glActiveTexture - select active texture unit

glGet() with argument GL_ACTIVE_TEXTURE, or GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS.

voidglActiveTexture(GLenumtexture);

       Copyright © 1991-2006 Silicon Graphics, Inc.
       Copyright © 2010-2014 Khronos Group

[FIXME: source]                                    11/18/2024                                GLACTIVETEXTURE(3G)

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 80.

GL_INVALID_ENUM is generated if texture is not one of GL_TEXTUREi, where i ranges from zero to the value
       of GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS minus one.

       glActiveTexture - select active texture unit

texture
           Specifies which texture unit to make active. The number of texture units is implementation dependent,
           but must be at least 80.  texture must be one of GL_TEXTUREi, where i ranges from zero to the value
           of GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS minus one. The initial value is GL_TEXTURE0.

glGenTextures(), glBindTexture(), glCompressedTexImage1D(), glCompressedTexImage2D(),
       glCompressedTexImage3D(), glCompressedTexSubImage1D(), glCompressedTexSubImage2D(),
       glCompressedTexSubImage3D(), glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(),
       glCopyTexSubImage2D(), glCopyTexSubImage3D(), glDeleteTextures() glIsTexture(), glTexImage1D(),
       glTexImage2D(), glTexImage2DMultisample(), glTexImage3D(), glTexImage3DMultisample(), glTexSubImage1D(),
       glTexSubImage2D(), glTexSubImage3D(), glTexParameter(),

       ┌─────────────────┬───────────────────────────────────────────────────────────────────────┐
       │                 │                OpenGLVersion                                         │
       ├─────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │ Function        │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │ /               │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Feature         │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Name            │     │     │     │     │     │     │     │     │     │     │     │     │
       ├─────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glActiveTexture │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       └─────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