yum-mirror/slang

Making it easier to work with shaders

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

Ellie Hermaszewskamsvc style bitfield packing (#7963)66301ab90

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1//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -output-using-type -compile-arg -msvc-style-bitfield-packing
2
3// MSVC packing with mixed type sizes
4// CHECK:      15
5// CHECK-NEXT: 255
6// CHECK-NEXT: 4095
7// CHECK-NEXT: 8
8
9//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
10RWStructuredBuffer<uint> outputBuffer;
11
12struct MixedTypes {
13    uint8_t a : 4;   // Uses uint8_t backing, bits 7-4
14    uint8_t b : 4;   // Same backing, bits 3-0
15    uint16_t c : 8;  // New uint16_t backing due to type change, bits 15-8
16    uint16_t d : 8;  // Same backing, bits 7-0
17    uint32_t e : 12; // New uint32_t backing due to type change, bits 31-20
18    uint32_t f : 12; // Same backing, bits 19-8
19    uint32_t g : 8;  // Same backing, bits 7-0
20};
21
22[numthreads(1, 1, 1)]
23void computeMain()
24{
25    MixedTypes m;
26    m.a = 15;   // 0xF
27    m.b = 15;   // 0xF
28    m.c = 255;  // 0xFF
29    m.d = 255;  // 0xFF
30    m.e = 4095; // 0xFFF
31    m.f = 4095; // 0xFFF
32    m.g = 255;  // 0xFF
33
34    outputBuffer[0] = m.a;
35    outputBuffer[1] = m.c;
36    outputBuffer[2] = m.e;
37    // Verify struct size includes all three backing fields
38    outputBuffer[3] = sizeof(MixedTypes);
39}
40