| Name |
| |
| CHROMIUM_unpremultiply_and_dither_copy |
| |
| Name Strings |
| |
| GL_CHROMIUM_unpremultiply_and_dither_copy |
| |
| Version |
| |
| Last Modifed Date: Feb 01, 2018 |
| |
| Dependencies |
| |
| OpenGL ES 2.0 or OpenGL ES 3.0 is required. |
| |
| EXT_texture_format_BGRA8888 affects the definition of this extension. |
| |
| Overview |
| |
| This extension performs a copy from one texture to a second texture, |
| unpremultiplying and dithering the texture in the process. Additionally, |
| it allows a subrect to be specified for the copy. |
| |
| Both textures: |
| - Must be the same size |
| - Have the same subrect |
| |
| The source texture: |
| - Must be RGBA. If EXT_texture_format_BGRA8888 or GLES3 is available, |
| the texture may be BGRA |
| - Will have data copied from level 0 |
| |
| The dest texture: |
| - Must be RGBA |
| - Must have type GL_UNSIGNED_SHORT_4_4_4_4 |
| - Will have data copied to level 0 |
| |
| In addition to the above, this extension inherits all source/dest |
| limitations from CHROMIUM_copy_texture. |
| |
| New Procedures and Functions |
| |
| void UnpremultiplyAndDitherCopyCHROMIUM(uint sourceId, |
| uint destId, |
| int x, |
| int y, |
| sizei width, |
| sizei height) |
| |
| Additions to the OpenGL ES 2.0 Specification |
| |
| The command |
| |
| UnpremultiplyAndDitherCopyCHROMIUM |
| |
| Copies the contents of level 0 of <sourceId> texture to level 0 and of |
| <destId> texture, performing an unpremultiply and dither during the copy. |
| |
| <destId> must be initialized and have: |
| - a target of TEXTURE_2D, TEXTURE_RECTANGLE_ARB. |
| - a format of GL_RGBA, or GL_BGRA if EXT_texture_format_BGRA8888 |
| or GLES3 is available. |
| - a data type of GL_UNSIGNED_SHORT_4_4_4_4. |
| |
| <sourceId> must be initialized and have: |
| - a target of TEXTURE_2D, TEXTURE_RECTANGLE_ARB, TEXTURE_EXTERNAL_OES. |
| - a format of GL_RGBA, or GL_BGRA if EXT_texture_format_BGRA8888 |
| or GLES3 is available. |
| |
| INVALID_OPERATION is generated if any of the above requirements is not met, |
| or if the source / dest combination violates any requirements of |
| CHROMIUM_copy_texture. |
| |
| Errors |
| |
| None. |
| |
| New Tokens |
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| None. |
| |
| New State |
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| None. |
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| Revision History |
| |
| 02/01/2018 Documented the extension |