diff --git a/.gitignore b/.gitignore
index 2ee38036f8..d8774d5225 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,9 @@
 # Created by http://www.gitignore.io
 
+### OSX ###
+.vscode
+.vs
+
 ### OSX ###
 .DS_Store
 .AppleDouble
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b07485080..60c8571fe9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.2)
+cmake_minimum_required(VERSION 3.15)
 
 project(tangram)
 
@@ -18,11 +18,6 @@ option(TANGRAM_DEV_MODE "For developers only: Don't omit the frame pointer" OFF)
 
 message(STATUS "Build type configuration: ${CMAKE_BUILD_TYPE}")
 
-# Check that submodules are present.
-if(NOT EXISTS "${PROJECT_SOURCE_DIR}/core/deps/harfbuzz-icu-freetype/harfbuzz/README")
-  message(SEND_ERROR "Missing submodules - Please run:\n 'git submodule update --init'")
-  return()
-endif()
 
 if(CMAKE_BUILD_TYPE MATCHES Debug)
   add_definitions(-DDEBUG)
diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 4075f8ca8f..e673300181 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -1,6 +1,7 @@
 project(tangram-core)
 
 # Build core library dependencies.
+find_package(yaml-cpp CONFIG REQUIRED)
 add_subdirectory(deps)
 
 add_library(tangram-core
@@ -231,7 +232,6 @@ target_link_libraries(tangram-core
   alfons
   double-conversion
   miniz
-  z
 )
 
 # Add JavaScript implementation.
@@ -260,6 +260,7 @@ if(UNIX AND NOT APPLE)
   target_link_libraries(tangram-core PRIVATE dl)
 endif()
 
+target_compile_definitions(tangram-core PUBLIC _USE_MATH_DEFINES)
 if(TANGRAM_WARN_ON_RULE_CONFLICT)
   target_compile_definitions(tangram-core
     PRIVATE
diff --git a/core/deps/CMakeLists.txt b/core/deps/CMakeLists.txt
index 4de4f69315..32061c21e6 100644
--- a/core/deps/CMakeLists.txt
+++ b/core/deps/CMakeLists.txt
@@ -11,15 +11,15 @@ add_library(glm INTERFACE)
 target_include_directories(glm INTERFACE glm)
 target_compile_definitions(glm INTERFACE GLM_FORCE_CTOR_INIT)
 
-## yaml-cpp ##
-##############
-set(YAML_CPP_BUILD_TESTS OFF CACHE BOOL "")
-set(YAML_CPP_BUILD_TOOLS OFF CACHE BOOL "")
-set(YAML_CPP_BUILD_CONTRIB OFF CACHE BOOL "")
-set(YAML_CPP_INSTALL OFF CACHE BOOL "")
-add_subdirectory(yaml-cpp)
+### yaml-cpp ##
+###############
+#set(YAML_CPP_BUILD_TESTS OFF CACHE BOOL "")
+#set(YAML_CPP_BUILD_TOOLS OFF CACHE BOOL "")
+#set(YAML_CPP_BUILD_CONTRIB OFF CACHE BOOL "")
+#set(YAML_CPP_INSTALL OFF CACHE BOOL "")
+#add_subdirectory(yaml-cpp)
 
-target_include_directories(yaml-cpp PUBLIC yaml-cpp/include)
+#target_include_directories(yaml-cpp PUBLIC yaml-cpp/include)
 
 ## css-color-parser-cpp ##
 ##########################
@@ -48,14 +48,10 @@ target_include_directories(miniz
 if(NOT TANGRAM_USE_SYSTEM_FONT_LIBS)
   ## Harfbuzz - ICU-Common - Freetype2 ##
   #######################################
-  set(HARFBUZZ_BUILD_ICU ON CACHE BOOL "Enable building of ICU")
-  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/harfbuzz-icu-freetype)
-
-  message(STATUS "harfbuzz" ${HARFBUZZ_LIBRARIES})
-
+  #find_package(ICU REQUIRED COMPONENTS common)
+  find_package(harfbuzz CONFIG REQUIRED)
   set(ALFONS_DEPS_LIBRARIES
-    ${ALFONS_DEPS_LIBRARIES}
-    harfbuzz ${HARFBUZZ_LIBRARIES}
+    harfbuzz::harfbuzz
     CACHE INTERNAL "alfons-libs" FORCE)
 endif()
 
diff --git a/core/deps/pbf/pbf.hpp b/core/deps/pbf/pbf.hpp
index f73b4f4056..62d4bc8871 100644
--- a/core/deps/pbf/pbf.hpp
+++ b/core/deps/pbf/pbf.hpp
@@ -26,9 +26,13 @@
 #endif
 
 namespace protobuf {
-
+#if defined(__GNUC__)
 #define FORCEINLINE inline __attribute__((always_inline))
 #define NOINLINE __attribute__((noinline))
+#else
+#define FORCEINLINE inline
+#define NOINLINE 
+#endif
 #define PBF_INLINE FORCEINLINE
 
 class message {
diff --git a/core/include/tangram/log.h b/core/include/tangram/log.h
index eb594e791a..c5d6041278 100644
--- a/core/include/tangram/log.h
+++ b/core/include/tangram/log.h
@@ -27,7 +27,11 @@ static constexpr const char * past_last_slash(const char * const str) {
     return past_last_slash(str, str);
 }
 
+#ifdef TANGRAM_WINDOWS
+#define __FILENAME__ __FILE__
+#else
 #define __FILENAME__ ({constexpr const char * const sf__ {past_last_slash(__FILE__)}; sf__;})
+#endif
 
