From 4bf83d4b3ba578a244c38945d002d6d24f439b54 Mon Sep 17 00:00:00 2001 From: Bas Nieuwenhuizen Date: Mon, 21 Feb 2022 18:43:54 +0100 Subject: [PATCH] STEAMOS: Dynamic swapchain override for gamescope limiter --- src/loader/loader_dri3_helper.c | 42 +++++++++++++++++++++++++++++++-- src/loader/loader_dri3_helper.h | 1 + src/loader/meson.build | 2 +- src/vulkan/wsi/wsi_common_x11.c | 38 +++++++++++++++++++++++++++++ 4 files changed, 80 insertions(+), 3 deletions(-) diff --git a/src/loader/loader_dri3_helper.c b/src/loader/loader_dri3_helper.c index 32135770e9d..abc79dda97e 100644 --- a/src/loader/loader_dri3_helper.c +++ b/src/loader/loader_dri3_helper.c @@ -289,6 +289,30 @@ dri3_update_max_num_back(struct loader_dri3_drawable *draw) } } +static unsigned +gamescope_swapchain_override() +{ + const char *path = getenv("GAMESCOPE_LIMITER_FILE"); + if (!path) + return 0; + + static simple_mtx_t mtx = SIMPLE_MTX_INITIALIZER; + static int fd = -1; + + simple_mtx_lock(&mtx); + if (fd < 0) { + fd = open(path, O_RDONLY); + } + simple_mtx_unlock(&mtx); + + if (fd < 0) + return 0; + + uint32_t override_value = 0; + pread(fd, &override_value, sizeof(override_value), 0); + return override_value; +} + void loader_dri3_set_swap_interval(struct loader_dri3_drawable *draw, int interval) { @@ -303,10 +327,12 @@ loader_dri3_set_swap_interval(struct loader_dri3_drawable *draw, int interval) * PS. changing from value A to B and A < B won't cause swap out of order but * may still gets wrong target_msc value at the beginning. */ - if (draw->swap_interval != interval) + if (draw->orig_swap_interval != interval) loader_dri3_swapbuffer_barrier(draw); - draw->swap_interval = interval; + draw->orig_swap_interval = interval; + if (gamescope_swapchain_override() != 1) + draw->swap_interval = interval; } static void @@ -438,6 +464,12 @@ loader_dri3_drawable_init(xcb_connection_t *conn, draw->swap_interval = dri_get_initial_swap_interval(draw->dri_screen_render_gpu, draw->ext->config); + draw->orig_swap_interval = draw->swap_interval; + + unsigned gamescope_override = gamescope_swapchain_override(); + if (gamescope_override == 1) + draw->swap_interval = 1; + dri3_update_max_num_back(draw); /* Create a new drawable */ @@ -1092,6 +1124,12 @@ loader_dri3_swap_buffers_msc(struct loader_dri3_drawable *draw, if (draw->type == LOADER_DRI3_DRAWABLE_WINDOW) { dri3_fence_reset(draw->conn, back); + unsigned gamescope_override = gamescope_swapchain_override(); + if (gamescope_override == 1) + draw->swap_interval = 1; + else + draw->swap_interval = draw->orig_swap_interval; + /* Compute when we want the frame shown by taking the last known * successful MSC and adding in a swap interval for each outstanding swap * request. target_msc=divisor=remainder=0 means "Use glXSwapBuffers() diff --git a/src/loader/loader_dri3_helper.h b/src/loader/loader_dri3_helper.h index 1fd340bd145..b8f5eaaf190 100644 --- a/src/loader/loader_dri3_helper.h +++ b/src/loader/loader_dri3_helper.h @@ -178,6 +178,7 @@ struct loader_dri3_drawable { bool block_on_depleted_buffers; bool queries_buffer_age; int swap_interval; + int orig_swap_interval; struct loader_dri3_extensions *ext; const