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;;; guile-2d
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Font rendering.
;;
;;; Code:
(define-module (2d font)
#:use-module (srfi srfi-9)
#:use-module (system foreign)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module ((sdl ttf) #:prefix SDL:)
#:use-module (gl)
#:use-module (gl contrib packed-struct)
#:use-module (2d color)
#:use-module (2d config)
#:use-module (2d shader)
#:use-module (2d signal)
#:use-module (2d texture)
#:use-module (2d vector2)
#:use-module (2d window)
#:use-module (2d wrappers gl)
#:export (enable-fonts
load-font
load-default-font
font?
font-point-size
make-label
label?
label-font
label-text
label-position
label-color
draw-label))
;;;
;;; Font
;;;
(define font-shader #f)
(define (enable-fonts)
(SDL:ttf-init)
(set! font-shader
(make-shader-program
(load-vertex-shader
(string-append %pkgdatadir
"/shaders/font-vertex.glsl"))
(load-fragment-shader
(string-append %pkgdatadir
"/shaders/font-fragment.glsl")))))
(define-record-type <font>
(make-font ttf point-size)
font?
(ttf font-ttf)
(point-size font-point-size))
(define (load-font filename point-size)
"Load the TTF font in FILENAME with the given POINT-SIZE."
(if (file-exists? filename)
(make-font (SDL:load-font filename point-size) point-size)
(error "File not found!" filename)))
(define* (load-default-font #:optional (point-size 12))
"Load the guile-2d default TTF font. POINT-SIZE is an optional
argument with a default value of 12."
(load-font (string-append %pkgdatadir "/fonts/DejaVuSans.ttf") point-size))
(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)))
(with-gl-bind-texture (texture-target texture-2d) texture-id
(gl-texture-parameter (texture-target texture-2d)
(texture-parameter-name texture-min-filter)
(texture-min-filter nearest))
(gl-texture-parameter (texture-target texture-2d)
(texture-parameter-name texture-mag-filter)
(texture-mag-filter nearest))
(gl-texture-image-2d (texture-target texture-2d)
0
(pixel-format rgba)
(SDL:surface:w surface)
(SDL:surface:h surface)
0
(version-1-2 bgra)
(color-pointer-type unsigned-byte)
pixels))
(make-texture texture-id #f
(SDL:surface:w surface)
(SDL:surface:h surface)
0 0 1 1)))
(define-record-type <label>
(%make-label font text position anchor color texture vertices)
label?
(font label-font)
(text label-text)
(position label-position)
(anchor label-anchor)
(color label-color)
(texture label-texture)
(vertices label-vertices))
(define (make-label-vertices texture)
"Return a packed array of vertices for TEXTURE."
(let ((vertices (make-packed-array texture-vertex 4)))
(pack-texture-vertices vertices 0
(texture-width texture)
(texture-height texture)
(texture-s1 texture)
(texture-t1 texture)
(texture-s2 texture)
(texture-t2 texture))
vertices))
(define* (make-label font text position #:optional #:key
(color white) (anchor 'top-left))
"Return a new label containing the string TEXT rendered with FONT at
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))
(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)))
*unspecified*)
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