1 Name 2 3 CHROMIUM_copy_texture 4 5 Name Strings 6 7 GL_CHROMIUM_copy_texture 8 9 Version 10 11 Last Modifed Date: July 16, 2014 12 13 Dependencies 14 15 OpenGL ES 2.0 is required. 16 17 CHROMIUM_flipy affects the definition of this extension. 18 EXT_texture_format_BGRA8888 affects the definition of this extension. 19 20 Overview 21 22 This extension expands on the functionality provided by the 23 glCopyTexImage2D command. A new function is exported, 24 glCopyTextureCHROMIUM, that performs the same copy operation as 25 glCopyTexImage2D, while respecting the pixel-storage modifiers 26 UNPACK_FLIP_Y_CHROMIUM, GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM and 27 GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM. 28 29 If GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM and 30 GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM are enabled. Then no alpha 31 processing occurs. This is the equivalent of having neither flag set. 32 33 The extension also supports copying BGRA textures and copying 34 EXTERNAL_OES texture to BGRA texture, which is not explicitly 35 granted by EXT_texture_format_BGRA8888. 36 37 New Procedures and Functions 38 39 void glCopyTextureCHROMIUM (GLenum target, GLenum source_id, 40 GLenum dest_id, GLint level, 41 GLint internal_format, GLenum dest_type) 42 43 Copies the contents of texture referred to by <source_id> to texture 44 <dest_id>. 45 46 Texture level 0 is copied from the source image to level <level> of the 47 destination texture. The level parameter must be 0 at present. 48 49 The internal format of the destination texture is converted to that 50 specified by <internal_format>. Must be one of the following symbolic 51 constants: GL_RGB, GL_RGBA 52 The internal format of <source_id> texture must be one of the following 53 symbolic constants: GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_RGB, 54 GL_RGBA, GL_BGRA_EXT 55 When <source_id> texture doens't contain a superset of the component 56 required by <internal_format>, fill the components by following rules. 57 58 source format color components 59 ================================================= 60 GL_ALPHA (0, 0, 0, A) 61 GL_LUMINANCE (L, L, L, 1) 62 GL_LUMINANCE_ALPHA (L, L, L, A) 63 GL_RGB (R, G, B, 1) 64 GL_RGBA (R, G, B, A) 65 GL_BGRA_EXT (R, G, B, A) 66 67 The format type of the destination texture is converted to that specified 68 by <dest_type>. 69 70 <target> uses the same parameters as TexImage2D. 71 72 INVALID_OPERATION is generated if <internal_format> is not one of the valid formats 73 described above. 74 75 INVALID_OPERATION is generated if the internal format of <source_id> is not one of 76 formats from the table above. 77 78 INVALID_VALUE is generated if <target> is not GL_TEXTURE_2D. 79 80 INVALID_VALUE is generated if <source_id> or <dest_id> are not valid texture 81 objects. 82 83 INVALID_VALUE is generated if textures corresponding to <dest_id> have not 84 been bound as GL_TEXTURE_2D object. 85 86 INVALID_VALUE is generated if textures corresponding to <source_id> have not 87 been bound as GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_ARB or 88 GL_TEXTURE_EXTERNAL_OES objects. 89 90 INVALID_VALUE is generated if <level> is not a valid level of the 91 destination texture, or if level 0 of the source texture is not defined. 92 93 Errors 94 95 None. 96 97 New Tokens 98 99 None. 100 101 New State 102 103 None. 104 105 Revision History 106 107 8/1/2011 Documented the extension 108 7/4/2013 Add a new parameter dest_type to glCopyTextureCHROMIUM() 109 16/7/2014 Add GL_TEXTURE_RECTANGLE_ARB as valid source_id target. 110
