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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.
(define-module (chickadee graphics seagull utils)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:use-module (language cps intmap)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:export (float?
sourcev->string
stage:vertex
stage:fragment
shader-stage?
vertex-stage?
fragment-stage?
environment?
fresh-environment
environment
bound?
lookup
extend
compose-environments
intmap->alist
alist->intmap))
(define (float? x)
(and (number? x) (inexact? x)))
(define (sourcev->string sourcev)
(match sourcev
(#f
"unknown location")
(#(#f line column)
(format #f "unknown:~a:~a" line column))
(#(file line column)
(format #f "~a:~a:~a" file line column))))
;;;
;;; Shader stages
;;;
(define-record-type <shader-stage>
(shader-stage name)
shader-stage?
(name shader-stage-name))
(define stage:vertex (shader-stage 'vertex))
(define stage:fragment (shader-stage 'fragment))
(define (vertex-stage? obj)
(eq? obj stage:vertex))
(define (fragment-stage? obj)
(eq? obj stage:fragment))
;;;
;;; Environments
;;;
;; Environments provide a lookup table. Used for lexical scoping,
;; alpha conversion, etc.
(define-record-type <environment>
(make-environment bindings)
environment?
(bindings environment-bindings))
(define (fresh-environment)
(make-environment '()))
(define-syntax-rule (environment (key value) ...)
(make-environment (list (cons 'key value) ...)))
(define (lookup name env)
(assq-ref (environment-bindings env) name))
(define (bound? name env)
(not (not (lookup name env))))
(define (extend name value env)
(make-environment
(alist-cons name value (environment-bindings env))))
(define (compose-environments . envs)
(match envs
((a b)
(make-environment
(append (environment-bindings a)
(environment-bindings b))))
(_
(make-environment
(concatenate
(map environment-bindings envs))))))
;;;
;;; Intmap helpers
;;;
(define (intmap->alist intmap)
(intmap-fold-right alist-cons intmap '()))
(define (alist->intmap alist)
(fold (lambda (pair intmap)
(match pair
((k . v)
(intmap-add intmap k v))))
empty-intmap alist))
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