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;;; Chickadee Game Toolkit
;;; Copyright © 2017, 2021 David Thompson <dthompson2@worcester.edu>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;
;; Render to texture.
;;
;;; Code:
(define-module (chickadee graphics framebuffer)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:use-module (system foreign)
#:use-module (chickadee math matrix)
#:use-module (chickadee graphics color)
#:use-module (chickadee graphics engine)
#:use-module (chickadee graphics gpu)
#:use-module (chickadee graphics pixbuf)
#:use-module ((chickadee graphics texture) #:select (make-texture null-texture))
#:use-module (chickadee graphics viewport)
#:export (make-framebuffer
framebuffer?
framebuffer-texture
framebuffer-viewport
framebuffer-projection
null-framebuffer
current-framebuffer
with-framebuffer))
(define-record-type <framebuffer>
(%make-framebuffer id renderbuffer-id texture viewport projection)
framebuffer?
(id framebuffer-id)
(renderbuffer-id framebuffer-renderbuffer-id)
(texture framebuffer-texture)
(viewport framebuffer-viewport)
(projection framebuffer-projection))
(define null-framebuffer
(%make-framebuffer 0 0 null-texture null-viewport (make-identity-matrix4)))
(define %clear-color (transparency 0.0))
(define* (make-framebuffer width height #:key (min-filter 'linear) (mag-filter 'linear)
(wrap-s 'repeat) (wrap-t 'repeat))
"Create a new framebuffer that renders to a texture with
dimensions WIDTH x HEIGHT."
(assert-current-graphics-engine)
(let* ((gpu (current-gpu))
(framebuffer-id (fresh-gpu-framebuffer gpu))
(renderbuffer-id (fresh-gpu-renderbuffer gpu))
(texture (make-texture width height
#:min-filter min-filter
#:mag-filter mag-filter
#:wrap-s wrap-s
#:wrap-t wrap-t))
(texture-id ((@@ (chickadee graphics texture) texture-id)
texture))
;; It is convenient to make a default viewport and
;; projection matrix for the framebuffer so that the
;; rendering engine can set it whenever it changes to
;; this framebuffer, saving users the trouble of having
;; to this tedious task themselves.
(viewport (make-viewport 0 0 width height #:clear-color %clear-color))
(projection (orthographic-projection 0 width height 0 0 1))
(framebuffer (%make-framebuffer framebuffer-id
renderbuffer-id
texture
viewport
projection)))
(gpu-framebuffer-init gpu framebuffer-id renderbuffer-id texture-id
width height)
framebuffer))
(define-syntax-rule (with-framebuffer framebuffer body ...)
;; As a convenience, initialize the viewport and projection matrix
;; as well so that the user doesn't have to explicitly make a
;; viewport and/or projection matrix unless they actually want to do
;; fancy viewport manipulations.
(with-graphics-state ((framebuffer (framebuffer-id framebuffer))
(projection (framebuffer-projection framebuffer)))
(with-viewport (framebuffer-viewport framebuffer)
(clear-viewport)
body ...)))
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