yum-mirror/slang

Making it easier to work with shaders

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

Jay KwakPrepare VulkanSDK release Oct 2025 (#8525)db44c1b73

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3.1 KiB105 linesraw
1//TEST:SIMPLE(filecheck=HULL):   -target spirv -stage hull   -entry hullMain
2//TEST:SIMPLE(filecheck=DOMAIN): -target spirv -stage domain -entry domainMain
3//TEST:SIMPLE(filecheck=DEBUGINFO): -target spirv -g2 -O0 -stage hull   -entry hullMain
4//TEST:SIMPLE(filecheck=DEBUGINFO): -target spirv -g2 -O0 -stage domain -entry domainMain
5
6// HULL-DAG: OpExecutionMode %hullMain SpacingEqual
7// HULL-DAG: OpExecutionMode %hullMain OutputVertices 4
8// HULL-DAG: OpExecutionMode %hullMain VertexOrderCw
9// HULL-DAG: OpExecutionMode %hullMain Quads
10
11// HULL: OpDecorate %gl_TessLevelOuter BuiltIn TessLevelOuter
12// HULL: OpDecorate %gl_TessLevelOuter Patch
13// HULL: OpDecorate %gl_TessLevelInner BuiltIn TessLevelInner
14// HULL: OpDecorate %gl_TessLevelInner Patch
15
16// HULL: OpControlBarrier %uint_2 %uint_4 %uint_0
17
18// HULL: OpStore %gl_TessLevelOuter
19// HULL: OpStore %gl_TessLevelInner
20
21// DOMAIN-DAG: OpExecutionMode %domainMain SpacingEqual
22// DOMAIN-DAG: OpExecutionMode %domainMain Quads
23
24// Entry point params should be emitted as local-variable debug info
25// DEBUGINFO: %[[patchStr:[0-9]+]] = OpString "patch"
26// DEBUGINFO: %[[patchId:[a-zA-Z0-9_]+]] = {{.*}} DebugLocalVariable %[[patchStr]]
27// DEBUGINFO: DebugValue %[[patchId]]
28
29struct VS_OUT
30{
31    float3 position : POSITION;
32};
33
34struct HS_OUT
35{
36    float3 position : POSITION;
37};
38
39struct HSC_OUT
40{
41    float EdgeTessFactor[4] : SV_TessFactor;
42    float InsideTessFactor[2] : SV_InsideTessFactor;
43};
44
45struct DS_OUT
46{
47    float4 position : SV_Position;
48};
49
50// Hull Shader (HS)
51[domain("quad")]
52[partitioning("integer")]
53[outputtopology("triangle_cw")]
54[outputcontrolpoints(4)]
55[patchconstantfunc("constants")]
56HS_OUT hullMain(InputPatch<VS_OUT, 4> patch, uint i : SV_OutputControlPointID)
57{
58    HS_OUT o;
59    o.position = patch[i].position;
60    return o;
61}
62
63HSC_OUT constants(InputPatch<VS_OUT, 4> patch)
64{
65    float3 p0 = patch[0].position;
66    float3 p1 = patch[1].position;
67    float3 p2 = patch[2].position;
68    float3 p3 = patch[3].position;
69
70    HSC_OUT o;
71    o.EdgeTessFactor[0] = dot(p0, p1);
72    o.EdgeTessFactor[1] = dot(p0, p3);
73    o.EdgeTessFactor[2] = dot(p2, p3);
74    o.EdgeTessFactor[3] = dot(p1, p2);
75    o.InsideTessFactor[0] = lerp(o.EdgeTessFactor[1], o.EdgeTessFactor[3], 0.5);
76    o.InsideTessFactor[1] = lerp(o.EdgeTessFactor[0], o.EdgeTessFactor[2], 0.5);
77    return o;
78}
79
80[domain("quad")]
81DS_OUT domainMain(
82    float2 uv : SV_DomainLocation,      // Tessellated coordinates (u, v)
83    const OutputPatch<HS_OUT, 4> patch, // Control points from the hull shader
84    const HSC_OUT patchConstants        // Patch constants calculated by the hull shader
85)
86{
87    DS_OUT o;
88
89    // Interpolate the position of the tessellated point within the patch
90    float3 p0 = patch[0].position;
91    float3 p1 = patch[1].position;
92    float3 p2 = patch[2].position;
93    float3 p3 = patch[3].position;
94
95    // Bilinear interpolation of the position in the quad
96    float3 interpolatedPosition =
97          p0 * (1 - uv.x) * (1 - uv.y)
98        + p1 * uv.x * (1 - uv.y)
99        + p3 * uv.x * uv.y
100        + p2 * (1 - uv.x) * uv.y;
101
102    // Output final position in clip space
103    o.position = float4(interpolatedPosition, 1.0);
104    return o;
105}