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;;; Chickadee Game Toolkit
;;; Copyright © 2016, 2019 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/>.
(define-module (chickadee render gpu)
#:use-module (oop goops)
#:use-module (srfi srfi-9)
#:export (make-gpu-state
gpu-state-ref
gpu-state-set!
gpu-finalize
gpu-guard
gpu-reap!
make-gpu
current-gpu
gpu?
gpu-gl-context
gpu-blend-mode
gpu-depth-test
gpu-framebuffer
gpu-shader
gpu-texture
gpu-vertex-buffer
gpu-vertex-array
gpu-viewport
set-gpu-blend-mode!
set-gpu-depth-test!
set-gpu-framebuffer!
set-gpu-shader!
set-gpu-texture!
set-gpu-vertex-buffer!
set-gpu-vertex-array!
set-gpu-viewport!))
;;;
;;; GPU state
;;;
(define-record-type <gpu-state>
(make-gpu-state bind value)
gpu-state?
(bind gpu-state-bind)
(value gpu-state-ref %gpu-state-set!))
(define (gpu-state-set! state new-value)
(unless (eq? new-value (gpu-state-ref state))
((gpu-state-bind state) new-value)
(%gpu-state-set! state new-value)))
;;;
;;; GPU finalizers
;;;
(define-generic gpu-finalize)
(define *gpu-guardian* (make-guardian))
(define (gpu-guard obj)
"Protect OBJ for the garbage collector until OBJ has been deleted
from the GPU's memory."
(*gpu-guardian* obj)
obj)
(define (gpu-reap!)
"Delete all GPU objects that are no longer being referenced."
(let loop ((obj (*gpu-guardian*)))
(when obj
(gpu-finalize obj)
(loop (*gpu-guardian*)))))
;;;
;;; GPU
;;;
(define-record-type <gpu>
(%make-gpu gl-context
blend-mode
depth-test
framebuffer
shader
textures
vertex-buffer
vertex-array
viewport)
gpu?
(gl-context gpu-gl-context)
(blend-mode %gpu-blend-mode)
(depth-test %gpu-depth-test)
(framebuffer %gpu-framebuffer)
(shader %gpu-shader)
(textures gpu-textures)
(vertex-buffer %gpu-vertex-buffer)
(vertex-array %gpu-vertex-array)
(viewport %gpu-viewport))
(define current-gpu (make-parameter #f))
(define (make-gpu gl-context)
(let ((textures (make-vector 32))
;; Lazily resolve bindings to avoid circular dependencies.
(blend-module (resolve-interface '(chickadee render blend)))
(buffer-module (resolve-interface '(chickadee render buffer)))
(framebuffer-module (resolve-interface '(chickadee render framebuffer)))
(shader-module (resolve-interface '(chickadee render shader)))
(texture-module (resolve-interface '(chickadee render texture)))
(viewport-module (resolve-interface '(chickadee render viewport))))
;; Create state for 32 texture units.
(let loop ((i 0))
(when (< i 32)
(vector-set! textures i
(let ((apply-texture (module-ref texture-module 'apply-texture)))
(make-gpu-state (lambda (texture)
(apply-texture i texture))
(module-ref texture-module 'null-texture))))
(loop (+ i 1))))
(%make-gpu gl-context
;; Use @ and @@ to avoid circular module dependencies.
(make-gpu-state (module-ref blend-module 'apply-blend-mode)
'replace)
(make-gpu-state (module-ref blend-module 'apply-depth-test)
#f)
(make-gpu-state (module-ref framebuffer-module 'apply-framebuffer)
(module-ref framebuffer-module 'null-framebuffer))
(make-gpu-state (module-ref shader-module 'apply-shader)
(module-ref shader-module 'null-shader))
textures
(make-gpu-state (module-ref buffer-module 'apply-buffer)
(module-ref buffer-module 'null-buffer))
(make-gpu-state (module-ref buffer-module 'apply-vertex-array)
(module-ref buffer-module 'null-vertex-array))
(make-gpu-state (module-ref viewport-module 'apply-viewport)
(module-ref viewport-module 'null-viewport)))))
(define-syntax-rule (define-gpu-getter name ref)
(define (name gpu)
(gpu-state-ref (ref gpu))))
(define-gpu-getter gpu-blend-mode %gpu-blend-mode)
(define-gpu-getter gpu-depth-test %gpu-depth-test)
(define-gpu-getter gpu-framebuffer %gpu-framebuffer)
(define-gpu-getter gpu-shader %gpu-shader)
(define-gpu-getter gpu-vertex-buffer %gpu-vertex-buffer)
(define-gpu-getter gpu-vertex-array %gpu-vertex-array)
(define-gpu-getter gpu-viewport %gpu-viewport)
(define-syntax-rule (define-gpu-setter name ref)
(define (name gpu x)
(gpu-state-set! (ref gpu) x)))
(define-gpu-setter set-gpu-blend-mode! %gpu-blend-mode)
(define-gpu-setter set-gpu-depth-test! %gpu-depth-test)
(define-gpu-setter set-gpu-framebuffer! %gpu-framebuffer)
(define-gpu-setter set-gpu-shader! %gpu-shader)
(define-gpu-setter set-gpu-vertex-buffer! %gpu-vertex-buffer)
(define-gpu-setter set-gpu-vertex-array! %gpu-vertex-array)
(define-gpu-setter set-gpu-viewport! %gpu-viewport)
(define (gpu-texture gpu texture-unit)
(gpu-state-ref (vector-ref (gpu-textures gpu) texture-unit)))
(define (set-gpu-texture! gpu texture-unit texture)
(gpu-state-set! (vector-ref (gpu-textures gpu) texture-unit) texture))
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