kms: Support QOpenGLWidget and QQuickWidget

Also fixes the handling of shareContext() for contexts and format() for windows
and makes QOffscreenSurface working.

Change-Id: I3c3374a9de14a5b8428de3e11d9d7e1285c5b9c7
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

src/plugins/platforms/kms/qkmsbackingstore.cpp

@@ -49,7 +49,6 @@ QKmsBackingStore::QKmsBackingStore(QWindow *window)
     m_context->setFormat(window->requestedFormat());
     m_context->setScreen(window->screen());
     m_context->create();
-    window->setSurfaceType(QSurface::OpenGLSurface);
 }
 
 QKmsBackingStore::~QKmsBackingStore()

src/plugins/platforms/kms/qkmsbackingstore.h

@@ -56,6 +56,8 @@ public:
     void flush(QWindow *window, const QRegion &region, const QPoint &offset);
     void resize(const QSize &size, const QRegion &staticContents);
 
+    QImage toImage() const Q_DECL_OVERRIDE { return m_image; }
+
 private:
     QOpenGLContext *m_context;
     QImage m_image;

src/plugins/platforms/kms/qkmscontext.cpp

@@ -35,19 +35,18 @@
 #include "qkmsdevice.h"
 #include "qkmscontext.h"
 #include "qkmswindow.h"
+#include "qkmsintegration.h"
 
-#include <QOpenGLContext>
-
+#include <QtGui/QOpenGLContext>
 #include <QtPlatformSupport/private/qeglconvenience_p.h>
 
 QT_BEGIN_NAMESPACE
 
 QKmsContext::QKmsContext(QOpenGLContext *context, QKmsDevice *device)
-    : QPlatformOpenGLContext()
-    , m_device(device)
+    : m_device(device)
 {
     EGLDisplay display = m_device->eglDisplay();
-    EGLConfig config = q_configFromGLFormat(display, QKmsScreen::tweakFormat(context->format()), true);
+    EGLConfig config = q_configFromGLFormat(display, QKmsScreen::tweakFormat(context->format()));
     m_format = q_glFormatFromConfig(display, config);
 
     //Initialize EGLContext
@@ -57,7 +56,12 @@ QKmsContext::QKmsContext(QOpenGLContext *context, QKmsDevice *device)
     };
 
     eglBindAPI(EGL_OPENGL_ES_API);
-    m_eglContext = eglCreateContext(display, config, 0, contextAttribs);
+
+    EGLContext share = EGL_NO_CONTEXT;
+    if (context->shareContext())
+        share = static_cast<QKmsContext *>(context->shareContext()->handle())->eglContext();
+
+    m_eglContext = eglCreateContext(display, config, share, contextAttribs);
     if (m_eglContext == EGL_NO_CONTEXT) {
         qWarning("QKmsContext::QKmsContext(): eglError: %x, this: %p",
                  eglGetError(), this);
@@ -72,16 +76,19 @@ bool QKmsContext::isValid() const
 
 bool QKmsContext::makeCurrent(QPlatformSurface *surface)
 {
-    Q_ASSERT(surface->surface()->surfaceType() == QSurface::OpenGLSurface);
+    Q_ASSERT(surface->surface()->supportsOpenGL());
 
     EGLDisplay display = m_device->eglDisplay();
+    EGLSurface eglSurface;
 
+    if (surface->surface()->surfaceClass() == QSurface::Window) {
         QPlatformWindow *window = static_cast<QPlatformWindow *>(surface);
-    QKmsScreen *screen = static_cast<QKmsScreen *> (QPlatformScreen::platformScreenForWindow(window->window()));
-
-    EGLSurface eglSurface = screen->eglSurface();
-
+        QKmsScreen *screen = static_cast<QKmsScreen *>(QPlatformScreen::platformScreenForWindow(window->window()));
+        eglSurface = screen->eglSurface();
         screen->waitForPageFlipComplete();
+    } else {
+        eglSurface = static_cast<QKmsOffscreenWindow *>(surface)->surface();
+    }
 
     bool ok = eglMakeCurrent(display, eglSurface, eglSurface, m_eglContext);
     if (!ok)

src/plugins/platforms/kms/qkmsintegration.cpp

@@ -48,10 +48,13 @@
 #include <QtPlatformSupport/private/qgenericunixeventdispatcher_p.h>
 #include <QtPlatformSupport/private/qgenericunixfontdatabase_p.h>
 #include <QtPlatformSupport/private/qfbvthandler_p.h>
+#include <QtPlatformSupport/private/qeglconvenience_p.h>
 
