backends/drm,wayland: require gbm

The ifdefs for have_gbm obfuscate the code unnecessarily - the drm backend
is not a great experience with qpainter, so in practice noone should ship
it without gbm anyways.

CMakeLists.txt

@@ -222,8 +222,7 @@ find_package(Libdrm 2.4.62)
 set_package_properties(Libdrm PROPERTIES TYPE REQUIRED PURPOSE "Required for drm output on Wayland.")
 
 find_package(gbm)
-set_package_properties(gbm PROPERTIES TYPE OPTIONAL PURPOSE "Required for egl output of drm backend.")
-set(HAVE_GBM ${gbm_FOUND})
+set_package_properties(gbm PROPERTIES TYPE REQUIRED PURPOSE "Required for egl output of drm backend.")
 if (${gbm_VERSION} GREATER_EQUAL 21.1)
     set(HAVE_GBM_BO_GET_FD_FOR_PLANE 1)
 else()

src/backends/drm/CMakeLists.txt

@@ -19,24 +19,15 @@ set(DRM_SOURCES
     drm_abstract_output.cpp
     drm_virtual_output.cpp
     drm_lease_output.cpp
+    egl_gbm_backend.cpp
+    drm_buffer_gbm.cpp
+    gbm_surface.cpp
+    gbm_dmabuf.cpp
 )
 
-if (HAVE_GBM)
-    set(DRM_SOURCES ${DRM_SOURCES}
-        egl_gbm_backend.cpp
-        drm_buffer_gbm.cpp
-        gbm_surface.cpp
-        gbm_dmabuf.cpp
-    )
-endif()
-
 add_library(KWinWaylandDrmBackend MODULE ${DRM_SOURCES})
 set_target_properties(KWinWaylandDrmBackend PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/org.kde.kwin.waylandbackends/")
-target_link_libraries(KWinWaylandDrmBackend kwin Libdrm::Libdrm)
-
-if (HAVE_GBM)
-    target_link_libraries(KWinWaylandDrmBackend gbm::gbm)
-endif()
+target_link_libraries(KWinWaylandDrmBackend kwin Libdrm::Libdrm gbm::gbm)
 
 install(
     TARGETS

src/backends/drm/drm_backend.cpp

@@ -27,11 +27,8 @@
 #include "drm_pipeline.h"
 #include "drm_virtual_output.h"
 #include "waylandoutputconfig.h"
-#if HAVE_GBM
 #include "egl_gbm_backend.h"
-#include <gbm.h>
 #include "gbm_dmabuf.h"
-#endif
 // KF5
 #include <KCoreAddons>
 #include <KLocalizedString>
@@ -48,6 +45,7 @@
 #include <unistd.h>
 #include <cerrno>
 // drm
+#include <gbm.h>
 #include <xf86drm.h>
 #include <libdrm/drm_mode.h>
 
@@ -588,7 +586,6 @@ QPainterBackend *DrmBackend::createQPainterBackend()
 
 OpenGLBackend *DrmBackend::createOpenGLBackend()
 {
-#if HAVE_GBM
     auto primaryBackend = new EglGbmBackend(this, m_gpus.at(0));
     AbstractEglBackend::setPrimaryBackend(primaryBackend);
     EglMultiBackend *backend = new EglMultiBackend(this, primaryBackend);
@@ -596,9 +593,6 @@ OpenGLBackend *DrmBackend::createOpenGLBackend()
         backend->addGpu(m_gpus[i]);
     }
     return backend;
-#else
-    return Platform::createOpenGLBackend();
-#endif
 }
 
 void DrmBackend::sceneInitialized()
@@ -611,11 +605,7 @@ QVector<CompositingType> DrmBackend::supportedCompositors() const
     if (selectedCompositor() != NoCompositing) {
         return {selectedCompositor()};
     }
-#if HAVE_GBM
     return QVector<CompositingType>{OpenGLCompositing, QPainterCompositing};
-#else
-    return QVector<CompositingType>{QPainterCompositing};
-#endif
 }
 
 QString DrmBackend::supportInformation() const
@@ -650,13 +640,12 @@ void DrmBackend::removeVirtualOutput(AbstractOutput *output)
 
 DmaBufTexture *DrmBackend::createDmaBufTexture(const QSize &size)
 {
-#if HAVE_GBM
     if (primaryGpu()->eglBackend() && primaryGpu()->gbmDevice()) {
         primaryGpu()->eglBackend()->makeCurrent();
         return GbmDmaBuf::createBuffer(size, primaryGpu()->gbmDevice());
+    } else {
+        return nullptr;
     }
-#endif
-    return nullptr;
 }
 
