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/*
* 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 "GLContext.h"
#if USE(EGL) && PLATFORM(X11)
#include "PlatformDisplayX11.h"
#include "XErrorTrapper.h"
#include "XUniquePtr.h"
#include <X11/Xlib.h>
#include <epoxy/egl.h>
namespace WebCore {
GLContext::GLContext(PlatformDisplay& display, EGLContext context, EGLSurface surface, EGLConfig config, XUniquePixmap&& pixmap)
: m_display(display)
, m_context(context)
, m_surface(surface)
, m_config(config)
, m_type(PixmapSurface)
, m_pixmap(WTFMove(pixmap))
{
}
EGLSurface GLContext::createWindowSurfaceX11(EGLDisplay display, EGLConfig config, GLNativeWindowType window)
{
return eglCreateWindowSurface(display, config, static_cast<EGLNativeWindowType>(window), nullptr);
}
std::unique_ptr<GLContext> GLContext::createPixmapContext(PlatformDisplay& platformDisplay, EGLContext sharingContext)
{
EGLConfig config;
if (!getEGLConfig(platformDisplay, &config, PixmapSurface))
return nullptr;
EGLContext context = createContextForEGLVersion(platformDisplay, config, sharingContext);
if (context == EGL_NO_CONTEXT)
return nullptr;
EGLDisplay display = platformDisplay.eglDisplay();
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, (EGLNativePixmapType)pixmap.get(), 0);
if (surface == EGL_NO_SURFACE) {
eglDestroyContext(display, context);
return nullptr;
}
return makeUnique<GLContext>(platformDisplay, context, surface, config, WTFMove(pixmap));
}
} // namespace WebCore
#endif // USE(EGL) && PLATFORM(X11)
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