HP b2600 Reference Guide

G
glGetTexImage
Chapter 7
217
glGetTexImage
glGetTexImage: return a texture image.
C Specification
void glGetTexImage(
GLenum target,
GLint level,
GLenum format,
GLenum type,
GLvoid *pixels)
Parameters
target Specifies which texture is to be obtained. GL_TEXTURE_1D and
GL_TEXTURE_2D are accepted.
level Specifies the level-of-detail number of the desired image. Level 0 is the
base image level. Level n is the nth mipmap reduction image.
format Specifies a pixel format for the returned data.
The supported formats are GL_RED, GL_GREEN, GL_BLUE,
GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and
GL_LUMINANCE_ALPHA.
type Specifies a pixel type for the returned data. The supported types are
GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT,
GL_SHORT, GL_UNSIGNED_INT, GL_INT, and GL_FLOAT.
pixels Returns the texture image. Should be a pointer to an array of the type
specified by type.
Description
glGetTexImage returns a texture image into pixels. target specifies whether the desired
texture image is one specified by glTexImage1D (GL_TEXTURE_1D) or by
glTexImage2D (GL_TEXTURE_2D). level specifies the level-of-detail number of the
desired image. format and type specify the format and type of the desired image array.
See the reference pages glTexImage1D and glDrawPixels for a description of the
acceptable values for the format and type parameters, respectively.
To understand the operation of glGetTexImage, consider the selected internal
four-component texture image to be an RGBA color buffer the size of the image. The
semantics of glGetTexImage are then identical to those of glReadPixels called with the
same format and type, with x and y set to 0, width set to the width of the texture image
(including border if one was specified), and height set to 1 for 1D images, or to the height
of the texture image (including border if one was specified) for 2D images.
Because the internal texture image is an RGBA image, pixel formats
GL_COLOR_INDEX, GL_STENCIL_INDEX, and GL_DEPTH_COMPONENT are not
accepted, and pixel type GL_BITMAP is not accepted.

HP b2600 Specifications

General

Brand	HP
Model	b2600
Category	Desktop
Language	English