 #define TANGRAM_MAX_BUFFER_LOG_SIZE 99999
 
diff --git a/core/include/tangram/tile/tileID.h b/core/include/tangram/tile/tileID.h
index 57107daa0c..327a458cfa 100644
--- a/core/include/tangram/tile/tileID.h
+++ b/core/include/tangram/tile/tileID.h
@@ -3,6 +3,7 @@
 #include <cassert>
 #include <cstdint>
 #include <string>
+#include <algorithm>
 
 /* An immutable identifier for a map tile
  *
diff --git a/core/include/tangram/util/variant.h b/core/include/tangram/util/variant.h
index 87998a45c3..f0512a91b1 100644
--- a/core/include/tangram/util/variant.h
+++ b/core/include/tangram/util/variant.h
@@ -55,7 +55,15 @@ using Value = variant<none_type, double, std::string>;
 
 class Value : public detail::Value {
     using Base = detail::Value;
-    using Base::Base;
+
+public:
+    Value(): Base() {}
+
+    template<typename T>
+    Value(const T& val): Base(val) {}
+
+    template<typename T>
+    Value(T&& val): Base(val) {}
 };
 
 const static Value NOT_A_VALUE(none_type{});
diff --git a/core/src/data/rasterSource.cpp b/core/src/data/rasterSource.cpp
index 689e9e31f5..32ef27a2eb 100644
--- a/core/src/data/rasterSource.cpp
+++ b/core/src/data/rasterSource.cpp
@@ -208,7 +208,7 @@ std::shared_ptr<Texture> RasterSource::cacheTexture(const TileID& _tileId, std::
     }
 
     texture = std::shared_ptr<Texture>(_texture.release(),
-                                       [c = std::weak_ptr<Cache>(m_textures), id](auto t) {
+                                       [c = std::weak_ptr<Cache>(m_textures), id](auto* t) {
                                            if (auto cache = c.lock()) {
                                                cache->erase(id);
                                                LOGD("%d - remove %s", cache->size(), id.toString().c_str());
diff --git a/core/src/debug/textDisplay.cpp b/core/src/debug/textDisplay.cpp
index 5b3166ee30..fff2af7105 100644
--- a/core/src/debug/textDisplay.cpp
+++ b/core/src/debug/textDisplay.cpp
@@ -89,7 +89,7 @@ void TextDisplay::draw(RenderState& rs, const std::string& _text, int _posx, int
     std::vector<glm::vec2> vertices;
     int nquads;
 
-    nquads = stb_easy_font_print(_posx, _posy, _text.c_str(), NULL, m_vertexBuffer, VERTEX_BUFFER_SIZE);
+    nquads = stb_easy_font_print(_posx, _posy, const_cast<char*>(_text.c_str()), NULL, m_vertexBuffer, VERTEX_BUFFER_SIZE);
 
     float* data = reinterpret_cast<float*>(m_vertexBuffer);
 
diff --git a/core/src/gl/framebuffer.cpp b/core/src/gl/framebuffer.cpp
index a8886e198d..ff71db6809 100644
--- a/core/src/gl/framebuffer.cpp
+++ b/core/src/gl/framebuffer.cpp
@@ -147,7 +147,7 @@ void FrameBuffer::init(RenderState& _rs) {
     }
 
     GLenum status = GL::checkFramebufferStatus(GL_FRAMEBUFFER);
-    GL_CHECK();
+    GL_CHECK("");
 
     if (status != GL_FRAMEBUFFER_COMPLETE) {
         LOGE("Framebuffer status is incomplete:");
diff --git a/core/src/scene/importer.cpp b/core/src/scene/importer.cpp
index 54d0dd9b82..fc1f211701 100644
--- a/core/src/scene/importer.cpp
+++ b/core/src/scene/importer.cpp
@@ -188,7 +188,11 @@ void Importer::addSceneYaml(const Url& sceneUrl, const char* sceneYaml, size_t l
     auto& sceneNode = m_sceneNodes[sceneUrl];
 
     try {
+#ifdef TANGRAM_WINDOWS
+        sceneNode.yaml = YAML::Load(sceneYaml);
+#else
         sceneNode.yaml = YAML::Load(sceneYaml, length);
+#endif
     } catch (const YAML::ParserException& e) {
         LOGE("Parsing scene config '%s'", e.what());
         return;
diff --git a/core/src/scene/sceneLoader.cpp b/core/src/scene/sceneLoader.cpp
index 2866edd93d..0f271971f9 100644
--- a/core/src/scene/sceneLoader.cpp
+++ b/core/src/scene/sceneLoader.cpp
@@ -145,7 +145,7 @@ void SceneLoader::applyScene(const Node& _node, Color& backgroundColor,
                              Stops& backgroundStops, Scene::animate& animated) {
     if (!_node) { return; }
     if (!_node.IsMap()) {
-        LOGNode("Invalid 'scene' section", _node);
+        LOGNode("Invalid 'scene' section", _node, "");
         return;
     }
 
@@ -302,7 +302,7 @@ Scene::Lights SceneLoader::applyLights(const Node& _node) {
             }
         }
     } else if (_node) {
-        LOGNode("Invalid 'lights'", _node);
+        LOGNode("Invalid 'lights'", _node, "");
     }
 
     if (lights.empty()) {
@@ -436,14 +436,14 @@ void SceneLoader::parseLightPosition(const Node& _positionNode, PointLight& _lig
         }
         _light.setPosition(positionResult);
     } else {
-        LOGNode("Invalid light position parameter:", _positionNode);
+        LOGNode("Invalid light position parameter:", _positionNode, "");
     }
 }
 
 void SceneLoader::applyTextures(const Node& _node, SceneTextures& _textures) {
     if (!_node) { return; }
     if (!_node.IsMap()) {
-        LOGNode("Invalid 'textures' section", _node);
+        LOGNode("Invalid 'textures' section", _node, "");
         return;
     }
 
