Wayland: primitive but working backend

This implements enough for wayland to be a functioning backend.

CMakeLists.txt

@@ -16,7 +16,7 @@ set(INCLUDE ${CMAKE_INSTALL_FULL_INCLUDEDIR})
 set(LIBDIR ${CMAKE_INSTALL_FULL_LIBDIR})
 
 find_package(PkgConfig REQUIRED)
-pkg_check_modules(deps REQUIRED IMPORTED_TARGET wayland-client wayland-protocols hyprutils>=0.1.2 pixman-1 wayland-client)
+pkg_check_modules(deps REQUIRED IMPORTED_TARGET wayland-client wayland-protocols hyprutils>=0.1.2 pixman-1 wayland-client libdrm gbm)
 
 configure_file(aquamarine.pc.in aquamarine.pc @ONLY)
 
@@ -77,6 +77,7 @@ endfunction()
 protocolWayland()
 
 protocolNew("stable/xdg-shell" "xdg-shell" false)
+protocolNew("stable/linux-dmabuf" "linux-dmabuf-v1" false)
 
 # tests
 add_custom_target(tests)

include/aquamarine/allocator/Allocator.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <hyprutils/memory/SharedPtr.hpp>
+#include "../buffer/Buffer.hpp"
+#include <drm_fourcc.h>
+
+namespace Aquamarine {
+    class CBackend;
+
+    struct SAllocatorBufferParams {
+        Hyprutils::Math::Vector2D size;
+        uint32_t                  format = DRM_FORMAT_INVALID;
+    };
+
+    class IAllocator {
+      public:
+        virtual Hyprutils::Memory::CSharedPointer<IBuffer>  acquire(const SAllocatorBufferParams& params) = 0;
+        virtual Hyprutils::Memory::CSharedPointer<CBackend> getBackend()                                  = 0;
+    };
+};

include/aquamarine/allocator/GBM.hpp

@@ -0,0 +1,61 @@
+#pragma once
+
+#include "Allocator.hpp"
+
+struct gbm_device;
+struct gbm_bo;
+
+namespace Aquamarine {
+    class CGBMAllocator;
+    class CBackend;
+
+    class CGBMBuffer : public IBuffer {
+      public:
+        virtual ~CGBMBuffer();
+
+        virtual eBufferCapability caps();
+        virtual eBufferType       type();
+        virtual void              update(const Hyprutils::Math::CRegion& damage);
+        virtual bool              isSynchronous();
+        virtual bool              good();
+        virtual SDMABUFAttrs      dmabuf();
+
+      private:
+        CGBMBuffer(const SAllocatorBufferParams& params, Hyprutils::Memory::CWeakPointer<CGBMAllocator> allocator_);
+
+        Hyprutils::Memory::CWeakPointer<CGBMAllocator> allocator;
+
+        // gbm stuff
+        gbm_bo*      bo = nullptr;
+        SDMABUFAttrs attrs{.success = false};
+
+        friend class CGBMAllocator;
+    };
+
+    class CGBMAllocator : public IAllocator {
+      public:
+        static Hyprutils::Memory::CSharedPointer<CGBMAllocator> create(int drmfd_, Hyprutils::Memory::CWeakPointer<CBackend> backend_);
+
+        virtual Hyprutils::Memory::CSharedPointer<IBuffer>      acquire(const SAllocatorBufferParams& params);
+        virtual Hyprutils::Memory::CSharedPointer<CBackend> getBackend();
+
+        //
+        Hyprutils::Memory::CWeakPointer<CGBMAllocator> self;
+
+      private:
+        CGBMAllocator(int fd_, Hyprutils::Memory::CWeakPointer<CBackend> backend_);
+
+        // a vector purely for tracking (debugging) the buffers and nothing more
+        std::vector<Hyprutils::Memory::CWeakPointer<CGBMBuffer>> buffers;
+
+        int                                                      fd = -1;
+        Hyprutils::Memory::CWeakPointer<CBackend>                backend;
+
+        // gbm stuff
+        gbm_device* gbmDevice            = nullptr;
+        std::string gbmDeviceBackendName = "";
+        std::string drmName              = "";
+
+        friend class CGBMBuffer;
+    };
+};

include/aquamarine/allocator/Swapchain.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "Allocator.hpp"
+
+namespace Aquamarine {
+
+    struct SSwapchainOptions {
+        size_t                    length = 0;
+        Hyprutils::Math::Vector2D size;
+        uint32_t                  format = DRM_FORMAT_INVALID;
+    };
+
+    class CSwapchain {
+      public:
+        CSwapchain(Hyprutils::Memory::CSharedPointer<IAllocator> allocator_);
+
+        bool                                       reconfigure(const SSwapchainOptions& options_);
+
+        bool                                       contains(Hyprutils::Memory::CSharedPointer<IBuffer> buffer);
+        Hyprutils::Memory::CSharedPointer<IBuffer> next(int* age);
+
+      private:
+        bool fullReconfigure(const SSwapchainOptions& options_);
+        bool resize(size_t newSize);
+
+        //
+        SSwapchainOptions                                       options;
+        Hyprutils::Memory::CSharedPointer<IAllocator>           allocator;
+        std::vector<Hyprutils::Memory::CSharedPointer<IBuffer>> buffers;
+        int                                                     lastAcquired = 0;
+    };
+};

include/aquamarine/backend/Backend.hpp

@@ -6,6 +6,7 @@
 #include <functional>
 #include <mutex>
 #include <condition_variable>
+#include "../allocator/Allocator.hpp"
 
 namespace Aquamarine {
     enum eBackendType {
@@ -56,6 +57,7 @@ namespace Aquamarine {
         virtual eBackendType type()           = 0;
         virtual bool         start()          = 0;
         virtual int          pollFD()         = 0;
+        virtual int          drmFD()          = 0;
         virtual bool         dispatchEvents() = 0;
     };
 
@@ -82,6 +84,8 @@ namespace Aquamarine {
             Hyprutils::Signal::CSignal newTouch;
         } events;
 
