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;;; Chickadee Game Toolkit
;;; Copyright © 2016 David Thompson <davet@gnu.org>
;;;
;;; Chickadee 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.
;;;
;;; Chickadee 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:
;;
;; High-level rendering API.
;;
;;; Code:
(define-module (chickadee render)
#:use-module (chickadee math matrix)
#:use-module (chickadee render gpu)
#:use-module (chickadee render blend)
#:use-module (chickadee render framebuffer)
#:use-module (chickadee render shader)
#:use-module (chickadee render texture)
#:use-module (chickadee render buffer)
#:use-module (chickadee render viewport)
#:use-module (srfi srfi-9)
#:export (current-viewport
current-framebuffer
current-blend-mode
current-depth-test
current-texture
current-projection
with-viewport
with-framebuffer
with-blend-mode
with-depth-test
with-texture
with-projection
clear-screen
gpu-apply
gpu-apply*
gpu-apply/instanced*
gpu-apply/instanced))
(define-record-type <render-context>
(make-render-context viewport framebuffer blend-mode depth-test?
projection textures)
render-context?
(viewport render-context-viewport set-render-context-viewport!)
(framebuffer render-context-framebuffer set-render-context-framebuffer!)
(blend-mode render-context-blend-mode set-render-context-blend-mode!)
(depth-test? render-context-depth-test? set-render-context-depth-test!)
(projection render-context-projection set-render-context-projection!)
(textures render-context-textures))
(define render-context
(make-render-context null-viewport
null-framebuffer
'replace
#f
(make-identity-matrix4)
(make-vector 32 null-texture)))
(define (current-viewport)
(render-context-viewport render-context))
(define (current-framebuffer)
(render-context-framebuffer render-context))
(define (current-blend-mode)
(render-context-blend-mode render-context))
(define (current-depth-test)
(render-context-depth-test? render-context))
(define (current-texture i)
(vector-ref (render-context-textures render-context) i))
(define (current-projection)
(render-context-projection render-context))
(define-syntax-rule (with (getter setter value) body ...)
(let ((prev (getter render-context)))
(setter render-context value)
body ...
(setter render-context prev)))
(define-syntax-rule (with-viewport viewport body ...)
(with (render-context-viewport set-render-context-viewport! viewport)
body ...))
(define (clear-screen)
(let ((viewport (current-viewport)))
(set-gpu-viewport! (current-gpu) viewport)
(clear-viewport viewport)))
(define-syntax-rule (with-framebuffer framebuffer body ...)
(with (render-context-framebuffer set-render-context-framebuffer! framebuffer)
;; 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-viewport (framebuffer-viewport framebuffer)
(with-projection (framebuffer-projection framebuffer)
body ...))))
(define-syntax-rule (with-blend-mode blend-mode body ...)
(with (render-context-blend-mode set-render-context-blend-mode! blend-mode)
body ...))
(define-syntax-rule (with-depth-test depth-test body ...)
(with (render-context-depth-test? set-render-context-depth-test! depth-test)
body ...))
(define-syntax-rule (with-texture n texture body ...)
(let* ((textures (render-context-textures render-context))
(prev (vector-ref textures n)))
(dynamic-wind
(lambda () (vector-set! textures n texture))
(lambda () body ...)
(lambda () (vector-set! textures n prev)))))
(define-syntax-rule (with-projection matrix body ...)
(with (render-context-projection set-render-context-projection! matrix)
body ...))
(define (keyword->string kw)
(symbol->string (keyword->symbol kw)))
(define-syntax uniform-apply
(lambda (x)
(syntax-case x ()
((_ shader ()) (datum->syntax x #t))
((_ shader (name value . rest))
(with-syntax ((sname (datum->syntax x (keyword->symbol
(syntax->datum #'name)))))
#'(begin
(shader-uniform-set! shader 'sname value)
(uniform-apply shader rest)))))))
(define-syntax-rule (gpu-prepare shader vertex-array uniforms)
(let ((gpu (current-gpu)))
;; It's important that the framebuffer is set before setting the
;; viewport because applying a new viewport will clear the current
;; framebuffer.
(set-gpu-framebuffer! gpu (current-framebuffer))
(set-gpu-viewport! gpu (current-viewport))
(set-gpu-blend-mode! gpu (current-blend-mode))
(set-gpu-depth-test! gpu (current-depth-test))
(set-gpu-shader! gpu shader)
(let loop ((i 0))
(when (< i 32)
(set-gpu-texture! gpu i (current-texture i))
(loop (1+ i))))
(uniform-apply shader uniforms)
;; Sampler2D values aren't explicitly passed as uniform values via
;; gpu-apply, so we have to bind them to the proper texture units
;; behind the scenes.
(shader-uniform-for-each
(lambda (uniform)
(when (eq? (uniform-type uniform) sampler-2d)
(set-uniform-value! shader uniform (uniform-value uniform))))
shader)))
(define-syntax-rule (gpu-apply* shader vertex-array count . uniforms)
(begin
(gpu-prepare shader vertex-array uniforms)
(render-vertices vertex-array count)))
(define-syntax-rule (gpu-apply shader vertex-array uniforms ...)
(gpu-apply* shader vertex-array #f uniforms ...))
(define-syntax-rule (gpu-apply/instanced* shader vertex-array count instances .
uniforms)
(begin
(gpu-prepare shader vertex-array uniforms)
(render-vertices/instanced vertex-array instances count)))
(define-syntax-rule (gpu-apply/instanced shader vertex-array instances
uniforms ...)
(gpu-apply/instanced* shader vertex-array #f instances uniforms ...))
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