mirror of
https://github.com/libretro/RetroArch
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38a305bb6e
Allows cores to avoid linking directly against any extra library. Update HW interface version to 2 to signal ABI change. Note that the interface is still experimental and can change at any time.
264 lines
11 KiB
C
264 lines
11 KiB
C
/* Copyright (C) 2010-2016 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 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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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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/* 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_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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* 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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* If frame duping is used, the frontend will not wait for any semaphores.
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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().
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*
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* Next time we receive the same get_sync_index(), we can wait for the
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* fences from before, which will usually return immediately as the
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* frontend will generally also avoid letting the GPU run ahead too much.
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*
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* After the fence has signaled, we know that the GPU has completed all
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* GPU work related to work submitted in the frame we last saw get_sync_index().
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*
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* This means we can safely reuse or free resources allocated in this frame.
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*
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* In theory, even if we wait for the fences correctly, it is not technically
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* safe to write to the image we earlier passed to the frontend since we're
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* not waiting for the frontend GPU jobs to complete.
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*
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* The frontend will guarantee that the appropriate pipeline barrier
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* in graphics_queue has been used such that
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* VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT cannot
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* start until the frontend is done with the image.
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*/
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retro_vulkan_get_sync_index_t get_sync_index;
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/* Returns a bitmask of how many swapchain images we currently have
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* in the frontend.
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*
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* If bit #N is set in the return value, get_sync_index can return N.
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* Knowing this value is useful for preallocating per-frame management
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* structures ahead of time.
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*
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* While this value will typically remain constant throughout the
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* applications lifecycle, it may for example change if the frontend
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* suddently changes fullscreen state and/or latency.
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*
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* If this value ever changes, it is safe to assume that the device
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* is completely idle and all synchronization objects can be deleted
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* right away as desired.
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*/
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retro_vulkan_get_sync_index_mask_t get_sync_index_mask;
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/* Instead of submitting the command buffer to the queue first, the core
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* can pass along its command buffer to the frontend, and the frontend
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* will submit the command buffer together with the frontends command buffers.
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*
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* This has the advantage that the overhead of vkQueueSubmit can be
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* amortized into a single call. For this mode, semaphores in set_image
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* will be ignored, so vkCmdPipelineBarrier must be used to synchronize
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* the core and frontend.
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*
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* The command buffers in set_command_buffers are only executed once,
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* even if frame duping is used.
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*
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* If frame duping is used, set_image should be used for the frames
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* which should be duped instead.
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*
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* Command buffers passed to the frontend with set_command_buffers
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* must not actually be submitted to the GPU until retro_video_refresh_t
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* is called.
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*
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* The frontend must submit the command buffer before submitting any
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* other command buffers provided by set_command_buffers. */
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retro_vulkan_set_command_buffers_t set_command_buffers;
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/* Waits on CPU for device activity for the current sync index to complete.
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* This is useful since the core will not have a relevant fence to sync with
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* when the frontend is submitting the command buffers. */
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retro_vulkan_wait_sync_index_t wait_sync_index;
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/* If the core submits command buffers itself to any of the queues provided
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* in this interface, the core must lock and unlock the frontend from
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* racing on the VkQueue.
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*
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* Queue submission can happen on any thread.
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* Even if queue submission happens on the same thread as retro_run(),
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* the lock/unlock functions must still be called.
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*
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* NOTE: Queue submissions are heavy-weight. */
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retro_vulkan_lock_queue_t lock_queue;
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retro_vulkan_unlock_queue_t unlock_queue;
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};
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#endif
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