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camera.lisp
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camera.lisp
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(in-package #:org.shirakumo.fraf.trial)
(defclass camera (located-entity listener)
((name :initform :camera)
(location :initform (vec 0 30 200))
(near-plane :initarg :near-plane :initform 0.1f0 :accessor near-plane)
(far-plane :initarg :far-plane :initform 10000.0f0 :accessor far-plane)
(bsize :initform (vec2 0 0) :accessor bsize)))
(defgeneric project-view (camera))
(defgeneric setup-perspective (camera width height))
(defgeneric map-visible (function camera container))
(defgeneric in-view-p (object camera))
(defgeneric focal-point (camera))
(defgeneric screen-area (thing camera))
(defmethod width ((camera camera))
(* 2 (vx (bsize camera))))
(defmethod height ((camera camera))
(* 2 (vy (bsize camera))))
(defmethod handle ((ev tick) (camera camera))
(project-view camera))
(defmethod handle ((ev resize) (camera camera))
(vsetf (bsize camera) (* 0.5 (width ev)) (* 0.5 (height ev)))
(setup-perspective camera (width ev) (height ev)))
(defmethod (setf near-plane) :after (val (camera camera))
(setup-perspective camera))
(defmethod (setf far-plane) :after (val (camera camera))
(setup-perspective camera))
(defmethod setup-perspective :before ((camera camera) w h)
(reset-matrix *projection-matrix*))
(defmethod project-view :before ((camera camera))
(reset-matrix))
(defmethod map-visible (function (camera camera) (object scene-node))
(when (in-view-p object camera)
(funcall function object)))
(defmethod map-visible (function (camera camera) (container container))
(do-scene-graph (object container)
(when (in-view-p object camera)
(funcall function object))))
(defmethod map-visible (function (camera null) (container container))
(do-scene-graph (object container)
(funcall function object)))
(defmacro do-visible ((entity camera container &optional return) &body body)
`(block NIL
(map-visible (lambda (,entity) ,@body) ,camera ,container)
,return))
(defmethod in-view-p (object (camera camera)) T)
(defmethod in-view-p (object (standard (eql T)))
(in-view-p object (camera (scene +main+))))
(defclass 2d-camera (camera)
((near-plane :initform 0.0)
(far-plane :initform 100.0)
(location :initform (vec 0 0 200))))
(defmethod setup-perspective ((camera 2d-camera) width height)
(orthographic-projection 0 (max 1 width) 0 (max 1 height) (near-plane camera) (far-plane camera)))
(defmethod project-view ((camera 2d-camera))
(reset-matrix *view-matrix*)
(translate (v- (location camera)) *view-matrix*))
(defmethod screen-area ((null null) (camera 2d-camera))
(let ((bsize (bsize camera)))
(* (vx bsize) (vy bsize) 4)))
(defmethod screen-area ((entity sized-entity) (camera 2d-camera))
(* (vx (bsize entity)) (vy (bsize entity))))
(defmethod in-view-p ((entity sized-entity) (camera 2d-camera))
(let ((eloc (global-location entity))
(esiz (global-bsize entity))
(cloc (location camera))
(csiz (bsize camera)))
(and (<= (abs (- (vx eloc) (vx cloc))) (+ (vx esiz) (vx csiz)))
(<= (abs (- (vy eloc) (vy cloc))) (+ (vy esiz) (vy csiz))))))
(defmethod in-view-p ((entity global-bounds-cached-entity) (camera 2d-camera))
(let ((eloc (global-location entity))
(esiz (global-bsize entity))
(cloc (location camera))
(csiz (bsize camera)))
(and (<= (abs (- (vx eloc) (vx cloc))) (+ (vx esiz) (vx csiz)))
(<= (abs (- (vy eloc) (vy cloc))) (+ (vy esiz) (vy csiz))))))
(defclass sidescroll-camera (2d-camera)
((zoom :initarg :zoom :initform 1.0 :accessor zoom)
(target :initarg :target :initform (vec 0 0 200) :accessor target)))
(defmethod project-view ((camera sidescroll-camera))
(let* ((z (zoom camera))
(v (vxy_ (bsize camera))))
(declare (dynamic-extent v))
(reset-matrix *view-matrix*)
(scale-by z z z *view-matrix*)
(translate (nv- (nv/ v z) (location camera)) *view-matrix*)))
(defmethod focal-point ((camera sidescroll-camera))
(global-location (target camera)))
