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Diffstat (limited to 'chickadee/render/scene.scm')
| -rw-r--r-- | chickadee/render/scene.scm | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/chickadee/render/scene.scm b/chickadee/render/scene.scm new file mode 100644 index 0000000..279d4e6 --- /dev/null +++ b/chickadee/render/scene.scm @@ -0,0 +1,242 @@ +;;; 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-metallic-roughness + default-metallic-roughness + metallic-roughness? + metallic-roughness-base-color + metallic-roughness-base-color-texture + metallic-roughness-metallic-factor + metallic-roughness-roughness-factor + metallic-roughness-texture + make-material + default-material + material? + material-name + material-metallic-roughness + material-normal-texture + material-occlusion-texture + material-emissive-texture + material-emissive-factor + 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 <metallic-roughness> + (%make-metallic-roughness base-color base-color-texture metallic-factor + roughness-factor texture) + metallic-roughness? + (base-color metallic-roughness-base-color) + (base-color-texture metallic-roughness-base-color-texture) + (metallic-factor metallic-roughness-metallic-factor) + (roughness-factor metallic-roughness-roughness-factor) + (texture metallic-roughness-texture)) + +(define* (make-metallic-roughness #:key + (base-color white) + base-color-texture + (metallic-factor 1.0) + (roughness-factor 1.0) + texture) + (%make-metallic-roughness base-color base-color-texture metallic-factor + roughness-factor texture)) + +(define default-metallic-roughness (make-metallic-roughness)) + +(define-record-type <material> + (%make-material name metallic-roughness normal-texture occlusion-texture + emissive-texture emissive-factor alpha-mode alpha-cutoff + double-sided?) + material? + (name material-name) + (metallic-roughness material-metallic-roughness) + (normal-texture material-normal-texture) + (occlusion-texture material-occlusion-texture) + (emissive-texture material-emissive-texture) + (emissive-factor material-emissive-factor) + (alpha-mode material-alpha-mode) + (alpha-cutoff material-alpha-cutoff) + (double-sided? material-double-sided?)) + +(define* (make-material #:key + (name "anonymous") + (metallic-roughness default-metallic-roughness) + normal-texture + occlusion-texture + emissive-texture + (emissive-factor (vec3 0.0 0.0 0.0)) + (alpha-mode 'opaque) + (alpha-cutoff 0.5) + double-sided?) + (%make-material name metallic-roughness normal-texture 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) + primitive? + (vertex-array primitive-vertex-array) + (material primitive-material) + (targets primitive-targets)) + +(define* (make-primitive #:key + vertex-array + (material default-material) + targets) + (%make-primitive vertex-array material targets)) + +(define-record-type <mesh> + (%make-mesh name primitives weights) + mesh? + (name mesh-name) + (primitives mesh-primitives) + (weights mesh-weights)) + +(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 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) + (mesh scene-node-mesh) + (rotation scene-node-rotation) + (scale scene-node-scale) + (translation scene-node-translation) + (weights scene-node-weights)) + +(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 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 modelview + (make-matrix4 1.0 0.0 0.0 0.0 + 0.0 1.0 0.0 0.0 + 0.0 0.0 1.0 0.0 + 0.0 0.0 1.0 1.0) + ;;(make-identity-matrix4) + ) + +(define (draw-primitive primitive matrix) + ;; TODO: Use material. + ;; TODO: Actually use physically based rendering. + (gpu-apply (pbr-shader) + (primitive-vertex-array primitive) + #:mvp (matrix4* modelview (current-projection)) + )) + +(define (draw-mesh mesh matrix) + (for-each (lambda (primitive) + (draw-primitive primitive matrix)) + (mesh-primitives mesh))) + +(define (draw-scene-node node matrix) + ;; TODO: Apply transformation matrix. + (let ((world-matrix (matrix4* 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 (make-identity-matrix4))) + (scene-nodes scene))) |