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;;; Chickadee Game Toolkit
;;; Copyright © 2017 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:
;;
;; 3D scene graph with physically based rendering.
;;
;;; Code:
(define-module (chickadee render scene)
#:use-module (chickadee config)
#:use-module (chickadee math matrix)
#:use-module (chickadee math quaternion)
#:use-module (chickadee math vector)
#:use-module (chickadee render)
#:use-module (chickadee render color)
#:use-module (chickadee render buffer)
#:use-module (chickadee render texture)
#:use-module (chickadee render shader)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:export (make-material
default-material
material?
material-name
material-base-color-factor
material-base-color-texture
material-metallic-factor
material-roughness-factor
material-metallic-roughness-texture
material-normal-factor
material-normal-texture
material-occlusion-facgor
material-occlusion-texture
material-emissive-factor
material-emissive-texture
material-alpha-mode
material-alpha-cutoff
material-double-sided?
pbr-shader
make-primitive
primitive?
primitive-vertex-array
primitive-material
primitive-targets
make-mesh
mesh?
mesh-name
mesh-primitives
mesh-weights
make-scene-node
scene-node?
scene-node-name
scene-node-children
scene-node-camera
scene-node-skin
scene-node-matrix
scene-node-mesh
scene-node-rotation
scene-node-scale
scene-node-translation
scene-node-weights
make-scene
scene?
scene-name
scene-nodes
draw-scene))
(define-record-type <material>
(%make-material name base-color-factor base-color-texture
metallic-factor roughness-factor metallic-roughness-texture
normal-factor normal-texture
occlusion-factor occlusion-texture
emissive-texture emissive-factor
alpha-mode alpha-cutoff
double-sided?)
material?
(name material-name)
(base-color-factor material-base-color-factor)
(base-color-texture material-base-color-texture)
(metallic-factor material-metallic-factor)
(roughness-factor material-roughness-factor)
(metallic-roughness-texture material-metallic-roughness-texture)
(normal-factor material-normal-factor)
(normal-texture material-normal-texture)
(occlusion-factor material-occlusion-factor)
(occlusion-texture material-occlusion-texture)
(emissive-factor material-emissive-factor)
(emissive-texture material-emissive-texture)
(alpha-mode material-alpha-mode)
(alpha-cutoff material-alpha-cutoff)
(double-sided? material-double-sided?))
(define* (make-material #:key
(name "anonymous")
(base-color-factor #v(1.0 1.0 1.0))
(base-color-texture null-texture)
(metallic-factor 1.0)
(roughness-factor 1.0)
(metallic-roughness-texture null-texture)
(normal-factor #v(1.0 1.0 1.0))
(normal-texture null-texture)
(occlusion-factor #v(1.0 1.0 1.0))
(occlusion-texture null-texture)
(emissive-factor #v(1.0 1.0 1.0))
(emissive-texture null-texture)
(alpha-mode 'opaque)
(alpha-cutoff 0.5)
double-sided?)
(%make-material name base-color-factor base-color-texture
metallic-factor roughness-factor metallic-roughness-texture
normal-factor normal-texture
occlusion-factor occlusion-texture
emissive-texture emissive-factor
alpha-mode alpha-cutoff double-sided?))
(define default-material (make-material))
(define pbr-shader
(let ((shader
(delay
(load-shader (scope-datadir "shaders/pbr/pbr-vert.glsl")
(scope-datadir "shaders/pbr/pbr-frag.glsl")))))
(lambda ()
(force shader))))
(define-record-type <primitive>
(%make-primitive vertex-array material targets matrix)
primitive?
(vertex-array primitive-vertex-array)
(material primitive-material)
(targets primitive-targets)
(matrix primitive-matrix))
(define (display-primitive primitive port)
(format port "#<primitive material: ~s targets: ~s>"
(primitive-material primitive)
(primitive-targets primitive)))
(set-record-type-printer! <primitive> display-primitive)
(define* (make-primitive #:key
vertex-array
(material default-material)
targets)
(%make-primitive vertex-array material targets (make-identity-matrix4)))
(define-record-type <mesh>
(%make-mesh name primitives weights)
mesh?
(name mesh-name)
(primitives mesh-primitives)
(weights mesh-weights))
(define (display-mesh mesh port)
(format port "#<mesh name: ~s>" (mesh-name mesh)))
(set-record-type-printer! <mesh> display-mesh)
(define* (make-mesh #:key
(name "anonymous")
primitives
weights)
(%make-mesh name primitives weights))
(define-record-type <scene-node>
(%make-scene-node name children camera skin matrix world-matrix
mesh rotation scale translation weights)
node?
(name scene-node-name)
(children scene-node-children)
(camera scene-node-camera)
(skin scene-node-skin)
(matrix scene-node-matrix)
(world-matrix scene-node-world-matrix)
(mesh scene-node-mesh)
(rotation scene-node-rotation)
(scale scene-node-scale)
(translation scene-node-translation)
(weights scene-node-weights))
(define (display-scene-node scene port)
(format port "#<scene-node name: ~s>" (scene-node-name scene)))
(set-record-type-printer! <scene-node> display-scene-node)
(define* (make-scene-node #:key
(name "anonymous")
(children #())
camera
skin
(matrix (make-identity-matrix4))
mesh
(rotation (quaternion 0.0 0.0 0.0 1.0))
(scale (vec3 1.0 1.0 1.0))
(translation (vec3 0.0 0.0 0.0))
weights)
(%make-scene-node name children camera skin matrix (make-identity-matrix4)
mesh rotation scale translation weights))
(define-record-type <scene>
(%make-scene name nodes)
scene?
(name scene-name)
(nodes scene-nodes))
(define* (make-scene #:key (name "anonymous") (nodes '()))
(%make-scene name nodes))
(define (draw-primitive primitive matrix)
;; TODO: Actually use physically based rendering.
(let ((mvp (primitive-matrix primitive))
(material (primitive-material primitive)))
(matrix4-mult! mvp matrix (current-projection))
(with-texture 0 (material-base-color-texture material)
(gpu-apply (pbr-shader)
(primitive-vertex-array primitive)
#:mvp mvp
#:base_color_factor (material-base-color-factor material)))))
(define (draw-mesh mesh matrix)
(for-each (lambda (primitive)
(draw-primitive primitive matrix))
(mesh-primitives mesh)))
(define (draw-scene-node node matrix)
(let ((world-matrix (scene-node-world-matrix node)))
(matrix4-mult! world-matrix matrix (scene-node-matrix node))
(when (scene-node-mesh node)
(draw-mesh (scene-node-mesh node) world-matrix))
(for-each (lambda (node)
(draw-scene-node node world-matrix))
(scene-node-children node))))
(define (draw-scene scene)
(for-each (lambda (scene)
(draw-scene-node scene (scene-node-world-matrix scene)))
(scene-nodes scene)))
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