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CHROMIUM_compressed_copy_texture.txt
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Name
CHROMIUM_copy_compressed_texture
Name Strings
GL_CHROMIUM_copy_compressed_texture
Version
Last Modifed Date: August 5, 2015
Dependencies
OpenGL ES 2.0 is required.
GL_AMD_compressed_ATC_texture, GL_ATI_texture_compression_atitc,
GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt5,
GL_EXT_texture_compression_s3tc and GL_OES_compressed_ETC1_RGB8_texture
affects the definition of this extension.
Overview
This extension provides functionality for copying compressed textures. It
adds a new function glCompressedCopyTextureCHROMIUM that works similarily
to glCopyTextureCHROMIUM, but for compressed textures.
Which compressed texture formats that this extension supports depends on
the supported texture compression formats of the host GPU.
Issues
glCompressedCopyTextureCHROMIUM will first try to copy into a compressed
texture of the same format as the source texture. If unsucessful, the
destination texture format will be changed to GL_RGBA and the texture will
be stored uncompressed.
New Procedures and Functions
The command
void glCompressedCopyTextureCHROMIUM (GLuint source_id, GLuint dest_id)
Copies the contents of a compressed texture referred to by <source_id> to
<dest_id> texture.
Texture level 0 is copied from the source image to level 0 of the
destination texture.
The internal format of the source texture must be one of the following
symbolic constants: GL_ATC_RGB_AMD, GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD,
GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
GL_ETC1_RGB8_OES
The destination texture will be created or replaced with the same internal
format as the source texture.
INVALID_OPERATION is generated if internal format of source texture is not
one of the valid formats described above.
INVALID_OPERATION is generated if destination texture is immutable.
INVALID_VALUE is generated if <source_id> or <dest_id> are not valid texture
objects.
INVALID_VALUE is generated if textures corresponding to <dest_id> have not
been bound as GL_TEXTURE_2D object.
INVALID_VALUE is generated if level 0 of the source texture is not defined.
Errors
None.
New Tokens
None.
New State
None.
Revision History
15/6/2015 Documented the extension.
5/8/2015 Added glCompressedCopySubTextureCHROMIUM.
1/6/2016 Remove glCompressedCopySubTextureCHROMIUM.
1/8/2016 Remove <target> argument.