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 48. texture must be one of GL_TEXTUREi, where i ranges from 0 (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 48.
GL_INVALID_ENUM is generated if texture is not one of GL_TEXTUREi, where i ranges from 0 to (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1).
open.gl - Textures Objects and Parameters
opengl-tutorial.org - Tutorial 13 : Normal Mapping
glGenTextures, glBindTexture, glCompressedTexImage1D, glCompressedTexImage2D, glCompressedTexImage3D, glCompressedTexSubImage1D, glCompressedTexSubImage2D, glCompressedTexSubImage3D, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glDeleteTextures glIsTexture, glTexImage1D, glTexImage2D, glTexImage2DMultisample, glTexImage3D, glTexImage3DMultisample, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D, glTexParameter,
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