Struct webgl_stdweb::WEBGL_compressed_texture_etc

pub struct WEBGL_compressed_texture_etc(_);

Extension

This extension exposes the compressed texture formats defined as core in the OpenGL ES 3.0 spec to WebGL. These include the ETC2 and EAC formats, where ETC2 is a superset of ETC1. ETC1 textures can be loaded using the ETC2 token value. All of these formats are in the ETC family.

Browsers should not advertise this extension when the WebGL implementation, or graphics driver, supports these formats by decompressing them. Compression formats COMPRESSED_R11_EAC, COMPRESSED_SIGNED_R11_EAC, COMPRESSED_RG11_EAC, COMPRESSED_SIGNED_RG11_EAC, COMPRESSED_RGB8_ETC2, COMPRESSED_SRGB8_ETC2, COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2, COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2, COMPRESSED_RGBA8_ETC2_EAC, and COMPRESSED_SRGB8_ALPHA8_ETC2_EAC may be passed to the compressedTexImage2D and compressedTexSubImage2D entry points. In WebGL 2.0, they may also be passed to the compressedTexImage3D and compressedTexSubImage3D entry points with the TEXTURE_2D_ARRAY target. Calling getParameter with the argument COMPRESSED_TEXTURE_FORMATS will include the formats from this specification. For all of the formats, validatedSize (defined for each specific format below) is validated in the following ways:

• WebGL 1.0 and 2.0: if the variant of compressedTexImageD or compressedTexSubImageD taking ArrayBufferView pixels is called, then the byteLength of the view must be equal to validatedSize, or an INVALID_VALUE error is generated.
• WebGL 2.0: if the variant of compressedTexImageD or compressedTexSubImageD taking GLintptr offset is called, and offset + validatedSize is greater than the size of the bound PIXEL_UNPACK_BUFFER, an INVALID_OPERATION error is generated.

COMPRESSED_R11_EAC COMPRESSED_SIGNED_R11_EAC COMPRESSED_RGB8_ETC2 COMPRESSED_SRGB8_ETC2 COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2

validatedSize is computed in the following way:

floor((width + 3) / 4) * floor((height + 3) / 4) * 8 COMPRESSED_RG11_EAC COMPRESSED_SIGNED_RG11_EAC COMPRESSED_RGBA8_ETC2_EAC COMPRESSED_SRGB8_ALPHA8_ETC2_EAC

validatedSize is computed in the following way:

floor((width + 3) / 4) * floor((height + 3) / 4) * 16

Implementations

impl WEBGL_compressed_texture_etc

pub const COMPRESSED_R11_EAC: GLenum = 37_488u32

pub const COMPRESSED_RG11_EAC: GLenum = 37_490u32

pub const COMPRESSED_RGB8_ETC2: GLenum = 37_492u32

pub const COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: GLenum = 37_494u32

pub const COMPRESSED_RGBA8_ETC2_EAC: GLenum = 37_496u32

pub const COMPRESSED_SIGNED_R11_EAC: GLenum = 37_489u32

pub const COMPRESSED_SIGNED_RG11_EAC: GLenum = 37_491u32

pub const COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: GLenum = 37_497u32

pub const COMPRESSED_SRGB8_ETC2: GLenum = 37_493u32

pub const COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: GLenum = 37_495u32

Trait Implementations

impl AsRef<Reference> for WEBGL_compressed_texture_etc

fn as_ref(&self) -> &Reference

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for WEBGL_compressed_texture_etc

fn clone(&self) -> WEBGL_compressed_texture_etc

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WEBGL_compressed_texture_etc

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Extension for WEBGL_compressed_texture_etc

const NAME: &'static str = "WEBGL_compressed_texture_etc"

impl From<WEBGL_compressed_texture_etc> for Reference

fn from(value: WEBGL_compressed_texture_etc) -> Self

Converts to this type from the input type.

impl InstanceOf for WEBGL_compressed_texture_etc

fn instance_of(_reference: &Reference) -> bool

Checks whenever a given Reference if of type Self.

impl ReferenceType for WEBGL_compressed_texture_etc

unsafe fn from_reference_unchecked(reference: Reference) -> Self

Converts a given reference into a concrete reference-like wrapper. Doesn’t do any type checking; highly unsafe to use!

impl<'_r> TryFrom<&'_r Reference> for WEBGL_compressed_texture_etc

type Error = ConversionError

The type returned in the event of a conversion error.

fn try_from(reference: &Reference) -> Result<Self, Self::Error>

Performs the conversion.

impl<'_r> TryFrom<&'_r Value> for WEBGL_compressed_texture_etc

type Error = ConversionError

The type returned in the event of a conversion error.

fn try_from(value: &Value) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Reference> for WEBGL_compressed_texture_etc

type Error = ConversionError

The type returned in the event of a conversion error.

fn try_from(reference: Reference) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Value> for WEBGL_compressed_texture_etc

type Error = ConversionError

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<WEBGL_compressed_texture_etc> for Reference

type Error = Void

The type returned in the event of a conversion error.

fn try_from(value: WEBGL_compressed_texture_etc) -> Result<Self, Self::Error>

Performs the conversion.

impl JsSerialize for WEBGL_compressed_texture_etc