Added clip_to_screen_space() to utils.hpp

Forgot to add in earlier commit - this should fix compile error.
Also added cv:: in Rasterizer to fix second compile error

include/eos/render/Rasterizer.hpp

@@ -45,7 +45,7 @@ public:
     {
         colorbuffer = cv::Mat(viewport_height, viewport_width, CV_8UC4, cv::Scalar::all(255));
         depthbuffer =
-            std::numeric_limits<double>::max() * Mat::ones(viewport_height, viewport_width, CV_64FC1);
+            std::numeric_limits<double>::max() * cv::Mat::ones(viewport_height, viewport_width, CV_64FC1);
     };
 
     /**

include/eos/render/utils.hpp

@@ -84,6 +84,14 @@ inline cv::Vec2f screen_to_clip_space(const cv::Vec2f& screen_coordinates, int s
 	return cv::Vec2f(x_cs, y_cs);
 };
 
+template<typename T, glm::precision P = glm::defaultp>
+glm::tvec2<T, P> clip_to_screen_space(const T clip_coord_x, const T clip_coord_y, int screen_width, int screen_height) {
+	// Todo: See/copy notes from utils.hpp/clip_to_screen_space.
+	const T x_ss = (clip_coord_x + T(1)) * (screen_width / 2.0);
+	const T y_ss = screen_height - (clip_coord_y + T(1)) * (screen_height / 2.0); // also flip y; Qt: Origin top-left. OpenGL: bottom-left.
+	return glm::tvec2<T, P>(x_ss, y_ss);
+};
+
 /**
  * Calculates the normal of a face (or triangle), i.e. the
  * per-face normal. Return normal will be normalised.