diff options
| -rw-r--r-- | Makefile.am | 5 | ||||
| -rw-r--r-- | chickadee/render/asset.scm | 493 | ||||
| -rw-r--r-- | chickadee/render/model.scm | 911 | ||||
| -rw-r--r-- | chickadee/render/pbr.scm | 130 | ||||
| -rw-r--r-- | chickadee/render/phong.scm | 160 | ||||
| -rw-r--r-- | chickadee/render/scene.scm | 252 | ||||
| -rw-r--r-- | data/shaders/pbr/pbr-frag.glsl | 10 | ||||
| -rw-r--r-- | data/shaders/pbr/pbr-vert.glsl | 11 | ||||
| -rw-r--r-- | examples/model.scm | 73 | ||||
| -rw-r--r-- | examples/models/suzanne.obj | 2580 |
10 files changed, 3857 insertions, 768 deletions
diff --git a/Makefile.am b/Makefile.am index 7754081..171a4ce 100644 --- a/Makefile.am +++ b/Makefile.am @@ -68,9 +68,10 @@ SOURCES = \ chickadee/render/sprite.scm \ chickadee/render/font.scm \ chickadee/render/tiled.scm \ - chickadee/render/scene.scm \ - chickadee/render/asset.scm \ chickadee/render/particles.scm \ + chickadee/render/phong.scm \ + chickadee/render/pbr.scm \ + chickadee/render/model.scm \ chickadee/render.scm \ chickadee/scripting/agenda.scm \ chickadee/scripting/script.scm \ diff --git a/chickadee/render/asset.scm b/chickadee/render/asset.scm deleted file mode 100644 index 44e7afc..0000000 --- a/chickadee/render/asset.scm +++ /dev/null @@ -1,493 +0,0 @@ -;;; 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: -;; -;; Implementation of the glTF 2.0 specification -;; -;;; Code: - -(define-module (chickadee render asset) - #:use-module (chickadee json) - #:use-module (chickadee math matrix) - #:use-module (chickadee math vector) - #:use-module (chickadee render buffer) - #:use-module (chickadee render color) - #:use-module (chickadee render scene) - #:use-module (chickadee render shader) - #:use-module (chickadee render texture) - #:use-module (ice-9 format) - #:use-module (ice-9 match) - #:use-module (rnrs base) - #:use-module (rnrs bytevectors) - #:use-module (rnrs io ports) - #:use-module (srfi srfi-9) - #:use-module (srfi srfi-9 gnu) - #:use-module ((srfi srfi-43) #:select (vector-every)) - #:export (load-asset - asset? - asset-copyright - asset-generator - asset-scenes - asset-default-scene - draw-asset)) - -(define-record-type <asset> - (make-asset copyright generator scenes default-scene) - asset? - (copyright asset-copyright) - (generator asset-generator) - (scenes asset-scenes) - (default-scene asset-default-scene)) - -(define (display-asset asset port) - (format port "#<asset generator: ~s scene: ~s>" - (asset-generator asset) - (scene-name (asset-default-scene asset)))) - -(set-record-type-printer! <asset> display-asset) - -(define (read-gltf port file) - (define (object-ref obj key) - (let ((value (assoc-ref obj key))) - (unless (pair? value) - (error "expected object for key" key value)) - value)) - (define (object-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (unless (or (not value) (pair? value)) - (error "expected object for optional key" key value)) - value)) - (define (array-ref obj key) - (let ((value (assoc-ref obj key))) - (unless (vector? value) - (error "expected array for key" key value)) - value)) - (define (array-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (unless (or (not value) (vector? value)) - (error "expected array for optional key" key value)) - value)) - (define (string-ref obj key) - (let ((value (assoc-ref obj key))) - (unless (string? value) - (error "expected string for key" key value)) - value)) - (define (string-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (unless (or (not value) (string? value)) - (error "expected string for optional key" key value)) - value)) - (define (number-ref obj key) - (let ((value (assoc-ref obj key))) - (unless (number? value) - (error "expected number for key" key value)) - value)) - (define (number-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (unless (or (not value) (number? value)) - (error "expected number for key" key value)) - value)) - (define (boolean-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (unless (boolean? value) - (error "expected boolean for key" key value)) - value)) - (define (number-array-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (unless (or (not value) - (and (vector? value) (vector-every number? value))) - (error "expected numeric array for key" key value)) - value)) - (define (matrix-ref/optional obj key) - (let ((value (assoc-ref obj key))) - (cond - ((not value) #f) - ((and (vector? value) - (= (vector-length value) 16) - (vector-every number? value)) - ;; glTF matrices are in column-major order. - (make-matrix4 (vector-ref value 0) - (vector-ref value 4) - (vector-ref value 8) - (vector-ref value 12) - (vector-ref value 1) - (vector-ref value 5) - (vector-ref value 9) - (vector-ref value 13) - (vector-ref value 2) - (vector-ref value 6) - (vector-ref value 10) - (vector-ref value 14) - (vector-ref value 3) - (vector-ref value 7) - (vector-ref value 11) - (vector-ref value 15))) - (else - (error "expected 4x4 matrix for key" key value))))) - (define (assert-color v) - (if (and (= (vector-length v) 4) - (vector-every (lambda (x) (and (>= x 0.0) (<= x 1.0))) v)) - (make-color (vector-ref v 0) - (vector-ref v 1) - (vector-ref v 2) - (vector-ref v 3)) - (error "not a color vector" v))) - (define scope-file - (let ((gltf-root (dirname - (if (absolute-file-name? file) - file - (string-append (getcwd) "/" file))))) - (lambda (file) - (if (absolute-file-name? file) - file - (string-append gltf-root "/" file))))) - (define (parse-buffer obj) - ;; TODO: support base64 encoded buffer data as uri - ;; TODO: support glb-stored buffers: - ;; https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#glb-stored-buffer - (let* ((uri (string-ref/optional obj "uri")) - (length (number-ref obj "byteLength")) - (name (or (string-ref/optional obj "name") "anonymous")) - (extensions (object-ref/optional obj "extensions")) - (extras (assoc-ref obj "extras")) - (data (if uri - (call-with-input-file (scope-file uri) - (lambda (port) - (get-bytevector-n port length))) - (make-bytevector length)))) - data)) - (define (parse-buffer-view obj buffers) - (let ((name (string-ref/optional obj "name")) - (data (vector-ref buffers (number-ref obj "buffer"))) - (offset (or (number-ref/optional obj "byteOffset") 0)) - (length (number-ref obj "byteLength")) - (stride (number-ref/optional obj "byteStride")) - (target (match (or (number-ref/optional obj "target") 34962) - (34962 'vertex) - (34963 'index))) - (extensions (object-ref/optional obj "extensions")) - (extras (assoc-ref obj "extras"))) - (make-buffer data - #:name name - #:offset offset - #:length length - #:stride stride - #:target target))) - (define (parse-accessor obj buffer-views) - (define (type-length type) - (match type - ('scalar 1) - ('vec2 2) - ('vec3 3) - ('vec4 4) - ('mat2 4) - ('mat3 9) - ('mat4 