+        Hyprutils::Memory::CSharedPointer<IAllocator> allocator;
+
       private:
         CBackend();
 
@@ -90,6 +94,7 @@ namespace Aquamarine {
         std::vector<SBackendImplementationOptions>                             implementationOptions;
         std::vector<Hyprutils::Memory::CSharedPointer<IBackendImplementation>> implementations;
         SBackendOptions                                                        options;
+        Hyprutils::Memory::CWeakPointer<CBackend>                              self;
 
         //
         struct {

include/aquamarine/backend/Wayland.hpp

@@ -1,21 +1,44 @@
 #pragma once
 
 #include "./Backend.hpp"
+#include "../allocator/Swapchain.hpp"
 #include "../output/Output.hpp"
 #include "../input/Input.hpp"
 #include <hyprutils/memory/WeakPtr.hpp>
 #include <wayland-client.h>
 #include <wayland.hpp>
 #include <xdg-shell.hpp>
+#include <linux-dmabuf-v1.hpp>
+#include <tuple>
 
 namespace Aquamarine {
     class CBackend;
     class CWaylandBackend;
+    class CWaylandOutput;
+
+    class CWaylandBuffer {
+      public:
+        CWaylandBuffer(Hyprutils::Memory::CSharedPointer<IBuffer> buffer_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_);
+        ~CWaylandBuffer();
+        bool good();
+
+        bool pendingRelease = false;
+
+      private:
+        struct {
+            Hyprutils::Memory::CSharedPointer<CWlBuffer> buffer;
+        } waylandState;
+
+        Hyprutils::Memory::CWeakPointer<IBuffer>         buffer;
+        Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend;
+
+        friend class CWaylandOutput;
+    };
 
     class CWaylandOutput : public IOutput {
       public:
         virtual ~CWaylandOutput();
-        virtual void commit();
+        virtual bool commit();
 
       private:
         CWaylandOutput(const std::string& name_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_);
@@ -23,10 +46,19 @@ namespace Aquamarine {
         std::string                                       name;
         Hyprutils::Memory::CWeakPointer<CWaylandBackend>  backend;
 
+        Hyprutils::Memory::CSharedPointer<CWaylandBuffer> wlBufferFromBuffer(Hyprutils::Memory::CSharedPointer<IBuffer> buffer);
+
+        void                                              sendFrameAndSetCallback();
+
+        struct {
+            std::vector<std::pair<Hyprutils::Memory::CWeakPointer<IBuffer>, Hyprutils::Memory::CSharedPointer<CWaylandBuffer>>> buffers;
+        } backendState;
+
         struct {
             Hyprutils::Memory::CSharedPointer<CWlSurface>   surface;
             Hyprutils::Memory::CSharedPointer<CXdgSurface>  xdgSurface;
             Hyprutils::Memory::CSharedPointer<CXdgToplevel> xdgToplevel;
+            Hyprutils::Memory::CSharedPointer<CWlCallback>  frameCallback;
         } waylandState;
 
         friend class CWaylandBackend;
@@ -67,6 +99,7 @@ namespace Aquamarine {
         virtual eBackendType                             type();
         virtual bool                                     start();
         virtual int                                      pollFD();
+        virtual int                                      drmFD();
         virtual bool                                     dispatchEvents();
 
         Hyprutils::Memory::CWeakPointer<CWaylandBackend> self;
@@ -76,6 +109,7 @@ namespace Aquamarine {
 
         void initSeat();
         void initShell();
+        bool initDmabuf();
         void createOutput(const std::string& szName);
 
         //
@@ -96,11 +130,22 @@ namespace Aquamarine {
             Hyprutils::Memory::CSharedPointer<CWlSeat>                   seat;
             Hyprutils::Memory::CSharedPointer<CXdgWmBase>                xdg;
             Hyprutils::Memory::CSharedPointer<CWlCompositor>             compositor;
+            Hyprutils::Memory::CSharedPointer<CZwpLinuxDmabufV1>         dmabuf;
+            Hyprutils::Memory::CSharedPointer<CZwpLinuxDmabufFeedbackV1> dmabufFeedback;
+
+            // control
+            bool dmabufFailed = false;
         } waylandState;
 
+        struct {
+            int         fd       = -1;
+            std::string nodeName = "";
+        } drmState;
+
         friend class CBackend;
         friend class CWaylandKeyboard;
         friend class CWaylandPointer;
         friend class CWaylandOutput;
+        friend class CWaylandBuffer;
     };
 };

include/aquamarine/buffer/Buffer.hpp

@@ -49,6 +49,7 @@ namespace Aquamarine {
         virtual eBufferType                            type()                                         = 0;
         virtual void                                   update(const Hyprutils::Math::CRegion& damage) = 0;
         virtual bool                                   isSynchronous() = 0; // whether the updates to this buffer are synchronous, aka happen over cpu
+        virtual bool                                   good()          = 0;
         virtual SDMABUFAttrs                           dmabuf();
         virtual SSHMAttrs                              shm();
         virtual std::tuple<uint8_t*, uint32_t, size_t> beginDataPtr(uint32_t flags);

include/aquamarine/output/Output.hpp

@@ -4,6 +4,9 @@
 #include <hyprutils/signal/Signal.hpp>
 #include <hyprutils/memory/SharedPtr.hpp>
 #include <hyprutils/math/Region.hpp>
+#include <drm_fourcc.h>
+#include "../allocator/Swapchain.hpp"
+#include "../buffer/Buffer.hpp"
 
 namespace Aquamarine {
     struct SOutputMode {
@@ -21,8 +24,6 @@ namespace Aquamarine {
 
     class COutputState {
       public:
-        COutputState(Hyprutils::Memory::CSharedPointer<IOutput> parent);
-
         Hyprutils::Math::CRegion                     damage;
         bool                                         enabled          = false;
         bool                                         adaptiveSync     = false;
@@ -30,6 +31,9 @@ namespace Aquamarine {
         std::vector<uint16_t>                        gammaLut;
         Hyprutils::Math::Vector2D                    lastModeSize;
         Hyprutils::Memory::CWeakPointer<SOutputMode> mode;
+        std::optional<SOutputMode>                   customMode;
+        uint32_t                                     drmFormat = DRM_FORMAT_INVALID;
+        Hyprutils::Memory::CSharedPointer<IBuffer>   buffer;
     };
 
     class IOutput {
@@ -38,7 +42,7 @@ namespace Aquamarine {
             ;
         }
 
