glsl函数之纹理函数

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最新推荐文章于 2025-05-28 11:17:11 发布

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分类专栏： glsl 文章标签： unity

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本文详细介绍了OpenGL Shading Language (GLSL)中的纹理函数texture2D和textureCube，包括它们的参数、用途以及如何在计算中应用偏移量。通过这两个函数，开发者可以从纹理中检索颜色值，适用于2D和立方体贴图操作。

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#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.

There is an optional third input parameter of the type float: bias. After calculating the appropriate level of detail for a texture with mipmaps the bias is added before the actual texture lookup operation is executed.

textureCube

Retrieves texels from a texture

vec4 textureCube(samplerCube sampler, vec3 coord)
vec4 textureCube(samplerCube sampler, vec3 coord, float bias)