Enable extension support and debug layer.

src/gpu/vk/GrVkExtensions.cpp

Index: src/gpu/vk/GrVkExtensions.cpp
diff --git a/src/gpu/vk/GrVkExtensions.cpp b/src/gpu/vk/GrVkExtensions.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8fa99cf9fc073ae5dcd3e15b3bf53beedec0a39f
--- /dev/null
+++ b/src/gpu/vk/GrVkExtensions.cpp
@@ -0,0 +1,252 @@
+/*
+ * 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 "vk/GrVkExtensions.h"
+#include "vk/GrVkUtil.h"
+
+#include "SkTSearch.h"
+#include "SkTSort.h"
+
+namespace { // This cannot be static because it is used as a template parameter.
+inline bool extension_compare(const SkString& a, const SkString& b) {
+    return strcmp(a.c_str(), b.c_str()) < 0;
+}
+}
+
+// finds the index of ext in strings or a negative result if ext is not found.
+static int find_string(const SkTArray<SkString>& strings, const char ext[]) {
+    if (strings.empty()) {
+        return -1;
+    }
+    SkString extensionStr(ext);
+    int idx = SkTSearch<SkString, extension_compare>(&strings.front(),
+                                                     strings.count(),
+                                                     extensionStr,
+                                                     sizeof(SkString));
+    return idx;
+}
+
+GrVkExtensions::GrVkExtensions(const GrVkExtensions& that) 
+    : fInstanceExtensionStrings(new SkTArray<SkString>)
+    , fDeviceExtensionStrings(new SkTArray<SkString>)
+    , fInstanceLayerStrings(new SkTArray<SkString>)
+    , fDeviceLayerStrings(new SkTArray<SkString>) {
+    *this = that;
+}
+
+GrVkExtensions& GrVkExtensions::operator=(const GrVkExtensions& that) {
+    *fInstanceExtensionStrings = *that.fInstanceExtensionStrings;
+    *fDeviceExtensionStrings = *that.fDeviceExtensionStrings;
+    *fInstanceLayerStrings = *that.fInstanceLayerStrings;
+    *fDeviceLayerStrings = *that.fDeviceLayerStrings;
+
+    fInitialized = that.fInitialized;
+    return *this;
+}
+
+bool GrVkExtensions::init(
+    uint32_t specVersion,
+    PFN_vkEnumerateInstanceExtensionProperties enumerateInstanceExtensionProperties,
+    PFN_vkEnumerateDeviceExtensionProperties enumerateDeviceExtensionProperties,
+    PFN_vkEnumerateInstanceLayerProperties enumerateInstanceLayerProperties,
+    PFN_vkEnumerateDeviceLayerProperties enumerateDeviceLayerProperties) {
+    fInitialized = false;
+    this->reset();
+
+    if (!enumerateInstanceExtensionProperties ||
+        !enumerateDeviceExtensionProperties ||
+        !enumerateInstanceLayerProperties ||
+        !enumerateDeviceLayerProperties) {
+        return false;
+    }
+
+    // instance extensions
+    uint32_t extensionCount = 0;
+    VkResult res = enumerateInstanceExtensionProperties(nullptr, &extensionCount, nullptr);
+
+    VkExtensionProperties* extensions = new VkExtensionProperties[extensionCount];
+    res = enumerateInstanceExtensionProperties(nullptr, &extensionCount, extensions);
+
+    fInstanceExtensionStrings->push_back_n(extensionCount);
+    for (uint32_t i = 0; i < extensionCount; ++i) {
+        if (specVersion >= extensions[i].specVersion) {
+            (*fInstanceExtensionStrings)[i] = extensions[i].extensionName;
+        }
+    }
+    delete [] extensions;
+
+    if (!fInstanceExtensionStrings->empty()) {
+        SkTLessFunctionToFunctorAdaptor<SkString, extension_compare> cmp;
+        SkTQSort(&fInstanceExtensionStrings->front(), &fInstanceExtensionStrings->back(), cmp);
+    }
+
+    fInitialized = true;
+    return true;
+}
+
+
+bool GrVkExtensions::hasInstanceExtension(const char ext[]) const {
+    SkASSERT(fInitialized);
+
+    return find_string(*fInstanceExtensionStrings, ext) >= 0;
+}
+
+bool GrVkExtensions::hasDeviceExtension(const char ext[]) const {
+    SkASSERT(fInitialized);
+
+    return find_string(*fDeviceExtensionStrings, ext) >= 0;
+}
+
+bool GrVkExtensions::hasInstanceLayer(const char ext[]) const {
+    SkASSERT(fInitialized);
+
+    return find_string(*fInstanceLayerStrings, ext) >= 0;
+}
+
+bool GrVkExtensions::hasDeviceLayer(const char ext[]) const {
+    SkASSERT(fInitialized);
+
+    return find_string(*fDeviceLayerStrings, ext) >= 0;
+}
+
+
+bool GrVkExtensions::removeInstanceExtension(const char ext[]) {
+    SkASSERT(fInitialized);
+    int idx = find_string(*fInstanceExtensionStrings, ext);
+    if (idx >= 0) {
+        // This is not terribly effecient but we really only expect this function to be called at
+        // most a handful of times when our test programs start.
+        SkAutoTDelete< SkTArray<SkString> > oldStrings(fInstanceExtensionStrings.release());
+        fInstanceExtensionStrings.reset(new SkTArray<SkString>(oldStrings->count() - 1));
+        fInstanceExtensionStrings->push_back_n(idx, &oldStrings->front());
+        fInstanceExtensionStrings->push_back_n(oldStrings->count() - idx-1, &(*oldStrings)[idx]+1);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool GrVkExtensions::removeDeviceExtension(const char ext[]) {
+    SkASSERT(fInitialized);
+    int idx = find_string(*fDeviceExtensionStrings, ext);
+    if (idx >= 0) {
+        // This is not terribly effecient but we really only expect this function to be called at
+        // most a handful of times when our test programs start.