-        virtual void              commit() = 0;
+        virtual bool              commit() = 0;
 
         std::string               name, description, make, model, serial;
         Hyprutils::Math::Vector2D physicalSize;
@@ -48,7 +52,8 @@ namespace Aquamarine {
 
         //
         std::vector<Hyprutils::Memory::CSharedPointer<SOutputMode>> modes;
-        Hyprutils::Memory::CSharedPointer<COutputState>             state;
+        Hyprutils::Memory::CSharedPointer<COutputState>             state = Hyprutils::Memory::makeShared<COutputState>();
+        Hyprutils::Memory::CSharedPointer<CSwapchain>               swapchain;
 
         //
         struct SStateEvent {

src/allocator/GBM.cpp

@@ -0,0 +1,147 @@
+#include <aquamarine/allocator/GBM.hpp>
+#include <aquamarine/backend/Backend.hpp>
+#include "FormatUtils.hpp"
+#include <xf86drm.h>
+#include <gbm.h>
+
+using namespace Aquamarine;
+using namespace Hyprutils::Memory;
+#define SP CSharedPointer
+
+Aquamarine::CGBMBuffer::CGBMBuffer(const SAllocatorBufferParams& params, Hyprutils::Memory::CWeakPointer<CGBMAllocator> allocator_) : allocator(allocator_) {
+    if (!allocator)
+        return;
+
+    attrs.size   = params.size;
+    attrs.format = params.format;
+
+    // FIXME: proper modifier support? This might implode on some GPUs on the Wayland backend
+    // for sure.
+
+    bo = gbm_bo_create(allocator->gbmDevice, params.size.x, params.size.y, params.format, GBM_BO_USE_RENDERING);
+
+    if (!bo) {
+        allocator->backend->log(AQ_LOG_ERROR, "GBM: Failed to allocate a GBM buffer: bo null");
+        return;
+    }
+
+    attrs.planes   = gbm_bo_get_plane_count(bo);
+    attrs.modifier = gbm_bo_get_modifier(bo);
+
+    for (size_t i = 0; i < (size_t)attrs.planes; ++i) {
+        attrs.strides.at(i) = gbm_bo_get_stride_for_plane(bo, i);
+        attrs.offsets.at(i) = gbm_bo_get_offset(bo, i);
+        attrs.fds.at(i)     = gbm_bo_get_fd_for_plane(bo, i);
+
+        if (attrs.fds.at(i) < 0) {
+            allocator->backend->log(AQ_LOG_ERROR, std::format("GBM: Failed to query fd for plane {}", i));
+            for (size_t j = 0; j < i; ++j) {
+                close(attrs.fds.at(j));
+            }
+            attrs.planes = 0;
+            return;
+        }
+    }
+
+    attrs.success = true;
+
+    auto modName = drmGetFormatModifierName(attrs.modifier);
+
+    allocator->backend->log(
+        AQ_LOG_ERROR,
+        std::format("GBM: Allocated a new buffer with size {} and format {} with modifier {}", attrs.size, fourccToName(attrs.format), modName ? modName : "Unknown"));
+
+    free(modName);
+}
+
+Aquamarine::CGBMBuffer::~CGBMBuffer() {
+    if (bo)
+        gbm_bo_destroy(bo);
+    for (size_t i = 0; i < (size_t)attrs.planes; i++)
+        close(attrs.fds.at(i));
+}
+
+eBufferCapability Aquamarine::CGBMBuffer::caps() {
+    return (Aquamarine::eBufferCapability)0;
+}
+
+eBufferType Aquamarine::CGBMBuffer::type() {
+    return Aquamarine::eBufferType::BUFFER_TYPE_DMABUF;
+}
+
+void Aquamarine::CGBMBuffer::update(const Hyprutils::Math::CRegion& damage) {
+    ;
+}
+
+bool Aquamarine::CGBMBuffer::isSynchronous() {
+    return false;
+}
+
+bool Aquamarine::CGBMBuffer::good() {
+    return true;
+}
+
+SDMABUFAttrs Aquamarine::CGBMBuffer::dmabuf() {
+    return attrs;
+}
+
+SP<CGBMAllocator> Aquamarine::CGBMAllocator::create(int drmfd_, Hyprutils::Memory::CWeakPointer<CBackend> backend_) {
+    uint64_t capabilities = 0;
+    if (drmGetCap(drmfd_, DRM_CAP_PRIME, &capabilities) || !(capabilities & DRM_PRIME_CAP_EXPORT)) {
+        backend_->log(AQ_LOG_ERROR, "Cannot create a GBM Allocator: PRIME export is not supported by the gpu.");
+        return nullptr;
+    }
+
+    auto allocator = SP<CGBMAllocator>(new CGBMAllocator(drmfd_, backend_));
+
+    if (!allocator->gbmDevice) {
+        backend_->log(AQ_LOG_ERROR, "Cannot create a GBM Allocator: gbm failed to create a device.");
+        return nullptr;
+    }
+
+    backend_->log(AQ_LOG_DEBUG, std::format("Created a GBM allocator with drm fd {}", drmfd_));
+
+    allocator->self = allocator;
+
+    return allocator;
+}
+
+Aquamarine::CGBMAllocator::CGBMAllocator(int fd_, Hyprutils::Memory::CWeakPointer<CBackend> backend_) : fd(fd_), backend(backend_) {
+    gbmDevice = gbm_create_device(fd_);
+    if (!gbmDevice) {
+        backend->log(AQ_LOG_ERROR, std::format("Couldn't open a GBM device at fd {}", fd_));
+        return;
+    }
+
+    gbmDeviceBackendName = gbm_device_get_backend_name(gbmDevice);
+    auto drmName_        = drmGetDeviceNameFromFd2(fd_);
+    drmName              = drmName_;
+    free(drmName_);
+}
+
+SP<IBuffer> Aquamarine::CGBMAllocator::acquire(const SAllocatorBufferParams& params) {
+    if (params.size.x < 1 || params.size.y < 1) {
+        backend->log(AQ_LOG_ERROR, std::format("Couldn't allocate a gbm buffer with invalid size {}", params.size));
+        return nullptr;
+    }
+
+    if (params.format == DRM_FORMAT_INVALID) {
+        backend->log(AQ_LOG_ERROR, "Couldn't allocate a gbm buffer with invalid format");
+        return nullptr;
+    }
+
+    auto newBuffer = SP<CGBMBuffer>(new CGBMBuffer(params, self));
+
+    if (!newBuffer->good()) {
+        backend->log(AQ_LOG_ERROR, std::format("Couldn't allocate a gbm buffer with size {} and format {}", params.size, fourccToName(params.format)));
+        return nullptr;
+    }
+
+    buffers.emplace_back(newBuffer);
+    std::erase_if(buffers, [](const auto& b) { return b.expired(); });
+    return newBuffer;
+}
+
+Hyprutils::Memory::CSharedPointer<CBackend> Aquamarine::CGBMAllocator::getBackend() {
+    return backend.lock();
+}

