Faster Preview View (#15884)

Co-authored-by: Kris Austin <kris.austin@gmail.com>

src/libvgcode/include/Types.hpp

@@ -37,6 +37,8 @@ static constexpr float MAX_WIPES_RADIUS_MM = 1.0f;
 // Used for positions, displacements and so on.
 //
 using Vec3 = std::array<float, 3>;
+// ORCA: the per vertex data uploaded as GL_RGBA32F, see extract_pos_and_or_hwa().
+using Vec4 = std::array<float, 4>;
 
 //
 // 4x4 square matrix with elements in column-major order:

src/libvgcode/include/Viewer.hpp

@@ -80,6 +80,10 @@ public:
     // ORCA: section view. Cuts away where dot(plane, (x, y, z, 1)) < 0; { 0, 0, 0, 1 } keeps all.
     //
     void set_clipping_plane(const std::array<float, 4>& plane);
+    //
+    // ORCA: direction to the top light in eye space, shading the toolpaths and biasing their shadow lookup.
+    //
+    void set_light_top_dir(const Vec3& direction);
 
     //
     // ************************************************************************