struct loader_dri3_vtable *vtable; diff --git a/src/loader/meson.build b/src/loader/meson.build index 35f9991ba2f..154cf809a69 100644 --- a/src/loader/meson.build +++ b/src/loader/meson.build @@ -29,7 +29,7 @@ if with_platform_x11 and with_dri3 dependencies : [ idep_mesautil, dep_libdrm, dep_xcb_dri3, dep_xcb_present, dep_xcb_sync, dep_xshmfence, - dep_xcb_xfixes, + dep_xcb_xfixes, dep_xcb_xrandr, idep_mesautil ], build_by_default : false, ) diff --git a/src/vulkan/wsi/wsi_common_x11.c b/src/vulkan/wsi/wsi_common_x11.c index a42355971a7..5ed89cba8d0 100644 --- a/src/vulkan/wsi/wsi_common_x11.c +++ b/src/vulkan/wsi/wsi_common_x11.c @@ -42,6 +42,7 @@ #include "util/hash_table.h" #include "util/os_file.h" #include "util/os_time.h" +#include "util/simple_mtx.h" #include "util/u_debug.h" #include "util/u_thread.h" #include "util/xmlconfig.h" @@ -198,6 +199,30 @@ wsi_x11_detect_xwayland(xcb_connection_t *conn, return is_xwayland; } +static unsigned +gamescope_swapchain_override() +{ + const char *path = getenv("GAMESCOPE_LIMITER_FILE"); + if (!path) + return 0; + + static simple_mtx_t mtx = SIMPLE_MTX_INITIALIZER; + static int fd = -1; + + simple_mtx_lock(&mtx); + if (fd < 0) { + fd = open(path, O_RDONLY); + } + simple_mtx_unlock(&mtx); + + if (fd < 0) + return 0; + + uint32_t override_value = 0; + pread(fd, &override_value, sizeof(override_value), 0); + return override_value; +} + static struct wsi_x11_connection * wsi_x11_connection_create(struct wsi_device *wsi_dev, xcb_connection_t *conn) @@ -1074,6 +1099,8 @@ struct x11_swapchain { /* Total number of images returned to application in AcquireNextImage. */ uint64_t present_poll_acquire_count; + VkPresentModeKHR orig_present_mode; + struct x11_image images[0]; }; VK_DEFINE_NONDISP_HANDLE_CASTS(x11_swapchain, base.base, VkSwapchainKHR, @@ -1802,6 +1829,12 @@ x11_queue_present(struct wsi_swapchain *anv_chain, if (chain->status < 0) return chain->status; + unsigned gamescope_override = gamescope_swapchain_override(); + if ((gamescope_override == 1 && chain->base.present_mode != VK_PRESENT_MODE_FIFO_KHR) || + (gamescope_override != 1 && chain->base.present_mode != chain->orig_present_mode)) { + return x11_swapchain_result(chain, VK_ERROR_OUT_OF_DATE_KHR); + } + if (damage && damage->pRectangles && damage->rectangleCount > 0 && damage->rectangleCount <= MAX_DAMAGE_RECTS) { xcb_rectangle_t rects[MAX_DAMAGE_RECTS]; @@ -2554,6 +2587,10 @@ x11_surface_create_swapchain(VkIcdSurfaceBase *icd_surface, xcb_void_cookie_t cookie; VkResult result; VkPresentModeKHR present_mode = wsi_swapchain_get_present_mode(wsi_device, pCreateInfo); + VkPresentModeKHR orig_present_mode = present_mode; + + if (gamescope_swapchain_override() == 1) + present_mode = VK_PRESENT_MODE_FIFO_KHR; assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR); @@ -2666,6 +2703,7 @@ x11_surface_create_swapchain(VkIcdSurfaceBase *icd_surface, chain->base.wait_for_present = x11_wait_for_present; chain->base.release_images = x11_release_images; chain->base.present_mode = present_mode; + chain->orig_present_mode = orig_present_mode; chain->base.image_count = num_images; chain->conn = conn; chain->window = window; -- GitLab