.
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* While the image_view is typically the only field used,
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* the frontend may want to reinterpret the texture as sRGB vs.
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* non-sRGB for example so the VkImageViewCreateInfo used to
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* create the image view must also be passed in.
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*
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* The data in the pointer to the image struct will not be copied
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* as the pNext field in create_info cannot be reliably deep-copied.
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* The image pointer passed to set_image must be valid until
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* retro_video_refresh_t has returned.
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*
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* If frame duping is used when passing NULL to retro_video_refresh_t,
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* the frontend is free to either use the latest image passed to
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* set_image or reuse the older pointer passed to set_image the
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* frame RETRO_HW_FRAME_BUFFER_VALID was last used.
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*
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* Essentially, the lifetime of the pointer passed to
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* retro_video_refresh_t should be extended if frame duping is used
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* so that the frontend can reuse the older pointer.
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*
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* The image itself however, must not be touched by the core until
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* wait_sync_index has been completed later. The frontend may perform
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* layout transitions on the image, so even read-only access is not defined.
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* The exception to read-only rule is if GENERAL layout is used for the image.
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* In this case, the frontend is not allowed to perform any layout transitions,
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* so concurrent reads from core and frontend are allowed.
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*
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* If frame duping is used, or if set_command_buffers is used,
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* the frontend will not wait for any semaphores.
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*
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* The src_queue_family is used to specify which queue family
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* the image is currently owned by. If using multiple queue families
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* (e.g. async compute), the frontend will need to acquire ownership of the
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* image before rendering with it and release the image afterwards.
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*
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* If src_queue_family is equal to the queue family (queue_index),
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* no ownership transfer will occur.
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* Similarly, if src_queue_family is VK_QUEUE_FAMILY_IGNORED,
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* no ownership transfer will occur.
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*
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* The frontend will always release ownership back to src_queue_family.
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* Waiting for frontend to complete with wait_sync_index() ensures that
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* the frontend has released ownership back to the application.
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* Note that in Vulkan, transfering ownership is a two-part process.
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*
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* Example frame:
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* - core releases ownership from src_queue_index to queue_index with VkImageMemoryBarrier.
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* - core calls set_image with src_queue_index.
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* - Frontend will acquire the image with src_queue_index -> queue_index as well, completing the ownership transfer.
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* - Frontend renders the frame.
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* - Frontend releases ownership with queue_index -> src_queue_index.
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* - Next time image is used, core must acquire ownership from queue_index ...
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*
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* Since the frontend releases ownership, we cannot necessarily dupe the frame because
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* the core needs to make the roundtrip of ownership transfer.
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*/
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retro_vulkan_set_image_t set_image;
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/* Get the current sync index for this frame which is obtained in
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* frontend by calling e.g. vkAcquireNextImageKHR before calling
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* retro_run().
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*
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* This index will correspond to which swapchain buffer is currently
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* the active one.
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*
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* Knowing this index is very useful for maintaining safe asynchronous CPU
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* and GPU operation without stalling.
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*
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* The common pattern for synchronization is to receive fences when
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* submitting command buffers to Vulkan (vkQueueSubmit) and add this fence
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* to a list of fences for frame number get_sync_index().
|
|
*
|
|
* Next time we receive the same get_sync_index(), we can wait for the
|
|
* fences from before, which will usually return immediately as the
|
|
* frontend will generally also avoid letting the GPU run ahead too much.
|
|
*
|
|
* After the fence has signaled, we know that the GPU has completed all
|
|
* GPU work related to work submitted in the frame we last saw get_sync_index().
|
|
*
|
|
* This means we can safely reuse or free resources allocated in this frame.
|
|
*
|
|
* In theory, even if we wait for the fences correctly, it is not technically
|
|
* safe to write to the image we earlier passed to the frontend since we're
|
|
* not waiting for the frontend GPU jobs to complete.
|
|
*
|
|
* The frontend will guarantee that the appropriate pipeline barrier
|
|
* in graphics_queue has been used such that
|
|
* VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT cannot
|
|
* start until the frontend is done with the image.
|
|
*/
|
|
retro_vulkan_get_sync_index_t get_sync_index;
|
|
|
|
/* Returns a bitmask of how many swapchain images we currently have
|
|
* in the frontend.
|
|
*
|
|
* If bit #N is set in the return value, get_sync_index can return N.
|
|
* Knowing this value is useful for preallocating per-frame management
|
|
* structures ahead of time.
|
|
*
|
|
* While this value will typically remain constant throughout the
|
|
* applications lifecycle, it may for example change if the frontend
|
|
* suddently changes fullscreen state and/or latency.
|
|
*
|
|
* If this value ever changes, it is safe to assume that the device
|
|
* is completely idle and all synchronization objects can be deleted
|
|
* right away as desired.
|
|
*/
|
|
retro_vulkan_get_sync_index_mask_t get_sync_index_mask;
|
|
|
|
/* Instead of submitting the command buffer to the queue first, the core
|
|
* can pass along its command buffer to the frontend, and the frontend
|
|
* will submit the command buffer together with the frontends command buffers.
|
|
*
|
|
* This has the advantage that the overhead of vkQueueSubmit can be
|
|
* amortized into a single call. For this mode, semaphores in set_image
|
|
* will be ignored, so vkCmdPipelineBarrier must be used to synchronize
|
|
* the core and frontend.
|
|
*
|
|
* The command buffers in set_command_buffers are only executed once,
|
|
* even if frame duping is used.
|
|
*
|
|
* If frame duping is used, set_image should be used for the frames
|
|
* which should be duped instead.
|
|
*
|
|
* Command buffers passed to the frontend with set_command_buffers
|
|
* must not actually be submitted to the GPU until retro_video_refresh_t
|
|
* is called.
|
|
*
|
|
* The frontend must submit the command buffer before submitting any
|
|
* other command buffers provided by set_command_buffers. */
|
|
retro_vulkan_set_command_buffers_t set_command_buffers;
|
|
|
|
/* Waits on CPU for device activity for the current sync index to complete.
|
|
* This is useful since the core will not have a relevant fence to sync with
|
|
* when the frontend is submitting the command buffers. */
|
|
retro_vulkan_wait_sync_index_t wait_sync_index;
|
|
|
|
/* If the core submits command buffers itself to any of the queues provided
|
|
* in this interface, the core must lock and unlock the frontend from
|
|
* racing on the VkQueue.
|
|
*
|
|
* Queue submission can happen on any thread.
|
|
* Even if queue submission happens on the same thread as retro_run(),
|
|
* the lock/unlock functions must still be called.
|
|
*
|
|
* NOTE: Queue submissions are heavy-weight. */
|
|
retro_vulkan_lock_queue_t lock_queue;
|
|
retro_vulkan_unlock_queue_t unlock_queue;
|
|
|
|
/* Sets a semaphore which is signaled when the image in set_image can safely be reused.
|
|
* The semaphore is consumed next call to retro_video_refresh_t.
|
|
* The semaphore will be signalled even for duped frames.
|
|
* The semaphore will be signalled only once, so set_signal_semaphore should be called every frame.
|
|
* The semaphore may be VK_NULL_HANDLE, which disables semaphore signalling for next call to retro_video_refresh_t.
|
|
*
|
|
* This is mostly useful to support use cases where you're rendering to a single image that
|
|
* is recycled in a ping-pong fashion with the frontend to save memory (but potentially less throughput).
|
|
*/
|
|
retro_vulkan_set_signal_semaphore_t set_signal_semaphore;
|
|
};
|
|
|
|
#endif
|