@thi.ng/shader-ast-stdlib/tex/normal.d.ts

Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast

/**
 * Computes the surface normal from a grayscale texture at given `uv` position
 * and using given `step` to define the half-distances between the 4 neighbor
 * lookups (north/south/east/west). The `z` value is used as the normal's Z
 * component (prior to normalization). `eps` is being added to all components to
 * avoid zero-vectors.
 *
 * @remarks
 * The function only uses the X (red) component of the texture.
 *
 * @param tex
 * @param uv
 * @param step
 * @param z
 * @param eps
 */
export declare const normal2: import("@thi.ng/shader-ast").TaggedFn5<"sampler2D", "vec2", "vec2", "float", "float", "vec3">;
/**
 * Principally the same as {@link normal2}, but using a RGBA 8bit/channel
 * texture storing float values encoded using {@link packFloat}. WHen
 * `packedNormal2()` then samples this textures, each value will be
 * automatically decoded using {@link unpackFloat}.
 *
 * @param tex
 * @param uv
 * @param step
 * @param z
 * @param eps
 */
export declare const packedNormal2: import("@thi.ng/shader-ast").TaggedFn5<"sampler2D", "vec2", "vec2", "float", "float", "vec3">;
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