16))) - (let ((name (or (string-ref/optional obj "name") "anonymous")) - (view (match (number-ref/optional obj "bufferView") - (#f #f) - (n (vector-ref buffer-views n)))) - (offset (or (number-ref/optional obj "byteOffset") 0)) - (component-type (match (number-ref obj "componentType") - (5120 'byte) - (5121 'unsigned-byte) - (5122 'short) - (5123 'unsigned-short) - (5125 'unsigned-int) - (5126 'float))) - (normalized? (boolean-ref/optional obj "normalized")) - (length (number-ref obj "count")) - (type (match (string-ref obj "type") - ("SCALAR" 'scalar) - ("VEC2" 'vec2) - ("VEC3" 'vec3) - ("VEC4" 'vec4) - ("MAT2" 'mat2) - ("MAT3" 'mat3) - ("MAT4" 'mat4))) - (max (number-array-ref/optional obj "max")) - (min (number-array-ref/optional obj "min")) - (sparse (object-ref/optional obj "sparse")) - (extensions (object-ref/optional obj "extensions")) - (extras (assoc-ref obj "extras"))) - (unless (>= length 1) - (error "count must be greater than 0" length)) - (when (and (vector? max) - (not (= (vector-length max) (type-length type)))) - (error "not enough elements for max" max type)) - (when (and (vector? min) - (not (= (vector-length min) (type-length type)))) - (error "not enough elements for min" min type)) - (make-buffer-view #:name name - #:buffer view - #:offset offset - #:component-type component-type - #:normalized? normalized? - #:length length - #:type type - #:max max - #:min min - #:sparse sparse))) - (define (texture-filter n) - (match n - (9728 'nearest) - ((or #f 9729) 'linear) - ;; TODO: Support mip-mapping - ;; (9984 'nearest-mipmap-nearest) - ;; (9985 'linear-mipmap-nearest) - ;; (9986 'nearest-mipmap-linear) - ;; (9987 'linear-mipmap-linear) - (_ 'linear))) - (define (texture-wrap n) - (match n - (10496 'clamp) - ((or #f 10497) 'repeat) - (33069 'clamp-to-border) - (33071 'clamp-to-edge))) - (define (parse-texture obj images samplers) - (let ((image (vector-ref images (number-ref obj "source"))) - (sampler - (vector-ref samplers (or (number-ref/optional obj "sampler") 0)))) - (load-image (scope-file (string-ref image "uri")) - #:min-filter (texture-filter - (number-ref/optional sampler "minFilter")) - #:mag-filter (texture-filter - (number-ref/optional sampler "magFilter")) - #:wrap-s (texture-wrap (number-ref/optional sampler "wrapS")) - #:wrap-t (texture-wrap (number-ref/optional sampler "wrapT"))))) - (define (parse-material obj textures) - (let* ((name (or (string-ref/optional obj "name") "anonymous")) - (pbrmr (or (object-ref/optional obj "pbrMetallicRoughness") '())) - (base-color-factor - (let ((v (or (number-array-ref/optional pbrmr "baseColorFactor") - #(1.0 1.0 1.0 1.0)))) - (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) - (base-color-texture - (match (object-ref/optional pbrmr "baseColorTexture") - (#f null-texture) - (obj - (vector-ref textures (number-ref obj "index"))))) - (metallic-factor - (or (number-ref/optional pbrmr "metallicFactor") - 1.0)) - (roughness-factor - (or (number-ref/optional pbrmr "roughnessFactor") - 1.0)) - (metallic-roughness-texture - (match (object-ref/optional pbrmr "metallicRoughnessTexture") - (#f null-texture) - (obj - (vector-ref textures (number-ref obj "index"))))) - (normal-factor - (let ((v (or (array-ref/optional obj "normalFactor") - #(1.0 1.0 1.0)))) - (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) - (normal-texture - (match (object-ref/optional obj "normalTexture") - (#f null-texture) - (obj (vector-ref textures (number-ref obj "index"))))) - (occlusion-factor - (let ((v (or (array-ref/optional obj "occlusionFactor") - #(1.0 1.0 1.0)))) - (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) - (occlusion-texture - (match (object-ref/optional obj "occlusionTexture") - (#f null-texture) - (obj (vector-ref textures (number-ref obj "index"))))) - (emissive-factor - (let ((v (or (array-ref/optional obj "emissiveFactor") - #(1.0 1.0 1.0)))) - (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) - (emissive-texture - (match (object-ref/optional obj "emissiveTexture") - (#f null-texture) - (obj (vector-ref textures (number-ref obj "index"))))) - (alpha-mode (match (or (string-ref/optional obj "alphaMode") - "BLEND") - ("OPAQUE" 'opaque) - ("MASK" 'mask) - ("BLEND" 'blend))) - (alpha-cutoff (or (number-ref/optional obj "alphaCutoff") 0.5)) - (double-sided? (boolean-ref/optional obj "doubleSided")) - (extensions (object-ref/optional obj "extensions")) - (extras (assoc-ref obj "extras"))) - (make-material #:name name - #:base-color-factor base-color-factor - #:base-color-texture base-color-texture - #:metallic-factor metallic-factor - #:roughness-factor roughness-factor - #:metallic-roughness-texture metallic-roughness-texture - #:normal-factor normal-factor - #:normal-texture normal-texture - #:occlusion-factor occlusion-factor - #:occlusion-texture occlusion-texture - #:emissive-factor emissive-factor - #:emissive-texture emissive-texture - #:alpha-mode alpha-mode - #:alpha-cutoff alpha-cutoff - #:double-sided? double-sided?))) - (define (attribute-name->index name) - (match name - ("POSITION" - (attribute-location - (hash-ref (shader-attributes (pbr-shader)) "position"))) - ("NORMAL" 1) - ("TANGENT" 2) - ("TEXCOORD_0" - (attribute-location - (hash-ref (shader-attributes (pbr-shader)) "texcoord_0"))) - ("TEXCOORD_1" 4) - ("COLOR_0" 5) - ("JOINTS_0" 6) - ("WEIGHTS_0" 7))) - (define (parse-primitive obj materials accessors) - (let ((attributes (map (match-lambda - ((name . n) - (cons (attribute-name->index name) - (vector-ref accessors n)))) - (object-ref obj "attributes"))) - (indices (match (number-ref/optional obj "indices") - (#f #f) - (n (vector-ref accessors n)))) - ;; TODO: Set a default material when none is given. - (material (match (number-ref/optional obj "material") - (#f #f) - (n (vector-ref materials n)))) - (mode (match (or (number-ref/optional obj "mode") 4) - (0 'points) - (1 'lines) - (2 'line-loop) - (3 'line-strip) - (4 'triangles) - (5 'triangle-strip) - (6 'triangle-fan))) - ;; TODO: Support morph targets. - (targets #f)) - (make-primitive #:vertex-array - (make-vertex-array #:indices indices - #:attributes attributes - #:mode mode) - #:material material - #:targets targets))) - (define (parse-mesh obj materials accessors) - (let ((name (or (string-ref/optional obj "name") "anonymous")) - (primitives - (map (lambda (obj) - (parse-primitive obj materials accessors)) - (vector->list (array-ref obj "primitives")))) - (weights (number-array-ref/optional obj "weights"))) - (make-mesh #:name name - #:primitives primitives - #:weights weights))) - (define (parse-node obj parse-child meshes) - ;; TODO: Parse all fields of nodes. - (let ((name (or (string-ref/optional obj "name") "anonymous")) - ;; TODO: Parse camera. - (camera #f) - ;; TODO: Parse skin. - (skin #f) - (matrix (or (matrix-ref/optional obj "matrix") - (make-identity-matrix4))) - (mesh (match (number-ref/optional obj "mesh") - (#f #f) - (n (vector-ref meshes n)))) - ;; TODO: Parse rotation, scale, translation - (rotation #f) - (scale #f) - (translation #f) - ;; TODO: Parse weights. - (weights #f) - (children (map parse-child - (vector->list - (or (array-ref/optional obj "children") - #()))))) - (make-scene-node #:name name - #:children children - #:camera camera - #:skin skin - #:matrix matrix - #:mesh mesh - #:rotation rotation - #:scale scale - #:translation translation - #:weights weights))) - (define (parse-nodes array meshes) - (define nodes (make-vector (vector-length array) #f)) - (define (parse-node* i) - (let ((node (vector-ref nodes i))) - (or node - (let ((node (parse-node (vector-ref array i) - parse-node* - meshes))) - (vector-set! nodes i node) - node)))) - (let loop ((i 0)) - (when (< i (vector-length array)) - (parse-node* i) - (loop (+ i 1)))) - nodes) - (define (parse-scene obj nodes) - (let ((name (or (string-ref/optional obj "name") "anonymous")) - (children - (map (lambda (i) (vector-ref nodes i)) - (vector->list - (or (number-array-ref/optional obj "nodes") - #()))))) - (make-scene #:name name #:nodes children))) - (let* ((tree (read-json port)) - (asset (object-ref tree "asset")) - (version (string-ref asset "version")) - (copyright (string-ref/optional asset "copyright")) - (generator (string-ref/optional asset "generator")) - (minimum-version (string-ref/optional asset "minVersion")) - (extensions (object-ref/optional asset "extensions")) - ;; TODO: Figure out how to parse extras in a user-defined way - (extras (assoc-ref asset "extras")) - (buffers (vector-map parse-buffer - (or (assoc-ref tree "buffers") #()))) - (buffer-views (vector-map (lambda (obj) - (parse-buffer-view obj buffers)) - (or (assoc-ref tree "bufferViews") #()))) - (accessors (vector-map (lambda (obj) - (parse-accessor obj buffer-views)) - (or (assoc-ref tree "accessors") #()))) - (images (or (assoc-ref tree "images") #())) - (samplers (or (assoc-ref tree "samplers") #(()))) - (textures (vector-map (lambda (obj) - (parse-texture obj images samplers)) - (or (assoc-ref tree "textures") #()))) - (materials (vector-map (lambda (obj) - (parse-material obj textures)) - (or (assoc-ref tree "materials") #()))) - (meshes (vector-map (lambda (obj) - (parse-mesh obj materials accessors)) - (or (assoc-ref tree "meshes") #()))) - (nodes (parse-nodes (or (assoc-ref tree "nodes") #()) meshes)) - (scenes (map (lambda (obj) - (parse-scene obj nodes)) - (vector->list - (or (assoc-ref tree "scenes") #())))) - (default-scene (list-ref scenes - (or (number-ref/optional tree "scene") - 0)))) - (unless (string=? version "2.0") - (error "unsupported glTF version" version)) - (make-asset copyright generator scenes default-scene))) - -(define (load-asset file) - (call-with-input-file file (lambda (port) (read-gltf port file)))) diff --git a/chickadee/render/model.scm b/chickadee/render/model.scm new file mode 100644 index 0000000..1a9356d --- /dev/null +++ b/chickadee/render/model.scm @@ -0,0 +1,911 @@ +;;; Chickadee Game Toolkit +;;; Copyright © 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/>. + +;;; Commentary: +;; +;; 3D Model loading and rendering. +;; +;;; Code: + +(define-module (chickadee render model) + #:use-module (chickadee array-list) + #:use-module (chickadee json) + #:use-module (chickadee math matrix) + #:use-module (chickadee math vector) + #:use-module (chickadee render) + #:use-module (chickadee render buffer) + #:use-module (chickadee render color) + #:use-module (chickadee render pbr) + #:use-module (chickadee render phong) + #:use-module (chickadee render shader) + #:use-module (chickadee render texture) + #:use-module (ice-9 format) + #:use-module (ice-9 match) + #:use-module (ice-9 rdelim) + #:use-module (rnrs bytevectors) + #:use-module (rnrs io ports) + #:use-module (srfi srfi-9) + #:use-module ((srfi srfi-43) #:select (vector-every)) + #:export (model? + draw-model + load-obj + load-gltf)) + + +;;; +;;; Rendering State +;;; + +(define-record-type <render-state> + (%make-render-state shader renderer world-matrix view-matrix) + render-state? + (shader render-state-shader) + (renderer render-state-renderer) + (world-matrix render-state-world-matrix) + (view-matrix render-state-view-matrix)) + +(define* (make-render-state #:key shader renderer) + (%make-render-state shader renderer + (make-identity-matrix4) + (make-identity-matrix4))) + +(define (render-state-reset! state) + (matrix4-identity! (render-state-world-matrix state)) + (matrix4-identity! (render-state-view-matrix state))) + +(define (render-state-world-matrix-mult! state matrix) + (let ((world (render-state-world-matrix state))) + (matrix4-mult! world world matrix))) + +(define (render-state-view-matrix-mult! state matrix) + (let ((view (render-state-view-matrix state))) + (matrix4-mult! view view matrix))) + + +;;; +;;; Primitives +;;; + +;; A piece of a mesh. Represents a single draw call. +(define-record-type <primitive> + (make-primitive name vertex-array material) + primitive? + (name primitive-name) + (vertex-array primitive-vertex-array) + (material primitive-material)) + +(define (draw-primitive/phong primitive state) + (gpu-apply/phong (render-state-shader state) + (primitive-vertex-array primitive) + (primitive-material primitive) + (render-state-world-matrix state) + (render-state-view-matrix state))) + +(define (draw-primitive/pbr primitive state) + (gpu-apply/pbr (render-state-shader state) + (primitive-vertex-array primitive) + (primitive-material primitive) + (render-state-world-matrix state) + (render-state-view-matrix state))) + + +;;; +;;; Meshes +;;; + +;; A complete 3D model composed of many primitives. +(define-record-type <mesh> + (make-mesh name primitives) + mesh? + (name mesh-name) + (primitives mesh-primitives)) + +(define (draw-mesh mesh state) + (let ((render (render-state-renderer state))) + (for-each (lambda (primitive) (render primitive state)) + (mesh-primitives mesh)))) + + +;;; +;;; Scene Node +;;; + +;; A tree of meshes with their own transformation matrices. +(define-record-type <scene-node> + (%make-scene-node name mesh matrix children) + node? + (name scene-node-name) + (mesh scene-node-mesh) + (matrix scene-node-matrix) + (children scene-node-children)) + +(define* (make-scene-node #:key + (name "anonymous") + mesh + (matrix (make-identity-matrix4)) + (children '())) + (%make-scene-node name mesh matrix children)) + +(define (draw-scene-node node state) + ;; TODO: Apply push/pop model matrix stuff. + (for-each (lambda (child) + (draw-scene-node child state)) + (scene-node-children node)) + (let ((mesh (scene-node-mesh node))) + (when mesh + (draw-mesh mesh state)))) + + +;;; +;;; Model +;;; + +;; A