org.lwjgl.opengles

Class EXTTextureCompressionDXT1

java.lang.Object

org.lwjgl.opengles.EXTTextureCompressionDXT1

public final class EXTTextureCompressionDXT1
extends java.lang.Object

Native bindings to the EXT_texture_compression_dxt1 extension.

Support of EXT_texture_compression_s3tc is attractive for OpenGL-ES implementations because it provides compressed textures that allow for significantly reduced texture storage. Reducing texture storage is advantageous because of the smaller memory capacity of many embedded systems compared to desktop systems. Smaller textures also provide a welcome performance advantage since embedded platforms typically provide less performance than desktop systems. S3TC compressed textures are widely supported and used by applications. The DXT1 format is used in the vast majority of cases in which S3TC compressed textures are used.

However, EXT_texture_compression_s3tc specifies functionality that is burdensome for an OpenGL-ES implementation. In particular it requires that the driver provide the capability to compress textures into S3TC texture formats, as an S3TC texture format is accepted as the internalformat parameter of TexImage2D and CopyTexImage2D. Further, EXT_texture_compression_s3tc may require conversion from one S3TC format to another during CompressedTexSubImage2D if the format parameter does not match the internalformat of the texture image previously created by TexImage2D.

In an OpenGL-ES implementation it is therefore advantageous to support a limited subset of EXT_texture_compression_s3tc: Restrict supported texture formats to DXT1 and restrict supported operations to those that do not require texture compression into an S3TC texture format or decompression from an S3TC texture format.

Field Summary

Fields

Modifier and Type	Field and Description
static int	GL_COMPRESSED_RGB_S3TC_DXT1_EXT Accepted by the internalformat parameter of CompressedTexImage2D and the format parameter of CompressedTexSubImage2D.
static int	GL_COMPRESSED_RGBA_S3TC_DXT1_EXT Accepted by the internalformat parameter of CompressedTexImage2D and the format parameter of CompressedTexSubImage2D.

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GL_COMPRESSED_RGB_S3TC_DXT1_EXT

public static final int GL_COMPRESSED_RGB_S3TC_DXT1_EXT

Accepted by the internalformat parameter of CompressedTexImage2D and the format parameter of CompressedTexSubImage2D.

See Also:

Constant Field Values

GL_COMPRESSED_RGBA_S3TC_DXT1_EXT

public static final int GL_COMPRESSED_RGBA_S3TC_DXT1_EXT

Accepted by the internalformat parameter of CompressedTexImage2D and the format parameter of CompressedTexSubImage2D.

See Also:

Constant Field Values