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impl super::AdapterShared {
pub(super) fn describe_texture_format(
&self,
texture_format: wgt::TextureFormat,
) -> super::TextureFormatDesc {
use wgt::TextureFormat as Tf;
use wgt::{AstcBlock, AstcChannel};
let (internal, external, data_type) = match texture_format {
Tf::R8Unorm => (glow::R8, glow::RED, glow::UNSIGNED_BYTE),
Tf::R8Snorm => (glow::R8_SNORM, glow::RED, glow::BYTE),
Tf::R8Uint => (glow::R8UI, glow::RED_INTEGER, glow::UNSIGNED_BYTE),
Tf::R8Sint => (glow::R8I, glow::RED_INTEGER, glow::BYTE),
Tf::R16Uint => (glow::R16UI, glow::RED_INTEGER, glow::UNSIGNED_SHORT),
Tf::R16Sint => (glow::R16I, glow::RED_INTEGER, glow::SHORT),
Tf::R16Unorm => (glow::R16, glow::RED, glow::UNSIGNED_SHORT),
Tf::R16Snorm => (glow::R16_SNORM, glow::RED, glow::SHORT),
Tf::R16Float => (glow::R16F, glow::RED, glow::HALF_FLOAT),
Tf::Rg8Unorm => (glow::RG8, glow::RG, glow::UNSIGNED_BYTE),
Tf::Rg8Snorm => (glow::RG8_SNORM, glow::RG, glow::BYTE),
Tf::Rg8Uint => (glow::RG8UI, glow::RG_INTEGER, glow::UNSIGNED_BYTE),
Tf::Rg8Sint => (glow::RG8I, glow::RG_INTEGER, glow::BYTE),
Tf::R32Uint => (glow::R32UI, glow::RED_INTEGER, glow::UNSIGNED_INT),
Tf::R32Sint => (glow::R32I, glow::RED_INTEGER, glow::INT),
Tf::R32Float => (glow::R32F, glow::RED, glow::FLOAT),
Tf::Rg16Uint => (glow::RG16UI, glow::RG_INTEGER, glow::UNSIGNED_SHORT),
Tf::Rg16Sint => (glow::RG16I, glow::RG_INTEGER, glow::SHORT),
Tf::Rg16Unorm => (glow::RG16, glow::RG, glow::UNSIGNED_SHORT),
Tf::Rg16Snorm => (glow::RG16_SNORM, glow::RG, glow::SHORT),
Tf::Rg16Float => (glow::RG16F, glow::RG, glow::HALF_FLOAT),
Tf::Rgba8Unorm => (glow::RGBA8, glow::RGBA, glow::UNSIGNED_BYTE),
Tf::Rgba8UnormSrgb => (glow::SRGB8_ALPHA8, glow::RGBA, glow::UNSIGNED_BYTE),
Tf::Bgra8UnormSrgb => (glow::SRGB8_ALPHA8, glow::BGRA, glow::UNSIGNED_BYTE), //TODO?
Tf::Rgba8Snorm => (glow::RGBA8_SNORM, glow::RGBA, glow::BYTE),
Tf::Bgra8Unorm => (glow::RGBA8, glow::BGRA, glow::UNSIGNED_BYTE), //TODO?
