glTexSubImage3DEXT Subroutine

OpenGL 1.1 for AIX: Reference Manual

glTexSubImage3DEXT Subroutine

Purpose

Specifies a three-dimensional (3D) texture subimage.

Library

OpenGL C bindings library: libGL.a

C Syntax

void glTexSubImage3DEXT(GLenum target,
                      GLint level,
                      GLint xoffset,
                      GLint yoffset,
                      GLint zoffset,
                      GLsizei width,
                      GLsizei height,
                      GLsizei depth,
                      GLenum format,
                      GLenum type,
                      const GLvoid *pixels)

Parameters

target	Specifies the target texture. Must be GL_TEXTURE_3D_EXT.
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.
yoffset	Specifies a texel offset in the y direction within the texture array.
zoffset	Specifies a texel offset in the z direction within the texture array.
width	Specifies the width of the texture subimage.
height	Specifies the height of the texture subimage.
depth	Specifies the depth of the texture subimage.
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.
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 and disable three-dimensional texturing, call glEnable and glDisable with argument GL_TEXTURE_3D_EXT.

The glTexSubImage3DEXT subroutine redefines a contiguous subregion of an existing three-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, y indices yoffset and yoffset + height - 1, inclusive, z indices zoffset and zoffset + depth - 1, inclusize. 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 zero width, height or depth, but such a specification has no effect.

Notes

Texturing has no effect in color index mode.

The glPixelStore and glPixelTransfer modes affect texture images in exactly the way they affect glDrawPixels.

Format of GL_ABGR_EXT is part of the _extname (EXT_abgr) extension, not part of the core GL command set.

Errors

GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D_EXT.

GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage3D operation.

GL_INVALID_VALUE is generated if level is less than zero.

GL_INVALID_VALUE may be generated if level is greater than log2(max), where max is the returned value of GL_MAX_3D_TEXTURE_SIZE_EXT.

GL_INVALID_VALUE is generated if width < -b or if height < -b, or if depth < -b where b is the border width of the texture array.

GL_INVALID_VALUE is generated if xoffset < -b, (xoffset + width) > (w - b), yoffset < -b, (yoffset + height) > (h - b), zoffset < -b, (zoffset + depth) > (d -b). Where w is the GL_TEXTURE_WIDTH, h is the GL_TEXTURE_HEIGHT, d is the GL_TEXTURE_DEPTH_EXT, and b is the border width of the texture image being modified. Note that w, h, and d include twice the border width.

GL_INVALID_ENUM is generated if format is not an accepted format constant.

GL_INVALID_ENUM is generated if type is not a type constant.

GL_INVALID_ENUM is generated if type is GL_BITMAP and format is not GL_COLOR_INDEX.

GL_INVALID_OPERATION is generated if glTexSubImage3DEXT is executed between the execution of glBegin and the corresponding execution of glEnd.

Associated Gets

glGetTexImage

glIsEnabled with argument GL_TEXTURE_3D_EXT

Related Information

The glDrawPixels subroutine, glFog subroutine, glPixelStore subroutine, glPixelTransfer subroutine, glTexEnv subroutine, glTexGen subroutine, glTexImage3DEXT subroutine, glTexParameter subroutine.