| 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 |
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| None. |
| |
| Revision History |
| |
| 8/1/2011 Documented the extension |
| 7/4/2013 Add a new parameter dest_type to glCopyTextureCHROMIUM() |