28 lines
628 B
Plaintext
28 lines
628 B
Plaintext
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// emulated noperspective
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#ifndef LOG_DEPTH
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varying float v_WindowZ;
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#endif
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/**
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* Clamps a vertex to the far plane.
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*
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* @name czm_depthClampFarPlane
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* @glslFunction
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*
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* @param {vec4} coords The vertex in clip coordinates.
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* @returns {vec4} The vertex clipped to the far plane.
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*
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* @example
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* gl_Position = czm_depthClampFarPlane(czm_modelViewProjection * vec4(position, 1.0));
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*
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* @see czm_writeDepthClampedToFarPlane
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*/
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vec4 czm_depthClampFarPlane(vec4 coords)
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{
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#ifndef LOG_DEPTH
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v_WindowZ = (0.5 * (coords.z / coords.w) + 0.5) * coords.w;
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coords.z = min(coords.z, coords.w);
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#endif
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return coords;
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}
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