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;;; Sly
;;; Copyright (C) 2014 David Thompson <davet@gnu.org>
;;;
;;; Sly 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.
;;;
;;; Sly 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:
;;
;; Manages the OpenGL state machine.
;;
;;; Code:
(define-module (sly render)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
#:use-module (ice-9 q)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-42)
#:use-module (gl)
#:use-module (gl enums)
#:use-module (gl low-level)
#:use-module (sly wrappers gl)
#:use-module (sly math transform)
#:use-module (sly render shader)
#:use-module (sly render texture)
#:use-module (sly render utils)
#:use-module (sly render mesh)
#:use-module (sly render framebuffer)
#:use-module (sly render camera)
#:export (make-graphics
graphics?
graphics-blend-mode
set-graphics-blend-mode!
graphics-depth-test?
set-graphics-depth-test!
graphics-texture
set-graphics-texture!
graphics-shader
set-graphics-shader!
graphics-mesh
set-graphics-mesh!
graphics-framebuffer
set-graphics-framebuffer!
graphics-viewport
set-graphics-viewport!
graphics-model-view-transform
graphics-model-view-mul!
graphics-model-view-identity!
with-model-view-excursion
graphics-projection-transform
graphics-projection-mul!
graphics-projection-identity!
with-projection-excursion
with-graphics
with-graphics-excursion))
;;;
;;; Transformation matrix stack.
;;;
(define (make-null-transform)
(make-transform 0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0))
(define (make-transform-stack size)
(let ((stack (make-q)))
(do-ec (: i size) (q-push! stack (make-null-transform)))
stack))
(define (copy-transform! src dest)
(bytevector-copy! (transform-matrix src) 0
(transform-matrix dest) 0
64))
(define (call-with-transform-excursion stack thunk)
(let ((t (q-pop! stack)))
(dynamic-wind
(const #t)
(lambda ()
(copy-transform! t (q-front stack))
(thunk))
(lambda ()
(q-push! stack t)))))
(define (stack-transform-mul! stack t)
(let ((dest (q-front stack)))
(call-with-transform-excursion stack
(lambda ()
(transform*! dest (q-front stack) t)))))
(define (stack-transform-identity! stack)
(copy-transform! identity-transform (q-front stack)))
;;;
;;; Graphics context.
;;;
(define-record-type <graphics>
(%make-graphics blend-mode depth-test? texture shader
mesh framebuffer viewport projection model-view)
graphics?
(blend-mode graphics-blend-mode %set-graphics-blend-mode!)
(depth-test? graphics-depth-test? %set-graphics-depth-test!)
(texture graphics-texture %set-graphics-texture!)
(shader graphics-shader %set-graphics-shader!)
(mesh graphics-mesh %set-graphics-mesh!)
(framebuffer graphics-framebuffer %set-graphics-framebuffer!)
(viewport graphics-viewport %set-graphics-viewport!)
(projection graphics-projection)
(model-view graphics-model-view))
(define (make-context-switcher getter setter switch)
(lambda* (gfx x #:optional force)
(when (or force (not (equal? (getter gfx) x)))
(setter gfx x)
(switch x))))
(define set-graphics-blend-mode!
(make-context-switcher graphics-blend-mode
%set-graphics-blend-mode!
apply-blend-mode))
(define set-graphics-depth-test!
(make-context-switcher graphics-depth-test?
%set-graphics-depth-test!
apply-depth-test))
(define set-graphics-texture!
(make-context-switcher graphics-texture
%set-graphics-texture!
apply-texture))
(define set-graphics-shader!
(make-context-switcher graphics-shader
%set-graphics-shader!
apply-shader-program))
(define set-graphics-mesh!
(make-context-switcher graphics-mesh
%set-graphics-mesh!
apply-mesh))
(define set-graphics-framebuffer!
(make-context-switcher graphics-framebuffer
%set-graphics-framebuffer!
apply-framebuffer))
(define set-graphics-viewport!
(make-context-switcher graphics-viewport
%set-graphics-viewport!
apply-viewport))
(define* (make-graphics #:optional (transform-stack-size 32))
(%make-graphics #f #f #f #f #f #f #f
(make-transform-stack transform-stack-size)
(make-transform-stack transform-stack-size)))
(define (graphics-reset! gfx)
(set-graphics-blend-mode! gfx #f #t)
(set-graphics-depth-test! gfx #f #t)
(set-graphics-texture! gfx null-texture #t)
(set-graphics-shader! gfx null-shader-program #t)
(set-graphics-mesh! gfx null-mesh #t)
(set-graphics-framebuffer! gfx null-framebuffer #t)
(set-graphics-viewport! gfx null-viewport #t)
(stack-transform-identity! (graphics-projection gfx))
(stack-transform-identity! (graphics-model-view gfx)))
(define-syntax-rule (with-graphics gfx body ...)
(begin
(graphics-reset! gfx)
body ...
(graphics-reset! gfx)))
(define (graphics-model-view-transform gfx)
(q-front (graphics-model-view gfx)))
(define (graphics-model-view-mul! gfx t)
(stack-transform-mul! (graphics-model-view gfx) t))
(define (graphics-model-view-identity! gfx)
(stack-transform-identity! (graphics-model-view gfx)))
;; emacs: (put 'with-model-view-excursion 'scheme-indent-function 1)
(define-syntax-rule (with-model-view-excursion gfx body ...)
(call-with-transform-excursion (graphics-model-view gfx)
(lambda () body ...)))
(define (graphics-projection-transform gfx)
(q-front (graphics-projection gfx)))
(define (graphics-projection-mul! gfx t)
(stack-transform-mul! (graphics-projection gfx) t))
(define (graphics-projection-identity! gfx)
(stack-transform-identity! (graphics-projection gfx)))
;; emacs: (put 'with-projection-excursion 'scheme-indent-function 1)
(define-syntax-rule (with-projection-excursion gfx body ...)
(call-with-transform-excursion (graphics-projection gfx)
(lambda () body ...)))
(define-syntax-rule (with-graphics-excursion gfx body ...)
(match gfx
(($ <graphics> blend-mode depth-test? texture shader mesh
viewport framebuffer _ _)
body ...
(set-graphics-blend-mode! gfx blend-mode)
(set-graphics-depth-test! gfx depth-test?)
(set-graphics-texture! gfx texture)
(set-graphics-shader! gfx shader)
(set-graphics-mesh! gfx mesh)
(set-graphics-framebuffer! gfx framebuffer)
(set-graphics-viewport! gfx viewport))))
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