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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)
#: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
gpu-apply
gpu-apply*
gpu-apply/instanced*
gpu-apply/instanced))
(define *current-viewport* null-viewport)
(define *current-framebuffer* null-framebuffer)
(define *current-blend-mode* 'replace)
(define *current-depth-test* #f)
(define *current-projection* (make-identity-matrix4))
(define *current-textures* (make-vector 32 null-texture))
(define (current-viewport)
*current-viewport*)
(define (current-framebuffer)
*current-framebuffer*)
(define (current-blend-mode)
*current-blend-mode*)
(define (current-depth-test)
*current-depth-test*)
(define (current-texture i)
(vector-ref *current-textures* i))
(define (current-projection)
*current-projection*)
(define-syntax-rule (with (name value) body ...)
(let ((prev name))
(dynamic-wind
(lambda () (set! name value))
(lambda () body ...)
(lambda () (set! name prev)))))
(define-syntax-rule (with-viewport viewport body ...)
(with (*current-viewport* viewport) body ...))
(define-syntax-rule (with-framebuffer framebuffer body ...)
(with (*current-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 (*current-blend-mode* blend-mode) body ...))
(define-syntax-rule (with-depth-test depth-test body ...)
(with (*current-depth-test* depth-test) body ...))
(define-syntax-rule (with-texture n texture body ...)
(let ((prev (vector-ref *current-textures* n)))
(dynamic-wind
(lambda () (vector-set! *current-textures* n texture))
(lambda () body ...)
(lambda () (vector-set! *current-textures* n prev)))))
(define-syntax-rule (with-shader shader body ...)
(with (*current-shader* shader)
(initialize-uniforms)
body ...))
(define-syntax-rule (with-vertex-array vertex-array body ...)
(with (*current-vertex-array* vertex-array) body ...))
(define-syntax-rule (with-projection matrix body ...)
(with (*current-projection* matrix) body ...))
;; (define (initialize-uniforms)
;; (hash-for-each (lambda (name uniform)
;; (unless (hash-get-handle *current-uniforms* name)
;; (hash-set! *current-uniforms* name
;; (uniform-default-value uniform))))
;; (shader-uniforms *current-shader*)))
;; (define-syntax uniform-let
;; (syntax-rules ()
;; ((_ () body ...) (begin body ...))
;; ((_ ((name value) . rest) body ...)
;; (let ((uniform (shader-uniform (current-shader) name))
;; (prev (hash-ref *current-uniforms* name)))
;; (if uniform
;; (dynamic-wind
;; (lambda ()
;; (hash-set! *current-uniforms* name value))
;; (lambda ()
;; (uniform-let rest body ...))
;; (lambda ()
;; (hash-set! *current-uniforms* name prev)))
;; (error "no such uniform: " name))))))
;; (define (uniform-ref name)
;; (uniform-value (shader-uniform (current-shader) name)))
(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->string
(syntax->datum #'name)))))
#'(begin
(set-uniform-value! (shader-uniform shader sname) value)
(uniform-apply shader rest)))))))
(define-syntax-rule (gpu-prepare shader vertex-array uniforms)
(begin
;; It's important that the framebuffer is set before setting the
;; viewport because applying a new viewport will clear the current
;; framebuffer.
(gpu-state-set! *framebuffer-state* (current-framebuffer))
(gpu-state-set! *viewport-state* (current-viewport))
(gpu-state-set! *blend-mode-state* (current-blend-mode))
(gpu-state-set! *depth-test-state* (current-depth-test))
(gpu-state-set! *shader-state* shader)
(let loop ((i 0))
(when (< i 32)
(texture-set! i (current-texture i))
(loop (1+ i))))
(uniform-apply shader uniforms)
(hash-for-each (lambda (name uniform)
(when (eq? 'sampler-2d (uniform-type uniform))
(set-uniform-value! uniform (uniform-value uniform))))
(shader-uniforms 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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