HP b2600 Reference Manual page 452

T
glTexParameter
Sets the wrap parameter for texture coordinate t to GL_CLAMP, GL_REPEAT,
GL_CLAMP_TO_BORDER_EXT, or GL_CLAMP_TO_EDGE_EXT. See the discussion
under GL_TEXTURE_WRAP_S. Initially, GL_TEXTURE_WRAP_T is set to
GL_REPEAT.
GL_TEXTURE_WRAP_R_EXT
Sets the wrap parameter for texture coordinate r to GL_CLAMP, GL_REPEAT,
GL_CLAMP_TO_BORDER_EXT, or GL_CLAMP_TO_EDGE_EXT. See the discussion
under GL_TEXTURE_WRAP_S. Initially, GL_TEXTURE_WRAP_R_EXT is set to
GL_REPEAT.
GL_TEXTURE_BORDER_COLOR
Sets a border color. params contains four values that comprise the RGBA color of the
texture border. Integer color components are interpreted linearly such that the most
positive integer maps to 1.0, and the most negative integer maps to - 1.0. The values are
clamped to the range [0, 1] when they are specified. Initially, the border color is (0, 0, 0,
0).
GL_TEXTURE_PRIORITY
Specifies the texture residence priority of the currently bound texture. Permissible
values are in the range [0, 1]. See glPrioritizeTextures and glBindTexture for more
information.
GL_GENERATE_MIPMAP_EXT
Specifies whether MIP levels should be automatically filtered when the base level (level
0) of a texture map is modified with glTexImage1D, glTexImage2D, glTexImage3DEXT,
glTexSubImage1D. glTexSubImage2D, glTexSubImage3DEXT, glCopyTexImage1D,
glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, or
glCopyTexSubImage3DEXT. The default is GL_FALSE (no automatic generation of MIP
levels).
GL_TEXTURE_COMPARE_EXT
Specifies whether the depth texture comparison operator is in effect. param is either
GL_TRUE or GL_FALSE. The default is GL_FALSE, meaning that the depth texture
comparison operator is not in effect (see GL_TEXTURE_COMPARE_OPERATOR_EXT,
below).
GL_TEXTURE_COMPARE_OPERATOR_EXT
Specifies the comparison operator to be used when the depth texture comparison
operator is in effect and the texture format is one of the GL_DEPTH formats. param is
one of GL_TEXTURE_LEQUAL_R_EXT or GL_TEXTURE_GEQUAL_R_EXT. When the
depth texture comparison operator is enabled, the r coordinate is interpolated over the
primitive and compared with the depth value found at the interpolated s and t
coordinate location in the texture map. This comparison is either less-than-or-equal-to
(GL_TEXTURE_LEQUAL_R_EXT) or greater-than-or-equal-to
(GL_TEXTURE_GEQUAL_R_EXT). The result of the comparison is 0.0 if it fails, or 1.0 if
it passes. If texture filtering is enabled, this comparison is performed for all of the texels
involved in the filtering operation, and the resulting values interpolated (note that only
GL_LINEAR and GL_NEAREST minification and magnification filters are supported for
depth texture comparison). This result is passed down as the alpha component of the
texture color to subsequent texture application; the red, green, and blue components are
set to 0.0. The depth comparison operator is typically used to produce shadow effects.
452
Chapter 18