src/allocator/Swapchain.cpp

@@ -0,0 +1,93 @@
+#include <aquamarine/allocator/Swapchain.hpp>
+#include <aquamarine/backend/Backend.hpp>
+#include "FormatUtils.hpp"
+
+using namespace Aquamarine;
+using namespace Hyprutils::Memory;
+#define SP CSharedPointer
+
+Aquamarine::CSwapchain::CSwapchain(SP<IAllocator> allocator_) : allocator(allocator_) {
+    if (!allocator)
+        return;
+}
+
+bool Aquamarine::CSwapchain::reconfigure(const SSwapchainOptions& options_) {
+    if (!allocator)
+        return false;
+
+    if (options_.format == options.format && options_.size == options.size && options_.length == options.length)
+        return true; // no need to reconfigure
+
+    if (options_.format == options.format && options_.size == options.size) {
+        bool ok = resize(options_.length);
+        if (!ok)
+            return false;
+
+        options = options_;
+
+        allocator->getBackend()->log(AQ_LOG_DEBUG, std::format("Swapchain: Resized a {} {} swapchain to length {}", options.size, fourccToName(options.format), options.length));
+        return true;
+    }
+
+    bool ok = fullReconfigure(options_);
+    if (!ok)
+        return false;
+
+    options = options_;
+
+    allocator->getBackend()->log(AQ_LOG_DEBUG,
+                                 std::format("Swapchain: Reconfigured a swapchain to {} {} of length {}", options.size, fourccToName(options.format), options.length));
+    return true;
+}
+
+SP<IBuffer> Aquamarine::CSwapchain::next(int* age) {
+    if (!allocator || options.length <= 0)
+        return nullptr;
+
+    lastAcquired = (lastAcquired + 1) % options.length;
+
+    if (age)
+        *age = 1;
+
+    return buffers.at(lastAcquired);
+}
+
+bool Aquamarine::CSwapchain::fullReconfigure(const SSwapchainOptions& options_) {
+    buffers.clear();
+    for (size_t i = 0; i < options_.length; ++i) {
+        auto buf = allocator->acquire(SAllocatorBufferParams{.size = options_.size, .format = options_.format});
+        if (!buf) {
+            allocator->getBackend()->log(AQ_LOG_ERROR, "Swapchain: Failed acquiring a buffer");
+            return false;
+        }
+        buffers.emplace_back(buf);
+    }
+
+    return true;
+}
+
+bool Aquamarine::CSwapchain::resize(size_t newSize) {
+    if (newSize == buffers.size())
+        return true;
+
+    if (newSize < buffers.size()) {
+        while (buffers.size() > newSize) {
+            buffers.pop_back();
+        }
+    } else {
+        while (buffers.size() < newSize) {
+            auto buf = allocator->acquire(SAllocatorBufferParams{.size = options.size, .format = options.format});
+            if (!buf) {
+                allocator->getBackend()->log(AQ_LOG_ERROR, "Swapchain: Failed acquiring a buffer");
+                return false;
+            }
+            buffers.emplace_back(buf);
+        }
+    }
+
+    return true;
+}
+
+bool Aquamarine::CSwapchain::contains(Hyprutils::Memory::CSharedPointer<IBuffer> buffer) {
+    return std::find(buffers.begin(), buffers.end(), buffer) != buffers.end();
+}

src/backend/Backend.cpp

@@ -1,5 +1,6 @@
 #include <aquamarine/backend/Backend.hpp>
 #include <aquamarine/backend/Wayland.hpp>
+#include <aquamarine/allocator/GBM.hpp>
 #include <sys/poll.h>
 #include <thread>
 #include <chrono>
@@ -36,6 +37,10 @@ Hyprutils::Memory::CSharedPointer<CBackend> Aquamarine::CBackend::create(const s
 
     backend->options               = options;
     backend->implementationOptions = backends;
+    backend->self                  = backend;
+
+    if (backends.size() <= 0)
+        return nullptr;
 
     backend->log(AQ_LOG_DEBUG, "Creating an Aquamarine backend!");
 
@@ -87,6 +92,17 @@ bool Aquamarine::CBackend::start() {
     // erase failed impls
     std::erase_if(implementations, [](const auto& i) { return i->pollFD() < 0; });
 
