-
-
Notifications
You must be signed in to change notification settings - Fork 43
/
pixel-pipeline.lisp
196 lines (178 loc) · 9.77 KB
/
pixel-pipeline.lisp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
(in-package :trial)
(defun internal-format-unit (internal-format)
(case (internal-format-components internal-format)
(1 "float")
(2 "vec2")
(3 "vec3")
(4 "vec4")))
(defun compile-pixel-shader-preamble (ports)
(with-output-to-string (out)
(write-line "ivec2 uv;" out)
(loop with i = -1
for (kind name type) in ports
do (case kind
(:uniform
(format out "uniform ~(~a~) ~a;~%"
type (symbol->c-name name)))
(:input
(format out "uniform sampler2D ~a_tex;~%"
(symbol->c-name name)))
(:output
(format out "layout (location = ~d) out ~(~a~) ~a;~%"
(incf i)
(internal-format-unit type)
(symbol->c-name name)))))))
(defun compile-pixel-shader-main (ports)
(with-output-to-string (out)
(write-line "void main(){" out)
(write-line " uv = ivec2(gl_FragCoord.xy);" out)
(loop for (kind name type) in ports
do (case kind
(:input
(format out " ~a ~a = texelFetch(~:*~a_tex, uv, 0).~[~;x~;xy~;xyz~;xyzw~];~%"
(internal-format-unit type) (symbol->c-name name)
(internal-format-components type)))))
(format out " stage(~{~a~^, ~});~%"
(loop for (kind name type) in ports
when (find kind '(:input :output))
collect (symbol->c-name name)))
(write-line "}" out)))
(defmacro define-pixel-stage (name ports &body body)
(destructuring-bind (name &key (direct-superclasses '(post-effect-pass)) first iterate) (enlist name)
(form-fiddle:with-body-options (body options) body
`(progn
(define-shader-pass ,name ,direct-superclasses
,(loop with attachments = '(:color-attachment0 :color-attachment1 :color-attachment2 :color-attachment3
:color-attachment4 :color-attachment5 :color-attachment6 :color-attachment7)
for (kind name type . slot-args) in ports
collect `(,name
,@(ecase kind
(:uniform `(:port-type uniform-port))
(:input `(:port-type ,(if first 'static-input 'input) :texspec (:internal-format ,type)))
(:output `(:port-type output :texspec (:internal-format ,type)
:attachment ,(pop attachments)))
(:slot (list name type)))
,@slot-args))
(:inhibit-shaders (shader-entity :fragment-shader))
,@(loop for (k v) on options by #'cddr collect (cons k v)))
(define-class-shader (,name :fragment-shader)
,(compile-pixel-shader-preamble ports)
,@body
,(compile-pixel-shader-main ports))
,@(when iterate
(destructuring-bind (times (a b)) iterate
`((defmethod render ((pass ,name) (program shader-program))
(let ((in (gl-name (slot-value pass ',a)))
(out (gl-name (slot-value pass ',b)))
(unit-id (unit-id (port pass ',a)))
(attachment (attachment (port pass ',b)))
(times ,times))
(gl:active-texture unit-id)
(dotimes (i times)
(call-next-method)
(when (< i (1- times))
(rotatef in out)
(%gl:bind-texture :texture-2d in)
(%gl:framebuffer-texture :framebuffer attachment out 0)))
(setf (gl-name (slot-value pass ',a)) in)
(setf (gl-name (slot-value pass ',b)) out))))))))))
(defclass pixel-pipeline (pipeline)
((width :initarg :width :accessor width)
(height :initarg :height :accessor height)
(dirty-p :initform NIL :accessor dirty-p)))
(defmethod shared-initialize :after ((pipeline pixel-pipeline) slots &key)
(pack-pipeline pipeline T))
(defgeneric setup-pipeline (pixel-pipeline))
(defmethod pack-pipeline ((pipeline pixel-pipeline) (self (eql T)))
(setup-pipeline pipeline)
