glActiveTexture — select active texture unit
void glActiveTexture( | 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_TEXTURE, where i ranges from 0 to the larger of (GL_MAX_TEXTURE_COORDS - 1) and (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1). The initial value is GL_TEXTURE0.
glActiveTexture selects which texture unit subsequent texture state calls will affect. The number of texture units an implementation supports is implementation dependent, but must be at least 2.
Vertex arrays are client-side GL resources, which are selected by the glClientActiveTexture routine.
glActiveTexture is only supported if the GL version is 1.3 or greater, or if ARB_multitexture is included in the string returned by glGetString when called with the argument GL_EXTENSIONS.
GL_INVALID_ENUM is generated if texture is not one of GL_TEXTURE, where i ranges from 0 to the larger of (GL_MAX_TEXTURE_COORDS - 1) and (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1).
glGet with argument GL_ACTIVE_TEXTURE, GL_MAX_TEXTURE_COORDS, or GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
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