+    // TODO: obviously change this when (if) we add different allocators.
+    for (auto& b : implementations) {
+        if (b->drmFD() >= 0) {
+            allocator = CGBMAllocator::create(b->drmFD(), self);
+            break;
+        }
+    }
+
+    if (!allocator)
+        return false;
+
     return true;
 }
 

src/backend/Wayland.cpp

@@ -1,6 +1,11 @@
 #include <aquamarine/backend/Wayland.hpp>
 #include <wayland.hpp>
 #include <xdg-shell.hpp>
+#include "Shared.hpp"
+#include <string.h>
+#include <xf86drm.h>
+#include <gbm.h>
+#include <fcntl.h>
 
 using namespace Aquamarine;
 using namespace Hyprutils::Memory;
@@ -8,13 +13,15 @@ using namespace Hyprutils::Math;
 #define SP CSharedPointer
 
 Aquamarine::CWaylandBackend::~CWaylandBackend() {
-    ;
+    if (drmState.fd >= 0)
+        close(drmState.fd);
 }
+
 eBackendType Aquamarine::CWaylandBackend::type() {
     return AQ_BACKEND_WAYLAND;
 }
 
-Aquamarine::CWaylandBackend::CWaylandBackend(Hyprutils::Memory::CSharedPointer<CBackend> backend_) : backend(backend_) {
+Aquamarine::CWaylandBackend::CWaylandBackend(SP<CBackend> backend_) : backend(backend_) {
     ;
 }
 
@@ -48,13 +55,21 @@ bool Aquamarine::CWaylandBackend::start() {
         } else if (NAME == "wl_compositor") {
             backend->log(AQ_LOG_TRACE, std::format("  > binding to global: {} (version {}) with id {}", name, 6, id));
             waylandState.compositor = makeShared<CWlCompositor>((wl_proxy*)wl_registry_bind((wl_registry*)waylandState.registry->resource(), id, &wl_compositor_interface, 6));
+        } else if (NAME == "zwp_linux_dmabuf_v1") {
+            backend->log(AQ_LOG_TRACE, std::format("  > binding to global: {} (version {}) with id {}", name, 5, id));
+            waylandState.dmabuf =
+                makeShared<CZwpLinuxDmabufV1>((wl_proxy*)wl_registry_bind((wl_registry*)waylandState.registry->resource(), id, &zwp_linux_dmabuf_v1_interface, 5));
+            if (!initDmabuf()) {
+                backend->log(AQ_LOG_ERROR, "Wayland backend cannot start: zwp_linux_dmabuf_v1 init failed");
+                waylandState.dmabufFailed = true;
+            }
         }
     });
     waylandState.registry->setGlobalRemove([this](CWlRegistry* r, uint32_t id) { ; });
 
     wl_display_roundtrip(waylandState.display);
 
-    if (!waylandState.xdg || !waylandState.compositor || !waylandState.seat) {
+    if (!waylandState.xdg || !waylandState.compositor || !waylandState.seat || !waylandState.dmabuf || waylandState.dmabufFailed) {
         backend->log(AQ_LOG_ERROR, "Wayland backend cannot start: Missing protocols");
         return false;
     }
@@ -66,8 +81,13 @@ bool Aquamarine::CWaylandBackend::start() {
     return true;
 }
 
+int Aquamarine::CWaylandBackend::drmFD() {
+    return drmState.fd;
+}
+
 void Aquamarine::CWaylandBackend::createOutput(const std::string& szName) {
-    outputs.emplace_back(SP<CWaylandOutput>(new CWaylandOutput(szName, self)));
+    auto o = outputs.emplace_back(SP<CWaylandOutput>(new CWaylandOutput(szName, self)));
+    backend->events.newOutput.emit(SP<IOutput>(o));
 }
 
 int Aquamarine::CWaylandBackend::pollFD() {
@@ -95,8 +115,7 @@ bool Aquamarine::CWaylandBackend::dispatchEvents() {
     return true;
 }
 
-Aquamarine::CWaylandKeyboard::CWaylandKeyboard(Hyprutils::Memory::CSharedPointer<CWlKeyboard> keyboard_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_) :
+Aquamarine::CWaylandKeyboard::CWaylandKeyboard(SP<CWlKeyboard> keyboard_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_) : keyboard(keyboard_), backend(backend_) {
-    keyboard(keyboard_), backend(backend_) {
     if (!keyboard->resource())
         return;
 
@@ -111,7 +130,7 @@ Aquamarine::CWaylandKeyboard::CWaylandKeyboard(Hyprutils::Memory::CSharedPointer
     });
 
     keyboard->setModifiers([this](CWlKeyboard* r, uint32_t serial, uint32_t depressed, uint32_t latched, uint32_t locked, uint32_t group) {
-        events.key.emit(SModifiersEvent{
+        events.modifiers.emit(SModifiersEvent{
             .depressed = depressed,
             .latched   = latched,
             .locked    = locked,
@@ -128,19 +147,21 @@ const std::string& Aquamarine::CWaylandKeyboard::getName() {
     return name;
 }
 
-Aquamarine::CWaylandPointer::CWaylandPointer(Hyprutils::Memory::CSharedPointer<CWlPointer> pointer_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_) :
+Aquamarine::CWaylandPointer::CWaylandPointer(SP<CWlPointer> pointer_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_) : pointer(pointer_), backend(backend_) {
-    pointer(pointer_), backend(backend_) {
     if (!pointer->resource())
         return;
 
     backend->backend->log(AQ_LOG_DEBUG, "New wayland pointer wl_pointer");
 
     pointer->setMotion([this](CWlPointer* r, uint32_t serial, wl_fixed_t x, wl_fixed_t y) {
-        if (!backend->focusedOutput || !backend->focusedOutput->state->mode)
+        if (!backend->focusedOutput || (!backend->focusedOutput->state->mode && !backend->focusedOutput->state->customMode.has_value()))
             return;
 