Tf::Rgba8Uint => (glow::RGBA8UI, glow::RGBA_INTEGER, glow::UNSIGNED_BYTE),
Tf::Rgba8Sint => (glow::RGBA8I, glow::RGBA_INTEGER, glow::BYTE),
Tf::Rgb10a2Uint => (
glow::RGB10_A2UI,
glow::RGBA_INTEGER,
glow::UNSIGNED_INT_2_10_10_10_REV,
),
Tf::Rgb10a2Unorm => (
glow::RGB10_A2,
glow::RGBA,
glow::UNSIGNED_INT_2_10_10_10_REV,
),
Tf::Rg11b10Ufloat => (
glow::R11F_G11F_B10F,
glow::RGB,
glow::UNSIGNED_INT_10F_11F_11F_REV,
),
Tf::Rg32Uint => (glow::RG32UI, glow::RG_INTEGER, glow::UNSIGNED_INT),
Tf::Rg32Sint => (glow::RG32I, glow::RG_INTEGER, glow::INT),
Tf::Rg32Float => (glow::RG32F, glow::RG, glow::FLOAT),
Tf::Rgba16Uint => (glow::RGBA16UI, glow::RGBA_INTEGER, glow::UNSIGNED_SHORT),
Tf::Rgba16Sint => (glow::RGBA16I, glow::RGBA_INTEGER, glow::SHORT),
Tf::Rgba16Unorm => (glow::RGBA16, glow::RGBA, glow::UNSIGNED_SHORT),
Tf::Rgba16Snorm => (glow::RGBA16_SNORM, glow::RGBA, glow::SHORT),
Tf::Rgba16Float => (glow::RGBA16F, glow::RGBA, glow::HALF_FLOAT),
Tf::Rgba32Uint => (glow::RGBA32UI, glow::RGBA_INTEGER, glow::UNSIGNED_INT),
Tf::Rgba32Sint => (glow::RGBA32I, glow::RGBA_INTEGER, glow::INT),
Tf::Rgba32Float => (glow::RGBA32F, glow::RGBA, glow::FLOAT),
Tf::Stencil8 => (
glow::STENCIL_INDEX8,
glow::STENCIL_INDEX,
glow::UNSIGNED_BYTE,
),
Tf::Depth16Unorm => (
glow::DEPTH_COMPONENT16,
glow::DEPTH_COMPONENT,
glow::UNSIGNED_SHORT,
),
Tf::Depth32Float => (glow::DEPTH_COMPONENT32F, glow::DEPTH_COMPONENT, glow::FLOAT),
Tf::Depth32FloatStencil8 => (
glow::DEPTH32F_STENCIL8,
glow::DEPTH_STENCIL,
glow::FLOAT_32_UNSIGNED_INT_24_8_REV,
),
Tf::Depth24Plus => (
glow::DEPTH_COMPONENT24,
glow::DEPTH_COMPONENT,
glow::UNSIGNED_INT,
),
Tf::Depth24PlusStencil8 => (
glow::DEPTH24_STENCIL8,
glow::DEPTH_STENCIL,
glow::UNSIGNED_INT_24_8,
),
Tf::NV12 => unreachable!(),
Tf::Rgb9e5Ufloat => (glow::RGB9_E5, glow::RGB, glow::UNSIGNED_INT_5_9_9_9_REV),
Tf::Bc1RgbaUnorm => (glow::COMPRESSED_RGBA_S3TC_DXT1_EXT, glow::RGBA, 0),
Tf::Bc1RgbaUnormSrgb => (glow::COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT, glow::RGBA, 0),
Tf::Bc2RgbaUnorm => (glow::COMPRESSED_RGBA_S3TC_DXT3_EXT, glow::RGBA, 0),
Tf::Bc2RgbaUnormSrgb => (glow::COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, glow::RGBA, 0),
Tf::Bc3RgbaUnorm => (glow::COMPRESSED_RGBA_S3TC_DXT5_EXT, glow::RGBA, 0),
Tf::Bc3RgbaUnormSrgb => (glow::COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT, glow::RGBA, 0),
Tf::Bc4RUnorm => (glow::COMPRESSED_RED_RGTC1, glow::RED, 0),
Tf::Bc4RSnorm => (glow::COMPRESSED_SIGNED_RED_RGTC1, glow::RED, 0),
Tf::Bc5RgUnorm => (glow::COMPRESSED_RG_RGTC2, glow::RG, 0),
Tf::Bc5RgSnorm => (glow::COMPRESSED_SIGNED_RG_RGTC2, glow::RG, 0),
Tf::Bc6hRgbUfloat => (glow::COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT, glow::RGB, 0),
