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;;; 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-sdl-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"))))
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