1 files changed, 117 insertions, 0 deletions
diff --git a/gfx/layers/opengl/CompositingRenderTargetOGL.cpp b/gfx/layers/opengl/CompositingRenderTargetOGL.cpp
new file mode 100644
index 0000000000..9fbc207a6b
--- /dev/null
+++ b/gfx/layers/opengl/CompositingRenderTargetOGL.cpp
@@ -0,0 +1,117 @@
+/* -*- 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 "CompositingRenderTargetOGL.h"
+#include "GLContext.h"
+#include "GLReadTexImageHelper.h"
+#include "ScopedGLHelpers.h"
+#include "mozilla/gfx/2D.h"
+
+namespace mozilla {
+namespace layers {
+
+using namespace mozilla::gfx;
+using namespace mozilla::gl;
+
+CompositingRenderTargetOGL::~CompositingRenderTargetOGL() {
+  if (mGLResourceOwnership == GLResourceOwnership::OWNED_BY_RENDER_TARGET &&
+      mGL && mGL->MakeCurrent()) {
+    mGL->fDeleteTextures(1, &mTextureHandle);
+    mGL->fDeleteFramebuffers(1, &mFBO);
+  }
+}
+
+void CompositingRenderTargetOGL::BindTexture(GLenum aTextureUnit,
+                                             GLenum aTextureTarget) {
+  MOZ_ASSERT(!mNeedInitialization);
+  MOZ_ASSERT(mTextureHandle != 0);
+  mGL->fActiveTexture(aTextureUnit);
+  mGL->fBindTexture(aTextureTarget, mTextureHandle);
+}
+
+void CompositingRenderTargetOGL::BindRenderTarget() {
+  bool needsClear = false;
+
+  if (mNeedInitialization) {
+    Initialize(mNeedInitialization->mFBOTextureTarget);
+    if (mNeedInitialization->mInitMode == INIT_MODE_CLEAR) {
+      needsClear = true;
+      mClearOnBind = false;
+    }
+    mNeedInitialization = Nothing();
+  } else {
+    GLuint fbo = GetFBO();
+    mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, fbo);
+    GLenum result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
+    if (result != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
+      // The main framebuffer (0) of non-offscreen contexts
+      // might be backed by a EGLSurface that needs to be renewed.
+      if (mFBO == 0 && !mGL->IsOffscreen()) {
+        mGL->RenewSurface(mCompositor->GetWidget());
+        result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
+      }
+      if (result != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
+        nsAutoCString msg;
+        msg.AppendPrintf(
+            "Framebuffer not complete -- CheckFramebufferStatus returned 0x%x, "
+            "GLContext=%p, IsOffscreen()=%d, mFBO=%d, "
+            "aRect.width=%d, aRect.height=%d",
+            result, mGL.get(), mGL->IsOffscreen(), mFBO, mSize.width,
+            mSize.height);
+        NS_WARNING(msg.get());
+      }
+    }
+
+    needsClear = mClearOnBind;
+  }
+
+  if (needsClear) {
+    ScopedGLState scopedScissorTestState(mGL, LOCAL_GL_SCISSOR_TEST, true);
+    ScopedScissorRect autoScissorRect(mGL, 0, 0, mSize.width, mSize.height);
+    mGL->fClearColor(0.0, 0.0, 0.0, 0.0);
+    mGL->fClearDepth(0.0);
+    mGL->fClear(LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT);
+  }
+}
+
+GLuint CompositingRenderTargetOGL::GetFBO() const {
+  MOZ_ASSERT(!mNeedInitialization);
+  return mFBO == 0 ? mGL->GetDefaultFramebuffer() : mFBO;
+}
+
+#ifdef MOZ_DUMP_PAINTING
+already_AddRefed<DataSourceSurface> CompositingRenderTargetOGL::Dump(
+    Compositor* aCompositor) {
+  MOZ_ASSERT(!mNeedInitialization);
+  CompositorOGL* compositorOGL = aCompositor->AsCompositorOGL();
+  return ReadBackSurface(mGL, mTextureHandle, true,
+                         compositorOGL->GetFBOFormat());
+}
+#endif
+
+void CompositingRenderTargetOGL::Initialize(GLenum aFBOTextureTarget) {
+  // TODO: call mGL->GetBackbufferFB(), use that
+  GLuint fbo = mFBO == 0 ? mGL->GetDefaultFramebuffer() : mFBO;
+  mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, fbo);
+  mGL->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0,
+                             aFBOTextureTarget, mTextureHandle, 0);
+
+  // Making this call to fCheckFramebufferStatus prevents a crash on
+  // PowerVR. See bug 695246.
+  GLenum result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
+  if (result != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
+    nsAutoCString msg;
+    msg.AppendPrintf(
+        "Framebuffer not complete -- error 0x%x, aFBOTextureTarget 0x%x, mFBO "
+        "%d, mTextureHandle %d, aRect.width %d, aRect.height %d",
+        result, aFBOTextureTarget, mFBO, mTextureHandle, mSize.width,
+        mSize.height);
+    NS_ERROR(msg.get());
+  }
+}
+
+}  // namespace layers
+}  // namespace mozilla