Slang

https://shader-slang.org/docs

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Slang is a portable shading language and compiler extending HLSL to support advanced language...

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### Compile Slang to target platforms

Source: https://shader-slang.org/docs/first-slang-shader

Command-line instructions for compiling Slang shaders into Vulkan SPIR-V or GLSL formats.

```bash
.\slangc.exe hello-world.slang -profile glsl_450 -target spirv -o hello-world.spv -entry computeMain
```

```bash
.\slangc.exe hello-world.slang -profile glsl_450 -target glsl -o hello-world.glsl -entry computeMain
```

--------------------------------

### Define a basic compute shader

Source: https://shader-slang.org/docs/first-slang-shader

A simple compute shader that adds values from two input buffers and stores the result in an output buffer.

```slang
// hello-world.slang
StructuredBuffer<float> buffer0;
StructuredBuffer<float> buffer1;
RWStructuredBuffer<float> result;

[shader("compute")]
[numthreads(1,1,1)]
void computeMain(uint3 threadId : SV_DispatchThreadID)
{
    uint index = threadId.x;
    result[index] = buffer0[index] + buffer1[index];
}
```

--------------------------------

### Generated GLSL output

Source: https://shader-slang.org/docs/first-slang-shader

The resulting GLSL code after compiling the initial Slang shader, showing how Slang handles binding layouts.

```glsl
// hello-world.glsl (generated by slangc)
#version 450
layout(row_major) uniform;
layout(row_major) buffer;

#line 2 0
layout(std430, binding = 0) readonly buffer _S1 {
    float _data[];
} buffer0_0;

#line 3
layout(std430, binding = 1) readonly buffer _S2 {
    float _data[];
} buffer1_0;

#line 4
layout(std430, binding = 2) buffer _S3 {
    float _data[];
} result_0;

layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void main()
{

#line 10
    uint index_0 = gl_GlobalInvocationID.x;
    float _S4 = ((buffer0_0)._data[(index_0)]);

#line 11
    float _S5 = ((buffer1_0)._data[(index_0)]);

#line 11
    float _S6 = _S4 + _S5;

#line 11
    ((result_0)._data[(index_0)]) = _S6;

#line 8
    return;
}
```

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