/
Splitter.hx
310 lines (284 loc) · 7.69 KB
/
Splitter.hx
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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
package hxsl;
using hxsl.Ast;
private class VarProps {
public var origin : TVar;
public var v : TVar;
public var read : Int;
public var write : Int;
public var local : Bool;
public var requireInit : Bool;
public function new(v) {
this.v = v;
read = 0;
write = 0;
}
}
class Splitter {
var vars : Map<Int,VarProps>;
var varNames : Map<String,TVar>;
var varMap : Map<TVar,TVar>;
public function new() {
}
public function split( s : ShaderData ) : Array<ShaderData> {
var vfun = null, vvars = new Map();
var ffun = null, fvars = new Map();
var isCompute = false;
varNames = new Map();
varMap = new Map();
for( f in s.funs )
switch( f.kind ) {
case Vertex, Main:
vars = vvars;
vfun = f;
checkExpr(f.expr);
if( f.kind == Main ) isCompute = true;
case Fragment:
vars = fvars;
ffun = f;
checkExpr(f.expr);
default:
throw "assert";
}
var vafterMap = [];
for( inf in Lambda.array(vvars) ) {
var v = inf.v;
if( inf.local ) continue;
switch( v.kind ) {
case Var, Local:
var fv = fvars.get(inf.origin.id);
v.kind = fv != null && fv.read > 0 ? Var : Local;
default:
}
switch( v.kind ) {
case Var, Output:
// alloc a new var if read or multiple writes
if( inf.read > 0 || inf.write > 1 ) {
var nv : TVar = {
id : Tools.allocVarId(),
name : v.name,
kind : Local,
type : v.type,
};
uniqueName(nv);
varMap.set(inf.origin, nv);
var ninf = new VarProps(nv);
ninf.read++;
vvars.set(nv.id, ninf);
var p = vfun.expr.p;
var e = { e : TBinop(OpAssign, { e : TVar(v), t : nv.type, p : p }, { e : TVar(nv), t : v.type, p : p } ), t : nv.type, p : p };
vafterMap.push(() -> addExpr(vfun, e));
if( v.kind == Var )
vafterMap.push(() -> varMap.set(inf.origin, v)); // restore
}
default:
}
}
// perform a first mapVars before we map fragment shader vars
vfun = {
ret : vfun.ret,
ref : vfun.ref,
kind : vfun.kind,
args : vfun.args,
expr : mapVars(vfun.expr),
};
for( f in vafterMap )
f();
var finits = [];
var todo = [];
for( inf in fvars ) {
var v = inf.v;
switch( v.kind ) {
case Input:
// create a var that will pass the input from vertex to fragment
var nv : TVar = {
id : Tools.allocVarId(),
name : v.name,
kind : Var,
type : v.type,
};
uniqueName(nv);
var i = vvars.get(inf.origin.id);
if( i == null ) {
i = new VarProps(v);
vvars.set(inf.origin.id, i);
}
i.read++;
varMap.set(inf.origin, nv);
var ninf = new VarProps(nv);
ninf.origin = inf.origin;
// make sure it's listed in variables
fvars.set(inf.origin.id, ninf);
vvars.set(nv.id, ninf);
addExpr(vfun, { e : TBinop(OpAssign, { e : TVar(nv), t : v.type, p : vfun.expr.p }, { e : TVar(v), t : v.type, p : vfun.expr.p } ), t : v.type, p : vfun.expr.p } );
case Var if( inf.write > 0 ):
// prevent error when writing to a varying
var nv : TVar = {
id : Tools.allocVarId(),
name : v.name,
kind : Local,
type : v.type,
};
uniqueName(nv);
finits.push( { e : TVarDecl(nv, { e : TVar(v), t : v.type, p : ffun.expr.p } ), t:TVoid, p:ffun.expr.p } );
varMap.set(inf.origin, nv);
default:
}
}
// final check
for( v in vvars )
checkVar(v, true, vvars, vfun.expr.p);
for( v in fvars )
checkVar(v, false, vvars, ffun.expr.p);
if( ffun != null ) {
ffun = {
ret : ffun.ret,
ref : ffun.ref,
kind : ffun.kind,
args : ffun.args,
expr : mapVars(ffun.expr),
};
switch( ffun.expr.e ) {
case TBlock(el):
for( e in finits )
el.unshift(e);
default:
