The fragment shader must not declare any varyings with the same name but different type, or statically used varyings without being declared in the vertex shader. An example of this is

I'm struggling with shaders because I want the fog to be reflected in the water using Three.js sky_sun_shader. I added the following code snippet to the fragment Shader:

THREE.ShaderChunk[ "fog_pars_fragment" ],

THREE.ShaderChunk ["fog_fragment" ],

This setup worked perfectly fine with r71 but encountered an error when used with r101:

THREE.WebGLProgram: shader error: 0 35715 false gl.getProgramInfoLog Variations with the same name but different type, or statically used variations in fragment shader are not declared in vertex shader: fogDepth

How do I go about fixing this issue?

Sample code from the shader:

THREE.ShaderLib['water'] = {
uniforms: THREE.UniformsUtils.merge( [
    THREE.UniformsLib[ "fog" ], {   
            "normalSampler":    { type: "t", value: null },
            "mirrorSampler":    { type: "t", value: null },
            "alpha":            { type: "f", value: 1.0 },
            "time":             { type: "f", value: 0.0 },
            ...
   }
] ),
vertexShader: [...],
fragmentShader: [...]

};

https://i.sstatic.net/PnfvN.jpg

Answer №1

It's crucial to ensure uniformity in the declaration between vertex and fragment shaders when incorporating code from ShaderChunks.

For example, you have integrated code from two fragment shaders: fog_pars_fragment and fog_fragment.

Therefore, it is essential to also include the corresponding chunks from the vertex shaders, fog_pars_vertex and fog_vertex (in your vertex shader). fog_pars_vertex defines the missing varying variable.

// fog_pars_vertex.glsl

#ifdef USE_FOG

    varying float fogDepth;

#endif

// fog_vertex.glsl

#ifdef USE_FOG

    fogDepth = -mvPosition.z;

#endif

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