@@ -543,7 +543,7 @@ bool SceneLoader::parseTexFiltering(const Node& _filteringNode, TextureOptions&
 void SceneLoader::applyFonts(const Node& _node, SceneFonts& _fonts) {
     if (!_node) { return; }
     if (!_node.IsMap()) {
-        LOGNode("Invalid 'fonts' section", _node);
+        LOGNode("Invalid 'fonts' section", _node, "");
         return;
     }
 
@@ -570,7 +570,7 @@ void SceneLoader::applyFonts(const Node& _node, SceneFonts& _fonts) {
 void SceneLoader::loadFontDescription(const Node& _node, const std::string& _family, SceneFonts& _fonts) {
     if (!_node) { return; }
     if (!_node.IsMap()) {
-        LOGNode("Invalid 'font' section", _node);
+        LOGNode("Invalid 'font' section", _node, "");
         return;
     }
 
@@ -634,18 +634,18 @@ Scene::TileSources SceneLoader::applySources(const Node& _config, const SceneOpt
 
         if (const Node& rasters = source.second["rasters"]) {
             if (!rasters.IsSequence()) {
-                LOGNode("Invalid 'rasters'", rasters);
+                LOGNode("Invalid 'rasters'", rasters, "");
                 continue;
             }
             for (const auto& raster : rasters) {
                 if (!raster.IsScalar()) {
-                    LOGNode("Invalid 'raster'", raster);
+                    LOGNode("Invalid 'raster'", raster, "");
                     continue;
                 }
                 if (auto rasterSource = getTileSource(raster.Scalar())) {
                     tileSource->addRasterSource(rasterSource);
                 } else {
-                    LOGNode("Missing raster source", raster);
+                    LOGNode("Missing raster source", raster, "");
                 }
             }
         }
@@ -676,7 +676,7 @@ Scene::TileSources SceneLoader::applySources(const Node& _config, const SceneOpt
             if (!data_source) { continue;}
 
             if (!data_source.IsScalar()) {
-                LOGNode("Invalid 'source", data);
+                LOGNode("Invalid 'source", data, "");
                 continue;
             }
             auto source = data_source.Scalar();
@@ -875,7 +875,7 @@ Scene::Styles SceneLoader::applyStyles(const Node& _node, SceneTextures& _textur
 
     if (!_node) { return styles; }
     if (!_node.IsMap()) {
-        LOGNode("Invalid 'styles' section", _node);
+        LOGNode("Invalid 'styles' section", _node, "");
         return styles;
     }
 
@@ -1256,7 +1256,7 @@ void SceneLoader::loadShaderConfig(const Node& _shaders, Style& _style, SceneTex
 
                 _style.styleUniforms().emplace_back(name, styleUniform.value);
             } else {
-                LOGNode("Style uniform parsing failure", uniform.second);
+                LOGNode("Style uniform parsing failure", uniform.second, "");
             }
         }
     }
@@ -1387,7 +1387,7 @@ void SceneLoader::loadMaterial(const Node& _matNode, Material& _material, Style&
             // Handled as texture
             break;
         default:
-            LOGNode("Invalid 'material'", prop);
+            LOGNode("Invalid 'material'", prop, "");
             break;
         }
         return glm::vec4(0.0);
@@ -1441,7 +1441,7 @@ MaterialTexture SceneLoader::loadMaterialTexture(const Node& _matCompNode, Style
 
     Node textureNode = _matCompNode["texture"];
     if (!textureNode) {
-        LOGNode("Expected a 'texture' parameter", _matCompNode);
+        LOGNode("Expected a 'texture' parameter", _matCompNode, "");
 
         return MaterialTexture{};
     }
@@ -1501,7 +1501,7 @@ std::vector<DataLayer> SceneLoader::applyLayers(const Node& _node,  SceneFunctio
                                                 SceneStops& _stops, DrawRuleNames& _ruleNames) {
     if (!_node) { return {}; }
     if (!_node.IsMap()) {
-        LOGNode("Invalid 'layers' section", _node);
+        LOGNode("Invalid 'layers' section", _node, "");
         return {};
     }
 
diff --git a/core/src/scene/stops.cpp b/core/src/scene/stops.cpp
index d94895ab37..93e420cf3e 100644
--- a/core/src/scene/stops.cpp
+++ b/core/src/scene/stops.cpp
@@ -266,15 +266,16 @@ auto Stops::Numbers(const YAML::Node& node) -> Stops {
 auto Stops::evalExpFloat(float _key) const -> float {
     if (frames.empty()) { return 0; }
 
+    if (_key <= frames[0].key) {
+        return frames[0].value.get<float>();
+    }
+
     auto upper = nearestHigherFrame(_key);
     auto lower = upper - 1;
 
     if (upper == frames.end())  {
         return lower->value.get<float>();
     }
-    if (lower < frames.begin()) {
-        return upper->value.get<float>();
-    }
 
     if (upper->key <= _key) {
         return upper->value.get<float>();
@@ -294,15 +295,16 @@ auto Stops::evalExpFloat(float _key) const -> float {
 auto Stops::evalFloat(float _key) const -> float {
     if (frames.empty()) { return 0; }
 
+    if (_key <= frames[0].key) {
+        return frames[0].value.get<float>();
+    }
+
     auto upper = nearestHigherFrame(_key);
     auto lower = upper - 1;
 
     if (upper == frames.end()) {
         return lower->value.get<float>();
     }
-    if (lower < frames.begin()) {
-        return upper->value.get<float>();
-    }
 
     float lerp = (_key - lower->key) / (upper->key - lower->key);
 
