[core] Render fill-extrusion layers (#8431)

6 files changed, 38 insertions, 102 deletions

diff --git a/src/mbgl/util/indexed_tuple.hpp b/src/mbgl/util/indexed_tuple.hpp
deleted file mode 100644
index a414639530..0000000000
--- a/src/mbgl/util/indexed_tuple.hpp
+++ /dev/null
@@ -1,56 +0,0 @@
-#pragma once
-
-#include <mbgl/util/type_list.hpp>
-
-#include <type_traits>
-#include <tuple>
-
-namespace mbgl {
-
-template <class T, class... Ts>
-struct TypeIndex;
-
-template <class T, class... Ts>
-struct TypeIndex<T, T, Ts...> : std::integral_constant<std::size_t, 0> {};
-
-template <class T, class U, class... Ts>
-struct TypeIndex<T, U, Ts...> : std::integral_constant<std::size_t, 1 + TypeIndex<T, Ts...>::value> {};
-
-template <class...> class IndexedTuple;
-
-// A tuple of Ts, where individual members can be accessed via `t.get<I>()` for I ∈ Is.
-//
-// See https://github.com/mapbox/cpp/blob/master/C%2B%2B%20Structural%20Metaprogramming.md
-// for motivation.
-//
-template <class... Is, class... Ts>
-class IndexedTuple<TypeList<Is...>, TypeList<Ts...>> : public std::tuple<Ts...> {
-public:
-    static_assert(sizeof...(Is) == sizeof...(Ts), "IndexedTuple size mismatch");
-
-    using std::tuple<Ts...>::tuple;
-
-    template <class I>
-    static constexpr std::size_t Index = TypeIndex<I, Is...>::value;
-
-    template <class I>
-    auto& get() {
-        return std::get<Index<I>>(*this);
-    }
-
-    template <class I>
-    const auto& get() const {
-        return std::get<Index<I>>(*this);
-    }
-
-    template <class... Js, class... Us>
-    IndexedTuple<TypeList<Is..., Js...>, TypeList<Ts..., Us...>>
-    concat(const IndexedTuple<TypeList<Js...>, TypeList<Us...>>& other) const {
-        return IndexedTuple<TypeList<Is..., Js...>, TypeList<Ts..., Us...>> {
-            get<Is>()...,
-            other.template get<Js>()...
-        };
-    }
-};
-
-} // namespace mbgl
diff --git a/src/mbgl/util/mat3.cpp b/src/mbgl/util/mat3.cpp
index e2200867ce..107be81985 100644
--- a/src/mbgl/util/mat3.cpp
+++ b/src/mbgl/util/mat3.cpp
@@ -25,8 +25,9 @@
 #include <cmath>
 
 namespace mbgl {
+namespace matrix {
 
-void matrix::identity(mat3& out) {
+void identity(mat3& out) {
     out[0] = 1.0f;
     out[1] = 0.0f;
     out[2] = 0.0f;
@@ -38,7 +39,7 @@ void matrix::identity(mat3& out) {
     out[8] = 1.0f;
 }
 
-void matrix::translate(mat3& out, const mat3& a, double x, double y) {
+void translate(mat3& out, const mat3& a, double x, double y) {
     double a00 = a[0], a01 = a[1], a02 = a[2],
           a10 = a[3], a11 = a[4], a12 = a[5],
           a20 = a[6], a21 = a[7], a22 = a[8];
@@ -56,7 +57,7 @@ void matrix::translate(mat3& out, const mat3& a, double x, double y) {
     out[8] = x * a02 + y * a12 + a22;
 }
 
-void matrix::rotate(mat3& out, const mat3& a, double rad) {
+void rotate(mat3& out, const mat3& a, double rad) {
     double s = std::sin(rad),
           c = std::cos(rad),
           a00 = a[0],
@@ -82,7 +83,7 @@ void matrix::rotate(mat3& out, const mat3& a, double rad) {
     out[8] = a22;
 }
 
-void matrix::scale(mat3& out, const mat3& a, double x, double y) {
+void scale(mat3& out, const mat3& a, double x, double y) {
     out[0] = x * a[0];
     out[1] = x * a[1];
     out[2] = x * a[2];
@@ -94,4 +95,11 @@ void matrix::scale(mat3& out, const mat3& a, double x, double y) {
     out[8] = a[8];
 }
 
