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-rw-r--r--2d/font.scm26
1 files changed, 15 insertions, 11 deletions
diff --git a/2d/font.scm b/2d/font.scm
index 5cdc9cf..a9e178f 100644
--- a/2d/font.scm
+++ b/2d/font.scm
@@ -22,6 +22,7 @@
;;; Code:
(define-module (2d font)
+ #:use-module (srfi srfi-2)
#:use-module (srfi srfi-9)
#:use-module (system foreign)
#:use-module ((sdl sdl) #:prefix SDL:)
@@ -85,10 +86,12 @@ argument with a default value of 12."
(define (render-text font text)
"Return a new texture with TEXT rendered using FONT."
- (let* ((surface (SDL:render-utf8 (font-ttf font) text
- (SDL:make-color 255 255 255) #t))
- (pixels (SDL:surface-pixels surface))
- (texture-id (gl-generate-texture)))
+ ;; An empty string will result in a surface value of #f, in which we
+ ;; want to abort the texture creation process.
+ (and-let* ((surface (SDL:render-utf8 (font-ttf font) text
+ (SDL:make-color 255 255 255) #t))
+ (pixels (SDL:surface-pixels surface))
+ (texture-id (gl-generate-texture)))
(with-gl-bind-texture (texture-target texture-2d) texture-id
(gl-texture-parameter (texture-target texture-2d)
(texture-parameter-name texture-min-filter)
@@ -139,16 +142,17 @@ argument with a default value of 12."
the given position. Optional arguments are COLOR with a default of
white and ANCHOR with a default of 'top-left."
(let* ((texture (render-text font text))
- (vertices (make-label-vertices texture))
+ (vertices (and texture (make-label-vertices texture)))
(anchor (anchor-texture texture anchor)))
(%make-label font text position anchor color texture vertices)))
(define (draw-label label)
"Draw LABEL on the screen."
- (with-shader-program font-shader
- (uniforms ((projection (signal-ref window-projection))
- (position (label-position label))
- (anchor (label-anchor label))
- (color (label-color label)))
- (draw-texture-vertices (label-texture label) (label-vertices label) 1)))
+ (when (label-texture label)
+ (with-shader-program font-shader
+ (uniforms ((projection (signal-ref window-projection))
+ (position (label-position label))
+ (anchor (label-anchor label))
+ (color (label-color label)))
+ (draw-texture-vertices (label-texture label) (label-vertices label) 1))))
*unspecified*)