 DrmGpu *DrmBackend::primaryGpu() const

src/backends/drm/drm_gpu.cpp

@@ -22,12 +22,8 @@
 #include "drm_virtual_output.h"
 #include "wayland_server.h"
 #include "drm_lease_output.h"
-
-#if HAVE_GBM
 #include "egl_gbm_backend.h"
-#include <gbm.h>
 #include "gbm_dmabuf.h"
-#endif
 // system
 #include <algorithm>
 #include <errno.h>
@@ -35,6 +31,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 // drm
+#include <gbm.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 #include <libdrm/drm_mode.h>
@@ -80,9 +77,7 @@ DrmGpu::DrmGpu(DrmBackend *backend, const QString &devNode, int fd, dev_t device
     // find out if this GPU is using the NVidia proprietary driver
     DrmScopedPointer<drmVersion> version(drmGetVersion(fd));
     m_isNVidia = strstr(version->name, "nvidia-drm");
-#if HAVE_GBM
     m_gbmDevice = gbm_create_device(m_fd);
-#endif
 
     m_socketNotifier = new QSocketNotifier(fd, QSocketNotifier::Read, this);
     connect(m_socketNotifier, &QSocketNotifier::activated, this, &DrmGpu::dispatchEvents);
@@ -142,11 +137,9 @@ DrmGpu::~DrmGpu()
     qDeleteAll(m_connectors);
     qDeleteAll(m_planes);
     delete m_socketNotifier;
-#if HAVE_GBM
     if (m_gbmDevice) {
         gbm_device_destroy(m_gbmDevice);
     }
-#endif
     m_platform->session()->closeRestricted(m_fd);
 }
 

src/backends/drm/drm_pipeline.cpp

@@ -21,14 +21,10 @@
 #include "session.h"
 #include "drm_output.h"
 #include "drm_backend.h"
-
-#if HAVE_GBM
-#include <gbm.h>
-
 #include "egl_gbm_backend.h"
 #include "drm_buffer_gbm.h"
-#endif
 
+#include <gbm.h>
 #include <drm_fourcc.h>
 
 namespace KWin
@@ -62,13 +58,9 @@ bool DrmPipeline::present(const QSharedPointer<DrmBuffer> &buffer)
         return false;
     }
     m_primaryBuffer = buffer;
-    bool directScanout = false;
-#if HAVE_GBM
+    auto buf = dynamic_cast<DrmGbmBuffer*>(buffer.data());
     // with direct scanout disallow modesets, calling presentFailed() and logging warnings
-    if (auto buf = dynamic_cast<DrmGbmBuffer*>(buffer.data()); buf && buf->clientBuffer()) {
-        directScanout = true;
-    }
-#endif
+    bool directScanout = buf && buf->clientBuffer();
     if (gpu()->needsModeset()) {
         if (directScanout) {
             return false;
@@ -302,19 +294,18 @@ bool DrmPipeline::checkTestBuffer()
         checkBuffer(pending.crtc->current());
     }
     // if we don't have a fitting buffer already, get or create one
-    if (buffer) {
-#if HAVE_GBM
-    } else if (backend && m_output) {
-        buffer = backend->renderTestFrame(m_output);
-    } else if (backend && gpu()->gbmDevice()) {
-        gbm_bo *bo = gbm_bo_create(gpu()->gbmDevice(), sourceSize().width(), sourceSize().height(), GBM_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
-        if (!bo) {
-            return false;
+    if (!buffer) {
+        if (backend && m_output) {
+            buffer = backend->renderTestFrame(m_output);
+        } else if (backend && gpu()->gbmDevice()) {
+            gbm_bo *bo = gbm_bo_create(gpu()->gbmDevice(), sourceSize().width(), sourceSize().height(), GBM_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
+            if (!bo) {
+                return false;
+            }
+            buffer = QSharedPointer<DrmGbmBuffer>::create(gpu(), bo, nullptr);
+        } else {
+            buffer = QSharedPointer<DrmDumbBuffer>::create(gpu(), sourceSize());
         }
-        buffer = QSharedPointer<DrmGbmBuffer>::create(gpu(), bo, nullptr);
-#endif
-    } else {
-        buffer = QSharedPointer<DrmDumbBuffer>::create(gpu(), sourceSize());
     }
     if (buffer && buffer->bufferId()) {
         m_oldTestBuffer = m_primaryBuffer;

src/backends/drm/egl_multi_backend.cpp

@@ -10,9 +10,7 @@
 #include "egl_multi_backend.h"
 #include <config-kwin.h>
 #include "logging.h"
-#if HAVE_GBM
 #include "egl_gbm_backend.h"
-#endif
 #include "drm_backend.h"
 #include "drm_gpu.h"
 
