Add Desktop OpenGL backend for Windows

Enabling rendering into a WGL backbuffer, in addition to the EGL/angle
one.

Change-Id: I8f2e3f5ecf52b6db22712b1129059f462725a256
Reviewed-by: Andras Becsi <andras.becsi@digia.com>

9 files changed, 151 insertions, 20 deletions

diff --git a/src/3rdparty b/src/3rdparty
-Subproject e7cb808b6fcb765ad503068fa47c165c29a7570
+Subproject 0f43b623079ebd5a3d78978ed187f52bcba7e11
diff --git a/src/core/config/windows.pri b/src/core/config/windows.pri
index 520500c63..f7644c83b 100644
--- a/src/core/config/windows.pri
+++ b/src/core/config/windows.pri
@@ -17,6 +17,14 @@ GYP_ARGS += "-D perl_exe=\"perl.exe\" -D bison_exe=\"bison.exe\" -D gperf_exe=\"
 # Gyp's parallel processing is broken on Windows
 GYP_ARGS += "--no-parallel"
 
-CONFIG(release, debug|release): GYP_ARGS+= "-D qt_egl_library=\"libEGL.lib\" -D qt_glesv2_library=\"libGLESv2.lib\""
-else: GYP_ARGS+= "-D qt_egl_library=\"libEGLd.lib\" -D qt_glesv2_library=\"libGLESv2d.lib\""
+contains(QT_CONFIG, angle) {
+    CONFIG(release, debug|release) {
+        GYP_ARGS += "-D qt_egl_library=\"libEGL.lib\" -D qt_glesv2_library=\"libGLESv2.lib\""
+    } else {
+        GYP_ARGS += "-D qt_egl_library=\"libEGLd.lib\" -D qt_glesv2_library=\"libGLESv2d.lib\""
+    }
+    GYP_ARGS += "-D qt_gl=\"angle\""
+} else {
+    GYP_ARGS += "-D qt_gl=\"opengl\""
+}
 
diff --git a/src/core/content_browser_client_qt.cpp b/src/core/content_browser_client_qt.cpp
index ba4759ad4..11e068dca 100644
--- a/src/core/content_browser_client_qt.cpp
+++ b/src/core/content_browser_client_qt.cpp
@@ -250,7 +250,7 @@ public:
             if (gfx::GetGLImplementation() == gfx::kGLImplementationEGLGLES2)
                 m_handle = pni->nativeResourceForContext(QByteArrayLiteral("eglContext"), qtContext);
             else
-                qFatal("Only the EGLGLES2 implementation is supported on %s platform.", platform.toLatin1().constData());
+                m_handle = pni->nativeResourceForContext(QByteArrayLiteral("renderingcontext"), qtContext);
         } else {
             qFatal("%s platform not yet supported", platform.toLatin1().constData());
             // Add missing platforms once they work.
diff --git a/src/core/delegated_frame_node.cpp b/src/core/delegated_frame_node.cpp
index 3d3e0dd8f..1a393a0c7 100644
--- a/src/core/delegated_frame_node.cpp
+++ b/src/core/delegated_frame_node.cpp
@@ -64,6 +64,7 @@
 #include "cc/quads/yuv_video_draw_quad.h"
 #include <QOpenGLContext>
 #include <QOpenGLFramebufferObject>
+#include <QOpenGLFunctions>
 #include <QSGAbstractRenderer>
 #include <QSGEngine>
 #include <QSGSimpleRectNode>
@@ -75,7 +76,7 @@
 #include <EGL/eglext.h>
 #endif
 
-class RenderPassTexture : public QSGTexture
+class RenderPassTexture : public QSGTexture, protected QOpenGLFunctions
 {
 public:
     RenderPassTexture(const cc::RenderPass::Id &id);
@@ -105,7 +106,7 @@ private:
     QScopedPointer<QOpenGLFramebufferObject> m_fbo;
 };
 