collection of scenes and the associated information about *how* +;; to actually render the darn thing. +(define-record-type <model> + (%make-model name scenes default-scene render-state) + model? + (name model-name) + (scenes model-scenes) + (default-scene model-default-scene) + (render-state model-render-state)) + +(define* (make-model #:key name scenes (default-scene (car scenes)) render-state) + (%make-model name scenes default-scene render-state)) + +(define (draw-model model model-matrix view-matrix) + ;; TODO: Support drawing non-default scenes. + (let ((state (model-render-state model))) + (render-state-reset! state) + (render-state-view-matrix-mult! state view-matrix) + (render-state-world-matrix-mult! state model-matrix) + (draw-scene-node (model-default-scene model) state))) + + +;;; +;;; OBJ Format +;;; + +(define (load-obj file-name) + (define (scope-file other-file) + (string-append (dirname file-name) "/" other-file)) + (call-with-input-file file-name + (lambda (port) + (let ((vertices (make-array-list)) + (texcoords (make-array-list)) + (normals (make-array-list)) + (faces (make-array-list)) + (face-map (make-hash-table)) + (face-indices-map (make-hash-table)) + (material-map (make-hash-table))) + (define (load-mtl mtl-file-name) + (call-with-input-file mtl-file-name + (lambda (port) + (let loop ((name #f) + (ambient #f) + (diffuse #f) + (specular #f) + (shininess #f)) + (define (maybe-add-material) + (when name + (hash-set! material-map + name + (make-phong-material + #:name name + #:ambient ambient + #:diffuse diffuse + #:specular specular + #:shininess shininess)))) + (match (read-line port) + ((? eof-object?) + (maybe-add-material)) + (line + (match (delete "" (string-split line char-set:whitespace)) + ((or () ("#" . _)) ; ignore comments and blank lines + (loop name ambient diffuse specular shininess)) + (("Ka" r g b) + (let ((new-ambient (vec3 (string->number r) + (string->number g) + (string->number b)))) + (loop name new-ambient diffuse specular shininess))) + (("Kd" r g b) + (let ((new-diffuse (vec3 (string->number r) + (string->number g) + (string->number b)))) + (loop name ambient new-diffuse specular shininess))) + (("Ks" r g b) + (let ((new-specular (vec3 (string->number r) + (string->number g) + (string->number b)))) + (loop name ambient diffuse new-specular shininess))) + (("Ns" n) + (let ((new-exp (* (string->number n) 1.0))) ; force it to be a float + (loop name ambient diffuse specular new-exp))) + (("newmtl" new-name) + ;; Begin new material + (maybe-add-material) + (loop new-name + (vec3 0.0 0.0 0.0) + (vec3 0.0 0.0 0.0) + (vec3 0.0 0.0 0.0) + 1.0)) + (data + (format (current-error-port) + "warning: ~a:~d: unsupported MTL data: ~s~%" + mtl-file-name + (port-line port) + data) + (loop name ambient diffuse specular shininess))))))))) + (define (parse-error message args) + (apply error (format #f "OBJ parser error @ ~a:~d: ~a" + file-name + (port-line port) + message) + args)) + (define (parse-vertex args) + (array-list-push! vertices + (match args + ((x y z) + (vec3 (string->number x) + (string->number y) + (string->number z))) + ;; TODO: handle w properly + ((x y z w) + (vec3 (string->number x) + (string->number y) + (string->number z))) + (_ + (parse-error "wrong number of vertex arguments" args))))) + (define (parse-texcoord args) + ;; TODO: Handle w properly. + (array-list-push! texcoords + (match args + ((u) + (vec2 (string->number u) 0.0)) + ((u v) + (vec2 (string->number u) (string->number v))) + ((u v w) + (vec2 (string->number u) + (string->number v))) + (_ + (parse-error "wrong number of texcoord arguments" args))))) + (define (parse-normal args) + (array-list-push! normals + (match args + ((i j k) + (vec3 (string->number i) + (string->number j) + (string->number k))) + (_ + (parse-error "wrong number of normal arguments" args))))) + (define (parse-face-index arg) + (- (string->number arg) 1)) + (define (parse-face-element arg) + (match (string-split arg #\/) + ((v) + (list (parse-face-index v) #f #f)) + ((v t) + (list (parse-face-index v) + (parse-face-index t) + #f)) + ((v "" n) + (list (parse-face-index v) + #f + (parse-face-index n))) + ((v t n) + (list (parse-face-index v) + (parse-face-index t) + (parse-face-index n))) + (_ + (parse-error "invalid face syntax" (list arg))))) + (define (indices-for-material material) + (or (hash-ref face-indices-map material) + (let ((new-indices (make-array-list))) + (hash-set! face-indices-map material new-indices) + new-indices))) + (define (parse-face args material) + (match args + ((and (_ _ _ . _) args) + (for-each (lambda (e) + ;; Faces may very well be redundant, so we + ;; deduplicate in order to make the VBOs we + ;; build later as small as possible. + (let ((cached-index (hash-ref face-map e)) + (face-indices (indices-for-material material))) + (if cached-index + (array-list-push! face-indices cached-index) + (let ((i (array-list-size faces))) + (array-list-push! faces (parse-face-element e)) + (array-list-push! face-indices i) + (hash-set! face-map e i))))) + args)) + (_ + (parse-error "wrong number of face arguments" args)))) + ;; Register default material + (hash-set! material-map "default" default-phong-material) + ;; Parse file. + (let loop ((material "default")) + (match (read-line port) + ((? eof-object?) + #f) + (line + (match (delete "" (string-split line char-set:whitespace)) + ((or () ("#" . _)) ; ignore comments and blank lines + (loop material)) + (("f" . args) + (parse-face args material) + (loop material)) + (("g" . _) ; ignore + (loop material)) + (("mtllib" mtl-file-name) + (load-mtl (scope-file mtl-file-name)) + (loop material)) + (("s" . _) ; ignore + (loop material)) + (("usemtl" new-material) + (loop new-material)) + (("v" . args) + (parse-vertex args) + (loop material)) + (("vn" . args) + (parse-normal args) + (loop material)) + (("vt" . args) + (parse-texcoord args) + (loop material)) + (data + (format (current-error-port) + "warning: ~a:~d: unsupported OBJ data: ~s~%" + file-name + (port-line port) + data) + (loop material)))))) + ;; Build a vertex array for all the faces of a single + ;; material. + ;; + ;; XXX: We assume there is normal and texture data. Models + ;; that don't have one or both will still use up as much + ;; memory as if they did. Maybe that's just fine? Dunno. + (define (make-primitive-for-material material) + (let* ((face-indices (indices-for-material material)) + (vertex-count (array-list-size faces)) + (index-count (array-list-size face-indices)) + (stride 8) + (mesh-data (make-f32vector (* vertex-count stride))) + (mesh-indices (make-u32vector index-count)) + (null-texcoord (vec2 0.0 0.0)) + (null-normal (vec3 0.0 0.0 0.0))) + ;; The mesh vertex data is packed like so: + ;; - 3 floats for vertex + ;; - 2 floats for texture