(define-handler ((camera sidescroll-camera) tick) ()
(project-view camera)
(let* ((loc (location camera))
(int (vcopy loc)))
(when (target camera)
(let ((tar (location (target camera))))
(vsetf int (round (vx tar)) (round (vy tar)) (vz loc))))
(let* ((dir (v- int loc))
(len (max 1 (vlength dir)))
(ease (clamp 0 (+ 0.2 (/ (expt len 1.4) 100)) 20)))
(nv* dir (/ ease len))
(nv+ loc dir))))
;; TODO: implement in-view-p respective to zoom
(defclass 3d-camera (camera)
((fov :initarg :fov :initform 75.0 :accessor fov)
(frustum :initform (make-perspective-box 1.0 1.0 0.1 1.0) :accessor frustum)))
(defmethod (setf fov) :after (val (camera 3d-camera))
(let ((bsize (bsize camera)))
(setup-perspective camera (max 1 (vx bsize)) (max 1 (vy bsize)))))
(defmethod setup-perspective ((camera 3d-camera) width height)
(perspective-projection (fov camera) (/ (max 1 width) (max 1 height)) (near-plane camera) (far-plane camera))
(setf (frustum camera) (make-perspective-box (fov camera) (/ (max 1 width) (max height)) (near-plane camera) (far-plane camera))))
(defmethod focal-point ((camera 3d-camera))
#.(vec 0 0 0))
(defmethod project-view ((camera 3d-camera))
(look-at (location camera) (vec 0 0 0) +vy3+))
(defmethod screen-area ((null null) (camera 3d-camera))
(let ((x (* 2 (near-plane camera) (tan (* 0.5 (fov camera)))))
(bsize (bsize camera)))
(/ (* x x) (/ (vx bsize) (vy bsize)))))
;; FIXME: Test this stuff
(defmethod screen-area ((entity sized-entity) (camera 3d-camera))
(with-vec (x y z) (the *vec3 (bsize entity))
(let ((p1 (vec (- x) (- y) (- z)))
(p2 (vec (+ x) (- y) (- z))) ; p7 -- p8
(p3 (vec (- x) (+ y) (- z))) ; /| / |
(p4 (vec (+ x) (+ y) (- z))) ; p3 -- p4 |
(p5 (vec (- x) (- y) (+ z))) ; | p5 --|p6
(p6 (vec (+ x) (- y) (+ z))) ; |/ |/
(p7 (vec (- x) (+ y) (+ z))) ; p1 -- p2
(p8 (vec (+ x) (+ y) (+ z))))
(declare (dynamic-extent p1 p2 p3 p4 p5 p6 p7 p8))
(let* ((matrix (meye 4))
(*model-matrix* matrix))
(declare (dynamic-extent matrix))
(apply-transforms entity)
(n*m *view-matrix* matrix)
(n*m *projection-matrix* matrix)
(n*m matrix p1) (n*m matrix p2) (n*m matrix p3) (n*m matrix p4)
(n*m matrix p5) (n*m matrix p6) (n*m matrix p7) (n*m matrix p8)
(let ((f1 (vlength (vc (v- p2 p1) (v- p3 p1))))
(f2 (vlength (vc (v- p7 p3) (v- p4 p3))))
(f3 (vlength (vc (v- p7 p5) (v- p6 p5))))
(f4 (vlength (vc (v- p5 p1) (v- p2 p1))))
(f5 (vlength (vc (v- p4 p2) (v- p6 p2))))
(f6 (vlength (vc (v- p3 p1) (v- p5 p1)))))
(* 0.5 (+ f1 f2 f3 f4 f5 f6)))))))
(defmethod in-view-p ((entity sized-entity) (camera 3d-camera))
T
#++
(let ((box (make-box :bsize (bsize entity))))
(declare (dynamic-extent box))
(let* ((matrix (meye 4))
(*model-matrix* matrix))
(declare (dynamic-extent matrix))
(apply-transforms entity)
(n*m *view-matrix* matrix)
(!m* (primitive-transform box) matrix (primitive-local-transform box))
(intersects-p box (frustum camera)))))
(defmethod screen-area ((entity global-bounds-cached-entity) (camera 3d-camera))
(with-vec (x y z) (the *vec3 (global-bsize entity))
(let ((p1 (vec (- x) (- y) (- z)))
(p2 (vec (+ x) (- y) (- z))) ; p7 -- p8
(p3 (vec (- x) (+ y) (- z))) ; /| / |
(p4 (vec (+ x) (+ y) (- z))) ; p3 -- p4 |
(p5 (vec (- x) (- y) (+ z))) ; | p5 --|p6
(p6 (vec (+ x) (- y) (+ z))) ; |/ |/
(p7 (vec (- x) (+ y) (+ z))) ; p1 -- p2
(p8 (vec (+ x) (+ y) (+ z))))
(declare (dynamic-extent p1 p2 p3 p4 p5 p6 p7 p8))
(let* ((matrix (mtranslation (global-location entity))))
(declare (dynamic-extent matrix))
(n*m *view-matrix* matrix)
(n*m *projection-matrix* matrix)
(n*m matrix p1) (n*m matrix p2) (n*m matrix p3) (n*m matrix p4)
(n*m matrix p5) (n*m matrix p6) (n*m matrix p7) (n*m matrix p8)
(let ((f1 (vlength (vc (v- p2 p1) (v- p3 p1))))
(f2 (vlength (vc (v- p7 p3) (v- p4 p3))))
(f3 (vlength (vc (v- p7 p5) (v- p6 p5))))
(f4 (vlength (vc (v- p5 p1) (v- p2 p1))))
(f5 (vlength (vc (v- p4 p2) (v- p6 p2))))
(f6 (vlength (vc (v- p3 p1) (v- p5 p1)))))
(* 0.5 (+ f1 f2 f3 f4 f5 f6)))))))
(defmethod in-view-p ((entity global-bounds-cached-entity) (camera 3d-camera))
