[documentation] Updated README and DEVELOPING

To reflect changes in the buildsystem.

3 files changed, 27 insertions, 211 deletions

diff --git a/DEVELOPING.md b/DEVELOPING.md
index d865a35d2d..3dea887120 100644
--- a/DEVELOPING.md
+++ b/DEVELOPING.md
@@ -1,168 +1,11 @@
-# Modern C++ support
+# Developing
 
-Mapbox GL Native supports the C++14 standard, and encourages contributions to
-the source code using modern C++ idioms like return type deductions, generic
-lambdas, `std::optional` and alike. However, we do not support all the features
-from the final draft of the C++14 standard - we had to sacrifice support for
-these features in order to support GCC from version 4.9 onwards.
+This is been rewritten to include:
 
-The following C++14 features are **not supported** in Mapbox GL Native:
-
-## [C++14 variable templates](https://isocpp.org/wiki/faq/cpp14-language#variable-templates)
-
-Constructs like the example below are not supported:
-
-```C++
-template<typename T> constexpr T pi = T(3.14);
-```
-
-### Workarounds:
-
-- If the variable is an alias, use the call the alias points to: [example](https://github.com/mapbox/mapbox-gl-native/commit/f1ac757bd28351fd57113a1e16f6c2e00ab193c1#diff-711ce10b54a522c948efc9030ffab4fcL269)
-```C++
-// auto foo = pi<double>;
-auto foo = double(3.14);
-```
-
-- Replace variable templates with either functions or structs: [example 1](https://github.com/mapbox/mapbox-gl-native/commit/f1ac757bd28351fd57113a1e16f6c2e00ab193c1#diff-ffbe6cdfd30513aaa4749b4d959a5da6L58), [example 2](https://github.com/mapbox/mapbox-gl-native/commit/f1ac757bd28351fd57113a1e16f6c2e00ab193c1#diff-04af54dc8685cdc382ebe24466dc1d00L98)
-
-## [C++14 aggregates with non-static data member initializers](http://en.cppreference.com/w/cpp/language/aggregate_initialization)
-
-Constructs like the example below are not supported:
-
-```C++
-struct Foo {
-    int x = { 0 };
-};
-
-// error: no matching function for call to 'Foo::Foo(<brace-enclosed initializer list>)'
-int main() {
-    Foo foo { 0 };
-    return 0;
-}
-```
-
-### Workarounds
-- Replace data member initializers with default parameter values in default constructors:
-
-```C++
-struct Foo {
-    Foo(int x_ = 0) : x(x_) {}
-    int x;
-};
-
-int main() {
-    Foo foo { 0 }; // works with default constructor
-    return 0;
-}
-```
-
-- Replace bracket initialization with regular round brackets or none:
-
-```C++
-struct Foo {
-    Foo(int x_ = 0) : x(x_) {}
-    int x;
-};
-
-int main() {
-    Foo foo(); // works
-    Foo bar; // also works
-    return 0;
-}
-```
-
-## [Extended `constexpr` support](https://isocpp.org/wiki/faq/cpp14-language#extended-constexpr)
-
-GCC 4.9 strictly forbids `constexpr` usage in the following scenarios:
-- No local variable declarations (not `static` or `thread_local`, and no uninitialized variables)
-- Cannot mutate objects whose lifetime began with the constant expression evaluation
-- Disable usage of if, switch, for, while, do-while (not goto) inside constexpr expressions
-- Enforces that constexpr member functions are implicitly const
-
-```C++
-// sorry, unimplemented: use of the value of the object being constructed
-// in a constant expression
-struct Foo {
-    int x, y;
-    constexpr Foo(int i) : x(i), y(x) {}
-};
-
-// error: body of constexpr function 'constexpr int test1(int)' not a
-// return-statement
-constexpr int test1(int i) {
-    int j = i;
-    return j;
-}
-
-// error: body of constexpr function 'constexpr bool test2(int)' not a
-// return-statement
-constexpr bool test2(int i) {
-    if (i > 0) {
-        return true;
-    } else {
-        return false;
-    }
-}
-```
-
-### Workarounds
-
-- Either remove `constexpr` specifier or replace it with `inline` in case of
-  functions
-
-
-## [Polymorphic lambdas](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68278)
-
-GCC 5.2.0 crashes with polymorphic lambdas and this version of the compiler
-is currently used in Qt Automotive. Luckily polymorphic lambdas are rarely
-used/needed but we had one incident fixed by #9665.
-
-### Workarounds
-
-- Copy & Paste™ the code.
-
-
-## [Inheriting Constructors](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm)
-
-Compilers with only partial C++11 support causes compilation errors when using-declaration is used in derived class to inherit its base class's constructors `(e.g. using Base::Base;)`.
-
-```C++
-#include <vector>
-
-template <typename T>
-struct Varargs : std::vector<T>
-{
-    using std::vector<T>::vector;
-};
-
-// error: conflicts with version inherited from 'std::__1::vector<int, std::__1::allocator<int> >'
-int main()
-{
-    Varargs<int> v;
-    return 0;
-}
-```
-
-### Workarounds
-
-- Replace using-declaration (e.g. using Base::Base;) in derived class with `universal forwarding constructor`.
-
-```C++
-#include <vector>
-
-template <typename T>
-struct Varargs : std::vector<T>
-{
-    template <class... Args>
-    Varargs(Args&&... args) : std::vector<T>(std::forward<Args>(args)...) {}
-};
-
-int main()
-{
-    Varargs<int> v;
-    return 0;
-}
-```
-
-Note: Using `universal forwarding constructor` may not be appropriate when derived class has additional members that are not in base class. Write constructors for the derived class explicitly instead of using `universal forwarding constructor` when the derived class has additional members.
+- How to build for the platforms we support.
+- Acceptance criteria for code contributions (style, static asserts)
+- How to run the unit tests.
+- How to run the benchmarks.
+- How to run the render tests.
+- How to rebaseline baselines metrics.
+- How to use GL Native as a 3rd party library in your project.
diff --git a/INSTALL.md b/INSTALL.md
deleted file mode 100644
index 463d199d10..0000000000
--- a/INSTALL.md
+++ /dev/null
@@ -1,15 +0,0 @@
-# Building & Developing from Source
-
-**Just trying to use one of the Mapbox Maps SDKs? You don't need to read this stuff! We
-provide [easy-to-install, prebuilt versions of the Mapbox Maps SDKs for iOS and Android
-that you can download instantly and get started with fast](https://www.mapbox.com/install/).**
-
-If you're certain you need to build from source, rather than using a prebuilt SDK, please
-refer to the installation instructions for the platform of interest:
-
-* [Mapbox Maps SDK for Android](platform/android/README.md)
-* [Mapbox Maps SDK for iOS](platform/ios/INSTALL.md)
-* [Mapbox Maps SDK for macOS](platform/macos/INSTALL.md)
-* [Mapbox Maps SDK for Qt](platform/qt/README.md)
-* [Mapbox GL Native on Linux](platform/linux/README.md)
-* [node-mapbox-gl-native](platform/node/DEVELOPING.md)
diff --git a/README.md b/README.md
index 482919c393..2a8344676a 100644
--- a/README.md
+++ b/README.md
@@ -1,42 +1,30 @@
 # Mapbox GL Native
 