coordinate + ;; - 3 floats for normal + ;; - repeat for each face + (let loop ((i 0)) + (when (< i vertex-count) + (let ((offset (* i stride))) + (match (array-list-ref faces i) + ((vert-index tex-index norm-index) + ;; Vertex + (let ((v (array-list-ref vertices vert-index))) + (f32vector-set! mesh-data offset (vec3-x v)) + (f32vector-set! mesh-data (+ offset 1) (vec3-y v)) + (f32vector-set! mesh-data (+ offset 2) (vec3-z v))) + ;; Texture coordinate + (let ((t (if tex-index + (array-list-ref texcoords tex-index) + null-texcoord))) + (f32vector-set! mesh-data (+ offset 3) (vec2-x t)) + (f32vector-set! mesh-data (+ offset 4) (vec2-y t))) + ;; Normal + (let ((n (if norm-index + (array-list-ref normals norm-index) + null-normal))) + (f32vector-set! mesh-data (+ offset 5) (vec3-x n)) + (f32vector-set! mesh-data (+ offset 6) (vec3-y n)) + (f32vector-set! mesh-data (+ offset 7) (vec3-z n)))))) + (loop (+ i 1)))) + ;; Pack indices. + (let loop ((i 0)) + (when (< i index-count) + (u32vector-set! mesh-indices i (array-list-ref face-indices i)) + (loop (+ i 1)))) + ;; Construct vertex array. + ;; TODO: Add names to buffers and views. + (let* ((index-buffer (make-buffer mesh-indices #:target 'index)) + (index-view (make-buffer-view #:type 'scalar + #:component-type 'unsigned-int + #:buffer index-buffer)) + (data-buffer (make-buffer mesh-data #:stride (* stride 4))) + (vertex-view (make-buffer-view #:type 'vec3 + #:component-type 'float + #:buffer data-buffer)) + (texcoord-view (make-buffer-view #:type 'vec2 + #:component-type 'float + #:buffer data-buffer + #:offset 12)) + (normal-view (make-buffer-view #:type 'vec3 + #:component-type 'float + #:buffer data-buffer + #:offset 20))) + (make-primitive material + (make-vertex-array + #:indices index-view + #:attributes `((0 . ,vertex-view) + (1 . ,texcoord-view) + (2 . ,normal-view))) + (or (hash-ref material-map material) + (hash-ref material-map "default")))))) + ;; Construct a mesh by composing primitives. One primitive + ;; per material. + (let* ((model-name (basename file-name)) + (mesh (make-mesh model-name + (hash-fold (lambda (material indices memo) + ;; It's possible that a material has + ;; no data associated with it, so we + ;; drop those. + (if (array-list-empty? indices) + memo + (cons (make-primitive-for-material material) + memo))) + '() + face-indices-map))) + (scene (make-scene-node #:name model-name + #:mesh mesh))) + (make-model #:name model-name + #:scenes (list scene) + #:render-state + (make-render-state #:shader (load-phong-shader) + #:renderer draw-primitive/phong))))))) + + +;;; +;;; glTF 2.0 +;;; + +(define (load-gltf file-name) + (define (object-ref obj key) + (let ((value (assoc-ref obj key))) + (unless (pair? value) + (error "expected object for key" key value)) + value)) + (define (object-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (unless (or (not value) (pair? value)) + (error "expected object for optional key" key value)) + value)) + (define (array-ref obj key) + (let ((value (assoc-ref obj key))) + (unless (vector? value) + (error "expected array for key" key value)) + value)) + (define (array-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (unless (or (not value) (vector? value)) + (error "expected array for optional key" key value)) + value)) + (define (string-ref obj key) + (let ((value (assoc-ref obj key))) + (unless (string? value) + (error "expected string for key" key value)) + value)) + (define (string-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (unless (or (not value) (string? value)) + (error "expected string for optional key" key value)) + value)) + (define (number-ref obj key) + (let ((value (assoc-ref obj key))) + (unless (number? value) + (error "expected number for key" key value)) + value)) + (define (number-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (unless (or (not value) (number? value)) + (error "expected number for key" key value)) + value)) + (define (boolean-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (unless (boolean? value) + (error "expected boolean for key" key value)) + value)) + (define (number-array-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (unless (or (not value) + (and (vector? value) (vector-every number? value))) + (error "expected numeric array for key" key value)) + value)) + (define (matrix-ref/optional obj key) + (let ((value (assoc-ref obj key))) + (cond + ((not value) #f) + ((and (vector? value) + (= (vector-length value) 16) + (vector-every number? value)) + ;; glTF matrices are in column-major order. + (make-matrix4 (vector-ref value 0) + (vector-ref value 4) + (vector-ref value 8) + (vector-ref value 12) + (vector-ref value 1) + (vector-ref value 5) + (vector-ref value 9) + (vector-ref value 13) + (vector-ref value 2) + (vector-ref value 6) + (vector-ref value 10) + (vector-ref value 14) + (vector-ref value 3) + (vector-ref value 7) + (vector-ref value 11) + (vector-ref value 15))) + (else + (error "expected 4x4 matrix for key" key value))))) + (define (assert-color v) + (if (and (= (vector-length v) 4) + (vector-every (lambda (x) (and (>= x 0.0) (<= x 1.0))) v)) + (make-color (vector-ref v 0) + (vector-ref v 1) + (vector-ref v 2) + (vector-ref v 3)) + (error "not a color vector" v))) + (define scope-file + (let ((gltf-root (dirname + (if (absolute-file-name? file-name) + file-name + (string-append (getcwd) "/" file-name))))) + (lambda (other-file) + (if (absolute-file-name? other-file) + other-file + (string-append gltf-root "/" other-file))))) + (define (parse-buffer obj) + ;; TODO: support base64 encoded buffer data as uri + ;; TODO: support glb-stored buffers: + ;; https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#glb-stored-buffer + (let* ((uri (string-ref/optional obj "uri")) + (length (number-ref obj "byteLength")) + (name (or (string-ref/optional obj "name") "anonymous")) + (extensions (object-ref/optional obj "extensions")) + (extras (assoc-ref obj "extras")) + (data (if uri + (call-with-input-file (scope-file uri) + (lambda (port) + (get-bytevector-n port length))) + (make-bytevector length)))) + data)) + (define (parse-buffer-view obj buffers) + (let ((name (string-ref/optional obj "name")) + (data (vector-ref buffers (number-ref obj "buffer"))) + (offset (or (number-ref/optional obj "byteOffset") 0)) + (length (number-ref obj "byteLength")) + (stride (number-ref/optional obj "byteStride")) + (target (match (or (number-ref/optional obj "target") 34962) + (34962 'vertex) + (34963 'index))) + (extensions (object-ref/optional obj "extensions")) + (extras (assoc-ref obj "extras"))) + (make-buffer data + #:name name + #:offset offset + #:length length + #:stride stride + #:target target))) + (define (parse-accessor obj buffer-views) + (define (type-length type) + (match type + ('scalar 1) + ('vec2 