+        SkAutoTDelete< SkTArray<SkString> > oldStrings(fDeviceExtensionStrings.release());
+        fDeviceExtensionStrings.reset(new SkTArray<SkString>(oldStrings->count() - 1));
+        fDeviceExtensionStrings->push_back_n(idx, &oldStrings->front());
+        fDeviceExtensionStrings->push_back_n(oldStrings->count() - idx-1, &(*oldStrings)[idx] + 1);
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
+bool GrVkExtensions::removeInstanceLayer(const char ext[]) {
+    SkASSERT(fInitialized);
+    int idx = find_string(*fInstanceLayerStrings, ext);
+    if (idx >= 0) {
+        // This is not terribly effecient but we really only expect this function to be called at
+        // most a handful of times when our test programs start.
+        SkAutoTDelete< SkTArray<SkString> > oldStrings(fInstanceLayerStrings.release());
+        fInstanceLayerStrings.reset(new SkTArray<SkString>(oldStrings->count() - 1));
+        fInstanceLayerStrings->push_back_n(idx, &oldStrings->front());
+        fInstanceLayerStrings->push_back_n(oldStrings->count() - idx - 1, &(*oldStrings)[idx] + 1);
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
+bool GrVkExtensions::removeDeviceLayer(const char ext[]) {
+    SkASSERT(fInitialized);
+    int idx = find_string(*fDeviceLayerStrings, ext);
+    if (idx >= 0) {
+        // This is not terribly effecient but we really only expect this function to be called at
+        // most a handful of times when our test programs start.
+        SkAutoTDelete< SkTArray<SkString> > oldStrings(fDeviceLayerStrings.release());
+        fDeviceLayerStrings.reset(new SkTArray<SkString>(oldStrings->count() - 1));
+        fDeviceLayerStrings->push_back_n(idx, &oldStrings->front());
+        fDeviceLayerStrings->push_back_n(oldStrings->count() - idx - 1, &(*oldStrings)[idx] + 1);
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
+void GrVkExtensions::addInstanceExtension(const char ext[]) {
+    int idx = find_string(*fInstanceExtensionStrings, ext);
+    if (idx < 0) {
+        // This is not the most effecient approach since we end up doing a full sort of the
+        // extensions after the add
+        fInstanceExtensionStrings->push_back().set(ext);
+        SkTLessFunctionToFunctorAdaptor<SkString, extension_compare> cmp;
+        SkTQSort(&fInstanceExtensionStrings->front(), &fInstanceExtensionStrings->back(), cmp);
+    }
+}
+
+void GrVkExtensions::addDeviceExtension(const char ext[]) {
+    int idx = find_string(*fDeviceExtensionStrings, ext);
+    if (idx < 0) {
+        // This is not the most effecient approach since we end up doing a full sort of the
+        // extensions after the add
+        fDeviceExtensionStrings->push_back().set(ext);
+        SkTLessFunctionToFunctorAdaptor<SkString, extension_compare> cmp;
+        SkTQSort(&fDeviceExtensionStrings->front(), &fDeviceExtensionStrings->back(), cmp);
+    }
+}
+
+void GrVkExtensions::addInstanceLayer(const char ext[]) {
+    int idx = find_string(*fInstanceLayerStrings, ext);
+    if (idx < 0) {
+        // This is not the most effecient approach since we end up doing a full sort of the
+        // extensions after the add
+        fInstanceLayerStrings->push_back().set(ext);
+        SkTLessFunctionToFunctorAdaptor<SkString, extension_compare> cmp;
+        SkTQSort(&fInstanceLayerStrings->front(), &fInstanceLayerStrings->back(), cmp);
+    }
+}
+
+void GrVkExtensions::addDeviceLayer(const char ext[]) {
+    int idx = find_string(*fDeviceLayerStrings, ext);
+    if (idx < 0) {
+        // This is not the most effecient approach since we end up doing a full sort of the
+        // extensions after the add
+        fDeviceLayerStrings->push_back().set(ext);
+        SkTLessFunctionToFunctorAdaptor<SkString, extension_compare> cmp;
+        SkTQSort(&fDeviceLayerStrings->front(), &fDeviceLayerStrings->back(), cmp);
+    }
+}
+
+void GrVkExtensions::print(const char* sep) const {
+    if (nullptr == sep) {
+        sep = " ";
+    }
+    int cnt = fInstanceExtensionStrings->count();
+    SkDebugf("Instance Extensions: ");
+    for (int i = 0; i < cnt; ++i) {
+        SkDebugf("%s%s", (*fInstanceExtensionStrings)[i].c_str(), (i < cnt - 1) ? sep : "");
+    }
+    cnt = fDeviceExtensionStrings->count();
+    SkDebugf("\nDevice Extensions: ");
+    for (int i = 0; i < cnt; ++i) {
+        SkDebugf("%s%s", (*fDeviceExtensionStrings)[i].c_str(), (i < cnt - 1) ? sep : "");
+    }
+    cnt = fInstanceLayerStrings->count();
+    SkDebugf("\nInstance Layers: ");
+    for (int i = 0; i < cnt; ++i) {
+        SkDebugf("%s%s", (*fInstanceLayerStrings)[i].c_str(), (i < cnt - 1) ? sep : "");
+    }
+    cnt = fDeviceLayerStrings->count();
+    SkDebugf("\nDevice Layers: ");
+    for (int i = 0; i < cnt; ++i) {
+        SkDebugf("%s%s", (*fDeviceLayerStrings)[i].c_str(), (i < cnt - 1) ? sep : "");
+    }
+}