glCompressedTexSubImage2D — specify a two-dimensional texture subimage in a compressed format
void glCompressedTexSubImage2D(
|
GLenum target, |
| GLint level, | |
| GLint xoffset, | |
| GLint yoffset, | |
| GLsizei width, | |
| GLsizei height, | |
| GLenum format, | |
| GLsizei imageSize, | |
const void * data); |
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 compressed image data stored at address data.
imageSize
Specifies the number of unsigned bytes of image data starting at the
address specified by data.
data
Specifies a pointer to the compressed image data in memory.
Texturing allows elements of an image array to be read by shaders.
glCompressedTexSubImage2D 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
yoffset and
format must be a known compressed image format from Table 1 below
or an extension-specified compressed-texture format.
If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target
(see glBindBuffer) while a texture image is
specified, data is treated as a byte offset into the buffer object's data store.
| Compressed Internal Format | Base Internal Format | Image Size |
|---|---|---|
GL_COMPRESSED_R11_EAC
|
GL_RED
|
ceil(width/4) * ceil(height/4) * 8 |
GL_COMPRESSED_SIGNED_R11_EAC
|
GL_RED
|
ceil(width/4) * ceil(height/4) * 8 |
GL_COMPRESSED_RG11_EAC
|
GL_RG
|
ceil(width/4) * ceil(height/4) * 16 |
GL_COMPRESSED_SIGNED_RG11_EAC
|
GL_RG
|
ceil(width/4) * ceil(height/4) * 16 |
GL_COMPRESSED_RGB8_ETC2
|
GL_RGB
|
ceil(width/4) * ceil(height/4) * 8 |
GL_COMPRESSED_SRGB8_ETC2
|
GL_RGB
|
ceil(width/4) * ceil(height/4) * 8 |
GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
|
GL_RGBA
|
ceil(width/4) * ceil(height/4) * 8 |
GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
|
GL_RGBA
|
ceil(width/4) * ceil(height/4) * 8 |
GL_COMPRESSED_RGBA8_ETC2_EAC
|
GL_RGBA
|
ceil(width/4) * ceil(height/4) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
|
GL_RGBA
|
ceil(width/4) * ceil(height/4) * 16 |
GL_COMPRESSED_RGBA_ASTC_4x4
|
GL_RGBA
|
ceil(width/4) * ceil(height/4) * 16 |
GL_COMPRESSED_RGBA_ASTC_5x4
|
GL_RGBA
|
ceil(width/5) * ceil(height/4) * 16 |
GL_COMPRESSED_RGBA_ASTC_5x5
|
GL_RGBA
|
ceil(width/5) * ceil(height/5) * 16 |
GL_COMPRESSED_RGBA_ASTC_6x5
|
GL_RGBA
|
ceil(width/6) * ceil(height/5) * 16 |
GL_COMPRESSED_RGBA_ASTC_6x6
|
GL_RGBA
|
ceil(width/6) * ceil(height/6) * 16 |
GL_COMPRESSED_RGBA_ASTC_8x5
|
GL_RGBA
|
ceil(width/8) * ceil(height/5) * 16 |
GL_COMPRESSED_RGBA_ASTC_8x6
|
GL_RGBA
|
ceil(width/8) * ceil(height/6) * 16 |
GL_COMPRESSED_RGBA_ASTC_8x8
|
GL_RGBA
|
ceil(width/8) * ceil(height/8) * 16 |
GL_COMPRESSED_RGBA_ASTC_10x5
|
GL_RGBA
|
ceil(width/10) * ceil(height/5) * 16 |
GL_COMPRESSED_RGBA_ASTC_10x6
|
GL_RGBA
|
ceil(width/10) * ceil(height/6) * 16 |
GL_COMPRESSED_RGBA_ASTC_10x8
|
GL_RGBA
|
ceil(width/10) * ceil(height/8) * 16 |
GL_COMPRESSED_RGBA_ASTC_10x10
|
GL_RGBA
|
ceil(width/10) * ceil(height/10) * 16 |
GL_COMPRESSED_RGBA_ASTC_12x10
|
GL_RGBA
|
ceil(width/12) * ceil(height/10) * 16 |
GL_COMPRESSED_RGBA_ASTC_12x12
|
GL_RGBA
|
ceil(width/12) * ceil(height/12) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4
|
GL_RGBA
|
ceil(width/4) * ceil(height/4) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4
|
GL_RGBA
|
ceil(width/5) * ceil(height/4) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5
|
GL_RGBA
|
ceil(width/5) * ceil(height/5) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5
|
GL_RGBA
|
ceil(width/6) * ceil(height/5) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6
|
GL_RGBA
|
ceil(width/6) * ceil(height/6) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5
|
GL_RGBA
|
ceil(width/8) * ceil(height/5) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6
|
GL_RGBA
|
ceil(width/8) * ceil(height/6) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8
|
GL_RGBA
|
ceil(width/8) * ceil(height/8) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5
|
GL_RGBA
|
ceil(width/10) * ceil(height/5) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6
|
GL_RGBA
|
ceil(width/10) * ceil(height/6) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8
|
GL_RGBA
|
ceil(width/10) * ceil(height/8) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10
|
GL_RGBA
|
ceil(width/10) * ceil(height/10) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10
|
GL_RGBA
|
ceil(width/12) * ceil(height/10) * 16 |
GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12
|
GL_RGBA
|
ceil(width/12) * ceil(height/12) * 16 |
GL_INVALID_ENUM is generated if format is not one of the specific
compressed internal formats listed in Table 1 above.
GL_INVALID_VALUE is generated if imageSize is not consistent with
the format, dimensions, and contents of the specified compressed image
data.
GL_INVALID_OPERATION is generated if parameter combinations are not
supported by the specific compressed internal format as specified in the
specific texture compression extension.
For ETC2/EAC images GL_INVALID_OPERATION is generated if width
is not a multiple of four, and width + xoffset is not equal
to the width of the texture level; if height is not a multiple of four,
and height + yoffset is not equal to the height of the texture level;
or if xoffset or yoffset is not a multiple of four.
For ASTC images GL_INVALID_OPERATION is generated if width
is not a multiple of the block width, and width + xoffset is not equal
to the width of the texture level; if height is not a multiple of the block height,
and height + yoffset is not equal to the height of the texture level;
or if xoffset or yoffset is not a multiple of the corresponding block dimension.
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.
Undefined results, including abnormal program termination, are generated if
data is not encoded in a manner consistent with the extension
specification defining the internal compression format.
glGet with argument GL_PIXEL_UNPACK_BUFFER_BINDING
| OpenGL ES API Version | ||||
|---|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 | 3.2 |
| glCompressedTexSubImage2D | ✔ | ✔ | ✔ | ✔ |
glActiveTexture, glCompressedTexImage2D, glCompressedTexImage3D, glCompressedTexSubImage3D, glCopyTexImage2D, glCopyTexSubImage2D, glCopyTexSubImage3D, glPixelStorei, glTexImage2D, glTexImage3D, glTexSubImage2D, glTexSubImage3D, glTexParameter
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