2) + ('vec3 3) + ('vec4 4) + ('mat2 4) + ('mat3 9) + ('mat4 16))) + (let ((name (or (string-ref/optional obj "name") "anonymous")) + (view (match (number-ref/optional obj "bufferView") + (#f #f) + (n (vector-ref buffer-views n)))) + (offset (or (number-ref/optional obj "byteOffset") 0)) + (component-type (match (number-ref obj "componentType") + (5120 'byte) + (5121 'unsigned-byte) + (5122 'short) + (5123 'unsigned-short) + (5125 'unsigned-int) + (5126 'float))) + (normalized? (boolean-ref/optional obj "normalized")) + (length (number-ref obj "count")) + (type (match (string-ref obj "type") + ("SCALAR" 'scalar) + ("VEC2" 'vec2) + ("VEC3" 'vec3) + ("VEC4" 'vec4) + ("MAT2" 'mat2) + ("MAT3" 'mat3) + ("MAT4" 'mat4))) + (max (number-array-ref/optional obj "max")) + (min (number-array-ref/optional obj "min")) + (sparse (object-ref/optional obj "sparse")) + (extensions (object-ref/optional obj "extensions")) + (extras (assoc-ref obj "extras"))) + (unless (>= length 1) + (error "count must be greater than 0" length)) + (when (and (vector? max) + (not (= (vector-length max) (type-length type)))) + (error "not enough elements for max" max type)) + (when (and (vector? min) + (not (= (vector-length min) (type-length type)))) + (error "not enough elements for min" min type)) + (make-buffer-view #:name name + #:buffer view + #:offset offset + #:component-type component-type + #:normalized? normalized? + #:length length + #:type type + #:max max + #:min min + #:sparse sparse))) + (define (texture-filter n) + (match n + (9728 'nearest) + ((or #f 9729) 'linear) + ;; TODO: Support mip-mapping + ;; (9984 'nearest-mipmap-nearest) + ;; (9985 'linear-mipmap-nearest) + ;; (9986 'nearest-mipmap-linear) + ;; (9987 'linear-mipmap-linear) + (_ 'linear))) + (define (texture-wrap n) + (match n + (10496 'clamp) + ((or #f 10497) 'repeat) + (33069 'clamp-to-border) + (33071 'clamp-to-edge))) + (define (parse-texture obj images samplers) + (let ((image (vector-ref images (number-ref obj "source"))) + (sampler + (vector-ref samplers (or (number-ref/optional obj "sampler") 0)))) + (load-image (scope-file (string-ref image "uri")) + #:min-filter (texture-filter + (number-ref/optional sampler "minFilter")) + #:mag-filter (texture-filter + (number-ref/optional sampler "magFilter")) + #:wrap-s (texture-wrap (number-ref/optional sampler "wrapS")) + #:wrap-t (texture-wrap (number-ref/optional sampler "wrapT"))))) + (define (parse-material obj textures) + (let* ((name (or (string-ref/optional obj "name") "anonymous")) + (pbrmr (or (object-ref/optional obj "pbrMetallicRoughness") '())) + (base-color-factor + (let ((v (or (number-array-ref/optional pbrmr "baseColorFactor") + #(1.0 1.0 1.0 1.0)))) + (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) + (base-color-texture + (match (object-ref/optional pbrmr "baseColorTexture") + (#f null-texture) + (obj + (vector-ref textures (number-ref obj "index"))))) + (metallic-factor + (or (number-ref/optional pbrmr "metallicFactor") + 1.0)) + (roughness-factor + (or (number-ref/optional pbrmr "roughnessFactor") + 1.0)) + (metallic-roughness-texture + (match (object-ref/optional pbrmr "metallicRoughnessTexture") + (#f null-texture) + (obj + (vector-ref textures (number-ref obj "index"))))) + (normal-factor + (let ((v (or (array-ref/optional obj "normalFactor") + #(1.0 1.0 1.0)))) + (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) + (normal-texture + (match (object-ref/optional obj "normalTexture") + (#f null-texture) + (obj (vector-ref textures (number-ref obj "index"))))) + (occlusion-factor + (let ((v (or (array-ref/optional obj "occlusionFactor") + #(1.0 1.0 1.0)))) + (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) + (occlusion-texture + (match (object-ref/optional obj "occlusionTexture") + (#f null-texture) + (obj (vector-ref textures (number-ref obj "index"))))) + (emissive-factor + (let ((v (or (array-ref/optional obj "emissiveFactor") + #(1.0 1.0 1.0)))) + (vec3 (vector-ref v 0) (vector-ref v 1) (vector-ref v 2)))) + (emissive-texture + (match (object-ref/optional obj "emissiveTexture") + (#f null-texture) + (obj (vector-ref textures (number-ref obj "index"))))) + (alpha-mode (match (or (string-ref/optional obj "alphaMode") + "BLEND") + ("OPAQUE" 'opaque) + ("MASK" 'mask) + ("BLEND" 'blend))) + (alpha-cutoff (or (number-ref/optional obj "alphaCutoff") 0.5)) + (double-sided? (boolean-ref/optional obj "doubleSided")) + (extensions (object-ref/optional obj "extensions")) + (extras (assoc-ref obj "extras"))) + (make-pbr-material #:name name + #:base-color-factor base-color-factor + #:base-color-texture base-color-texture + #:metallic-factor metallic-factor + #:roughness-factor roughness-factor + #:metallic-roughness-texture metallic-roughness-texture + #:normal-factor normal-factor + #:normal-texture normal-texture + #:occlusion-factor occlusion-factor + #:occlusion-texture occlusion-texture + #:emissive-factor emissive-factor + #:emissive-texture emissive-texture + #:alpha-mode alpha-mode + #:alpha-cutoff alpha-cutoff + #:double-sided? double-sided?))) + (define (attribute-name->index name) + (let ((shader (load-pbr-shader))) + (match name + ("POSITION" + (attribute-location + (hash-ref (shader-attributes shader) "position"))) + ("NORMAL" 1) + ("TANGENT" 2) + ("TEXCOORD_0" + (attribute-location + (hash-ref (shader-attributes shader) "texcoord0"))) + ("TEXCOORD_1" 4) + ("COLOR_0" 5) + ("JOINTS_0" 6) + ("WEIGHTS_0" 7)))) + (define (parse-primitive obj materials accessors) + (let ((attributes (map (match-lambda + ((name . n) + (cons (attribute-name->index name) + (vector-ref accessors n)))) + (object-ref obj "attributes"))) + (indices (match (number-ref/optional obj "indices") + (#f #f) + (n (vector-ref accessors n)))) + ;; TODO: Set a default material when none is given. + (material (match (number-ref/optional obj "material") + (#f #f) + (n (vector-ref materials n)))) + (mode (match (or (number-ref/optional obj "mode") 4) + (0 'points) + (1 'lines) + (2 'line-loop) + (3 'line-strip) + (4 'triangles) + (5 'triangle-strip) + (6 'triangle-fan))) + ;; TODO: Support morph targets. + (targets #f)) + (make-primitive "primitive" + (make-vertex-array #:indices indices + #:attributes attributes + #:mode mode) + material))) + (define (parse-mesh obj materials accessors) + (let ((name (or (string-ref/optional obj "name") "anonymous")) + (primitives + (map (lambda (obj) + (parse-primitive obj materials accessors)) + (vector->list (array-ref obj "primitives")))) + (weights (number-array-ref/optional obj "weights"))) + ;; TODO: Support weights. + (make-mesh name primitives))) + (define (parse-node obj parse-child meshes) + ;; TODO: Parse all fields of nodes. + (let ((name (or (string-ref/optional obj "name") "anonymous")) + ;; TODO: Parse camera. + (camera #f) + ;; TODO: