yum-mirror/slang

Making it easier to work with shaders

git clone https://git.yummers.dev/yum-mirror/slang

Ellie HermaszewskaAdd support for bitfields (#3639)d979b5048

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1//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -output-using-type
2
3// CHECK:      123
4// CHECK-NEXT: 4567
5// CHECK-NEXT: 0
6// CHECK-NEXT: 0
7
8//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
9RWStructuredBuffer<uint> outputBuffer;
10
11struct S {
12    int foo : 8;
13    uint bar : 24;
14};
15
16// Generates the equivalent of this:
17/*
18struct S {
19    int _backing;
20
21    property foo : int
22    {
23        // int foo : 8;
24        get
25        {
26            let backingWidth = 32;
27            let fooWidth = 8;
28            let topOfFoo = 8;
29            // Shift left and then right to sign-extend foo properly
30            return (int(_backing) << (backingWidth-topOfFoo)) >> (backingWidth-fooWidth);
31        }
32        [mutating] set(int x)
33        {
34            let fooMask = 0x000000FF;
35            let bottomOfFoo = 0;
36            _backing = int((_backing & ~fooMask) | ((int(x) << bottomOfFoo) & fooMask));
37        }
38    }
39
40    // int bar : 24;
41    property bar : int
42    {
43        get
44        {
45            let backingWidth = 32;
46            let barWidth = 24;
47            let topOfBar = 32;
48            // Shift left and then right to sign-extend bar properly
49            return (uint(_backing) << (backingWidth-topOfBar)) >> (backingWidth-barWidth);
50        }
51        [mutating] set(int x)
52        {
53            let barMask = 0xFFFFFF00;
54            let bottomOfBar = 8;
55            _backing = int((_backing & ~barMask) | ((int(x) << bottomOfBar) & barMask));
56        }
57    }
58};
59*/
60
61[numthreads(1, 1, 1)]
62void computeMain()
63{
64    S s;
65    s.foo = 123;
66    s.bar = 4567;
67    outputBuffer[0] = s.foo;
68    outputBuffer[1] = s.bar;
69
70    s.foo = 0;
71    s.bar = 0;
72    outputBuffer[2] = s.foo;
73    outputBuffer[3] = s.bar;
74}