T
#++
(let ((box (make-box :bsize (global-bsize entity) :location (global-location entity))))
(declare (dynamic-extent box))
(!m* (primitive-transform box) *view-matrix* (primitive-local-transform box))
(intersects-p box (frustum camera))))
(defclass target-camera (3d-camera)
((target :initarg :target :initform (vec3 0) :accessor target)
(up :initarg :up :initform +vy3+ :accessor up)))
(defmethod project-view ((camera target-camera))
(let ((matrix (meye 4))
(loc (vec3))
(tar (v- (target camera) (location camera))))
(declare (dynamic-extent matrix loc tar))
(global-transform-matrix camera matrix)
(mcol3 matrix 3 loc)
(n*m matrix tar)
(look-at loc tar (up camera))))
(defmethod focal-point ((camera target-camera))
(global-location (target camera)))
(defclass pivot-camera (target-camera)
((rotation :initform (quat) :accessor rotation)
(radius :initform 1.0 :initarg :radius :accessor radius)))
(defmethod initialize-instance :after ((camera pivot-camera) &key)
(setf (rotation camera) (rotation camera)))
(defmethod (setf rotation) :after (r (camera pivot-camera))
(vsetf (location camera) (radius camera) 0 0)
(!q* (location camera) (rotation camera) (location camera)))
(define-handler (pivot-camera mouse-move) (old-pos pos)
;; FIXME: this isn't right yet.
(when (or (retained :middle)
(retained :left-control))
(let ((dp (vyx (v- pos old-pos)))
(rot (rotation pivot-camera)))
(nq* rot (qfrom-angle +vx+ (* -0.01 (vx dp))))
(nq* rot (qfrom-angle +vy+ (* -0.01 (vy dp))))
(setf (rotation pivot-camera) rot))))
(defclass following-camera (target-camera)
((target :initform NIL)))
(defmethod project-view ((camera following-camera))
(when (target camera)
(look-at (v+ (location camera)
(location (target camera)))
(location (target camera))
(up camera))))
(defclass fps-camera (3d-camera)
((rotation :initarg :rotation :initform (vec 0 0 0) :accessor rotation)
(x-acceleration :initarg :x-acceleration :initform 0.01 :accessor x-acceleration)
(y-acceleration :initarg :y-acceleration :initform 0.01 :accessor y-acceleration)))
(defmethod project-view ((camera fps-camera))
(reset-matrix (view-matrix))
(rotate +vx+ (vx (rotation camera)) (view-matrix))
(rotate +vy+ (vy (rotation camera)) (view-matrix))
(with-vec (x y z) (the vec3 (location camera))
(translate-by (- x) (- y) (- z) (view-matrix))))
(defun do-fps-movement (camera old-pos pos)
(let ((delta (v- pos old-pos)))
(setf (vx delta) (* (vx delta) (x-acceleration camera)))
(setf (vy delta) (* (vy delta) (y-acceleration camera)))
(nv+ (rotation camera) (vyx_ delta))
(nvmod (rotation camera) (* 2 PI))))
(define-handler (fps-camera mouse-move) (old-pos pos)
(do-fps-movement fps-camera old-pos pos))
(defmethod focal-point ((camera fps-camera))
;; KLUDGE: not really accurate. Should be somewhere in front of the camera.
(location camera))
(defclass freeroam-camera (fps-camera)
((move-speed :initarg :move-speed :initform 1.0 :accessor move-speed)))
(define-handler (freeroam-camera tick :after) ()
(let* ((loc (location freeroam-camera))
(rot (rotation freeroam-camera))
(speed (* (move-speed freeroam-camera)
(if (retained :left-shift) 5 1)
(if (retained :left-alt) 1/5 1))))
(cond ((retained :a)
(decf (vx loc) (* speed (cos (vy rot))))
(decf (vz loc) (* speed (sin (vy rot)))))
((retained :d)
(incf (vx loc) (* speed (cos (vy rot))))
(incf (vz loc) (* speed (sin (vy rot))))))
(cond ((retained :w)
(incf (vx loc) (* speed (sin (vy rot))))
(decf (vz loc) (* speed (cos (vy rot))))
(decf (vy loc) (* speed (sin (vx rot)))))
((retained :s)
(decf (vx loc) (* speed (sin (vy rot))))
(incf (vz loc) (* speed (cos (vy rot))))
(incf (vy loc) (* speed (sin (vx rot))))))
(cond ((retained :space)
(incf (vy loc) speed))
((retained :c)
(decf (vy loc) speed)))))
(defclass editor-camera (freeroam-camera)
())
(define-handler (editor-camera mouse-move) (old-pos pos)
(when (or (retained :middle)
(retained :left-control))
(do-fps-movement editor-camera old-pos pos)))