Baseline Widely available
Note: This feature is available in Web Workers.
The WebGLRenderingContext.compressedTexSubImage2D() method of the WebGL API specifies a two-dimensional sub-rectangle for a texture image in a compressed format.
Compressed image formats must be enabled by WebGL extensions before using this method or a WebGL2RenderingContext must be used.
// WebGL 1:
compressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, srcData)
// Additionally available in WebGL 2:
compressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, imageSize, offset)
compressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, srcData)
compressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, srcData, srcOffset)
compressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, srcData, srcOffset, srcLengthOverride)
target
A GLenum specifying the binding point (target) of the active compressed texture. Possible values:
gl.TEXTURE_2D: A two-dimensional texture.gl.TEXTURE_CUBE_MAP_POSITIVE_X: Positive X face for a cube-mapped texture.gl.TEXTURE_CUBE_MAP_NEGATIVE_X: Negative X face for a cube-mapped texture.gl.TEXTURE_CUBE_MAP_POSITIVE_Y: Positive Y face for a cube-mapped texture.gl.TEXTURE_CUBE_MAP_NEGATIVE_Y: Negative Y face for a cube-mapped texture.gl.TEXTURE_CUBE_MAP_POSITIVE_Z: Positive Z face for a cube-mapped texture.gl.TEXTURE_CUBE_MAP_NEGATIVE_Z: Negative Z face for a cube-mapped texture.level
A GLint specifying the level of detail. Level 0 is the base image level and level n is the n-th mipmap reduction level.
xoffset
A GLint specifying the horizontal offset within the compressed texture image.
yoffset
A GLint specifying the vertical offset within the compressed texture image.
width
A GLsizei specifying the width of the compressed texture.
height
A GLsizei specifying the height of the compressed texture.
format
A GLenum specifying the compressed image format. Compressed image formats must be enabled by WebGL extensions before using this method. Possible values:
When using the WEBGL_compressed_texture_s3tc extension:
ext.COMPRESSED_RGB_S3TC_DXT1_EXText.COMPRESSED_RGBA_S3TC_DXT1_EXText.COMPRESSED_RGBA_S3TC_DXT3_EXText.COMPRESSED_RGBA_S3TC_DXT5_EXTWhen using the WEBGL_compressed_texture_s3tc_srgb extension:
ext.COMPRESSED_SRGB_S3TC_DXT1_EXText.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXText.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXText.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXTWhen using the WEBGL_compressed_texture_etc extension:
ext.COMPRESSED_R11_EACext.COMPRESSED_SIGNED_R11_EACext.COMPRESSED_RG11_EACext.COMPRESSED_SIGNED_RG11_EACext.COMPRESSED_RGB8_ETC2ext.COMPRESSED_RGBA8_ETC2_EACext.COMPRESSED_SRGB8_ETC2ext.COMPRESSED_SRGB8_ALPHA8_ETC2_EACext.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2ext.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2When using the WEBGL_compressed_texture_pvrtc extension:
ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMGext.COMPRESSED_RGBA_PVRTC_4BPPV1_IMGext.COMPRESSED_RGB_PVRTC_2BPPV1_IMGext.COMPRESSED_RGBA_PVRTC_2BPPV1_IMGWhen using the WEBGL_compressed_texture_astc extension:
ext.COMPRESSED_RGBA_ASTC_4x4_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHRext.COMPRESSED_RGBA_ASTC_5x4_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHRext.COMPRESSED_RGBA_ASTC_5x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHRext.COMPRESSED_RGBA_ASTC_6x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHRext.COMPRESSED_RGBA_ASTC_6x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHRext.COMPRESSED_RGBA_ASTC_8x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHRext.COMPRESSED_RGBA_ASTC_8x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHRext.COMPRESSED_RGBA_ASTC_8x8_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHRext.COMPRESSED_RGBA_ASTC_10x5_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHRext.COMPRESSED_RGBA_ASTC_10x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHRext.COMPRESSED_RGBA_ASTC_10x6_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHRext.COMPRESSED_RGBA_ASTC_10x10_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHRext.COMPRESSED_RGBA_ASTC_12x10_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHRext.COMPRESSED_RGBA_ASTC_12x12_KHR ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHRWhen using the EXT_texture_compression_bptc extension:
ext.COMPRESSED_RGBA_BPTC_UNORM_EXText.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXText.COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXText.COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXTWhen using the EXT_texture_compression_rgtc extension:
ext.COMPRESSED_RED_RGTC1_EXText.COMPRESSED_SIGNED_RED_RGTC1_EXText.COMPRESSED_RED_GREEN_RGTC2_EXText.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXTimageSize
A GLsizei specifying the number of bytes to read from the buffer bound to gl.PIXEL_UNPACK_BUFFER.
offset
A GLintptr specifying the offset in bytes from which to read from the buffer bound to gl.PIXEL_UNPACK_BUFFER.
srcData
A TypedArray or a DataView that will be used as a data store for the compressed image data in memory.
None (undefined).
const ext =
gl.getExtension("WEBGL_compressed_texture_s3tc") ||
gl.getExtension("MOZ_WEBGL_compressed_texture_s3tc") ||
gl.getExtension("WEBKIT_WEBGL_compressed_texture_s3tc");
gl.compressedTexSubImage2D(
gl.TEXTURE_2D,
0,
256,
256,
512,
512,
ext.COMPRESSED_RGBA_S3TC_DXT5_EXT,
textureData,
);
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4