1 files changed, 70 insertions, 0 deletions
diff --git a/dom/canvas/WebGLVertexArrayFake.cpp b/dom/canvas/WebGLVertexArrayFake.cpp
new file mode 100644
index 000000000..ee9df6dac
--- /dev/null
+++ b/dom/canvas/WebGLVertexArrayFake.cpp
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "WebGLVertexArrayFake.h"
+
+#include "GLContext.h"
+#include "WebGLContext.h"
+
+namespace mozilla {
+
+WebGLVertexArrayFake::WebGLVertexArrayFake(WebGLContext* webgl)
+    : WebGLVertexArray(webgl)
+    , mIsVAO(false)
+{ }
+
+void
+WebGLVertexArrayFake::BindVertexArrayImpl()
+{
+    // Go through and re-bind all buffers and setup all
+    // vertex attribute pointers
+    gl::GLContext* gl = mContext->gl;
+
+    WebGLRefPtr<WebGLVertexArray> prevVertexArray = mContext->mBoundVertexArray;
+
+    mContext->mBoundVertexArray = this;
+
+    WebGLRefPtr<WebGLBuffer> prevBuffer = mContext->mBoundArrayBuffer;
+    mContext->BindBuffer(LOCAL_GL_ELEMENT_ARRAY_BUFFER, mElementArrayBuffer);
+
+    size_t i = 0;
+    for (const auto& vd : mAttribs) {
+        mContext->BindBuffer(LOCAL_GL_ARRAY_BUFFER, vd.mBuf);
+        vd.DoVertexAttribPointer(gl, i);
+
+        if (vd.mEnabled) {
+            gl->fEnableVertexAttribArray(i);
+        } else {
+            gl->fDisableVertexAttribArray(i);
+        }
+        ++i;
+    }
+
+    size_t len = prevVertexArray->mAttribs.Length();
+    for (; i < len; ++i) {
+        const auto& vd = prevVertexArray->mAttribs[i];
+
+        if (vd.mEnabled) {
+            gl->fDisableVertexAttribArray(i);
+        }
+    }
+
+    mContext->BindBuffer(LOCAL_GL_ARRAY_BUFFER, prevBuffer);
+    mIsVAO = true;
+}
+
+void
+WebGLVertexArrayFake::DeleteImpl()
+{
+    mIsVAO = false;
+}
+
+bool
+WebGLVertexArrayFake::IsVertexArrayImpl() const
+{
+    return mIsVAO;
+}
+
+} // namespace mozilla