(define-module (assimp assimp)
+ #:use-module (assimp low-level scene)
+ #:use-module (ice-9 iconv)
#:use-module (rnrs bytevectors)
#:use-module (system foreign))
(dynamic-func "aiImportFile" libassimp)
(list '* unsigned-int)))
-(define-wrapped-pointer-type scene
- scene?
- wrap-scene unwrap-scene
- (lambda (s p)
- (format p "#<scene ~x>"
- (pointer-address (unwrap-scene s)))))
-(define (load-scene filename flags)
- (wrap-scene
- (aiImportFile (string->pointer filename)
- flags)))
+;;; Type Generation
-(bytevector-uint-ref (pointer->bytevector numptob (sizeof long))
- 0 (native-endianness)
- (sizeof long))
+(define-syntax define-type
+ (lambda (x)
+ (define (mk-string . args)
+ (string-concatenate
+ (map (lambda (a)
+ (if (string? a)
+ a
+ (symbol->string (syntax->datum a))))
+ args)))
+ (define (mk-symbol . args)
+ (datum->syntax x
+ (string->symbol
+ (apply mk-string args))))
+ (syntax-case x ()
+ ((_ name parser (field field-proc) ...)
+ (with-syntax ((type? (mk-symbol #'name "?"))
+ (wrap-type (mk-symbol "wrap-" #'name))
+ (unwrap-type (mk-symbol "unwrap-" #'name))
+ (output-string (mk-string "#<" #'name " ~x>"))
+ (type-contents (mk-symbol #'name "-contents")))
+ #'(begin
+ (define-wrapped-pointer-type name
+ type?
+ wrap-type unwrap-type
+ (lambda (x p)
+ (format p output-string
+ (pointer-address (unwrap-type x)))))
+ (define (type-contents wrapped)
+ (let ((unwrapped (unwrap-type wrapped)))
+ (cond ((= (pointer-address unwrapped) 0)
+ '())
+ (else
+ (filter
+ (lambda (f)
+ (not (null? (cdr f))))
+ (list (cons 'field (field-proc unwrapped))
+ ...))))))))))))
-(define (scene-contents scene)
- (bytevector-uint-ref (pointer->bytevector (unwrap-scene scene) 16)
- 0 (native-endiannes) 4))
+(define (bv-uint-ref pointer index)
+ (bytevector-uint-ref
+ (pointer->bytevector pointer 4 index)
+ 0
+ (native-endianness)
+ 4))
-(export load-scene)
+(define (get-aiString index)
+ (lambda (pointer)
+ (let* ((length (bv-uint-ref pointer index))
+ (data (pointer->bytevector pointer length (+ index 4))))
+ (bytevector->string data (fluid-ref %default-port-encoding)))))
+
+(define* (get-pointer index #:optional wrap-proc)
+ (lambda (pointer)
+ (let ((p (bv-uint-ref pointer index)))
+ (cond ((= p 0) '())
+ (else
+ (let ((p2 (make-pointer p)))
+ (list
+ (cond (wrap-proc (wrap-proc p2))
+ (else p2)))))))))
+
+(define (get-array num-index root-index type)
+ (lambda (pointer)
+ (let ((num (bv-uint-ref pointer num-index))
+ (rootp (make-pointer (bv-uint-ref pointer root-index))))
+ (cond ((> num 0)
+ (array->list
+ (pointer->bytevector rootp num 0 type)))
+ (else
+ '())))))
+
+(define* (get-structs-array num-index root-index struct-size #:optional wrap-proc)
+ (lambda (pointer)
+ (let ((num (bv-uint-ref pointer num-index))
+ (rootp (bv-uint-ref pointer root-index)))
+ (let loop ((i (- num 1)))
+ (cond ((< i 0)
+ '())
+ (else
+ (let* ((p (make-pointer (+ rootp (* i struct-size))))
+ (wp (if wrap-proc (wrap-proc p) p)))
+ (cons wp (loop (- i 1))))))))))
+
+(define* (get-pointer-of-pointers num-index root-index #:optional wrap-proc)
+ (lambda (pointer)
+ (let* ((num (bv-uint-ref pointer num-index))
+ (rootp (make-pointer (bv-uint-ref pointer root-index))))
+ (let loop ((i 0))
+ (cond ((= i num)
+ '())
+ (else
+ (let* ((p (make-pointer (bv-uint-ref rootp (* 4 i))))
+ (wp (if wrap-proc (wrap-proc p) p)))
+ (cons wp (loop (+ i 1))))))))))
+
+(define-syntax define-conversion-type
+ (lambda (x)
+ (define (mk-string . args)
+ (string-concatenate
+ (map (lambda (a)
+ (if (string? a)
+ a
+ (symbol->string (syntax->datum a))))
+ args)))
+ (define (mk-symbol . args)
+ (datum->syntax x
+ (string->symbol
+ (apply mk-string args))))
+ (syntax-case x (->)
+ ((_ parser -> name (field-name field-proc) ...)
+ (with-syntax ((type? (mk-symbol #'name "?"))
+ (wrap-type (mk-symbol "wrap-" #'name))
+ (unwrap-type (mk-symbol "unwrap-" #'name))
+ (output-string (mk-string "#<" #'name " ~x>"))
+ (type-contents (mk-symbol #'name "-contents"))
+ (type-parse (mk-symbol #'name "-parse"))
+ ((field-reader ...) (map (lambda (f) (mk-symbol #'name "-" (car f))) #'((field-name field-proc) ...))))
