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authorDavid Thompson <dthompson2@worcester.edu>2015-12-13 15:34:33 -0500
committerDavid Thompson <dthompson2@worcester.edu>2015-12-13 22:50:05 -0500
commitd4824b20c811ae859541de72ac971b070cf9f9d2 (patch)
tree3c3634fd5fb955830dcf80d3622d7527eedccd5a /sdl2/render.scm
parente0c2201c2fb811b498eba347ea9389621d92226a (diff)
Add renderer bindings.
* sdl2/bindings.scm (SDL_RENDERER_SOFTWARE, SDL_RENDERER_ACCELERATED, SDL_RENDERER_PRESENTVSYNC, SDL_RENDERER_TARGETTEXTURE): New variables. (sdl-create-renderer, sdl-destroy-renderer, sdl-render-clear, sdl-render-present, sdl-render-copy, sdl-create-texture-from-surface): New procedures. * sdl2/render.scm: New file. * Makefile.am (SOURCES): Add it.
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diff --git a/sdl2/render.scm b/sdl2/render.scm
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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"))))