shadertoy-dx11 is inspired by
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shadertoy-dx11 is inspired by

ShaderToy is such an amazing website, I enjoy learning from the fabulous shaders.
In daily work, I care more about Hlsl, which is the shader language for Microsoft Direct3D API. So it would be nice for me to have a standalone Hlsl version of ShaderToy. Certainly it won't run in a browser since there is no WebD3D :)


The usage is quite straightforward:

./bin/shadertoy-dx11.exe ./samples/HelloWorld.toy

Take HelloWorld.hlsl as an example, which does nothing except showing textures[0] aka "photo_4.jpg" on screen.

// demonstrate the use of local image
// photo_4.jpg
// ducky.png
float4 main(float4 pos : SV_POSITION) : SV_Target
    float4 clr0 = textures[0].Sample( smooth, pos.xy / resolution );
    float4 clr1 = textures[1].Sample( blocky, pos.xy / resolution );

    return lerp(clr0, clr1, mouse.x / resolution.x);


If you have previous experience with Hlsl coding, then you must be wondering WTF is smooth and blocky. And how can be photo_4.jpg and ducky.png reference by textures[0] and textures[1]?

Take it easy, the secret behind is that following lines are automatilly added to the shader you write:

Texture2D backbuffer : register( t0 );
Texture2D textures[#n] : register( t1 ); // the exact number of #n is automatically calculated by the shadertoy-dx11

SamplerState smooth : register( s0 );
SamplerState blocky : register( s1 );
SamplerState mirror : register( s2 );

cbuffer CBOneFrame : register( b0 )
    float2     resolution;     // viewport resolution (in pixels)
    float      time;           // shader playback time (in seconds)
    float      aspect;         // cached aspect of viewport
    float4     mouse;          // mouse pixel coords. xy: current (if MLB down), zw: click (TODO:)
    float4     date;           // (year, month, day, time in seconds) (TODO:)


shadertoy-dx11 turns various input source into texture:

  • relative image path, as // photo_4.jpg.
  • absolute image path, as // C:/photo_4.jpg.
  • image on Internet, as //, also refer to samplers/HelloWorldUrl.toy.
  • physical camera devices, as // camera, also refer to samplers/HelloWorldCamera.toy.