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shadow-map.lisp
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shadow-map.lisp
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(in-package #:org.shirakumo.fraf.kandria)
(define-shader-entity shadow-geometry (vertex-entity)
((caster :initarg :caster :initform (error "CASTER required"))))
(defmethod initialize-instance :after ((caster shadow-geometry) &key data)
(let* ((data (make-array (length data) :adjustable T :fill-pointer T :element-type 'single-float
:initial-contents data))
(vbo (make-instance 'vertex-buffer :data-usage :dynamic-draw :buffer-data data))
(vao (make-instance 'vertex-array :vertex-form :triangles
:bindings `((,vbo :size 2 :offset 0 :stride 8))
:size (/ (length data) 2))))
(setf (vertex-array caster) vao)))
(defmethod add-shadow-line ((vbo vertex-buffer) a b)
(let* ((data (buffer-data vbo)))
;; Vertices arranged in the following manner, such that
;; bottom vertices that should be moved are always at an
;; even modulus, for easy testing in the vertex shader.
;; 0 _1 2
;; _3 4 _5
(vector-push-extend (vx a) data)
(vector-push-extend (vy a) data)
(vector-push-extend (vx a) data)
(vector-push-extend (vy a) data)
(vector-push-extend (vx b) data)
(vector-push-extend (vy b) data)
(vector-push-extend (vx b) data)
(vector-push-extend (vy b) data)
(vector-push-extend (vx b) data)
(vector-push-extend (vy b) data)
(vector-push-extend (vx a) data)
(vector-push-extend (vy a) data)))
(defmethod apply-transforms progn ((caster shadow-geometry))
(apply-transforms (slot-value caster 'caster)))
(defmethod render :around ((caster shadow-geometry) (program shader-program))
(let* ((caster (slot-value caster 'caster))
(bsize (bsize caster)))
;; We fade the caster a bit in order to ensure shadows can cast onto other chunks.
(let* ((camera (camera +world+))
(view (in-view-tester camera))
(diff (* 0.5 (+ 600 (- (vz view) (vx view))))))
(setf (uniform program "strength") (- 1.0 (clamp 0.0 (/ (- (abs (- (vx (location camera)) (vx (location caster)))) (vx bsize)) diff) 1.0)))
(call-next-method))))
(defclass shadow-caster ()
((shadow-geometry :accessor shadow-geometry)))
(defmethod initialize-instance ((caster shadow-caster) &key)
(call-next-method)
(setf (shadow-geometry caster) (make-instance 'shadow-geometry :caster caster)))
(defmethod stage :after ((caster shadow-caster) (area staging-area))
(stage (shadow-geometry caster) area))
(defgeneric compute-shadow-geometry (caster geometry))
(defmethod compute-shadow-geometry ((caster shadow-caster) (_ (eql T)))
(compute-shadow-geometry caster (shadow-geometry caster)))
(defmethod compute-shadow-geometry ((caster shadow-caster) (geometry shadow-geometry))
(compute-shadow-geometry caster (caar (bindings (vertex-array geometry)))))
(defmethod compute-shadow-geometry :after (caster (vbo vertex-buffer))
(when (allocated-p vbo)
(with-eval-in-render-loop (+world+)
(resize-buffer-data vbo (* 4 (length (buffer-data vbo))) :data (buffer-data vbo)))))
(defmethod compute-shadow-geometry :after (caster (geometry shadow-geometry))
(setf (size (vertex-array geometry))
(/ (length (buffer-data (caar (bindings (vertex-array geometry))))) 2)))
(define-shader-pass shadow-map-pass (per-object-pass single-shader-pass)
((name :initform 'shadow-map-pass)
(shadow-map :port-type output :texspec (:internal-format :r8))
(local-shade :initform 0.0 :accessor local-shade)
(fc :initform 0 :accessor fc))
(:buffers (kandria gi)))
(defmethod object-renderable-p ((object renderable) (pass shadow-map-pass)) NIL)
(defmethod object-renderable-p ((object shadow-caster) (pass shadow-map-pass)) T)
(defmethod object-renderable-p ((object shadow-geometry) (pass shadow-map-pass)) T)
(defmethod construct-frame ((pass shadow-map-pass))
(let* ((frame (frame pass))
(index 0)
(total (array-total-size frame))
(renderable-table (trial::renderable-table pass)))
(flet ((store (object program)
(when (<= total (incf index))
(adjust-array frame (* 2 total))
(loop for i from total below (* 2 total)
do (setf (aref frame i) (cons NIL NIL)))
(setf total (* 2 total)))
(let ((entry (aref frame (1- index))))
(setf (car entry) object)
(setf (cdr entry) program))))
(when (region +world+)
(let ((container (tvec 0 0 0 0)))
(v<- container (in-view-tester (camera +world+)))
(decf (vx container) 300)
(decf (vy container) 300)
(incf (vz container) 300)
(incf (vw container) 300)
(do-fitting (object (bvh (region +world+)) container)
(let* ((object (when (typep object 'shadow-caster)
(shadow-geometry object)))
(program (gethash object renderable-table)))
(when program
(store object program)))))))
(setf (fill-pointer frame) index)
frame))
(defmethod enter ((caster shadow-caster) (pass shadow-map-pass))
(enter (shadow-geometry caster) pass))
(defmethod leave ((caster shadow-caster) (pass shadow-map-pass))
(leave (shadow-geometry caster) pass))
(defmethod render ((pass shadow-map-pass) target)
(when (setting :display :shadows)
(call-next-method)))
(defmethod render :before ((pass shadow-map-pass) target)
(gl:blend-func :src-alpha :one)
(gl:clear-color 0 0 0 0))
(defmethod render :after ((pass shadow-map-pass) target)
(gl:blend-func :src-alpha :one-minus-src-alpha)
(let ((player (unit 'player T)))
(setf (fc pass) (mod (+ (fc pass) 1) 60))
(when (and player (= 0 (fc pass)))
(let* ((pos (m* (projection-matrix) (view-matrix) (vec (vx (location player)) (+ (vy (location player)) 8) 0 1)))
(px (nv/ (nv+ pos 1) 2)))
(gl:bind-framebuffer :read-framebuffer (gl-name (framebuffer pass)))
(cffi:with-foreign-object (pixel :uint8)
(%gl:read-pixels (floor (clamp 0 (* (vx px) (width pass)) (1- (width pass))))
(floor (clamp 0 (* (vy px) (height pass)) (1- (height pass))))
1 1 :red :unsigned-byte pixel)
(setf (local-shade pass) (/ (cffi:mem-ref pixel :uint8) 256.0)))))))
(defmethod force-lighting ((pass shadow-map-pass))
(setf (fc pass) 59))
(defmethod handle ((ev force-lighting) (pass shadow-map-pass))
(force-lighting pass))
(define-class-shader (shadow-map-pass :vertex-shader)
"layout(location = 0) in vec2 vertex_position;
uniform mat4 model_matrix;
uniform mat4 view_matrix;
uniform mat4 projection_matrix;
void main(){
maybe_call_next_method();
vec2 vertex = (model_matrix * vec4(vertex_position, 0, 1)).xy;
if(gl_VertexID % 2 != 0){
vec2 direction = normalize(gi.location - vertex);
vertex = vertex - direction*100000;
}
gl_Position = projection_matrix * view_matrix * vec4(vertex, 0, 1);
}")
(define-class-shader (shadow-map-pass :fragment-shader)
"out vec4 color;
uniform float strength = 1.0;
void main(){
maybe_call_next_method();
color = vec4(0.5*strength,0.0,0.0,1.0);
}")