1 files changed, 141 insertions, 0 deletions
diff --git a/tools/sk_app/win/GLWindowContext_win.cpp b/tools/sk_app/win/GLWindowContext_win.cpp
new file mode 100644
index 0000000000..17a6b32962
--- /dev/null
+++ b/tools/sk_app/win/GLWindowContext_win.cpp
@@ -0,0 +1,141 @@
+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <Windows.h>
+#include <GL/gl.h>
+#include "../GLWindowContext.h"
+#include "GrGLInterface.h"
+#include "WindowContextFactory_win.h"
+#include "win/SkWGL.h"
+
+using sk_app::GLWindowContext;
+using sk_app::DisplayParams;
+
+namespace {
+
+class GLWindowContext_win : public GLWindowContext {
+public:
+    GLWindowContext_win(HWND, const DisplayParams&);
+    ~GLWindowContext_win() override;
+
+protected:
+    void onSwapBuffers() override;
+
+    sk_sp<const GrGLInterface> onInitializeContext() override;
+    void onDestroyContext() override;
+
+private:
+    HWND              fHWND;
+    HGLRC             fHGLRC;
+
+    typedef GLWindowContext INHERITED;
+};
+
+GLWindowContext_win::GLWindowContext_win(HWND wnd, const DisplayParams& params)
+    : INHERITED(params)
+    , fHWND(wnd)
+    , fHGLRC(NULL) {
+
+    // any config code here (particularly for msaa)?
+
+    this->initializeContext();
+}
+
+GLWindowContext_win::~GLWindowContext_win() {
+    this->destroyContext();
+}
+
+sk_sp<const GrGLInterface> GLWindowContext_win::onInitializeContext() {
+    HDC dc = GetDC(fHWND);
+
+    fHGLRC = SkCreateWGLContext(dc, fDisplayParams.fMSAASampleCount, false /* deepColor */,
+                                kGLPreferCompatibilityProfile_SkWGLContextRequest);
+    if (NULL == fHGLRC) {
+        return nullptr;
+    }
+
+    // Look to see if RenderDoc is attached. If so, re-create the context with a core profile
+    if (wglMakeCurrent(dc, fHGLRC)) {
+        const GrGLInterface* glInterface = GrGLCreateNativeInterface();
+        bool renderDocAttached = glInterface->hasExtension("GL_EXT_debug_tool");
+        SkSafeUnref(glInterface);
+        if (renderDocAttached) {
+            wglDeleteContext(fHGLRC);
+            fHGLRC = SkCreateWGLContext(dc, fDisplayParams.fMSAASampleCount, false /* deepColor */,
+                                        kGLPreferCoreProfile_SkWGLContextRequest);
+            if (NULL == fHGLRC) {
+                return nullptr;
+            }
+        }
+    }
+
+    if (wglMakeCurrent(dc, fHGLRC)) {
+        glClearStencil(0);
+        glClearColor(0, 0, 0, 0);
+        glStencilMask(0xffffffff);
+        glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+
+        // use DescribePixelFormat to get the stencil and color bit depth.
+        int pixelFormat = GetPixelFormat(dc);
+        PIXELFORMATDESCRIPTOR pfd;
+        DescribePixelFormat(dc, pixelFormat, sizeof(pfd), &pfd);
+        fStencilBits = pfd.cStencilBits;
+
+        // Get sample count if the MSAA WGL extension is present
+        SkWGLExtensions extensions;
+        if (extensions.hasExtension(dc, "WGL_ARB_multisample")) {
+            static const int kSampleCountAttr = SK_WGL_SAMPLES;
+            extensions.getPixelFormatAttribiv(dc,
+                                              pixelFormat,
+                                              0,
+                                              1,
+                                              &kSampleCountAttr,
+                                              &fSampleCount);
+        } else {
+            fSampleCount = 0;
+        }
+
+        RECT rect;
+        GetClientRect(fHWND, &rect);
+        fWidth = rect.right - rect.left;
+        fHeight = rect.bottom - rect.top;
+        glViewport(0, 0, fWidth, fHeight);
+    }
+    return sk_sp<const GrGLInterface>(GrGLCreateNativeInterface());
+}
+
+
+void GLWindowContext_win::onDestroyContext() {
+    wglDeleteContext(fHGLRC);
+    fHGLRC = NULL;
+}
+
+
+void GLWindowContext_win::onSwapBuffers() {
+    HDC dc = GetDC((HWND)fHWND);
+    SwapBuffers(dc);
+    ReleaseDC((HWND)fHWND, dc);
+}
+
+
+}  // anonymous namespace
+
+namespace sk_app {
+namespace window_context_factory {
+
+WindowContext* NewGLForWin(HWND wnd, const DisplayParams& params) {
+    GLWindowContext_win* ctx = new GLWindowContext_win(wnd, params);
+    if (!ctx->isValid()) {
+        delete ctx;
+        return nullptr;
+    }
+    return ctx;
+}
+
+}  // namespace window_context_factory
+}  // namespace sk_app