From d8525fbd63cbc24749e54a1fc50b18e6108ac2c0 Mon Sep 17 00:00:00 2001
From: Vaxry <vaxry@vaxry.net>
Date: Sat, 6 Jul 2024 17:45:47 +0200
Subject: [PATCH] drm: check for timeline support for explicit sync

---
 include/aquamarine/backend/DRM.hpp | 5 +++--
 src/backend/drm/DRM.cpp            | 4 +++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/aquamarine/backend/DRM.hpp b/include/aquamarine/backend/DRM.hpp
index 84c93b3..e4e7b00 100644
--- a/include/aquamarine/backend/DRM.hpp
+++ b/include/aquamarine/backend/DRM.hpp
@@ -44,12 +44,12 @@ namespace Aquamarine {
 
     class CDRMLease {
       public:
-        static Hyprutils::Memory::CSharedPointer<CDRMLease>      create(std::vector<Hyprutils::Memory::CSharedPointer<IOutput>> outputs);
+        static Hyprutils::Memory::CSharedPointer<CDRMLease> create(std::vector<Hyprutils::Memory::CSharedPointer<IOutput>> outputs);
         ~CDRMLease();
 
         void                                                     terminate();
 
-        int                                                      leaseFD = -1;
+        int                                                      leaseFD  = -1;
         uint32_t                                                 lesseeID = 0;
         Hyprutils::Memory::CWeakPointer<CDRMBackend>             backend;
         std::vector<Hyprutils::Memory::CWeakPointer<CDRMOutput>> outputs;
@@ -363,6 +363,7 @@ namespace Aquamarine {
             Hyprutils::Math::Vector2D cursorSize;
             bool                      supportsAsyncCommit     = false;
             bool                      supportsAddFb2Modifiers = false;
+            bool                      supportsTimelines       = false;
         } drmProps;
 
         struct {
diff --git a/src/backend/drm/DRM.cpp b/src/backend/drm/DRM.cpp
index 76e0f94..7b5e237 100644
--- a/src/backend/drm/DRM.cpp
+++ b/src/backend/drm/DRM.cpp
@@ -342,6 +342,7 @@ bool Aquamarine::CDRMBackend::checkFeatures() {
 
     drmProps.supportsAsyncCommit     = drmGetCap(gpu->fd, DRM_CAP_ASYNC_PAGE_FLIP, &cap) == 0 && cap == 1;
     drmProps.supportsAddFb2Modifiers = drmGetCap(gpu->fd, DRM_CAP_ADDFB2_MODIFIERS, &cap) == 0 && cap == 1;
+    drmProps.supportsTimelines       = drmGetCap(gpu->fd, DRM_CAP_SYNCOBJ_TIMELINE, &cap) == 0 && cap == 1;
 
     if (envEnabled("AQ_NO_ATOMIC")) {
         backend->log(AQ_LOG_WARNING, "drm: AQ_NO_ATOMIC enabled, using the legacy drm iface");
@@ -358,6 +359,7 @@ bool Aquamarine::CDRMBackend::checkFeatures() {
 
     backend->log(AQ_LOG_DEBUG, std::format("drm: drmProps.supportsAsyncCommit: {}", drmProps.supportsAsyncCommit));
     backend->log(AQ_LOG_DEBUG, std::format("drm: drmProps.supportsAddFb2Modifiers: {}", drmProps.supportsAddFb2Modifiers));
+    backend->log(AQ_LOG_DEBUG, std::format("drm: drmProps.supportsTimelines: {}", drmProps.supportsTimelines));
 
     // TODO: allow no-modifiers?
 
@@ -1050,7 +1052,7 @@ void Aquamarine::SDRMConnector::connect(drmModeConnector* connector) {
     output->serial           = serial;
     output->description      = std::format("{} {} {} ({})", make, model, serial, szName);
     output->needsFrame       = true;
-    output->supportsExplicit = crtc->props.out_fence_ptr && crtc->primary->props.in_fence_fd;
+    output->supportsExplicit = backend->drmProps.supportsTimelines && crtc->props.out_fence_ptr && crtc->primary->props.in_fence_fd;
 
     backend->backend->log(AQ_LOG_DEBUG, std::format("drm: Explicit sync {}", output->supportsExplicit ? "supported" : "unsupported"));