+        const Vector2D size =
+            backend->focusedOutput->state->customMode.has_value() ? backend->focusedOutput->state->customMode->pixelSize : backend->focusedOutput->state->mode->pixelSize;
+
         Vector2D local = {wl_fixed_to_double(x), wl_fixed_to_double(y)};
-        local          = local / backend->focusedOutput->state->mode->pixelSize;
+        local          = local / size;
 
         events.warp.emit(SWarpEvent{
             .absolute = local,
@@ -192,15 +213,17 @@ void Aquamarine::CWaylandBackend::initSeat() {
         const bool HAS_KEYBOARD = ((uint32_t)cap) & WL_SEAT_CAPABILITY_KEYBOARD;
         const bool HAS_POINTER  = ((uint32_t)cap) & WL_SEAT_CAPABILITY_POINTER;
 
-        if (HAS_KEYBOARD && keyboards.empty())
+        if (HAS_KEYBOARD && keyboards.empty()) {
-            keyboards.emplace_back(makeShared<CWaylandKeyboard>(SP<CWlKeyboard>(waylandState.seat->sendGetKeyboard()), self));
+            auto k = keyboards.emplace_back(makeShared<CWaylandKeyboard>(makeShared<CWlKeyboard>(waylandState.seat->sendGetKeyboard()), self));
-        else if (!HAS_KEYBOARD && !keyboards.empty())
+            backend->events.newKeyboard.emit(SP<IKeyboard>(k));
+        } else if (!HAS_KEYBOARD && !keyboards.empty())
             keyboards.clear();
 
-        if (HAS_POINTER && pointers.empty())
+        if (HAS_POINTER && pointers.empty()) {
-            keyboards.emplace_back(makeShared<CWaylandKeyboard>(SP<CWlKeyboard>(waylandState.seat->sendGetKeyboard()), self));
+            auto p = pointers.emplace_back(makeShared<CWaylandPointer>(makeShared<CWlPointer>(waylandState.seat->sendGetPointer()), self));
-        else if (!HAS_POINTER && !keyboards.empty())
+            backend->events.newPointer.emit(SP<IPointer>(p));
-            keyboards.clear();
+        } else if (!HAS_POINTER && !pointers.empty())
+            pointers.clear();
     });
 }
 
@@ -208,17 +231,82 @@ void Aquamarine::CWaylandBackend::initShell() {
     waylandState.xdg->setPing([](CXdgWmBase* r, uint32_t serial) { r->sendPong(serial); });
 }
 
+bool Aquamarine::CWaylandBackend::initDmabuf() {
+    waylandState.dmabufFeedback = makeShared<CZwpLinuxDmabufFeedbackV1>(waylandState.dmabuf->sendGetDefaultFeedback());
+    if (!waylandState.dmabufFeedback) {
+        backend->log(AQ_LOG_ERROR, "initDmabuf: failed to get default feedback");
+        return false;
+    }
+
+    waylandState.dmabufFeedback->setDone([this](CZwpLinuxDmabufFeedbackV1* r) {
+        // no-op
+        backend->log(AQ_LOG_DEBUG, "zwp_linux_dmabuf_v1: Got done");
+    });
+
+    waylandState.dmabufFeedback->setMainDevice([this](CZwpLinuxDmabufFeedbackV1* r, wl_array* deviceArr) {
+        backend->log(AQ_LOG_DEBUG, "zwp_linux_dmabuf_v1: Got main device");
+
+        dev_t device;
+        ASSERT(deviceArr->size == sizeof(device));
+        memcpy(&device, deviceArr->data, sizeof(device));
+
+        drmDevice* drmDev;
+        if (drmGetDeviceFromDevId(device, /* flags */ 0, &drmDev) != 0) {
+            backend->log(AQ_LOG_ERROR, "zwp_linux_dmabuf_v1: drmGetDeviceFromDevId failed");
+            return;
+        }
+
+        const char* name = nullptr;
+        if (drmDev->available_nodes & (1 << DRM_NODE_RENDER))
+            name = drmDev->nodes[DRM_NODE_RENDER];
+        else {
+            // Likely a split display/render setup. Pick the primary node and hope
+            // Mesa will open the right render node under-the-hood.
+            ASSERT(drmDev->available_nodes & (1 << DRM_NODE_PRIMARY));
+            name = drmDev->nodes[DRM_NODE_PRIMARY];
+            backend->log(AQ_LOG_WARNING, "zwp_linux_dmabuf_v1: DRM device has no render node, using primary.");
+        }
+
+        if (!name) {
+            backend->log(AQ_LOG_ERROR, "zwp_linux_dmabuf_v1: no node name");
+            return;
+        }
+
+        drmState.nodeName = name;
+
+        drmFreeDevice(&drmDev);
+
+        backend->log(AQ_LOG_DEBUG, std::format("zwp_linux_dmabuf_v1: Got node {}", drmState.nodeName));
+    });
+
+    // TODO: format table and tranche
+
+    wl_display_roundtrip(waylandState.display);
+
+    if (!drmState.nodeName.empty()) {
+        drmState.fd = open(drmState.nodeName.c_str(), O_RDWR | O_NONBLOCK | O_CLOEXEC);
+        if (drmState.fd < 0) {
+            backend->log(AQ_LOG_ERROR, std::format("zwp_linux_dmabuf_v1: Failed to open node {}", drmState.nodeName));
+            return false;
+        }
+
+        backend->log(AQ_LOG_DEBUG, std::format("zwp_linux_dmabuf_v1: opened node {} with fd {}", drmState.nodeName, drmState.fd));
+    }
+
+    return true;
+}
+
 Aquamarine::CWaylandOutput::CWaylandOutput(const std::string& name_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_) : name(name_), backend(backend_) {
     errno = 0;
 
-    waylandState.surface = SP<CWlSurface>(backend->waylandState.compositor->sendCreateSurface());
+    waylandState.surface = makeShared<CWlSurface>(backend->waylandState.compositor->sendCreateSurface());
 
     if (!waylandState.surface->resource()) {
         backend->backend->log(AQ_LOG_ERROR, std::format("Output {} failed: no surface given. Errno: {}", name, errno));
         return;
     }
 