@@ -312,14 +314,15 @@ auto Stops::evalFloat(float _key) const -> float {
 auto Stops::evalColor(float _key) const -> uint32_t {
     if (frames.empty()) { return 0; }
 
+    if (_key <= frames[0].key) {
+        return frames[0].value.get<Color>().abgr;
+    }
+
     auto upper = nearestHigherFrame(_key);
     auto lower = upper - 1;
     if (upper == frames.end())  {
         return lower->value.get<Color>().abgr;
     }
-    if (lower < frames.begin()) {
-        return upper->value.get<Color>().abgr;
-    }
 
     float lerp = (_key - lower->key) / (upper->key - lower->key);
 
@@ -329,15 +332,16 @@ auto Stops::evalColor(float _key) const -> uint32_t {
 auto Stops::evalExpVec2(float _key) const -> glm::vec2 {
     if (frames.empty()) { return glm::vec2{0.f}; }
 
+    if (_key <= frames[0].key) {
+        return frames[0].value.get<glm::vec2>();
+    }
+
     auto upper = nearestHigherFrame(_key);
     auto lower = upper - 1;
 
     if (upper == frames.end()) {
         return lower->value.get<glm::vec2>();
     }
-    if (lower < frames.begin()) {
-        return upper->value.get<glm::vec2>();
-    }
 
     double range = exp2(upper->key - lower->key) - 1.0;
     double pos = exp2(_key - lower->key) - 1.0;
@@ -349,21 +353,21 @@ auto Stops::evalExpVec2(float _key) const -> glm::vec2 {
 
     return glm::vec2(lowerVal.x * (1 - lerp) + upperVal.x * lerp,
                      lowerVal.y * (1 - lerp) + upperVal.y * lerp);
-
 }
 
 auto Stops::evalVec2(float _key) const -> glm::vec2 {
     if (frames.empty()) { return glm::vec2{0.f}; }
 
+    if (_key <= frames[0].key) {
+        return frames[0].value.get<glm::vec2>();
+    }
+
     auto upper = nearestHigherFrame(_key);
     auto lower = upper - 1;
 
     if (upper == frames.end()) {
         return lower->value.get<glm::vec2>();
     }
-    if (lower < frames.begin()) {
-        return upper->value.get<glm::vec2>();
-    }
 
     float lerp = (_key - lower->key) / (upper->key - lower->key);
 
@@ -379,15 +383,16 @@ auto Stops::evalSize(float _key, const glm::vec2& _cssSize) const -> glm::vec2 {
 
     if (frames.empty()) { return {NAN, NAN}; }
 
+    if (_key <= frames[0].key) {
+        return frames[0].value.get<StyleParam::SizeValue>().getSizePixels(_cssSize);
+    }
+
     auto upper = nearestHigherFrame(_key);
     auto lower = upper - 1;
 
     if (upper == frames.end()) {
         return lower->value.get<StyleParam::SizeValue>().getSizePixels(_cssSize);
     }
-    if (lower < frames.begin()) {
-        return upper->value.get<StyleParam::SizeValue>().getSizePixels(_cssSize);
-    }
 
     double range = exp2(upper->key - lower->key) - 1.0;
     double pos = exp2(_key - lower->key) - 1.0;
diff --git a/core/src/text/textUtil.cpp b/core/src/text/textUtil.cpp
index f1a2b76b57..8f89f18e8a 100644
--- a/core/src/text/textUtil.cpp
+++ b/core/src/text/textUtil.cpp
@@ -67,7 +67,7 @@ int TextWrapper::draw(alfons::TextBatch& _batch, float _maxWidth, const alfons::
                       TextLabelProperty::Align _alignment, float _lineSpacing,
                       alfons::LineMetrics& _layoutMetrics) {
     size_t shapeStart = 0;
-    glm::vec2 position;
+    glm::vec2 position{};
 
     for (auto wrap : m_lineWraps) {
         alfons::LineMetrics lineMetrics;
diff --git a/core/src/util/floatFormatter.h b/core/src/util/floatFormatter.h
index b6d3f0189f..9194947835 100644
--- a/core/src/util/floatFormatter.h
+++ b/core/src/util/floatFormatter.h
@@ -20,14 +20,14 @@ struct ff {
 
     static double stod(const std::string& _string) {
         int end = 0;
-        return stod(_string.data(), _string.size(), &end);
+        return stod(_string.data(), static_cast<int>(_string.size()), &end);
     }
 
     static float stof(const char* _string, int _length, int* _end);
 
     static float stof(const std::string& _string) {
         int end = 0;
-        return stof(_string.data(), _string.size(), &end);
+        return stof(_string.data(), static_cast<int>(_string.size()), &end);
     }
 
