Gl.TexSubImage1D (gb.opengl)

Static Sub TexSubImage1D ( Image As Image, XOffset As Integer, Width As Integer [ , Level As Integer ] )

自从 3.6

Specify a one-dimensional texture subimage.

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 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 or disable one-dimensional texturing, call Gl.Enable and Gl.Disable with argument Gl.TEXTURE_1D.

Gl.TexSubImage1D redefines a contiguous subregion of an existing one-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. 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.

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.TexSubImage1D specifies a one-dimensional subtexture for the current texture unit, specified with Gl.ActiveTexture.

Errors

Gl.INVALID_ENUM is generated if target is not one of the allowable values.

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

, or if

(xoffset + width) > (w - b)

, where

w

is the Gl.TEXTURE_WIDTH, and

b

is the width of the Gl.TEXTURE_BORDER of the texture image being modified. Note that

w

includes twice the border width.

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

Gl.INVALID_OPERATION is generated if the texture array has not been defined by a previous Gl.TexImage1D 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