-class MailboxTexture : public QSGTexture {
+class MailboxTexture : public QSGTexture, protected QOpenGLFunctions {
 public:
     MailboxTexture(const cc::TransferableResource &resource);
     virtual int textureId() const Q_DECL_OVERRIDE { return m_textureId; }
@@ -232,7 +233,14 @@ static void waitChromiumSync(gfx::TransferableFence *sync)
         break;
     case gfx::TransferableFence::ArbSync:
 #ifdef GL_ARB_sync
-        glWaitSync(sync->arb.sync, 0, GL_TIMEOUT_IGNORED);
+        typedef void (QOPENGLF_APIENTRYP WaitSyncPtr)(GLsync sync, GLbitfield flags, GLuint64 timeout);
+        static WaitSyncPtr glWaitSync_ = 0;
+        if (!glWaitSync_) {
+            QOpenGLContext *context = QOpenGLContext::currentContext();
+            glWaitSync_ = (WaitSyncPtr)context->getProcAddress("glWaitSync");
+            Q_ASSERT(glWaitSync_);
+        }
+        glWaitSync_(sync->arb.sync, 0, GL_TIMEOUT_IGNORED);
 #endif
         break;
     }
@@ -270,7 +278,14 @@ static void deleteChromiumSync(gfx::TransferableFence *sync)
         break;
     case gfx::TransferableFence::ArbSync:
 #ifdef GL_ARB_sync
-        glDeleteSync(sync->arb.sync);
+        typedef void (QOPENGLF_APIENTRYP DeleteSyncPtr)(GLsync sync);
+        static DeleteSyncPtr glDeleteSync_ = 0;
+        if (!glDeleteSync_) {
+            QOpenGLContext *context = QOpenGLContext::currentContext();
+            glDeleteSync_ = (DeleteSyncPtr)context->getProcAddress("glDeleteSync");
+            Q_ASSERT(glDeleteSync_);
+        }
+        glDeleteSync_(sync->arb.sync);
         sync->reset();
 #endif
         break;
@@ -286,6 +301,7 @@ RenderPassTexture::RenderPassTexture(const cc::RenderPass::Id &id)
     , m_sgEngine(new QSGEngine)
     , m_rootNode(new QSGRootNode)
 {
+    initializeOpenGLFunctions();
 }
 
 void RenderPassTexture::bind()
@@ -330,6 +346,7 @@ MailboxTexture::MailboxTexture(const cc::TransferableResource &resource)
     , m_target(GL_TEXTURE_2D)
     , m_importCount(1)
 {
+    initializeOpenGLFunctions();
 }
 
 void MailboxTexture::bind()
diff --git a/src/core/gl_context_qt.cpp b/src/core/gl_context_qt.cpp
index 6aec2d3b3..e1255219d 100644
--- a/src/core/gl_context_qt.cpp
+++ b/src/core/gl_context_qt.cpp
@@ -41,11 +41,16 @@
 #include <QThread>
 #include <qpa/qplatformnativeinterface.h>
 #include "ui/gl/gl_context_egl.h"
+#include "ui/gl/gl_implementation.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
+#if defined(OS_WIN)
+#include "ui/gl/gl_context_wgl.h"
+#endif
+
 QT_BEGIN_NAMESPACE
 
 Q_GUI_EXPORT QOpenGLContext *qt_gl_global_share_context();
@@ -135,7 +140,16 @@ namespace gfx {
 
 scoped_refptr<GLContext> GLContext::CreateGLContext(GLShareGroup* share_group, GLSurface* compatible_surface, GpuPreference gpu_preference)
 {
-    scoped_refptr<GLContext> context(new GLContextEGL(share_group));
+#if defined(OS_WIN)
+    scoped_refptr<GLContext> context;
+    if (GetGLImplementation() == kGLImplementationDesktopGL)
+        context = new GLContextWGL(share_group);
+    else
+        context = new GLContextEGL(share_group);
+#else
+    scoped_refptr<GLContext> context = new GLContextEGL(share_group);
+#endif
+
     if (!GLContextHelper::initializeContext(context.get(), compatible_surface))
         return NULL;
 
diff --git a/src/core/gl_surface_qt.cpp b/src/core/gl_surface_qt.cpp
index 72758cbff..cc2809af1 100644
--- a/src/core/gl_surface_qt.cpp
+++ b/src/core/gl_surface_qt.cpp
@@ -64,6 +64,11 @@ extern "C" {
 }
 #endif
 
