glTexSubImage3DEXT

glTexSubImage3DEXT: specify a three-dimensional texture subimage.

C Specification

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. If the extension GL_EXT_shadow is supported, 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.

Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled. Three-dimensional texturing is enabled and disabled using glEnable and glDisable with argument GL_TEXTURE_3D_EXT.

glTexSubImage3DEXT 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, and Z indices zoffset and zoffset + depth 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 zero width, height or depth, but such a specification has no effect.

Notes

Texturing has no effect in color index mode.

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

Errors

GL_INVALID_ENUM is generated when target is not GL_TEXTURE_3D_EXT.
GL_INVALID_OPERATION is generated when the texture array has not been defined by a previous glTexImage3D operation.
GL_INVALID_VALUE is generated if level is less than zero or greater than log₂max, where max is the returned value of GL_MAX_3D_TEXTURE_SIZE_EXT.
GL_INVALID_VALUE is generated if xoffset <TEXTURE_BORDER, (xoffset + width) > (TEXTURE_WIDTH TEXTURE_BORDER), yoffset < TEXTURE_BORDER, zoffset < TEXTURE_BORDER, or (zoffset + depth) > (TEXTURE_DEPTH_EXT TEXTURE_BORDER), where TEXTURE_WIDTH, TEXTURE_HEIGHT, TEXTURE_DEPTH_EXT and TEXTURE_BORDER are the state values of the texture image being modified. Note that TEXTURE_WIDTH, TEXTURE_HEIGHT and TEXTURE_DEPTH_EXT include twice the border width.
GL_INVALID_ENUM is generated when format is not an accepted format constant.
GL_INVALID_ENUM is generated when 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