Class EXTTextureCompressionRGTC
This extension introduces four new block-based texture compression formats suited for unsigned and signed red and red-green textures (hence the name "rgtc" for Red-Green Texture Compression).
These formats are designed to reduce the storage requirements and memory bandwidth required for red and red-green textures by a factor of 2-to-1 over
conventional uncompressed luminance and luminance-alpha textures with 8-bit components (LUMINANCE8_EXT
and LUMINANCE8_ALPHA8_EXT
).
The compressed signed red-green format is reasonably suited for storing compressed normal maps.
This extension uses the same compression format as the EXT_texture_compression_latc extension except the color data is stored in the red and green components rather than luminance and alpha. Representing compressed red and green components is consistent with the BC4 and BC5 compressed formats supported by DirectX 10.
Requires GLES 3.0
.
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
Accepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.static final int
Accepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.static final int
Accepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.static final int
Accepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
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Method Summary
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Field Details
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GL_COMPRESSED_RED_RGTC1_EXT
public static final int GL_COMPRESSED_RED_RGTC1_EXTAccepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.- See Also:
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GL_COMPRESSED_SIGNED_RED_RGTC1_EXT
public static final int GL_COMPRESSED_SIGNED_RED_RGTC1_EXTAccepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.- See Also:
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GL_COMPRESSED_RED_GREEN_RGTC2_EXT
public static final int GL_COMPRESSED_RED_GREEN_RGTC2_EXTAccepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.- See Also:
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GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT
public static final int GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXTAccepted by theinternalFormat
parameter ofTexImage2D
,TexStorage2D
, andCompressedTexImage2D
and theformat
parameter ofCompressedTexSubImage2D
.- See Also:
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