+#if defined(OS_WIN)
+#include "ui/gl/gl_surface_wgl.h"
+#include "ui/gl/gl_context_wgl.h"
+#endif
+
 using ui::GetLastEGLErrorString;
 
 namespace gfx {
@@ -239,7 +244,75 @@ void* GLSurfaceQtGLX::GetHandle()
     return reinterpret_cast<void*>(m_surfaceBuffer);
 }
 
-#endif // defined(USE_X11)
+#elif defined(OS_WIN)
+
+class GLSurfaceQtWGL: public GLSurfaceQt {
+public:
+    explicit GLSurfaceQtWGL(const gfx::Size& size);
+
+    static bool InitializeOneOff();
+
+    virtual bool Initialize() Q_DECL_OVERRIDE;
+    virtual void Destroy() Q_DECL_OVERRIDE;
+    virtual void* GetHandle() Q_DECL_OVERRIDE;
+    virtual void* GetDisplay() Q_DECL_OVERRIDE;
+    virtual void* GetConfig() Q_DECL_OVERRIDE;
+
+protected:
+    ~GLSurfaceQtWGL();
+
+private:
+    PbufferGLSurfaceWGL *m_surfaceBuffer;
+    DISALLOW_COPY_AND_ASSIGN(GLSurfaceQtWGL);
+};
+
+GLSurfaceQtWGL::GLSurfaceQtWGL(const gfx::Size& size)
+    : GLSurfaceQt(size),
+      m_surfaceBuffer(0)
+{
+}
+
+GLSurfaceQtWGL::~GLSurfaceQtWGL()
+{
+    Destroy();
+}
+
+bool GLSurfaceQtWGL::InitializeOneOff()
+{
+    return GLSurfaceWGL::InitializeOneOff();
+}
+
+bool GLSurfaceQtWGL::Initialize()
+{
+    m_surfaceBuffer = new PbufferGLSurfaceWGL(m_size);
+
+    return m_surfaceBuffer->Initialize();
+}
+
+void GLSurfaceQtWGL::Destroy()
+{
+    if (m_surfaceBuffer) {
+        delete m_surfaceBuffer;
+        m_surfaceBuffer = 0;
+    }
+}
+
+void *GLSurfaceQtWGL::GetHandle()
+{
+    return m_surfaceBuffer->GetHandle();
+}
+
+void *GLSurfaceQtWGL::GetDisplay()
+{
+    return m_surfaceBuffer->GetDisplay();
+}
+
+void *GLSurfaceQtWGL::GetConfig()
+{
+    return m_surfaceBuffer->GetConfig();
+}
+
+#endif // defined(OS_WIN)
 
 GLSurfaceQt::GLSurfaceQt()
 {
@@ -287,9 +360,11 @@ bool GLSurface::InitializeOneOffInternal()
     if (GetGLImplementation() == kGLImplementationEGLGLES2)
         return GLSurfaceQtEGL::InitializeOneOff();
 
-#if defined(USE_X11)
     if (GetGLImplementation() == kGLImplementationDesktopGL)
+#if defined(USE_X11)
         return GLSurfaceQtGLX::InitializeOneOff();
+#elif defined(OS_WIN)
+        return GLSurfaceQtWGL::InitializeOneOff();
 #endif
 
     return false;
@@ -456,6 +531,11 @@ GLSurface::CreateOffscreenGLSurface(const gfx::Size& size)
         if (!surface->Initialize())
             return NULL;
         return surface;
+#elif defined(OS_WIN)
+        scoped_refptr<GLSurface> surface = new GLSurfaceQtWGL(size);
+        if (!surface->Initialize())
+            return NULL;
+        return surface;
 #else
         LOG(ERROR) << "Desktop GL is not supported on this platform.";
         Q_UNREACHABLE();
diff --git a/src/core/web_engine_context.cpp b/src/core/web_engine_context.cpp
index 7c0a45b68..13daef5f6 100644
--- a/src/core/web_engine_context.cpp
+++ b/src/core/web_engine_context.cpp
@@ -75,6 +75,7 @@
 #include "web_engine_library_info.h"
 #include "web_engine_visited_links_manager.h"
 #include <QGuiApplication>
+#include <QOpenGLContext>
 #include <QStringList>
 #include <QVector>
 #include <qpa/qplatformnativeinterface.h>
@@ -170,10 +171,16 @@ WebEngineContext::WebEngineContext()
 