 #include <QtGui/private/qguiapplication_p.h>
 #include <QtGui/QOpenGLContext>
 #include <QtGui/QScreen>
+#include <QtGui/QOffscreenSurface>
+#include <qpa/qplatformoffscreensurface.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -116,6 +119,7 @@ bool QKmsIntegration::hasCapability(QPlatformIntegration::Capability cap) const
     case ThreadedPixmaps: return true;
     case OpenGL: return true;
     case ThreadedOpenGL: return false;
+    case RasterGLSurface: return true;
     default: return QPlatformIntegration::hasCapability(cap);
     }
 }
@@ -138,6 +142,44 @@ QPlatformBackingStore *QKmsIntegration::createPlatformBackingStore(QWindow *wind
     return new QKmsBackingStore(window);
 }
 
+// Neither a pbuffer nor a hidden QWindow is suitable. Just use an additional, small gbm surface.
+QKmsOffscreenWindow::QKmsOffscreenWindow(EGLDisplay display, const QSurfaceFormat &format, QOffscreenSurface *offscreenSurface)
+    : QPlatformOffscreenSurface(offscreenSurface)
+    , m_format(format)
+    , m_display(display)
+    , m_surface(EGL_NO_SURFACE)
+    , m_window(0)
+{
+    QKmsScreen *screen = static_cast<QKmsScreen *>(offscreenSurface->screen()->handle());
+    m_window = gbm_surface_create(screen->device()->gbmDevice(),
+                                  10, 10,
+                                  GBM_FORMAT_XRGB8888,
+                                  GBM_BO_USE_RENDERING);
+    if (!m_window) {
+        qWarning("QKmsOffscreenWindow: Failed to create native window");
+        return;
+    }
+
+    EGLConfig config = q_configFromGLFormat(m_display, m_format);
+    m_surface = eglCreateWindowSurface(m_display, config, m_window, 0);
+    if (m_surface != EGL_NO_SURFACE)
+        m_format = q_glFormatFromConfig(m_display, config);
+}
+
+QKmsOffscreenWindow::~QKmsOffscreenWindow()
+{
+    if (m_surface != EGL_NO_SURFACE)
+        eglDestroySurface(m_display, m_surface);
+    if (m_window)
+        gbm_surface_destroy((gbm_surface *) m_window);
+}
+
+QPlatformOffscreenSurface *QKmsIntegration::createPlatformOffscreenSurface(QOffscreenSurface *surface) const
+{
+    QKmsScreen *screen = static_cast<QKmsScreen *>(surface->screen()->handle());
+    return new QKmsOffscreenWindow(screen->device()->eglDisplay(), QKmsScreen::tweakFormat(surface->format()), surface);
+}
+
 QPlatformFontDatabase *QKmsIntegration::fontDatabase() const
 {
     return m_fontDatabase;

src/plugins/platforms/kms/qkmsintegration.h

@@ -36,7 +36,9 @@
 
 #include <qpa/qplatformintegration.h>
 #include <qpa/qplatformnativeinterface.h>
+#include <qpa/qplatformoffscreensurface.h>
 #include <QtPlatformSupport/private/qdevicediscovery_p.h>
+#include <EGL/egl.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -44,6 +46,24 @@ class QKmsScreen;
 class QKmsDevice;
 class QFbVtHandler;
 
