yum-mirror/slang

Making it easier to work with shaders

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

Theresa FoleyAdd an example for reflection of parameter blocks (#6161)31bb5eaa0

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1// shader.slang
2
3// This module is part of the `reflection-parameter-blocks`
4// example program.
5//
6// This module is split out from the files that define
7// individual programs, so that we can share some type
8// definitions and utility functions between all of
9// the programs and keep them focused on just defining
10// the shader entry points.
11
12struct Mesh
13{
14    float4x4 modelToWorld;
15    float4x4 modelToWorld_inverseTranspose;
16}
17
18struct Material
19{
20    Texture2D albedoMap;
21    Texture2D glossMap;
22    Texture2D normalMap;
23    SamplerState sampler;
24}
25
26interface ILight
27{
28}
29
30struct DirectionalLight : ILight
31{
32    float3 dir;
33    float3 intensity;
34}
35
36struct ShadowedLight<L : ILight> : ILight
37{
38    L light;
39    Texture2D shadowMap;
40    SamplerComparisonState shadowSampler;
41    float4x4 worldToShadow;
42}
43
44struct EnvironmentMap
45{
46    TextureCube texture;
47    SamplerState sampler;
48}
49
50struct Environment
51{
52    ShadowedLight<DirectionalLight> sunLight;
53    EnvironmentMap envMap;
54    RWStructuredBuffer<float4> output;
55}
56
57struct View
58{
59    float4x4 worldToView;
60    float4x4 viewToProj;
61}
62
63// While the Slang compilation library will *reflect* all of
64// the shader parameters that a program declares,
65// back-ends (such as the SPIR-V code generator) will often
66// strip out parameters that are not used as part of the
67// computation that a shader performs.
68//
69// When shader parameters are stripped from the output
70// binary code, the runtime system for a particular API
71// (e.g., the Vulkan validation layer) cannot check
72// whether a program is correctly handling the binding
73// of those parameters.
74//
75// Our example entry points will thus make use of some
76// utility routines that serve the purpose of allowing
77// us to ensure that specific parameters are seen as
78// "used" during code generation.
79
80void use(inout float4 r, float4 v) { r += v; }
81void use(inout float4 r, float3 v) { r.xyz += v; }
82
83void use(inout float4 r, Texture2D t, SamplerState s)
84{
85    use(r, t.SampleLevel(s, r.xy, 0));
86}
87
88void use(inout float4 r, RWStructuredBuffer<float4> b)
89{
90    use(r, b[int(r.x)]);
91    b[int(r.x)] = r;
92}
93
94void use(inout float4 r, Environment e)
95{
96    use(r, e.sunLight.light.dir);
97    use(r, e.output);
98}
99
100void use(inout float4 r, View v)
101{
102    use(r, v.worldToView[0]);
103}
104
105void use(inout float4 r, Material m)
106{
107    use(r, m.normalMap, m.sampler);
108}
109
110void use(inout float4 r, Mesh m)
111{
112    use(r, m.modelToWorld[0]);
113}