Tf::Bc6hRgbFloat => (glow::COMPRESSED_RGB_BPTC_SIGNED_FLOAT, glow::RGB, 0),
Tf::Bc7RgbaUnorm => (glow::COMPRESSED_RGBA_BPTC_UNORM, glow::RGBA, 0),
Tf::Bc7RgbaUnormSrgb => (glow::COMPRESSED_SRGB_ALPHA_BPTC_UNORM, glow::RGBA, 0),
Tf::Etc2Rgb8Unorm => (glow::COMPRESSED_RGB8_ETC2, glow::RGB, 0),
Tf::Etc2Rgb8UnormSrgb => (glow::COMPRESSED_SRGB8_ETC2, glow::RGB, 0),
Tf::Etc2Rgb8A1Unorm => (
glow::COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2,
glow::RGBA,
0,
),
Tf::Etc2Rgb8A1UnormSrgb => (
glow::COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2,
glow::RGBA,
0,
),
Tf::Etc2Rgba8Unorm => (glow::COMPRESSED_RGBA8_ETC2_EAC, glow::RGBA, 0),
Tf::Etc2Rgba8UnormSrgb => (glow::COMPRESSED_SRGB8_ALPHA8_ETC2_EAC, glow::RGBA, 0),
Tf::EacR11Unorm => (glow::COMPRESSED_R11_EAC, glow::RED, 0),
Tf::EacR11Snorm => (glow::COMPRESSED_SIGNED_R11_EAC, glow::RED, 0),
Tf::EacRg11Unorm => (glow::COMPRESSED_RG11_EAC, glow::RG, 0),
Tf::EacRg11Snorm => (glow::COMPRESSED_SIGNED_RG11_EAC, glow::RG, 0),
Tf::Astc { block, channel } => match channel {
AstcChannel::Unorm | AstcChannel::Hdr => match block {
AstcBlock::B4x4 => (glow::COMPRESSED_RGBA_ASTC_4x4_KHR, glow::RGBA, 0),
AstcBlock::B5x4 => (glow::COMPRESSED_RGBA_ASTC_5x4_KHR, glow::RGBA, 0),
AstcBlock::B5x5 => (glow::COMPRESSED_RGBA_ASTC_5x5_KHR, glow::RGBA, 0),
AstcBlock::B6x5 => (glow::COMPRESSED_RGBA_ASTC_6x5_KHR, glow::RGBA, 0),
AstcBlock::B6x6 => (glow::COMPRESSED_RGBA_ASTC_6x6_KHR, glow::RGBA, 0),
AstcBlock::B8x5 => (glow::COMPRESSED_RGBA_ASTC_8x5_KHR, glow::RGBA, 0),
AstcBlock::B8x6 => (glow::COMPRESSED_RGBA_ASTC_8x6_KHR, glow::RGBA, 0),
AstcBlock::B8x8 => (glow::COMPRESSED_RGBA_ASTC_8x8_KHR, glow::RGBA, 0),
AstcBlock::B10x5 => (glow::COMPRESSED_RGBA_ASTC_10x5_KHR, glow::RGBA, 0),
AstcBlock::B10x6 => (glow::COMPRESSED_RGBA_ASTC_10x6_KHR, glow::RGBA, 0),
AstcBlock::B10x8 => (glow::COMPRESSED_RGBA_ASTC_10x8_KHR, glow::RGBA, 0),
AstcBlock::B10x10 => (glow::COMPRESSED_RGBA_ASTC_10x10_KHR, glow::RGBA, 0),
AstcBlock::B12x10 => (glow::COMPRESSED_RGBA_ASTC_12x10_KHR, glow::RGBA, 0),
AstcBlock::B12x12 => (glow::COMPRESSED_RGBA_ASTC_12x12_KHR, glow::RGBA, 0),
},
AstcChannel::UnormSrgb => match block {
AstcBlock::B4x4 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR, glow::RGBA, 0),
AstcBlock::B5x4 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR, glow::RGBA, 0),
AstcBlock::B5x5 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR, glow::RGBA, 0),
AstcBlock::B6x5 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR, glow::RGBA, 0),
AstcBlock::B6x6 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR, glow::RGBA, 0),
AstcBlock::B8x5 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR, glow::RGBA, 0),
AstcBlock::B8x6 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR, glow::RGBA, 0),
