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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/angle
 Path: blob/main_old/extensions/CHROMIUM_compressed_copy_texture.txt
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Name

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    CHROMIUM_copy_compressed_texture

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Name Strings

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    GL_CHROMIUM_copy_compressed_texture

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Version

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    Last Modifed Date: August 5, 2015

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Dependencies

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    OpenGL ES 2.0 is required.

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    GL_AMD_compressed_ATC_texture, GL_ATI_texture_compression_atitc,

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    GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt5,

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    GL_EXT_texture_compression_s3tc and GL_OES_compressed_ETC1_RGB8_texture

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    affects the definition of this extension.

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Overview

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    This extension provides functionality for copying compressed textures. It

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    adds a new function glCompressedCopyTextureCHROMIUM that works similarily

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    to glCopyTextureCHROMIUM, but for compressed textures.

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    Which compressed texture formats that this extension supports depends on

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    the supported texture compression formats of the host GPU.

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Issues

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    glCompressedCopyTextureCHROMIUM will first try to copy into a compressed

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    texture of the same format as the source texture. If unsucessful, the

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    destination texture format will be changed to GL_RGBA and the texture will

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    be stored uncompressed.

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New Procedures and Functions

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    The command

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        void glCompressedCopyTextureCHROMIUM (GLuint source_id, GLuint dest_id)

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    Copies the contents of a compressed texture referred to by <source_id> to

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    <dest_id> texture.

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    Texture level 0 is copied from the source image to level 0 of the

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    destination texture.

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    The internal format of the source texture must be one of the following

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    symbolic constants: GL_ATC_RGB_AMD, GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD,

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    GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,

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    GL_ETC1_RGB8_OES

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    The destination texture will be created or replaced with the same internal

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    format as the source texture.

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    INVALID_OPERATION is generated if internal format of source texture is not

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    one of the valid formats described above.

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    INVALID_OPERATION is generated if destination texture is immutable.

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    INVALID_VALUE is generated if <source_id> or <dest_id> are not valid texture

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    objects.

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    INVALID_VALUE is generated if textures corresponding to <dest_id> have not

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    been bound as GL_TEXTURE_2D object.

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    INVALID_VALUE is generated if level 0 of the source texture is not defined.

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Errors

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    None.

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New Tokens

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    None.

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New State

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    None.

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Revision History

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    15/6/2015    Documented the extension.

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    5/8/2015     Added glCompressedCopySubTextureCHROMIUM.

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    1/6/2016     Remove glCompressedCopySubTextureCHROMIUM.

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    1/8/2016     Remove <target> argument.

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