1 files changed, 53 insertions, 0 deletions
diff --git a/src/mbgl/programs/collision_box_program.hpp b/src/mbgl/programs/collision_box_program.hpp
new file mode 100644
index 0000000000..66b1284621
--- /dev/null
+++ b/src/mbgl/programs/collision_box_program.hpp
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <mbgl/programs/program.hpp>
+#include <mbgl/programs/attributes.hpp>
+#include <mbgl/programs/uniforms.hpp>
+#include <mbgl/shader/collision_box.hpp>
+#include <mbgl/util/geometry.hpp>
+
+#include <cmath>
+
+namespace mbgl {
+
+namespace uniforms {
+MBGL_DEFINE_UNIFORM_SCALAR(float, u_scale);
+MBGL_DEFINE_UNIFORM_SCALAR(float, u_maxzoom);
+} // namespace uniforms
+
+class CollisionBoxProgram : public Program<
+    shaders::collision_box,
+    gl::Attributes<
+        attributes::a_pos,
+        attributes::a_extrude,
+        attributes::a_data<2>>,
+    gl::Uniforms<
+        uniforms::u_matrix,
+        uniforms::u_scale,
+        uniforms::u_zoom,
+        uniforms::u_maxzoom>>
+{
+public:
+    using Program::Program;
+
+    static Vertex vertex(Point<float> a, Point<float> o, float maxzoom, float placementZoom) {
+        return Vertex {
+            {
+                static_cast<int16_t>(a.x),
+                static_cast<int16_t>(a.y)
+            },
+            {
+                static_cast<int16_t>(::round(o.x)),
+                static_cast<int16_t>(::round(o.y))
+            },
+            {
+                static_cast<uint8_t>(maxzoom * 10),
+                static_cast<uint8_t>(placementZoom * 10)
+            }
+        };
+    }
+};
+
+using CollisionBoxVertex = CollisionBoxProgram::Vertex;
+
+} // namespace mbgl