AstcBlock::B8x8 => (glow::COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR, glow::RGBA, 0),
AstcBlock::B10x5 => {
(glow::COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR, glow::RGBA, 0)
}
AstcBlock::B10x6 => {
(glow::COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR, glow::RGBA, 0)
}
AstcBlock::B10x8 => {
(glow::COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR, glow::RGBA, 0)
}
AstcBlock::B10x10 => {
(glow::COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR, glow::RGBA, 0)
}
AstcBlock::B12x10 => {
(glow::COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR, glow::RGBA, 0)
}
AstcBlock::B12x12 => {
(glow::COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR, glow::RGBA, 0)
}
},
},
};
super::TextureFormatDesc {
internal,
external,
data_type,
}
}
}
pub(super) fn describe_vertex_format(vertex_format: wgt::VertexFormat) -> super::VertexFormatDesc {
use super::VertexAttribKind as Vak;
use wgt::VertexFormat as Vf;
let (element_count, element_format, attrib_kind) = match vertex_format {
Vf::Unorm8x2 => (2, glow::UNSIGNED_BYTE, Vak::Float),
Vf::Snorm8x2 => (2, glow::BYTE, Vak::Float),
Vf::Uint8x2 => (2, glow::UNSIGNED_BYTE, Vak::Integer),
Vf::Sint8x2 => (2, glow::BYTE, Vak::Integer),
Vf::Unorm8x4 => (4, glow::UNSIGNED_BYTE, Vak::Float),
Vf::Snorm8x4 => (4, glow::BYTE, Vak::Float),
Vf::Uint8x4 => (4, glow::UNSIGNED_BYTE, Vak::Integer),
Vf::Sint8x4 => (4, glow::BYTE, Vak::Integer),
Vf::Unorm16x2 => (2, glow::UNSIGNED_SHORT, Vak::Float),
Vf::Snorm16x2 => (2, glow::SHORT, Vak::Float),
Vf::Uint16x2 => (2, glow::UNSIGNED_SHORT, Vak::Integer),
Vf::Sint16x2 => (2, glow::SHORT, Vak::Integer),
Vf::Float16x2 => (2, glow::HALF_FLOAT, Vak::Float),
Vf::Unorm16x4 => (4, glow::UNSIGNED_SHORT, Vak::Float),
Vf::Snorm16x4 => (4, glow::SHORT, Vak::Float),
Vf::Uint16x4 => (4, glow::UNSIGNED_SHORT, Vak::Integer),
Vf::Sint16x4 => (4, glow::SHORT, Vak::Integer),
Vf::Float16x4 => (4, glow::HALF_FLOAT, Vak::Float),
Vf::Uint32 => (1, glow::UNSIGNED_INT, Vak::Integer),
Vf::Sint32 => (1, glow::INT, Vak::Integer),
Vf::Float32 => (1, glow::FLOAT, Vak::Float),
Vf::Uint32x2 => (2, glow::UNSIGNED_INT, Vak::Integer),
Vf::Sint32x2 => (2, glow::INT, Vak::Integer),
Vf::Float32x2 => (2, glow::FLOAT, Vak::Float),
Vf::Uint32x3 => (3, glow::UNSIGNED_INT, Vak::Integer),
Vf::Sint32x3 => (3, glow::INT, Vak::Integer),
Vf::Float32x3 => (3, glow::FLOAT, Vak::Float),
Vf::Uint32x4 => (4, glow::UNSIGNED_INT, Vak::Integer),
Vf::Sint32x4 => (4, glow::INT, Vak::Integer),
Vf::Float32x4 => (4, glow::FLOAT, Vak::Float),
Vf::Unorm10_10_10_2 => (4, glow::UNSIGNED_INT_10_10_10_2, Vak::Float),
Vf::Float64 | Vf::Float64x2 | Vf::Float64x3 | Vf::Float64x4 => unimplemented!(),
};
super::VertexFormatDesc {
element_count,
element_format,
attrib_kind,
}
}
pub fn map_filter_modes(
