1 files changed, 126 insertions, 0 deletions
diff --git a/gfx/webrender_bindings/RenderCompositorOGL.cpp b/gfx/webrender_bindings/RenderCompositorOGL.cpp
new file mode 100644
index 0000000000..9653e06d43
--- /dev/null
+++ b/gfx/webrender_bindings/RenderCompositorOGL.cpp
@@ -0,0 +1,126 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "RenderCompositorOGL.h"
+
+#include "GLContext.h"
+#include "GLContextEGL.h"
+#include "GLContextProvider.h"
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/webrender/RenderThread.h"
+#include "mozilla/widget/CompositorWidget.h"
+
+namespace mozilla::wr {
+
+extern LazyLogModule gRenderThreadLog;
+#define LOG(...) MOZ_LOG(gRenderThreadLog, LogLevel::Debug, (__VA_ARGS__))
+
+/* static */
+UniquePtr<RenderCompositor> RenderCompositorOGL::Create(
+    const RefPtr<widget::CompositorWidget>& aWidget, nsACString& aError) {
+  RefPtr<gl::GLContext> gl = RenderThread::Get()->SingletonGL();
+  if (!gl) {
+    gl = gl::GLContextProvider::CreateForCompositorWidget(
+        aWidget, /* aHardwareWebRender */ true, /* aForceAccelerated */ true);
+    RenderThread::MaybeEnableGLDebugMessage(gl);
+  }
+  if (!gl || !gl->MakeCurrent()) {
+    gfxCriticalNote << "Failed GL context creation for WebRender: "
+                    << gfx::hexa(gl.get());
+    return nullptr;
+  }
+  return MakeUnique<RenderCompositorOGL>(std::move(gl), aWidget);
+}
+
+RenderCompositorOGL::RenderCompositorOGL(
+    RefPtr<gl::GLContext>&& aGL,
+    const RefPtr<widget::CompositorWidget>& aWidget)
+    : RenderCompositor(aWidget), mGL(aGL) {
+  MOZ_ASSERT(mGL);
+  LOG("RenderCompositorOGL::RenderCompositorOGL()");
+
+  mIsEGL = aGL->GetContextType() == mozilla::gl::GLContextType::EGL;
+}
+
+RenderCompositorOGL::~RenderCompositorOGL() {
+  LOG("RenderCompositorOGL::~RenderCompositorOGL()");
+
+  if (!mGL->MakeCurrent()) {
+    gfxCriticalNote
+        << "Failed to make render context current during destroying.";
+    // Leak resources!
+    return;
+  }
+}
+
+bool RenderCompositorOGL::BeginFrame() {
+  if (!mGL->MakeCurrent()) {
+    gfxCriticalNote << "Failed to make render context current, can't draw.";
+    return false;
+  }
+
+  mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mGL->GetDefaultFramebuffer());
+
+  return true;
+}
+
+RenderedFrameId RenderCompositorOGL::EndFrame(
+    const nsTArray<DeviceIntRect>& aDirtyRects) {
+  RenderedFrameId frameId = GetNextRenderFrameId();
+  if (UsePartialPresent() && aDirtyRects.Length() > 0) {
+    gfx::IntRegion bufferInvalid;
+    const auto bufferSize = GetBufferSize();
+    for (const DeviceIntRect& rect : aDirtyRects) {
+      const auto left = std::max(0, std::min(bufferSize.width, rect.min.x));
+      const auto top = std::max(0, std::min(bufferSize.height, rect.min.y));
+
+      const auto right = std::min(bufferSize.width, std::max(0, rect.max.x));
+      const auto bottom = std::min(bufferSize.height, std::max(0, rect.max.y));
+
+      const auto width = right - left;
+      const auto height = bottom - top;
+
+      bufferInvalid.OrWith(
+          gfx::IntRect(left, (GetBufferSize().height - bottom), width, height));
+    }
+    gl()->SetDamage(bufferInvalid);
+  }
+  mGL->SwapBuffers();
+  return frameId;
+}
+
+void RenderCompositorOGL::Pause() {}
+
+bool RenderCompositorOGL::Resume() { return true; }
+
+LayoutDeviceIntSize RenderCompositorOGL::GetBufferSize() {
+  return mWidget->GetClientSize();
+}
+
+uint32_t RenderCompositorOGL::GetMaxPartialPresentRects() {
+  return gfx::gfxVars::WebRenderMaxPartialPresentRects();
+}
+
+bool RenderCompositorOGL::RequestFullRender() { return false; }
+
+bool RenderCompositorOGL::UsePartialPresent() {
+  return gfx::gfxVars::WebRenderMaxPartialPresentRects() > 0;
+}
+
+bool RenderCompositorOGL::ShouldDrawPreviousPartialPresentRegions() {
+  return true;
+}
+
+size_t RenderCompositorOGL::GetBufferAge() const {
+  if (!StaticPrefs::
+          gfx_webrender_allow_partial_present_buffer_age_AtStartup()) {
+    return 0;
+  }
+  return gl()->GetBufferAge();
+}
+
+}  // namespace mozilla::wr