@@ -112,13 +110,11 @@ bool EglMultiBackend::directScanoutAllowed(AbstractOutput *output) const
 
 void EglMultiBackend::addGpu(DrmGpu *gpu)
 {
-#if HAVE_GBM
     AbstractEglDrmBackend *backend= new EglGbmBackend(m_platform, gpu);
     if (m_initialized) {
         backend->init();
     }
     m_backends.append(backend);
-#endif
 }
 
 void EglMultiBackend::removeGpu(DrmGpu *gpu)

src/backends/wayland/CMakeLists.txt

@@ -6,10 +6,7 @@ set(WAYLAND_BACKEND_SOURCES
 )
 
 if (HAVE_WAYLAND_EGL)
-    set(WAYLAND_BACKEND_SOURCES egl_wayland_backend.cpp ${WAYLAND_BACKEND_SOURCES})
-    if (HAVE_GBM)
-        list(APPEND WAYLAND_BACKEND_SOURCES ../drm/gbm_dmabuf.cpp)
-    endif()
+    set(WAYLAND_BACKEND_SOURCES egl_wayland_backend.cpp ${WAYLAND_BACKEND_SOURCES} ../drm/gbm_dmabuf.cpp)
 endif()
 
 add_library(KWinWaylandWaylandBackend MODULE ${WAYLAND_BACKEND_SOURCES})
@@ -17,10 +14,7 @@ set_target_properties(KWinWaylandWaylandBackend PROPERTIES LIBRARY_OUTPUT_DIRECT
 target_link_libraries(KWinWaylandWaylandBackend kwin KF5::WaylandClient)
 
 if (HAVE_WAYLAND_EGL)
-    target_link_libraries(KWinWaylandWaylandBackend Wayland::Egl)
-    if (HAVE_GBM)
-       target_link_libraries(KWinWaylandWaylandBackend gbm::gbm)
-    endif()
+    target_link_libraries(KWinWaylandWaylandBackend Wayland::Egl gbm::gbm)
 endif()
 
 install(

src/backends/wayland/wayland_backend.cpp

@@ -12,11 +12,9 @@
 
 #if HAVE_WAYLAND_EGL
 #include "egl_wayland_backend.h"
-#if HAVE_GBM
 #include "../drm/gbm_dmabuf.h"
 #include <gbm.h>
 #endif
-#endif
 #include "logging.h"
 #include "renderloop_p.h"
 #include "scene_qpainter_wayland_backend.h"
@@ -586,7 +584,7 @@ WaylandBackend::WaylandBackend(QObject *parent)
     connect(this, &WaylandBackend::connectionFailed, qApp, &QCoreApplication::quit);
 
 
-#if HAVE_GBM && HAVE_WAYLAND_EGL
+#if HAVE_WAYLAND_EGL
     char const *drm_render_node = "/dev/dri/renderD128";
     m_drmFileDescriptor = open(drm_render_node, O_RDWR);
     if (m_drmFileDescriptor < 0) {
@@ -627,7 +625,7 @@ WaylandBackend::~WaylandBackend()
     m_connectionThread->quit();
     m_connectionThread->wait();
     m_connectionThreadObject->deleteLater();
-#if HAVE_GBM && HAVE_WAYLAND_EGL
+#if HAVE_WAYLAND_EGL
     gbm_device_destroy(m_gbmDevice);
     close(m_drmFileDescriptor);
 #endif
@@ -1016,7 +1014,7 @@ void WaylandBackend::addConfiguredOutput(WaylandOutput *output)
 
 DmaBufTexture *WaylandBackend::createDmaBufTexture(const QSize& size)
 {
-#if HAVE_GBM && HAVE_WAYLAND_EGL
+#if HAVE_WAYLAND_EGL
     return GbmDmaBuf::createBuffer(size, m_gbmDevice);
 #else
     return nullptr;

src/backends/wayland/wayland_backend.h

@@ -322,7 +322,7 @@ private:
     KWayland::Client::ServerSideDecorationManager *m_ssdManager = nullptr;
     KWayland::Client::ServerSideDecorationManager *ssdManager();
     int m_nextId = 0;
-#if HAVE_GBM && HAVE_WAYLAND_EGL
+#if HAVE_WAYLAND_EGL
     int m_drmFileDescriptor = 0;
     gbm_device *m_gbmDevice;
 #endif

src/config-kwin.h.cmake

@@ -14,7 +14,6 @@
 #define KWIN_XCLIPBOARD_SYNC_BIN "${CMAKE_INSTALL_FULL_LIBEXECDIR}/org_kde_kwin_xclipboard_syncer"
 #cmakedefine01 HAVE_X11_XCB
 #cmakedefine01 HAVE_X11_XINPUT
-#cmakedefine01 HAVE_GBM
 #cmakedefine01 HAVE_GBM_BO_GET_FD_FOR_PLANE
 #cmakedefine01 HAVE_WAYLAND_EGL
 #cmakedefine01 HAVE_SYS_PRCTL_H

src/workspace.cpp

@@ -1496,12 +1496,6 @@ QString Workspace::supportInformation() const
     support.append(yes);
 #else
     support.append(no);
-#endif
-    support.append(QStringLiteral("HAVE_GBM: "));
-#if HAVE_GBM
-    support.append(yes);
-#else
-    support.append(no);
 #endif
     support.append(QStringLiteral("HAVE_X11_XCB: "));
 #if HAVE_X11_XCB