blob: 8c34d6043aee89780b4037c4859c7c4080e4583d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
;;; guile-sdl2 --- FFI bindings for SDL2
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; This file is part of guile-sdl2.
;;;
;;; Guile-sdl2 is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-sdl2 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 Lesser General Public
;;; License along with guile-sdl2. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; SDL 2D accelerated rendering.
;;
;;; Code:
(define-module (sdl2 render)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (system foreign)
#:use-module (sdl2)
#:use-module ((sdl2 bindings) #:prefix ffi:)
#:export (make-renderer
renderer?
delete-renderer!
call-with-renderer
clear-renderer
present-renderer
render-copy
surface->texture))
;;;
;;; Renderer
;;;
(define-wrapped-pointer-type <renderer>
renderer?
wrap-renderer unwrap-renderer
(lambda (context port)
(format port "#<renderer ~x>"
(pointer-address (unwrap-renderer context)))))
(define (renderer-flags->bitmask flags)
(apply logior
(map (match-lambda
('software ffi:SDL_RENDERER_SOFTWARE)
('accelerated ffi:SDL_RENDERER_ACCELERATED)
('vsync ffi:SDL_RENDERER_PRESENTVSYNC)
('texture ffi:SDL_RENDERER_TARGETTEXTURE))
flags)))
(define* (make-renderer window #:optional (flags '(accelerated vsync)))
"Return a new renderer for WINDOW created with the options specified
in FLAGS, a list of symbols. The valid symbols that may appear in
FLAGS are:
* software, to use a software renderer fallback
* accelerated, to use hardware acceleration
* vsync, to synchronize rendering with the monitor's refresh rate
* texture, for render to texture support"
(let ((ptr (ffi:sdl-create-renderer ((@@ (sdl2 video) unwrap-window)
window)
-1 ; pick driver automatically
(renderer-flags->bitmask flags))))
(if (null-pointer? ptr)
(sdl-error "make-renderer" "failed to create renderer")
(wrap-renderer ptr))))
(define (delete-renderer! renderer)
"Delete the rendering context RENDERER."
(ffi:sdl-destroy-renderer (unwrap-renderer renderer)))
(define (call-with-renderer renderer proc)
"Call PROC, passing it RENDERER and closing RENDERER upon exit of
PROC."
(dynamic-wind
(const #t)
(lambda ()
(proc renderer))
(lambda ()
(delete-renderer! renderer))))
(define (clear-renderer renderer)
"Clear the rendering target RENDERER with the current drawing
color."
(unless (zero? (ffi:sdl-render-clear (unwrap-renderer renderer)))
(sdl-error "clear-renderer!" "failed to clear renderer")))
(define (present-renderer renderer)
"Display RENDERER."
(ffi:sdl-render-present (unwrap-renderer renderer)))
;;;
;;; Texture
;;;
(define-wrapped-pointer-type <texture>
texture?
wrap-texture unwrap-texture
(lambda (context port)
(format port "#<texture ~x>"
(pointer-address (unwrap-texture context)))))
(define (surface->texture renderer surface)
"Convert SURFACE to a texture suitable for RENDERER."
(let ((ptr (ffi:sdl-create-texture-from-surface
(unwrap-renderer renderer)
((@@ (sdl2 surface) unwrap-surface) surface))))
(if (null-pointer? ptr)
(sdl-error "surface->texture" "failed to convert surface to texture")
(wrap-texture ptr))))
;; TODO: Add srcrect and dstrect.
(define (render-copy renderer texture)
"Copy TEXTURE to the rendering target of RENDERER."
(let ((result (ffi:sdl-render-copy (unwrap-renderer renderer)
(unwrap-texture texture)
%null-pointer
%null-pointer)))
(unless (zero? result)
(sdl-error "render-copy" "failed to copy texture"))))
|
