openGL之API学习（二零六）glClientActiveTexture

hankern

已于 2022-02-24 06:45:32 修改

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分类专栏： openGL之API学习文章标签： opengl

于 2022-02-16 06:11:01 首次发布

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glClientActiveTexture是OpenGL中用于选择顶点数组客户端状态参数的函数，它影响glTexCoordPointer和glEnableClientState/glDisableClientState。该函数指定活动的纹理单元，最少支持2个单元，其值可以是GL_TEXTUREi，i从0到GL_MAX_TEXTURE_COORDS - 1。初始值为GL_TEXTURE0。与GLSL中的内置纹理坐标变量gl_MultiTexCoord0到gl_MultiTexCoordN配合使用。

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最多支持到gl3，gl4以后无此函数。启用那一个需要使用glClientActiveTexture，glClientActiveTexture的序号值对应gl_MultiTexCoord后面的数字。

glClientActiveTexture selects the vertex array client state parameters to be modified by glTexCoordPointer, and enabled or disabled with glEnableClientState or glDisableClientState, respectively, when called with a parameter of GL_TEXTURE_COORD_ARRAY.

void glClientActiveTexture(GLenum texture)
texture
Specifies which texture unit to make active. The number of texture units is implementation dependent, but must be at least two. texture must be one of GL_TEXTUREi, where i ranges from 0 to the value of GL_MAX_TEXTURE_COORDS - 1, which is an implementation-dependent value. The initial value is GL_TEXTURE0.

参看openGL之AP