зеркало из https://github.com/AvaloniaUI/angle.git
89 строки
2.5 KiB
Plaintext
89 строки
2.5 KiB
Plaintext
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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