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Name
CHROMIUM_copy_texture
Name Strings
GL_CHROMIUM_copy_texture
Version
Last Modifed Date: April 1, 2013
Dependencies
OpenGL ES 2.0 is required.
CHROMIUM_flipy affects the definition of this extension.
EXT_texture_format_BGRA8888 affects the definition of this extension.
Overview
This extension expands on the functionality provided by the
glCopyTexImage2D command. A new function is exported,
glCopyTextureCHROMIUM, that performs the same copy operation as
glCopyTexImage2D, while respecting the pixel-storage modifiers
UNPACK_FLIP_Y_CHROMIUM, GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM and
GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM.
If GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM and
GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM are enabled. Then no alpha
processing occurs. This is the equivalent of having neither flag set.
The extension also supports copying BGRA textures and copying
EXTERNAL_OES texture to BGRA texture, which is not explicitly
granted by EXT_texture_format_BGRA8888.
New Procedures and Functions
void glCopyTextureCHROMIUM (GLenum target, GLenum source_id,
GLenum dest_id, GLint level,
GLint internal_format, GLenum dest_type)
Copies the contents of texture referred to by <source_id> to texture
<dest_id>.
Texture level 0 is copied from the source image to level <level> of the
destination texture. The level parameter must be 0 at present.
The internal format of the destination texture is converted to that
specified by <internal_format>.
The format type of the destination texture is converted to that specified
by <dest_type>.
<target> uses the same parameters as TexImage2D.
INVALID_VALUE is generated if <target> is not GL_TEXTURE_2D.
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 textures corresponding to <source_id> have not
been bound as GL_TEXTURE_2D or GL_TEXTURE_EXTERNAL_OES objects.
INVALID_VALUE is generated if <level> is not a valid level of the
destination texture, or if level 0 of the source texture is not defined.
Errors
None.
New Tokens
None.
New State
None.
Revision History
8/1/2011 Documented the extension
7/4/2013 Add a new parameter dest_type to glCopyTextureCHROMIUM()
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