| Name |
| |
| CHROMIUM_copy_texture |
| |
| Name Strings |
| |
| GL_CHROMIUM_copy_texture |
| |
| Version |
| |
| Last Modifed Date: July 16, 2014 |
| |
| Dependencies |
| |
| OpenGL ES 2.0 is required. |
| |
| EXT_texture_format_BGRA8888 affects the definition of this extension. |
| ARB_texture_rg affects the definition of this extension. |
| CHROMIUM_ycbcr_422_image 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. |
| |
| 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 |
| |
| The command |
| |
| void glCopyTextureCHROMIUM (GLenum target, GLenum source_id, |
| GLenum dest_id, |
| GLint internal_format, GLenum dest_type, |
| GLboolean unpack_flip_y, |
| GLboolean unpack_premultiply_alpha, |
| GLboolean unpack_unmultiply_alpha) |
| |
| Copies the contents of texture referred to by <source_id> to <dest_id> |
| texture. If <source_id> texture is not defined or has different dimension |
| to <dest_id> texture, define <source_id> texture same 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 destination texture is converted to that |
| specified by <internal_format>. Must be one of the following symbolic |
| constants: GL_RGB, GL_RGBA |
| The internal format of <source_id> texture must be one of the following |
| symbolic constants: GL_R8, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, |
| GL_RGB, GL_RGBA, GL_BGRA_EXT, GL_RGB_YCBCR_422_CHROMIUM |
| When <source_id> texture doens't contain a superset of the component |
| required by <internal_format>, fill the components by following rules. |
| |
| source format color components |
| ===================================================== |
| GL_ALPHA (0, 0, 0, A) |
| GL_R8 (R, 0, 0, 1) |
| GL_LUMINANCE (L, L, L, 1) |
| GL_LUMINANCE_ALPHA (L, L, L, A) |
| GL_RGB (R, G, B, 1) |
| GL_RGBA (R, G, B, A) |
| GL_BGRA_EXT (R, G, B, A) |
| GL_RGB_YCBCR_422_CHROMIUM (R, G, B, 1) |
| |
| The format type of the destination texture is converted to that specified |
| by <dest_type>. |
| |
| <target> uses the same parameters as TexImage2D. |
| |
| If <flip_y> is true, vertically flip texture image data. |
| |
| If <unpack_premultiply_alpha> and <unpack_unmultiply_alpha> are true, |
| no alpha processing occurs. This is the equivalent of having neither flag |
| set. |
| |
| INVALID_OPERATION is generated if <internal_format> is not one of the valid formats |
| described above. |
| |
| INVALID_OPERATION is generated if the internal format of <source_id> is not one of |
| formats from the table above. |
| |
| 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, GL_TEXTURE_RECTANGLE_ARB or |
| GL_TEXTURE_EXTERNAL_OES objects. |
| |
| INVALID_VALUE is generated if level 0 of the source texture is not defined. |
| |
| The command |
| |
| void glCopySubTextureCHROMIUM (GLenum target, GLenum source_id, |
| GLenum dest_id, |
| GLint xoffset, GLint yoffset, |
| GLint x, GLint y, |
| GLsizei width, GLsizei height, |
| GLboolean unpack_flip_y, |
| GLboolean unpack_premultiply_alpha, |
| GLboolean unpack_unmultiply_alpha) |
| |
| Copies the sub contents of texture referred to by <source_id> to <dest_id> |
| texture without redefining <dest_id> texture. |
| |
| See CopyTextureCHROMIUM for the interpretation of the <target>, <flip_y>, |
| <premultiply_alpha>, and <unmultiply_alpha> arguments. |
| |
| <xoffset> and <yoffset> specify a texel offset in the x and y direction |
| respectively within the destination texture. |
| |
| <x> and <y> specify specify a texel offset in the x and y direction |
| respectively within the source texture. |
| |
| <width> specifies the width of the texture subimage. |
| |
| <height> specifies the width of the texture subimage. |
| |
| INVALID_OPERATION is generated if source internal_format and destination |
| internal_format are not one of the valid formats described above. |
| |
| INVALID_VALUE is generated if <target> is not GL_TEXTURE_2D. |
| |
| INVALID_OPERATION is generated if the destination texture has not been |
| defined. |
| |
| INVALID_VALUE is generated if level 0 of the source texture or |
| the destination texture is not defined. |
| |
| INVALID_VALUE is generated if <xoffset> < 0 , or <yoffset> < 0. |
| |
| INVALID_VALUE is generated if (<xoffset> + <width>) > dest_width, |
| or (<yoffset> + <height>) > dest_height. |
| |
| Dependencies on ARB_texture_rg |
| |
| If ARB_texture_rg is not supported: |
| * delete any reference to the R8 format. |
| |
| Dependencies on CHROMIUM_ycbcr_422_image |
| |
| If CHROMIUM_ycbcr_422_image is not supported: |
| * delete any reference to the RGB_YCBCR_422_CHROMIUM format. |
| |
| 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() |
| 16/7/2014 Add GL_TEXTURE_RECTANGLE_ARB as valid source_id target |
| 19/6/2015 Add arguments unpack_flip_y, unpack_premultiply_alpha, and |
| unpack_unmultiply_alpha to both commands. |