 };
diff --git a/core/src/util/geom.h b/core/src/util/geom.h
index 437f49d3d4..6bf4f6e354 100644
--- a/core/src/util/geom.h
+++ b/core/src/util/geom.h
@@ -72,7 +72,7 @@ float signedArea(InputIt begin, InputIt end) {
     float area = 0;
     auto prev = end - 1;
     for (auto curr = begin; curr != end; ++curr) {
-        area += curr->x * prev->y - curr->y * prev->x;
+        area += static_cast<float>(curr->x * prev->y - curr->y * prev->x);
         prev = curr;
     }
     return 0.5f * area;
@@ -82,14 +82,14 @@ float signedArea(InputIt begin, InputIt end) {
 /// If the polygon has no area, the coordinates returned are NaN.
 template<class InputIt, class Vector = typename InputIt::value_type>
 Vector centroid(InputIt begin, InputIt end) {
-    Vector centroid;
+    Vector centroid{};
     float area = 0.f;
     const Vector offset(begin->x, begin->y);
 
     for (auto curr = begin, prev = end - 1; curr != end; prev = curr, ++curr) {
         const Vector prevPoint(prev->x - offset.x, prev->y - offset.y);
         const Vector currPoint(curr->x - offset.x, curr->y - offset.y);
-        float a = (prevPoint.x * currPoint.y - currPoint.x * prevPoint.y);
+        float a = static_cast<float>(prevPoint.x * currPoint.y - currPoint.x * prevPoint.y);
         centroid.x += (prevPoint.x + currPoint.x) * a;
         centroid.y += (prevPoint.y + currPoint.y) * a;
         area += a;
diff --git a/core/src/util/url.cpp b/core/src/util/url.cpp
index caa01c8193..d71b3fa806 100644
--- a/core/src/util/url.cpp
+++ b/core/src/util/url.cpp
@@ -2,6 +2,7 @@
 
 #include <cstdlib>
 #include <cassert>
+#include <algorithm>
 
 namespace Tangram {
 
diff --git a/platforms/common/glfwApp.cpp b/platforms/common/glfwApp.cpp
index 0c0c11eb5d..2bcdb5a2e2 100644
--- a/platforms/common/glfwApp.cpp
+++ b/platforms/common/glfwApp.cpp
@@ -3,6 +3,12 @@
 #include "imgui_impl_glfw.h"
 #include "imgui_impl_opengl3.h"
 #include "imgui_stl.h"
+
+#ifdef TANGRAM_WINDOWS
+#define GLFW_INCLUDE_NONE
+#include <glad/glad.h>
+#endif // TANGRAM_WINDOWS
+
 #define GLFW_INCLUDE_GLEXT
 #define GL_SILENCE_DEPRECATION
 #include <GLFW/glfw3.h>
@@ -203,6 +209,10 @@ void create(std::unique_ptr<Platform> p, int w, int h) {
     glfwMakeContextCurrent(main_window);
     glfwSwapInterval(1); // Enable vsync
 
+#ifdef TANGRAM_WINDOWS
+    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
+#endif
+
     // Set input callbacks
     glfwSetFramebufferSizeCallback(main_window, framebufferResizeCallback);
     glfwSetMouseButtonCallback(main_window, mouseButtonCallback);
@@ -535,17 +545,19 @@ void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods
                 map->loadSceneYamlAsync("{ scene: { background: { color: red } } }", std::string(""));
                 break;
             case GLFW_KEY_G:
-                static bool geoJSON = false;
-                if (!geoJSON) {
-                    loadSceneFile(false,
-                                  { SceneUpdate{"sources.osm.type", "GeoJSON"},
-                                    SceneUpdate{"sources.osm.url", "https://tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.json"}});
-                } else {
-                    loadSceneFile(false,
-                                  { SceneUpdate{"sources.osm.type", "MVT"},
-                                    SceneUpdate{"sources.osm.url", "https://tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.mvt"}});
+                {
+                    static bool geoJSON = false;
+                    if (!geoJSON) {
+                        loadSceneFile(false,
+                                      { SceneUpdate{"sources.osm.type", "GeoJSON"},
+                                        SceneUpdate{"sources.osm.url", "https://tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.json"}});
+                    } else {
+                        loadSceneFile(false,
+                                      { SceneUpdate{"sources.osm.type", "MVT"},
+                                        SceneUpdate{"sources.osm.url", "https://tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.mvt"}});
+                    }
+                    geoJSON = !geoJSON;
                 }
-                geoJSON = !geoJSON;
                 break;
             case GLFW_KEY_ESCAPE:
                 glfwSetWindowShouldClose(window, true);
@@ -603,7 +615,7 @@ void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods
             case GLFW_KEY_W:
                 map->onMemoryWarning();
                 break;
-        default:
+            default:
                 break;
         }
     }
diff --git a/platforms/common/platform_gl.cpp b/platforms/common/platform_gl.cpp
index de50335bf0..4756fa0580 100644
--- a/platforms/common/platform_gl.cpp
+++ b/platforms/common/platform_gl.cpp
@@ -11,7 +11,7 @@ GLenum GL::getError() {
 
 const GLubyte* GL::getString(GLenum name) {
     auto result = glGetString(name);
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 
@@ -86,12 +86,12 @@ void GL::deleteShader(GLuint shader) {
 }
 GLuint GL::createShader(GLenum type) {
     auto result = glCreateShader(type);
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 GLuint GL::createProgram() {
     auto result = glCreateProgram();
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 
@@ -117,12 +117,12 @@ void GL::getProgramInfoLog(GLuint program, GLsizei bufSize, GLsizei *length, GLc
 }
 GLint GL::getUniformLocation(GLuint program, const GLchar *name) {
     auto result = glGetUniformLocation(program, name);
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 GLint GL::getAttribLocation(GLuint program, const GLchar *name) {
     auto result = glGetAttribLocation(program, name);
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 void GL::getProgramiv(GLuint program, GLenum pname, GLint *params) {
@@ -263,12 +263,12 @@ void GL::uniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, co
 // mapbuffer
 void* GL::mapBuffer(GLenum target, GLenum access) {
     auto result =  glMapBuffer(target, access);
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 GLboolean GL::unmapBuffer(GLenum target) {
     auto result = glUnmapBuffer(target);
-    GL_CHECK();
+    GL_CHECK("");
     return result;
 }
 