     GLContextHelper::initialize();
 
-    // Tell Chromium to use EGL instead of GLX if the Qt xcb plugin also does.
-    if ((qApp->platformName() == QStringLiteral("xcb") || qApp->platformName() == QStringLiteral("eglfs"))
-        && qApp->platformNativeInterface()->nativeResourceForWindow(QByteArrayLiteral("egldisplay"), 0))
-        parsedCommandLine->AppendSwitchASCII(switches::kUseGL, gfx::kGLImplementationEGLName);
+    const char *glType;
+    switch (QOpenGLContext::currentContext()->openGLModuleType()) {
+    case QOpenGLContext::LibGL:
+        glType = gfx::kGLImplementationDesktopName;
+        break;
+    case QOpenGLContext::LibGLES:
+        glType = gfx::kGLImplementationEGLName;
+        break;
+    }
+    parsedCommandLine->AppendSwitchASCII(switches::kUseGL, glType);
 
     content::UtilityProcessHostImpl::RegisterUtilityMainThreadFactory(content::CreateInProcessUtilityThread);
     content::RenderProcessHostImpl::RegisterRendererMainThreadFactory(content::CreateInProcessRendererThread);
diff --git a/src/core/yuv_video_node.cpp b/src/core/yuv_video_node.cpp
index 256bf224e..0e3f17d85 100644
--- a/src/core/yuv_video_node.cpp
+++ b/src/core/yuv_video_node.cpp
@@ -36,6 +36,8 @@
 
 #include "yuv_video_node.h"
 
+#include <QtGui/qopenglcontext.h>
+#include <QtGui/qopenglfunctions.h>
 #include <QtQuick/qsgtexture.h>
 
 class YUVVideoMaterialShader : public QSGMaterialShader
@@ -159,11 +161,13 @@ void YUVVideoMaterialShader::updateState(const RenderState &state, QSGMaterial *
     program()->setUniformValue(m_id_uTexture, 1);
     program()->setUniformValue(m_id_vTexture, 2);
 
-    glActiveTexture(GL_TEXTURE1);
+    QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
+
+    glFuncs.glActiveTexture(GL_TEXTURE1);
     mat->m_uTexture->bind();
-    glActiveTexture(GL_TEXTURE2);
+    glFuncs.glActiveTexture(GL_TEXTURE2);
     mat->m_vTexture->bind();
-    glActiveTexture(GL_TEXTURE0); // Finish with 0 as default texture unit
+    glFuncs.glActiveTexture(GL_TEXTURE0); // Finish with 0 as default texture unit
     mat->m_yTexture->bind();
 
     program()->setUniformValue(m_id_texOffset, mat->m_texCoordRect.topLeft());
@@ -203,11 +207,13 @@ void YUVAVideoMaterialShader::updateState(const RenderState &state, QSGMaterial
     YUVAVideoMaterial *mat = static_cast<YUVAVideoMaterial *>(newMaterial);
     program()->setUniformValue(m_id_aTexture, 3);
 
-    glActiveTexture(GL_TEXTURE3);
+    QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
+
+    glFuncs.glActiveTexture(GL_TEXTURE3);
     mat->m_aTexture->bind();
 
     // Reset the default texture unit.
-    glActiveTexture(GL_TEXTURE0);
+    glFuncs.glActiveTexture(GL_TEXTURE0);
 }
 
 
diff --git a/tools/qmake/mkspecs/features/functions.prf b/tools/qmake/mkspecs/features/functions.prf
index 2c4b9e0c2..789af9a13 100644
--- a/tools/qmake/mkspecs/features/functions.prf
+++ b/tools/qmake/mkspecs/features/functions.prf
@@ -1,7 +1,6 @@
 defineTest(isPlatformSupported) {
   static: return(false)
   osx:lessThan(QMAKE_XCODE_VERSION, 5.1): return(false)
-  win32: !contains(QT_CONFIG, angle): return(false)
 
   linux-g++|win32-msvc2013|macx-clang: return(true)
   android-g++-b2qt: return(true)