1Name 2 3 CHROMIUM_copy_compressed_texture 4 5Name Strings 6 7 GL_CHROMIUM_copy_compressed_texture 8 9Version 10 11 Last Modifed Date: August 5, 2015 12 13Dependencies 14 15 OpenGL ES 2.0 is required. 16 17 GL_AMD_compressed_ATC_texture, GL_ATI_texture_compression_atitc, 18 GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt5, 19 GL_EXT_texture_compression_s3tc and GL_OES_compressed_ETC1_RGB8_texture 20 affects the definition of this extension. 21 22Overview 23 24 This extension provides functionality for copying compressed textures. It 25 adds a new function glCompressedCopyTextureCHROMIUM that works similarily 26 to glCopyTextureCHROMIUM, but for compressed textures. 27 28 Which compressed texture formats that this extension supports depends on 29 the supported texture compression formats of the host GPU. 30 31Issues 32 33 glCompressedCopyTextureCHROMIUM will first try to copy into a compressed 34 texture of the same format as the source texture. If unsucessful, the 35 destination texture format will be changed to GL_RGBA and the texture will 36 be stored uncompressed. 37 38New Procedures and Functions 39 40 The command 41 42 void glCompressedCopyTextureCHROMIUM (GLuint source_id, GLuint dest_id) 43 44 Copies the contents of a compressed texture referred to by <source_id> to 45 <dest_id> texture. 46 47 Texture level 0 is copied from the source image to level 0 of the 48 destination texture. 49 50 The internal format of the source texture must be one of the following 51 symbolic constants: GL_ATC_RGB_AMD, GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD, 52 GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, 53 GL_ETC1_RGB8_OES 54 55 The destination texture will be created or replaced with the same internal 56 format as the source texture. 57 58 INVALID_OPERATION is generated if internal format of source texture is not 59 one of the valid formats described above. 60 61 INVALID_OPERATION is generated if destination texture is immutable. 62 63 INVALID_VALUE is generated if <source_id> or <dest_id> are not valid texture 64 objects. 65 66 INVALID_VALUE is generated if textures corresponding to <dest_id> have not 67 been bound as GL_TEXTURE_2D object. 68 69 INVALID_VALUE is generated if level 0 of the source texture is not defined. 70 71Errors 72 73 None. 74 75New Tokens 76 77 None. 78 79New State 80 81 None. 82 83Revision History 84 85 15/6/2015 Documented the extension. 86 5/8/2015 Added glCompressedCopySubTextureCHROMIUM. 87 1/6/2016 Remove glCompressedCopySubTextureCHROMIUM. 88 1/8/2016 Remove <target> argument. 89