@@ -329,7 +329,7 @@ void GL::deleteRenderbuffers(GLsizei n, const GLuint *renderbuffers) {
 
 GLenum GL::checkFramebufferStatus(GLenum target) {
     GLenum status = glCheckFramebufferStatus(target);
-    GL_CHECK();
+    GL_CHECK("");
     return status;
 }
 
diff --git a/platforms/common/platform_gl.h b/platforms/common/platform_gl.h
index 107396e3be..4fbed058b8 100644
--- a/platforms/common/platform_gl.h
+++ b/platforms/common/platform_gl.h
@@ -45,6 +45,15 @@ extern PFNGLGENVERTEXARRAYSOESPROC glGenVertexArraysOESEXT;
 #include <GLFW/glfw3.h>
 #endif // TANGRAM_LINUX
 
+#ifdef TANGRAM_WINDOWS
+#define GL_GLEXT_PROTOTYPES
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+// Resolve aliased names on Windows
+#define glClearDepthf glClearDepth
+#define glDepthRangef glDepthRange
+#endif // TANGRAM_WINDOWS
+
 #ifdef TANGRAM_RPI
 // Broadcom library for direct GPU access
 #include "bcm_host.h"
diff --git a/platforms/common/urlClient.cpp b/platforms/common/urlClient.cpp
index 07132dfd9c..aad7b8d953 100644
--- a/platforms/common/urlClient.cpp
+++ b/platforms/common/urlClient.cpp
@@ -4,7 +4,6 @@
 #include <cassert>
 #include <cstring>
 #include <curl/curl.h>
-#include <unistd.h>
 #include <time.h>
 
 constexpr char const* requestCancelledError = "Request cancelled";
@@ -22,6 +21,92 @@ struct CurlGlobals {
     }
 } s_curl;
 
+UrlClient::SelfPipe::~SelfPipe() {
+#if defined(_WIN32)
+    if(pipeFds[0] != SocketInvalid) {
+        closesocket(pipeFds[0]);
+    }
+    if(pipeFds[1] != SocketInvalid) {
+        closesocket(pipeFds[1]);
+    }
+#endif
+}
+
+bool  UrlClient::SelfPipe::initialize() {
+#if defined(_WIN32)
+    // https://stackoverflow.com/questions/3333361/how-to-cancel-waiting-in-select-on-windows
+    struct sockaddr_in inaddr;
+    int len = sizeof(inaddr);
+    memset(&inaddr, 0, len);
+    struct sockaddr addr;
+    memset(&addr, 0, sizeof(addr));
+
+    inaddr.sin_family = AF_INET;
+    inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+    inaddr.sin_port = 0;
+    int yes = 1;
+    SOCKET lst = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if(lst == INVALID_SOCKET) {
+        return false;
+    }
+    if(
+        setsockopt(lst, SOL_SOCKET, SO_REUSEADDR, (char*)&yes, sizeof(yes)) == SOCKET_ERROR ||
+        bind(lst, (struct sockaddr *)&inaddr, sizeof(inaddr)) == SOCKET_ERROR ||
+        listen(lst, 1) == SOCKET_ERROR ||
+        getsockname(lst, &addr, &len) ||
+        (pipeFds[0] = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET
+    ) {
+        closesocket(lst);
+        return false;
+    }
+
+    if(
+        (connect(pipeFds[0], &addr, len)) == SOCKET_ERROR ||
+        (pipeFds[1] = accept(lst, 0, 0)) == INVALID_SOCKET
+    ) {
+        closesocket(pipeFds[0]);
+        closesocket(lst);
+        pipeFds[0] = -1;
+        return false;
+    }
+
+    closesocket(lst);
+    return true;
+#else
+    return pipe(pipeFds) >= 0;
+#endif
+}
+
+bool UrlClient::SelfPipe::write() {
+#if defined(_WIN32)
+    return send(pipeFds[1], "\0", 1, 0) >= 0;
+#else
+    return write(pipeFds[1], "\0", 1) >= 0;
+#endif
+}
+
+bool UrlClient::SelfPipe::read(int *error) {
+    char buffer[1];
+#if defined(_WIN32)
+    int n = recv(pipeFds[0], buffer, sizeof(buffer), 0);
+    if(n == SOCKET_ERROR) {
+        *error = WSAGetLastError();
+        return false;
+    }
+#else
+    int n = read(pipeFds[0], buffer, sizeof(buffer));
+    if (n <= 0) {
+        *error = n;
+        return false;
+    }
+#endif
+    return true;
+}
+
+UrlClient::SelfPipe::Socket UrlClient::SelfPipe::getReadFd() {
+    return pipeFds[0];
+}
+
 struct UrlClient::Task {
     // Reduce Task content capacity when it's more than 128kb and last
     // content size was less then half limit_capacity.
@@ -63,6 +148,7 @@ struct UrlClient::Task {
         curl_easy_setopt(handle, CURLOPT_FOLLOWLOCATION, 1);
         curl_easy_setopt(handle, CURLOPT_MAXREDIRS, 20);
         curl_easy_setopt(handle, CURLOPT_TCP_NODELAY, 1);
+        curl_easy_setopt(handle, CURLOPT_USERAGENT, _options.userAgentString);
     }
 
     void setup() {
@@ -107,7 +193,7 @@ UrlClient::UrlClient(Options options) : m_options(options) {
 