finits.push(ffun.expr);
ffun.expr = { e : TBlock(finits), t : TVoid, p : ffun.expr.p };
}
}
var vvars = [for( v in vvars ) if( !v.local ) v];
var fvars = [for( v in fvars ) if( !v.local ) v];
// make sure we sort the inputs the same way they were sent in
inline function getId(v:VarProps) return v.origin == null ? v.v.id : v.origin.id;
vvars.sort(function(v1, v2) return getId(v1) - getId(v2));
fvars.sort(function(v1, v2) return getId(v1) - getId(v2));
return isCompute ? [
{
name : "main",
vars : [for( v in vvars ) v.v],
funs : [vfun],
}
] : [
{
name : "vertex",
vars : [for( v in vvars ) v.v],
funs : [vfun],
},
{
name : "fragment",
vars : [for( v in fvars ) v.v],
funs : [ffun],
}
];
}
function addExpr( f : TFunction, e : TExpr ) {
switch( f.expr.e ) {
case TBlock(el):
el.push(e);
default:
f.expr = { e : TBlock([f.expr, e]), t : TVoid, p : f.expr.p };
}
}
function checkVar( v : VarProps, vertex : Bool, vvars : Map<Int,VarProps>, p ) {
switch( v.v.kind ) {
case Local if( v.requireInit ):
throw new Error("Variable " + v.v.name + " is used without being initialized", p);
case Var:
if( !vertex ) {
var i = vvars.get(v.origin.id);
if( i != null && i.v.kind == Input ) return;
if( i == null || i.write == 0 ) throw new Error("Varying " + v.v.name + " is not written by vertex shader",p);
}
default:
}
}
function mapVars( e : TExpr ) {
return switch( e.e ) {
case TVar(v):
var v2 = varMap.get(v);
v2 == null ? e : { e : TVar(v2), t : e.t, p : e.p };
case TVarDecl(v, init):
var v2 = varMap.get(v);
v2 == null ? e.map(mapVars) : { e : TVarDecl(v2,init == null ? null : mapVars(init)), t : e.t, p : e.p };
case TFor(v, it, loop):
var v2 = varMap.get(v);
v2 == null ? e.map(mapVars) : { e : TFor(v2,mapVars(it),mapVars(loop)), t : e.t, p : e.p };
default:
e.map(mapVars);
}
}
function get( v : TVar ) {
var i = vars.get(v.id);
if( i == null ) {
var nv = varMap.get(v);
if( nv == null ) {
if( v.kind == Global || v.kind == Output || v.kind == Input )
nv = v;
else {
nv = {
id : Tools.allocVarId(),
name : v.name,
kind : v.kind,
type : v.type,
};
if( v.qualifiers != null && v.qualifiers.indexOf(Final) >= 0 )
nv.qualifiers = [Final];
uniqueName(nv);
}
varMap.set(v,nv);
}
i = new VarProps(nv);
i.origin = v;
vars.set(v.id, i);
}
return i;
}
function uniqueName( v : TVar ) {
if( v.kind == Global || v.kind == Output || v.kind == Input )
return;
var n = varNames.get(v.name);
if( n != null && n != v ) {
var prefix = v.name;
while( prefix.charCodeAt(prefix.length - 1) >= '0'.code && prefix.charCodeAt(prefix.length - 1) <= '9'.code )
prefix = prefix.substr(0, -1);
var k = prefix == v.name ? 2 : Std.parseInt(v.name.substr(prefix.length));
while( varNames.exists(prefix + k) )
k++;
v.name = prefix + k;
}
varNames.set(v.name, v);
}
function checkExpr( e : TExpr ) {
switch( e.e ) {
case TVar(v):
var inf = get(v);
if( inf.write == 0 ) inf.requireInit = true;
inf.read++;
case TBinop(OpAssign, { e : (TVar(v) | TSwiz( { e : TVar(v) }, _)) }, e):
var inf = get(v);
inf.write++;
checkExpr(e);
case TBinop(OpAssignOp(_), { e : (TVar(v) | TSwiz( { e : TVar(v) }, _)) }, e):
var inf = get(v);
if( inf.write == 0 ) inf.requireInit = true;
inf.read++;
inf.write++;
checkExpr(e);
case TVarDecl(v, init):
var inf = get(v);
inf.local = true;
if( init != null ) {
checkExpr(init);
inf.write++;
}
case TFor(v, it, loop):
checkExpr(it);
var inf = get(v);
inf.local = true;
inf.write++;
checkExpr(loop);
default:
e.iter(checkExpr);
}
}
}