webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 104 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/egl/GLContextEGLX11.cpp b/Source/WebCore/platform/graphics/egl/GLContextEGLX11.cpp
new file mode 100644
index 000000000..8fdd4cad3
--- /dev/null
+++ b/Source/WebCore/platform/graphics/egl/GLContextEGLX11.cpp
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2016 Igalia, S.L.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "GLContextEGL.h"
+
+#if USE(EGL) && PLATFORM(X11)
+#include "PlatformDisplayX11.h"
+#include "XErrorTrapper.h"
+#include "XUniquePtr.h"
+#include <EGL/egl.h>
+#include <X11/Xlib.h>
+
+namespace WebCore {
+
+GLContextEGL::GLContextEGL(PlatformDisplay& display, EGLContext context, EGLSurface surface, XUniquePixmap&& pixmap)
+    : GLContext(display)
+    , m_context(context)
+    , m_surface(surface)
+    , m_type(PixmapSurface)
+    , m_pixmap(WTFMove(pixmap))
+{
+}
+
+EGLSurface GLContextEGL::createWindowSurfaceX11(EGLDisplay display, EGLConfig config, GLNativeWindowType window)
+{
+    return eglCreateWindowSurface(display, config, static_cast<EGLNativeWindowType>(window), nullptr);
+}
+
+std::unique_ptr<GLContextEGL> GLContextEGL::createPixmapContext(PlatformDisplay& platformDisplay, EGLContext sharingContext)
+{
+    EGLDisplay display = platformDisplay.eglDisplay();
+    EGLConfig config;
+    if (!getEGLConfig(display, &config, PixmapSurface))
+        return nullptr;
+
+    static const EGLint contextAttributes[] = {
+#if USE(OPENGL_ES_2)
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+#endif
+        EGL_NONE
+    };
+    EGLContext context = eglCreateContext(display, config, sharingContext, contextAttributes);
+    if (context == EGL_NO_CONTEXT)
+        return nullptr;
+
+    EGLint visualId;
+    if (!eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &visualId)) {
+        eglDestroyContext(display, context);
+        return nullptr;
+    }
+
+    Display* x11Display = downcast<PlatformDisplayX11>(platformDisplay).native();
+
+    XVisualInfo visualInfo;
+    visualInfo.visualid = visualId;
+    int numVisuals = 0;
+    XUniquePtr<XVisualInfo> visualInfoList(XGetVisualInfo(x11Display, VisualIDMask, &visualInfo, &numVisuals));
+    if (!visualInfoList || !numVisuals) {
+        eglDestroyContext(display, context);
+        return nullptr;
+    }
+
+    // We are using VisualIDMask so there must be only one.
+    ASSERT(numVisuals == 1);
+    XUniquePixmap pixmap = XCreatePixmap(x11Display, DefaultRootWindow(x11Display), 1, 1, visualInfoList.get()[0].depth);
+    if (!pixmap) {
+        eglDestroyContext(display, context);
+        return nullptr;
+    }
+
+    // Some drivers fail to create the surface producing BadDrawable X error and the default XError handler normally aborts.
+    // However, if the X error is ignored, eglCreatePixmapSurface() ends up returning a surface and we can continue creating
+    // the context. Since this is an offscreen context, it doesn't matter if the pixmap used is not valid because we never do
+    // swap buffers. So, we use a custom XError handler here that ignores BadDrawable errors and only warns about any other
+    // errors without aborting in any case.
+    XErrorTrapper trapper(x11Display, XErrorTrapper::Policy::Warn, { BadDrawable });
+    EGLSurface surface = eglCreatePixmapSurface(display, config, reinterpret_cast<EGLNativePixmapType>(pixmap.get()), 0);
+    if (surface == EGL_NO_SURFACE) {
+        eglDestroyContext(display, context);
+        return nullptr;
+    }
+
+    return std::unique_ptr<GLContextEGL>(new GLContextEGL(platformDisplay, context, surface, WTFMove(pixmap)));
+}
+
+} // namespace WebCore
+
+#endif // USE(EGL) && PLATFORM(X11)