Texture Autogen Mipmap Extension; Window Extensions For Hp's Implementation Of Opengl - HP Workstation zx2000 Implementation Manual

overview of OpenGL

texture autogen MIPmap extension

The autogen MIPmap extension introduces a side effect to the modification of the base level
texture map. When enabled, any change to the base-level texture map will cause the computation
of a complete MIPmap stack form for that base level. The internal formats and border widths of
the derived MIPmap will match those of the base map, and the dimensions of the derived
MIPmap follow the requirements set forth in OpenGL for a valid MIPmap. A simple 2 x 2 box
filter is used to generate the MIPmap levels.
Extended Area
Texture Parameter
To use the autogen MIPmap extension, set GL_GENERATE_MIPMAP_EXT to GL_TRUE in
glTexParameter. For example, here is a code fragment that uses this extension:
glTexParameter[if](GL_TEXTURE_2D,GL_GENERATE_MIPMAP_EXT,
GL_TRUE);
For related information on this extension, see the function: glTexParameter.
X Window extensions for hp's implementation of OpenGL
HP's implementation of OpenGL includes two GLX extensions that deal with extended GLX
visual information that is not included in the OpenGL 1.1 Standard. These extensions are both
supported by HP's implementation of the OpenGL API library, but, prior to using them,
glXQueryExtensionsString should be called to verify that the extensions are supported
on the target display.
GLX visual information extension
The GLX_EXT_visual_info extension provides additional GLX visual information and
enhanced control of GLX Visual selection. The enumerated types listed below can be passed to
either glXChooseVisual or glXGetConfig to specify or inquire the visual type or
transparency capabilities.
1–16
Enumerated Types for Autogen MIPmap
Enumerated Type
GL_GENERATE_MIPMAP_EXT
Default: GL_FALSE
Description
Enables autogen MIPmap
OpenGL implementation guide