     // Using a pipe to notify select() in curl-thread of new requests..
     // https://www.linuxquestions.org/questions/programming-9/exit-from-blocked-pselect-661200/
-    if (pipe(m_requestNotify) < 0) {
+    if (!m_requestNotify.initialize()) {
         LOGE("Could not initialize select breaker!");
     }
 }
@@ -154,7 +240,7 @@ UrlClient::~UrlClient() {
 void UrlClient::curlWakeUp() {
 
     if (!m_curlNotified) {
-        if (write(m_requestNotify[1], "\0", 1) <= 0) {
+        if (!m_requestNotify.write()) {
             // err
             return;
         }
@@ -292,7 +378,7 @@ void UrlClient::curlLoop() {
         }
 
         // Listen on requestNotify to break select when new requests are added.
-        FD_SET(m_requestNotify[0], &fdread);
+        FD_SET(m_requestNotify.getReadFd(), &fdread);
 
         // Wait for transfers
         // On success the value of maxfd is guaranteed to be >= -1. We call
@@ -306,11 +392,12 @@ void UrlClient::curlLoop() {
             continue;
 
         } else {
-            if (FD_ISSET(m_requestNotify[0], &fdread)) {
+            if (FD_ISSET(m_requestNotify.getReadFd(), &fdread)) {
                 // Clear notify fd
-                char buffer[1];
-                int n = read(m_requestNotify[0], buffer, sizeof(buffer));
-                if (n <= 0) { LOGE("Read request notify %d", n); }
+                int error;
+                if(!m_requestNotify.read(&error)) {
+                    LOGE("Read request notify %d", error);
+                }
                 //LOG("Got request notifies %d %d", n, m_curlNotified);
                 m_curlNotified = false;
             }
diff --git a/platforms/common/urlClient.h b/platforms/common/urlClient.h
index 965386faaa..faad84ecf5 100644
--- a/platforms/common/urlClient.h
+++ b/platforms/common/urlClient.h
@@ -13,6 +13,9 @@
 #include <thread>
 #include <vector>
 
+#if defined(_WIN32)
+#include <winsock2.h>
+#endif
 
 namespace Tangram {
 
@@ -24,6 +27,7 @@ class UrlClient {
         uint32_t maxActiveTasks = 20;
         uint32_t connectionTimeoutMs = 3000;
         uint32_t requestTimeoutMs = 30000;
+        const char* userAgentString = "tangram";
     };
 
     UrlClient(Options options);
@@ -43,6 +47,24 @@ class UrlClient {
         RequestId id;
     };
 
+    class SelfPipe {
+    public:
+#if defined(_WIN32)
+        using Socket = SOCKET;
+        const Socket SocketInvalid = INVALID_SOCKET;
+#else
+        using Socket = int;
+        const Socket SocketInvalid = -1;
+#endif
+        ~SelfPipe();
+        bool initialize();
+        bool write();
+        bool read(int *error);
+        Socket getReadFd();
+    private:
+        Socket pipeFds[2] = { SocketInvalid, SocketInvalid };
+    };
+
     struct Task;
 
     void curlLoop();
@@ -73,7 +95,7 @@ class UrlClient {
     std::atomic<uint64_t> m_requestCount{0};
 
     // File descriptors to break waiting select.
-    int m_requestNotify[2] = { -1, -1 };
+    SelfPipe m_requestNotify;
 };
 
