render: shapes: Add docstring to draw-line.

* chickadee/render/shapes.scm (draw-line): Add docstring.

1 files changed, 6 insertions, 0 deletions

diff --git a/chickadee/render/shapes.scm b/chickadee/render/shapes.scm
index 6981807..fe0df72 100644
--- a/chickadee/render/shapes.scm
+++ b/chickadee/render/shapes.scm
@@ -131,6 +131,12 @@ void main (void) {
                     (cap 'round)
                     (color white)
                     (shader (force default-shader)))
+      "Draw a line segment from START to END. The line will be
+THICKNESS pixels thick with an antialiased border FEATHER pixels wide.
+The line will be colored COLOR. CAP specifies the type of end cap that
+should be used to terminate the lines, either 'none', 'butt',
+'square', 'round', 'triangle-in', or 'triangle-out'.  Advanced users
+may use SHADER to override the built-in line segment shader."
       (let* ((x1 (vec2-x start))
              (y1 (vec2-y start))
              (x2 (vec2-x end))