Moved GLContext class to gfx/gl.

Now it can be used by code outside of the gpu project, for example AcceleratedSurface.

TEST=trybots
BUG=none

Review URL: http://codereview.chromium.org/1694003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@45240 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 109 insertions, 0 deletions

diff --git a/gfx/gl/gl_context_osmesa.cc b/gfx/gl/gl_context_osmesa.cc
new file mode 100644
index 0000000..80b1cc9
--- /dev/null
+++ b/gfx/gl/gl_context_osmesa.cc
@@ -0,0 +1,109 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <GL/glew.h>
+#include <GL/osmew.h>
+
+#include <algorithm>
+
+#include "gfx/gl/gl_context_osmesa.h"
+
+namespace gfx {
+
+OSMesaGLContext::OSMesaGLContext()
+#if !defined(UNIT_TEST)
+    : context_(NULL)
+#endif
+{
+}
+
+OSMesaGLContext::~OSMesaGLContext() {
+}
+
+bool OSMesaGLContext::Initialize(void* shared_handle) {
+#if !defined(UNIT_TEST)
+  DCHECK(!context_);
+
+  size_ = gfx::Size(1, 1);
+  buffer_.reset(new int32[1]);
+
+  context_ = OSMesaCreateContext(GL_RGBA,
+                                 static_cast<OSMesaContext>(shared_handle));
+  return context_ != NULL;
+#else
+  return true;
+#endif
+}
+
+void OSMesaGLContext::Destroy() {
+#if !defined(UNIT_TEST)
+  if (context_) {
+    OSMesaDestroyContext(static_cast<OSMesaContext>(context_));
+    context_ = NULL;
+  }
+#endif
+}
+
+bool OSMesaGLContext::MakeCurrent() {
+#if !defined(UNIT_TEST)
+  DCHECK(context_);
+  return OSMesaMakeCurrent(static_cast<OSMesaContext>(context_),
+                           buffer_.get(),
+                           GL_UNSIGNED_BYTE,
+                           size_.width(), size_.height()) == GL_TRUE;
+#endif
+  return true;
+}
+
+bool OSMesaGLContext::IsCurrent() {
+#if !defined(UNIT_TEST)
+  DCHECK(context_);
+  return context_ == OSMesaGetCurrentContext();
+#endif
+  return true;
+}
+
+bool OSMesaGLContext::IsOffscreen() {
+  return true;
+}
+
+void OSMesaGLContext::SwapBuffers() {
+  NOTREACHED() << "Should not call SwapBuffers on an OSMesaGLContext.";
+}
+
+gfx::Size OSMesaGLContext::GetSize() {
+  return size_;
+}
+
+void* OSMesaGLContext::GetHandle() {
+  return context_;
+}
+
+void OSMesaGLContext::Resize(const gfx::Size& new_size) {
+  if (new_size == size_)
+    return;
+
+  // Allocate a new back buffer.
+  scoped_array<int32> new_buffer(new int32[new_size.GetArea()]);
+  memset(new_buffer.get(), 0, new_size.GetArea() * sizeof(new_buffer[0]));
+
+  // Copy the current back buffer into the new buffer.
+  int copy_width = std::min(size_.width(), new_size.width());
+  int copy_height = std::min(size_.height(), new_size.height());
+  for (int y = 0; y < copy_height; ++y) {
+    for (int x = 0; x < copy_width; ++x) {
+      new_buffer[y * new_size.width() + x] = buffer_[y * size_.width() + x];
+    }
+  }
+
+  buffer_.reset(new_buffer.release());
+  size_ = new_size;
+
+  // If this context is current, need to call MakeCurrent again so OSMesa uses
+  // the new buffer.
+  if (IsCurrent())
+    MakeCurrent();
+}
+
+}  // namespace gfx