+ #'(begin
+ (define-wrapped-pointer-type name
+ type?
+ wrap-type unwrap-type
+ (lambda (x p)
+ (format p output-string
+ (pointer-address (unwrap-type x)))))
+ (define (type-parse wrapped)
+ (let ((unwrapped (unwrap-type wrapped)))
+ (cond ((= (pointer-address unwrapped) 0)
+ '())
+ (else
+ (parser unwrapped)))))
+ (define (type-contents wrapped)
+ (let ((alist (type-parse wrapped)))
+ (list (cons 'field-name (field-proc alist))
+ ...)))
+ (define (field-reader wrapped)
+ (let ((alist (type-parse wrapped)))
+ (field-proc alist)))
+ ...))))))
+
+(define (field name)
+ (lambda (alist)
+ (assoc-ref alist name)))
+
+(define (array size-tag root-tag)
+ (lambda (alist)
+ (let ((size (assoc-ref alist size-tag))
+ (root (assoc-ref alist root-tag)))
+ (let loop ((i 0))
+ (cond ((= i size)
+ '())
+ (else
+ (cons (bv-uint-ref root (* 4 i))
+ (loop (+ i 1)))))))))
+
+(define (wrap proc wrap-proc)
+ (define (make-wrap element)
+ (let ((pointer
+ (cond ((pointer? element)
+ (if (= (pointer-address element) 0)
+ #f
+ element))
+ ((= element 0)
+ #f)
+ (else
+ (make-pointer element)))))
+ (cond (pointer
+ (wrap-proc pointer))
+ (else
+ #f))))
+ (lambda (alist)
+ (let ((res (proc alist)))
+ (cond ((list? res)
+ (map make-wrap res))
+ (else
+ (make-wrap res))))))
+
+(define (sized-string string-tag)
+ (lambda (alist)
+ (let ((s (assoc-ref alist string-tag)))
+ (cond (s
+ (bytevector->string
+ (u8-list->bytevector (list-head (cadr s) (car s)))
+ (fluid-ref %default-port-encoding)))
+ (else
+ #f)))))
+
+
+;;; Scenes
+
+(define-conversion-type parse-aiScene -> scene
+ (flags (field 'mFlags))
+ (root-node (wrap (field 'mRootNode) wrap-node))
+ (meshes (wrap (array 'mNumMeshes 'mMeshes) wrap-mesh))
+ (materials (wrap (array 'mNumMaterials 'mMaterials) wrap-material))
+ (animations (array 'mNumAnimations 'mAnimations))
+ (textures (array 'mNumTextures 'mTextures))
+ (lights (array 'mNumLights 'mLights))
+ (cameras (array 'mNumCameras 'mCameras)))
+
+ (define (load-scene filename flags)
+ (wrap-scene
+ (aiImportFile (string->pointer filename)
+ flags)))
+
+(export load-scene
+ scene?
+ scene-contents
+ scene-flags
+ scene-root-node
+ scene-meshes
+ scene-materials
+ scene-animations
+ scene-textures
+ scene-lights
+ scene-cameras)
+
+
+;;; Nodes
+
+(define-conversion-type parse-aiNode -> node
+ (name (sized-string 'mName))
+ (transformation (field 'mTransformation))
+ (parent (wrap (field 'mParent) wrap-node))
+ (children (wrap (array 'mNumChildren 'mChildren) wrap-node))
+ (meshes (array 'mNumMeshes 'mMeshes)))
+
+(export node?
+ node-contents
+ node-name
+ node-transformation
+ node-parent
+ node-children
+ node-meshes)
+
+
+;;; Meshes
+
+(define AI_MAX_NUMBER_OF_COLOR_SETS 8)
+
+(define-type mesh
+ (num-primitive-types (lambda (p) (bv-uint-ref p 0)))
+ (vertices (get-pointer-of-pointers 4 12))
+ (faces (get-structs-array 8 124 8 wrap-face))
+ (normals (lambda (p) (bv-uint-ref p 16)))
+ (tangents (lambda (p) (bv-uint-ref p 20)))
+ (bitangents (lambda (p) (bv-uint-ref p 24)))
+ (colors (lambda (p) (bv-uint-ref p 28))) ;AI_MAX_NUMBER_OF_COLOR_SETS
+ (texture-coords (lambda (p) (bv-uint-ref p 60))) ;AI_MAX_NUMBER_OF_TEXTURECOORDS
+ (num-uv-components (lambda (p) (bv-uint-ref p 92))) ;AI_MAX_NUMBER_OF_TEXTURECOORDS
+ (bones (get-pointer-of-pointers 128 132))
+ (material-index (lambda (p) (bv-uint-ref p 136))))
+
+(export mesh?
+ mesh-contents)
+
+
+;;; Materials
+
+(define-type material
+ (properties (get-pointer-of-pointers 4 0))
+ (allocated (lambda (p) (bv-uint-ref p 8))))
+
+(export material?
+ material-contents)
+
+
+;;; Faces
+
+(define-type face
+ (indices (get-array 0 4 'u32)))
+
+(export face?
+ face-contents)