Add OpenGL context to Viewer.

tools/viewer/Viewer.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "Viewer.h"
 
 #include "GMSlide.h"
@@ skipping 23 matching lines @@
                "[~][^]substring[$] [...] of bench name to run.\n"
                "Multiple matches may be separated by spaces.\n"
                "~ causes a matching bench to always be skipped\n"
                "^ requires the start of the bench to match\n"
                "$ requires the end of the bench to match\n"
                "^ and $ requires an exact match\n"
                "If a bench does not match any list entry,\n"
                "it is skipped unless some list entry starts with ~");
 DEFINE_string(skps, "skps", "Directory to read skps from.");
 
+const char *kBackendTypeStrings[sk_app::Window::kBackendTypeCount] = {
+    " [OpenGL]",
+    " [Vulkan]"
+};
+
 Viewer::Viewer(int argc, char** argv, void* platformData)
     : fCurrentMeasurement(0)
     , fDisplayStats(false)
+    , fBackendType(sk_app::Window::kVulkan_BackendType)
     , fZoomCenterX(0.0f)
     , fZoomCenterY(0.0f)
     , fZoomLevel(0.0f)
     , fZoomScale(SK_Scalar1)
 {
     memset(fMeasurements, 0, sizeof(fMeasurements));
 
     SkDebugf("Command line arguments: ");
     for (int i = 1; i < argc; ++i) {
         SkDebugf("%s ", argv[i]);
     }
     SkDebugf("\n");
 
     SkCommandLineFlags::Parse(argc, argv);
 
     fWindow = Window::CreateNativeWindow(platformData);
-    fWindow->attach(Window::kVulkan_BackendType, DisplayParams());
+    fWindow->attach(fBackendType, DisplayParams());
 
     // register callbacks
     fCommands.attach(fWindow);
     fWindow->registerPaintFunc(on_paint_handler, this);
 
     // add key-bindings
     fCommands.addCommand('s', "Overlays", "Toggle stats display", [this]() {
         this->fDisplayStats = !this->fDisplayStats;
         fWindow->inval();
     });
@@ skipping 22 matching lines @@
         this->setupCurrentSlide(previousSlide);
     });
     fCommands.addCommand(Window::Key::kUp, "Up", "Transform", "Zoom in", [this]() {
         this->changeZoomLevel(1.f / 32.f);
         fWindow->inval();
     });
     fCommands.addCommand(Window::Key::kDown, "Down", "Transform", "Zoom out", [this]() {
         this->changeZoomLevel(-1.f / 32.f);
         fWindow->inval();
     });
+#ifndef SK_BUILD_FOR_ANDROID
+    fCommands.addCommand('d', "Modes", "Change rendering backend", [this]() {
+        fWindow->detach();
+
+        if (sk_app::Window::kVulkan_BackendType == fBackendType) {
+            fBackendType = sk_app::Window::kNativeGL_BackendType;
+        } 
+        // TODO: get Vulkan -> OpenGL working without swapchain creation failure
+        //else if (sk_app::Window::kNativeGL_BackendType == fBackendType) {
+        //    fBackendType = sk_app::Window::kVulkan_BackendType;
+        //}
+
+        fWindow->attach(fBackendType, DisplayParams());
+        this->updateTitle();
+    });
+#endif
 
     // set up slides
     this->initSlides();
 
     fAnimTimer.run();
 
     // set up first frame
     fCurrentSlide = 0;
     setupCurrentSlide(-1);
     updateMatrix();
@@ skipping 56 matching lines @@
     fWindow->detach();
     delete fWindow;
 }
 
 void Viewer::updateTitle() {
     SkString title("Viewer: ");
     title.append(fSlides[fCurrentSlide]->getName());
     if (kSRGB_SkColorProfileType == fWindow->getDisplayParams().fProfileType) {
         title.append(" sRGB");
     }
+    title.append(kBackendTypeStrings[fBackendType]);
     fWindow->setTitle(title.c_str());
 }
 
 void Viewer::setupCurrentSlide(int previousSlide) {
     this->updateTitle();
     fSlides[fCurrentSlide]->load();
     if (previousSlide >= 0) {
         fSlides[previousSlide]->unload();
     }
     fWindow->inval();
@@ skipping 34 matching lines @@
 
     // TODO: add gesture support
     // Apply any gesture matrix
     //m.preConcat(fGesture.localM());
     //m.preConcat(fGesture.globalM());
 
     fLocalMatrix = m;
 }
 
 void Viewer::onPaint(SkCanvas* canvas) {
-
     int count = canvas->save();
 
     if (fWindow->supportsContentRect()) {
         SkRect contentRect = fWindow->getContentRect();
         canvas->clipRect(contentRect);
         canvas->translate(contentRect.fLeft, contentRect.fTop);
     }
 
     canvas->clear(SK_ColorWHITE);
     if (fWindow->supportsContentRect() && fWindow->scaleContentToFit()) {
@@ skipping 67 matching lines @@
     // Record measurements
     fMeasurements[fCurrentMeasurement++] = ms;
     fCurrentMeasurement &= (kMeasurementCount - 1);  // fast mod
     SkASSERT(fCurrentMeasurement < kMeasurementCount);
 
     fAnimTimer.updateTime();
     if (fSlides[fCurrentSlide]->animate(fAnimTimer) || fDisplayStats) {
         fWindow->inval();
     }
 }