+class QKmsOffscreenWindow : public QPlatformOffscreenSurface
+{
+public:
+    QKmsOffscreenWindow(EGLDisplay display, const QSurfaceFormat &format, QOffscreenSurface *offscreenSurface);
+    ~QKmsOffscreenWindow();
+
+    QSurfaceFormat format() const Q_DECL_OVERRIDE { return m_format; }
+    bool isValid() const Q_DECL_OVERRIDE { return m_surface != EGL_NO_SURFACE; }
+
+    EGLSurface surface() const { return m_surface; }
+
+private:
+    QSurfaceFormat m_format;
+    EGLDisplay m_display;
+    EGLSurface m_surface;
+    EGLNativeWindowType m_window;
+};
+
 class QKmsIntegration : public QObject, public QPlatformIntegration
 {
     Q_OBJECT
@@ -58,6 +78,7 @@ public:
     QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const Q_DECL_OVERRIDE;
     QPlatformWindow *createPlatformWindow(QWindow *window) const Q_DECL_OVERRIDE;
     QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const Q_DECL_OVERRIDE;
+    QPlatformOffscreenSurface *createPlatformOffscreenSurface(QOffscreenSurface *surface) const Q_DECL_OVERRIDE;
 
     QPlatformFontDatabase *fontDatabase() const Q_DECL_OVERRIDE;
     QAbstractEventDispatcher *createEventDispatcher() const Q_DECL_OVERRIDE;

src/plugins/platforms/kms/qkmsscreen.cpp

@@ -170,10 +170,11 @@ QSurfaceFormat QKmsScreen::tweakFormat(const QSurfaceFormat &format)
 void QKmsScreen::initializeWithFormat(const QSurfaceFormat &format)
 {
     EGLDisplay display = m_device->eglDisplay();
-    EGLConfig config = q_configFromGLFormat(display, tweakFormat(format), true);
+    EGLConfig config = q_configFromGLFormat(display, tweakFormat(format));
 
     m_eglWindowSurface = eglCreateWindowSurface(display, config, (EGLNativeWindowType)m_gbmSurface, NULL);
     qCDebug(lcQpaScreen) << "created window surface";
+    m_surfaceFormat = q_glFormatFromConfig(display, config);
 }
 
 void QKmsScreen::swapBuffers()

src/plugins/platforms/kms/qkmsscreen.h

@@ -48,6 +48,7 @@ extern "C" {
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 #include <QtGui/qopengl.h>
+#include <QtGui/qsurfaceformat.h>
 #include <QtCore/qloggingcategory.h>
 
 #include <qpa/qplatformscreen.h>
@@ -87,6 +88,8 @@ public:
 
     static QSurfaceFormat tweakFormat(const QSurfaceFormat &format);
 
+    QSurfaceFormat surfaceFormat() const { return m_surfaceFormat; }
+
 private:
     void performPageFlip();
     void initializeScreenMode(const drmModeRes *resources, const drmModeConnector *connector);
@@ -111,6 +114,7 @@ private:
     EGLSurface m_eglWindowSurface;
 
     bool m_modeSet;
+    QSurfaceFormat m_surfaceFormat;
 };
 
 QT_END_NAMESPACE

src/plugins/platforms/kms/qkmswindow.cpp

@@ -58,4 +58,9 @@ void QKmsWindow::setGeometry(const QRect &rect)
     QPlatformWindow::setGeometry(fullscreenRect);
 }
 
+QSurfaceFormat QKmsWindow::format() const
+{
+    return static_cast<QKmsScreen *>(m_screen)->surfaceFormat();
+}
+
 QT_END_NAMESPACE

src/plugins/platforms/kms/qkmswindow.h

@@ -45,7 +45,8 @@ class QKmsWindow : public QPlatformWindow
 public:
     QKmsWindow(QWindow *window);
 
-    void setGeometry(const QRect &rect);
+    void setGeometry(const QRect &rect) Q_DECL_OVERRIDE;
+    QSurfaceFormat format() const Q_DECL_OVERRIDE;
 
 private:
     QPlatformScreen *m_screen;