(pack-pipeline pipeline pipeline)
(loop for pass across (passes pipeline)
do (setf (clear-bits (framebuffer pass)) 0)))
(defmacro define-pixel-pipeline (pipeline-name slots &body body)
(form-fiddle:with-body-options (body others pool loopback accessors (struct (mksym *package* pipeline-name '-uniforms))) body
(let ((names (loop for i from 1 for pass in body
collect (mksym *package* pipeline-name '- i))))
(loop for (k) on others by #'cddr
do (error "Unknown option ~s" k))
`(progn
(define-gl-struct ,struct
,@(loop for (kind name type . args) in slots
when (eql :uniform kind)
collect `(,name ,type ,@args)))
(define-asset (,pool ,struct) uniform-block ',struct
:binding NIL)
,@(loop for pass in body
for name in names
for ports = (loop while (consp (car pass))
collect (pop pass))
collect (form-fiddle:with-body-options (body options) pass
`(define-pixel-stage (,name :first ,(eql name (first names)) ,@options)
,ports
:buffers ((,pool ,struct))
(gl-source (asset ',pool ',struct))
,@body)))
(defclass ,pipeline-name (pixel-pipeline)
,(loop for (kind . args) in slots
when (eql :slot kind)
collect args))
,@(loop for name in accessors
for i = (or (loop for pass in (reverse body)
for i downfrom (1- (length body))
do (when (loop for slot = (pop pass)
while (consp slot)
thereis (and (eql :output (first slot))
(eql name (second slot))))
(return i)))
(loop for pass in (reverse body)
for i from 0 below (length body)
do (when (loop for slot = (pop pass)
while (consp slot)
thereis (and (eql :input (first slot))
(eql name (second slot))))
(return i))))
collect `(defmethod ,name ((pipeline ,pipeline-name))
(slot-value (aref (passes pipeline) ,i) ',name)))
(defmethod setup-pipeline ((pipeline ,pipeline-name))
(let ,(loop for name in names
collect `(,name (make-instance ',name)))
,@(flet ((find-output-pass (slot-name pass-name)
(loop for i downfrom (position pass-name names) to 0
for pass = (nth i body)
do (when (loop for slot = (pop pass)
while (consp slot)
thereis (and (or (eql :output (first slot))
(eql i 0))
(eql slot-name (second slot))))
(return (nth i names))))))
(loop for name in (rest names)
for pass in (rest body)
append (loop for slot = (pop pass)
while (consp slot)
when (eql :input (first slot))
collect (let ((slot-name (second slot)))
`(connect
(port ,(find-output-pass slot-name name) ',slot-name)
(port ,name ',slot-name)
pipeline)))))))
(defmethod render :before ((pipeline ,pipeline-name) (target null))
(when (dirty-p pipeline)
(update-buffer-data (// ',pool ',struct) T)
(setf (dirty-p pipeline) NIL))
(let ((in (aref (passes pipeline) 0))
(out (aref (passes pipeline) (1- (length (passes pipeline))))))
(%gl:bind-framebuffer :framebuffer (gl-name (framebuffer out)))
,@(loop for (out in) in loopback
collect `(rotatef (gl-name (slot-value in ',in))
(gl-name (slot-value out ',out)))
collect `(%gl:framebuffer-texture
:framebuffer (attachment (port out ',out))
(gl-name (slot-value out ',out)) 0))))
,@(loop for (kind name type . args) in slots
when (eql :uniform kind)
collect `(defmethod ,name ((pipeline ,pipeline-name))
(with-buffer-tx (,pipeline-name (// ',pool ',struct) :update NIL)
(,name ,pipeline-name)))
collect `(defmethod (setf ,name) (value (pipeline ,pipeline-name))
(setf (dirty-p pipeline) T)
(with-buffer-tx (,pipeline-name (// ',pool ',struct) :update NIL)
(setf (,name ,pipeline-name) value))))))))