T
glTexSubImage1D
Chapter 18
455
glTexSubImage1D
glTexSubImage1D: specify a two-dimensional texture sub-image.
C Specification
void glTexSubImage1D(
GLenum target,
GLint level,
GLint xoffset,
GLsizei width,
GLenum format,
GLenum type,
const GLvoid *pixels)
Parameters
target Specifies the target texture. Must be GL_TEXTURE_1D.
level Specifies the level-of-detail number. Level 0 is the base image level.
Level n is the nth mipmap reduction image.
xoffset Specifies a texel offset in the x direction within the texture array.
width Specifies the width of the texture sub-image.
format Specifies the format of the pixel data. The following symbolic values
are accepted: GL_COLOR_INDEX, GL_RED, GL_GREEN, GL_BLUE,
GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and
GL_LUMINANCE_ALPHA. If the extension GL_EXT_shadow is
supported, then the symbolic value GL_DEPTH_COMPONENT is also
accepted.
type Specifies the data type of the pixel data. The following symbolic values
are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP,
GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT,
GL_INT, and GL_FLOAT.
pixels Specifies a pointer to the image data in memory.
Description
Texturing maps a portion of a specified texture image onto each graphical primitive for
which texturing is enabled. To enable or disable one-dimensional texturing, call glEnable
and glDisable with argument GL_TEXTURE_1D.
glTexSubImage1D redefines a contiguous subregion of an existing one-dimensional
texture image. The texels referenced by pixels replace the portion of the existing texture
array with X indices xoffset and xoffset + width - 1, inclusive. This region may not include
any texels outside the range of the texture array as it was originally specified. It is not
an error to specify a subtexture with width of 0, but such a specification has no effect.
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