skia2/resources/sksl/shared/StructsInFunctions.sksl
John Stiles d47330feed Add support for struct constructors to SkSL.
This is allowed in OpenGL ES2, and its absence in SkSL has been a pain
point for new users adopting Runtime Effects.

Change-Id: Id2ed78261a2cd2b14b49ad22cb74cdc9e0905f8a
Bug: skia:11368
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/393418
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
2021-04-09 13:54:16 +00:00

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/*#pragma settings NoInline*/
uniform half4 colorRed, colorGreen;
struct S { float x; int y; };
struct Nested { S a, b; };
S returns_a_struct() {
S s;
s.x = 1;
s.y = 2;
return s;
}
S constructs_a_struct() {
return S(2, 3);
}
float accepts_a_struct(S s) {
return s.x + float(s.y);
}
void modifies_a_struct(inout S s) {
s.x++;
s.y++;
}
half4 main() {
S s = returns_a_struct();
float x = accepts_a_struct(s);
modifies_a_struct(s);
S expected = constructs_a_struct();
Nested n1, n2, n3;
n1.a = n1.b = returns_a_struct();
n3 = n2 = n1;
modifies_a_struct(n3.b);
bool valid = (x == 3) && (s.x == 2) && (s.y == 3) &&
(s == expected) && (s == S(2, 3)) && (s != returns_a_struct()) &&
(n1 == n2) && (n1 != n3) && (n3 == Nested(S(1, 2), S(2, 3)));
return valid ? colorGreen : colorRed;
}