-    waylandState.xdgSurface = SP<CXdgSurface>(backend->waylandState.xdg->sendGetXdgSurface(waylandState.surface->resource()));
+    waylandState.xdgSurface = makeShared<CXdgSurface>(backend->waylandState.xdg->sendGetXdgSurface(waylandState.surface->resource()));
 
     if (!waylandState.xdgSurface->resource()) {
         backend->backend->log(AQ_LOG_ERROR, std::format("Output {} failed: no xdgSurface given. Errno: {}", name, errno));
@@ -230,7 +318,7 @@ Aquamarine::CWaylandOutput::CWaylandOutput(const std::string& name_, Hyprutils::
         r->sendAckConfigure(serial);
     });
 
-    waylandState.xdgToplevel = SP<CXdgToplevel>(waylandState.xdgSurface->sendGetToplevel());
+    waylandState.xdgToplevel = makeShared<CXdgToplevel>(waylandState.xdgSurface->sendGetToplevel());
 
     if (!waylandState.xdgToplevel->resource()) {
         backend->backend->log(AQ_LOG_ERROR, std::format("Output {} failed: no xdgToplevel given. Errno: {}", name, errno));
@@ -241,13 +329,29 @@ Aquamarine::CWaylandOutput::CWaylandOutput(const std::string& name_, Hyprutils::
         [this](CXdgToplevel* r, wl_array* arr) { backend->backend->log(AQ_LOG_DEBUG, std::format("Output {}: wm_capabilities received", name)); });
 
     waylandState.xdgToplevel->setConfigure([this](CXdgToplevel* r, int32_t w, int32_t h, wl_array* arr) {
+        // we only create the swapchain here because in the main func we still don't have an allocator
+        if (!swapchain) {
+            swapchain = makeShared<CSwapchain>(backend->backend->allocator);
+            if (!swapchain) {
+                backend->backend->log(AQ_LOG_ERROR, std::format("Output {} failed: swapchain creation failed", name));
+                return;
+            }
+        }
+
         backend->backend->log(AQ_LOG_DEBUG, std::format("Output {}: configure toplevel with {}x{}", name, w, h));
         events.state.emit(SStateEvent{.size = {w, h}});
+        sendFrameAndSetCallback();
     });
 
+    auto inputRegion = makeShared<CWlRegion>(backend->waylandState.compositor->sendCreateRegion());
+    inputRegion->sendAdd(0, 0, INT32_MAX, INT32_MAX);
+
+    waylandState.surface->sendSetInputRegion(inputRegion.get());
     waylandState.surface->sendAttach(nullptr, 0, 0);
     waylandState.surface->sendCommit();
 
+    inputRegion->sendDestroy();
+
     backend->backend->log(AQ_LOG_DEBUG, std::format("Output {}: initialized", name));
 }
 
@@ -260,6 +364,114 @@ Aquamarine::CWaylandOutput::~CWaylandOutput() {
         waylandState.surface->sendDestroy();
 }
 
-void Aquamarine::CWaylandOutput::commit() {
+bool Aquamarine::CWaylandOutput::commit() {
-    ;
+    Vector2D pixelSize   = {};
+    uint32_t refreshRate = 0;
+
+    if (state->customMode)
+        pixelSize = state->customMode->pixelSize;
+    else if (state->mode)
+        pixelSize = state->mode->pixelSize;
+    else {
+        backend->backend->log(AQ_LOG_ERROR, std::format("Output {}: pending state rejected: invalid mode", name));
+        return false;
+    }
+
+    uint32_t format = state->drmFormat;
+
+    if (format == DRM_FORMAT_INVALID) {
+        backend->backend->log(AQ_LOG_ERROR, std::format("Output {}: pending state rejected: invalid format", name));
+        return false;
+    }
+
+    if (!swapchain->reconfigure(SSwapchainOptions{.length = 2, .size = pixelSize, .format = format})) {
+        backend->backend->log(AQ_LOG_ERROR, std::format("Output {}: pending state rejected: swapchain failed reconfiguring", name));
+        return false;
+    }
+
+    if (!state->buffer) {
+        backend->backend->log(AQ_LOG_ERROR, std::format("Output {}: pending state rejected: no buffer", name));
+        return false;
+    }
+
+    auto wlBuffer = wlBufferFromBuffer(state->buffer);
+
+    if (!wlBuffer) {
+        backend->backend->log(AQ_LOG_ERROR, std::format("Output {}: pending state rejected: no wlBuffer??", name));
+        return false;
+    }
+
+    if (wlBuffer->pendingRelease)
+        backend->backend->log(AQ_LOG_WARNING, std::format("Output {}: pending state has a non-released buffer??", name));
+
+    wlBuffer->pendingRelease = true;
+
+    waylandState.surface->sendAttach(wlBuffer->waylandState.buffer.get(), 0, 0);
+    waylandState.surface->sendDamageBuffer(0, 0, INT32_MAX, INT32_MAX);
+    waylandState.surface->sendCommit();
+
+    return true;
+}
+
+SP<CWaylandBuffer> Aquamarine::CWaylandOutput::wlBufferFromBuffer(SP<IBuffer> buffer) {
+    std::erase_if(backendState.buffers, [this](const auto& el) { return el.first.expired() || !swapchain->contains(el.first.lock()); });
+
+    for (auto& [k, v] : backendState.buffers) {
+        if (k != buffer)
+            continue;
+
+        return v;
+    }
+
+    // create a new one
+    auto wlBuffer = makeShared<CWaylandBuffer>(buffer, backend);
+
+    if (!wlBuffer->good())
+        return nullptr;
+
+    backendState.buffers.emplace_back(std::make_pair<>(buffer, wlBuffer));
+
+    return wlBuffer;
+}
+
+void Aquamarine::CWaylandOutput::sendFrameAndSetCallback() {
+    events.frame.emit();
+    if (waylandState.frameCallback)
+        return;
+
+    waylandState.frameCallback = makeShared<CWlCallback>(waylandState.surface->sendFrame());
+    waylandState.frameCallback->setDone([this](CWlCallback* r, uint32_t ms) {
+        events.frame.emit();
+        waylandState.frameCallback.reset();
+    });
+}
+
+Aquamarine::CWaylandBuffer::CWaylandBuffer(SP<IBuffer> buffer_, Hyprutils::Memory::CWeakPointer<CWaylandBackend> backend_) : buffer(buffer_), backend(backend_) {
+    auto params = makeShared<CZwpLinuxBufferParamsV1>(backend->waylandState.dmabuf->sendCreateParams());
+
+    if (!params) {
+        backend->backend->log(AQ_LOG_ERROR, "WaylandBuffer: failed to query params");
+        return;
+    }
+
+    auto attrs = buffer->dmabuf();
+
+    for (size_t i = 0; i < attrs.planes; ++i) {
+        params->sendAdd(attrs.fds.at(i), i, attrs.offsets.at(i), attrs.strides.at(i), attrs.modifier >> 32, attrs.modifier & 0xFFFFFFFF);
+    }
+
+    waylandState.buffer = makeShared<CWlBuffer>(params->sendCreateImmed(attrs.size.x, attrs.size.y, attrs.format, (zwpLinuxBufferParamsV1Flags)0));
+
+    waylandState.buffer->setRelease([this](CWlBuffer* r) { pendingRelease = false; });
+
+    params->sendDestroy();
+}
+
+Aquamarine::CWaylandBuffer::~CWaylandBuffer() {
+    if (waylandState.buffer && waylandState.buffer->resource())
+        waylandState.buffer->sendDestroy();
+}
+
+bool Aquamarine::CWaylandBuffer::good() {
+    return waylandState.buffer && waylandState.buffer->resource();
 }

