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;;; Chickadee Game Toolkit
;;; Copyright © 2023 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.
;; CPS to GLSL emitter.
(define-module (chickadee graphics seagull glsl)
#:use-module (chickadee graphics seagull cps)
#:use-module (chickadee graphics seagull primitives)
#:use-module (chickadee graphics seagull types)
#:use-module (chickadee graphics seagull utils)
#:use-module (ice-9 match)
#:use-module (language cps intmap)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:export (emit-glsl))
(define (indent level port)
(unless (= level 0)
(display " " port)
(indent (- level 1) port)))
(define (variable-name id)
(format #f "v~a" id))
(define (emit-glsl* graph k exp level port)
(define (emit-exp exp var type)
(match (pk 'emit-exp exp)
(#f #f)
(($ <cps-constant> val _)
(indent level port)
(format port "~a ~a = ~a;\n"
(type-glsl-name type)
(variable-name var)
(match val
(#t "true")
(#f "false")
(_ val))))
(($ <cps-values> (arg))
(indent level port)
(format port "~a ~a = ~a;\n"
(type-glsl-name type)
(variable-name var)
(variable-name arg)))
(($ <cps-assignment> from to)
(indent level port)
(format port "~a = ~a;\n" (variable-name from) (variable-name to)))
(($ <cps-primitive-call> op args _)
(let ((op* (lookup-primitive-operator op)))
(indent level port)
(format port "~a ~a = "
(type-glsl-name type)
(variable-name var))
(if (primitive-operator-infix? op*)
(match args
;; Infix binary operator
((a b)
(format port "~a ~a ~a;\n"
(variable-name a)
(primitive-operator-glsl-name op*)
(variable-name b))))
;; Regular function call
(begin
(format port "~a(" (primitive-operator-glsl-name op*))
(let loop ((args args))
(match args
(() #t)
((arg)
(display (variable-name arg) port))
((arg . rest)
(format port "~a, " (variable-name arg))
(loop rest))))
(format port ");\n")))))
(($ <cps-function> body)
(match (intmap-ref graph body)
(($ <function-entry> _ params results start return type)
(indent level port)
(format port "function ~a(~a) {\n"
(variable-name var)
(string-join (append (map (lambda (param type)
(param-string 'in param type))
params (function-type-parameters type))
(map (lambda (result type)
(param-string 'out result type))
results (function-type-returns type)))
", "))
(pk 'start-function-body)
(emit-glsl* graph start #f (+ level 1) port)
(pk 'done-function-body)
(indent level port)
(format port "}\n"))))))
(define (param-string qualifier var type)
(format #f "~a ~a ~a"
qualifier
(type-glsl-name type)
(variable-name var)))
(match (pk 'emit-cont (intmap-ref graph k))
(($ <arguments> () ($ <return> ()) ())
(indent level port)
(format port "return;\n"))
(($ <arguments> (var) ($ <return> (result)) (type))
(emit-exp exp var type)
(indent level port)
(format port "return;\n"))
(($ <arguments> (var) ($ <return> ()) (type))
(pk 'blah exp type)
(emit-exp exp var type)
(indent level port)
(indent level port)
(format port "return;\n"))
(($ <arguments> () ($ <continue> _ k* exp*) _)
(emit-exp exp #f #f)
(emit-glsl* graph k* exp* level port))
(($ <arguments> (var) ($ <continue> _ k* exp*) (type))
(emit-exp exp var type)
(emit-glsl* graph k* exp* level port))
(($ <arguments> (var) ($ <branch> _ test k-conseq k-alt) (type))
(emit-exp exp var type)
(indent level port)
(format port "if(~a) {\n" (variable-name test))
(emit-glsl* graph k-conseq #f (+ level 1) port)
(format port "} else {\n")
(emit-glsl* graph k-alt #f (+ level 1) port)
(format port "}\n"))))
(define (emit-glsl graph)
(call-with-output-string
(lambda (port)
(emit-glsl* graph 0 #f 0 port))))
;; (define test-cps
;; (let ((int (lookup-type 'int)))
;; (alist->intmap
;; `((0 . ,(make-arguments '() (make-continue #f 1 (make-cps-constant 1))))
;; (1 . ,(make-arguments '(0) (make-continue #f 3 (make-cps-constant 2))))
;; (2 . ,(make-arguments '(1) (make-continue #f 5 (make-cps-primitive-call '+ '(0 1) int))))
;; (3 . ,(make-arguments '(3) (make-continue #f 4 (make-cps-constant 3))))
;; (4 . ,(make-arguments '(4) (make-continue #f 2 (make-cps-primitive-call '* '(3 4) int))))
;; (5 . ,(make-arguments '(5) (make-continue #f #f (make-cps-values '(5)))))))))
;; (emit-glsl test-cps)
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