+void transformMat3f(vec3f& out, const vec3f& a, const mat3& m) {
+    out[0] = m[0] * a[0] + m[3] * a[1] + m[6] * a[2];
+    out[1] = m[1] * a[0] + m[4] * a[1] + m[7] * a[2];
+    out[2] = m[2] * a[0] + m[5] * a[1] + m[8] * a[2];
+}
+
+} // namespace matrix
 } // namespace mbgl
diff --git a/src/mbgl/util/mat3.hpp b/src/mbgl/util/mat3.hpp
index ca4955fe5f..c4203c940b 100644
--- a/src/mbgl/util/mat3.hpp
+++ b/src/mbgl/util/mat3.hpp
@@ -26,7 +26,9 @@
 
 namespace mbgl {
 
-typedef std::array<double, 9> mat3;
+using vec3 = std::array<double, 3>;
+using vec3f = std::array<float, 3>;
+using mat3 = std::array<double, 9>;
 
 namespace matrix {
 
@@ -35,5 +37,7 @@ void translate(mat3& out, const mat3& a, double x, double y);
 void rotate(mat3& out, const mat3& a, double rad);
 void scale(mat3& out, const mat3& a, double x, double y);
 
+void transformMat3f(vec3f& out, const vec3f& a, const mat3& m);
+
 } // namespace matrix
 } // namespace mbgl
diff --git a/src/mbgl/util/offscreen_texture.cpp b/src/mbgl/util/offscreen_texture.cpp
index 56ef60b15c..e719ac566e 100644
--- a/src/mbgl/util/offscreen_texture.cpp
+++ b/src/mbgl/util/offscreen_texture.cpp
@@ -14,12 +14,13 @@ public:
 
     void bind() {
         if (!framebuffer) {
-            texture = context.createTexture(size);
+            texture = context.createTexture(size, gl::TextureFormat::RGBA);
             framebuffer = context.createFramebuffer(*texture);
         } else {
             context.bindFramebuffer = framebuffer->framebuffer;
         }
 
+        context.activeTexture = 0;
         context.viewport = { 0, 0, size };
     }
 
@@ -36,6 +37,20 @@ public:
         return size;
     }
 
+    void bindRenderbuffers(gl::TextureUnit unit) {
+        if (!framebuffer) {
+            texture = context.createTexture(size, gl::TextureFormat::RGBA, unit);
+            gl::Renderbuffer<gl::RenderbufferType::DepthComponent> depthTarget = context.createRenderbuffer<gl::RenderbufferType::DepthComponent>(size);
+            framebuffer = context.createFramebuffer(*texture, depthTarget);
+
+        } else {
+            context.bindFramebuffer = framebuffer->framebuffer;
+        }
+
+        context.activeTexture = unit;
+        context.viewport = { 0, 0, size };
+    }
+
 private:
     gl::Context& context;
     const Size size;
@@ -66,4 +81,8 @@ const Size& OffscreenTexture::getSize() const {
     return impl->getSize();
 }
 
+void OffscreenTexture::bindRenderbuffers(gl::TextureUnit unit) {
+    impl->bindRenderbuffers(unit);
+}
+
 } // namespace mbgl
diff --git a/src/mbgl/util/offscreen_texture.hpp b/src/mbgl/util/offscreen_texture.hpp
index b8bfabf7d3..4e9e936114 100644
--- a/src/mbgl/util/offscreen_texture.hpp
+++ b/src/mbgl/util/offscreen_texture.hpp
@@ -16,6 +16,7 @@ public:
     ~OffscreenTexture();
 
     void bind() override;
+    void bindRenderbuffers(gl::TextureUnit unit = 0);
 
     PremultipliedImage readStillImage();
 
diff --git a/src/mbgl/util/type_list.hpp b/src/mbgl/util/type_list.hpp
deleted file mode 100644
index 4a5e95c8a4..0000000000
--- a/src/mbgl/util/type_list.hpp
+++ /dev/null
@@ -1,40 +0,0 @@
-#pragma once
-
-#include <type_traits>
-#include <tuple>
-
-namespace mbgl {
-
-template <class...>
-class TypeList {};
-
-namespace detail {
-
-template <class, class>
-struct TypeCons;
-
-template <class T, class... Ts>
-struct TypeCons<T, TypeList<Ts...>> {
-    using Type = TypeList<T, Ts...>;
-};
-
-template <class, template <class> class>
-struct TypeFilter;
-
-template <template <class> class Predicate>
-struct TypeFilter<TypeList<>, Predicate> {
-    using Type = TypeList<>;
-};
-
-template <template <class> class Predicate, class T, class... Ts>
-struct TypeFilter<TypeList<T, Ts...>, Predicate> {
-    using Tail = typename TypeFilter<TypeList<Ts...>, Predicate>::Type;
-    using Type = std::conditional_t<Predicate<T>::value, typename TypeCons<T, Tail>::Type, Tail>;
-};
-
-} // namespace detail
-
-template <class TypeList, template <class> class Predicate>
-using FilteredTypeList = typename detail::TypeFilter<TypeList, Predicate>::Type;
-
-} // namespace mbgl