+[![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) [![Coverage Status](https://codecov.io/gh/mapbox/mapbox-gl-native/branch/master/graph/badge.svg)](https://codecov.io/gh/mapbox/mapbox-gl-native)
+
 A library for embedding interactive, customizable vector maps into native applications on multiple platforms. It
 takes stylesheets that conform to the [Mapbox Style Specification](https://github.com/mapbox/mapbox-gl-style-spec/),
 applies them to vector tiles that conform to the [Mapbox Vector Tile Specification](https://github.com/mapbox/vector-tile-spec),
-and renders them using OpenGL. [Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) is the WebGL-based counterpart,
+and renders them using OpenGL or Metal. [Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) is the WebGL-based counterpart,
 designed for use on the Web.
 
-| SDK                                                 | Languages                          | Build status                             |
-| --------------------------------------------------- | ---------------------------------- | ---------------------------------------- |
-| Mapbox GL Native Core                               | C++14                              | [![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) [![Coverage Status](https://codecov.io/gh/mapbox/mapbox-gl-native/branch/master/graph/badge.svg)](https://codecov.io/gh/mapbox/mapbox-gl-native) |
-| [Mapbox Maps SDK for Android](../platform/android/) | Java                               | [![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) |
-| [Mapbox Maps SDK for iOS](../platform/ios/)         | Objective-C or Swift               | [![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) |
-| [Mapbox Maps SDK for macOS](../platform/macos/)     | Objective-C, Swift, or AppleScript | [![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) |
-| [node-mapbox-gl-native](../platform/node/)          | Node.js                            | [![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) |
-| [Mapbox Maps SDK for Qt](../platform/qt)            | C++03                              | [![Circle CI build status](https://circleci.com/gh/mapbox/mapbox-gl-native.svg?style=shield)](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) [![AppVeyor CI build status](https://ci.appveyor.com/api/projects/status/3q12kbcooc6df8uc?svg=true)](https://ci.appveyor.com/project/Mapbox/mapbox-gl-native) |
-
-[Additional Mapbox GL Native–based libraries](https://wiki.openstreetmap.org/wiki/Mapbox_GL#Libraries) for **hybrid applications** are developed outside of this repository. If your platform or hybrid application framework isn’t listed there, consider embedding [Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) using the standard Web capabilities on your platform.
-
-## License
-
-Mapbox GL Native is licensed under the [3-Clause BSD license](../LICENSE.md).
+## [Developing](DEVELOPING.md)
 
-## Developing
+We use [CMake](https://cmake.org/cmake/help/latest/) to build Mapbox GL Native
+for various platforms, including Linux, Android, iOS, macOS and Windows. The
+following command, executed from the root of this repository tree, will build
+Mapbox GL Native targeting your host architecture given that you have all the
+dependencies installed and run the example app.
 
-The `next` directory contains the next generation buildsystem for Mapbox GL Native, based solely on CMake with the
-goal of minimizing the use of scripts, increase portability and support building Mapbox GL Native as a subdirectory
-of another CMake project. This new buildsystem is also designed to build offline, making use of pre-installed and
-vendorized dependencies. When using the build bot docker image, the build should produce the exact same results as
-the bots, making it a hermetically sealed build for Linux, Qt and Android.
+```
+$ git update submodules --init --recursive
+$ cmake . -B build
+$ cmake --build build
+$ MAPBOX_ACCESS_TOKEN=my_access_token_here ./build/platform/glfw/mbgl-glfw
+```
 
-### Building and running tests
+## License
 
-The following command, executed from the root of this repository tree, will build Mapbox GL Native targeting your
-host architecture given that you have all the dependencies installed.
+Mapbox GL Native is licensed under the [2-Clause BSD license](LICENSE.md). The licenses of its dependencies are tracked via [FOSSA](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmapbox%2Fmapbox-gl-native):
 
-```
-$ mkdir build && cd build
-$ cmake ..
-$ make -j8
-$ make test ARGS=-V
-```
+[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmapbox%2Fmapbox-gl-native.svg?type=large)](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmapbox%2Fmapbox-gl-native)