src/include/FormatUtils.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <string>
+#include <cstdint>
+
+std::string fourccToName(uint32_t drmFormat);

src/utils/FormatUtils.cpp

@@ -0,0 +1,8 @@
+#include "FormatUtils.hpp"
+#include <drm_fourcc.h>
+#include <xf86drm.h>
+
+std::string fourccToName(uint32_t drmFormat) {
+    auto fmt = drmGetFormatName(drmFormat);
+    return fmt ? fmt : "unknown";
+}

tests/SimpleWindow.cpp

@@ -1,6 +1,12 @@
 #include <aquamarine/backend/Backend.hpp>
+#include <aquamarine/output/Output.hpp>
+#include <aquamarine/input/Input.hpp>
 #include <iostream>
 
+using namespace Hyprutils::Signal;
+using namespace Hyprutils::Memory;
+#define SP CSharedPointer
+
 static const char* aqLevelToString(Aquamarine::eBackendLogLevel level) {
     switch (level) {
         case Aquamarine::eBackendLogLevel::AQ_LOG_TRACE: return "TRACE";
@@ -18,6 +24,29 @@ void aqLog(Aquamarine::eBackendLogLevel level, std::string msg) {
     std::cout << "[AQ] [" << aqLevelToString(level) << "] " << msg << "\n";
 }
 
+CHyprSignalListener     newOutputListener, outputFrameListener, outputStateListener, mouseMotionListener, keyboardKeyListener, newMouseListener, newKeyboardListener;
+SP<Aquamarine::IOutput> output;
+
+//
+void onFrame() {
+    std::cout << "[Client] onFrame\n";
+
+    auto buf = output->swapchain->next(nullptr);
+
+    output->state->buffer = buf;
+    output->commit();
+}
+
+void onState(const Aquamarine::IOutput::SStateEvent& event) {
+    std::cout << "[Client] onState with size " << std::format("{}", event.size) << "\n";
+
+    output->state->enabled = true;
+    output->state->customMode = {.pixelSize = event.size};
+    output->state->drmFormat = DRM_FORMAT_XRGB8888;
+
+    output->commit();
+}
+
 int main(int argc, char** argv, char** envp) {
     Aquamarine::SBackendOptions options;
     options.logFunction = aqLog;
@@ -30,7 +59,32 @@ int main(int argc, char** argv, char** envp) {
 
     auto aqBackend = Aquamarine::CBackend::create(implementations, options);
 
-    if (!aqBackend->start()) {
+    newOutputListener = aqBackend->events.newOutput.registerListener([](std::any data) {
+        output = std::any_cast<SP<Aquamarine::IOutput>>(data);
+
+        std::cout << "[Client] Got a new output named " << output->name << "\n";
+
+        outputFrameListener = output->events.frame.registerListener([](std::any data) { onFrame(); });
+        outputStateListener = output->events.state.registerListener([](std::any data) { onState(std::any_cast<Aquamarine::IOutput::SStateEvent>(data)); });
+    });
+
+    newMouseListener = aqBackend->events.newPointer.registerListener([] (std::any pointer) {
+        auto p = std::any_cast<SP<Aquamarine::IPointer>>(pointer);
+        mouseMotionListener = p->events.warp.registerListener([] (std::any data) {
+            auto e = std::any_cast<Aquamarine::IPointer::SWarpEvent>(data);
+            std::cout << "[Client] Mouse warped to " << std::format("{}", e.absolute) << "\n";
+        });
+    });
+
+    newKeyboardListener = aqBackend->events.newKeyboard.registerListener([] (std::any keeb) {
+        auto k = std::any_cast<SP<Aquamarine::IKeyboard>>(keeb);
+        keyboardKeyListener = k->events.key.registerListener([] (std::any data) {
+            auto e = std::any_cast<Aquamarine::IKeyboard::SKeyEvent>(data);
+            std::cout << "[Client] Key " << std::format("{}", e.key) << " state: " << e.pressed << " \n";
+        });
+    });
+
+    if (!aqBackend || !aqBackend->start()) {
         std::cout << "Failed to start the aq backend\n";
         return 1;
     }