min: wgt::FilterMode,
mag: wgt::FilterMode,
mip: wgt::FilterMode,
) -> (u32, u32) {
use wgt::FilterMode as Fm;
let mag_filter = match mag {
Fm::Nearest => glow::NEAREST,
Fm::Linear => glow::LINEAR,
};
let min_filter = match (min, mip) {
(Fm::Nearest, Fm::Nearest) => glow::NEAREST_MIPMAP_NEAREST,
(Fm::Nearest, Fm::Linear) => glow::NEAREST_MIPMAP_LINEAR,
(Fm::Linear, Fm::Nearest) => glow::LINEAR_MIPMAP_NEAREST,
(Fm::Linear, Fm::Linear) => glow::LINEAR_MIPMAP_LINEAR,
};
(min_filter, mag_filter)
}
pub fn map_address_mode(mode: wgt::AddressMode) -> u32 {
match mode {
wgt::AddressMode::Repeat => glow::REPEAT,
wgt::AddressMode::MirrorRepeat => glow::MIRRORED_REPEAT,
wgt::AddressMode::ClampToEdge => glow::CLAMP_TO_EDGE,
wgt::AddressMode::ClampToBorder => glow::CLAMP_TO_BORDER,
//wgt::AddressMode::MirrorClamp => glow::MIRROR_CLAMP_TO_EDGE,
}
}
pub fn map_compare_func(fun: wgt::CompareFunction) -> u32 {
use wgt::CompareFunction as Cf;
match fun {
Cf::Never => glow::NEVER,
Cf::Less => glow::LESS,
Cf::LessEqual => glow::LEQUAL,
Cf::Equal => glow::EQUAL,
Cf::GreaterEqual => glow::GEQUAL,
Cf::Greater => glow::GREATER,
Cf::NotEqual => glow::NOTEQUAL,
Cf::Always => glow::ALWAYS,
}
}
pub fn map_primitive_topology(topology: wgt::PrimitiveTopology) -> u32 {
use wgt::PrimitiveTopology as Pt;
match topology {
Pt::PointList => glow::POINTS,
Pt::LineList => glow::LINES,
Pt::LineStrip => glow::LINE_STRIP,
Pt::TriangleList => glow::TRIANGLES,
Pt::TriangleStrip => glow::TRIANGLE_STRIP,
}
}
pub(super) fn map_primitive_state(state: &wgt::PrimitiveState) -> super::PrimitiveState {
super::PrimitiveState {
//Note: we are flipping the front face, so that
// the Y-flip in the generated GLSL keeps the same visibility.
// See `naga::back::glsl::WriterFlags::ADJUST_COORDINATE_SPACE`.
front_face: match state.front_face {
wgt::FrontFace::Cw => glow::CCW,
wgt::FrontFace::Ccw => glow::CW,
},
cull_face: match state.cull_mode {
Some(wgt::Face::Front) => glow::FRONT,
Some(wgt::Face::Back) => glow::BACK,
None => 0,
},
unclipped_depth: state.unclipped_depth,
polygon_mode: match state.polygon_mode {
wgt::PolygonMode::Fill => glow::FILL,
wgt::PolygonMode::Line => glow::LINE,
wgt::PolygonMode::Point => glow::POINT,
},
}
}
pub fn _map_view_dimension(dim: wgt::TextureViewDimension) -> u32 {
use wgt::TextureViewDimension as Tvd;
match dim {
Tvd::D1 | Tvd::D2 => glow::TEXTURE_2D,
Tvd::D2Array => glow::TEXTURE_2D_ARRAY,
Tvd::Cube => glow::TEXTURE_CUBE_MAP,
Tvd::CubeArray => glow::TEXTURE_CUBE_MAP_ARRAY,
Tvd::D3 => glow::TEXTURE_3D,
}
}
fn map_stencil_op(operation: wgt::StencilOperation) -> u32 {
use wgt::StencilOperation as So;
match operation {
So::Keep => glow::KEEP,
So::Zero => glow::ZERO,
So::Replace => glow::REPLACE,
So::Invert => glow::INVERT,
