glsl函数之纹理函数

#glsl函数之纹理函数

texture2D

Retrieves texels from a texture

vec4 texture2D(sampler2D sampler, vec2 coord)
vec4 texture2D(sampler2D sampler, vec2 coord, float bias)

Parameters

sampler specifies the sampler to which the texture from which texels will be retrieved is bound.

coord specifies the texture coordinates at which texture will be sampled.

bias specifies an optional bias to be applied during level-of-detail computation.

Description

The texture2D function returns a texel, i.e. the (color) value of the texture for the given coordinates. The function has one input parameter of the type sampler2D and one input parameter of the type vec2 : sampler, the uniform the texture is bound to, and coord, the 2-dimensional coordinates of the texel to look up.

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