 } // namespace Tangram
diff --git a/platforms/windows/config.cmake b/platforms/windows/config.cmake
new file mode 100644
index 0000000000..628634ac7e
--- /dev/null
+++ b/platforms/windows/config.cmake
@@ -0,0 +1,54 @@
+if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-gnu-zero-variadic-macro-arguments")
+endif()
+
+check_unsupported_compiler_version()
+
+add_definitions(-DTANGRAM_WINDOWS)
+
+find_package(OpenGL REQUIRED)
+find_package(CURL REQUIRED)
+
+include(cmake/glfw.cmake)
+
+add_executable(tangram
+  platforms/windows/src/windowsPlatform.cpp
+  platforms/windows/src/main.cpp
+  platforms/common/platform_gl.cpp
+  platforms/common/urlClient.cpp
+  platforms/common/glfwApp.cpp
+  platforms/common/imgui_impl_glfw.cpp
+  platforms/common/imgui_impl_opengl3.cpp
+  platforms/common/glfw/deps/glad.c
+)
+
+add_resources(tangram "${PROJECT_SOURCE_DIR}/scenes" "res")
+
+add_subdirectory(platforms/common/imgui)
+
+target_include_directories(tangram
+  PRIVATE
+  platforms/common
+  platforms/common/glfw/deps
+  ${CURL_INCLUDE_DIRS}
+)
+
+target_link_libraries(tangram
+  PRIVATE
+  tangram-core
+  glfw
+  imgui
+  ${GLFW_LIBRARIES}
+  ${OPENGL_LIBRARIES}
+  ${CURL_LIBRARIES}
+  -pthread
+  wsock32 ws2_32 crypt32 wldap32
+)
+
+#target_compile_options(tangram
+#  PRIVATE
+#  -std=c++14
+#)
+
+get_nextzen_api_key(NEXTZEN_API_KEY)
+target_compile_definitions(tangram PRIVATE NEXTZEN_API_KEY="${NEXTZEN_API_KEY}")
diff --git a/platforms/windows/src/main.cpp b/platforms/windows/src/main.cpp
new file mode 100644
index 0000000000..ad94df2e2d
--- /dev/null
+++ b/platforms/windows/src/main.cpp
@@ -0,0 +1,39 @@
+#include "glfwApp.h"
+#include "windowsPlatform.h"
+#include "log.h"
+#include "map.h"
+#include <memory>
+#include <direct.h> // _getcwd
+
+#define PATH_MAX 512
+
+using namespace Tangram;
+
+int main(int argc, char* argv[]) {
+
+    // Create the windowed app.
+    GlfwApp::create(std::make_unique<WindowsPlatform>(), 1024, 768);
+
+    GlfwApp::sceneFile = "res\\scene.yaml";
+    GlfwApp::parseArgs(argc, argv);
+
+    // Resolve the input path against the current directory.
+    Url baseUrl("file:///");
+    char pathBuffer[PATH_MAX] = {0};
+    if (getcwd(pathBuffer, PATH_MAX) != nullptr) {
+        baseUrl = baseUrl.resolve(Url("file://" + std::string(pathBuffer)));
+    }
+    
+    LOG("Base URL: %s", baseUrl.string().c_str());
+    
+    Url sceneUrl = baseUrl.resolve(Url(GlfwApp::sceneFile));
+    GlfwApp::sceneFile = sceneUrl.string();
+
+    // Loop until the user closes the window
+    GlfwApp::run();
+
+    // Clean up.
+    GlfwApp::destroy();
+
+    return 0;
+}
diff --git a/platforms/windows/src/windowsPlatform.cpp b/platforms/windows/src/windowsPlatform.cpp
new file mode 100644
index 0000000000..0b36fc932f
--- /dev/null
+++ b/platforms/windows/src/windowsPlatform.cpp
@@ -0,0 +1,77 @@
+#include "windowsPlatform.h"
+#include "gl/hardware.h"
+#include "log.h"
+#include <stdio.h>
+#include <stdarg.h>
+
+#include <GLFW/glfw3.h>
+
+#define DEFAULT "res/fonts/NotoSans-Regular.ttf"
+#define FONT_AR "res/fonts/NotoNaskh-Regular.ttf"
+#define FONT_HE "res/fonts/NotoSansHebrew-Regular.ttf"
+#define FONT_JA "res/fonts/DroidSansJapanese.ttf"
+#define FALLBACK "res/fonts/DroidSansFallback.ttf"
+
+namespace Tangram {
+
+void logMsg(const char* fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    vfprintf(stderr, fmt, args);
+    va_end(args);
+}
+
+WindowsPlatform::WindowsPlatform()
+    : WindowsPlatform(UrlClient::Options{}) {}
+
+WindowsPlatform::WindowsPlatform(UrlClient::Options urlClientOptions) :
+    m_urlClient(std::make_unique<UrlClient>(urlClientOptions)) {
+}
+
+WindowsPlatform::~WindowsPlatform() {}
+
+void WindowsPlatform::shutdown() {
+    // Stop all UrlWorker threads
+    m_urlClient.reset();
+
+    Platform::shutdown();
+}
+
+void WindowsPlatform::requestRender() const {
+    if (m_shutdown) { return; }
+    glfwPostEmptyEvent();
+}
+
+std::vector<FontSourceHandle> WindowsPlatform::systemFontFallbacksHandle() const {
+    std::vector<FontSourceHandle> handles;
+
+    handles.emplace_back(Url(DEFAULT));
+    handles.emplace_back(Url(FONT_AR));
+    handles.emplace_back(Url(FONT_HE));
+    handles.emplace_back(Url(FONT_JA));
+    handles.emplace_back(Url(FALLBACK));
+
+    return handles;
+}
+
+bool WindowsPlatform::startUrlRequestImpl(const Url& _url, const UrlRequestHandle _request, UrlRequestId& _id) {
+    auto onURLResponse = [this, _request](UrlResponse&& response) {
+        onUrlResponse(_request, std::move(response));
+    };
+    _id = m_urlClient->addRequest(_url.string(), onURLResponse);
+    return false;
+}
+
+void WindowsPlatform::cancelUrlRequestImpl(const UrlRequestId _id) {
+    if (m_urlClient) {
+        m_urlClient->cancelRequest(_id);
+    }
+}
+
+void setCurrentThreadPriority(int priority) {}
+
+void initGLExtensions() {
+    Tangram::Hardware::supportsMapBuffer = true;
+}
+
+} // namespace Tangram
diff --git a/platforms/windows/src/windowsPlatform.h b/platforms/windows/src/windowsPlatform.h
new file mode 100644
index 0000000000..ad7cd91066
--- /dev/null
+++ b/platforms/windows/src/windowsPlatform.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include "platform.h"
+#include "urlClient.h"
+
+namespace Tangram {
+
+class WindowsPlatform : public Platform {
+
+public:
+
+    WindowsPlatform();
+    explicit WindowsPlatform(UrlClient::Options urlClientOptions);
+    ~WindowsPlatform() override;
+    void shutdown() override;
+    void requestRender() const override;
+    std::vector<FontSourceHandle> systemFontFallbacksHandle() const override;
+    bool startUrlRequestImpl(const Url& _url, const UrlRequestHandle _request, UrlRequestId& _id) override;
+    void cancelUrlRequestImpl(const UrlRequestId _id) override;
+
+protected:
+    std::unique_ptr<UrlClient> m_urlClient;
+};
+
+} // namespace Tangram
diff --git a/vcpkg.json b/vcpkg.json
new file mode 100644
index 0000000000..19e50ab90e
--- /dev/null
+++ b/vcpkg.json
@@ -0,0 +1,30 @@
+{
+    "name": "tangram-es",
+    "version-string": "0.1.0",
+    "dependencies": [
+        {
+            "name":"curl",
+            "features":[
+                "ssl",
+                "http2"
+            ]
+        },
+        "glad",
+        "yaml-cpp",
+        "glfw3",
+        "benchmark",
+        {
+            "name": "harfbuzz",
+            "features": [
+                "icu",
+                "graphite2"
+            ]
+        },
+        {
+            "name": "imgui",
+            "features": [
+                "docking-experimental"
+            ]
+        }
+    ]
+}