So::IncrementClamp => glow::INCR,
So::DecrementClamp => glow::DECR,
So::IncrementWrap => glow::INCR_WRAP,
So::DecrementWrap => glow::DECR_WRAP,
}
}
fn map_stencil_ops(face: &wgt::StencilFaceState) -> super::StencilOps {
super::StencilOps {
pass: map_stencil_op(face.pass_op),
fail: map_stencil_op(face.fail_op),
depth_fail: map_stencil_op(face.depth_fail_op),
}
}
pub(super) fn map_stencil(state: &wgt::StencilState) -> super::StencilState {
super::StencilState {
front: super::StencilSide {
function: map_compare_func(state.front.compare),
mask_read: state.read_mask,
mask_write: state.write_mask,
reference: 0,
ops: map_stencil_ops(&state.front),
},
back: super::StencilSide {
function: map_compare_func(state.back.compare),
mask_read: state.read_mask,
mask_write: state.write_mask,
reference: 0,
ops: map_stencil_ops(&state.back),
},
}
}
fn map_blend_factor(factor: wgt::BlendFactor) -> u32 {
use wgt::BlendFactor as Bf;
match factor {
Bf::Zero => glow::ZERO,
Bf::One => glow::ONE,
Bf::Src => glow::SRC_COLOR,
Bf::OneMinusSrc => glow::ONE_MINUS_SRC_COLOR,
Bf::Dst => glow::DST_COLOR,
Bf::OneMinusDst => glow::ONE_MINUS_DST_COLOR,
Bf::SrcAlpha => glow::SRC_ALPHA,
Bf::OneMinusSrcAlpha => glow::ONE_MINUS_SRC_ALPHA,
Bf::DstAlpha => glow::DST_ALPHA,
Bf::OneMinusDstAlpha => glow::ONE_MINUS_DST_ALPHA,
Bf::Constant => glow::CONSTANT_COLOR,
Bf::OneMinusConstant => glow::ONE_MINUS_CONSTANT_COLOR,
Bf::SrcAlphaSaturated => glow::SRC_ALPHA_SATURATE,
Bf::Src1 => glow::SRC1_COLOR,
Bf::OneMinusSrc1 => glow::ONE_MINUS_SRC1_COLOR,
Bf::Src1Alpha => glow::SRC1_ALPHA,
Bf::OneMinusSrc1Alpha => glow::ONE_MINUS_SRC1_ALPHA,
}
}
fn map_blend_component(component: &wgt::BlendComponent) -> super::BlendComponent {
super::BlendComponent {
src: map_blend_factor(component.src_factor),
dst: map_blend_factor(component.dst_factor),
equation: match component.operation {
wgt::BlendOperation::Add => glow::FUNC_ADD,
wgt::BlendOperation::Subtract => glow::FUNC_SUBTRACT,
wgt::BlendOperation::ReverseSubtract => glow::FUNC_REVERSE_SUBTRACT,
wgt::BlendOperation::Min => glow::MIN,
wgt::BlendOperation::Max => glow::MAX,
},
}
}
pub(super) fn map_blend(blend: &wgt::BlendState) -> super::BlendDesc {
super::BlendDesc {
color: map_blend_component(&blend.color),
alpha: map_blend_component(&blend.alpha),
}
}
pub(super) fn map_storage_access(access: wgt::StorageTextureAccess) -> u32 {
match access {
wgt::StorageTextureAccess::ReadOnly => glow::READ_ONLY,
wgt::StorageTextureAccess::WriteOnly => glow::WRITE_ONLY,
wgt::StorageTextureAccess::ReadWrite => glow::READ_WRITE,
}
}
pub(super) fn is_layered_target(target: u32) -> bool {
match target {
glow::TEXTURE_2D | glow::TEXTURE_CUBE_MAP => false,
glow::TEXTURE_2D_ARRAY | glow::TEXTURE_CUBE_MAP_ARRAY | glow::TEXTURE_3D => true,
_ => unreachable!(),
}
}