Parse skin. + (skin #f) + (matrix (or (matrix-ref/optional obj "matrix") + (make-identity-matrix4))) + (mesh (match (number-ref/optional obj "mesh") + (#f #f) + (n (vector-ref meshes n)))) + ;; TODO: Parse rotation, scale, translation + (rotation #f) + (scale #f) + (translation #f) + ;; TODO: Parse weights. + (weights #f) + (children (map parse-child + (vector->list + (or (array-ref/optional obj "children") + #()))))) + (make-scene-node #:name name + #:children children + #:matrix matrix + #:mesh mesh))) + (define (parse-nodes array meshes) + (define nodes (make-vector (vector-length array) #f)) + (define (parse-node* i) + (let ((node (vector-ref nodes i))) + (or node + (let ((node (parse-node (vector-ref array i) + parse-node* + meshes))) + (vector-set! nodes i node) + node)))) + (let loop ((i 0)) + (when (< i (vector-length array)) + (parse-node* i) + (loop (+ i 1)))) + nodes) + (define (parse-scene obj nodes) + (let ((name (or (string-ref/optional obj "name") "anonymous")) + (children + (map (lambda (i) (vector-ref nodes i)) + (vector->list + (or (number-array-ref/optional obj "nodes") + #()))))) + (make-scene-node #:name name #:children children))) + (define (vector-map proc v) + (let ((new-v (make-vector (vector-length v)))) + (let loop ((i 0)) + (when (< i (vector-length v)) + (vector-set! new-v i (proc (vector-ref v i))) + (loop (+ i 1)))) + new-v)) + (call-with-input-file file-name + (lambda (port) + (let* ((tree (read-json port)) + (asset (object-ref tree "asset")) + (version (string-ref asset "version")) + (copyright (string-ref/optional asset "copyright")) + (generator (string-ref/optional asset "generator")) + (minimum-version (string-ref/optional asset "minVersion")) + (extensions (object-ref/optional asset "extensions")) + ;; TODO: Figure out how to parse extras in a user-defined way + (extras (assoc-ref asset "extras")) + (buffers (vector-map parse-buffer + (or (assoc-ref tree "buffers") #()))) + (buffer-views (vector-map (lambda (obj) + (parse-buffer-view obj buffers)) + (or (assoc-ref tree "bufferViews") #()))) + (accessors (vector-map (lambda (obj) + (parse-accessor obj buffer-views)) + (or (assoc-ref tree "accessors") #()))) + (images (or (assoc-ref tree "images") #())) + (samplers (or (assoc-ref tree "samplers") #(()))) + (textures (vector-map (lambda (obj) + (parse-texture obj images samplers)) + (or (assoc-ref tree "textures") #()))) + (materials (vector-map (lambda (obj) + (parse-material obj textures)) + (or (assoc-ref tree "materials") #()))) + (meshes (vector-map (lambda (obj) + (parse-mesh obj materials accessors)) + (or (assoc-ref tree "meshes") #()))) + (nodes (parse-nodes (or (assoc-ref tree "nodes") #()) meshes)) + (scenes (map (lambda (obj) + (parse-scene obj nodes)) + (vector->list + (or (assoc-ref tree "scenes") #())))) + (default-scene (list-ref scenes + (or (number-ref/optional tree "scene") + 0)))) + (unless (string=? version "2.0") + (error "unsupported glTF version" version)) + (make-model #:name (basename file-name) + #:scenes (list default-scene) + #:render-state + (make-render-state #:shader (load-pbr-shader) + #:renderer draw-primitive/pbr)))))) diff --git a/chickadee/render/pbr.scm b/chickadee/render/pbr.scm new file mode 100644 index 0000000..2738b77 --- /dev/null +++ b/chickadee/render/pbr.scm @@ -0,0 +1,130 @@ +;;; Chickadee Game Toolkit +;;; Copyright © 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/>. + +;;; Commentary: +;; +;; Physically based lighting model. +;; +;;; Code: + +(define-module (chickadee render pbr) + #:use-module (chickadee math vector) + #:use-module (chickadee render) + #:use-module (chickadee render color) + #:use-module (chickadee render shader) + #:use-module (chickadee render texture) + #:use-module (srfi srfi-9) + #:export (make-pbr-material + pbr-material? + pbr-material-name + pbr-material-base-color-factor + pbr-material-base-color-texture + pbr-material-metallic-factor + pbr-material-roughness-factor + pbr-material-metallic-roughness-texture + pbr-material-normal-factor + pbr-material-normal-texture + pbr-material-occlusion-facgor + pbr-material-occlusion-texture + pbr-material-emissive-factor + pbr-material-emissive-texture + pbr-material-alpha-mode + pbr-material-alpha-cutoff + pbr-material-double-sided? + default-pbr-material + load-pbr-shader + gpu-apply/pbr)) + +(define-shader-type <pbr-material> + make-pbr-material + pbr-material? + (local-field name pbr-material-name) + (float-vec3 base-color-factor pbr-material-base-color-factor) + (local-field base-color-texture pbr-material-base-color-texture) + (float metallic-factor pbr-material-metallic-factor) + (float roughness-factor pbr-material-roughness-factor) + (local-field metallic-roughness-texture pbr-material-metallic-roughness-texture) + (float-vec3 normal-factor pbr-material-normal-factor) + (local-field normal-texture pbr-material-normal-texture) + (float-vec3 occlusion-factor pbr-material-occlusion-factor) + (local-field occlusion-texture pbr-material-occlusion-texture) + (float-vec3 emissive-factor pbr-material-emissive-factor) + (local-field emissive-texture pbr-material-emissive-texture) + (local-field alpha-mode pbr-material-alpha-mode) + (float alpha-cutoff pbr-material-alpha-cutoff) + (bool double-sided? pbr-material-double-sided?)) + +(define default-pbr-material + (make-pbr-material #:name "default" + #: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? #f)) + +;; TODO: Actually implement PBR. For now it's just the minimal amount +;; of code needed to render the base texture of a mesh. +(define pbr-shader + (delay + (strings->shader + " +#version 130 + +in vec3 position; +in vec2 texcoord0; +out vec2 fragTex; +uniform mat4 model; +uniform mat4 view; +uniform mat4 projection; + +void main(void) { + fragTex = texcoord0; + gl_Position = projection * view * model * vec4(position.xyz, 1.0); +} +" + " +#version 130 + +in vec2 fragTex; +uniform vec3 baseColorFactor; +uniform sampler2D baseColorTexture; + +void main (void) { + gl_FragColor = texture2D(baseColorTexture, fragTex) * + vec4(baseColorFactor, 1.0); +} +"))) + +(define (load-pbr-shader) + (force pbr-shader)) + +(define (gpu-apply/pbr shader vertex-array material model-matrix view-matrix) + (with-texture 0 (pbr-material-base-color-texture material) + (gpu-apply shader vertex-array + #:model model-matrix + #:view view-matrix + #:projection (current-projection) + #:base-color-factor (pbr-material-base-color-factor material)))) diff --git a/chickadee/render/phong.scm b/chickadee/render/phong.scm new file mode 100644 index 0000000..07c0eeb --- /dev/null +++ b/chickadee/render/phong.scm @@ -0,0 +1,160 @@ +;;; Chickadee Game Toolkit +;;; Copyright © 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/>. + +;;; Commentary: +;; +;; Simple forward rendered Phong