Gl.TexSubImage2D (gb.opengl)

Static Sub TexSubImage2D ( Image As Image, XOffset As Integer, YOffset As Integer, Width As Integer, Height As Integer [ , Level As Integer ] )

Since 3.6

Specify a two-dimensional texture subimage.

Parameters

target: Specifies the target texture. Must be Gl.TEXTURE_2D, Gl.TEXTURE_CUBE_MAP_POSITIVE_X, Gl.TEXTURE_CUBE_MAP_NEGATIVE_X, Gl.TEXTURE_CUBE_MAP_POSITIVE_Y, Gl.TEXTURE_CUBE_MAP_NEGATIVE_Y, Gl.TEXTURE_CUBE_MAP_POSITIVE_Z, or Gl.TEXTURE_CUBE_MAP_NEGATIVE_Z.
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.
width: Specifies the width of the texture subimage.
height: Specifies the height of the texture subimage.
format: Specifies the format of the pixel data. The following symbolic values are accepted: Gl.RED, Gl.RG, Gl.RGB, Gl.BGR, Gl.RGBA, and Gl.BGRA.
type: Specifies the data type of the pixel data. The following symbolic values are accepted: Gl.UNSIGNED_BYTE, Gl.BYTE, Gl.UNSIGNED_SHORT, Gl.SHORT, Gl.UNSIGNED_INT, Gl.INT, Gl.FLOAT, Gl.UNSIGNED_BYTE_3_3_2, Gl.UNSIGNED_BYTE_2_3_3_REV, Gl.UNSIGNED_SHORT_5_6_5, Gl.UNSIGNED_SHORT_5_6_5_REV, Gl.UNSIGNED_SHORT_4_4_4_4, Gl.UNSIGNED_SHORT_4_4_4_4_REV, Gl.UNSIGNED_SHORT_5_5_5_1, Gl.UNSIGNED_SHORT_1_5_5_5_REV, Gl.UNSIGNED_INT_8_8_8_8, Gl.UNSIGNED_INT_8_8_8_8_REV, Gl.UNSIGNED_INT_10_10_10_2, and Gl.UNSIGNED_INT_2_10_10_10_REV.
data: 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 two-dimensional texturing, call Gl.Enable and Gl.Disable with argument Gl.TEXTURE_2D.

Gl.TexSubImage2D redefines a contiguous subregion of an existing two-dimensional texture image. The texels referenced by data replace the portion of the existing texture array with x indices xoffset and

xoffset + width - 1

, inclusive, and y indices yoffset and

yoffset + height - 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 or height, but such a specification has no effect.

If a non-zero named buffer object is bound to the Gl.PIXEL_UNPACK_BUFFER target (see Gl.BindBuffer) while a texture image is specified, data is treated as a byte offset into the buffer object's data store.

Notes

Gl.PixelStore modes affect texture images.

Gl.TexSubImage2D specifies a two-dimensional subtexture for the current texture unit, specified with Gl.ActiveTexture.

Errors

Gl.INVALID_ENUM is generated if target is not Gl.TEXTURE_2D, Gl.TEXTURE_CUBE_MAP_POSITIVE_X, Gl.TEXTURE_CUBE_MAP_NEGATIVE_X, Gl.TEXTURE_CUBE_MAP_POSITIVE_Y, Gl.TEXTURE_CUBE_MAP_NEGATIVE_Y, Gl.TEXTURE_CUBE_MAP_POSITIVE_Z, or Gl.TEXTURE_CUBE_MAP_NEGATIVE_Z.

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_VALUE is generated if level is less than 0.

Gl.INVALID_VALUE may be generated if level is greater than

\log_{2}

max, where max is the returned value of Gl.MAX_TEXTURE_SIZE.

Gl.INVALID_VALUE is generated if

xoffset < - b

(xoffset + width) > (w - b)

yoffset < - b

, or

(yoffset + height) > (h - b)

, where

w

is the Gl.TEXTURE_WIDTH,

h

is the Gl.TEXTURE_HEIGHT, and

b

is the border width of the texture image being modified. Note that

w

and

h

include twice the border width.

Gl.INVALID_VALUE is generated if width or height is less than 0.

Gl.INVALID_OPERATION is generated if the texture array has not been defined by a previous Gl.TexImage2D operation.

Gl.INVALID_OPERATION is generated if type is one of Gl.UNSIGNED_BYTE_3_3_2, Gl.UNSIGNED_BYTE_2_3_3_REV, Gl.UNSIGNED_SHORT_5_6_5, or Gl.UNSIGNED_SHORT_5_6_5_REV and format is not Gl.RGB.

Gl.INVALID_OPERATION is generated if type is one of Gl.UNSIGNED_SHORT_4_4_4_4, Gl.UNSIGNED_SHORT_4_4_4_4_REV, Gl.UNSIGNED_SHORT_5_5_5_1, Gl.UNSIGNED_SHORT_1_5_5_5_REV, Gl.UNSIGNED_INT_8_8_8_8, Gl.UNSIGNED_INT_8_8_8_8_REV, Gl.UNSIGNED_INT_10_10_10_2, or Gl.UNSIGNED_INT_2_10_10_10_REV and format is neither Gl.RGBA nor Gl.BGRA.

Gl.INVALID_OPERATION is generated if a non-zero buffer object name is bound to the Gl.PIXEL_UNPACK_BUFFER target and the buffer object's data store is currently mapped.

Gl.INVALID_OPERATION is generated if a non-zero buffer object name is bound to the Gl.PIXEL_UNPACK_BUFFER target and the data would be unpacked from the buffer object such that the memory reads required would exceed the data store size.

Gl.INVALID_OPERATION is generated if a non-zero buffer object name is bound to the Gl.PIXEL_UNPACK_BUFFER target and data is not evenly divisible into the number of bytes needed to store in memory a datum indicated by type.

Associated Gets

Gl.GetTexImage

Gl.Get with argument Gl.PIXEL_UNPACK_BUFFER_BINDING