lighting model. +;; +;;; Code: + +(define-module (chickadee render phong) + #:use-module (chickadee math vector) + #:use-module (chickadee render) + #:use-module (chickadee render color) + #:use-module (chickadee render shader) + #:use-module (srfi srfi-9) + #:export (make-phong-material + phong-material? + phong-material-name + phong-material-ambient + phong-material-diffuse + phong-material-specular + phong-material-specular-exponent + default-phong-material + load-phong-shader + gpu-apply/phong)) + + +;;; +;;; Phong Material +;;; + +(define-shader-type <phong-material> + make-phong-material + phong-material? + (local-field name phong-material-name) + (float-vec3 ambient phong-material-ambient) + (float-vec3 diffuse phong-material-diffuse) + (float-vec3 specular phong-material-specular) + (float shininess phong-material-shininess)) + +(define default-phong-material + (make-phong-material #:name "default" + #:ambient (vec3 0.5 0.5 0.5) + #:diffuse (vec3 0.5 0.5 0.5) + #:specular (vec3 0.5 0.5 0.5) + #:shininess 32.0)) + + +;;; +;;; Lights +;;; + +(define-shader-type <directional-light> + make-directional-light + directional-light? + (float-vec4 color directional-light-color) + (float-vec3 direction directional-light-direction) + (float-vec3 ambient directional-light-ambient) + (float-vec3 diffuse directional-light-diffuse) + (float-vec3 specular directional-light-specular) + (float shininess directional-light-shininess)) + +(define default-directional-light + (make-directional-light #:color white + #:direction (vec3 -1.0 0.0 -1.0) + #:ambient (vec3 0.5 0.5 0.5) + #:diffuse (vec3 0.5 0.5 0.5) + #:specular (vec3 0.5 0.5 0.5) + #:shininess 32.0)) + + +;;; +;;; Phong Shader +;;; + +(define phong-shader + (delay + (strings->shader + " +#version 130 + +in vec3 position; +in vec2 texcoord; +in vec3 normal; + +uniform mat4 model; +uniform mat4 view; +uniform mat4 projection; + +out vec3 fragNorm; +out vec2 fragTex; + +void main() { + gl_Position = projection * view * model * vec4(position, 1.0); + // TODO: Calculate normal matrix on CPU + fragNorm = normalize(model * vec4(normal, 1.0)).xyz; + fragTex = texcoord; +} +" + " +#version 130 + +struct Material { + vec3 ambient; + vec3 diffuse; + vec3 specular; + float shininess; +}; + +struct DirectionalLight { + vec4 color; + vec3 direction; + vec3 ambient; + vec3 diffuse; + vec3 specular; +}; + +in vec3 fragNorm; +in vec2 fragTex; + +uniform Material material; +uniform DirectionalLight directionalLight; + +void main() { + vec3 lightColor = directionalLight.color.xyz; + vec3 ambientColor = material.ambient * lightColor; + vec3 lightDir = normalize(-directionalLight.direction); + float diffuseFactor = max(dot(lightDir, fragNorm), 0.0); + vec3 diffuseColor = diffuseFactor * material.diffuse * lightColor; + vec3 reflectDir = reflect(-lightDir, fragNorm); + float specularFactor = pow(max(dot(lightDir, reflectDir), 0.0), material.shininess); + vec3 specularColor = specularFactor * material.specular * lightColor; + gl_FragColor = vec4(ambientColor + diffuseColor + specularColor, 1.0); +} +"))) + +(define (load-phong-shader) + (force phong-shader)) + +(define (gpu-apply/phong shader vertex-array material model-matrix view-matrix) + (gpu-apply shader vertex-array + #:model model-matrix + #:view view-matrix + #:projection (current-projection) + #:material material + #:directional-light default-directional-light)) diff --git a/chickadee/render/scene.scm b/chickadee/render/scene.scm deleted file mode 100644 index 818957e..0000000 --- a/chickadee/render/scene.scm +++ /dev/null @@ -1,252 +0,0 @@ -;;; 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))) diff --git a/data/shaders/pbr/pbr-frag.glsl b/data/shaders/pbr/pbr-frag.glsl deleted file mode 100644 index 1552880..0000000 --- a/data/shaders/pbr/pbr-frag.glsl +++ /dev/null @@ -1,10 +0,0 @@ -#version 130 - -in vec2 frag_tex; -uniform vec3 base_color_factor; -uniform sampler2D base_color_texture; - -void main (void) { - gl_FragColor = texture2D(base_color_texture, frag_tex) * - vec4(base_color_factor, 1.0); -} diff --git a/data/shaders/pbr/pbr-vert.glsl b/data/shaders/pbr/pbr-vert.glsl deleted file mode 100644 index b6fefef..0000000 --- a/data/shaders/pbr/pbr-vert.glsl +++ /dev/null @@ -1,11 +0,0 @@ -#version 130 - -in vec3 position; -in vec2 texcoord_0; -out vec2 frag_tex; -uniform mat4 mvp; - -void main(void) { - frag_tex = texcoord_0; - gl_Position = mvp * vec4(position.xyz, 1.0); -} diff --git a/examples/model.scm b/examples/model.scm new file mode 100644 index 0000000..cc73918 --- /dev/null +++ b/examples/model.scm @@ -0,0 +1,73 @@ +(use-modules (chickadee) + (chickadee math) + (chickadee math matrix) + (chickadee math vector) + (chickadee render) + (chickadee render model) + (chickadee render font) + (ice-9 format)) + +(define projection (perspective-projection (/ pi 3) (/ 4.0 3.0) 0.1 500.0)) +(define rotation (make-identity-matrix4)) +(define translation (make-identity-matrix4)) +(define view-matrix (make-identity-matrix4)) +(define model-matrix (make-identity-matrix4)) +(define position (vec3 0.0 0.0 0.0)) +(define velocity (vec3 0.0 0.0 0.0)) +(define model #f) +(define text-position #v(4.0 464.0)) +(define text "") +(define y-rotation 0.0) + +(define (reset-position) + (set-vec3! position 0.0 0.0 -4.0)) + +(define (load) + (set! model (load-obj "models/suzanne.obj")) + (reset-position)) + +(define (draw alpha) + (with-projection projection + (with-depth-test #t + (draw-model model model-matrix view-matrix))) + (draw-text text text-position)) + +(define (update dt) + ;; Update camera position + (set-vec3! velocity + (+ (if (key-pressed? 'd) -1.0 0.0) + (if (key-pressed? 'a) 1.0 0.0)) + 0.0 + (+ (if (key-pressed? 's) -1.0 0.0) + (if (key-pressed? 'w) 1.0 0.0))) + (vec3-normalize! velocity) + (vec3-mult! velocity 0.1) + (vec3-add! position velocity) + (set! text (format #f "(~6,2f, ~6,2f, ~6,2f)" + (vec3-x position) + (vec3-y position) + (vec3-z position))) + + ;; Compute new view matrix + (matrix4-rotate-y! rotation theta) + (matrix4-translate! translation position) + (matrix4-identity! view-matrix) + (matrix4-mult! view-matrix view-matrix rotation) + (matrix4-mult! view-matrix view-matrix translation) + + ;; Rotate the model about the y-axis + (set! y-rotation (+ y-rotation 0.03)) + (matrix4-rotate-y! model-matrix y-rotation)) + +(define (key-press key scancode modifiers repeat?) + (cond + ((eq? key 'q) + (abort-game)) + ((eq? key 'r) + (reset-position)))) + +(run-game #:window-title "3D!" + #:load load + #:draw draw + #:update update + #:key-press key-press) diff --git a/examples/models/suzanne.obj b/examples/models/suzanne.obj new file mode 100644 index 0000000..7d657dc --- /dev/null +++ b/examples/models/suzanne.obj @@ -0,0 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